AU2023244064B2

AU2023244064B2 - Compressor and refrigeration device

Info

Publication number: AU2023244064B2
Application number: AU2023244064A
Authority: AU
Inventors: Tatsuya Katayama
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2022-03-28
Filing date: 2023-03-15
Publication date: 2026-04-02
Anticipated expiration: 2043-03-15
Also published as: US20250012281A1; EP4477888A4; JP7401799B2; EP4477888A1; JP2023144743A; CN118574994A; WO2023189582A1; AU2023244064A1

Abstract

A compressor (100) comprises: a casing (10) having a reservoir (16) in which oil is stored; an electric motor (20); a compression mechanism (40) positioned between the electric motor (20) and the reservoir (16); and a resonance-type muffler (50) formed in the compression mechanism (40). The muffler (50) has a cavity (51) having a resonance chamber (R) formed therein, and a first opening (53) that communicates with the resonance chamber (R) and is open in a refrigerant space (S). The opening (53) is formed in the bottom surface or outer peripheral surface of the compression mechanism (40).

Description

DESCRIPTION DESCRIPTION TITLE TITLE COMPRESSOR AND COMPRESSOR AND REFRIGERATION REFRIGERATION DEVICE DEVICE TECHNICALFIELD TECHNICAL FIELD

[0001]

The present disclosure relates to a compressor and a refrigeration apparatus. The present disclosure relates to a compressor and a refrigeration apparatus.

BACKGROUND ART BACKGROUND ART

[0002]

Patent Document Patent Document 1 1discloses disclosesa acompressor compressor having having a Helmholtz a Helmholtz muffler. muffler. The The

compressorofofPatent compressor PatentDocument Document 1 has 1 has a drive a drive shaft shaft extending extending in in thethe top-bottom top-bottom direction direction in in a a

casing, aa motor casing, attached to motor attached to an an upper portion of upper portion of the the drive drive shaft, shaft,and andaacompression mechanism compression mechanism

attached to a lower portion of the drive shaft. attached to a lower portion of the drive shaft.

[0003]

The Helmholtz The Helmholtz muffler muffler of of Patent Patent Document Document 11 has has aa resonance resonance chamber having an chamber having an

openingwhich opening whichisisopen openbetween betweenthethe compression compression mechanism mechanism and a and a rotor rotor of theofmotor. the motor. At least At least

part of an inner wall surface of the resonance chamber is formed by an outer peripheral surface part of an inner wall surface of the resonance chamber is formed by an outer peripheral surface

of the of the drive drive shaft. shaft.The The opening is formed opening is near the formed near the drive drive shaft, shaft, and and thus thus resonance with aa high resonance with high

frequency generated frequency generated nearnear the drive the drive shaft shaft in theincasing the casing can be can be reduced. reduced.

CITATION LIST CITATION LIST PATENT DOCUMENTS PATENT DOCUMENTS

[0004]

Patent Document 1: Japanese Unexamined Patent Publication No. 2014-118862 16 Feb 2026

SUMMARY

[0005]

5 The casing of the compressor has a bottom portion in which a reservoir for storing oil

is formed. In such a compressor, resonance is likely to be generated near an oil surface in the 2023244064

reservoir. Thus, noise is produced by this resonance.

[0006]

In addition, a frequency of that resonance decreases when the position of the oil surface

10 in the reservoir lowers. Thus, when the position of the oil surface in the reservoir lowers, noise

with a low frequency, which is not produced when the compressor is in a normal operation, is

produced.

[0006a]

It is an object of the present invention to substantially overcome, or at least ameliorate,

15 one or more of disadvantages of existing arrangements, or provide a useful alternative.

[0007]

Some embodiments of the present disclosure are intended to reduce noise of a

compressor produced by resonance in a casing.

[0007a]

20 According to one aspect of the present invention, there is provided a compressor

including: a casing having a bottom portion in which a reservoir configured to store oil is

provided; an electric motor housed in the casing; a compression mechanism disposed between

the electric motor and the reservoir and configured to compress sucked gas refrigerant and

discharge the compressed gas refrigerant into the casing; and a resonance muffler provided in

25 the compression mechanism, wherein in the casing, a refrigerant space through which the gas refrigerant discharged from the compression mechanism flows is formed above the reservoir, 16 Feb 2026 the muffler includes a cavity in which a resonance chamber is formed, and a first opening communicating with the resonance chamber and opening to the refrigerant space, and the first opening is formed on a lower surface of the compression mechanism or on an outer peripheral

5 surface of the compression mechanism.

[0007b] 2023244064

According to another aspect of the present invention, there is provided a refrigeration

apparatus including: the compressor of any the above aspect.

[0008]

10 A first aspect is directed to a compressor including: a casing (10) having a bottom

portion in which a reservoir (16) configured to store oil is provided; an electric motor (20)

housed in the casing (10); a compression mechanism (40) disposed between the electric motor

(20) and the reservoir (16) and configured to compress sucked gas refrigerant and discharge the

compressed gas refrigerant into the casing (10); and a resonance muffler (50) provided in the

15 compression mechanism (40), wherein in the casing (10), a refrigerant space (S) through which

2a the gas the gas refrigerant refrigerantdischarged dischargedfrom from the thecompression mechanism compression mechanism (40) (40) flows flows isisformed formed above above thethe reservoir (16), reservoir (16), the the muffler muffler (50) (50) includes includes aa cavity cavity (51) (51) in in which whicha aresonance resonancechamber chamber (R) (R) is is formed, and formed, andaafirst first opening (53) communicating opening (53) communicating with with thethe resonance resonance chamber chamber (R) opening (R) and and opening to the refrigerant space (S), and the first opening (53) is formed on a lower surface or an outer to the refrigerant space (S), and the first opening (53) is formed on a lower surface or an outer peripheral surface peripheral surface of of the the compression mechanism compression mechanism (40). (40).

[0009]

In the first aspect, the first opening (53) of the resonance muffler (50) is formed on a In the first aspect, the first opening (53) of the resonance muffler (50) is formed on a

lower surface lower surface or or an an outer outer peripheral peripheral surface surfaceof ofthe thecompression compression mechanism nearananoil mechanism near oilsurface, surface,

and thus noise of the compressor (100) produced by resonance in the casing (10) can be reduced. and thus noise of the compressor (100) produced by resonance in the casing (10) can be reduced.

[0010]

A second aspect is an embodiment of the first aspect. In the second aspect, the muffler A second aspect is an embodiment of the first aspect. In the second aspect, the muffler

(50) further (50) further includes includes a a first firstcommunication passage(52) communication passage (52)communicating communicating with with the resonance the resonance

chamber(R), chamber (R),and andthe thefirst first opening (53) is opening (53) is formed at an formed at an end end portion portion of of the the first firstcommunication communication

passage (52). passage (52).

[0011]

In the In the second aspect, the second aspect, the first first opening (53) is opening (53) is formed onananend formed on endportion portionofofthethefirst first

communication communication passage passage (52), (52), andand thus thus theposition the positionofofthe thefirst first opening (53) can opening (53) can be be adjusted adjusted by by

the first the firstcommunication passage(52). communication passage (52).

[0012]

A third aspect is an embodiment of the first or second aspect. In the third aspect, the A third aspect is an embodiment of the first or second aspect. In the third aspect, the

compressionmechanism compression mechanism (40) (40) has ahas a plurality plurality of members of members overlapping overlapping with with each eachtheother, other, the

plurality of members includes a first member (E1), the first member (E1) includes a recess (61, plurality of members includes a first member (E1), the first member (E1) includes a recess (61,

62) formed 62) formedatat an anend endsurface surfaceofofthe thefirst first member (E1)inina adirection member (E1) directioninin which whichthe theplurality plurality of of

membersoverlap members overlap with with each each other, other, andand an an internalspace internal space of of therecess the recess(61, (61,62) 62)constitutes constitutespart part

of the cavity (51). of the cavity (51).

3

[0013]

In the third aspect, part of the cavity (51) is constituted by the internal space of the In the third aspect, part of the cavity (51) is constituted by the internal space of the

recess (61, recess (61, 62), 62), and thus the and thus the cavity cavity (51) (51) can canbebeformed formedin in thefirst the firstmember member (E1) (E1) by simple by simple

processing. processing.

[0014]

A fourth aspect is an embodiment of any one of the first to third aspects. In the fourth A fourth aspect is an embodiment of any one of the first to third aspects. In the fourth

aspect, the aspect, thecompression mechanism compression mechanism (40)has (40) hasa aplurality plurality of of members overlappingwith members overlapping witheach eachother, other,

the plurality the plurality of ofmembers includesaa second members includes secondmember member (E2), (E2), thethe second second member member (E2) includes (E2) includes a a

through hole through hole (63) (63) penetrating penetrating the the second secondmember member (E2) (E2) in in a direction a direction inin which which thethe pluralityofof plurality

members overlap with each other, and an internal space of the through hole (63) constitutes part members overlap with each other, and an internal space of the through hole (63) constitutes part

of the cavity (51). of the cavity (51).

[0015]

In the fourth aspect, part of the cavity (51) is constituted by the internal space of the In the fourth aspect, part of the cavity (51) is constituted by the internal space of the

through hole through hole (63), (63), and and thus thus the the cavity cavity(51) (51)can canbe beformed formed in inthe thesecond second member (E2)bybysimple member (E2) simple

processing. processing.

[0016]

A fifth aspect is an embodiment of any one of the first to fourth aspects. In the fifth A fifth aspect is an embodiment of any one of the first to fourth aspects. In the fifth

aspect, the aspect, the compression mechanism compression mechanism (40) (40) includes includes a cylinder a cylinder (41), (41), a a first closing first closing member member (45) (45)

configured configured toto cover cover an an opening opening surface surface of oneof one end of end of the cylinder the cylinder (41) (41) in an in an axial axial direction, direction, and and

a second a closing member second closing member (46) (46) configured configured to cover to cover an opening an opening surface surface on another on another end end of theof the

cylinder (41) in the axial direction, and the cavity (51) is formed by at least one of the cylinder cylinder (41) in the axial direction, and the cavity (51) is formed by at least one of the cylinder

(41), the (41), the first firstclosing member closing member (45), (45),or orthe thesecond secondclosing closingmember (46). member (46).

[0017]

In the fifth aspect, the cavity (51) is formed by at least one of the cylinder (41), the In the fifth aspect, the cavity (51) is formed by at least one of the cylinder (41), the

first closing first closingmember (45), or member (45), or the the second closing member second closing member (46) (46) thatconstitute that constitutethe thecompression compression

4 mechanism mechanism (40),and (40), andthus thusthe thecavity cavity(51) (51)can canbebeformed formedwithout without additionalmembers. additional members.

[0018]

A sixth aspect is an embodiment of any one of the first to fifth aspects. In the sixth A sixth aspect is an embodiment of any one of the first to fifth aspects. In the sixth

aspect, the aspect, the muffler muffler (50) (50) further furtherincludes includes aasecond second opening (55) which opening (55) whichcommunicates communicateswithwith the the

cavity (51) cavity (51) and and through whichthe through which theoil oil flows flows in in and and out, out, and the second and the opening(55) second opening (55)isis formed formed

below the first opening (53). below the first opening (53).

[0019]

In the sixth aspect, the second opening (55) through which the oil flows in and out is In the sixth aspect, the second opening (55) through which the oil flows in and out is

formed below the first opening (53), and thus when the oil level in the reservoir (16) rises, the formed below the first opening (53), and thus when the oil level in the reservoir (16) rises, the

oil flows oil into the flows into the cavity cavity (51) (51) through the second through the secondopening opening (55).When (55). When the the oil oil flows flows intointo the the

cavity (51), the bottom surface of the resonance chamber (R) is constituted by the oil surface, cavity (51), the bottom surface of the resonance chamber (R) is constituted by the oil surface,

and the and the volume ofthe volume of the resonance resonancechamber chamber (R) (R) decreases.Accordingly, decreases. Accordingly, thethe resonance resonance frequency frequency

of the muffler (50) increases. In contrast, when the oil level in the reservoir (16) lowers, the oil of the muffler (50) increases. In contrast, when the oil level in the reservoir (16) lowers, the oil

in the in the cavity cavity (51) (51)flows flows out outthrough through the the second second opening (55), and opening (55), the volume and the ofthe volume of the resonance resonance

chamber(R) chamber (R)increases. increases. When Whenthe thevolume volumeof of theresonance the resonance chamber chamber (R)(R) increases, increases, thetheresonance resonance

frequency of the frequency of the muffler muffler(50) (50)decreases. decreases.InInthis this manner, manner,bybythe theoil oil flowing flowingininand andout outofofthe the

cavity (51) cavity (51) through throughthe thesecond second opening opening (55), (55), the the resonance resonance frequency frequency of theofmuffler the muffler (50) (50)

changes, and changes, andthus thus noise noise with withaa wide widerange rangeofofresonance resonancefrequency frequency cancan be be reduced reduced by aby a single single

muffler (50). muffler (50).

