JPH05223065A - Scroll compressor and manufacture thereof - Google Patents

Abstract

PURPOSE:To maintain satisfactorily relative positional accuracy in both swinging and fixed scrolls by mounting an Oldham's coupling engaging the swinging scroll to the fixed scroll with a projection of the coupling fitting in a fixed groove of the fixed scroll. CONSTITUTION:In a fixed scroll 1 compressing fluid in cooperation with a swinging scroll 2 supported revolvably by the Oldham's coupling 3, a plate-like scroll tooth 1a is formed in the lower section while being provided on the outer peripheral surface encircling the scroll tooth 1a integrally with a faucet part 1b provided on the bottom with a fixed groove 1c. A claw part 3b of a projection provided on the Oldham's coupling 3 is fitted in the fixed groove 1c of the fixed scroll 1 to mount the Oldham's coupling 3 while after the faucet part 1b is fitted in a faucet part 4a of a frame 4 the fixed scroll 1 is fixed to the frame by fastening a bolt 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used in an air conditioner, a refrigeration system, etc., and a method for manufacturing the scroll compressor.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view of a scroll compressor disclosed in Japanese Patent Laid-Open No. 2-140481. In the figure, the fixed scroll 1 has plate-like spiral teeth 1a formed in the lower portion, and a reamed hole 1d is formed on the outer peripheral side thereof. The fixed scroll 1 is fitted into a frame 4 and fastened by bolts 7. The orbiting scroll 2 is a plate-like spiral tooth 1 of the fixed scroll 1.
A plate-shaped spiral tooth 2a having the same shape as that of a is formed in the upper part, a hollow boss 2b having a bearing 2c for an orbiting scroll on the inner surface of the cylinder is provided in the lower part, and a reamed hole 2g is provided in the outer peripheral part. is there. Also, the swing scroll 2 is the reamed hole 2
The position of the fixed scroll 1 is determined by the reamer pin 8 by g and the reamer hole 1d, and is supported swingably by the thrust bearing surface 4b of the frame 4 via the thrust bearing surface 2d. The Oldham coupling 3 has a claw C3 formed in the lower portion.
c is fitted in a fixed groove 4d formed in the frame 4, and the orbiting scroll 2 is formed by a claw 3a formed in the upper part.
It is engaged with a guide groove 2e provided on the shaft so that the orbiting scroll can reciprocate. The frame 4 is formed with a spigot portion 4a into which the fixed scroll 1 is fitted on the outer peripheral side of the upper portion, a thrust bearing surface 4b which slidably supports the orbiting scroll on the inside and outside, and is fixed on the inside and inside. A groove 4d is provided. An eccentric shaft 5a is formed at the upper end of the main shaft 5, and the eccentric shaft 5a is a bearing 2c of the orbiting scroll 2.
And is connected to the orbiting scroll 2. The main shaft 5 is rotatably supported by a bearing 4c of the frame 4 and fixed to a drive motor 6.

Since the conventional scroll compressor is constructed as described above, when the drive motor 6 is driven, the spindle 5 is driven.
Rotates, and the eccentric shaft 5a revolves. When the eccentric shaft 5a revolves, the orbiting scroll 2 fitted to the eccentric shaft 5a via the bearing 2c is reciprocally fixed to the fixed groove 4c of the frame 4 via the claw C3c. Since the rotation of the swing scroll 2 is restricted by the guide groove 2e of the swing scroll 2 by the claw A3a of the Oldham coupling, the swing scroll 2 swings while slidingly contacting the thrust bearing surface 4b of the frame 4 via the thrust bearing surface 2d. Exercise. By this swinging motion, the reamer pin 8 accurately combines the reamer hole 2g of the oscillating scroll with the reamer hole 1b of the fixed scroll. Both of the spiral tooth 1a and the spiral tooth 1a smoothly contact each other, and the refrigerant is sequentially compressed in a plurality of crescent-shaped compression chambers formed by the both.

[0004]

In the conventional scroll compressor constructed as described above, the fixed scroll 1 is independently fitted to the frame 4 and fixed by the bolts 7.
The orbiting scroll 2 is connected to a frame 4 via an Oldham coupling 3.
Since they are fixed to the frame 4, they are independently fixed to the frame 4. Therefore, the relative position between the fixed scroll and the orbiting scroll is an indirect positioning with low accuracy. Further, since the claw A3a and the claw C3c of the Oldham coupling are not on the same machining surface, continuous machining cannot be performed and re-chucking is performed, which results in poor machining of relative positional accuracy. Therefore, in order to ensure the optimum relative positional accuracy between the fixed scroll 1 and the orbiting scroll 2 that determines the compression operation performance of the scroll compressor, the fixed scroll 1 has a reamed hole 1
d. The reamer hole 2g is machined in the orbiting scroll 2, and the reamer pin 8 must be inserted after aligning the reamer hole 1d and the reamer hole 2g, and then removing it. There was a problem that it did not happen. Further, since the reamed hole 2g is formed in the thrust bearing surface 2d of the orbiting scroll 2, there is a problem that the thrust bearing area is reduced and bearing wear occurs. Furthermore, the liquid must be compressed during the compression operation. When such a large compression load is applied, the fixed scroll 1 is fastened to the frame 4 only by the bolts 7, so the fixed scroll 1 cannot be fixed only by the strength of the bolts and rotates, and it shifts from the optimum relative position with the orbiting scroll. There was a problem.

