JPH0610869A - Lubricating device for closed type rotary compressor - Google Patents

Abstract

PURPOSE:To attain compactness while improving assembly workability by providing a stopping fixture for restricting an axial direction, diametric direction and a rotational direction in the second housing. CONSTITUTION:Hollow-shaped grooves 30, 31 are provided in a diametric direction in the same position along an axial direction, of the first, second and third case bodies 20a, 20b, 20c of respectively constituting the second housing. Plate- shaped elastic members 32, 33, which are stopping fixtures, are inserted respectively to the hollow-shaped grooves 30, 31. Fold parts 32a, 32b, 33a, 33b toward an axial center side in both end parts of the hollow-shaped grooves 30, 31 are provided in the plate-shaped elastic members 32, 33. The plate-shaped elastic members 32, 33 are fixed so as to press the first/third case bodies 20a, 20c in the axial direction by the fold parts 32a, 32b, 33a, 33b. In this way, compactness can be attained while improving assembly workability.

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 in equipment such as an air conditioner or a refrigerator.

[0002]

2. Description of the Related Art FIG. 6 shows, for example, JP-A-2-157493.
FIG. 6 is a cross-sectional view showing a horizontal rotary compressor that implements the conventional oil supply device for a hermetic rotary compressor disclosed in the publication. FIG. 5 is a cross-sectional view showing an essential part of the oil supply device for the hermetic rotary compressor described above. In the figure, 1 is a shell as an airtight container having an oil sump 2 at the bottom thereof, and a cylinder forming a shell peripheral wall. It comprises a body 3 and a lid 4 that closes 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 which 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 therein. Are formed. Reference numeral 10 denotes a cylindrical joint having a through hole 11 opening in the radial direction, which 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 cutout 12 is provided.

Reference numeral 13 denotes a positive displacement oil pump which is, for example, a trochoid type pump, which is connected to the lower end of the joint 10 and is rotatably housed in a pump housing 14 and the center of the upper end of a pump drive shaft 15. The portion is provided with a protrusion 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 (a sliding portion of the compression mechanism 5) via the first oil passage 8 and the second oil passage 9 when the compressor is operating. ing.

A pump housing 14 for accommodating the oil pump 13 is screwed to a stator 7a of the motor 7 and is eccentric to the shaft center of the main shaft 6 so that a pipe body 17 for oil intake is formed.
A first housing 19 having a U-shaped band 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 body 17 to rotatably support the oil pump 13. The third housing 21 is provided around the second housing 20 and is fixed to the first housing 19 and has a bottomed cylindrical third housing 21.

Of these, the second housing 20 is provided with a hemispherical protrusion 23 which comes into contact with the flat surface 22 of the first housing 19, and the thrust is provided between the second housing 20 and the third housing 21. A spring 24 for generating force is mounted. The second housing 20 is provided below the first housing 20a and a first housing 20a having a through hole 25 which is inserted into the third housing 21 and through which a part of the joint 10 faces. A second casing 20b having an oil suction port 26 communicating with the casing 17, and a third casing 20b provided between the second casing 20b and the first casing 20a and having an oil discharge port 27. The third housing 20c and the second housing 20b form a pump chamber (not shown) of the oil pump 13, and the second housing 20b and the third housing 20c The housing 20c is provided with rotation stopping pins 28 and 29 therein.

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 indicated by, the joint 10 is also rotated in the same direction, the oil pump 13 is driven, and each sliding portion (each bearing) is forcibly lubricated. That is, as shown by the broken line arrow in FIG. 5, the pool 2 sucked from the pipe body 17 into the second housing 20.
The oil inside (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 oil supply device for a hermetic rotary compressor is constructed as described above. Therefore, since the means for restricting the axial direction of the second housing 20 is only the thrust force of the spring 24, the thrust force of the spring 24 must be strong, and the force against the thrust force of the spring 24 is required during assembly work. Needed and assembly workability deteriorates. In addition, the second housing 20
b, the third casing 20c must be enlarged in the radial direction in order to internally install the rotation stopping pins 28 and 29, and there is a problem that the oil supply device becomes large accordingly.

