KR101952374B1 - apparatus for preventing rotation of orbiting scroll of scroll compressor - Google Patents

Abstract

An embodiment of the present invention relates to an apparatus for preventing rotation of a scroll compressor in which a sleeve ring is connected to a connection portion to constitute a rotation preventing ring so that the number of parts is reduced and assembly is facilitated, An anti-spinning device for a scroll compressor in which the entire end of an anti-rotation ring is in close contact with a back plate to function as a tip chamber.

Description

[0001] The present invention relates to an apparatus for preventing rotation of a scroll compressor,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for preventing rotation of an orbiting scroll of a scroll compressor, and more particularly to an apparatus for preventing rotation of a orbiting scroll of a scroll compressor.

The compressor used in the cooling system of an automobile sucks the evaporated working fluid from the evaporator and transfers it to the condenser in a state of high temperature and high pressure which is easy to be liquefied.

The compressor includes a reciprocating type in which compression is performed while a portion compressing the working fluid reciprocates, and a rotary type in which compression is performed while rotating.

In the reciprocating type, there is a crank type in which a driving force of a drive source is transmitted to a plurality of pistons using a crank, a swash plate type in which a swash plate is transmitted, and a wobble plate type in which a wobble plate is used.

Rotary types include rotary rotary vanes using rotating rotary axes and vanes, and scrolling with fixed and rotary scroll.

Fig. 1 shows a scroll compressor disclosed in Korean Patent Laid-Open Publication No. 10-2013-0011658 (Jan. 30, 2013) as an example of the prior art. 1, the scroll compressor 1 mainly includes a driving unit 3, a control unit 5, and a compression unit 7.

The driving unit 3 is a driving source for generating the rotational power of the compressor 1 and includes a driving unit housing 31 and an intermediate housing 32 constituting an outer body, a driving unit housing 31, and a stator 33, and a rotor 34 which rotates inside the stator 33.

The driving unit housing 31 is generally cylindrical in shape and forms an outer body of the driving unit 3. An intermediate housing 32 may be provided between the driving unit housing 31 and the control unit 5, A bearing housing 35 protrudes from the bottom surface of the bearing housing 35 and a bearing 36 for rotatably supporting the rotary shaft 37 of the driving unit 3 rotor 34 is installed in the bearing housing 35.

The intermediate housing (32) is formed with a suction port (38) for sucking refrigerant through one side of the circumferential surface.

The stator 33 includes a stator core 33a mounted as an electromagnet on the inner circumferential surface of the drive housing 31 and a stator core 33b mounted on the stator core 33a as a kind of electromagnet, And a coil 33b which is wound around the coil 33a.

The rotor 34 is rotatably driven inside the stator 33 and is rotatably inserted into a through hole at the center of the stator core 33a of the stator 33. The rotor 34 is rotatably supported by a rotating shaft 37, ) Of the permanent magnet.

Therefore, when the stator 33 is energized, the rotor 34 is driven to rotate by the interaction with the stator 33 according to the driving principle of the motor, and the rotating shaft 37 rotates together with the rotor 34 .

The control unit 5 controls the operation of the driving unit 3 and is electrically connected to the stator 33 of the driving unit 3 to energize the stator 33 to rotate or stop the rotor 34 The control unit 5 includes a head housing 51 coupled to one side of the intermediate housing 32 and a printed circuit board 52 and a PCB 52 mounted inside the head housing 51. [ And various electronic components such as a plurality of elements mounted on the substrate.

The compression section 7 is a section for compressing the refrigerant by rotating by the rotational driving force generated in the driving section 3 and is connected to the rear end of the rotary shaft 37 of the driving section 3.

The compression section 7 includes an orbiting scroll 71 rotatably mounted on the inner rear end of the drive housing 31 and a fixed scroll 72 paired with the orbiting scroll 71 for compressing the refrigerant, The refrigerant flowing into the compression chamber 73 formed between the scroll 71 and the fixed scroll 72 is compressed by the relative rotation of the scroll 71 and the fixed scroll 72.