The present invention has been made in order to solve the above problems, and a scroll compressor having a good relative positional accuracy between the fixed scroll and the orbiting scroll can be easily assembled and the relative scroll between the fixed scroll and the orbiting scroll. The purpose is to always maintain the optimum position accuracy.

[0006]

In a scroll compressor according to the present invention, an Oldham joint for engaging an orbiting scroll is fixed, and the Oldham joint is fixed by fitting a projection of the Oldham joint and a fixing groove of a fixed scroll. It is attached to a scroll, and this fixed scroll is fitted and fixed to the frame of the compressor.

[0007]

The scroll compressor configured as described above is
Since the Oldham joint that engages the orbiting scroll is attached to the fixed scroll by fitting the protrusion of the Oldham joint and the fixed groove of the fixed scroll, the relative position accuracy of the fixed scroll and the orbiting scroll is easy and always It is maintained optimally and works to repeat smooth and stable compression operation.

[0008]

【Example】

Example 1. FIG. 1 is a sectional view of a scroll compressor showing an embodiment of the present invention. 1 is a fixed scroll, 2 is an orbiting scroll, 3 is an Oldham coupling, 4 is a frame, 5 is a main shaft, 6 is a drive motor, 7 is a bolt. Reference numeral 1 denotes a spigot portion 1 in which a plate-like spiral tooth 1a is formed in a lower portion, and an outer peripheral surface surrounding the periphery of the la is precisely machined to have a coaxiality with the la.
b is formed, and the fixed groove 1c is provided on the bottom surface. Also, 1
Is a protrusion of the Oldham joint 3 and the protrusion 1c, and in this embodiment, is fitted with the claw B3b, whereby the Oldham joint 3 is formed.
And install the spigot 4 of the frame 4 through the 1b.
After being fitted to the spigot part 4c, the bolt 4 is fastened to the frame 4. In order to improve the relative positional accuracy between the plate spiral tooth 1a and the fixed groove 1c, the coaxial accuracy between the plate spiral tooth 1a and the spigot portion 1b, and the machining accuracy of each, 1a, 1c, and 1b are , The same dedicated machine installed in the room where the air-conditioning conditions are constant all year round, and processed successively. 2 has a plate-like spiral tooth 2a having the same shape as the plate-like spiral tooth 1a of the fixed scroll 1 at the upper portion thereof, and has a hollow boss 2b at the lower portion thereof, and a bearing 2c of the orbiting scroll is provided on the cylindrical inner surface of this 2b. In addition, a thrust bearing surface 2d is formed on the center side on the rear surface of the base plate of 2, and an Oldham connecting surface 2f having an Oldham guide groove 2e is formed on the outer peripheral side. 2 is Oldham guide groove 2
e and the projection of the Oldham coupling 3, which is connected to the Oldham coupling 3 by engagement with the claw A3a in this embodiment, and the thrust bearing surface 4 of the frame via the thrust bearing surface 2d.
It is slidably supported by b in the axial direction. In order to improve the positional accuracy of the plate-shaped spiral teeth 2a, the Oldham guide groove 2e, and the bearing 2c, and the processing accuracy of each, 2
a, 2e, and 2c are the same dedicated machines installed in the room where the air-conditioning conditions are constant throughout the year, and are successively processed. 3, the claw A3a is formed upward, and the Oldham guide groove 2e of the oscillating scroll is engaged with the claw A3a, and the oscillating scroll 2 is attached so as to be able to reciprocate. In addition, 3 forms a claw B3b protruding to the outer peripheral side of the same surface,
By fitting the claw B3b into the fixed groove 1c of the fixed scroll, the Oldham coupling is fixed to the fixed scroll so as to be able to reciprocate. The claw A3a and the claw B3b are machined with the same accuracy, and their relative positions are successively machined with high accuracy. A spigot portion 4a for fitting the fixed scroll 1 is formed on the outer peripheral side in the upper part, a thrust bearing surface 4b for slidably supporting the orbiting scroll 2 is formed on the central side, and a lower part is formed at the lower part. Bearing 4c that rotatably supports the main shaft 5
Is formed. In addition, the coaxiality of the 4a and the 4b is accurately processed. Reference numeral 5 designates an eccentric shaft 5a at the upper end thereof, and a bearing 2c of an orbiting scroll is fitted to the 5a to be connected to the orbiting scroll. It is fixed. As described above, the reaming holes for fixed scrolls and orbiting scrolls have been abolished, the work of inserting and removing reamer pins has been eliminated, and a scroll compressor with good relative position accuracy can be easily assembled. Even with an abnormal load that occurs when a liquid compression load is applied to the device, the relative position accuracy of the fixed scroll and the orbiting scroll does not deviate and is always optimally maintained.

