JP2005155577A - Scroll type fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll type fluid machine improved in durability of a rotation prevention mechanism to prevent a movable scroll from self-rotating. <P>SOLUTION: The rotation prevention mechanism 10 is interposed between a driving casing 22 and a movable scroll 54 which is driven by a rotating shaft and revolves around a shaft center of a fixed scroll. The mechanism is constructed to comprise: a restraining member 11 restraining self-rotation of the movable scroll; a fixing side pin 14 protruding into the driving casing and engaging with a restraining member; a large-diameter part 15A inserted into the movable scroll toward the restraining member from an direction opposite to the driving casing, and engaged with the movable scroll from an inserting direction to be positioned; and a stepped revolution side pin 15 having a small-diameter section 15a integrally extending from the large-diameter part and protruding from the movable scroll to be engaged with the restraining member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a scroll type fluid machine, for example, a scroll type fluid machine suitable as a compressor for a refrigeration circuit constituting an automotive air conditioning system.

This type of scroll type fluid machine, that is, a scroll type compressor, is provided in a refrigeration circuit, and is disposed in an engine room in an automobile, for example. More specifically, the compressor is connected to an evaporator disposed in an instrument panel that partitions between the engine room and the vehicle compartment via a return line of the circulation line, and is condensed in the forward path of the circulation circuit. A vessel and an expansion valve are inserted.
The compressor includes a scroll unit, that is, a fixed scroll and a movable scroll, and the movable gas is swung with respect to the fixed scroll to suck and compress the working gas from the return path of the circulation pipe. The working gas is discharged toward the condenser.

  In order to perform the orbiting movement of the movable scroll, it is necessary to prevent the rotation of the movable scroll without preventing the revolution of the movable scroll around the rotation axis rotatably supported by the drive casing. Therefore, as the rotation prevention mechanism for preventing the rotation, a scroll in which a plurality of restraining members for restraining the rotation are provided between the driving casing and the movable scroll, and these restraining members are respectively pin-coupled to both the driving casing and the movable scroll. A type compressor (Patent Document 1) is known.

However, if pins are simply connected between the drive casing and the restraining member and between the movable scroll and the restraining member, each pin is lifted from the drive casing or the movable scroll, or the restraining member is tilted. Therefore, there is a problem that uneven wear occurs in each pin and the restraining member.
For this reason, there is a scroll compressor (Patent Document 2) provided with a chamfered portion at the peripheral edge of each pin, and a scroll compressor (Patent Document 3) provided with a flange portion expanded on the pin. Are known. For example, as shown in FIG. 9, when a restraining member is provided between the drive casing and the movable scroll and these restraining members are coupled with a plurality of pins having chamfered portions, it is possible to prevent galling during the coupling. It becomes.
Japanese Unexamined Patent Publication No. 2000-230487 (paragraph numbers 0029 to 0031, FIG. 2, etc.) Japanese Patent Laid-Open No. 2001-90679 (paragraph numbers 0023 to 0028, FIG. 2, etc.) JP 2001-90681 A (paragraph numbers 0074 and 0075, FIG. 17 and the like)

By the way, an aluminum alloy is used for the movable scroll for weight reduction. On the other hand, for the pin, an iron-based material such as SUJ material is used in consideration of strength.
Since a high-temperature and high-pressure compression space is formed in the vicinity of the orbiting center of the movable scroll, the pin fitting hole of the movable scroll also becomes high due to heat conduction. That is, since the materials are different as described above, the hole diameter of the pin fitting hole is larger than the shaft diameter of each pin due to the difference in the linear expansion coefficient. In other words, in this case, there is a problem that the press-fitting holding force of each pin is lowered, and the pins are easily lifted from the movable scroll. This causes galling between the tip end portion of the pin and the drive casing, and also causes the pin to break, reducing the life of the rotation prevention mechanism.

Here, even if the flange portion is provided on the pin, if the hole diameter of the pin fitting hole is enlarged, there arises a problem that the restraining member is easily rotated in a tilted state. This still causes uneven wear on each pin and the restraining member, leading to a reduction in the life of the rotation prevention mechanism. Moreover, there is a problem that providing a separate flange portion is contrary to an increase in the number of parts and space saving.
The present invention has been made in view of such problems, and an object of the present invention is to provide a scroll type fluid machine capable of improving the durability of the rotation preventing mechanism in the movable scroll.

