JPH0454294A - Scroll compressor - Google Patents

Abstract

PURPOSE:To absorb a frame deformation due to shrinkage fitting and prevent an assembly defect such as the position shifts a fixed scroll and a frame, by providing an escape hole at a shrinkage fitting portion axial height range so that the frame and a shell may be detached from a shrinkage fitting contact axial height range. CONSTITUTION:When a sealed terminal 81 is electrified, a motor 7 is driven and a main shaft 3 is rotated. As a result, a swing scroll 2 is put into a swing movement, and in combination with a fixed scroll 1, compresses liquid gas. A frame 5 is fixed at a shell 8 by means of shrinkage fitting. In this instance, at the frame 5, a fixed scroll reamer hole 101a and an escape hole 5a communi cating with a frame reamer hole 5b are provided at a shrinkage fitting contact portion 10 axial height range. As a result, deformation due to shrinkage fitting is absorbed. Also, when the above reamer holes 101a, 5b are used for positioning the fixed scroll 1 and the frame 5 at the time of assembly, the position shifts of the fixed scroll 1, and the swing scroll 2 are prevented, and a smooth com pression action is obtained.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to scroll pressure WaS.

[Conventional technology]

FIG. 3 shows a sectional view of a conventional scroll compressor disclosed, for example, in Japanese Patent Application Laid-Open No. 60-206999. swirl wrap 2a
3 is a main shaft for swinging the swinging scroll 2, 4 is an Oldham joint that prevents the swinging scroll 20 from rotating, 5 is a frame supporting the fixed scroll 1, 6 is a subframe, It passes through the frame 5 and is connected to the fixed scroll 1 with bolts 102. 7 is a motor that drives the main shaft 3; 8 is a shell as a sealed container; 1 is a refrigerant gas discharge boat provided at the center of the fixed scroll 1; 31 is an oil pump at the lower end of the main shaft 3;
It is immersed in an oil sump 86 at the bottom of the shelf. 51 is a thrust bearing that receives the thrust force of the swinging scroll 2;
52 is a main bearing that supports the main shaft 3, and 61 is an auxiliary bearing that supports the intermediate portion of the main shaft 3.

The frame 5 and the sub-frame 6 have a main bearing 52 and a sub-bearing 6.
In order to achieve coaxiality of the bearings 1, the bearings and the Japanese cylinder fitting portions with high coaxial accuracy are press-fitted to each other and are connected to each other. A rotor portion 73 of the motor 7 is fixed to the main shaft 3, and a stator portion 71 is fixed to the subframe 6 with bolts 72. The outer periphery of the subframe 6 is fixed to the shell 8 by shrink fitting. Reference numeral 82 denotes a suction pipe that opens into a motor side space 84 within the shell. Reference numeral 85 denotes an in-shell fixed scroll side space partitioned by the subframe 6, and the pressure is equalized on the suction space side by a uniform hole groove provided on the outer periphery. Reference numeral 83 denotes a discharge pipe, which opens through the shell 8 to the discharge boat 11 having a fixed scroll pressure. 81
is a sealed terminal provided at the upper end of the shell 8, and is connected to the motor 7 by a lead wire.

Next, the operation will be explained. When the sealed terminal 81 is energized, the motor 7 is driven and the main shaft 3 is rotated.

This causes the oscillating scroll 2 to oscillate, and the fluid gas is compressed by the cooperative action with the fixed scroll 1.

At this time, the fluid gas is sucked from the outside of the shell 8 by the suction pipe 82, flows into the shell inner space 84.85, and then
It is sucked into the compression chambers of both scrolls 12, compressed, and discharged from the discharge boat 11 to the outside of the shell 8 through the discharge pipe 83. Further, as the main shaft 3 rotates, oil in the oil reservoir 86 is drawn by the centrifugal pump action of the oil pump 3, and this oil passes through the oil supply passage in the main shaft 3 to the thrust bearing 51. After lubricating the main bearing 52, sub-bearing 61, etc., the oil falls to the oil reservoir 86 again due to gravity and is stored there.

[Problem to be solved by the invention]

Conventional scroll compressors are constructed as described above, so in a cantilever bearing system in which the main shaft 3 is supported only at the top, the main shaft 3 is bent due to centrifugal force during high-speed rotation, and the rotor and stator of the motor 7 are bent. If the main shaft 3
It is desirable to use a double-sided bearing system in which the main shaft 3 is supported at its upper and lower parts. Therefore, the frame 5 supports the upper part of the main shaft 3, and the sub-frame 6 is fixed on the opposite side of the frame with the motor stator 71 as a boundary, and the lower end of the main shaft 3 is supported by the sub-frame 6. need to be supported.

In addition, in order to create a low-pressure type compressor that is effective for cooling the motor, in the case of double-sided bearings, the sub-frame 6 is located below the motor 7, so the frame 5 must be able to separate the high-pressure chamber and the low-pressure chamber. It is desirable to seal the shell 5 with the frame 5, and shrink fitting of the frame 5 and the shell 8 is generally used as a method for this purpose.