FIG. 3 is a manufacturing and assembling process chart showing the machining and assembling procedures of the present invention, 11 and 12 are machining processes for each component, and 13 to 15 are assembling processes. Reference numeral 11 denotes a machining process of the Oldham coupling 3. Since the claw A3a and the claw B3b of the Oldham coupling are on the same machining plane and are continuously machined by only one chucking, their relative positions are accurate. Good processing with few processing errors is performed. Reference numeral 12 denotes a machining process of the fixed scroll 1. The fixed scroll 1 is a dedicated machine installed in a room in which the air conditioning conditions are constant year-round, and the plate-shaped spiral teeth 1a are processed with high precision. Next, 1a
Fixing groove 1c on the same machining surface as 1a with the center of
Is processed continuously without being re-chucked, so that it is processed with high relative position accuracy and high accuracy. 1
In 3, the Oldham joint claw A3a machined with good positional accuracy in 11 is engaged with the Oldham guide groove 2e of the orbiting scroll to attach the orbiting scroll 2 to the Oldham joint 3. At 14, the claw B3b of the Oldham coupling machined at 11 above is fitted into the fixed groove 1c of the fixed scroll machined at 12 above to attach the Oldham joint to the stationary scroll. In FIG. 15, the inlay part 1 of the fixed scroll is replaced with the inlay part 4a of the frame
Then, the fixed scroll is fixed to the frame, and the partial assembly process is completed.

When the drive motor 6 is driven in the scroll compressor constructed as described above, the main shaft 5 rotates,
The eccentric shaft 5a revolves around the sun. By the revolving motion of the eccentric shaft 5a, the eccentric shaft 5a is fitted through the bearing 2c, and the fixed groove 1c of the fixed scroll 1 and the claw B3 of the Oldham coupling are fitted.
The Oldham coupling 3 reciprocally mounted on the fixed scroll by fitting with b, and the claw A of this Oldham coupling.
The orbiting scroll 2 whose rotation is restricted by the 3a and the Oldham guide groove 2e is connected to the frame 4 through the thrust bearing surface 2d.
Oscillating while slidingly contacting the thrust bearing surface 4b. Due to this oscillating movement, both the plate-like spiral tooth 1a of the fixed scroll 1 and the plate-like spiral tooth 2a of the oscillating scroll 2 directly attached to the fixed scroll with high position accuracy via the Oldham coupling 3 are separated. , The smooth contact is made, and the compression of the refrigerant is performed smoothly and stably in the crescent-shaped plurality of compression chambers formed by both teeth.

[0011]

As described above, according to the present invention, the Oldham coupling having the orbiting scroll engaged with it is attached to the fixed scroll by fitting the protrusion of the Oldham coupling and the fixed groove of the fixed scroll. A scroll compressor with good relative position accuracy between the dynamic scroll and the fixed scroll can be easily assembled, and the relative position accuracy between the orbiting scroll and the fixed scroll is always maintained at the optimum level without fail, and smooth and stable compression operation is repeated. A highly reliable scroll compressor can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a partial assembly view showing the first embodiment of the present invention.

FIG. 3 is a partial manufacturing assembly view showing Embodiment 1 of the present invention.

FIG. 4 is a cross-sectional view showing a conventional scroll compressor.

FIG. 5 is a partial assembly view showing a conventional scroll compressor.

[Explanation of symbols]

 1 Fixed scroll 1a Plate-shaped spiral tooth 1b Inlay part 1c Fixed groove 2 Oscillating scroll 2a Plate-shaped spiral tooth 2b Hollow boss 2c Bearing 2d Thrust bearing surface 2e Oldham guide groove 2f Oldham connecting surface 3 Oldham coupling 3a Claw A 3b Claw B 4 Frame 4a Inlay part 4b Thrust bearing surface 4c Bearing 5 Main shaft 5a Eccentric shaft 6 Drive motor 7 Bolt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Ishigaki 6-5-66 Tehira, Wakayama City Mitsubishi Electric Corporation Wakayama Factory

Claims (2)

[Claims] 1. An Oldham coupling with which an orbiting scroll is engaged, a protrusion provided on this Oldham coupling, and a fixing groove that fits with this protrusion, and the fixing groove enables the Oldham coupling to be attached. A scroll compressor, comprising: an Oldham's joint and a fixed scroll provided so as to face each other across the orbiting scroll. 2. A plurality of protrusions provided on the Oldham's joint are continuously machined by one chucking, and the plate-like spiral teeth of the fixed scroll and the fixed groove of the fixed scroll are continuously machined by one chucking. A method of manufacturing a scroll compressor, characterized in that a certain protrusion of the Oldham coupling and a fixed groove of the fixed scroll are fitted and assembled.