JPH05256273A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To effectively receive a thrust load of a turning scroll by arranging a key part in only one surface of an Oldham's ring to make it in small size and also to arrange a thrust plate between the Oldham's ring and the turning scroll. CONSTITUTION:A compressor main unit 12 has a fixed scroll 21 fixed to a frame 15, turning scroll 22 opposed to this fixed scroll and an Oldham's ring 31 for restricting rotation of the turning scroll 22 on its own axis. Here between the frame 15 and the turning scroll 22, a ring-shaped thrust plate 29 is arranged. An Oldham's ring storage groove 30 is formed in a frame contact surface of the thrust plate 29. Further in the inside of the storage groove 30, a through hole 30b is formed. A turning scroll engaging key part 31b is inserted through the through hole 30b and arranged between the turning scroll 22 and the Oldham's ring 31. On the other hand, a thrust plate engaging key part 31a is arranged between the storage groove 30 and the Oldham's ring 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor.

[0002]

2. Description of the Related Art A scroll type compressor is a combination of a fixed scroll machined in a spiral shape and fixed to a frame and a swivel scroll provided so as to freely rotate, and a gas is generated by a relative swirling motion of these. Is to compress.

In order to prevent the turning scroll from rotating, an Oldham ring is usually combined between the lower surface of the turning scroll and the frame. In general, this Oldham ring has a pair of keys protrudingly provided on the upper surface and the lower surface thereof so as to be orthogonal to each other.

However, in order to form the respective keys on the upper and lower surfaces of the Oldham ring, it is necessary to turn the Oldham ring upside down during processing, and it may not be possible to obtain sufficient accuracy. Conventionally, as a means for solving such a problem, Japanese Patent Publication No. 3-501
There is a configuration disclosed in Japanese Patent Laid-Open Publication No. 18-18.

In the scroll type compressor disclosed in this publication, a fixed scroll 2 is fixed to an upper portion of a frame 1 as shown in FIG. The fixed scroll 2 is combined with a swivel scroll 5 attached to the upper end of a crankshaft 4 of a motor 3 attached to the lower portion of the frame 1 via a compression space 6. Has been done. An Oldham ring 7 that restricts the rotation of the turning scroll 5 is provided between the lower surface of the turning scroll 5 and the upper surface of the frame 1.

As shown in FIG. 6, the upper surface of the Oldham ring 7 is provided with two sets of first and second key grooves 8a and 9a orthogonal to each other. A first key 8b slidably engaged with the first key groove 8a is projectingly provided on the lower surface of the flange portion 5a of the swivel scroll 5. On the lower surface, a second key 9b that engages with the second key groove 9a is provided in a protruding manner.

Further, a second key 9b provided on the fixed scroll 2 is inserted through the flange portion 5a of the turning scroll 5 at a position offset by 90 degrees from the first key 8b. A possible cutout 5b is provided.

The orbiting scroll 5 and the fixed scroll 2 are combined with an Oldham ring 7 as shown by a solid arrow in the figure, and as shown in FIG.
Attached to.

Further, as shown in the figure, the lower surface of the orbiting scroll 5 is slidably held by a thrust plate 11 attached to the frame 1. The thrust plate 11 has a function of receiving a thrust load applied to the swirl scroll 5 by compressing the gas in the compression space 6 and keeping the swirl motion of the swirl scroll 5 smooth. ..

In this scroll type compressor, the swivel scroll 5 is operated by operating the motor 3.
The center of the orbiting scroll 5 is rotated around the center of the fixed scroll 2 with a constant radius without causing the rotation of the above-mentioned rotation, so that the fixed scroll 5 and the orbiting scroll 2 revolve.

As a result, the crescent-shaped compression space 6 formed by the fixed scroll 2 and the orbiting scroll 5 moves from the outer periphery to the center while rotating to compress the gas. The compressed gas is discharged to the outside from the discharge port 2a formed at the center of the fixed scroll.