The present invention has been made to solve the above problems, and reduces the thrust force of a spring, which is a means for axially restricting the second housing of an oil supply device in a hermetic rotary compressor. The purpose of the present invention is to provide an oil supply device for a compact hermetic rotary compressor that improves the assembly workability and eliminates the rotation stopper pin to save space because the pin is internally provided and improves the assembly workability. And

[0010]

SUMMARY OF THE INVENTION An oil supply device for a hermetic rotary compressor according to the present invention comprises a hermetic container having an oil sump at the bottom, a main shaft provided in the hermetic container and rotated by a motor, and the main shaft. A compression mechanism for compressing fluid, a pump for forcibly supplying oil to each bearing that supports the main shaft, a first housing having an insertion hole through which a pipe for oil suction is inserted, a first housing and a first housing. A hermetically sealed type including a second housing including a second housing and a third housing, and the second housing held so as to be adjustable relative to the first housing in the axial direction and the radial direction of the main shaft. In the oil supply device for a rotary compressor, the second housing is provided with a stopper that restricts the axial direction, the radial direction, and the rotation direction.

Also, a closed container having an oil sump at the bottom,
A main shaft provided in the closed container and rotated by a motor, a compression mechanism connected to the main shaft for compressing a fluid, a pump for forcibly supplying oil to each bearing supporting the main shaft, and an oil suction pipe body are inserted. The main housing includes a first housing having an insertion hole, a second housing including a first housing, a second housing, and a third housing, and the second housing has the main shaft with respect to the first housing. In an oil supply device for a hermetic rotary compressor, which is held so as to be adjustable in the axial direction and the radial direction, the outer surface side of the combined first casing, second casing, and third casing. A plurality of plate-like elastic members having bent portions whose both ends are bent toward the center of the shaft so that they can be externally fitted and locked to the second housing as stoppers for restricting the axial direction, the radial direction and the rotation direction of the second housing. It is also a configuration using individual pieces.

Further, a closed container having an oil sump at the bottom,
A main shaft provided in the closed container and rotated by a motor, a compression mechanism connected to the main shaft for compressing a fluid, a pump for forcibly supplying oil to each bearing supporting the main shaft, and an oil suction pipe body are inserted. The main housing includes a first housing having an insertion hole, a second housing including a first housing, a second housing, and a third housing, and the second housing has the main shaft with respect to the first housing. In an oil supply device for a hermetic rotary compressor, which is held so as to be adjustable in the axial direction and the radial direction, the outer surface side of the combined first casing, second casing, and third casing. So that it can be fitted and locked onto
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 so that a tip portion of the first bent portion contacts the outer surface of the first casing. And a third bent portion integrally bent from the bent portions at both ends along the outer peripheral surfaces of the first, second, and third housings and the bottom surface of the third housing. The plate-shaped elastic member may be a stopper that restricts the axial direction, the radial direction, and the rotation direction of the second housing.

[0013]

In the oil supply device for the hermetic rotary compressor according to the present invention, the stopper is provided in the second housing composed of the first casing, the second casing and the third casing. The axial direction, the radial direction, and the rotation direction of the two housings can be restricted. Also, the second housing can be assembled in advance.

Further, both ends are bent toward the center of the shaft so that they can be fitted and locked on the outer surfaces of the combined first casing, second casing and third casing. By using a plurality of plate-shaped elastic members each having a portion as a stopper that restricts the axial direction, the radial direction, and the rotation direction of the second housing, the first housing, the second housing, and the third housing It is possible to press down the casing of at the same time in the axial and radial directions,
The second housing can be assembled in advance.
Further, since the rotation direction is restricted, it is not necessary to provide a rotation stopping pin in the second housing as in the conventional case.

Both ends are bent toward the center of the shaft so that they can be fitted and locked on the outer surfaces of the combined first casing, second casing and third casing. A first bent portion, a second bent portion that is bent in the axial direction so that a tip portion of the first bent portion contacts the outer surface of the first housing, and the bent portions at both ends A plate-like elastic member having outer peripheral surfaces of the first, second, and third housings and a third bent portion integrally bent along the bottom surface of the third housing is provided. By using the stopper that restricts the axial direction, the radial direction, and the rotation direction of the two housings, it is possible to prevent the stopper from coming off from the second housing, in addition to having the same effect as described above, even when an exciting force is applied. .