However, when the frame 5 is shrink-fitted, the frame may be deformed, and as a result, the fixed scroll 1 and the frame 5
There was a problem in that the reamer hole for positioning was deformed and the reamer pin could not be inserted. In addition, the thrust bearing 51 of the frame 5 may be deformed, reducing the bearing's fin performance, causing relative misalignment with the swinging scroll 2, or deforming the spiral wrap, resulting in a reduction in performance due to refrigerant gas leakage. There was a problem that caused

This invention was made in order to solve the above-mentioned problems.The frame is shrink-fitted into the shell and sealed, and even if the frame is deformed due to shrink-fitting, the distortion is absorbed and there is no problem in assembling or refrigerant. An object of the present invention is to obtain a scroll compressor that prevents performance deterioration due to gas leakage.

[Means for Solving the Problems] A scroll compressor according to claim 1 of the present invention is a fixed scroll compressor in which a compression chamber is formed between both spiral wraps by combining spiral wraps whose winding directions are opposite to each other on a plywood board. A scroll and an oscillating scroll, a frame that fixes the fixed scroll and has a bearing in the center, a main shaft that is rotatably supported by the frame and swings the oscillating scroll, and a motor that drives the main shaft. The above-mentioned frame and motor are supported by the shell, and a sealed terminal is arranged between the frame and the shell. In a scroll compressor in which the fixed scroll and the frame are provided with a reamed hole and a reamed pin, and the outer peripheral surface of the frame and the inner surface of the shell are closely fixed by shrink fitting, the frame and the shell are in contact with each other through shrink fitting. The frame is characterized in that a relief hole is provided in the frame below the axial height range outside the axial height range, and is larger than the reamed hole at least in the axial height range above the axial height range where the shrink fitting contact occurs.

Further, the scroll compressor according to claim 2 of the present invention includes a fixed scroll and an oscillating scroll that form a compression chamber between both spiral wraps 1 by combining spiral wraps with opposite winding directions on plywood. a frame that fixes the fixed scroll and has a bearing in the center; a main shaft that is rotatably supported by the frame and swings the swinging scroll; and a motor that drives the main shaft; The motor is supported on the shell, and a sealed terminal is disposed on the shell between the frame and the shell, and the shell separates the low pressure chamber and the high pressure chamber, and the positioning of the fixed scroll and the oscillating scroll is controlled between the fixed scroll and the frame. The outer circumferential surface of the frame and the inner surface of the shell are closely fixed by shrink-fitting using a reamed hole and a reaming pin provided in the scroll compressor. It is characterized by a coaxial circumferential slit provided on the end face of the frame.

[For production]

In the scroll compressor according to claim 1 of the present invention, when the shell and the frame are fixed by shrink fitting and the fixed scroll and the frame are positioned using a reaming bin, the frame and the shell are in contact with each other by shrink fitting within the axial height range of the reamed hole. Since the relief hole is provided in the frame in the shrink-fitting axial height range so as to be outside the axial height range, even if the frame is deformed due to shrink-fitting, the deformation can be absorbed by the relief hole.

Furthermore, the scroll compressor according to claim 2 of the present invention provides a circumferential slit in the shrink-fitting portion, so that
Even if the thrust bearing portion of the frame attempts to deform due to shrink-fitting stress, the slit can absorb the deformation.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a sectional view of a scroll compressor according to an embodiment of the present invention, in which l is a fixed scroll having a spiral wrap 1a, 2 is a scroll 111 having a spiral wrap 2a combined with the spiral wrap la, Reference numeral 3 denotes a main shaft that makes the swinging scroll 2 swing, 4 an Oldham joint that prevents the swinging scroll 20 from rotating, and 5 a frame that is fixed to the shell 8 by shrink fitting. A relief hole 5a is provided in the axial height range of the contact portion 10, which communicates with the reamed hole 101a of the fixed scroll and the reamed hole 5b of the frame. A subframe 6 is provided on the opposite side of the frame from the motor 7 and supports the lower end of the main shaft 3. 7 is a motor that drives the main shaft 3; 11 is a refrigerant gas discharge boat provided at the center of the fixed scroll 1;
32 is an oil pump, 51 is a thrust bearing that receives the thrust force of the swinging scroll 2, 81 is a sealed terminal provided in the shell 8, and 82 is an eye tube, which opens into the motor side space 84 in the shell 8. Reference numeral 83 denotes a discharge pipe that opens into the fixed scroll side space 85 within the shell 8 . 86 is an oil reservoir at the bottom of the shell 8.

FIG. 2 shows another embodiment of the scroll compressor according to the present invention, and the same parts as those in FIG. 5c is a slit provided on the circumference of the frame 5 in the axial height range of the shrink-fit contact portion IO.

1 and 2 above, the reamer hole 101a provided in the fixed scroll 1 and the corresponding reamer hole 5b on the frame side are aligned with each other by inserting a reamer bin (not shown) and fixed. The center of scroll 1 and the center of frame 5 are made to coincide.