  In order to achieve the above object, a scroll type fluid machine according to claim 1 includes a housing having a drive casing and a compression casing, and a rotary shaft extending through the drive casing and rotatably supported by the drive casing via a bearing. And a scroll unit that is housed in a compression casing and is driven by a rotating shaft to perform a series of processes of suction, compression, and discharge of working gas. The scroll unit is driven by the rotating shaft to A movable scroll that revolves around an axis, and a rotation prevention mechanism that prevents the rotation of the movable scroll without interfering with the revolution of the movable scroll. The rotation prevention mechanism is provided between the drive casing and the movable scroll. And a restraining member that restrains the rotation of the orbiting scroll and a drive casing. A fixed-side pin that engages with the restraining member, and a large-diameter portion and a large-diameter portion that are inserted into the movable scroll from the opposite side of the drive casing toward the restraining member and are engaged and positioned with respect to the movable scroll from the insertion direction. And a stepped turning-side pin having a small-diameter portion that extends integrally from the portion and protrudes from the movable scroll and engages with the restraining member.

According to a second aspect of the present invention, the movable scroll has a stepped pin fitting hole having a small diameter from the side opposite to the drive casing toward the restraining member so as to allow the turning pin to be inserted. The joint hole is characterized by having a caulking portion on the opening peripheral edge opposite to the drive casing.
Furthermore, in the invention according to claim 3, the movable scroll has a large-diameter pin fitting hole and a small-diameter pin fitting hole that are sequentially arranged from the side opposite to the drive casing toward the restraining member so as to allow the turning-side pin to pass therethrough. The length of the small diameter portion is shorter than the distance from the boundary between the large diameter pin fitting hole and the small diameter pin fitting hole to the drive casing.

Furthermore, in the invention described in claim 4, the movable scroll includes a spiral wrap that meshes with the fixed scroll so as to perform a series of processes, and is directed toward the restraining member from the side opposite to the drive casing so as to allow the turning side pin to be inserted. A pin fitting hole with a step having a small diameter, and the pin fitting hole is arranged on the outer peripheral side of the spiral wrap.
According to a fifth aspect of the present invention, there is provided a scroll type fluid machine including a housing having a drive casing and a compression casing, a rotary shaft extending through the drive casing and rotatably supported by the drive casing via a bearing, and a compression casing. And a scroll unit that is driven by the rotating shaft and performs a series of processes of suction, compression, and discharge of working gas. The scroll unit is driven by the rotating shaft and revolves around the axis of the fixed scroll. A movable scroll that is moved, and a rotation prevention mechanism that prevents the rotation of the movable scroll without interfering with the revolving orbiting motion of the movable scroll. The rotation prevention mechanism is interposed between the drive casing and the movable scroll and is movable. A restraining member that restrains the rotation of the scroll, and a projection that protrudes from the drive casing and engages with the restraining member A fixed-side pin, a swing-side pin that protrudes from the movable scroll and engages with the restraining member, and that rotates around the axis of the fixed-side pin while being restricted by the restraining member; and between the restraining member and the fixed-side pin; And a wear reducing means for sliding between the pin and the swivel pin.

Further, the invention according to claim 6 is characterized in that the wear reducing means includes a crowning formed on the outer peripheral surface of the fixed side pin and the turning side pin.
Furthermore, the invention according to claim 7 is characterized in that the wear reducing means includes end reliefs formed on the outer peripheral surfaces of the fixed side pin and the turning side pin.
In the invention according to claim 8, the restraining member has a fixed side engaging hole engaged with the fixed side pin and a turning side engaging hole engaged with the turning side pin, and wear reducing means. Includes a crowning formed in the fixed side engaging hole and the turning side engaging hole.