[0016]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. The same parts as those of the conventional structure are designated by the same reference numerals. According to FIG. 1 and FIG. 2, 30, 31 are
In the radial direction of the first housing 20a, the second housing 20b, and the third housing 20c that respectively configure the second housing 20, the concave groove is provided at the same position along the axial direction. is there. Reference numerals 32 and 33 are plate-like elastic members that are stoppers inserted into the concave grooves 30 and 31, respectively. The plate-shaped elastic members 32 and 33 are bent at both ends of the concave grooves 30 and 31 and are bent toward the center of the shaft 32a, 32b and 3 respectively.
3a and 33b are provided. This plate-shaped elastic member 3
2, 33 are the bent portions 32a, 32b, 33a,
By 33b, the first casing 20a and the third casing 20c are fixed so as to be pressed in the axial direction.

In the oil supply device for the hermetic rotary compressor constructed as described above, since the plate-shaped elastic members 32 and 33 are inserted and fixed in the concave grooves 30 and 31, respectively,
Case 20a, second case 20b, and third case 2
0c is pressed in the axial and radial directions. Therefore, the second housing 20 can be assembled in advance,
The assembling work of the second housing 20 in the third housing 21 can be eliminated, and the axial force regulation by only the thrust force of the spring 24 is eliminated.
Assembling workability can be improved by reducing the thrust force.

Further, since the rotation direction is restricted, the rotation stopping pins 28 and 29 (see FIG. 5) are attached to the second housing 20.
It becomes unnecessary to provide it inside. Therefore, the pin 2
It is not necessary to secure a space in the radial direction for providing the parts 8 and 29, and the third housing 21 and the like can be made small as well as the second housing 20 can be made small in the radial direction. It becomes compact.

Further, since the concave grooves 30 and 31 are asymmetrical with respect to the axial center, the first casing 20a, the second casing 20b, and the third casing 20c are always in the same direction. Cannot be assembled, for example, the second housing 20
Only b is attached by rotating 180 °, and an error such as the oil suction port 26 and the oil discharge port 27 overlapping each other is prevented. Furthermore, due to the elastic force of the plate-shaped elastic members 32 and 33,
It is possible to absorb an assembly error at the time of assembly.

Example 2. In the first embodiment, the plate-shaped elastic members 32 and 33 are inserted and fixed in the concave grooves 30 and 31, respectively, but as shown in FIGS. The plate-shaped elastic member 34 is
The elastic members 32 and 33 are connected and integrally formed.

That is, the elastic member 34 of this embodiment is
This concave groove 3 is inserted into the concave grooves 30 and 31 and
0 and 31 are connected in the space formed by the first housing 19 and the lower end of the second housing 20b side, and at the end of the concave grooves 30 and 31 on the first housing 20a side. The first bent portions 35, 36 formed on the axial center side, and the second bent portions 35a, 36a in the main axis (not shown) direction along the axial direction of the first housing 20a, and the both ends From the bent portions 35 and 36 to the first, second and third casings 2
0a, 20b, 20c and the third casing 20c integrally bent along the outer peripheral surface and the bottom surface of the third housing 20c.
And the bent portion 37. Then, the second bent portions 35a and 36a are provided in the first housing 20.
It is inserted in the radial clearance between a and the spring 24.

The oil supply device for the hermetic rotary compressor according to the second embodiment configured as described above has the same effects as those of the first embodiment, and the joint 1 is used in the first embodiment.
When the vibration force generated by the rotation of 0 is transmitted to the second housing 20, the plate-shaped elastic members 32 and 33 may move in the radial direction due to the interference with the spring 24 and may be removed from the concave grooves 30 and 31. However, in this embodiment, since the plate-shaped elastic member 34 is configured so as not to move reliably in the radial direction, the plate-shaped elastic member 34 does not move even when a vibration force is applied.
Can be prevented from coming off the concave grooves 30 and 31.

[0023]

As described above, according to the present invention, the second
Since the housing is provided with the stoppers for restricting the axial direction, the radial direction and the rotation direction, it is possible to assemble the second housing in advance, so that the assembling workability is improved and the size can be reduced. Further, by eliminating the rotation stopping pin, no space is provided in the radial direction.

