JPH0681780A - Scroll type compressor - Google Patents

Abstract

(57) [Summary] [Objective] An object of the present invention is to obtain a scroll compressor having an Oldham ring that is easy to manufacture, less likely to be damaged, lightweight, and excellent in wear resistance. [Structure] The Oldham ring 28 of the scroll compressor 10 includes an annular ring body 29 and a ring body 29.
The inner circumferential surface of the ring body 29 is provided at predetermined intervals in the circumferential direction, and the concave groove 34 that opens to the side surface of the ring body 29 and the lower end portion 3 are formed.
0a is inserted into the recessed groove so that the ring body 2
Upside down L-shaped block-shaped key combined with the side of 9
The portion 30 and the inner peripheral surface of the ring body 29 and one side surface of the lower end portion 30a of the key portion 30 combined with the ring body 29 are continuously formed along the circumferential direction of the ring body 29. And an annular groove 35, which is mounted in the annular groove 35 and fixes the ring body 29 and the key portion 30 to each other.
And the retaining ring 33.

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 combines two spirally processed blades (a fixed scroll and a swirl scroll) and compresses gas by relative movement between them.

That is, the fixed scroll is fixed to a frame provided in the closed case, and the upper end of the crankshaft of the motor provided in the closed case is also provided with the above-mentioned fixed scroll. Install the swivel scroll.

By operating the motor, the center of the turning scroll is rotated at a constant radius around the center of the fixed scroll without causing the turning scroll to rotate. The swivel scroll revolves with respect to the fixed scroll.

As a result, the crescent-shaped working chamber formed by the fixed scroll and the orbiting scroll moves from the outer circumference to the center while rotating to compress the gas. The compressed gas is discharged to the outside from the discharge port formed in the center of the fixed scroll.

Further, in the above scroll type compressor, as a means for preventing the rotation of the orbiting scroll from rotating, the orbiting scroll and the frame are generally connected by an Oldham mechanism.

That is, on the lower surface of the orbiting scroll and the upper surface of the frame, there are provided key grooves which are displaced by 180 degrees in the circumferential direction and extend in the radial direction of the rotary shaft. Then, the Oldham ring 1 shown in FIG. 7 is inserted between the lower surface of the turning scroll and the upper surface of the frame.

In the Oldham ring 1, a pair of first and second key portions 3 and 4 are provided on the upper surface and the lower surface of an annular ring body 2, respectively. A pair of first key portions 3 provided on the upper surface and a pair of second key portions provided on the lower surface.
The parts 4 are orthogonal to each other.

As a method of molding such an Oldham ring, a method of integrally molding the ring main body and the first and second key portions, and a method of molding the first There is a method in which the (second) key portion 3 (4) and the ring body 2 are formed as separate bodies, and these are fixed by a connecting pin 5 to be molded.

In the Oldham ring 1 thus formed, the first key portion 3 provided on the upper surface side is inserted into the key groove provided on the lower surface of the orbiting scroll (not shown), and the Old key ring 1 is provided on the lower surface side. The second key portion 4 provided is also inserted into a key groove provided on the upper surface of a frame (not shown).

As a result, the frame, the Oldham ring 1, and the turning scroll constitute an Oldham mechanism, and even if the center of the turning scroll rotates around the center of the fixed scroll, The orbiting scroll keeps the same phase as the frame (fixed to the closed case) and does not rotate.

[0012]

[Problems to be Solved by the Invention] By the way, the first and second
In the case of the Oldham ring 1 in which the key portions 3 and 4 and the ring body 2 are integrally formed, the first and second key portions 3 and 4 and the ring are formed by cutting an annular metal material. It is necessary to mold the surface of the main body 2. Such cutting and forming requires a lot of man-hours, is very troublesome, and takes time. Also,
A lot of chips and poor material yield.

Further, there is a great demand for the Oldham ring 1 to be reduced in weight and reduced in vibration. Therefore, the Oldham ring 1 is entirely formed of a lightweight aluminum alloy, and then the first and second key portions 3 and 4 are subjected to a predetermined surface treatment in order to improve wear resistance. Must be,
In addition, the number of man-hours may increase.

On the other hand, in the Oldham ring 1 (FIG. 8) in which the first and second key portions 3 and 4 and the ring body 2 are formed separately and then these are joined by the connecting pin 5, the first and second Second
A hard material with excellent wear resistance is used for the key parts 3 and 4,
The ring body 2 must be made of lightweight aluminum alloy or the like.

However, in such an Oldham ring 1, when a force in the rotational direction is applied to the first and second key portions 3 and 4, the connecting pin 5 causes the connecting pin 5 to move to the first and second key portions. Along with the parts 3 and 4, they try to rotate in the first coupling hole 2a of the ring body 2. If the Oldham ring 1 is continuously used in such a state, the ring body 2 is made of a relatively soft aluminum alloy, so that the connection with the connecting pin is loosened, and the first and second key portions 3 and 4 are connected to each other. The connecting pin 5 may come off the ring body 2 and damage the scroll compressor.

