JP2803471B2 - Oil supply device for hermetic rotary compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil supply device for a hermetic rotary compressor used for equipment such as an air conditioner or a refrigerator.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a cross-sectional view showing a horizontal rotary compressor in which a conventional oil supply device for a hermetic rotary compressor disclosed in Japanese Patent Application Laid-Open Publication No. H10-209,813 is used. FIG. 5 is a sectional view showing a main part of the oil supply device of the hermetic rotary compressor. In the figure, reference numeral 1 denotes a shell as a hermetic container having an oil reservoir 2 at its bottom, and a cylinder forming a shell peripheral wall. A body 3 and a lid 4 for closing the opening of the cylindrical body 3, and a compression mechanism 5 is fitted and fixed in the shell 1.

Reference numeral 6 denotes a main shaft which is rotated by a motor 7 and is provided in the shell 1 and has a first oil passage 8 extending in the axial direction and a second oil passage 9 opening in the radial direction. Are formed. Reference numeral 10 denotes a cylindrical joint having a through hole 11 that opens in the radial direction, and is connected to the lower end of the main shaft 6 so as to communicate with the first oil passage 8 and opens downward at the lower end. A notch 12 is provided.

[0004] Reference numeral 13 denotes a positive displacement oil pump composed of, for example, a trochoid pump, which is connected to the lower end of the joint 10 and is rotatably housed in a pump housing 14. The portion is provided with a projection 16 having a rectangular cross section that fits into the notch 11. The oil pump 13 is configured to forcibly supply oil to each bearing (sliding portion of the compression mechanism 5) via the first oil passage 8 and the second oil passage 9 during operation of the compressor. ing.

A pump housing 14 for accommodating the oil pump 13 is screwed to the stator 7a of the motor 7 and is eccentric to the axis of the main shaft 6 to form a pipe 17 for oil suction.
A first housing 19 having a band-shaped U-shape having an insertion hole 18 through which the oil pump 13 is inserted, and a second housing 20 held by the first housing 19 and connected to the pipe 17 to rotatably support the oil pump 13. , A bottomed cylindrical third housing 21 provided around the second housing 20 and fixed to the first housing 19.

The second housing 20 is provided with a hemispherical projection 23 which abuts against the flat surface 22 of the first housing 19, and a thrust between the second housing 20 and the third housing 21. A spring 24 for generating a force is mounted. The second housing 20 includes a first housing 20a having a through hole 25 that is inserted through the third housing 21 and faces a part of the joint 10, and a pipe provided below the first housing 20a. A second housing 20b having an oil suction port 26 communicating with the body 17, and a third housing 20c having an oil discharge port 27 provided between the second housing 20b and the first housing 20a. A pump chamber (not shown) of the oil pump 13 is formed by the third housing 20c and the second housing 20b. The second housing 20b and the third housing 20c are provided with a rotation stopper. Pins 28 and 29 are provided.

Next, the operation will be described. Arrow A in FIG.
When the main shaft 6 (see FIG. 6) is rotated by the motor 7 in the direction shown by the arrow, the joint 10 also rotates in the same direction, and the oil pump 13 is driven, so that forced sliding is performed on each sliding portion (each bearing). That is, the oil reservoir 2 from the tube 17 as indicated by broken line arrows is sucked into the second housing 20 in FIG. 5
The oil in (see FIG. 6) sequentially passes through the joint 10 and the main shaft 6 and is forcibly supplied to each sliding portion (bearing) of the compression mechanism 5.

[0008]

The conventional lubricating apparatus for a hermetic rotary compressor is constructed as described above. Therefore, the only means for restricting the axial direction of the second housing 20 is the thrust force of the spring 24. Therefore, the thrust force of the spring 24 must be increased. This necessitates poor assembly workability. Also, the second housing 20
(b) The third housing 20c has to be enlarged in the radial direction in order to house the pins 28 and 29 for stopping rotation, and there is a problem that the oil supply device becomes large accordingly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and reduces the thrust force of a spring, which is a means for regulating the axial direction of a second housing of an oil supply device in a hermetic rotary compressor. The object of the present invention is to provide a compact oil-filled rotary compressor lubricating device which improves assembly workability and eliminates pins for stopping rotation, thereby eliminating space for installing pins and improving assembly workability. And

[0010]