More specifically, the orbiting scroll (71) is formed with an orbiting scroll lap (71a) formed in the shape of an involute curve so as to converge toward the center, and a driving portion (3) is provided at the center portion of the orbiting scroll lap And the rear end of the rotary shaft 37 of the rotary shaft 34 is engaged via the eccentric bush 39 to rotate in synchronization with the rotor 34. [

The fixed scroll 72 is fixed to the inner rear end of the drive housing 31 and is centered in the form of an involute curve on the opposite surface of the orbiting scroll 71 so as to be aligned with the orbiting scroll wrap 71a of the orbiting scroll 71 The fixed scroll wrap 72a converging toward the fixed scroll wrap 72a is protruded.

Therefore, when the orbiting scroll 71 revolves (revolves) with respect to the fixed scroll 72, the volume of the compression space formed between the orbiting scroll wrap 71a and the fixed scroll wrap 72a changes according to the volume of the orbiting scroll and the fixed scroll The refrigerant sucked into the outer periphery of the laps 71a and 72a is compressed and moved to the central portion and the refrigerant compressed at the high pressure is discharged to the high pressure chamber of the cover housing 74 through the discharge port 72b formed at the center of the fixed scroll 72 (75).

The cover housing 74 is coupled to the rear end of the drive housing 31 such that one opening of the cover housing 74 faces the rear of the fixed scroll 72. The cover housing 74 is provided at one side thereof with a discharge port 76 are formed through.

That is, the refrigerant compressed in the compression chamber 73 is discharged to the high-pressure chamber 75 through the discharge port 72b, and the high-pressure refrigerant discharged into the high-pressure chamber 75 is partitioned into a guide wall in the cover housing 74 Flows along the flow path, and is eventually discharged to the outside through the discharge port 76.

When the orbiting scroll 71 is rotated, the fixed scroll wrap 72a and the orbiting scroll lobes 71a are rotated by the rotation of the rotating shaft 37, The rotation of the orbiting scroll 71 is prevented by the rotation of the compressor.

2, which is an enlarged view of part A of Fig. 1, includes a sleeve ring 80 mounted on one side surface of the orbiting scroll 71, and a fixing pin (not shown) mounted on one side of the driving part housing 31, (81), and the end of the fixing pin (81) is inserted into the inner space of the sleeve ring (80).

Therefore, the orbiting motion of the orbiting scroll (71) is performed in a range in which the sleeve ring (80) is movable with respect to the fixing pin (81), and the rotation of the sleeve ring (80) is hindered by the fixing pin (81).

3, a plurality of sleeve rings 80 are mounted on the orbiting scroll 71, and the same number of the fixing pins 81 are mounted on the drive housing 31. As shown in FIG. The sleeve ring 80 is press-fitted into the sleeve ring groove 71b formed on the side surface of the orbiting scroll 71 and the fixing pin 81 is press-fitted or screwed into the fixing pin hole 31a formed on the side surface of the driving unit housing 31 .

On the other hand, a tip seal groove 71c is formed on the outer peripheral portion of the mounting surface of the sleeve ring 80 of the orbiting scroll 71 and a tip seal 82 is inserted into the tip seal groove 71c. The tip chamber 82 is in close contact with the surface of the back plate 83 mounted on the side surface of the drive housing 31 so as to seal the space between both sides with respect to the inner side thereof to thereby mutually block the relatively low pressure portion and the high pressure portion on the refrigerant flow path, So that the suction, low pressure, and discharge of the refrigerant can be smoothly performed.

Since the sleeve ring 80 does not contact the back plate 83, a step d exists between the sleeve ring 80 and the tip chamber 82 as shown in FIG.

A plurality of parts such as a sleeve ring 80, a fixing pin 81 and a tip chamber for preventing rotation of the orbiting scroll 71 are mounted between the orbiting scroll 71 and the side surface of the drive housing 31 in contact therewith The assembling is troublesome and time consuming.

Since the sleeve ring 80 and the fixing pin 81 are both made of a metal material, noises are generated due to collision and friction between metals during operation of the orbiting scroll 71. The sleeve ring 80 and the fixing pin 81 The number of generated noises increases.

Korean Patent Publication No. 10-2013-0011658 (published on January 30, 2013)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems as described above, and it is an object of the present invention to provide a scroll compressor in which the number of parts for preventing rotation of the orbiting scroll and air- And an object of the present invention is to provide a revolving scroll anti-rotation device for a scroll compressor in which the assembling time is reduced and the noise caused by the orbiting scroll operation can be reduced.