Further, when fixing the above-mentioned key portion with a connecting pin, severe processing accuracy is required, the number of parts is increased, and assembling such as press fitting of the pin is troublesome. is there.

The present invention has been made in view of the above circumstances, and it is possible to effectively prevent the key portion from coming off from the Oldham ring, and at the same time, the scroll type compressor having a good manufacturability of the Oldham ring. It is intended to provide.

[0018]

SUMMARY OF THE INVENTION According to the present invention, a fixed scroll, a swivel scroll provided in the fixed scroll through a compression space, and rotation of the swirl scroll are restricted. In the scroll compressor including the Oldham ring, the Oldham ring is provided on the inner peripheral surface of the ring body at predetermined intervals in the circumferential direction, and at least one end of the ring body is formed. One of the concave groove opened to the side surface, the key portion combined with the side surface of the ring main body by inserting into the concave groove, and the inner peripheral surface of the ring main body and the key portion combined with the ring main body. The side surface includes an annular groove formed continuously along the circumferential direction of the ring body, and an annular retaining ring that is mounted in the annular groove and fixes the ring body and the key portion. thing It is an feature.

[0019]

According to this structure, the key portion is assembled to the ring body and then fixed to the ring body by the retaining ring.

[0020]

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 10 of the present invention shown in FIG. 1 has basically the same structure as the conventional example, and 11 in the drawing is a hermetic case.

A fixing plate 12 is provided in the closed case 11, and a compression mechanism 14 and a frame 15 are fixed to the fixing plate 12 by bolts 13. Also,
A motor 16 is provided on the lower surface side of the frame 15. The motor 16 includes a stator 17 fixed to the frame 15, a rotor 18 rotatably inserted in the stator 17, and a lower end of the rotor 18 fitted and supported by the rotor 18. The crankshaft 19 has a portion projecting from the upper surface of the frame 15.

On the other hand, the compression mechanism 14 has a fixed scroll 21 fixed to the fixed plate 12 as in the conventional example.
And the compression space 23 is loosely fitted to the upper end of the crankshaft 19 so as to be eccentrically rotatable and is fixed to the fixed scroll 21.
And a swirl scroll 22 combined with each other.

A discharge chamber 25 is formed on the upper surface of the fixed scroll 21 and communicates with the compression space 23 via a discharge port 21a provided at the center of the fixed scroll 21. 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 closed case 11.

Between the lower surface of the swivel scroll 22 and the upper surface of the frame 15 facing each other, an Oldham ring is formed in order to prevent the swivel scroll 22 from rotating, as in the conventional example. 28 is inserted. This Oldham ring 2
8 is formed as shown in FIG.

The Oldham ring 28 has an annular ring main body 29 having a rectangular cross section. The upper and lower side surfaces of the ring main body 29 are provided with a first and a second, respectively, which are provided in directions orthogonal to each other. The key portions 30 and 31 are provided.
The first and second key portions 30 and 31 are formed separately from the ring body 29 and are assembled on both side surfaces of the ring body 29. Then, on the inner peripheral surface of the Oldham ring 28, an annular C-shaped retaining ring 33 for fixing the ring body 29 and the first and second key portions 30 and 31.
Is elastically fitted.

Referring to FIG. 3, this Oldham ring 28
The configuration will be described in more detail. However, the configuration of the second key portion 31 is the same as that of the first key portion 30, and the description thereof is omitted.

As shown in the enlarged view of FIG.
On the inner peripheral surface of the portion of 9 where the first key portion 30 is attached, a recessed groove 34 that opens to both side surfaces of the ring body 29 is provided. On the other hand, the first key portion 30
Is formed in a substantially inverted L-shaped block body, and the lower end portion 3
By inserting 0a into the concave groove 34, it can be combined with the upper side surface of the ring body 29.

On the other hand, the inner peripheral surface of the ring body 29 and the first (second) key portion 30 (31) which is continuous with the inner peripheral surface of the ring body 29 by being combined with the ring main body 29. An annular groove 35 into which the C-shaped retaining ring 33 is inserted is formed on one surface of the lower end portion 30a along the circumferential direction of the ring body 29.

Therefore, when the first and second key portions 30 and 31 are assembled on both side surfaces of the ring body 29, the C-shaped retaining ring 33 is elastically fitted into the annular groove 35. It As shown in FIG. 4, this C-shaped retaining ring 33 has a C shape surrounded by two eccentric circles, and has insertion holes 36, 36 at both ends for inserting tools such as pliers.

The C-shaped retaining ring 33 is mounted in the annular groove while being radially compressed using a plier, so that the ring main body 29 and the first and second key portions 3 are formed.
0 and 31 are fixed.

The first and second key portions 30 and 31 are also provided.
In order to slide in the key grooves 22a and 15a, as will be described later, a radial force of the Oldham ring 28 acts. Therefore, the C-shaped retaining ring 33 is required to have a restoring force sufficient to support this force. For example, when a C-shaped retaining ring having an outer diameter D (1 + Δ) and a maximum width b is mounted in an annular groove having an inner diameter D, the maximum stress σ of the C-shaped retaining ring 33 is given by the following equation. σ = b · E · Δ / D Generally, in order to support the first and second key portions 30 and 31, σ = 100 Kg / cm ² Therefore, the Oldham ring 28 is provided with the above C-shaped retaining rings 33 in a number capable of withstanding this force. For example, in the embodiment, two C-shaped retaining rings 33 are used.

