JPH05149264A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To improve wearing resistance and reliability by forming an Oldham's ring, which is for restricting a turning scroll from rotating on its own axis, out of a circular annular unit and key parts consisting of material different from each material respectively of a frame and the turning scroll and of separate unit from each other. CONSTITUTION:In a scroll compressor, an Oldham's ring 28 is interposed between a frame of fixing a fixed scroll and a turning scroll set up through compression space relating to the fixed scroll. In the Oldham's ring 28, each key part 30, 31 protrusively provided on both surfaces of a circular annular unit 29 is stopped respectively to each key groove of the frame and turning frame, thus to restrict rotation of the turning scroll on its own axis. Here, the circular annular unit 29 and each key part 30, 31, using a material mutually different from each material respectively of the frame and the turning scroll, are formed into a unit separate from each other. Each key part 30, 31 is placed orthogonal to each other on both the surfaces of the circular annular unit 29 and fixed by a method of screw stopping, pin stopping, etc.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A scroll type compressor, for example, has a structure as shown by 1 in FIG. 4 and combines two spirally processed blades (fixed scroll 2 and swivel scroll 3). The gas is compressed by the relative movement of these.

That is, the fixed scroll 2 is fixed to a fixed plate 5 provided in the closed case 4, and a motor is also fixed to the fixed plate 5 via a frame 6. 7 is fixed. The swivel scroll 3 is attached to the upper end of the crankshaft 8 of the motor 7 in a state of being combined with the fixed scroll 2 via a compression chamber 9.

Then, the center of the turning scroll 3 is rotated at a constant radius around the center of the fixed scroll 2 without rotating the turning scroll 3 with respect to the fixed scroll 2. Then, the turning scroll 3 is turned.

As a result, the compression chamber 9 formed by the fixed scroll 2 and the swirl scroll 3 swirls and moves from the outer circumference to the center to compress the gas. The compressed gas is discharged to the outside from a discharge port 2a formed at the center of the fixed scroll 2.

In the scroll type compressor 1, generally, the swirl scroll 3 and the frame 6 are used as an Oldham mechanism as a means for preventing rotation of the swivel scroll 3. Are linked by.

That is, 180 degrees in the circumferential direction of the lower surface of the turning scroll 3 and the upper surface of the frame 6, respectively.
Key grooves 3a and 6a are provided at positions deviated from each other along the radial direction. The lower surface of the turning scroll 3 and the frame
The Oldham ring 10 shown in FIG.

The Oldham ring 10 is formed by integrally projecting two sets of keys 10b and 10c, which are orthogonal to each other, on both surfaces of one annular body 10a (Oldham ring body) having a rectangular cross section. The key 10b provided on the side is inserted into the key groove 3a provided on the lower surface of the swivel scroll 3, and the key 10c provided on the lower surface side is provided on the upper surface of the frame 6. Insert into the key groove 6a.

Thus, the frame 6, the Oldham ring 10, and the swivel scroll 3 constitute an Oldham mechanism, and the center of the swivel scroll 3 extends around the center of the fixed scroll 2. Even when it is rotated, the turning scroll 3 keeps the same phase as the frame 6 and does not rotate.

[0010]

By the way, while the scroll type compressor 1 is operating, the keys 10b and 10c of the Oldham ring 10 and the swing scroll 3 and the frame 6 are held. The grooves 3a, 6a are always in a sliding state. Therefore, the keys 10b and 10c and the key groove 3
The sliding between a and 6a is subject to considerably severe wear resistance.

In the conventional scroll type compressor 1, the orbiting scroll 3 is formed of aluminum alloy for weight reduction, and the frame 6 is formed of cast iron for reasons such as rigidity and low cost. It is often done. On the other hand, the Oldham ring 10 is made of one kind of material.

Generally, the conditions of abrasion resistance between metals are considerably influenced by the metal materials to be combined, but in the above-mentioned conventional example, the Oldham ring 10 is made of one kind of material, and therefore the swivel scroll. Conditions for the best wear resistance against Rule 3 (aluminum alloy) and the above-mentioned frame 6
It was sometimes impossible to simultaneously satisfy the best wear resistance condition for (cast iron).