According to a preferred embodiment of the present invention, there is provided an orbiting scroll comprising: a plurality of sleeve rings mounted on an orbiting scroll; a connection portion connecting the sleeve rings to form one rotation prevention ring; And a fixing pin inserted into the sleeve ring to prevent rotation of the scroll compressor.

The anti-rotation ring is installed so as to surround the periphery of the portion where the orbiting scroll and the rotary shaft of the scroll compressor are connected.

The sleeve ring and the connecting portion of the anti-rotation ring are equally spaced on the same circumference, and a connection portion connects the sleeve rings.

The width of the sleeve ring of the anti-rotation ring and the connection portion is the same.

The sleeve ring and the connecting portion of the anti-rotation ring are in close contact with the back plate mounted on the driving unit housing to block the gap between the orbiting scroll and the driving unit housing.

The orbiting scroll is formed with a sleeve ring groove and a connecting groove groove into which the sleeve ring and the connecting portion of the anti-rotation ring are inserted.

The anti-rotation ring is made of PTFE (Polytetrafluoroethylene).

According to the scroll compressor anti-rotation device of the scroll compressor according to the embodiment of the present invention, since the plurality of sleeve rings are constituted by one part through the connection part, the number of parts is reduced, so that the assembly is easy and the assembling time is reduced.

Since the sleeve ring and the connection portion closely contact the back plate to function as a tip chamber, there is no need to use a conventional tip chamber. Accordingly, the number of parts is reduced, so that the assembly is easy and the assembly time is reduced.

Since the sleeve ring and the connecting portion are made of Teflon material, collision and friction between the metal of the sleeve ring and the fixing pin are avoided, thereby reducing noise caused by orbiting scroll operation.

1 is a cross-sectional view of a scroll compressor according to the prior art;
FIG. 2 is an enlarged view of part A of FIG. 1, showing a state in which the sleeve ring, the fixing pin, and the tip room are installed.
3 is a perspective view of the orbiting scroll with a plurality of sleeve rings mounted thereon;
4 is a perspective view of an orbiting scroll having a rotation preventing ring and a rotation preventing ring mounting groove formed therein according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of the anti-rotation ring and the fixing pin according to an embodiment of the present invention as a corresponding view of FIG. 2;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a revolving scroll anti-rotation device of a scroll compressor according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, and these may vary depending on the intention of the user, the operator, or the precedent. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following embodiments are not intended to limit the scope of the present invention, but merely as exemplifications of the constituent elements set forth in the claims of the present invention, and are included in technical ideas throughout the specification of the present invention, Embodiments that include components replaceable as equivalents in the elements may be included within the scope of the present invention.

Example

The overall structure of the scroll compressor according to an embodiment of the present invention is the same as that of the conventional art, and will be briefly described with reference to FIG.

The outer body of the scroll compressor comprises a drive housing 31, an intermediate housing 32, a head housing 51 and a cover housing 74, a suction port 38 formed in the intermediate housing 32, And the discharge port 76 is formed in the discharge port 74.

The refrigerant evaporated in the evaporator flows into the compressor through the suction port 38 and flows through the intermediate housing 32, the drive housing 31 and the cover housing 74 and is discharged to the discharge port 76 and supplied to the condenser do.

A stator 33 and a rotor 34 are provided in the driving housing 31 to constitute a driving unit 3 and the orbiting scroll 71 is provided between one side of the driving housing 31 and the cover housing 74 And a fixed scroll 72 are provided to constitute the compression unit 7 and a PCB 52 mounted with electronic elements for controlling a current supplied to the stator 33 is installed in the head housing 51 The control unit 5 is constituted.

The revolving scroll 71 is connected to the rotary shaft 37 connected to the rotor 34 through an eccentric bush 39 and is fixed and fixed to the cover housing 74.

An orbiting scroll lap 71a and a fixed scroll lap 72a are formed on opposite surfaces of the orbiting scroll 71 and the fixed scroll 72 respectively and the orbiting scroll lap 71a and the fixed scroll lap 72a ) Are installed in a form interposed therebetween.