According to the present invention, there is provided an oil supply device for a hermetic rotary compressor according to the present invention, comprising: a hermetic container having an oil reservoir at a bottom portion; a main shaft rotated by a motor provided in the hermetic container; A compression mechanism connected to the main shaft for compressing fluid, a pump for forcibly supplying oil to each bearing supporting the main shaft, a first housing having an insertion hole through which a tube for oil suction is inserted, and a plurality of housings. A second housing or the like, wherein the second housing is held in the first housing so as to be adjustable in the axial direction and the radial direction of the main shaft. A plurality of concave grooves are provided along the axial direction on the outer surface of the housing so that the body can be positioned, and a stopper for regulating the axial direction, the radial direction, and the rotation direction is provided in the groove. A first bent portion having both ends bent toward the center of the shaft at the step portion of the housing so that the first bent portion can be fitted to the outer surfaces of the plurality of housings so as to be fitted to the outer surfaces thereof; A second bent portion that is bent in the axial direction such that a tip end of the portion comes into contact with an outer surface of the uppermost housing; and an outer peripheral surface and a lowermost portion of the plurality of housings from the second bent portion. Using a plate-shaped elastic member having a third bent portion formed along the bottom surface of the housing and bent toward the center of the axis at the bottom surface of the housing, further comprising a spring member And the second bent portion is pressed against the outer surface of the uppermost housing.

[0011]

[0012]

[0013]

The lubricating device for a hermetic rotary compressor according to the present invention regulates the axial direction, the radial direction and the rotational direction of the second housing by providing a stopper in the second housing comprising a plurality of housings. can do. Also, the second housing can be assembled in advance.

Further, a plate-like elastic member having a bent portion whose both ends are bent at the center of the shaft so as to be fitted on the outer surface side of the plurality of combined housings and locked therewith is provided on the second housing. By using a plurality of stoppers for regulating the axial direction, the radial direction, and the rotational direction, a plurality of housings can be simultaneously pressed down in the axial direction and the radial direction, and the second housing can be assembled in advance. Also,
Since the rotation direction is regulated, it is not necessary to provide a pin for stopping rotation as in the related art in the second housing.

A first bent portion having both ends bent toward the center of the shaft so as to be fitted to the outer surface side of the plurality of combined housings and locked, and a tip of the first bent portion. a second bent portion which part is bent in the axial direction so as to contact the outer surface of the top of the housing, integral along the bottom surface of the outer peripheral surface and the bottom of the housing of the plurality of housing from the bent portion of said end A plate-like elastic member having a third bent portion formed by bending is formed as a stopper for regulating the axial direction, the radial direction, and the rotation direction of the second housing. In addition, it is possible to prevent the stopper from coming off the second housing even when the exciting force acts.

[0016]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. Note that the same reference numerals are used for parts common to the above-described conventional configuration. According to FIG. 1 and FIG.
Each of the first housing 20a, the second housing 20b, and the third housing 20c constituting the second housing 20 is provided along the axial direction at the same position in the radial direction and has a concave groove. is there. Reference numerals 32 and 33 denote plate-like elastic members which are stoppers inserted into the concave grooves 30 and 31, respectively. The plate-like elastic members 32 and 33 are bent at the opposite ends of the concave grooves 30 and 31 toward the axial center side.
3a and 33b are provided. This plate-like elastic member 3
2, 33 are the bent portions 32a, 32b, 33a,
The first housing 20a and the third housing 20c are fixed so as to be pressed in the axial direction by 33b.

In the lubricating device for the hermetic rotary compressor constructed as described above, the plate-like elastic members 32 and 33 are inserted and fixed in the concave grooves 30 and 31, respectively.
Housing 20a, second housing 20b, and third housing 2
0c is pressed in the axial and radial directions. Therefore, the second housing 20 can be assembled in advance,
The work of assembling the second housing 20 in the third housing 21 can be eliminated, and the axial restriction by only the thrust force of the spring 24 is eliminated.
And the assembling workability can be improved, such as a reduction in thrust force.

Further, since the rotation direction is restricted, the pins 28 and 29 (see FIG. 5) for stopping rotation are connected to the second housing 20.
It is not necessary to provide them inside. Therefore, the pin 2
It is no longer necessary to secure a space in the radial direction for providing 8, 29, and the second housing 20 can be made smaller in the radial direction, so that the third housing 21 and the like can be similarly made smaller. Become compact.

Further, since the concave grooves 30, 31 are asymmetric with respect to the axis center, the first housing 20a, the second housing 20b, and the third housing 20c are always in the same direction only. Cannot be assembled, for example, the second housing 20
Only b is mounted by being rotated by 180 °, so that mistakes such as overlapping of the oil inlet 26 and the oil outlet 27 are prevented. Further, the elastic force of the plate-like elastic members 32 and 33 causes
Assembly errors during assembly can be absorbed.

Embodiment 2 FIG. In the first embodiment, the plate-like elastic members 32 and 33 are inserted and fixed in the concave grooves 30 and 31, respectively. However, as shown in FIGS. The plate-like elastic member 34
The elastic members 32 and 33 are integrally connected.

That is, the elastic member 34 of this embodiment is
Inserted into the concave grooves 30, 31 and the concave grooves 3
0, 31 are connected in the space defined by the lower end of the second housing 20b side and the first housing 19, and at the end of the concave grooves 30, 31 on the first housing 20a side. First bent portions 35, 36 formed on the axis center side, second bent portions 35a, 36a in the direction of the main axis (not shown) along the axial direction of the first housing 20a, The first, second, and third housings 2 are bent from the bent portions 35 and 36.
A third bend formed integrally with the outer peripheral surfaces of the first and second housings 0a, 20b, and 20c and the bottom surface of the third housing 20c.
And a bent portion 37. The second bent portions 35a and 36a are connected to the first housing 20.
a and a spring 24 in the radial direction.