The present invention has been made in view of the above circumstances, and is the key portion of the Oldham ring and the turning scroll.
It is an object of the present invention to provide a scroll type compressor which has good wear resistance with respect to the key grooves of the reel and the frame and has high reliability.

[0014]

SUMMARY OF THE INVENTION The present invention is provided between a frame having a fixed scroll fixed thereto and a swivel scroll provided to the fixed scroll via a compression space. , A key portion is provided on both surfaces of the torus, and the key portion is provided for each of the frame and the orbiting scroll.
In a scroll type compressor provided with an Oldham ring which is locked in a groove to regulate the rotation of the swiveling scroll,
The key portion of the Oldham ring is formed separately from the torus, and the frame and the turning scroll are respectively formed.
It is characterized in that it is formed of a material different from that of the resin.

[0015]

According to this structure, the key groove of the fixed scroll and the key portion of the Oldham ring, and the frame.
The combination of the groove of the groove and the key of the Oldham ring can provide the best wear resistance.

[0016]

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.

FIG. 1 shows a scroll type compressor 1 of the present invention.
5 is shown. The compressor 15 has basically the same configuration as that of the conventional example, and reference numeral 4 in the drawing is a closed case.

A donut plate-shaped fixing plate 16 shown in FIG. 3 is fixed in the closed case 4. A compression mechanism 18 and a frame 19 are fixed to the fixing plate 16 with bolts 17.

A motor 20 is provided on the lower surface side of the frame 19. The motor 20 includes a stator 20a fixed to the frame 19 and the stator 20a.
Rotor 20b rotatably inserted in the rotor and this rotor 2
0b, one end of which is fitted and supported by the crankshaft 21.

The lead wire 22 of the motor 20 is
It is led out from the through hole 16 a provided in the fixed plate 16 to the upper end portion of the hermetic case 4 and connected to the external terminal portion 23.

The compression mechanism 15 is rotatably attached to the fixed scroll 2'fixed to the fixed plate 16 and the upper end of the crankshaft 19 and fixed to the fixed scroll 2 as in the conventional example. 'With a swirl scroll 3'combined via a compression chamber 9'.

However, the compression mechanism 15 has the same capacity but a smaller diameter than the conventional example. This is to reduce the size of the compression mechanism 15 in order to secure the volume (the portion indicated by A in the figure) in the closed case corresponding to the recent increase in capacity of the compressor.

A discharge chamber 25 is formed on the upper surface of the fixed scroll 2 ', and the discharge chamber 25 has a discharge cover.
It is covered with 26. A discharge pipe (not shown) is connected to the discharge cover 26, and the discharge pipe is liquid-tightly led from the upper surface of the closed case 4 to the outside.

An Oldham ring 28 is provided between the lower surface of the swivel scroll 3'and the upper surface of the frame 19 to prevent the swivel scroll 3'from rotating, as in the conventional example. Is inserted. The Oldham ring 28 is formed as shown in FIG.

That is, the Oldham ring 28 is provided with a ring-shaped body 29 (Oldham ring body) having a rectangular cross section, and keys 30 and 31 (keys) provided separately from the ring-shaped body 29.
Part) is fixed to the upper and lower surfaces of the annular body 29 so as to be orthogonal to each other. As a method of fixing the keys 30 and 31 to the annular body 29, screwing, pinning or the like is adopted.

An aluminum alloy is selected as the material of the annular member 29 for the reason of weight reduction and the like, and the materials of the keys 30 and 31 are, as will be described later, the material of the orbiting scroll 3'and the above. It is defined by the material of the frame 19.

That is, the materials of the above keys 30 and 31 are
Those having good wear resistance with the key grooves 3'a and 19a described later are selected. Factors that influence the wear resistance include the adhesion between metals, the adhesion inhibiting force of oxide films and other materials, the surface roughness and the ease with which the worn surfaces are compatible, the strength and hardness of the material, etc. Generally, materials made of the same material and having substantially the same hardness have poor slidability and wear resistance.

The material of the above key is determined in consideration of these matters as follows. For example, the above-mentioned turning scroll
If the material of the rule 3'is aluminum alloy and the material of the frame 19 is gray cast iron, the key 30 on the swivel scroll 3'side of the Oldham ring 28 is high carbon chrome steel, and the key 30 on the frame 19 side. Key 31 is likely to be stainless steel.