The ring body 29, the first and
The second key portions 30 and 31 are made of different materials. That is, as the material of the ring body 29, an aluminum alloy is selected in order to reduce the weight. The first and second key portions 30 and 31 are made of materials having excellent wear resistance and slidability with respect to the orbiting scroll 22 and the frame 15, respectively. The material of the portion 30 is, for example, S50C (carbon steel for machine structure), and the material of the second key portion 31 is SUJ2 (high carbon chrome bearing steel) harder than that of the first key portion 30. It

The Oldham ring 28 formed in this way
As shown in FIG. 1, the two sets of the key portions 30 and 31 are attached in a state of being inserted into the respective key grooves 22a and 15a of the orbiting scroll 22 and the frame 15, respectively.

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. It rotates, is sent from the outer peripheral portion of the fixed scroll 21 to the central portion, and is sequentially discharged from the discharge port 21a and the discharge pipe 27 to the outside.

According to such a configuration, the above first and second
Even if a rotational force is applied to the key portions 30 and 31, the lower end portion of the key portion is engaged with the concave groove of the ring main body,
It does not rotate. Further, as compared with the case where a pin is used to connect the ring main body and the key portion which are formed as separate pieces, conditions such as processing accuracy are alleviated, so that the manufacturing becomes easy. Therefore, it is possible to obtain the scroll compressor 10 having the Oldham ring 1 that is less likely to be damaged, is lightweight, has excellent wear resistance, and has less noise. It should be noted that the present invention is not limited to the above-mentioned one embodiment, and can be variously modified without changing the gist of the invention.

For example, as shown in FIG. 5, as shown in FIG. 6, a part of the first and second key portions 30 ', 31' is projected outward in the radial direction of the ring body 29. In addition, the shape of the first (second) key portions 30 'and 31' may be concave block bodies.

In the above embodiment, the first and second key portions 30 and 3 are provided on both side surfaces of the Oldham ring 28, respectively.
However, the present invention is not limited to this. For example, the first key portion 30 and the turning scroll 22 corresponding to the fixed scroll 21 are provided only on one side surface of the ring body 29. The second key 31 corresponding to the above may be provided so as to be orthogonal to each other.

[0038]

As described above, according to the present invention, the fixed scroll, the orbiting scroll provided for the fixed scroll through the compression space, and the rotation of the orbiting scroll. With an Oldham ring that regulates
In the Le compressor, the Oldham ring is provided with an annular ring body, a concave groove which is provided on an inner peripheral surface of the ring body at predetermined intervals in the circumferential direction, and at least one end of which is opened to a side surface of the ring body. A key portion to be combined with the side surface of the ring main body by being inserted into the concave groove,
An annular groove formed continuously on the inner peripheral surface of the ring body and one side surface of a key portion combined with the ring body along the circumferential direction of the ring body, and mounted in the annular groove. An annular retaining ring for fixing the ring body and the key portion is provided. With such a configuration, it is possible to obtain a scroll compressor having an Oldham ring that is easy to manufacture, is less likely to be damaged, is lightweight, and has excellent wear resistance.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an Oldham ring.

FIG. 3 is an enlarged perspective view showing a part of the Oldham ring.

FIG. 4 is a plan view showing a C-shaped retaining ring.

FIG. 5 is a perspective view showing an Oldham ring according to another embodiment.

FIG. 6 is an enlarged perspective view of a key portion.

FIG. 7 is a perspective view showing a conventional Oldham ring.

FIG. 8 is a perspective view showing a part of the Oldham ring in an enlarged manner.

[Explanation of symbols]

10 ... scroll type compressor, 11 ... hermetically sealed case, 15 ...
Frame, 15a ... key groove, 21 ... fixed scroll, 2
2 ... Swirl scroll, 22a ... Key groove, 28 ... Oldham ring, 29 ... Ring body, 30 ... First key part, 30
a ... lower end portion, 31 ... second key portion, 33 ... C-shaped retaining ring,
34 ... concave groove, 35 ... annular groove.

Claims (1)

[Claims] 1. A scroll comprising a fixed scroll, a swivel scroll provided in the fixed scroll through a compression space, and an Oldham ring for restricting rotation of the swivel scroll. -In the Le-type compressor, the Oldham ring is provided with an annular ring body and a predetermined interval in the circumferential direction on the inner peripheral surface of the ring body,
A recessed groove having at least one end open to the side surface of the ring body, a key portion that is fitted into the side surface of the ring body by inserting into the recessed groove, an inner peripheral surface of the ring body and the ring body. An annular groove continuously formed along the circumferential direction of the ring main body on one side surface of the key portion, and an annular groove mounted in the annular groove to fix the ring main body and the key portion. And a retaining ring for the scroll type compressor.