Further, by using a plurality of plate-like elastic members having bent portions whose both ends are bent as stoppers for restricting the axial direction, the radial direction and the rotation direction of the second housing, the first elastic member can be obtained. The housing, the second housing, and the third housing can be simultaneously pressed in the axial direction and the radial direction, and the second housing can be assembled in advance in the same manner as described above. Further, since the rotation direction is restricted, it is not necessary to provide a rotation stop pin in the second housing as in the conventional case. Therefore, no space is provided in the radial direction.

Also, a plate-like elastic member is integrally formed by bending the bent portions at both ends along the outer peripheral surfaces of the first, second and third casings and the bottom surface of the third casing. By using the stopper that restricts the axial direction, the radial direction, and the rotation direction of the second housing, the same effect as described above can be obtained, and the stopper is the second housing even when the vibration force is applied. Can be prevented from coming off.

[Brief description of drawings]

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

2 is a bottom view of an oil supply device for the hermetic rotary compressor in FIG. 1. FIG.

FIG. 3 is a cross-sectional view of an oil supply device for a hermetic rotary compressor according to a second embodiment of the present invention.

FIG. 4 is a bottom view of the oil supply device for the hermetic rotary compressor in FIG. 3.

FIG. 5 is a 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]

 1 Sealed Container (Shell) 2 Oil Reservoir 5 Compression Mechanism 6 Spindle 7 Motor 10 Joint 13 Oil Pump 19 First Housing 20 Second Housing 20a First Housing 20b Second Housing 20c Third Housing 32 Plate-like 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

Claims (3)

[Claims] 1. A closed container having an oil sump at the bottom, and a main shaft provided in the closed container and rotated by a motor,
A compression mechanism that is connected to the main shaft to compress the fluid, a pump that forcibly supplies oil to each bearing that supports the main shaft, a first housing having an insertion hole through which a pipe for oil suction is inserted, and a first housing. And a second housing including a second housing and a third housing, and the like. The second housing is held with respect to the first housing so as to be adjustable in the axial direction and the radial direction of the main shaft. An oil supply device for a hermetic rotary compressor, wherein the second housing is provided with stoppers for restricting an axial direction, a radial direction and a rotation direction. 2. A closed container having an oil sump at the bottom, and a main shaft provided in the closed container and rotated by a motor,
A compression mechanism that is connected to the main shaft to compress the fluid, a pump that forcibly supplies oil to each bearing that supports the main shaft, a first housing having an insertion hole through which a pipe for oil suction is inserted, and a first housing. And a second housing including a second housing and a third housing, and the like. The second housing is held with respect to the first housing so as to be adjustable in the axial direction and the radial direction of the main shaft. In an oil supply device for a hermetic rotary compressor, the first casing, the second casing, and the third casing combined with each other.
A plate-shaped elastic member having bent portions whose both ends are bent toward the center of the shaft so that the second housing can be fitted and locked on the outer surface of the second housing. An oil supply device for a hermetic rotary compressor, characterized in that a plurality of stoppers are used to control the oil. 3. A closed container having an oil sump at the bottom, and a main shaft provided in the closed container and rotated by a motor,
A compression mechanism that is connected to the main shaft to compress the fluid, a pump that forcibly supplies oil to each bearing that supports the main shaft, a first housing having an insertion hole through which a pipe for oil suction is inserted, and a first housing. And a second housing including a second housing and a third housing, and the like. The second housing is held with respect to the first housing so as to be adjustable in the axial direction and the radial direction of the main shaft. In an oil supply device for a hermetic rotary compressor, the first casing, the second casing, and the third casing combined with each other.
A first bent portion whose both ends are bent toward the center of the shaft so that the first bent portion can be externally fitted and locked to the outer surface of the first housing, and a tip portion of the first bent portion is the first housing. A second bent portion that is bent in the axial direction so as to come into contact with the outer surface of the first casing, and the outer peripheral surfaces of the first, second, and third casings from the folded portions at the both ends, and the bottom surface of the third casing. A plate-shaped elastic member having a third bent portion integrally bent along the axis is a stopper for restricting the axial direction, the radial direction and the rotation direction of the second housing. Oil supply device for hermetic rotary compressor.