[0012]

By the way, according to the conventional example, the second key 9 provided on the fixed scroll 2 is used.
b is the first key 8 provided on the turning scroll 5.
It is provided radially outside of b. For this reason, the outer diameter of the Oldham ring 7 must be made larger than the outer diameter of the swivel scroll 5, and this scroll compressor may become large.

Further, according to the above construction, the thrust plate 11 for receiving the thrust load of the orbiting scroll is provided inside the Oldham ring 7. Therefore, the thrust load holding area of the thrust plate 11 is small, and the surface pressure is high.
There have been cases where it is not possible to guarantee a smooth turning motion of the turning scroll 5.

The present invention has been made in view of such circumstances, and provides a scroll type compressor which is small in size and can effectively hold the thrust load of the swivel scroll. The purpose is.

[0015]

The present invention comprises a frame to which a fixed scroll is fixed, and a swivel scroll provided to the fixed scroll through a compression space. A scroll type compressor provided with an Oldham ring for restricting rotation of the swivel scroll, the scroll compressor being provided between the frame and the swivel scroll and being fixed to the frame. A ring-shaped thrust plate that receives a thrust load from the swivel scroll and a contact surface side of the thrust plate with the frame are provided along the circumferential direction of the thrust plate. A storage groove for storing the Oldham ring, and a through hole provided in the storage groove along the radial direction of the thrust plate,
A swivel scroll engaging key portion that penetrates through the through hole and is slidably provided in the radial direction between the swivel scroll and one surface of the Oldham ring, the storage groove, and the Oldham ring. And a thrust plate engaging key portion slidably provided in the radial direction orthogonal to the radial direction in which the through hole is provided.

[0016]

According to this structure, the key portion can be provided only on one surface side of the Oldham ring, the Oldham ring can be downsized, and the key portion can be provided between the Oldham ring and the swivel scroll. The thrust plate thus formed can effectively receive the thrust load of the orbiting scroll.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The same components as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. The scroll type compressor 12 of the present invention shown in FIG. 1 has basically the same structure as the conventional example, and 13 in the figure is a closed case.

A frame 15 is fixed in the closed case 13. A motor 16 is provided below the frame 15. This motor 16 is
A stator 17 fixed to the frame 15, a rotor 18 rotatably inserted in the stator 17, and a lower end portion of the rotor 18 which is fitted and supported by the upper end portion 19a.
And a crankshaft 19 projecting from the upper surface of the.

On the other hand, on the upper surface side of the frame 15, a fixed scroll 21 fixed to the frame 15 and an upper end portion 19a of the crankshaft 19 are eccentrically freely rotatably fitted and described above. Fixed scroll 21 and compression space 23
And a swirl scroll 22 combined through.

On the upper surface of the fixed scroll 21, the discharge chamber 2 communicating with the compression space 23 through a discharge port 21a provided at the center of the fixed scroll 21.
5 is formed, and the discharge chamber 25 is covered with a discharge cover 26. A discharge pipe 27 is connected to the discharge chamber 25, and the discharge pipe 27 is liquid-tightly led to the outside from the upper surface of the sealed case 13.

A thrust plate 29 having an outer diameter substantially the same as that of the recess 15a is fitted into the recess 15a defined by the lower surface of the swivel scroll 22 and the upper surface of the frame 15. It is worn. This thrust plate 2
9 is formed in a ring shape and has necessary rigidity, and
It is formed of a member having a very small friction coefficient with the lower surface of the turning scroll 22.

Further, the upper surface of the thrust plate 29 is formed flat and the lower surface side is formed to be concave in the radial direction (width direction).
A storage groove 30 is formed along the circumferential direction of the door 29.