  Further, in the invention according to claim 9, the restraining member has a fixed side engaging hole engaged with the fixed side pin and a turning side engaging hole engaged with the turning side pin, and wear reducing means. Is composed of a fixed convex part surrounding the opening periphery of the fixed engagement hole and contacting the drive casing, and a turning convex part surrounding the opening periphery of the turning engagement hole and contacting the movable scroll. It is characterized by that.

  Furthermore, in the invention according to claim 10, the drive casing has a fixed-side pin fitting hole into which the fixed-side pin is fitted, and the movable scroll is fitted with the turning-side pin into which the turning-side pin is fitted. The wear reducing means has a fixed convex portion that surrounds the opening periphery of the fixed pin fitting hole and contacts the restraining member, and surrounds the opening periphery of the turning pin fitting hole and contacts the restraining member. It is characterized by being comprised from the turning side convex-shaped part which touches.

  In the eleventh aspect of the invention, the restraining member has a fixed-side engagement hole engaged with the fixed-side pin and a turning-side engaging hole engaged with the turning-side pin, and wear reduction means. Is further characterized by further including an R chamfering or a C chamfering formed at the peripheral edge of the restraining member, the opening peripheral edge of the fixed side engaging hole and the turning side engaging hole.

  Therefore, according to the scroll type fluid machine of the first aspect of the present invention, when the turning side pin of the movable scroll is turned around the axis of the fixed side pin while being restricted by the restraining member, it is movable at the stepped portion. Locked by the scroll, it is possible to prevent the turning-side pin from floating toward the arrangement side of the restraining member. Therefore, it is possible to eliminate the squeezing of the turning side pin with respect to the drive casing, and to improve the durability of the rotation prevention mechanism.

Further, according to the invention of claim 2, since the opening portion on the opposite side of the drive casing of the pin fitting hole, that is, the opening portion on the large diameter side of the pin fitting hole is caulked, In addition to lifting of the restraining member to the arrangement side by the turning side pin, it is possible to prevent lifting to the side where a series of processes is performed.
Furthermore, according to the invention described in claim 3, by setting the length of the small-diameter portion of the orbiting pin, the amount of protrusion of the orbiting pin from the movable scroll can be managed, and the reliability of the scroll unit is improved. be able to. Moreover, this contributes to a reduction in the assembly cost of the scroll unit.

Furthermore, according to the fourth aspect of the present invention, if the pin fitting hole moves away from the center of rotation of the movable scroll, the pin fitting hole is not easily affected even during high temperature and high pressure operation. Therefore, it is possible to reliably prevent the turning-side pins from being lifted.
According to the fifth aspect of the present invention, when the turning-side pin of the movable scroll is swung around the axis of the fixed-side pin while being restricted by the restricting member, it is between the restricting member and the fixed-side pin or the turning-side pin. Wear due to sliding can be prevented. Therefore, the seizure of the sliding portion can be eliminated, and the durability of the rotation prevention mechanism can be improved.

Furthermore, according to the sixth aspect of the present invention, the sliding portions between the restraining member and the fixed side pin and between the restraining member and the turning side pin are only contact portions by curves, and the sliding area is reduced. Wear can be prevented.
Furthermore, according to the seventh aspect of the invention, the sliding portions between the restraining member and the fixed side pin and between the restraining member and the turning side pin are only contact portions due to the taper, and the sliding area is reduced. Wear can be prevented.

Further, according to the invention described in claim 8, the sliding portions between the restraining member and the fixed side pin and between the restraining member and the turning side pin are only contact portions by curves, and the sliding area is reduced. Wear can be prevented.
Further, according to the ninth aspect of the invention, the restraining member is supported by the drive casing and the movable scroll located on both sides of the restraining member, and when the turning side pin turns around the axis of the fixed side pin. The tilted state of the restraining member can be prevented, and the durability of the rotation prevention mechanism can be improved.