[0020]

A seventh aspect is an embodiment of the sixth aspect. In the seventh aspect, the first A seventh aspect is an embodiment of the sixth aspect. In the seventh aspect, the first

opening (53) is formed below an initial supply position (A1) which is a position of an oil surface opening (53) is formed below an initial supply position (A1) which is a position of an oil surface

in the reservoir (16) reached at a time of shipment, and communicates with the refrigerant space in the reservoir (16) reached at a time of shipment, and communicates with the refrigerant space

(S) when an oil level in the reservoir (16) lowers. (S) when an oil level in the reservoir (16) lowers.

[0021]

5

In the seventh aspect, the first opening (53) is formed below an initial supply position In the seventh aspect, the first opening (53) is formed below an initial supply position

(A1) which is a position of a oil surface reached at the time of shipment, and thus when the oil (A1) which is a position of a oil surface reached at the time of shipment, and thus when the oil

surface is at the initial supply position (A1), the oil flows into the cavity (51) of the muffler (50) surface is at the initial supply position (A1), the oil flows into the cavity (51) of the muffler (50)

through the first opening (53). Then, when the position of the oil surface in the reservoir (16) through the first opening (53). Then, when the position of the oil surface in the reservoir (16)

lowers as lowers as the the compressor compressoroperates, operates,the thefirst first opening opening(53) (53)communicates communicateswithwith the refrigerant the refrigerant

space (S), space (S), whereby the cavity whereby the cavity (51) (51) of of the the muffler muffler (50) (50) communicates withthe communicates with therefrigerant refrigerant space space

(S) and (S) the muffler and the (50) serves muffler (50) serves aa silencing silencing function. function. Accordingly, Accordingly, noise noise with with aa low low frequency frequency

that is produced as the oil level in the reservoir (16) lowers can be reduced. that is produced as the oil level in the reservoir (16) lowers can be reduced.

[0022]

An eighth aspect is an embodiment of the sixth aspect. In the eighth aspect, the muffler An eighth aspect is an embodiment of the sixth aspect. In the eighth aspect, the muffler

(50) further (50) furtherincludes includesa asecond secondcommunication passage(54) communication passage (54)communicating communicating with with thethe cavity cavity (51), (51),

and the and the second opening(55) second opening (55)isis formed formedatat an an end endportion portionof of the the second secondcommunication communication passage passage

(54). (54).

[0023]

In the eighth aspect, the second opening (55) is formed at an end portion of the second In the eighth aspect, the second opening (55) is formed at an end portion of the second

communication communication passage passage (54), (54), thetheposition positionofofthe thesecond secondopening openingcancan bebe adjustedbyby adjusted thesecond the second

communication communication passage passage (54). (54). Accordingly, Accordingly, the the level level at at which which the the oiloil flows flows in in andand outout cancan be be

adjusted, and adjusted, and thus thus the the volume of the volume of the resonance chamber(R) resonance chamber (R)can canbebeadjusted. adjusted.

[0024]

A ninth A ninthaspect aspectis isan an embodiment embodiment of theof the aspect. sixth sixth aspect. In theaspect, In the ninth ninth the aspect, the

plurality ofofmembers plurality includes aa third members includes third member (E3)which member (E3) whichisisa alowermost lowermost one one of of theplurality the pluralityof of

members,the members, thecavity cavity(51) (51)isis formed formedininthe thethird third member member (E3), (E3), andand thethe second second opening opening (55)(55) is is

formedononaalower formed lowersurface surfaceofofthe the third third member (E3). member (E3).

[0025]

6

In the ninth aspect, the second opening (55) is formed on a lower surface of the third In the ninth aspect, the second opening (55) is formed on a lower surface of the third

member(E3). member (E3). The Thesecond secondopening opening(55) (55)isis formed formedwhen whenthethecavity cavity(51) (51) is is formed formed in in the the

compressionmechanism compression mechanism (40). (40). Accordingly, Accordingly, the the second second opening opening (55) (55) can can be formed be formed easily. easily.

[0026]

A tenth aspect is an embodiment of any one of the first to ninth aspects. In the tenth A tenth aspect is an embodiment of any one of the first to ninth aspects. In the tenth

aspect, the aspect, the muffler (50) includes muffler (50) includes aa first first muffler (50a) and muffler (50a) andaasecond secondmuffler muffler (50b), (50b), thethe first first

opening(53) opening (53)ofofthe thefirst first muffler (50a) is muffler (50a) is formed belowthethefirst formed below first opening opening(53) (53)ofofthe thesecond second

muffler (50b), muffler (50b), and and aa resonance resonancefrequency frequencyofofthe thefirst first muffler muffler (50a) (50a) is is lower lower than than aa resonance resonance

frequencyof frequency of the the second muffler(50b). second muffler (50b).

[0027]

In the compressor (100), when the oil level in the reservoir (16) is low, the resonance In the compressor (100), when the oil level in the reservoir (16) is low, the resonance

frequency frequency in in the the casing casing (10)(10) is low. is low. In contrast, In contrast, when when the oilthe oil inlevel level the in the reservoir reservoir (16) is high, (16) is high,

the resonance frequency in the casing (10) is high. In the tenth aspect, the first opening (53) of the resonance frequency in the casing (10) is high. In the tenth aspect, the first opening (53) of

the first muffler (50a) is formed below the first opening (53) of the second muffler (50b), and the first muffler (50a) is formed below the first opening (53) of the second muffler (50b), and

the resonance frequency of the first muffler (50a) is lower than the resonance frequency of the the resonance frequency of the first muffler (50a) is lower than the resonance frequency of the

second muffler (50b). Thus, when the oil level in the reservoir (16) is low, noise in the casing second muffler (50b). Thus, when the oil level in the reservoir (16) is low, noise in the casing

(10) can be reduced by the first muffler (50a). In contrast, when the oil level in the reservoir (10) can be reduced by the first muffler (50a). In contrast, when the oil level in the reservoir

(16) is high, (16) is high, noise noiseininthe thecasing casing (10) (10) cancan be reduced be reduced by theby the second second muffler (50b). muffler (50b).

[0028]

Aneleventh An eleventhaspect aspectisisdirected directed to to aa refrigeration refrigeration apparatus including the apparatus including the compressor compressor

(100) ofany (100) of anyoneone of of thethe first first to to tenth tenth aspects. aspects.

[0029]

In the In the eleventh eleventh aspect, aspect, the thecompressor compressor (100) (100) including the resonance including the muffler (50) resonance muffler (50) can can

be applied to the refrigeration apparatus (1). be applied to the refrigeration apparatus (1).

7

BRIEF DESCRIPTION BRIEF DESCRIPTION OF OF THE THE DRAWINGS DRAWINGS

[0030]

FIG. 11 is FIG. is aa schematic piping system schematic piping systemdiagram diagramof of a refrigerationapparatus a refrigeration apparatusincluding includinga a

compressoraccording compressor accordingtotoa afirst first embodiment. embodiment.

FIG. 2 is a longitudinal sectional view illustrating the schematic configuration of the FIG. 2 is a longitudinal sectional view illustrating the schematic configuration of the

compressor. compressor.

FIG. 3 is an enlarged sectional view of a periphery of a muffler. FIG. 3 is an enlarged sectional view of a periphery of a muffler.

FIG. 44 corresponds FIG. correspondstoto FIG. FIG.33and andshows showsa asecond second variationofofthe variation thefirst first embodiment. embodiment.

FIG. 55 corresponds FIG. correspondstoto FIG. FIG.33and andshows showsa asecond second embodiment. embodiment.

FIG. 66 corresponds FIG. correspondstoto FIG. FIG.33and andshows showsa afirst first variation variation of of the thesecond second embodiment. embodiment.

FIG. 77 corresponds FIG. correspondstoto FIG. FIG.33and andshows showsa athird thirdembodiment. embodiment.

FIG. 88 corresponds FIG. correspondstoto FIG. FIG.33and andshows showsa asecond second variationofofthe variation thethird third embodiment. embodiment.

FIG. 99 is FIG. is an an enlarged enlarged sectional sectionalview viewof ofa aperiphery peripheryofof a compression a compressionmechanism where mechanism where

an oil level is low according to a fourth embodiment. an oil level is low according to a fourth embodiment.

FIG. 10 FIG. 10 corresponds correspondstotoFIG. FIG.9 9and andshows shows a case a case where where thethe oiloil levelisishigh level highaccording according

to the to the fourth fourth embodiment. embodiment.

FIG. 11 FIG. 11corresponds correspondstotoFIG. FIG.3 3and andshows shows another another embodiment. embodiment.

DESCRIPTION OF DESCRIPTION OF EMBODIMENTS EMBODIMENTS

[0031]

Embodiments of the present disclosure will be described in detail below with reference Embodiments of the present disclosure will be described in detail below with reference

to the to the drawings. Thepresent drawings. The presentdisclosure disclosureisis not not limited limited to to the the embodiments shown embodiments shown below, below, and and

various changes various changescan canbebemade madewithin withinthethescope scope without without departing departing from from thethe technical technical concept concept of of

the present the present disclosure. disclosure. Each Eachofofthe thedrawings drawingsis is intended intended to to illustratethe illustrate thepresent presentdisclosure disclosure

conceptually, and conceptually, and dimensions, ratios, orornumbers dimensions, ratios, numbers may beexaggerated may be exaggeratedororsimplified simplified as as necessary necessary

8 for the sake of ease of understanding. for the sake of ease of understanding.

[0032]

<<First Embodiment>> <<First Embodiment>

A compressor A compressor(100) (100)ofofa afirst first embodiment willbebedescribed. embodiment will described.

[0033]

(1) (1) Overview ofRefrigeration Overview of RefrigerationApparatus Apparatus

Thecompressor The compressor(100) (100)ofofthis thisembodiment embodimentis is provided provided in in a refrigerationapparatus a refrigeration apparatus(1). (1).

As illustrated in FIG. 1, the refrigeration apparatus (1) has a refrigerant circuit (1a) filled with As illustrated in FIG. 1, the refrigeration apparatus (1) has a refrigerant circuit (la) filled with

refrigerant. The refrigerant. refrigerantcircuit The refrigerant circuit(1a) (1a)hashas the the compressor compressor (100), (100), a radiator a radiator (3), a (3), a

decompressionmechanism decompression mechanism (4),(4), andand an an evaporator evaporator (5).(5). TheThe decompression decompression mechanism mechanism (4) is (4) an is an

expansion valve. The refrigerant circuit (1a) performs a vapor compression refrigeration cycle. expansion valve. The refrigerant circuit (la) performs a vapor compression refrigeration cycle.

[0034]

In the In the refrigeration refrigeration cycle, cycle, the therefrigerant refrigerantcompressed compressed by compressor by the the compressor (100) (100)

dissipates heat to air in the radiator (3). The refrigerant having dissipated heat is decompressed dissipates heat to air in the radiator (3). The refrigerant having dissipated heat is decompressed

by the by the decompression decompression mechanism mechanism (4) evaporates (4) and and evaporates in theinevaporator the evaporator (5).evaporated (5). The The evaporated

refrigerant is sucked into the compressor (100). refrigerant is sucked into the compressor (100).

[0035]

Therefrigeration The refrigeration apparatus apparatus(1) (1) isis an an air air conditioner. conditioner. The Theair air conditioner conditionermay maybe be a a

cooling apparatus, cooling apparatus, aa heating heating apparatus, apparatus, or or an an air air conditioner switchable between conditioner switchable betweencooling coolingandand

heating. In heating. In this thiscase, case,the theair conditioner air hashasa switching conditioner mechanism a switching (e.g., four-way mechanism (e.g., four-way switching switching

valve) that switches the direction of circulation of the refrigerant. The refrigeration apparatus valve) that switches the direction of circulation of the refrigerant. The refrigeration apparatus

(1) may be a water heater, a chiller unit, or a cooling apparatus that cools air in an internal space. (1) may be a water heater, a chiller unit, or a cooling apparatus that cools air in an internal space.

The cooling apparatus cools air in a refrigerator, a freezer, or a container, for example. The cooling apparatus cools air in a refrigerator, a freezer, or a container, for example.

[0036]

(2) Compressor (2) Compressor

9

As illustrated As illustrated in in FIG. FIG. 2,2, the thecompressor compressor (100) (100) of this of this embodiment embodiment is a hermetic is a hermetic

compressor.The compressor. Thecompressor compressor (100) (100) is is a a one-cylinder one-cylinder rotarycompressor. rotary compressor. TheThe compressor compressor (100) (100)

sucks aa low-pressure sucks gas refrigerant low-pressure gas refrigerantand and compresses the sucked compresses the gas refrigerant. sucked gas refrigerant.The Thecompressor compressor

(100) discharges (100) discharges the the compressed high-pressuregas compressed high-pressure gasrefrigerant. refrigerant.

[0037]

The compressor (100) includes a casing (10), an electric motor (20), a drive shaft (30), The compressor (100) includes a casing (10), an electric motor (20), a drive shaft (30),

and aa compression and compressionmechanism mechanism (40). (40). The The casing casing (10)(10) houses houses the electric the electric motor motor (20), (20), the the drive drive

shaft (30), shaft (30),and and the thecompression mechanism compression mechanism (40). (40).