Therefore, when the rotary shaft 37 is rotated, the eccentric bush 39 is rotated, and the orbiting scroll 71 connected to the eccentric position with respect to the rotary shaft 37 is pivoted by the eccentric bush 39, The volume of the compression space is reduced between the scroll wraps 71a and the fixed scroll wraps 72a so that the refrigerant flowing between the orbiting scroll wraps 71a and the fixed scroll wraps 72a is compressed and moved to the center, 72b to the high pressure chamber 75 of the cover housing 74 and finally discharged to the outside of the compressor through the discharge port 76 of the cover housing 74. [

The anti-rotation device of the orbiting scroll according to the present invention is installed between the drive housing (31) and the orbiting scroll (71).

The apparatus for preventing rotation of the orbiting scroll according to the present invention includes a rotation preventing ring 100 mounted on one side of a orbiting scroll 71 (a surface on which the orbiting scroll wraps 71a are not formed) (A surface on which the eccentric bush 39 is located as a surface facing the orbiting scroll 71).

As shown in FIG. 4, the anti-rotation ring 100 includes a plurality of sleeve rings 110 and a connecting portion 120 connecting the sleeve rings 110.

The sleeve ring 110 is a simple circular ring and has an inner circumferential surface smoothly machined to reduce friction with the fixing pin 81, and is disposed at equal intervals.

The sleeve rings 110 are arranged at equal intervals on the same circumference, and the connecting portions 120 connect the portions between the respective sleeve rings 110 arranged at equal intervals, and all the connecting portions 120 are also formed on the same circumference . The sleeve ring 110 and the connecting portions 120 must be disposed on the same circumference so that the shape of the anti-rotation ring 100 and the mounting groove for mounting the rotation ring 100 on the orbiting scroll 71 (71d) is simplified, and assembly is facilitated.

The width W1 of the sleeve ring 110 is equal to the width W2 of the connecting portion 120. (W1 = W2)

One side of the orbiting scroll 71 is formed with a sleeve ring groove 71b of the same number as the sleeve ring 110 and a connecting groove 71d is formed between the sleeve ring grooves 71b. That is, the orbiting scroll (71) is formed with a mounting groove having the same shape as that of the anti-rotation ring (100) so that the anti-rotation ring (100)

The rotation ring 100 is mounted on one side of the orbiting scroll 71 in a state where the sleeve ring 110 is inserted into the sleeve ring groove 71b and the connecting portion 120 is inserted into the connecting groove 71d .

5, the fixing pin 81 is press-fitted or screwed into the fixing pin hole 31a formed on one side of the driving unit housing 31 to be fixed thereto.

The number of the fixing pins 81 is the same as the number of the sleeve rings 110. That is, the sleeve ring 110 and the fixing pin 81 correspond one to one, and each fixing pin 81 is inserted into the corresponding sleeve ring 110.

In the assembled state, the sleeve ring 110 and the connecting portion 120 are in close contact with the back plate 83 mounted on one side of the driving housing 31. 5, the widths W1 and W2 of the sleeve ring 110 and the connecting portion 120 are the same, and the width of the backing plate 83 is substantially the same as that of the backing plate 83. However, It is easy to see that the connection part 120 is in close contact with the surface of the back plate 83 like the sleeve ring 110 because the connection part is a flat body.

That is, according to the present invention, there is no step d between the sleeve ring 110 and the back plate 83 as in the prior art (refer to FIG. 2), and the connecting portion 120 connecting the sleeve rings 110, The rotation preventing ring 100 is compressed between the orbiting scroll 71 and the drive housing 31 because the connection portion 120 is also in close contact with the back plate 83 because the ring portion 110 has the same width W1 = W2 as the ring 110. [ It is possible to prevent the refrigerant flowing into the portion 7 from flowing into the connection portion between the orbiting scroll 71, the eccentric bush 39 and the rotary shaft 37. [ That is, the anti-rotation ring 100 may serve as a conventional tip chamber 82 instead.

For this purpose, the anti-rotation ring 100 is made of PTFE (Polytetrafluoroethylene).