As shown in FIG. 1 (FIG. 1 is a longitudinal sectional view taken along the line X-Y shown in FIG. 2) and FIG. 2, a set of first key grooves 30a is formed at the bottom of the storage groove 30. , 30a are on a straight line (Y
Direction). Further, at a position (a position along the X direction) which is separated from the key groove 30a by 90 degrees in the circumferential direction,
A pair of through holes 30b, 30b are provided.

The storage groove 3 of the thrust plate 29.
The Oldham ring 31 is housed in the 0. As shown in FIGS. 2 and 3, on the upper surface of the Oldham ring 31, a first key 31a as a key portion for engaging a thrust plate in the Y direction is provided so as to project, and a swivel scroll in the X direction. A second key 31b as a key portion for engaging the rule is provided in a protruding manner.

Further, as shown in FIG. 3, the second key is used.
31b is formed higher than the first key 31a. Therefore, the storage groove 30 for the thrust plate 29 is formed.
The Oldham ring 31 is housed in the first key.
31a is a first key groove 30 provided in the storage groove 30.
When engaged with a, the second key 31b penetrates the through hole 30b and projects upward from the upper surface of the thrust plate 29.

The inner diameter Daφ (see FIG. 2) of the Oldham ring housing groove 30 is D, the center diameter of the Oldham ring 31 is W, the width of the Oldham ring 31 is W, and the orbiting scroll 2 is used.
When the eccentricity amount of 2 is e, Da <D−W / 2−e The outer diameter Dbφ of the Oldham ring housing groove 30 is Db> D + W / 2 + e.

As shown in FIG. 1, the thrust plate 29 is fitted in the recess 15a provided on the upper surface of the frame 15 in a state where the Oldham ring 31 is housed in the housing groove 30. Be worn. And this thrust play
As shown in FIG. 3, a swivel scroll 22 combined with the fixed scroll 21 is provided on the upper surface of the door 29, and a second key groove 22a provided on the lower surface is provided above the through hole 30b. The second key of the Oldham ring 31 protruding above
It is attached by engaging with 31b.

The Oldham ring 28 allows the swirl scroll 22 to swivel with respect to the fixed scroll 21 without rotating, whereby the gas in the compression spaces 23 is compressed. The fixed scroll 21 is rotated, sent from the outer peripheral portion to the central portion, and is sequentially discharged from the discharge pipe 27 through the discharge chamber 25 to the outside.

The thrust load applied to the swirl scroll 22 by the compression of the gas at this time is received by the upper surface of the thrust plate 29.

According to this structure, the first and second keys 31a and 31b of the Oldham ring 31 which are orthogonal to each other are provided.
Since the Oldham ring 31 is projectingly provided only on one surface side of the Oldham ring 31, the Oldham ring 31 can be easily processed, and the Oldham ring 31 can be manufactured with high accuracy.

Further, according to this structure, the first and second keys 31a, 31a,
Unlike the conventional example, one key groove is engaged with the thrust plate 29 in the structure in which the protrusion 31b is provided.
Can be smaller than the outer diameter of. As a result, a more compact scroll compressor 12 can be obtained.

Secondly, since the second key 31b is adapted to be engaged with the orbiting scroll 22 through the through hole 31a provided in the thrust plate 29, the thrust plate is provided. The sliding area between 29 and the turning scroll 22 can be increased. As a result, the surface pressure can be reduced, so that the swivel scroll 22 described above can be used.
It is possible to make the swiveling motion of the robot smoother. In addition, this allows the first and second keys 31a and 31b.
Since the load applied to the key is also small, the reliability of the sliding portion of the key is also improved.

Furthermore, the above-mentioned first and second keys 31a, 3
Since the load applied to 1b is reduced, the range of material selection of the first and second keys 31a and 31b is widened, and the degree of freedom in design is increased.

On the other hand, the oil supply to the first and second keys 31a and 31b of the Oldham ring is performed by the Oldham ring 3 described above.
Since 1 is located below the thrust plate 22, it is easier than the conventional example. It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified without changing the gist of the invention.