Furthermore, according to the invention of claim 10, the drive casing and the movable scroll support the restraining member on both sides thereof, and the restraining member is turned when the turning side pin turns around the axis of the fixed side pin. It is possible to prevent the rotation state of the rotation prevention mechanism and improve the durability of the rotation prevention mechanism.
According to the eleventh aspect of the present invention, the durability of the rotation preventing mechanism can be further improved by performing in addition to the above-described prevention of wear and prevention of the inclination of the restraining member.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a scroll type fluid machine according to a first embodiment.
The fluid machine 4 is a rotary scroll compressor provided with a housing 20. The housing 20 includes a drive casing 22 and a compression casing 24. The drive casing 22 has a stepped cylindrical shape with a large diameter toward the compression casing 24, and has both ends opened. On the other hand, the compression casing 24 has a cup shape that opens toward the large-diameter end of the drive casing 22, and the open end is airtightly fitted to the large-diameter end of the drive casing 22, and is driven through a plurality of connection screws 28. It is connected to the casing 22.

  A rotating shaft 30 is disposed in the drive casing 22, and the rotating shaft 30 also has a stepped shape, and has a small-diameter shaft portion 32 on one end side and a large-diameter end portion 34 on the other end side. The small diameter shaft portion 32 protrudes from the small diameter end of the drive casing 22, and a drive disk 42 is attached to the protruded end via a nut 44. The drive disk 42 is connected to a drive pulley 48 via an electromagnetic clutch 46, and the drive pulley 48 is rotatably supported by the drive casing 22 via a pulley bearing 50.

  The large diameter end 34 is rotatably supported by the drive casing 22 via a needle bearing 36. The small-diameter shaft portion 32 of the rotating shaft 30 is also rotatably supported by the drive casing 22 via a ball bearing 38. Further, a lip seal 40 is disposed between the ball bearing 38 and the needle bearing 36 in the drive casing 22, and the lip seal 40 is in sliding contact with the small-diameter shaft portion 32 of the rotary shaft 30 to drive the drive casing 22. 22 is airtightly partitioned.

  When the electromagnetic clutch 46 is turned on, the electromagnetic clutch 46 integrally connects the drive pulley 48 and the drive disk 42 to rotate the drive disk 42, that is, the rotating shaft 30 in one direction together with the drive pulley 48. . On the other hand, when the electromagnetic clutch 46 is turned off, the electromagnetic clutch 46 releases the connection between the drive pulley 48 and the drive disk 42 and cuts off the transmission of power from the drive pulley 48 to the rotary shaft 30.

  Here, a scroll unit 52 is accommodated in the compression casing 24, and the scroll unit 52 includes a movable scroll 54 and a fixed scroll 56. The movable scroll 54 and the fixed scroll 56 have spiral wraps 54a and 56a that mesh with each other, and the spiral wraps 54a and 56a cooperate with each other to form a compression chamber 58 through a seal. The compression chamber 58 is moved from the radially outer peripheral side of the spiral wraps 54a and 56a toward the center by the revolving motion of the movable scroll 54, and at this time, its volume is reduced.

  In order to achieve the turning motion of the movable scroll 54 described above, the substrate 60 of the movable scroll 54 has a boss 62 protruding toward the drive casing 22, and this boss 62 is rotatably supported by an eccentric bush 66. ing. The eccentric bush 66 is supported by a crank pin 68, and the crank pin 68 protrudes eccentrically from the large-diameter end portion 34 of the rotating shaft 30. Therefore, as the rotary shaft 30 rotates, the movable scroll 54 performs a turning motion via the crank pin 68 and the eccentric bush 66.

A counterweight 70 is attached to the eccentric bush 66 via a connecting pin 71 so as to be sandwiched between the eccentric bush 66 and the large-diameter end portion 34, and the counterweight 70 has a plurality of large and small counterweights 70. These arc-shaped plates are superposed to provide a balance weight for the orbiting movement of the movable scroll 54.
The fixed scroll 56 is fixed in the compression casing 24, and the substrate 78 partitions the inside of the compression casing 24 into the compression chamber 58 side and the discharge chamber 80. A discharge hole 82 connected to the compression chamber 58 is formed in the center of the substrate 78, and the discharge hole 82 is opened and closed by a reed valve 84. The reed valve 84 is attached to the outer surface of the substrate 78 together with the valve retainer 86 via bolts. Although not shown, a suction port and a discharge port communicating with the compression chamber 58 and the discharge chamber 80, respectively, are formed in the peripheral wall of the compression casing 24, and the suction port is connected to the return path of the above-described circulation pipe. The discharge port is connected to the forward path of the circulation pipeline.