[0038]

(2–1) Casing (2-1) Casing

Thecasing The casing(10) (10)isis aa hermetically-closed hermetically-closedcontainer containerstanding standingupright uprightand andformed formed in in a a

cylindrical shape. The casing (10) includes a barrel (11), an upper end plate (12), and a lower cylindrical shape. The casing (10) includes a barrel (11), an upper end plate (12), and a lower

end plate (13). The barrel (11) has a cylindrical shape. The upper end plate (12) closes the upper end plate (13). The barrel (11) has a cylindrical shape. The upper end plate (12) closes the upper

end of the barrel (11). The lower end plate (13) closes the lower end of the barrel (11). end of the barrel (11). The lower end plate (13) closes the lower end of the barrel (11).

[0039]

A suction pipe (14) is attached to a lower portion of the barrel (11). The suction pipe A suction pipe (14) is attached to a lower portion of the barrel (11). The suction pipe

(14) passes (14) passes through throughthe thebarrel barrel (11) (11) ofof the the casing casing(10), (10),and andisisconnected connectedtotothethecompression compression

mechanism mechanism (40).A A (40). discharge discharge pipe pipe (15) (15) is is attachedtotothe attached theupper upperendend plate(12). plate (12).The The discharge discharge

pipe (15) passes through the top of the casing (10), and is open to the inside of the casing (10). pipe (15) passes through the top of the casing (10), and is open to the inside of the casing (10).

[0040]

A reservoir A reservoir (16) (16) for for storing storing oil oil for for lubricating lubricating sliding sliding portions of the portions of the compression compression

mechanism (40) etc. is formed in the bottom part of the casing (10). mechanism (40) etc. is formed in the bottom part of the casing (10).

[0041]

A refrigerant A refrigerant space (S) through space (S) through which which a agas gasrefrigerant refrigerant discharged discharged from fromthe the

compressionmechanism compression mechanism(40)(40) flows flows is formed is formed inside inside the the casing casing (10). (10). TheThe refrigerant refrigerant space space (S)(S)

10 is is formed above formed above the the reservoir reservoir (16) (16) in casing in the the casing (10). (10). In other In other words, words, thesurface the bottom bottomfacing surface facing the refrigerant space (S) is an oil surface of the reservoir (16). the refrigerant space (S) is an oil surface of the reservoir (16).

[0042]

(2–2) Electric (2-2) Electric Motor Motor

The electric motor (20) is disposed at an upper portion in the casing (10). The electric The electric motor (20) is disposed at an upper portion in the casing (10). The electric

motor (20) includes a stator (21) and a rotor (22). The stator (21) is fixed to the barrel (11) of motor (20) includes a stator (21) and a rotor (22). The stator (21) is fixed to the barrel (11) of

the casing. The drive shaft (30) is inserted into the rotor (22). the casing. The drive shaft (30) is inserted into the rotor (22).

[0043]

(2–3) Drive Shaft (2-3) Drive Shaft

Thedrive The driveshaft shaft (30) (30) extends extendsininthe theaxial axial direction direction (the (the top-bottom top-bottomdirection) direction)ofof the the

casing (10) from an upper portion of the barrel (11) of the casing (10) to the bottom portion of casing (10) from an upper portion of the barrel (11) of the casing (10) to the bottom portion of

the casing (10). The drive shaft (30) is rotated by the electric motor (20). The drive shaft (30) the casing (10). The drive shaft (30) is rotated by the electric motor (20). The drive shaft (30)

has a main shaft portion (31), a secondary shaft portion (32), and an eccentric portion (33). In has a main shaft portion (31), a secondary shaft portion (32), and an eccentric portion (33). In

the drive shaft (30), the main shaft portion (31), the eccentric portion (33), and the secondary the drive shaft (30), the main shaft portion (31), the eccentric portion (33), and the secondary

shaft portion (32) are arranged in sequence from top to bottom. In the drive shaft (30), the main shaft portion (32) are arranged in sequence from top to bottom. In the drive shaft (30), the main

shaft portion (31), the eccentric portion (33), and the secondary shaft portion (32) are integrated shaft portion (31), the eccentric portion (33), and the secondary shaft portion (32) are integrated

with each other. with each other.

[0044]

Themain The mainshaft shaftportion portion(31) (31) and andthe thesecondary secondaryshaft shaftportion portion(32) (32)each eachhave havea acircular circular

columnarshape. columnar shape.The Themain main shaftportion shaft portion(31) (31)and andthe thesecondary secondary shaftportion shaft portion(32) (32)are arearranged arranged

coaxially with coaxially with each eachother. other. The Therotor rotor(22) (22)ofofthe theelectric electric motor motor(20) (20)isisattached attachedtotoananupper upper

portion of the main shaft portion (31). A lower portion of the main shaft portion (31) is inserted portion of the main shaft portion (31). A lower portion of the main shaft portion (31) is inserted

into a front head (45) described later. The secondary shaft portion (32) is inserted into a rear into a front head (45) described later. The secondary shaft portion (32) is inserted into a rear

head (46) described later. The drive shaft (30) is configured so that the main shaft portion (31) head (46) described later. The drive shaft (30) is configured SO that the main shaft portion (31)

is rotatably supported by the front head (45) and the secondary shaft portion (32) is rotatably is rotatably supported by the front head (45) and the secondary shaft portion (32) is rotatably

11 supported by the rear head (46). supported by the rear head (46).

[0045]

Theeccentric The eccentric portion portion (33) (33) has has aa circular circular columnar shape.The columnar shape. Theeccentric eccentricportion portion(33) (33)

has a larger diameter than those of the main shaft portion (31) and the secondary shaft portion has a larger diameter than those of the main shaft portion (31) and the secondary shaft portion

(32). Thecenter (32). The centeraxis axis of of thethe eccentric eccentric portion portion (33) (33) is parallel is parallel with with the the center center axis of axis of rotation rotation of of

the main shaft portion (31) and the secondary shaft portion (32). The center axis of the eccentric the main shaft portion (31) and the secondary shaft portion (32). The center axis of the eccentric

portion (33) portion (33) is is eccentric eccentric with with respect respect to to the the main shaft portion main shaft portion (31) (31) and andthe the secondary secondaryshaft shaft

portion (32). The eccentric portion (33) is inserted into a piston (44). The eccentric portion (33) portion (32). The eccentric portion (33) is inserted into a piston (44). The eccentric portion (33)

supports the piston (44). supports the piston (44).

[0046]

A centrifugal A centrifugal pump pump(34) (34)isisprovided providedatatthe thelower lowerendend of of thesecondary the secondary shaft shaft portion portion

(32). The (32). centrifugal pump The centrifugal (34)isis immersed pump (34) immersedininthe thereservoir reservoir(16). (16). An Anoil oil supply supplypassage passage(not (not

shown) is formed in the drive shaft (30). When the drive shaft (30) rotates, the oil in the reservoir shown) is formed in the drive shaft (30). When the drive shaft (30) rotates, the oil in the reservoir

(16) is supplied (16) is suppliedtotoa abearing bearingof of thethe drive drive shaft shaft (30)(30) andsliding and the the sliding portions portions of the compression of the compression

mechanism mechanism (40)through (40) through thethe oilsupply oil supplypassage. passage.

[0047]

(2–4) (2-4) Compression Compression Mechanism Mechanism

Thecompression The compression mechanism mechanism (40)(40) is aisso-called a so-called oscillating-pistonrotary oscillating-piston rotarycompression compression

mechanism.The mechanism. The compression compression mechanism mechanism (40) (40) is is driven driven byelectric by the the electric motor motor (20) (20) through through the the

drive shaft drive shaft (30). (30).The The compression mechanism compression mechanism (40) (40) is is disposed disposed between between the the electricmotor electric motor (20) (20)

and the and the reservoir reservoir (16) (16) in in the the casing casing (10). (10). In Inother otherwords, words, the the compression mechanism compression mechanism (40) (40) is is

disposed below the electric motor (20). disposed below the electric motor (20).

[0048]

Thecompression The compression mechanism mechanism (40) (40) hasfront has one one front head (45), head (45), onehead one rear rear(46), head one (46), one

cylinder (41), and one piston (44). In the compression mechanism (40), the front head (45), the cylinder (41), and one piston (44). In the compression mechanism (40), the front head (45), the

12 cylinder (41), cylinder (41), and the rear and the rear head head(46) (46)are arearranged arrangedininsequence sequence from from top top to bottom to bottom SO assotoas to overlap with each overlap with eachother. other. InIn other otherwords, words,ininthe thecompression compression mechanism mechanism (40), (40), a plurality a plurality of of membersisisarranged members arrangedSOsoasastotooverlap overlapwith witheach each other.The other. The fronthead front head (45),thethecylinder (45), cylinder(41), (41), and the and the rear rear head head(46) (46)are arefastened fastenedtotoeach each other other by by a plurality a plurality of of bolts bolts (not (not shown). shown). The The compression mechanism compression mechanism (40)(40) is fixed is fixed to to thecasing the casing(10) (10)bybythe thecylinder cylinder(41) (41)being beingfixed fixedtoto the the inner peripheral surface of the barrel (11) through a mounting plate (not shown). inner peripheral surface of the barrel (11) through a mounting plate (not shown).

[0049]

(2–4–1) Cylinderand (2-4-1) Cylinder andPiston Piston

The cylinder (41) has a thick disk shape. The cylinder (41) is disposed concentrically The cylinder (41) has a thick disk shape. The cylinder (41) is disposed concentrically

with the barrel (11) of the casing (10). A cylinder bore (42) is formed in a center portion of the with the barrel (11) of the casing (10). A cylinder bore (42) is formed in a center portion of the

cylinder (41). The piston (44) is disposed in the cylinder bore (42). The piston (44) has a thick cylinder (41). The piston (44) is disposed in the cylinder bore (42). The piston (44) has a thick

cylindrical shape. The eccentric portion (33) of the drive shaft (30) is inserted into the piston cylindrical shape. The eccentric portion (33) of the drive shaft (30) is inserted into the piston

(44). (44).

[0050]

In the In the compression mechanism compression mechanism (40), (40), a compression a compression chamber chamber (C) is(C) is formed formed betweenbetween

the wall surface of the cylinder bore (42) and the outer peripheral surface of the piston (44). the wall surface of the cylinder bore (42) and the outer peripheral surface of the piston (44).

The compression The compression mechanism mechanism(40) (40)isisprovided providedwith witha ablade bladepartitioning partitioning the the compression compression

chamber(C) chamber (C)into intoaa high-pressure high-pressurechamber chamber and and a low-pressure a low-pressure chamber. chamber.

[0051]

The cylinder (41) has a suction port (43). The suction port (43) extends in the radially The cylinder (41) has a suction port (43). The suction port (43) extends in the radially

outwarddirection outward direction of of the the cylinder cylinder from fromthe the wall wall surface surface of of the the cylinder cylinder bore bore (42). (42). The suction The suction

port (43) is a hole having a circular section. The suction port (43) communicates with the low- port (43) is a hole having a circular section. The suction port (43) communicates with the low-

pressure chamber pressure chamberofofthe thecompression compression chamber chamber (C). (C). The The suction suction port port (43) (43) opensopens on theonouter the outer

surface of the cylinder (41). The suction pipe (14) is inserted into the suction port (43). surface of the cylinder (41). The suction pipe (14) is inserted into the suction port (43).

[0052]

13

(2–4–2) Front (2-4-2) FrontHead Headand andRear Rear Head Head

Thefront The front head head(45) (45)is is aa member memberthat thatcovers coversthe theopening opening surface surface of of theupper the upper endend of of

the cylinder (41) (one end of the cylinder (41) in the axial direction). The front head (45) has a the cylinder (41) (one end of the cylinder (41) in the axial direction). The front head (45) has a

first end plate portion (45a) and a first boss portion (45b). The first end plate portion (45a) has first end plate portion (45a) and a first boss portion (45b). The first end plate portion (45a) has

a disk shape. The first end plate portion (45a) is disposed so as to face the electric motor (20) a disk shape. The first end plate portion (45a) is disposed SO as to face the electric motor (20)

in the axial direction. The first boss portion (45b) has a cylindrical shape. The first boss portion in the axial direction. The first boss portion (45b) has a cylindrical shape. The first boss portion

(45b) extends (45b) extends upward upward(toward (toward thethe electricmotor electric motor (20)) (20)) from from the the firstendend first plate plate portion portion (45a) (45a)

along the outer peripheral surface of the drive shaft (30). A circular hole is formed in a center along the outer peripheral surface of the drive shaft (30). A circular hole is formed in a center

portion of the front head (45). In the hole of the front head (45), the main shaft portion (31) of portion of the front head (45). In the hole of the front head (45), the main shaft portion (31) of

the drive the drive shaft shaft (30) (30)isisdisposed disposedwith withaasliding bearing sliding bearingsandwiched sandwiched between the front between the front head head (45) (45)

and the main shaft portion (31). and the main shaft portion (31).

