JP3060625B2 - Hermetic compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compression element and a motor arranged inside a closed casing.
The present invention relates to a hermetic compressor in which a so-called positive displacement oil pump having a pump rotor and a pump yoke at the end of a drive shaft is mounted while releasing suction gas into a lower chamber of a motor.

[0002]

2. Description of the Related Art Conventionally, an apparatus in which suction gas is released to a lower chamber of a motor is disclosed in, for example, Japanese Utility Model Laid-Open No. 1-105780.
Japanese Patent Application Laid-Open No. HEI 3-88995 discloses an apparatus in which a positive displacement oil pump is attached to an end of a drive shaft.

[0003] Thus, when the two technologies are combined,
As shown in FIG.
, A suction pipe L is opened therein, and the suction gas is allowed to flow through an air gap G of the motor M to cool the motor M. In addition, a pump rotor R And a pump yoke Y, a thrust seat S, and an oil supply pump P having an oil suction pipe T. A fixed amount of oil corresponding to the volume of the pump chamber C defined by the pump rotor R and the yoke Y is supplied to the inside of the drive shaft D. It can be considered that stable oiling can be ensured by pumping the oil into the oiling passage Q provided in.

[0004]

However, in the structure shown in FIG. 4 according to the above combination, the yoke working chamber a for the sliding movement of the pump yoke Y is provided on the inner side of the bearing boss of the lower housing H. To close the pump chamber C
Gas and oil leaking from the yoke operating chamber a accumulate in the yoke operating chamber a, and the internal pressure of the yoke operating chamber a increases. In addition, there is a possibility that a problem arises in that the oil flow path has a reverse differential pressure, so that the oil cannot be pumped well into the oil supply passage Q.

In this case, as shown by an imaginary line in FIG. 4, a gas vent hole b which opens outward is formed at the center of the drive shaft D, and the pressure in the oil supply passage Q which is the outlet side of the pump rotor R is increased. Although it is conceivable that the lower chamber of the motor M is defined by the lower housing H inside the closed casing and the suction gas flows through the air gap G of the motor M, Since the pressure in the lower chamber of the motor M tends to be higher than the internal pressure, the state of the reverse differential pressure between the oil suction pipe T and the oil supply passage Q is not eliminated at all, and therefore, such a gas vent hole b Is not effective.

Further, by increasing the length of the drive shaft D, the mounting position of the pump rotor R and the pump yoke Y is positioned below the bottom surface of the lower housing H, and the side of the yoke working chamber a is Can be opened to the inside of the closed casing, but in such a case, there is a problem that the entire compressor becomes long and the structure becomes large.

According to the present invention, the motor can be cooled by the suction gas without providing a gas vent hole or increasing the length of the drive shaft, but the reverse pressure difference between the oil suction pipe and the oil supply passage is maintained. It is an object of the present invention to provide a hermetic compressor capable of eliminating sticking and ensuring good lubrication.

[0008]

In order to achieve the above object, the present invention provides a motor 90 in which a compression element 78 is connected to the upper part of a closed casing 5 having an oil reservoir 50 at the bottom, and a drive shaft 9 is connected to the lower part. , Respectively, and below the motor 90
A lower housing 6 is disposed at one end, and
A lower chamber is formed which is separated from the internal space. A suction pipe 54 is opened in the lower chamber . A pump rotor 1 and a pump yoke 2 fitted to an outer peripheral portion of the rotor 1 are provided below the drive shaft 9. A thrust receiving seat 3 fixed to a lower portion of the lower housing 6, and an oil suction pipe 4 for sucking oil from the oil reservoir 50, and an oil supply pump 100 for pumping oil to an oil supply passage 92 provided inside the drive shaft 9. Hermetic compressor equipped with
, The cable is fixed to the lower housing 6 and
The plate-like member 62 supported on the inner peripheral surface of the thing 5
A closed yoke formed on the outer periphery of the pump yoke 2
The working chamber 23 is provided with a pressure equalizing hole 24 provided in the thrust seat 3.
Through the lower chamber to the oil sump space partitioned from the lower chamber.
Was.