  In the compressor 4, as the rotary shaft 30 rotates, the movable scroll 54 orbits through the crank pin 68 and the eccentric bush 66. At this time, the rotation of the movable scroll 54 is prevented by the rotation preventing mechanism 10. As a result, the movable scroll 54 orbits with respect to the fixed scroll 56 with its orbiting posture maintained constant, and this orbiting motion sucks the working gas into the compression chamber 58 from the circulation path through the suction port, A series of processes for compressing the sucked working gas and discharging the compressed working gas into the discharge chamber 80 through the reed valve 84 is performed. Thereafter, the compressed working gas is discharged from the discharge chamber 80 through the discharge port. Supplied to the circulation line.

Details of the rotation prevention mechanism 10 are shown in FIG. 2, and the rotation prevention mechanism 10 includes a plurality of restraining members 11 interposed between the large-diameter end of the drive casing 22 and the substrate 60 of the movable scroll 54. ing. The restraining member 11 is pin-coupled to both the drive casing 22 and the movable scroll 54.
More specifically, as shown in FIG. 5A, the movable scroll 54 has a large-diameter pin fitting hole 54i having an opening on the surface on the compression chamber 58 side where the above-described series of processes is performed, and the large-diameter pin fitting. A small-diameter pin fitting hole 54j that communicates with the joint hole 54i and has an opening on the surface on the arrangement side of the restraining member 11 is provided. These are arranged on the same axis, and four are arranged at equal intervals at an appropriate position on the outer peripheral side of the arrangement position of the spiral wrap 54a (FIG. 3).

In particular, the length L1 of the large-diameter pin fitting hole 54i is set so that the turning-side pin 15 does not come into contact with the drive casing 22. That is, the dimensions are managed so that the turning-side pin 15 protrudes from the movable scroll 54 by the protrusion amount L2. The drive casing 22 is provided with a pin fitting hole 22h.
The restraining member 11 is arranged such that one end surface thereof faces the drive casing 22 and the other end surface thereof faces the movable scroll 54 via the thrust plate 18. Further, the restraining member 11 is provided with a fixed side engaging hole 12 that engages with the fixed side pin 14 and a turning side engaging hole 13 that engages with the turning side pin 15, and these are arranged in the longitudinal direction of the restraining member 11. (FIG. 2B).

  The turning-side pin 15 includes a small-diameter portion 15a and a large-diameter portion 15A, and is a stepped pin having a small diameter from the compression chamber 58 side toward the restraining member 11. And it inserts in the movable scroll 54 from the compression chamber 58 side by making the small diameter part 15a of the turning side pin 15 into the head. Subsequently, the large diameter portion 15 </ b> A is also inserted into the movable scroll 54. When the small-diameter portion 15a is fitted into the pin fitting hole 54j and the large-diameter portion 15A is fitted into the pin fitting hole 54i, the small-diameter portion 15a protrudes from the movable scroll 54 with the protrusion amount L2, but the drive casing 22 is further increased. It does not protrude to the side.

  Next, the protruding portion of the turning side pin 15 is engaged with the turning side engaging hole 13 of the restraining member 11. On the other hand, the fixed-side pin 14 is fitted into the pin fitting hole 22 h of the drive casing 22 from the restraining member 11 side, and the protruding portion is engaged with the turning-side engaging hole 13 of the restraining member 11. When the movable scroll 54 is revolved around the axis of the fixed scroll 56, the turning side pin 15 is turned around the fixed side pin 14 while being restricted by the restraining member 11.

  Thus, according to the rotation prevention mechanism 10 of the embodiment, the turning-side pin 15 does not float to the drive casing 22 side due to the fitting between the large-diameter portion 15A of the turning-side pin 15 and the pin fitting hole 54i. Therefore, the turning-side pin 15 is not galling with respect to the drive casing 22, and the durability of the rotation prevention mechanism 10 is improved. Further, when the protruding amount of the turning-side pin 15 is managed, the reliability of the scroll unit 52 is improved and the assembling cost is reduced.