The lubricating device for a hermetic rotary compressor according to the second embodiment configured as described above has the same effects as the first embodiment, and the first embodiment has the joint 1
When the excitation force generated by the rotation of 0 is transmitted to the second housing 20, the plate-like elastic members 32 and 33 may move in the radial direction due to the interference with the spring 24 and come off the concave grooves 30 and 31. However, in the present embodiment, the plate-shaped elastic member 34 is configured not to move in the radial direction without fail.
Can be prevented from coming off from the concave grooves 30 and 31.

[0023]

The lubricating device for a hermetic rotary compressor according to the present invention has a stepped portion on the casing as a stopper so that the stopper can be fitted on the outer surface of the combined casings and locked. A first bent portion whose both ends are bent toward the center of the shaft, and a second bent portion which is bent in the axial direction such that the tip of the first bent portion comes into contact with the outer surface of the uppermost housing. A bent portion and the second
And a third bent portion formed along the outer peripheral surface of the plurality of housings and the bottom surface of the lowermost housing from the bent portion and bent toward the center of the axis at the bottom surface of the housing. Since the second bent portion is pressed against the outer surface of the uppermost housing by a spring member, a plurality of housings are driven by a refueling pump. Even when a radial external force or a rotational external force acts on the elastic member, the elastic member does not come off the housing, and the displacement of the plurality of housings can be prevented. In addition, since only one regulating member is required, the assemblability is good.

Further, by using a plurality of plate-like elastic members having bent portions whose both ends are bent as stoppers for regulating the axial, radial and rotational directions of the second housing, a plurality of housings are provided. Can be simultaneously pressed in the axial direction and the radial direction.
The housing can be assembled. In addition, since the rotation direction is restricted, it is not necessary to provide a rotation stop pin in the second housing as in the related art. Therefore, there is no need to provide a space in the radial direction.

Further, a plate-like elastic member integrally bent from the bent portions at both ends along the outer peripheral surfaces of the plurality of housings and the bottom surface of the lowermost housing is formed in the axial direction and the radial direction of the second housing. In addition, by providing the stopper that regulates the rotation direction, the same effect as described above can be obtained, and the stopper can be prevented from coming off the second housing even when an exciting force acts.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an oil supply device of a hermetic rotary compressor showing a first embodiment of the present invention.

FIG. 2 is a bottom view of the oil supply device of the hermetic rotary compressor in FIG.

FIG. 3 is a sectional view of an oil supply device of a hermetic rotary compressor showing a second embodiment of the present invention.

FIG. 4 is a bottom view of an oil supply device of the hermetic rotary compressor in FIG.

FIG. 5 is a cross-sectional view of a conventional oil supply device for a hermetic rotary compressor.

FIG. 6 is a cross-sectional view showing an example in which a conventional oil supply device is applied to a hermetic rotary compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container (shell) 2 Oil reservoir 5 Compression mechanism 6 Main shaft 7 Motor 10 Joint 13 Oil pump 19 1st housing 20 2nd housing 20a 1st case 20b 2nd case 20c 3rd case 32 Plate shape Elastic member 33 plate-shaped elastic member 34 plate-shaped elastic member 35 first bent portion 36 first bent portion 35a second bent portion 36b second bent portion 37 third bent portion

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-157493 (JP, A) JP-A-2-101083 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04C 29/02 311

Claims (1)

(57) [Claims] 1. A closed container having an oil reservoir at the bottom, a main shaft rotated by a motor provided in the closed container, a compression mechanism connected to the main shaft for compressing fluid, and bearings for supporting the main shaft. , A first housing having an insertion hole through which an oil suction pipe is inserted, a second housing including a plurality of housings, and the like.
In the oil supply device of the hermetic rotary compressor in which the second housing is held in the axial direction and the radial direction of the main shaft with respect to the first housing so as to be adjustable, a plurality of housings can be positioned. along the outside of the housing surface in the axial direction, a concave groove is provided, the axial in this groove, Rutotomoni provided a stop for restricting the radial and rotational directions, and stop
And externally fitted to the outer surface side of the plurality of housings thus combined.
Both ends are bent toward the center of the shaft at the housing step so that they can be locked
The first bent portion and the tip portion of the first bent portion
Folds axially to abut outer surface of top case
The second bent portion, and the second bent portion
Along the outer surface of multiple housings and the bottom of the bottom housing
And folded at the bottom of the housing toward the axis center.
An integral, plate-shaped bullet having a bent third bent portion
The second bent portion using a spring member.
Is pressed against the outer surface of the uppermost housing .