That is, the materials of the sliding key 30 (31) and the key groove 3'a (19a) are required to be at least different materials, and also different hardness.

In the Oldham ring 28, as in the conventional example, the keys 30 and 31 fixed to the upper and lower surfaces are provided with the fixed scroll 3'and the key groove 3'of the frame 19, respectively.
It is attached in a state of being inserted in a and 19a.

The Oldham ring 28 allows the swirling scroll 3'to swivel with respect to the fixed scroll 2'without rotating, whereby the gas in the compression chamber 9 is compressed. While moving from the outer periphery to the central portion, it is sequentially discharged from the discharge port to the outside.

With this structure, the wear resistance between the keys 30 and 31 of the Oldham ring 28 and the key grooves 3'a and 19a of the fixed scroll 3'and the frame 19 is improved. Therefore, the reliability of the scroll compressor 15 is improved. Further, by making the torus 29 and the keys 30 and 31 separate from each other, the torus 29 can be made of an aluminum alloy or the like, so that the weight of the Oldham ring 28 can be reduced. As a result, it is possible to reduce vibration and noise during operation.

On the other hand, by reducing the size of the compression mechanism 18, the volume between the compression mechanism 18 and the closed case 4 (the portion indicated by A) can be increased. Since the gap between 18 and the hermetic case 4 becomes large, it is necessary to make the fixing plate 16 larger than that of the conventional example (shown by 5 in FIG. 4).

However, when the fixing plate is enlarged without changing the wall thickness for weight reduction, the above-mentioned motor is used as in the conventional example.
If the portion of the cable 20 from which the lead wire 22 is taken out is cut out as shown by 5a shown in FIG. 4, the fixing plate 16 may be broken from this portion.

On the other hand, in the above-described embodiment, the portion through which the lead wire 22 of the fixing plate 16 is taken out is not the notch but the through hole 16a, so that the rigidity is improved and the risk of breakage is reduced. .. 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, the materials of the above keys 30 and 31 are not limited to the above one embodiment, and may be changed within the range where the best wear resistance condition can be obtained.

Further, the materials for the orbiting scroll 3'and the frame 19 are not limited to those in the above-mentioned embodiment, and when these materials are changed, the key 30 is accompanied by this. , 31 also need to be changed.

[0037]

As described above, the scroll of the present invention is
The compressor of the ring type is provided between a frame to which a fixed scroll is fixed and a revolving scroll provided to the fixed scroll through a compression space, and both surfaces of the annular body. And an Oldham ring for restricting rotation of the swivel scroll by locking the key portion in the respective key grooves of the frame and the swivel scroll. In a scroll compressor, the key of the Oldham ring is used.
The parts are formed separately from the torus and are made of materials different from those of the frame and the orbiting scroll, respectively.

According to this structure, the wear resistance between the key portion of the Oldham ring and the key grooves of the fixed scroll and frame is improved, so that the reliability of the scroll compressor is improved. The property is improved.

Further, by making the key a separate body, the torus can be made of aluminum alloy or the like, so that the weight of the Oldham ring can be reduced. By this,
It is possible to reduce driving vibration and noise.

[Brief description of drawings]

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

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

FIG. 3 is a plan view showing a fixing plate.

FIG. 4 is a vertical cross-sectional view showing a conventional example.

FIG. 5 is a perspective view showing an Oldham ring.

[Explanation of symbols]

2 '... fixed scroll, 3' ... turning scroll, 3'a
... key groove, 15 ... scroll type compressor, 19 ... frame
Um, 19a ... key groove, 28 ... Oldham ring, 30 ... key (key part), 31 ... key (key part).

Claims (1)

[Claims] 1. A fixed scroll is provided between a frame fixed to the fixed scroll and a swivel scroll provided to the fixed scroll through a compression space, and is provided on both surfaces of the annular body. A scroll provided with an Oldham ring that projects a key portion and locks the key portion in the respective key grooves of the frame and the swivel scroll to regulate the rotation of the swivel scroll. -In a compressor, the key portion of the Oldham ring is formed separately from the torus and is formed of a material different from the material of the frame and the orbiting scroll. And scroll type compressor.