For example, in the above embodiment, the first key groove 30a is provided at the bottom of the storage groove 30, but it may be provided at the side wall as shown in FIG. 4 (30a).
´). In this case, the Oldham ring to be used is the Oldham ring 31 ′ having the first key 31′a protruding outward in the radial direction. Even with such a configuration, it is possible to obtain the same effect as that of the above-described embodiment.

Further, in the above-mentioned one embodiment, the thrust plate 29 is provided with the concave portion 15a provided in the frame 15.
However, it may be fixed to the fixed scroll 21.

Furthermore, the above-mentioned first and second keys 31a, 3
1b (the swivel scroll engaging key portion and the thrust plate engaging key portion) are projected on the Oldham ring 31 side, but the lower surface of the swivel scroll 22 and the storage groove of the thrust plate 29 are provided. It may be provided so as to project on the side of 30. In this case, the Oldham ring 31 is provided with a key groove corresponding to the key.

[0038]

As described above, the scroll of the present invention is
The rotary compressor includes a frame to which a fixed scroll is fixed, and a swirl scroll provided to the fixed scroll via a compression space, and the swirl scroll is also included.
A scroll equipped with an Oldham ring that regulates the rotation of the rotor.
And a swirl scroll for the frame.
And a ring-shaped thrust plate fixed to the frame and receiving the thrust load from the orbiting scroll, and the flare of the thrust plate.
On the contact surface side of the thrust plate, which is provided along the circumferential direction of the thrust plate, for accommodating the Oldham ring, and in the accommodating groove along the radial direction of the thrust plate. A through hole provided, and a swivel scroll engaging key portion penetrating through the through hole, slidably provided in the radial direction between the swivel scroll and one surface of the Oldham ring, A thrust plate engaging key portion slidably provided in a radial direction orthogonal to a radial direction in which the through hole is provided is provided between the housing groove and one surface of the Oldham ring. is there.

According to such a structure, there is an effect that it is possible to obtain a scroll type compressor which is small in size and can effectively hold the thrust load of the swivel scroll.

[Brief description of drawings]

FIG. 1 is an XY shown in FIG. 2, showing an embodiment of the present invention.
FIG.

FIG. 2 is a plan view of a thrust plate combined with an Oldham ring.

FIG. 3 is a perspective view showing the assembly of the Oldham ring.

FIG. 4 is a side view showing another embodiment.

FIG. 5 is a vertical sectional view showing a conventional example.

FIG. 6 is a perspective view showing the assembly of the Oldham ring.

[Explanation of symbols]

12 ... scroll type compressor, 13 ... hermetically sealed case, 15 ...
Frame, 21 ... Fixed scroll, 22 ... Rotating scroll
29, thrust plate, 30 ... storage groove, 30b ...
Through hole, 31 ... Oldham ring, 31a ... First key
(Key portion for engaging thrust plate), 31b ... Second key (key portion for engaging revolving scroll).

Claims (1)

[Claims] 1. A swivel scroll provided with a frame to which a fixed scroll is fixed and a swivel scroll provided to the fixed scroll through a compression space.
A scroll equipped with an Oldham ring that regulates the rotation of the rotor.
A compressor of the type, which is provided between the frame and the orbiting scroll,
A ring-shaped thrust plate which is fixed to the frame and receives a thrust load from the orbiting scroll, and the thrust plate on the contact surface side of the thrust plate with the frame. A storage groove provided along the circumferential direction of the thrust plate for storing the Oldham ring, a through hole provided in the storage groove along the radial direction of the thrust plate, and a through hole penetrating the through hole. Between the swivel scroll and the one surface of the Oldham ring, which is slidably provided in the radial direction between the swivel scroll engaging key portion, the storage groove and the one surface of the Oldham ring. And a thrust plate engaging key portion slidably provided in a radial direction orthogonal to the radial direction in which the through hole is provided, the scroll type compressor.