[0053]

The rear head (46) is a member that covers the opening surface of the lower end of the The rear head (46) is a member that covers the opening surface of the lower end of the

cylinder (41) (the other end of the cylinder (41) in the axial direction). The rear head (46) has a cylinder (41) (the other end of the cylinder (41) in the axial direction). The rear head (46) has a

secondend second endplate plate portion portion (46a) (46a) and andaasecond secondboss bossportion portion(46b). (46b).The Thesecond second endend plate plate portion portion

(46a) has a disk shape. The second end plate portion (46a) is disposed so as to face the first end (46a) has a disk shape. The second end plate portion (46a) is disposed SO as to face the first end

plate portion (45a) in the axial direction. The second boss portion (46b) has a cylindrical shape. plate portion (45a) in the axial direction. The second boss portion (46b) has a cylindrical shape.

Thesecond The secondboss bossportion portion(46b) (46b)extends extendsdownward downward from from thethe second second endend plate plate portion portion (46a) (46a) along along

the outer peripheral surface of the drive shaft (30). A circular hole is formed in a center portion the outer peripheral surface of the drive shaft (30). A circular hole is formed in a center portion

of the rear head (46). In the hole of the rear head (46), the secondary shaft portion (32) of the of the rear head (46). In the hole of the rear head (46), the secondary shaft portion (32) of the

drive shaft drive shaft (30) (30) is isdisposed disposed with with aa sliding slidingbearing bearingsandwiched betweenthe sandwiched between therear rearhead head(46) (46)and and

the secondary shaft portion (32). the secondary shaft portion (32).

[0054]

In this In this embodiment, thefront embodiment, the front head head(45) (45)corresponds correspondstotoa afirst first closing closing member memberofofthethe

present disclosure, and the rear head (46) corresponds to a second closing member of the present present disclosure, and the rear head (46) corresponds to a second closing member of the present

14 disclosure. disclosure.

[0055]

A discharge A dischargepassage passage(not (notshown) shown)is is formed formed in in thethe firstend first endplate plateportion portion(45a) (45a)ofofthe the

front head front head (45). (45). The The discharge passage is discharge passage is aa passage passage for for discharging discharging the the refrigerant refrigerantcompressed compressed

in the in the compression chamber compression chamber (C) (C) ofof thecylinder the cylinder(41) (41)totoaa space spacepresent present above abovethe thecompression compression

mechanism mechanism (40).The (40). The discharge discharge passage passage communicates communicates withhigh-pressure with the the high-pressure chamber chamber of the of the

compressionchamber compression chamber (C). (C). A cover A cover member member (47)provided (47) is is provided on an on an upper upper portion portion of theof the front front

head (45). head (45). The covermember The cover member (47) (47) is is provided provided to to cover cover thethe upper upper surface surface of of thefirst the first end endplate plate

portion (45a) and the outer peripheral surface of a lower portion of the first boss portion (45b). portion (45a) and the outer peripheral surface of a lower portion of the first boss portion (45b).

A muffler A mufflerspace spacefor forreducing reducing pulsation pulsation of of thethe refrigerant refrigerant discharged discharged through through the the discharge discharge

passage is passage is formed inside the formed inside the cover member(47). cover member (47).

[0056]

(3) (3) Muffler Muffler

As illustrated As illustrated in in FIGS. FIGS. 22and and3,3,the thecompression compression mechanism mechanism (40)a has (40) has a resonance resonance

muffler (50). muffler (50). The resonancemuffler The resonance muffler(50) (50) is is provided to reduce provided to noise produced reduce noise byresonance produced by resonanceinin

the casing the (10). The casing (10). resonancemuffler The resonance muffler(50) (50)ofofthis this embodiment embodimentis is a Helmholtz a Helmholtz muffler muffler (50). (50).

Themuffler The muffler(50) (50) of of this this embodiment hasa acavity embodiment has cavity (51), (51), aa first firstcommunication passage(52), communication passage (52), and and

a first opening (53). a first opening (53).

[0057]

Thecavity The cavity (51) (51)isis aa space space formed formedinina avertically-long vertically-longcircular circular columnar columnarshape. shape.TheThe

cavity (51) cavity (51) extends extendsininthethedirection direction in in which which the plurality the plurality of members of members constituting constituting the the

compressionmechanism compression mechanism (40)(40) overlap overlap with with each each otherother (the (the top-bottom top-bottom direction). direction). The cavity The cavity

(51) is formed (51) is formed across across the the first first endend plate plate portion portion (45a) (45a) of theof the head front front(45), headthe(45), the cylinder cylinder (41), (41),

and the second end plate portion (46a) of the rear head (46). and the second end plate portion (46a) of the rear head (46).

[0058]

15

Specifically, thelower Specifically, the lowerendend surface surface of the of the first first end end plateplate portion portion (45a) (45a) of the of the head front front head

(45) (45) has a first has a firstrecess recess(61) (61)that thatis is recessed upward. recessed upward.The The upper upper end surface of end surface of the the second secondend end

plate portion plate portion (46a) (46a) of of the the rear rear head head (46) (46) has has aa second recess (62) second recess (62) that that is is recessed recessed downward. downward.

Thecylinder The cylinder (41) (41) has has aa through through hole hole (63) (63) penetrating penetrating therethrough therethrough in in the the top-bottom direction top-bottom direction

(the axial direction). (the axial direction).The The firstrecess first recess (61) (61) of front of the the front head head (45), (45), the the through through hole (63)hole (63) of the of the

cylinder (41), cylinder (41), and and the the second recess (62) second recess (62) of of the the rear rearhead head(46) (46)have have the thesame same diameter and are diameter and are

arranged coaxially. arranged coaxially.

[0059]

Internal spaces of the first recess (61) of the front head (45), the through hole (63) of Internal spaces of the first recess (61) of the front head (45), the through hole (63) of

the cylinder (41), and the second recess (62) of the rear head (46) constitute the cavity (51). In the cylinder (41), and the second recess (62) of the rear head (46) constitute the cavity (51). In

other words, each internal space of the first recess (61) of the front head (45), the through hole other words, each internal space of the first recess (61) of the front head (45), the through hole

(63) of the (63) of thecylinder cylinder(41), (41),andand thethe second second recess recess (62) (62) of theof thehead rear rear(46) headconstitutes (46) constitutes part of the part of the

cavity (51). In this embodiment, the front head (45) and the rear head (46) correspond to a first cavity (51). In this embodiment, the front head (45) and the rear head (46) correspond to a first

member(E1) member (E1) ofof thepresent the presentdisclosure, disclosure,and andthe thecylinder cylinder(41) (41) corresponds correspondstotoaasecond secondmember member

(E2) of the present disclosure. (E2) of the present disclosure.

[0060]

A resonance A resonancechamber chamber(R)(R) is is formed formed in in thecavity the cavity(51). (51).InInthis this embodiment, embodiment, thecavity the cavity

(51) (51) as as aa whole whole constitutes constitutes the theresonance resonance chamber (R). chamber (R).

[0061]

Thefirst The first communication passage(52) communication passage (52)communicates communicateswithwith the the resonance resonance chamber chamber (R). (R).

In this In this embodiment, thefirst embodiment, the first communication passage communication passage (52)communicates (52) communicates with with the cavity the cavity (51). (51).

Thefirst The first communication passage communication passage (52)hashasa acircular (52) circularsection. section. The Thefirst first communication passage communication passage

(52) hasa asectional (52) has sectionalarea area smaller smaller thanthan that that of cavity of the the cavity (51). (51). Thecommunication The first first communication passage passage

(52) extends (52) radially outward extends radially fromthe outward from thecavity cavity(51) (51)toward towardthetheouter outerperipheral peripheralsurface surfaceofofthe the

compressionmechanism compression mechanism (40). (40). Specifically, Specifically, thethefirst first communication communication passage passage (52) (52) consists consists of of a a

16 grooveextending groove extendingradially radially outward outwardfrom from theinner the innerperipheral peripheralsurface surfaceofofthe thesecond secondrecess recess(62) (62) of the second end plate portion (46a) of the rear head (46) toward the outer peripheral surface of the second end plate portion (46a) of the rear head (46) toward the outer peripheral surface of the of the second endplate second end plate portion portion (46a). (46a). This This groove grooveisis formed formedononthetheupper upper endend surface surface of of thethe secondend second endplate plate portion portion (46a). (46a). The first communication The first passage(52) communication passage (52)isisformed formedbybythethegroove groove formed on the upper end surface of the second end plate portion (46a) and the lower end surface formed on the upper end surface of the second end plate portion (46a) and the lower end surface of the of the cylinder cylinder (41). (41).The The first firstcommunication passage(52) communication passage (52) communicates communicates with with a lower a lower part part of of the cavity (51). the cavity (51).

[0062]

Thefirst The first opening (53) is opening (53) is formed at an formed at an end end portion portion of of the the first firstcommunication passage communication passage

(52) oppositetotothe (52) opposite thecavity cavity (51). (51). TheThe first first opening opening (53) (53) is formed is formed on the on theperipheral outer outer peripheral surface surface

of the rear head (46). In other words, the first opening (53) is formed on the outer peripheral of the rear head (46). In other words, the first opening (53) is formed on the outer peripheral

surface of surface of the the compression mechanism compression mechanism (40). (40). TheThe firstopening first opening (53) (53) isisopen opentotothe theinside insideofof the the

casing (10). Specifically, the first opening (53) is open to the refrigerant space (S). The first casing (10). Specifically, the first opening (53) is open to the refrigerant space (S). The first

opening (53) is open to a portion below the cylinder (41) in the casing (10). The first opening opening (53) is open to a portion below the cylinder (41) in the casing (10). The first opening

(53) faces radially outward. (53) faces radially outward.

[0063]

Thefirst The first communication passage(52) communication passage (52)allows allowsthethecavity cavity(51) (51)totocommunicate communicate with with thethe

refrigerant space refrigerant space (S). (S). In In other other words, words, the the first firstcommunication passage(52) communication passage (52)allows allowsthe thecavity cavity

(51) to (51) to communicate with communicate with a space a space below below the the cylinder cylinder (41) (41) in in thethe casing casing (10).TheThe (10). cavity cavity (51) (51)

does not does not communicate communicate with with thethe discharge discharge passage passage formed formed in the in the compression compression mechanism mechanism (40). (40).

[0064]

In the In the muffler muffler (50) (50) of ofthis thisembodiment, the volume embodiment, the ofthe volume of the resonance resonancechamber chamber (R),thethe (R),

sectional area of the first communication passage (52) (the area of a section parallel with the sectional area of the first communication passage (52) (the area of a section parallel with the

drive shaft drive shaft (30)), (30)), and the length and the length of of the the first first communication passage communication passage (52) (52) (the (the length length in in thethe

direction perpendicular to the drive shaft (30)) are set so that the resonance frequency (natural direction perpendicular to the drive shaft (30)) are set SO that the resonance frequency (natural

17 frequency) of frequency) of the the muffler muffler(50) (50)isis equal equaltoto the the frequency frequencyofofresonance resonance produced produced nearnear the the oil oil surface in the reservoir (16). surface in the reservoir (16).

[0065]

(4) Operation (4) of Compressor Operation of Compressor

Next, operation Next, operation of of the the compressor (100)will compressor (100) will be be described. described.

[0066]

When electric power is supplied to the electric motor (20), the rotor (22) is rotated by When electric power is supplied to the electric motor (20), the rotor (22) is rotated by

a rotating magnetic field produced inside the stator (21). When the rotor (22) rotates, the drive a rotating magnetic field produced inside the stator (21). When the rotor (22) rotates, the drive

shaft (30) shaft (30) rotates. rotates. When thedrive When the drive shaft shaft (30) (30) rotates, rotates, thethe piston piston (44) (44) of the of the compression compression

mechanism mechanism (40) (40) coupled coupled to the to the drive drive shaft shaft (30)(30) oscillates oscillates in in thethe compression compression chamber chamber (C). (C).

Accordingly,the Accordingly, thevolumes volumesof of the the low-pressure low-pressure chamber chamber and high-pressure and high-pressure chamber chamber of the of the

compressionchamber compression chamber(C)(C) change change periodically, periodically, and and the the compression compression chamber chamber (C) performs (C) performs a a

suction operation, suction operation,a acompression compression operation, operation, and a and a discharge discharge operation operation of refrigerant of refrigerant

continuously. continuously.

[0067]

Therefrigerant The refrigerant sucked into the sucked into the low-pressure low-pressure chamber ofthe chamber of the compression compressionchamber chamber(C)(C)

through the through the suction suction pipe pipe (14) (14) is is compressed compressed ininthe the high-pressure high-pressurechamber chamberof of thecompression the compression

chamber(C), chamber (C),and andthen thenisisdischarged dischargedinto intothe themuffler mufflerspace spaceininthe the cover covermember member (47) (47) through through

the discharge the passage. The discharge passage. Therefrigerant refrigerant discharged dischargedinto intothe themuffler mufflerspace spaceisisdischarged dischargedinto intoa a

space between space betweenthe thecompression compression mechanism mechanism (40) (40) and electric and the the electric motor motor (20) (20) in the in the casing casing (10)(10)

through the through the through through hole hole formed formedinin the the cover cover member member (47).The (47). Therefrigerant refrigerantdischarged dischargedfrom fromthe the

cover member cover member (47) (47) passes passes through through a space a space between between the the stator stator (21) (21) andand rotor rotor (22) (22) (a (a so-called so-called

air gap) air of the gap) of the electric electric motor motor(20), (20),reaches reachesa aspace space above above the the electric electric motor motor (20),(20), and and is is

discharged to the outside of the casing (10) through the discharge pipe (15). discharged to the outside of the casing (10) through the discharge pipe (15).