[0009]

The motor 90 can be cooled by releasing the intake gas to the lower chamber , but even if gas or oil leaks into the yoke operating chamber 23, the yoke operating chamber 23 passes through the pressure equalizing hole 24 to close the closed casing 5. because they passed through the communication with the oil reservoir side space, Gyakusa圧between the internal pressure of the yoke working chamber 23 without increasing, the oil supply passage 92 side and the oil suction pipe 4 comprising an outlet side of the pump rotor 1 Can be prevented, and stable refueling can be ensured.

[0010]

FIG. 3 shows a scroll type hermetic compressor having a body 51, a top 52 and a bottom 53.
A fixed scroll 7 having a spiral plate 72 projecting from a head plate 71 and a movable scroll 8 having a spiral member 82 projecting from a mirror plate 81 are provided above the closed casing 5 having an oil reservoir 50 at the bottom.
And a compression element 78 having a stator 90a and a rotor 90b below the compression element 78.
A motor 90 having a drive shaft 9 coupled to the motor shaft 0b is internally provided.

At the lower part of the motor 90, a cylindrical member 61 fixed to the lower end of the upper housing 60 with bolts 60a.
And a plate-like member 62 fixed to the bottom surface thereof with bolts 60b. A lower housing 6 having a lower bearing boss 61b is provided at the center of the cylindrical member 61 via a rib 61a. 6, the lower chamber of the motor 90 is defined with respect to the internal space of the casing 5.

Then, a suction pipe 54 is opened inside the lower housing 6, and a suction gas is opened to a lower part of the motor 90.
4, the air gap 91a between the stator 90a and the rotor 90b in the motor 90 and the stator 90a
After passing through the outer peripheral gap 91b of the spiral to cool the motor 90, it is taken into the compression chamber 73 defined between the spiral bodies 72 and 82 from the spiral outer peripheral side, and discharge gas after compression is swirled at the central part of the spiral. Through the discharge chamber 55 and the oil separator 56 from the discharge port 57 to the outside.

The drive shaft 9 is provided below the drive shaft 9.
An oil supply pump 100 for pumping oil is mounted in an oil supply passage 92 formed of first and second oil supply holes 92a and 92b provided in the inside, and a metal bearing 93 interposed in a lower bearing boss portion 61b and an upper housing 60 are provided. The lubricating oil is supplied to the radial bearing 94 and the thrust bearing 95, the pin bearing 83 for fitting the movable scroll 8, the sliding groove of the Oldham ring 96 serving as a rotation preventing mechanism, and the compression chamber 73. I have to.

The refueling pump 100 is constructed as shown in FIGS. 1 and 2 and comprises the following four parts.

A. Boss part 1 to be inserted into lower end of drive shaft 9
1, a flange 12 which is slidably engaged with the lower end of the drive shaft 9 via pins 97 and 98, and an eccentric portion 13 having an axis eccentric with respect to the drive shaft 9. A pump rotor 1 having a suction path 14, an oil discharge path 15, and an inversely tapered centrifugal pump section 16, and a downwardly biasing spring 17 disposed at an upper portion.

B. A yoke main body 21 having a long hole 20 in which two semicircles are connected by a straight line portion at a center portion and fitted to an outer peripheral portion of the eccentric portion 13 to define the pump chamber 10, and the bearing boss in the lower housing 6. A pump yoke 2 integrally provided with a pair of keys 22 extending in the short axis direction to slide in key grooves 65 provided in a lower portion of the portion 61b.

C. A thrust seat comprising an annular thrust plate 31 and a thrust support 32 disposed on the back surface thereof, fixed to the lower portion of the lower bearing boss portion 61b via a bolt 33, and receiving the bottom surfaces of the pump rotor 1 and the pump yoke 2. 3.

D. The oil suction passage 14 of the pump rotor 1 is provided at the upper end.
A straight pipe portion 41 having a connection port 4a opening at the bottom, and a curved pipe portion 42 having a suction port 4b opening at the lower end of the oil reservoir 50,
Insertion hole 3 provided with straight pipe portion 41 in thrust support 32
2a, is rotatably inserted into 2a, and is interposed between an annular groove 32b provided at the lower part of the thrust support 32 and a closing plate 32c for closing the bottom at the middle of the straight pipe portion 41. And an oil suction pipe 4 provided with a restricting body 43 having a minute gap of about several millimeters between the end faces of the straight pipe portion 41 and the pump rotor 1.