In addition, if the pin fitting holes 54i and 54j are further away from the rotation center of the movable scroll 54, that is, the high-temperature and high-pressure compression chamber, it becomes difficult to be affected by the heat from the compression chamber 58, and the swivel pin 15 is lifted. It can be surely prevented.
Incidentally, the pin fitting hole 54i may be caulked. Specifically, as shown in FIG. 4, if a caulking portion 54k is provided at the opening peripheral edge of the pin fitting hole 54i, the turning-side pin 15 is lifted to the drive casing 22 side, and further to the compression chamber 58 side. It is also possible to prevent the floating of the.

Next, FIG. 5 shows a second embodiment of the present invention. Since the second embodiment has the same configuration as that of the first embodiment except for the point of the rotation prevention mechanism, the point of the rotation prevention mechanism will be described in detail.
Details of the rotation prevention mechanism 10B are shown in FIG. 6, and the rotation prevention mechanism 10B includes a restraining member 11B interposed between the large diameter end of the drive casing 22 and the substrate 60 of the movable scroll 54. . The restraining member 11B is pin-coupled to both the drive casing 22 and the movable scroll 54.

More specifically, as shown in FIG. 5A, the movable scroll 54 is provided with four pin fitting holes 54h fitted to the turning side pin 15 at equal intervals. On the other hand, the drive casing 22 is also provided with four pin fitting holes 22h that are fitted to the fixed side pins 14 at equal intervals.
The rotation preventing mechanism 10B of the present embodiment has a wear reduction means 19 to eliminate seizure of the sliding portions between the restraining member 11B and the fixed side pin 14B and between the restraining member 11B and the turning side pin 15B. Is provided.

  That is, the restraining member 11B is formed with a fixed-side engagement hole 12B that engages with the fixed-side pin 14B. The opening-side periphery of the fixed-side engagement hole 12B on the side of the drive casing 12 is surrounded by the drive-side casing 12B. The fixed-side convex shape portion 16 that comes into contact with is fixed. The restraining member 11B is also formed with a turning-side engaging hole 13B that engages with the turning-side pin 15B, and the opening peripheral edge of the turning-side engaging hole 13B on the movable scroll 54 side also surrounds the opening edge and is movable. A turning-side convex portion 17 that contacts the scroll 54 is provided. These convex-shaped parts 16 and 17 are juxtaposed in the longitudinal direction of the restraining member 11B (FIG. 6B).

  The fixed convex portion 16 and the turning convex portion 17 function as wear reducing means 19. That is, since the restraining member 11B is supported by the drive casing 12 by the fixed convex portion 16 and by the movable scroll 54 by the turning convex portion 17, the rotation of the restraining member 11B in the inclined state is performed. This is because it is prevented and uneven wear hardly occurs in each of the pins 14B and 15B and the restraining member 11B. This improves the durability of the rotation prevention mechanism 10B.

  The turning-side pin 15B is fitted into the pin fitting hole 54h of the movable scroll 54 from the restraining member 11B side. Next, the protruding portion is engaged with the turning-side engaging hole 13B of the restraining member 11B having the turning-side convex portion 17. On the other hand, the fixed-side pin 14B is fitted into the pin fitting hole 22h of the drive casing 22 from the restraining member 11B side, and the protruding portion is engaged with the turning-side engaging hole 13B of the restraining member 11B having the fixed-side convex portion 16. Combined. When the movable scroll 54 is revolved around the axis of the fixed scroll 56, the turning side pin 15B is turned around the fixed side pin 14B while being restricted by the restraining member 11B.

  By the way, a drive casing and a movable scroll may be provided with the convex-shaped part. Specifically, as shown in FIG. 7, the drive casing 22C has a fixed-side convex portion 22P that abuts against the restraining member 11C outside the opening periphery of the pin fitting hole (fixed-side pin fitting hole) 22h. The movable scroll 54C has a turning-side convex portion 54P that comes into contact with the restraining member 11C outside the outer periphery of the pin fitting hole (turning-side pin fitting hole) 54h. In this case, since the fixed-side convex portion 22P and the turning-side convex portion 54P function as the wear reducing means 19, rotation of the restraining member 11C in the tilted state is prevented, and the pins 14C and 15C and the restraining member 11C are prevented. It is difficult for uneven wear to occur.