[0068]

18

In the In the hermetically-closed hermetically-closed compressor compressor(100) (100)of of thisthis embodiment, embodiment, pressure pressure

considerably fluctuates near both axial end portions of the casing (10), and noise is likely to be considerably fluctuates near both axial end portions of the casing (10), and noise is likely to be

producedbybyresonance. produced resonance.TheThe oiloil surfaceininthe surface thereservoir reservoir(16) (16)formed formedinin thebottom the bottom portion portion of of

the casing the (10) is casing (10) is usually usually positioned at aa level positioned at level that thatallows allows part part or or whole of the whole of the compression compression

mechanism (40) to be immersed in the oil in order to lubricate the sliding portion and the like mechanism (40) to be immersed in the oil in order to lubricate the sliding portion and the like

of the of the compression mechanism compression mechanism (40). (40). Thus, Thus, noise noise is is likelytotobebeproduced likely producedbyby resonance resonance around around

the compression mechanism (40), that is, near the oil surface in the casing (10). In contrast, in the compression mechanism (40), that is, near the oil surface in the casing (10). In contrast, in

this embodiment, this the first embodiment, the first opening opening (53) (53) of of the Helmholtz muffler the Helmholtz muffler (50) (50) formed formedininthe the

compressionmechanism compression mechanism (40)(40) is formed is formed onouter on the the outer peripheral peripheral surface surface of theof the compression compression

mechanism mechanism (40). (40). Accordingly, Accordingly, noise noise produced produced by resonance by resonance near the near the oil can oil surface surface be can be

efficiently reduced. efficiently reduced.

[0069]

(5) Features (5) Features

(5–1) (5-1)

Thefirst The first opening (53) of opening (53) of the the muffler muffler (50) (50) of of this this embodiment embodiment isisformed formedononthetheouter outer

peripheral surface peripheral surface of of the the compression compressionmechanism mechanism (40). (40). Accordingly, Accordingly, vibration vibration by resonance by resonance

near the near the oil oil surface surface in in the the casing casing (10) (10) can canbebereduced. reduced.AsAs a result,noise a result, noiseproduced produced by this by this

vibration can vibration can be be reduced. reduced.

[0070]

(5–2) (5-2)

The front head (45) of this embodiment has the first recess (61), and the rear head (46) The front head (45) of this embodiment has the first recess (61), and the rear head (46)

has the has the second secondrecess recess(62). (62). The Theinternal internal spaces spacesofofthe the first first recess recess (61) (61) and and the the second recess second recess

(62) constitute part of the cavity (51). Part of the cavity (51) is constituted by the internal spaces (62) constitute part of the cavity (51). Part of the cavity (51) is constituted by the internal spaces

of the first recess (61) and the second recess (62), and thus the cavity (51) can be formed in the of the first recess (61) and the second recess (62), and thus the cavity (51) can be formed in the

front head (45) and the rear head (46) by simple processing. front head (45) and the rear head (46) by simple processing.

19

[0071]

(5–3) (5-3)

The cylinder (41) of this embodiment has the through hole (63) penetrating the cylinder The cylinder (41) of this embodiment has the through hole (63) penetrating the cylinder

(41) in the top-bottom direction. The internal space of the through hole (63) constitutes part of (41) in the top-bottom direction. The internal space of the through hole (63) constitutes part of

the cavity (51). Part of the cavity (51) is constituted by the through hole (63), and thus the cavity the cavity (51). Part of the cavity (51) is constituted by the through hole (63), and thus the cavity

(51) can (51) can be be formed in the formed in the cylinder cylinder by by simple processing. simple processing.

[0072]

(5–4) (5-4)

Thecavity The cavity (51) (51) of of this this embodiment embodiment isisformed formedacross acrossthe thecylinder cylinder(41), (41),the the front front head head

(45), and (45), the rear and the rear head head (46). (46). Accordingly, Accordingly,the thecavity cavity(51) (51)can canbebeformed formed without without additional additional

membersforforthe members thecompression compression mechanism mechanism (40).(40).

[0073]

(6) Variations (6) Variations

The above The aboveembodiment embodimentmaymay be modified be modified to the to the following following variations.Basically, variations. Basically,

differences from differences the above from the embodiment above embodiment will will be be described described below. below.

[0074]

(6–1) First Variation (6-1) First Variation

In the In the compressor compressor (100) (100) of this of this embodiment, embodiment, the constituting the groove groove constituting the first the first

communication communication passage passage (52) (52) of of themuffler the muffler(50) (50)may maybe be formed formed on on thethe lower lower endend surface surface of of thethe

first end plate portion (45a) of the front head (45), the upper end surface of the cylinder (41), first end plate portion (45a) of the front head (45), the upper end surface of the cylinder (41),

or the lower end surface of the rear head (46). or the lower end surface of the rear head (46).

[0075]

(6–2) SecondVariation (6-2) Second Variation

In the In the compressor (100)ofofthis compressor (100) this embodiment, thefirst embodiment, the first communication communication passage passage (52) (52) of of

the muffler (50) may communicate with a lower end portion of the cavity (51). Specifically, for the muffler (50) may communicate with a lower end portion of the cavity (51). Specifically, for

20 example, as illustrated in FIG. 4, if the cavity (51) consists of the internal spaces of the first example, as illustrated in FIG. 4, if the cavity (51) consists of the internal spaces of the first recess (61) recess (61) of of the the front front head head(45) (45)and andthethethrough through hole hole (63) (63) of the of the cylinder cylinder (41), (41), the the first first communication passage communication passage (52) (52) maymay be constituted be constituted by abygroove a groove formed formed onlower on the the lower end surface end surface of the cylinder (41). of the cylinder (41).

[0076]

<<Second Embodiment>> <<Second Embodiment>>

A second A secondembodiment embodimentwillwill be be described. described. A compressor A compressor (100) (100) of this of this embodiment embodiment has has

a first a first communication passage communication passage (52)(52) and and a first a first opening opening (53) different (53) different from of from those those the of the

compressor (100) compressor (100) ofofthe thefirst first embodiment. embodiment.Here, Here, the the differences differences between between the first the first

communication communication passage passage (52)(52) and first and the the first opening opening (53) (53) of of embodiment this this embodiment and the and the first first

communication passage (52) and the first opening (53) of the first embodiment will be described. communication passage (52) and the first opening (53) of the first embodiment will be described.

[0077]

(1) First (1) FirstCommunication Passage Communication Passage and and FirstOpening First Opening

As illustrated As illustrated in in FIG. 5, the FIG. 5, the first first communication passage communication passage (52) (52) of of this this embodiment embodiment

extends downward extends downwardfrom fromthethe cavity(51) cavity (51)toward toward thethe lower lower surface surface of of thethe compression compression

mechanism (40). Specifically, the first communication passage (52) consists of a hole extending mechanism (40). Specifically, the first communication passage (52) consists of a hole extending

downward downward from from thethe bottom bottom surface surface of the of the second second recess recess (62)(62) in the in the second second end plate end plate portion portion

(46a) of the rear head (46) toward the lower end surface of the second end plate portion (46a). (46a) of the rear head (46) toward the lower end surface of the second end plate portion (46a).

Thehole The holeopens openson on thethe lower lower end end surface surface of second of the the second end portion end plate plate portion (46a). (46a). The The first first

communication communication passage passage (52) (52) communicates communicates with with the lower the lower surface surface of cavity of the the cavity (51). (51).

[0078]

(52) (52) opposite to the opposite to the cavity cavity (51). (51). The The first firstopening opening (53) (53) is isformed formed on the lower on the lower surface surface of of the the

rear head rear (46). In head (46). In other other words, words,the the first first opening (53) is opening (53) is formed formedononthethelower lower surface surface of of thethe

compression mechanism (40). The first opening (53) faces the oil surface in the reservoir (16). compression mechanism (40). The first opening (53) faces the oil surface in the reservoir (16).

21

[0079]

(2) Features (2) Features

Thefirst The first opening (53) of opening (53) of the the muffler muffler (50) (50) of of this thisembodiment is formed embodiment is formedononthe thelower lower

surface of surface of the the compression mechanism compression mechanism (40). (40). Accordingly, Accordingly, vibration vibration by resonance by resonance nearnear the the oil oil

surface in the casing (10) can be reduced. As a result, noise produced by this vibration can be surface in the casing (10) can be reduced. As a result, noise produced by this vibration can be

reduced. reduced.

[0080]

(3) (3) Variations Variations

[0081]

(3–1) FirstVariation (3-1) First Variation

As illustrated As illustrated in in FIG. FIG. 6, 6, in in the the compressor (100) of compressor (100) of this this embodiment, embodiment,thetheresonance resonance

muffler (50) muffler (50) may maybebea aside-branch side-branchmuffler. muffler.Specifically, Specifically,the the muffler muffler(50) (50)ofof this this embodiment embodiment

may consist of the cavity (51) and the first opening (53). In other words, the muffler (50) of this may consist of the cavity (51) and the first opening (53). In other words, the muffler (50) of this

variation does variation not have does not havethe the first first communication passage communication passage (52) (52) unlike unlike thethe above above embodiment. embodiment.

Thefirst The first opening (53) is opening (53) is open to the open to the lower lower surface surfaceof of the the compression compressionmechanism mechanism (40). (40). The The

first opening (53) faces downward. The first opening (53) faces the oil surface in the reservoir first opening (53) faces downward. The first opening (53) faces the oil surface in the reservoir

(16). (16).

[0082]

If the If the first firstopening (53) facing opening (53) facing downward downward is formed is formed on a on a member member other other than thethan the

lowermostmember lowermost member among among the members the members constituting constituting the compression the compression mechanism mechanism (40) as (40) as in in this this

variation, the variation, the first firstopening opening(53) (53)isisformed formed on on aa portion portion where the member where the member on on which which the the first first

opening (53)is opening (53) is formed formeddoes doesnot notoverlap overlapa amember member disposed disposed below below the member the member on the on which which the

first opening (53) is formed. first opening (53) is formed.

22

[0083]

(3–2) SecondVariation (3-2) Second Variation

In the In the compressor compressor (100) (100)ofofthis thisembodiment, embodiment, thethe holehole constitutingthethe constituting first first

communication communication passage passage (52) (52) of of thethe muffler muffler (50)maymay (50) be be formed formed across across a plurality a plurality of of members members

constituting the constituting the compression mechanism compression mechanism (40).ForFor (40). example, example, if if thethecavity cavity(51) (51)isis formed formedacross across

the front the front head head (45) (45) and and the the cylinder cylinder (41), (41),the thefirst communication first communication passage passage (52) (52) may be formed may be formed

across the cylinder (41) and the rear head (46). In this case, the first opening (53) is formed on across the cylinder (41) and the rear head (46). In this case, the first opening (53) is formed on

the lower end surface of the rear head (46). the lower end surface of the rear head (46).

[0084]

<<Third <<Third Embodiment>> Embodiment>>

A third A third embodiment willbebedescribed. embodiment will described.A A compressor compressor (100) (100) of this of this embodiment embodiment has ahas a

muffler (50) muffler (50) different different from from that that of of the the compressor compressor(100) (100) of of thethe firstembodiment. first embodiment. Here, Here, the the

differences between differences betweenthe themuffler muffler(50) (50) of of thisembodiment this embodiment andmuffler and the the muffler (50) (50) of the of the first first

embodiment embodiment willbebedescribed. will described.

[0085]

(1) Muffler (1) Muffler

As illustrated in FIG. 7, the muffler (50) of this embodiment has the cavity (51), the As illustrated in FIG. 7, the muffler (50) of this embodiment has the cavity (51), the

first communication first passage(52), communication passage (52), the the first firstopening opening(53), (53),a second a secondcommunication passage(54), communication passage (54),

and aa second and opening(55). second opening (55).In In other other words, words, the the muffler muffler (50) (50) of of this thisembodiment further has embodiment further has the the

secondcommunication second communication passage passage (54) (54) andand thethe second second opening opening (55)(55) unlike unlike the the muffler muffler (50) (50) of of thethe

first firstembodiment. Similarlytotothe embodiment. Similarly thefirst first embodiment, embodiment, thethe cavity cavity (51) (51) of of this this embodiment embodiment is is

formed across the first end plate portion (45a) of the front head (45), the cylinder (41), and the formed across the first end plate portion (45a) of the front head (45), the cylinder (41), and the

second end plate portion (46a) of the rear head (46). Specifically, internal spaces of the first second end plate portion (46a) of the rear head (46). Specifically, internal spaces of the first

recess (61) recess (61) of of the the front front head head (45), (45), the the through through hole (63) of hole (63) of the the cylinder cylinder (41), (41), and and the the second second

recess (62) of the rear head (46) constitute the cavity (51). recess (62) of the rear head (46) constitute the cavity (51).