PTFE is a material excellent in high compression strength, low friction coefficient, self-lubricating ability, abrasion resistance and corrosion resistance, and is installed in a space where a refrigerant containing lubricating oil flows, and has a tip chamber It is a material suitable for use as a tip seal.

The operation and effect of the present invention will now be described.

When the stator 33 is excited by the power supplied through the control unit 5, the rotor 33 is rotated, the rotary shaft 37 connected to the rotor 33 is rotated, and the eccentric bush (39) is rotated.

Therefore, the orbiting scroll 71 connected to the eccentric bush 39 is pivoted (revolved) with respect to the fixed scroll 72 mounted on the cover housing 74, so that the orbiting scroll 71 and the fixed scroll wrap 72a The volume of the compression space formed decreases toward the centers of the orbiting scroll 71 and the fixed scroll 72 to gradually reduce the volume of the refrigerant introduced into the orbiting scroll 71 and the fixed scroll 72, To the center of the fixed scroll 72 and then to the high pressure chamber 75 of the cover housing 74 through the discharge port 72b of the fixed scroll 72. Then the flow path in the cover housing 74 And is discharged through a discharge port 76. [

Since the rotational force is received by the eccentric bush 39 and the orbiting scroll 71 is rotated by the eccentric bush 39 when the orbiting scroll 71 is rotated, the electric power is transmitted to the orbiting scroll 71 as well. However, since the end of the fixing pin 81 mounted on the driving housing 31 and fixed in position is inserted into the sleeve ring 110 of the anti-rotation ring 100, the sleeve ring 110 is inserted into the fixing pin 81). A plurality of the sleeve rings 110 are provided at regular intervals in the circumferential direction of the orbiting scroll 71. Since the corresponding fixing pins 81 are inserted in each of the sleeve rings 110, (Revolution) corresponding to the pivoting movement of the fixing pin 81 along the inner circumferential surface of the sleeve ring 110, the rotation of the fixing ring 81 is not performed. That is, the rotation of the orbiting scroll (71) is prevented by the sleeve ring (110) and the fixing pin (81).

When the rotation preventing ring 100 is mounted on the orbiting scroll 71, that is, when the sleeve ring 110 is inserted into the sleeve groove 71b and the connecting portion 120 is inserted into the connecting groove 71d, One end of the sleeve ring 110 and the connecting portion 120 is connected to the back portion of the revolving scroll 71 which is mounted on the driving housing 31 while the rotation preventing ring 100 surrounds the inner side of the orbiting scroll 71 The spaces on the side of the compression section 7 of the drive housing 31 and the spaces where the orbiting scroll 71 and the eccentric bushes 39 are connected with respect to the rotation prevention ring 100 are interlocked do.

The refrigerant flowing into the side space of the compression section 7 does not leak to the inner space of the drive section housing 31 through the gap between the orbiting scroll 71 and the back plate 83, It is possible to smoothly compress the refrigerant between the fixed scroll (72).

That is, the anti-rotation ring 100 according to the present invention can replace the function of the existing tip chamber 82.

Therefore, it is not necessary to provide the tip seal 82 on the surface of the orbiting scroll 71 that faces the drive housing 31, and thus it is not necessary to form the tip seal groove 71c for installing the tip seal 82. [

In addition, the anti-rotation ring 100 includes a plurality of sleeve rings 110 connected to each other by a connecting portion 120 to form a single component.

Therefore, in the related art, a plurality of sleeve rings have to be assembled separately and a separate tip chamber has to be assembled separately, which requires cumbersome and time-consuming assembly. However, according to the present invention, It is easy to assemble and takes less time to assemble.

On the other hand, the anti-rotation ring 100 is made of PTFE (Teflon) material and has a small coefficient of friction, and is excellent in compression strength, self-lubricating property, abrasion resistance, and corrosion resistance.

Accordingly, the lubricant is chemically reacted with the refrigerant containing the lubricant, so that the physical properties do not change, and friction with the back plate 83 can be used for a long time without premature wear.

Since the anti-rotation ring 100 is not made of a metal material, metallic noise due to friction and friction between the sleeve ring 110 and the fixing pin 81 does not occur during orbiting operation of the orbiting scroll 71. When the rotation preventing ring 100 is made of Teflon, the lubricating oil contained in the refrigerant penetrates into the fine voids on the surface to form the lubricating film, so that when the fixing pin 81 friction moves along the inner circumferential surface of the sleeve ring 110, The ring 110 and the fixing pin 81 are smoothly lubricated, and noise due to friction is not generated. As described above, since the anti-rotation ring 100 is made of Teflon, the operating noise of the compressor is reduced.