With the above configuration, the thrust plate 31 and the thrust support 32 constituting the thrust seat 3 are provided with:
The inner side of the lower bearing boss 61a and the thrust plate 31
A pressure equalizing hole 24 formed of a first hole 24a and a second hole 24b for communicating the yoke working chamber 23 defined between the upper surface of the casing 5 and the internal space of the casing 5 is formed.

Thus, even if gas or oil leaks from the pump chamber 10 to the yoke operating chamber 23, the yoke operating chamber 23 is communicated with the inside of the closed casing 5 through the pressure equalizing hole 24. The pressure inside the oil supply passage 9 on the outlet side of the pump rotor 1 does not increase.
The pressure on the second side is increased with respect to the suction port 4b of the oil suction pipe 4, so that it is possible to prevent the occurrence of a reverse differential pressure beforehand, and to secure a stable oil supply.

In addition, although the structure is such that the suction gas is released into the inside of the lower housing 6 to cool the motor 90, the length of the drive shaft 9 is increased and the mounting position of the refueling pump 100 is changed to the bottom surface of the lower housing 6. , The overall structure is small, and furthermore, since there is no drive shaft 9 provided with a gas vent hole, the oil supply path and the suction gas path can be reliably separated, and It is possible to reduce the amount of oil mixed in, to prevent excessive oil supply to the compression chamber 73, and to reduce the so-called oil rising amount flowing out from the discharge pipe 57 to the outside.

In the above configuration, reference numeral 1 in FIG.
Reference numeral 8 denotes a cylindrical protruding wall for preventing dust mixed in the oil from entering the thrust plate 31, and reference numeral 19 denotes an annular dust reservoir.

[0023]

As described above, according to the present invention, although the motor 90 can be cooled by the suction gas, the reverse differential pressure between the oil supply passage 92 on the outlet side of the pump rotor 1 and the oil suction pipe 4 is maintained. Generation can be prevented, and stable refueling can be secured.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a hermetic compressor according to the present invention.

FIG. 2 is a bottom view of the oil pump.

FIG. 3 is a sectional view of the entire compressor.

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump rotor 2 Pump yoke 3 Thrust seat 4 Oil suction pipe 5 Sealed casing 6 Lower housing 9 Drive shaft 23 Yoke working chamber 24 Equalizing hole 50 Oil reservoir 54 Suction pipe 78 Compression element 90 Motor 92 Oil supply passage 61b Lower bearing boss 100 Refueling pump

Continuation of the front page (56) References JP-A-3-88995 (JP, A) JP-A-3-18695 (JP, A) JP-A-63-90685 (JP, A) JP-A-63-90684 (JP) , A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04B 39/02 F04C 23/00-29/10 331

Claims (1)

(57) [Claims] 1. A closed casing 5 having an oil reservoir 50 at the bottom.
Below into the compression element 78 at the top, respectively furnished the motor 90 coupled to drive shaft 9 in its lower, under end of the motor 90
The housing 5 is disposed so that the internal space of the casing 5 is empty.
A lower chamber is formed to be separated from the space, and the suction pipe 54
A pump rotor 1 and a pump yoke 2 fitted on an outer peripheral portion of the rotor 1 below the drive shaft 9.
An oil supply pump that includes a thrust seat 3 fixed to a lower portion of the lower housing 6 and an oil suction pipe 4 that suctions oil from the oil reservoir 50, and pumps oil to an oil supply passage 92 provided inside the drive shaft 9. hermetic compressor odor fitted with 100
And fixed to the lower housing 6,
By the plate member 62 supported on the inner peripheral surface, the pump
Yoke working chamber 23 in a closed state formed on the outer periphery of
Through a pressure equalizing hole 24 provided in the thrust seat 3.
A hermetic compressor characterized by being open to an oil sump space separated from the lower chamber .