23

[0086]

Thefirst The first communication passage(52) communication passage (52)consists consistsofofaa groove grooveextending extendingradially radiallyoutward outward

from the inner peripheral surface of the first recess (61) of the first end plate portion (45a) of from the inner peripheral surface of the first recess (61) of the first end plate portion (45a) of

the front head (45) toward the outer peripheral surface of the first end plate portion (45a). This the front head (45) toward the outer peripheral surface of the first end plate portion (45a). This

grooveisis formed groove formedon on thethe lower lower end end surface surface offirst of the the first end plate end plate portion portion (45a).(45a). The The first first

communication communication passage passage (52) (52) is is formed formed by the by the groove groove formed formed onlower on the the lower end surface end surface of theof the

first end first plate portion end plate portion (45a) (45a)andand thethe upper upper end surface end surface of theof the cylinder cylinder (41). (41). The The first first

communication communication passage passage (52) (52) communicates communicates with with the upper the upper part part of the of the cavity cavity (51). (51).

[0087]

The first opening (53) is formed on the outer peripheral surface of the front head (45). The first opening (53) is formed on the outer peripheral surface of the front head (45).

In other In other words, words,thethefirst firstopening opening (53) (53) is formed is formed onouter on the the outer peripheral peripheral surfacesurface of the of the

compressionmechanism compression mechanism (40). (40). The The first first opening opening (53)(53) is open is open to the to the inside inside of of thethe casing casing (10). (10).

Specifically, thefirst Specifically, the first opening opening (53) (53) is is open open to the to the refrigerant refrigerant spacespace (S).first (S). The The opening first opening (53) is (53) is

open to a portion above the cylinder (41) in the casing (10). The first opening (53) faces radially open to a portion above the cylinder (41) in the casing (10). The first opening (53) faces radially

outward. outward.

[0088]

(51) to (51) to communicate with communicate with a space a space between between the the compression compression mechanism mechanism (40) (40) and theand the electric electric

motor (20) in the casing (10). motor (20) in the casing (10).

[0089]

The second The second communication communicationpassage passage(54) (54)communicates communicateswith withthe thecavity cavity (51). (51). The The

secondcommunication second communication passage passage (54)(54) is aispassage a passage through through whichwhich theinoilthein reservoir the oil the reservoir (16) (16)

flows in flows in and and out. out. The secondcommunication The second communication passage passage (54) (54) has has a a circular circular section. section. TheThe second second

communication passage communication passage (54) (54) has has a sectional a sectional area smaller area smaller than thatthan thatcavity of the of the(51). cavity The (51). The second second

24 24 communication communication passage passage (54) (54) extends extends radially radially outward outward from from the cavity the cavity (51) (51) toward toward the outer the outer peripheral surface peripheral surface of ofthe thecompression compression mechanism (40).Specifically, mechanism (40). Specifically, the the second communication second communication passage (54) passage (54) consists consists of of aa groove groove extending radially outward extending radially fromthe outward from theinner innerperipheral peripheral surface surface of the second recess (62) of the second end plate portion (46a) of the rear head (46) toward the of the second recess (62) of the second end plate portion (46a) of the rear head (46) toward the outer peripheral outer peripheral surface surface of of the the second secondend endplate plateportion portion(46a). (46a).The Thegroove groove is is formed formed on the on the upper end upper endsurface surface of of the the second endplate second end plate portion portion (46a). (46a). The first communication The first passage(54) communication passage (54) is formed is by the formed by the groove formedononthe groove formed theupper upperend endsurface surfaceofofthe thesecond secondend endplate plateportion portion(46a) (46a) and the and the lower lowerendend surface surface of of the the cylinder cylinder (41). (41). The The second second communication communication passage passage (54) (54) communicates communicates with with thethe lower lower partofofthe part thecavity cavity(51). (51).

[0090]

Thesecond The secondopening opening (55) (55) is is formed formed at an at an end end portion portion of the of the second second communication communication

passage (54) passage (54)opposite oppositetotothe thecavity cavity(51). (51).The The second second opening opening (55) (55) is formed is formed on theon the outer outer

peripheral surface peripheral surface of of the the rear rearhead head (46). (46).In Inother otherwords, words,the thesecond second opening opening (55) (55) is is formed on formed on

the outer the outer peripheral peripheralsurface surfaceofofthe compression the compressionmechanism (40). The mechanism (40). Thesecond secondopening opening(55) (55)faces faces

radially outward. radially outward.

[0091]

Thesecond The secondcommunication communication passage passage (54)(54) allows allows the cavity the cavity (51)(51) to communicate to communicate with with

a space a belowthe space below thecylinder cylinder(41) (41)in in the the casing casing (10). (10). The secondopening The second opening (55)isisformed (55) formed below below

the first opening (53). the first opening (53).

[0092]

Here, the level of oil stored in the reservoir (16) of the casing (10) changes according Here, the level of oil stored in the reservoir (16) of the casing (10) changes according

to the operation state of the compressor (100). As illustrated in FIG. 7, if the oil level A in the to the operation state of the compressor (100). As illustrated in FIG. 7, if the oil level A in the

reservoir (16) is above the second opening (55), the oil in the reservoir (16) flows into the cavity reservoir (16) is above the second opening (55), the oil in the reservoir (16) flows into the cavity

(51) through (51) the second through the secondopening opening(55). (55).The Theoiloilhaving havingflowed flowed intothethecavity into cavity(51) (51)flows flowstotothe the

same level as that of oil in the reservoir (16). In this case, the bottom surface of the resonance same level as that of oil in the reservoir (16). In this case, the bottom surface of the resonance

25 chamber(R) chamber (R)ininthe thecavity cavity(51) (51) consists consists of of the the oil oilsurface. surface.Accordingly, Accordingly, the theHelmholtz muffler Helmholtz muffler

(50) (50) of of this thisembodiment serves aa silencing embodiment serves silencing function function using using the the first firstcommunication communication passage (52) passage (52)

and the resonance chamber (R) that has the bottom surface consisting of the oil surface. and the resonance chamber (R) that has the bottom surface consisting of the oil surface.

[0093]

When the oil level A in the reservoir (16) rises, the oil further flows into the cavity (51) When the oil level A in the reservoir (16) rises, the oil further flows into the cavity (51)

through the through the second secondopening opening(55), (55),and andthe thevolume volumeof of theresonance the resonance chamber chamber (R) (R) of the of the muffler muffler

(50) decreases. When (50) decreases. When thethe volume volume of resonance of the the resonance chamber chamber (R) decreases, (R) decreases, the resonance the resonance

frequencyofofthe frequency themuffler muffler(50) (50)increases. increases.InIncontrast, contrast, when whenthe theoil oillevel level inin the the reservoir reservoir (16) (16)

lowers, the oil flows out of the cavity (51) through the second opening (55), and the volume of lowers, the oil flows out of the cavity (51) through the second opening (55), and the volume of

the resonance the chamber(R) resonance chamber (R)increases. increases. When Whenthe thevolume volumeof of theresonance the resonance chamber chamber (R)(R) increases, increases,

the resonance frequency of the muffler (50) decreases. In this manner, the muffler (50) has the the resonance frequency of the muffler (50) decreases. In this manner, the muffler (50) has the

secondopening second opening(55), (55),and andthus thusthe theresonance resonancefrequency frequency of of thethe muffler muffler (50) (50) changes changes as the as the oiloil

level in the reservoir (16) changes. If the oil level in the reservoir (16) is below the second level in the reservoir (16) changes. If the oil level in the reservoir (16) is below the second

opening (55), the muffler (50) does not serve a silencing function. opening (55), the muffler (50) does not serve a silencing function.

[0094]

In the In the hermetically-closed compressor(100), hermetically-closed compressor (100),thetheresonance resonance frequency frequency in the in the casing casing

(10) changes as the oil level in the reservoir (16) changes. Specifically, for example, if the oil (10) changes as the oil level in the reservoir (16) changes. Specifically, for example, if the oil

level isislow, level low,such such as asifif thetheoiloil level is below level the the is below compression mechanism compression mechanism (40), (40), resonance with resonance with

a low frequency (about 830 Hz) is generated in the casing (10). In contrast, for example, if the a low frequency (about 830 Hz) is generated in the casing (10). In contrast, for example, if the

oil level is high, such as if the oil level is at a substantially middle part of the cylinder (41) of oil level is high, such as if the oil level is at a substantially middle part of the cylinder (41) of

the compression the mechanism compression mechanism (40), (40), resonance resonance with with a high a high frequency frequency (about (about 1.3 1.3 kHz kHz to 1.4 to 1.4 kHz)kHz)

is generated in the casing (10). is generated in the casing (10).

[0095]

In this In this embodiment, embodiment, thethe compression compression mechanism mechanism (40) of (40) of the hermetically-closed the hermetically-closed

compressor(100) compressor (100)includes includesthe themuffler muffler(50) (50) having havingthe the second secondopening opening(55). (55).Accordingly, Accordingly,ifif the the

26 oil level in the reservoir (16) is low, resonance with a low frequency in the casing (10) can be oil level in the reservoir (16) is low, resonance with a low frequency in the casing (10) can be reducedby reduced bythe the muffler muffler(50) (50) having havingthe theresonance resonancechamber chamber(R)(R) that that hashas a largervolume a larger volumeduedue to to fluctuation in the oil level. In contrast, if the oil level in the reservoir (16) is high, resonance fluctuation in the oil level. In contrast, if the oil level in the reservoir (16) is high, resonance with a high frequency in the casing (10) can be reduced by the muffler (50) having the resonance with a high frequency in the casing (10) can be reduced by the muffler (50) having the resonance chamber (R) that has a smaller volume due to fluctuation in the oil level. chamber (R) that has a smaller volume due to fluctuation in the oil level.

[0096]

Here, as described above, the level of oil stored in the reservoir (16) of the casing (10) Here, as described above, the level of oil stored in the reservoir (16) of the casing (10)

changes according to the operation state of the compressor (100). The first opening (53) of this changes according to the operation state of the compressor (100). The first opening (53) of this

embodiment embodiment is is formed formed below below an initial an initial supply supply position position (A1) (A1) illustrated illustrated in in FIG. FIG. 7, 7, which which is is a a

position of the oil surface in the reservoir (16) reached at the time of shipment of the compressor position of the oil surface in the reservoir (16) reached at the time of shipment of the compressor

(100). Thisinitial (100). This initialsupply supplyposition position (A1) (A1) is aisposition a position of oil of the the surface oil surface reached reached by the by the of amount amount of

oil initially supplied to the casing (10) at the time of shipment of the compressor (100). When oil initially supplied to the casing (10) at the time of shipment of the compressor (100). When

the oil surface in the reservoir (16) is at the initial supply position (A1), the oil flows into the the oil surface in the reservoir (16) is at the initial supply position (A1), the oil flows into the

cavity (51) also through the first opening (53), and the cavity (51) is filled with the oil. At this cavity (51) also through the first opening (53), and the cavity (51) is filled with the oil. At this

time, the muffler (50) does not serve a silencing function. time, the muffler (50) does not serve a silencing function.

[0097]

Whenthetheposition When positionofofthe theoil oil surface surface in in the the reservoir reservoir (16) (16) lowers to aa position lowers to position below below

the first the firstopening opening (53) (53) as as the the compressor (100)operates, compressor (100) operates, the the first first opening (53) communicates opening (53) communicates

with the with the refrigerant refrigerant space (S). By space (S). the first By the first opening (53) communicating opening (53) communicating with with the the refrigerant refrigerant

space (S), space (S), the the cavity cavity (51) (51) of ofthe themuffler muffler(50) (50)communicates withthe communicates with therefrigerant refrigerant space (S) and space (S) and

the muffler the (50) serves muffler (50) serves aa silencing silencing function. function. Accordingly, noise with Accordingly, noise withaalow lowfrequency frequency thatisis that

produced as the oil level in the reservoir (16) lowers can be reduced. produced as the oil level in the reservoir (16) lowers can be reduced.

[0098]

(2) Features (2) Features

(2–1) (2-1)

27

Themuffler The muffler (50) (50) of of this thisembodiment hasthe embodiment has the second secondopening opening(55) (55)which whichcommunicates communicates

with the with the cavity cavity (51) (51) and and through throughwhich whichthetheoiloilflows flowsininand andout. out.The The second second opening opening (55)(55) is is

formedbelow formed belowthe thefirst first opening (53). opening (53).

[0099]

Whenthetheoiloillevel When levelininthe thereservoir reservoir (16) (16) rises rises and andthe the oil oil flows flows into into the the cavity cavity (51) (51)

through the second opening (55), the bottom surface of the resonance chamber (R) is constituted through the second opening (55), the bottom surface of the resonance chamber (R) is constituted

by the oil surface. The second opening (55) is formed below the first opening (53), and thus the by the oil surface. The second opening (55) is formed below the first opening (53), and thus the

Helmholtzmuffler Helmholtz muffler(50) (50)serves servesaasilencing silencing function function using using the the first first communication passage(52) communication passage (52)

and the and the resonance chamber(R). resonance chamber (R).