  Further, the wear reducing means 19 may be the following cases in addition to the above-described embodiments. That is, as shown in FIG. 8A, the fixed side pin 14D and the turning side pin 15D are crowned, and the outer peripheral surface of each pin is formed with a smooth curve. Furthermore, as shown in FIG. 6B, end relief is applied to the fixed side pin 14E and the turning side pin 15E, and the outer peripheral surface of each pin is formed with a slight taper. Furthermore, as shown in FIG. 10C, the fixing side engaging hole 12F and the turning side engaging hole 13F of the restraining member 11F are crowned, and each hole surface is formed with a smooth curve. As a result, the sliding portions between the restraining members 11D, 11E, 11F and the fixed pins 14D, 14E, 14F, and between the restraining members 11D, 11E, 11F and the turning pins 15D, 15E, 15F are curved and Only the contact portion due to the taper is provided, and the sliding area is reduced to prevent wear.

The description of one embodiment of the present invention is finished above, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, four restraint members are arranged at equal intervals, but the present invention is not necessarily limited to this embodiment. Moreover, it is also possible to combine each Example suitably.

  Further, the wear reducing means may be one in which the chamfering is further performed on the peripheral edge of the restraining member or the opening peripheral edge of the fixed side engaging hole and the swivel side engaging hole. There is an effect that the durability of the mechanism is further improved.

It is a section lineblock diagram of the scroll type fluid machine concerning a 1st embodiment of the present invention. (A) is a principal part enlarged view of the scroll type fluid machine of FIG. 1, (b) is arrow sectional drawing. It is a front view of the movable scroll in the scroll type fluid machine of FIG. It is a principal part enlarged view of the scroll type fluid machine in another Example. It is a section lineblock diagram of the scroll type fluid machine concerning a 2nd embodiment of the present invention. (A) is a principal part enlarged view of the scroll type fluid machine of FIG. 5, (b) is an arrow directional cross-sectional view. It is a principal part enlarged view of the scroll type fluid machine in another Example. It is a principal part enlarged view of the scroll type fluid machine in further another Example. It is a principal part enlarged view of the conventional scroll type fluid machine.

Explanation of symbols

4 Scroll type fluid machine 10, 10A to 10F Rotation prevention mechanism 11, 11A to 11F Restraining member 12, 12A to 12F Fixed side engaging hole 13, 13A to 13F Turning side engaging hole 14, 14A to 14F Fixed side pin 15, 15a, 15A-15F Revolving side pin 16 Fixed side convex portion 17 Revolving side convex shape portion 19 Wear reduction means 20 Housing 22, 22C Drive casing 22h Pin fitting hole (fixed side pin fitting hole)
22P Fixed-side convex part 24 Compression casing 30 Rotating shaft 36 Bearing 58 Compression chamber 60 Substrate 50 Bearing 52 Scroll unit 54, 54C Movable scroll 54a Spiral wrap 54h Pin fitting hole (turning side pin fitting hole)
54i Large-diameter pin fitting hole 54j Small-diameter pin fitting hole 54k Caulking portion 54P Turning-side convex shape portion 56 Fixed scroll

Claims (11)