As described above, according to the present invention, since the number of parts constituting the anti-rotation device of the orbiting scroll is reduced, the anti-rotation ring is made of Teflon, and the function of the existing tip chamber can be smoothly performed. There is an effect that operating noise is reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is understandable. Accordingly, the true scope of the present invention should be determined by the following claims.

3: driving unit 5:
7: Compression part 31: Drive part housing
32: intermediate housing 33: stator
34: Rotor 37:
38: Suction port 39: Eccentric Bush
71: fixed scroll 71a: fixed scroll wrap
71b: Sleeve ring groove 71d: Connection groove
72: orbiting scroll 72a: orbiting scroll wrap
73: compression chamber 74: cover housing
75: high pressure chamber 76: discharge port
81: Fixing pin 83: Back plate
100: anti-rotation ring 110: sleeve ring
120: Connection

Claims (13)

A plurality of sleeve rings (110) mounted on the orbiting scroll (71);
A connection part 120 connecting the sleeve ring 110 to form one anti-rotation ring 100;
And a fixing pin 81 mounted on the driving housing 31 at the same number as the sleeve ring 110 and having one end inserted into the sleeve ring 110,
The sleeve ring 110 and the connecting portion 120 of the anti-rotation ring 100 are brought into close contact with the back plate 83 mounted on the drive housing 31, so that the clearance between the orbiting scroll 71 and the drive housing 31 The scroll compressor comprising: a scroll compressor; The method according to claim 1,
Wherein the anti-rotation ring (100) is installed so as to surround the periphery of a portion where the orbiting scroll (71) and the rotary shaft (37) of the scroll compressor are connected. The method of claim 2,
Wherein the sleeve ring (110) and the connecting portion (120) of the anti-rotation ring (100) are arranged at equal intervals on the same circumference, and the connecting portion (120) is connected between the respective sleeve rings A device for preventing rotation of a scroll of a compressor. The method of claim 2,
Wherein the width of the sleeve ring (110) of the anti-rotation ring (100) and the connecting portion (120) is the same. delete The method of claim 2,
Wherein the orbiting scroll (71) is formed with a sleeve ring groove (71b) and a connecting portion groove (71d) into which the sleeve ring (110) of the anti-rotation ring (100) Anti-rotation device. The method according to claim 1,
Wherein the anti-rotation ring (100) is made of PTFE (Polytetrafluoroethylene).

A plurality of sleeve rings (110) mounted on the orbiting scroll (71);
A connection part 120 connecting the sleeve ring 110 to form one anti-rotation ring 100;
And a fixing pin 81 mounted on the driving housing 31 at the same number as the sleeve ring 110 and having one end inserted into the sleeve ring 110,
Wherein the width of the sleeve ring (110) of the anti-rotation ring (100) and the connecting portion (120) is the same. The method of claim 8,
Wherein the anti-rotation ring (100) is installed so as to surround the periphery of a portion where the orbiting scroll (71) and the rotary shaft (37) of the scroll compressor are connected. The method of claim 9,
Wherein the sleeve ring (110) and the connecting portion (120) of the anti-rotation ring (100) are arranged at equal intervals on the same circumference, and the connecting portion (120) is connected between the respective sleeve rings A device for preventing rotation of a scroll of a compressor. The method of claim 10,
The sleeve ring 110 and the connecting portion 120 of the anti-rotation ring 100 are brought into close contact with the back plate 83 mounted on the drive housing 31, so that the clearance between the orbiting scroll 71 and the drive housing 31 The scroll compressor comprising: a scroll compressor; The method of claim 9,
Wherein the orbiting scroll (71) is formed with a sleeve ring groove (71b) and a connecting portion groove (71d) into which the sleeve ring (110) of the anti-rotation ring (100) Anti-rotation device. The method of claim 8,
Wherein the anti-rotation ring (100) is made of PTFE (Polytetrafluoroethylene).

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