[0100]

When the oil level in the reservoir (16) rises, the oil flows into the cavity (51) through When the oil level in the reservoir (16) rises, the oil flows into the cavity (51) through

the second the opening(55), second opening (55),and andthe thevolume volumeof of thethe resonance resonance chamber chamber (R) decreases. (R) decreases. When When the the

volumeofofthe volume theresonance resonancechamber chamber (R) (R) decreases, decreases, the the resonance resonance frequency frequency of muffler of the the muffler (50) (50)

increases. In contrast, when the oil level in the reservoir (16) lowers, the oil flows out of the increases. In contrast, when the oil level in the reservoir (16) lowers, the oil flows out of the

cavity (51) cavity through the (51) through the second secondopening opening (55),andand (55), thethe volume volume of the of the resonance resonance chamber chamber (R) (R)

increases. When increases. thevolume When the volumeof of theresonance the resonance chamber chamber (R) (R) increases, increases, the the resonance resonance frequency frequency

of the muffler (50) decreases. In this manner, since the muffler (50) has the second opening (55), of the muffler (50) decreases. In this manner, since the muffler (50) has the second opening (55),

the oil the oil flows flows in in and and out out through the second through the opening(55), second opening (55),and andthe theresonance resonancefrequency frequency of of thethe

muffler (50) muffler (50) changes. changes.Accordingly, Accordingly,noise noisewith with a wide a wide range range of resonance of resonance frequency frequency can becan be

reduced by the single muffler (50). reduced by the single muffler (50).

[0101]

(2–2) (2-2)

Thefirst The first opening (53) of opening (53) of this thisembodiment is formed embodiment is formedbelow below theinitial the initial supply supplyposition position

(A1) which is a position of the oil surface in the reservoir (16) reached at the time of shipment, (A1) which is a position of the oil surface in the reservoir (16) reached at the time of shipment,

and communicates with the refrigerant space (S) when the oil level in the reservoir (16) lowers. and communicates with the refrigerant space (S) when the oil level in the reservoir (16) lowers.

28

[0102]

Since thefirst Since the firstopening opening (53) (53) is formed is formed below below the initial the initial supply supply position position (A1) (A1) which is which is

a position of the oil surface reached at the time of shipment, the oil flows into the cavity (51) a position of the oil surface reached at the time of shipment, the oil flows into the cavity (51)

of the muffler (50) through the first opening (53) when the oil surface is at the initial supply of the muffler (50) through the first opening (53) when the oil surface is at the initial supply

position (A1). position Then, when (A1). Then, whenthetheposition positionofofthetheoiloilsurface surfaceininthe thereservoir reservoir(16) (16)lowers lowersasasthe the

compressoroperates, compressor operates,thethefirst firstopening opening (53) (53) communicates communicates withrefrigerant with the the refrigerant space space (S), (S),

wherebythe whereby thecavity cavity(51) (51)ofofthe themuffler muffler(50) (50)communicates communicateswithwith the the refrigerant refrigerant space space (S) (S) andand

[0103]

(2–3) (2-3)

Themuffler The muffler(50) (50)ofofthis thisembodiment embodimenthas has the second the second communication communication passage passage (54) (54)

communicating with communicating with thethe cavity cavity (51).The (51). The second second opening opening (55)(55) is formed is formed at the at the end end portion portion of of

the second the communication second communication passage passage (54). (54).

[0104]

Since the Since the second second opening opening(55) (55)isisformed formed at at thethe endend portion portion of the of the second second

communication communication passage passage (54),the (54), theposition positionofofthe the second secondopening openingcan canbebeadjusted adjustedbybythe theposition position

of the of the second second communication passage communication passage (54).Accordingly, (54). Accordingly, thelevel the levelatatwhich whichthe theoil oil flows flows in in and and

out can out can be be adjusted, adjusted, and and thus thus the the volume of the volume of the resonance chamber(R) resonance chamber (R)can canbebeadjusted. adjusted.

[0105]

(3) (3) Variations Variations

(3–1) FirstVariation (3-1) First Variation

In the In the compressor (100)ofofthis compressor (100) this embodiment, embodiment, thethe second second opening opening (55)(55) onlyonly has has to to be be

formedbelow formed belowthethefirst firstopening opening(53). (53).Thus, Thus,thethegrooves grooves constituting constituting thefirst the firstcommunication communication

passage (52) passage (52) and andthe the second secondcommunication communication passage passage (54)(54) may may be formed be formed on anyon ofany the of the lower lower

29 end surface of the first end plate portion (45a) of the front head (45), the upper end surface of end surface of the first end plate portion (45a) of the front head (45), the upper end surface of the cylinder (41), the lower end surface of the rear head (46), and the upper end surface of the the cylinder (41), the lower end surface of the rear head (46), and the upper end surface of the second end plate portion (46a) of the rear head (46). second end plate portion (46a) of the rear head (46).

[0106]

(3–2) SecondVariation (3-2) Second Variation

As illustrated As illustrated in in FIG. 8, in FIG. 8, in the the compressor compressor(100) (100) of of this this embodiment, embodiment, the second the second

opening(55) opening (55) may maybebeformed formed on on thethe lower lower endend surface surface of of thethe rearhead rear head (46).InInother (46). otherwords, words,inin

this variation, this variation,the muffler the muffler(50) does (50) not does have not havethe second the secondcommunication passage(54). communication passage (54).

[0107]

Here, the cavity (51) is formed across the front head (45), the cylinder (41), and the Here, the cavity (51) is formed across the front head (45), the cylinder (41), and the

rear head (46). The rear head (46) is the lowermost one of the plurality of members constituting rear head (46). The rear head (46) is the lowermost one of the plurality of members constituting

the compression the mechanism compression mechanism (40). (40). In In thisembodiment, this embodiment,thethe rear rear head head (46) (46) corresponds corresponds to to a third a third

memberofofthe member thepresent presentdisclosure. disclosure.

[0108]

The rear head (46) of this variation has a through hole (63) penetrating therethrough in The rear head (46) of this variation has a through hole (63) penetrating therethrough in

the top-bottom direction (the axial direction). Internal spaces of the first recess (61) of the front the top-bottom direction (the axial direction). Internal spaces of the first recess (61) of the front

head (45), the through hole (63) of the cylinder (41), and the through hole (63) of the rear head head (45), the through hole (63) of the cylinder (41), and the through hole (63) of the rear head

(46) constitute the cavity (51). (46) constitute the cavity (51).

[0109]

Thesecond The secondopening opening (55)isisformed (55) formedon on thethe lower lower endend surface surface of of thethe rearhead rear head (46).InIn (46).

other words, other words,the thesecond secondopening opening (55)(55) is formed is formed onlower on the the lower surfacesurface of the of the compression compression

mechanism mechanism (40). (40). TheThe second second opening opening (55) (55) is is toward open open toward the reservoir the reservoir (16). (16). The The second second

opening (55) faces opening (55) faces downward. downward.The The second second opening opening (55)(55) is formed is formed below below the the first first opening opening (53). (53).

[0110]

As illustrated in FIG. 8, if the oil level A in the reservoir (16) is above the second As illustrated in FIG. 8, if the oil level A in the reservoir (16) is above the second

30 opening (55),thethe opening (55), oilininthethereservoir oil reservoir (16) (16) flows flows into into the cavity the cavity (51) through (51) through the opening the second second opening

(55). The (55). oil having The oil flowedinto having flowed intothe thecavity cavity(51) (51)flows flowstotothe thesame samelevel levelasasthat thatofofoil oil in in the the

reservoir (16). In this case, the bottom surface of the resonance chamber (R) in the cavity (51) reservoir (16). In this case, the bottom surface of the resonance chamber (R) in the cavity (51)

consists of consists of the the oil oil surface. surface.In Inthis thismanner, manner, the the Helmholtz muffler(50) Helmholtz muffler (50)ofofthis this variation variation also also

serves aa silencing serves silencing function functionusing usingthe thefirst first communication communication passage passage (52) (52) andresonance and the the resonance

chamber (R) that has the bottom surface consisting of the oil surface. chamber (R) that has the bottom surface consisting of the oil surface.

[0111]

Since the second opening (55) is formed on the lower end surface of the rear head (46) Since the second opening (55) is formed on the lower end surface of the rear head (46)

which is which is the the lowermost lowermost one oneofofthe theplurality plurality of of members membersconstituting constituting the the compression compression

mechanism mechanism (40),the (40), thesecond secondopening opening (55) (55) is is alsoformed also formed when when the the cavity cavity (51) (51) is is formed formed in in thethe

[0112]

<<Fourth Embodiment>: <<Fourth Embodiment>> Embodiment>>

A fourth A fourth embodiment willbebedescribed embodiment will describedbelow. below.A Acompressor compressor (100) (100) of of thisembodiment this embodiment

has aa muffler has muffler (50) (50) different different from that of from that of the the compressor (100)of compressor (100) of the the first first embodiment. Here, embodiment. Here,

the differences the differences between the muffler between the muffler(50) (50)ofof this this embodiment embodiment andand thethe muffler muffler (50) (50) of of thethe first first

embodiment embodiment willbebedescribed. will described.

[0113]

Themuffler The muffler(50) (50)ofofthis this embodiment embodiment includes includes a plurality a plurality of of mufflers mufflers (50). (50). In In other other

words, the words, the compression compressionmechanism mechanism (40)(40) of this of this embodiment embodiment includes includes the plurality the plurality of mufflers of mufflers

(50). The plurality of mufflers (50) are spaced at predetermined intervals in the circumferential (50). The plurality of mufflers (50) are spaced at predetermined intervals in the circumferential

direction so as to surround the drive shaft (30). In this embodiment, the compression mechanism direction SO as to surround the drive shaft (30). In this embodiment, the compression mechanism

(40) has (40) has two mufflers (50). two mufflers (50). The Thefirst first muffler muffler (50a) (50a) and the second and the muffler(50b) second muffler (50b)are aredisposed disposed

apart from apart each other from each other by by approximately approximately180°. 180°.The Thenumber number of mufflers of mufflers (50) (50) described described herein herein is is

merelyone merely oneexample. example.

31

[0114]

As illustrated in FIGS. 9 and 10, each of the first muffler (50a) and the second muffler As illustrated in FIGS. 9 and 10, each of the first muffler (50a) and the second muffler

(50b) has the cavity (51), the first communication passage (52), and the first opening (53). The (50b) has the cavity (51), the first communication passage (52), and the first opening (53). The

configurations of configurations of the the cavity cavity (51), (51), the the first firstcommunication passage(52), communication passage (52), and andthe the first first opening opening

(53) of the (53) of thefirst first muffler (50a)arearethethe muffler (50a) same same as those as those ofmuffler of the the muffler (50) (50) of the of theembodiment. first first embodiment.

[0115]

The cavity (51) of the second muffler (50b) is constituted by the internal spaces of the The cavity (51) of the second muffler (50b) is constituted by the internal spaces of the

first recess (61) formed in the front head (45) and the second recess (62) formed in the cylinder first recess (61) formed in the front head (45) and the second recess (62) formed in the cylinder

(41). In (41). In this this embodiment, thefront embodiment, the fronthead head(45) (45) andand thethe cylinder cylinder (41)(41) correspond correspond to first to the the first

memberofofthethepresent member presentdisclosure. disclosure.The Thefirst first recess recess (61) (61) of of the the front front head (45) and head (45) andthe the second second

recess (62) recess (62) of of the the cylinder cylinder (41) (41) have the same have the samediameter diameterand andarearearranged arranged coaxially.TheThe coaxially. first first

communication passage communication passage (52) (52) of of thethe second second muffler muffler (50b) (50b) is formed is formed by groove by the the groove formed formed on on

the lower end surface of the first end plate portion (45a) of the front head (45) and the upper the lower end surface of the first end plate portion (45a) of the front head (45) and the upper

end surface end surface of of the the cylinder cylinder (41). (41). The The first firstopening opening (53) (53) of of the thesecond second muffler muffler (50b) (50b) is is formed formed

on the outer peripheral surface of the front head (45). on the outer peripheral surface of the front head (45).

[0116]

The first opening (53) of the first muffler (50a) is positioned below the first opening The first opening (53) of the first muffler (50a) is positioned below the first opening

(53) (53) of of the the second muffler(50b). second muffler (50b).The Thevolume volumeof of thethe cavity cavity (51) (51) of of thethe firstmuffler first muffler(50a) (50a)isis

larger than the volume of the cavity (51) of the second muffler (50b). In other words, the volume larger than the volume of the cavity (51) of the second muffler (50b). In other words, the volume

of the resonance chamber (R) of the first muffler (50a) is larger than the volume of the resonance of the resonance chamber (R) of the first muffler (50a) is larger than the volume of the resonance

chamber(R) chamber (R)ofofthe thesecond second muffler muffler (50b). (50b). Thus, Thus, thethe resonance resonance frequency frequency of first of the the first muffler muffler

(50a) is (50a) is lower lower than than the the resonance resonance frequency of the frequency of the second muffler (50b). second muffler (50b).