A housing having a drive casing and a compression casing;
A rotating shaft extending through the drive casing and rotatably supported by the drive casing via a bearing;
A scroll unit housed in the compression casing and driven by the rotating shaft to perform a series of processes of suction, compression and discharge of working gas;
The scroll unit
A movable scroll driven by the rotary shaft and revolved around the axis of the fixed scroll;
A rotation prevention mechanism for preventing rotation of the movable scroll without impeding the revolving orbiting motion of the movable scroll,
The rotation prevention mechanism is
A restraining member interposed between the drive casing and the movable scroll to restrain the rotation of the movable scroll;
A fixed-side pin protruding from the drive casing and engaging with the restraining member;
A large-diameter portion that is inserted into the movable scroll from the opposite side of the drive casing toward the restraining member, and is engaged with the movable scroll from the insertion direction and positioned, and extends integrally from the large-diameter portion. And a stepped orbiting side pin having a small-diameter portion that protrudes from the movable scroll and engages with the restraining member.   The movable scroll has a stepped pin fitting hole having a small diameter toward the restraining member from the side opposite to the drive casing so as to allow the turning side pin to pass through the pin. 2. The scroll type fluid machine according to claim 1, further comprising a caulking portion on an opening peripheral edge opposite to the drive casing.   The movable scroll has a large-diameter pin fitting hole and a small-diameter pin fitting hole that are sequentially arranged from the side opposite to the drive casing toward the restraining member so that the turning-side pin is inserted, The scroll type fluid machine according to claim 1, wherein a length of the portion is shorter than a distance from a boundary between the large-diameter pin fitting hole and the small-diameter pin fitting hole to the drive casing. .   The movable scroll includes a spiral wrap that meshes with the fixed scroll so as to perform the series of processes, and a step having a small diameter from the side opposite to the drive casing toward the restraining member so that the turning side pin is inserted. 2. The scroll fluid machine according to claim 1, further comprising: a pin fitting hole with a pin, the pin fitting hole being disposed on an outer peripheral side of the spiral wrap. A housing having a drive casing and a compression casing;
A rotating shaft extending through the drive casing and rotatably supported by the drive casing via a bearing;
A scroll unit housed in the compression casing and driven by the rotating shaft to perform a series of processes of suction, compression and discharge of working gas;
The scroll unit
A movable scroll driven by the rotary shaft and revolved around the axis of the fixed scroll;
A rotation prevention mechanism for preventing rotation of the movable scroll without impeding the revolving orbiting motion of the movable scroll,
The rotation prevention mechanism is
A restraining member interposed between the drive casing and the movable scroll to restrain the rotation of the movable scroll;
A fixed-side pin protruding from the drive casing and engaging with the restraining member;
A revolving side pin that protrudes from the movable scroll and engages with the restraining member and revolves around the axis of the fixed side pin while being restricted by the restraining member;
A scroll type fluid machine comprising: wear reducing means for sliding between the restraining member and the fixed side pin and between the restraining member and the turning side pin.   The scroll type fluid machine according to claim 5, wherein the wear reducing means includes a crowning formed on an outer peripheral surface of the fixed side pin and the turning side pin.   6. The scroll type fluid machine according to claim 5, wherein the wear reducing means includes end reliefs formed on outer peripheral surfaces of the fixed side pin and the turning side pin. The restraint member has a fixed-side engagement hole engaged with the fixed-side pin, and a turning-side engaging hole engaged with the turning-side pin,
The scroll type fluid machine according to claim 5, wherein the wear reducing means includes a crowning formed in the fixed side engaging hole and the turning side engaging hole. The restraint member has a fixed-side engagement hole engaged with the fixed-side pin, and a turning-side engaging hole engaged with the turning-side pin,
The wear reducing means includes a fixed convex portion that surrounds the opening periphery of the fixed engagement hole and contacts the drive casing, and a swing that surrounds the opening periphery of the turning engagement hole and contacts the movable scroll. The scroll type fluid machine according to claim 5, wherein the scroll type fluid machine is configured by a side convex portion. The drive casing has a fixed side pin fitting hole into which the fixed side pin is fitted, and the movable scroll has a turning side pin fitting hole into which the turning side pin is fitted,
The wear reducing means surrounds the opening periphery of the fixed side pin fitting hole and contacts the restraining member, and surrounds the opening periphery of the turning side pin fitting hole and contacts the restraining member. The scroll type fluid machine according to claim 5, wherein the scroll type fluid machine is configured to be in contact with a turning-side convex portion. The restraint member has a fixed-side engagement hole engaged with the fixed-side pin, and a turning-side engaging hole engaged with the turning-side pin,
11. The wear reducing means further includes R chamfering or C chamfering formed on the peripheral edge of the restraining member, the opening peripheral edge of the fixed side engagement hole, and the turning side engagement hole. The scroll type fluid machine according to any one of the above.

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