On the other hand, the center of the frame 5 coincides with the rotation center of the main shaft 3, and if the rotation center of the main shaft 3 and the center of the fixed scroll 1 are made to coincide with each other, the center of the frame 5 can be eccentric by the crank radius via the main shaft 3. The center of the assembled oscillating scroll 2 is eccentrically positioned relative to the center of the fixed scroll 1 by the above-mentioned radius.

Next, the operation will be explained. When the sealed terminal 81 is energized, the motor 7 is driven to rotate and the main shaft 3 is rotated. As a result, the oscillating scroll 2 starts an oscillating movement and is combined with the fixed scroll 1, and the fluid gas starts to be compressed according to the compression principle of the scroll compressor. At this time, the fluid gas is sucked from outside the shell 8 through the suction path 82, flows into the shell space 84, and is then sucked into the compression section combined by the fixed scroll 1 and the swinging scroll 2, and is compressed according to the compression principle described above. After passing through the discharge boat 11, the discharge pipe 83
It is discharged to the outside of the shell 8 through. When the main shaft 3 rotates, oil in the oil reservoir 86 is sucked by the centrifugal pump action of the oil pump 32, passes through the oil supply passage provided in the main shaft 3, lubricates the thrust bearing 51, etc., and then is re-lubricated by gravity. The oil returns to the oil reservoir 86 at the bottom of the shell 8.

In the scroll compressor shown in FIG. 1, the frame 5 is fixed to the shell 8 by shrink fitting, and the scroll reamer hole 101 is fixed to the frame 5 in the axial height range of the shrink-fit contact portion lO.
By providing a relief hole 5a that communicates with frame reamer hole 5b, deformation due to shrink fitting can be absorbed. There is no positional shift due to deformation, and the compression operation can be performed smoothly without any positional shift between the fixed scroll 1 and the swinging scroll 2.

In addition, in the scroll compressor shown in Fig. 2, the frame 5
is fixed to the shell 8 by shrink fitting, but by providing a slit 5C in the axial height range of the shrink fitting contact portion 10 in the frame 5, deformation due to shrink fitting can be absorbed, thereby improving the shaft rotation performance. The reliability of the compressor can be improved without causing a decrease in the refrigerant gas, causing relative misalignment with the oscillating scroll 2, or deterioration of performance due to leakage of refrigerant gas due to deformation of the spiral wrap. .

〔Effect of the invention〕

As explained above, according to the present invention, by providing a relief hole in the axial height range of the shrink-fitting part so as to be outside the axial height range where the frame and shell come into contact with each other through shrink-fitting, Can absorb deformation. This prevents the reamer hole from being deformed and making it difficult to insert the reamer pin, and also prevents assembly defects such as misalignment between the fixed scroll and the frame.

In addition, by providing a slit on the frame end face that is coaxial with the outer peripheral surface of the frame in the axial height range where the shell and frame come into contact with each other through shrink fitting, it is possible to absorb the deformation of the frame due to shrink fitting, thereby preventing deformation of the thrust bearing. As a result, the reliability of the bearing is improved, and relative misalignment with the orbiting scroll does not occur, and the performance of the compressor does not deteriorate.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a scroll compressor according to one embodiment of the present invention, Fig. 2 is a sectional view of a scroll compressor according to another embodiment, and Fig. 3 is a sectional view of a conventional scroll compressor. . ■... Fixed scroll, la... Spiral lamp, 10
1a... Reamer hole, 2... Oscillating scroll, 2a...
...Spiral wrap, 3...Main shaft, 5...Frame, 5
a... Relief hole, 5b... Reamer hole, 5c... Slit, 7... Motor, 8... Shell, 10... Shrink fitting contact portion, 81... Sealed terminal. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masu Oiwa 2nd figure C: Suritsure 1st figure 3

Claims (2)

[Claims] (1) A fixed scroll and an oscillating scroll that form a compression chamber between both spiral wraps by combining spiral wraps with opposite winding directions on a base plate, and a bearing at the center of the fixed scroll. a main shaft that is rotatably supported by the frame and swings the swinging scroll; and a motor that drives the main shaft; A sealed terminal is arranged between the frame and the shell, and the shell separates the low-pressure chamber and the high-pressure chamber. In a scroll compressor in which the frame and the shell inner surface are closely fixed by shrink fitting, the reamed hole of the frame is provided below outside the axial height range where the frame and the shell come into contact with each other through shrink fitting, and at least the shaft above which is in contact with the shrink fit is provided. A scroll compressor characterized in that the frame is provided with a relief hole that is larger than the reamer hole in the directional height range. (2) A fixed scroll and an oscillating scroll that form a compression chamber between the two spiral wraps by combining spiral wraps with opposite winding directions on a base plate, and a fixed scroll that is fixed and has a bearing in the center. a main shaft that is rotatably supported by the frame and swings the swinging scroll; and a motor that drives the main shaft; A sealed terminal is arranged between the frame and the shell, and the shell separates the low-pressure chamber and the high-pressure chamber. In a scroll compressor in which the shell and the inner surface of the shell are tightly fixed by shrink fitting, a circumferential slit coaxial with the outer circumferential surface of the frame is provided on the end surface of the frame in the axial height range where the shell and the frame are in contact with each other by shrink fitting. Characteristic scroll compressor.