[0117]

If as illustrated in FIG. 9, the oil level A in the reservoir (16) is below the first opening If as illustrated in FIG. 9, the oil level A in the reservoir (16) is below the first opening

(53) of the (53) of thefirst first muffler muffler(50a) (50a) (or(or if if theoiloillevel the level A in A in thethe reservoir reservoir (16)(16) is low), is low), resonance resonance with with

32 a low a lowfrequency frequencyis isgenerated generated in in thethe casing casing (10). (10). However, However, the first the first muffler muffler (50a), (50a), whose whose resonancefrequency resonance frequencyisis low, low, can can muffle muffleresonance resonancewith witha alow lowfrequency frequencygenerated generated inin thecasing the casing

(10). Accordingly, if the oil level in the reservoir (16) is low, noise produced by resonance in (10). Accordingly, if the oil level in the reservoir (16) is low, noise produced by resonance in

the casing (10) can be reduced by the first muffler (50a). the casing (10) can be reduced by the first muffler (50a).

[0118]

If as illustrated in FIG. 10, the oil level A in the reservoir (16) is above the first opening If as illustrated in FIG. 10, the oil level A in the reservoir (16) is above the first opening

(53) of the (53) of thefirst first muffler muffler(50a) (50a) andand below below the first the first opening opening (53) of(53) of themuffler the second second(50b) muffler (or (50b) (or

if the oil level A in the reservoir (16) is high), resonance with a high frequency is generated in if the oil level A in the reservoir (16) is high), resonance with a high frequency is generated in

the casing (10). In this case, the first muffler (50a) does not serve a silencing function because the casing (10). In this case, the first muffler (50a) does not serve a silencing function because

the oil flows into the cavity (51) through the first opening (53). On the other hand, since the the oil flows into the cavity (51) through the first opening (53). On the other hand, since the

first opening (53) of the second muffler (50b) is above the oil level A, the oil does not flow into first opening (53) of the second muffler (50b) is above the oil level A, the oil does not flow into

the cavity the cavity (51), (51), and and the the second secondmuffler muffler(50b) (50b) serves serves a silencing a silencing function. function. Specifically, Specifically, thethe

secondmuffler second muffler(50b), (50b),whose whose resonance resonance frequency frequency is can is high, high, can resonance muffle muffle resonance a high a high

frequency generated in the casing (10). Accordingly, if the oil level in the reservoir (16) is high, frequency generated in the casing (10). Accordingly, if the oil level in the reservoir (16) is high,

noise produced noise byresonance produced by resonanceininthe thecasing casing(10) (10)can canbebereduced reducedbybythe thesecond secondmuffler muffler(50b). (50b).

[0119]

In this In thismanner, manner, the the plurality pluralityofofmufflers mufflers(50) (50)provided providedininthe compression the compression mechanism mechanism

(40) can (40) can cope copewith withresonance resonance frequency frequency changing changing in casing in the the casing (10) (10) asoil as the thelevel oil level in in the the

reservoir (16) reservoir (16) changes. changes. Accordingly, noise with Accordingly, noise with aa wide widerange rangeofoffrequency frequencythat thatisisproduced producedinin

the casing (10) as the oil level changes can be reduced. The first muffler (50a) and the second the casing (10) as the oil level changes can be reduced. The first muffler (50a) and the second

muffler (50b) may have any of the structures of the first to third embodiments. muffler (50b) may have any of the structures of the first to third embodiments.

[0120]

<<Other embodiments>> <<Other embodiments>> <<Other embodiments>

Theabove The aboveembodiments embodimentsmay may be modified be modified as follows. as follows.

[0121]

33

In the In the compressor (100)ofofeach compressor (100) eachembodiment, embodiment, the the cavity cavity (51)(51) of the of the muffler muffler (50) (50) is is

formedacross formed acrossthe the plurality plurality of of members constituting the members constituting the compression mechanism compression mechanism (40), (40), butbut maymay

be formed be formedinin one onesingle single member. member.

[0122]

In the In the compressor (100)ofofeach compressor (100) eachembodiment, embodiment,if if thethecavity cavity(51) (51)ofofthe themuffler muffler(50) (50)isis

formedacross formed acrossthe theplurality pluralityofofmembers members constituting constituting the the compression compression mechanism mechanism (40), (40), the the

cavity (51) cavity (51) may be formed may be formedacross acrossany anyofofthe the plurality plurality of of members constituting the members constituting the compression compression

mechanism mechanism (40).For (40). Forexample, example, thethe cavity cavity (51)maymay (51) be be formed formed across across the the cylinder cylinder (41)(41) and and the the

rear head (46). rear head (46).

[0123]

In the In the compressor (100)ofofeach compressor (100) eachembodiment, embodiment,thethe cavity cavity (51) (51) ofof themuffler the muffler(50) (50)may may

be constituted only by the internal spaces of the recesses (61, 62) formed in any of the members be constituted only by the internal spaces of the recesses (61, 62) formed in any of the members

constituting the constituting the compression mechanism compression mechanism (40). (40). Specifically,for Specifically, forexample, example,asasillustrated illustrated in in FIG. FIG.

9, the cavity (51) of the second muffler (50b) may be constituted by the first recess (61) recessed 9, the cavity (51) of the second muffler (50b) may be constituted by the first recess (61) recessed

upward that is formed on the lower end surface of the first end plate portion (45a) of the front upward that is formed on the lower end surface of the first end plate portion (45a) of the front

head (45) head (45) and the second and the recess (62) second recess (62) recessed recessed downward thatis downward that is formed onthe formed on the upper upper end end surface surface

of the cylinder (41). of the cylinder (41).

[0124]

In the In the compressor (100)ofofeach compressor (100) eachembodiment, embodiment,thethe cavity cavity (51) (51) of of themuffler the muffler(50) (50)may may

be constituted only by the internal space of the through hole (63) formed in any of the members be constituted only by the internal space of the through hole (63) formed in any of the members

11, 11, the the cavity cavity (51) (51) may be formed may be formedbybythe thethrough throughhole hole(63) (63)penetrating penetratingthe thefront fronthead head(45) (45)inin

the top-bottom direction. If the through hole (63) constituting the cavity (51) is formed in the the top-bottom direction. If the through hole (63) constituting the cavity (51) is formed in the

front head as illustrated in FIG. 11, the upper opening of the through hole (63) is closed by the front head as illustrated in FIG. 11, the upper opening of the through hole (63) is closed by the

cover member cover member (47). (47).

34

[0125]

In the In the compressor (100)ofofeach compressor (100) eachembodiment, embodiment,the the compression compression mechanism mechanism (40) (40) may may

further further include include aa cavity cavity formation formation member constitutingthe member constituting thecavity cavity(51) (51)ofofthe the muffler muffler(50). (50). In In

other words, other the cavity words, the cavity (51) (51) may maybebeformed formed by by a member a member otherother than than the front the front head head (45),(45), the the

cylinder (41), cylinder (41), and the rear and the rear head (46). The head (46). cavity formation The cavity formationmember memberis, is, forfor example, example, a plate- a plate-

shapedmember shaped memberandand is disposed is disposed so to SO as as to cover cover part part of of thethe side side surfaceofofthethefront surface fronthead head(45). (45).

Thecavity The cavity (51) (51) is is formed inside the formed inside the cavity cavity formation formation member. member. AAthrough throughhole holeisisformed formedononthe the

side surface of the cavity formation member and constitutes the first opening (53). side surface of the cavity formation member and constitutes the first opening (53).

[0126]

Themuffler The muffler(50) (50)ofof each eachembodiment embodiment is applied is applied to to a one-cylinder a one-cylinder rotary rotary compressor compressor

but may but beapplied may be appliedtoto aa two-cylinder two-cylinder rotary rotary compressor. compressor.

[0127]

Themuffler The muffler(50) (50)ofofeach eachembodiment embodiment may may be applied be applied to a compressor to a compressor othera other than than a

rotary compressor. rotary compressor.

[0128]

Whilethe While theembodiment embodimentand and variations variations thereof thereof havehave beenbeen described described above, above, it will it will be be

understoodthat understood that various various changes changesininform formand anddetails detailsmay maybe be made made without without departing departing fromfrom the the

spirit and spirit and scope of the scope of the claims. claims. The embodiments, The embodiments, thethe variations,and variations, and theother the otherembodiments embodiments

maybebecombined may combinedandand replaced replaced with with each each other other without without deteriorating deteriorating intended intended functions functions of of thethe

present disclosure. present disclosure.

[0129]

The ordinal numbers such as “first,” “second,” “third,” . . . , described The ordinal numbers such as "first," "second," "third," described above , aboveare are used used

to distinguish to distinguish the theterms terms to towhich which these these expressions expressions are are given, given, and and do do not not limit limitthe thenumber number and and

order of the terms. order of the terms.

35

2023244064 22 Oct 2024

[0129a]

The term "comprise" and variants of that term such as "comprises" or "comprising" are

used herein to denote the inclusion of a stated integer or integers but not to exclude any other

5 integer or any other integers, unless in the context or usage an exclusive interpretation of the 2023244064

term is required.

INDUSTRIAL APPLICABILITY

[0130]

As described above, the present disclosure is useful for a compressor and a

10 refrigeration apparatus.

DESCRIPTION OF REFERENCE DESCRIPTION OF REFERENCECHARACTERS CHARACTERS

[0131]

11 Refrigeration Apparatus

15 15 10 Casing

16 16 Reservoir

20 20 Electric Electric Motor Motor

40 Compression Mechanism

41 Cylinder

20 20 45 Front Head (First Closing Member)

46 46 Rear Head (Second Closing Member)

50 50 Muffler

50a First Muffler

50b Second Muffler

25 25 51 51 Cavity

2023244064 22 Oct 2024

52 52 First Communication Passage

53 53 First Opening

54 54 Second Communication Passage

5 55 Second Opening 5 55 2023244064

61, 62 Recess Recess

63 63 Through Hole

100 100 Compressor

E1 E1 First FirstMember Member

10 10 E2 E2 Second Second Member Member

E3 E3 Third Third Member Member

R R Resonance Chamber Resonance Chamber

S S Refrigerant Space

A1 Initial Supply Position

37

Claims

CLAIMS 16 Feb 2026

[Claim 1] A compressor including:

a casing having a bottom portion in which a reservoir configured to store oil is

5 provided;

an electric motor housed in the casing; 2023244064

a compression mechanism disposed between the electric motor and the reservoir and

configured to compress sucked gas refrigerant and discharge the compressed gas refrigerant

into the casing; and

10 a resonance muffler provided in the compression mechanism,

wherein

in the casing, a refrigerant space through which the gas refrigerant discharged from the

compression mechanism flows is formed above the reservoir,

the muffler includes

15 a cavity in which a resonance chamber is formed, and

a first opening communicating with the resonance chamber and opening to

the refrigerant space, and

the first opening is formed on a lower surface of the compression mechanism or on an

outer peripheral surface of the compression mechanism.

20
[Claim 2] The compressor of claim 1, wherein

the muffler further includes a first communication passage communicating with the

resonance chamber, and

the first opening is formed at an end portion of the first communication passage.

25
[Claim 3] The compressor of claim 1 or 2, wherein 16 Feb 2026

the compression mechanism includes a plurality of members arranged so as to overlap

with each other,

the plurality of members includes a first member,

5 the first member includes a recess formed at an end surface of the first member in a

direction in which the plurality of members overlap with each other, and 2023244064

an internal space of the recess constitutes part of the cavity.
[Claim 4] The compressor of any one of claims 1 to 3, wherein

10 the compression mechanism includes a plurality of members arranged so as to overlap

with each other,

the plurality of members includes a second member,

the second member includes a through hole penetrating the second member in a

direction in which the plurality of members overlap with each other, and

15 an internal space of the through hole constitutes part of the cavity.
[Claim 5] The compressor of any one of claims 1 to 4, wherein

the compression mechanism includes

a cylinder,

20 a first closing member configured to cover an opening surface of one end of

the cylinder in an axial direction, and

a second closing member configured to cover an opening surface on another

end of the cylinder in the axial direction, and

the cavity is formed by at least one of the cylinder, the first closing member, or the

25 second closing member.
[Claim 6] The compressor of any one of claims 1 to 5, wherein

the first opening is formed on the outer peripheral surface of the compression

mechanism, and

5 the muffler further includes a second opening which communicates with the cavity and

through which the oil flows in and out, and 2023244064

the second opening is formed below the first opening.
[Claim 7] The compressor of claim 6, wherein

10 the first opening is formed below an initial supply position which is a position of an

oil surface in the reservoir reached at a time of shipment, and communicates with the refrigerant

space when an oil level in the reservoir lowers.
[Claim 8] The compressor of claim 6, wherein

15 the muffler further includes a second communication passage communicating with the

cavity, and

the second opening is formed at an end portion of the second communication passage.
[Claim 9] The compressor of claim 6, wherein

20 the compression mechanism has a plurality of members overlapping with each other,

the plurality of members includes a third member which is a lowermost one of the

plurality of members,

the cavity is formed in the third member, and

the second opening is formed on a lower surface of the third member.

25
[Claim 10] The compressor of any one of claims 1 to 9, wherein 16 Feb 2026

the muffler includes a first muffler and a second muffler,

the first opening of the first muffler is formed below the first opening of the second

muffler, and

5 a resonance frequency of the first muffler is lower than a resonance frequency of the

second muffler. 2023244064
[Claim 11]

A refrigeration apparatus including: the compressor of any one of claims 1 to 10.

10

Daikin Industries, Ltd

Patent Attorneys for the Applicant/Nominated Person

SPRUSON & FERGUSON