JP2014134103A - Scroll-type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll-type compressor having an autorotation prevention mechanism capable of reducing vibration caused in association with reciprocating-motion of an autorotation preventing member.SOLUTION: An autorotation prevention mechanism is constituted by interposing a plurality of autorotation preventing members 28 having cylindrical protrusions 28b, 28c on both surfaces of a planar member 28a, between an end plate of a movable scroll 10 and an inner wall of a bearing member 24 opposing to the end plate. Thus, a vibration force caused by reciprocating-motion of the autorotation preventing members 28 can be suppressed, thanks to miniaturization and light weight, to reduce vibration and prevent generation of noise.

Description

  The present invention relates to a scroll type compressor, and more particularly to a rotation prevention mechanism for allowing a movable scroll to revolve without rotating.

  The compression mechanism portion of a conventional scroll compressor includes a fixed scroll and a movable scroll, and spiral bodies standing on end plates of the scrolls mesh with each other to form a working chamber therebetween. As the fluid compression operation, the movable scroll revolves without rotating with respect to the fixed scroll, so that the working chamber is contracted to compress the fluid.

  Further, in order to revolve the movable scroll, an Oldham coupling is formed between the movable scroll and a bearing member that supports the movable scroll. The Oldham joint will be described. The joint includes an Oldham ring interposed between the movable scroll and the bearing member.

  The Oldham ring has a pair of upper keys projecting from the upper surface of an annular ring body at positions facing each other across the center of the ring body, and in the circumferential direction of the ring body with respect to the upper key. A pair of lower keys project from the lower surface of the ring body at a position shifted by 90 °.

  A pair of grooves into which the upper keys are slidably fitted are provided on the lower surface of the movable scroll, and the lower keys are slid on the upper surface of the bearing member in a direction perpendicular to the sliding direction of the upper keys. A pair of grooves that fits freely is formed. Each key is fitted in the groove, the Oldham ring reciprocates linearly with respect to the bearing member, and the movable scroll reciprocates linearly with respect to the Oldham ring in a direction perpendicular to the reciprocating direction. Thus, the movable scroll is configured to revolve with respect to the bearing member.

  Further, in this type of compressor, a balance weight is provided on the drive shaft or the rotor connected to the movable scroll in order to cancel out the centrifugal force generated by the revolving motion of the movable scroll (for example, , See Patent Document 1).

JP 2000-205153 A

  However, the Oldham ring in the above-described conventional configuration reciprocates linearly with respect to the bearing member, and is therefore a source of excitation force that vibrates the entire compressor in this direction. And this exciting force cannot be canceled by the balance weight. This is because the Oldham ring reciprocates linearly in the horizontal direction, while the balance weight rotates with the rotation of the drive shaft. It was impossible to offset completely. For this reason, in the conventional compressor, the vibration of the whole compressor by the said excitation force cannot be reduced, but it has generate | occur | produced the noise.

  In addition, since the excitation force is proportional to the mass of the Oldham ring, when the Oldham ring is formed of a material having a small specific gravity such as aluminum, sufficient strength cannot be secured with the same size, which has an adverse effect on the compression mechanism. It was.

  In order to solve the above-described conventional problems, a scroll compressor according to the present invention is provided with a first cylindrical protrusion on one surface of a flat member and on the same axis as the first cylindrical protrusion on the opposite surface. A plurality of anti-rotation members provided with a second cylindrical protrusion are interposed between the end plate of the movable scroll and the inner wall of the bearing member facing it, and the end plate of the movable scroll has a first cylindrical shape. The first groove for slidably engaging the protrusion is provided in the same direction, and the second groove for slidably engaging the second cylindrical protrusion is formed on the inner wall of the bearing member. The rotation prevention mechanism provided in the direction orthogonal to the 1st groove | channel provided in is provided.

  With the above configuration, the rotation prevention member does not have an annular ring body that connects a pair of keys, so the mass is greatly reduced, the excitation force associated with linear reciprocation is reduced, and the vibration of the entire compressor is reduced. Can be reduced, and the generation of noise can be prevented.

  In the scroll compressor according to the present invention, the rotation prevention mechanism can reduce the excitation force due to the reciprocating motion of the rotation prevention member, thereby preventing the generation of noise.

Sectional drawing of the scroll type compressor in Embodiment 1 of this invention The perspective view of the rotation prevention member in Embodiment 1 of this invention The top view which showed the rotation prevention mechanism in Embodiment 1 of this invention, and looked at the end plate of the movable scroll, the rotation prevention member, and the bearing member from the movable scroll side The top view which showed the rotation prevention mechanism in Embodiment 2 of this invention, and looked at the end plate of the movable scroll, the rotation prevention member, and the bearing member from the movable scroll side. The perspective view of the rotation prevention member in Embodiment 3 of this invention The perspective view of the rotation prevention member in Embodiment 5 of this invention

  The first invention provides a first cylindrical protrusion on one surface of a flat member, and a second cylindrical protrusion on the same axis as the first cylindrical protrusion on the opposite surface. A plurality of members are interposed between the end plate of the movable scroll and the inner wall of the bearing member opposed thereto, and the first groove in which the first cylindrical protrusion is slidably engaged with the end plate of the movable scroll Are provided in the same direction, and a second groove in which the second cylindrical protrusion is slidably engaged is provided on the inner wall of the bearing member in a direction perpendicular to the first groove provided on the end plate of the movable scroll. As a configuration.

  As a result, the anti-rotation member does not have an annular ring body like the conventional Oldham ring, so it is greatly reduced in size and weight, and the excitation force associated with the linear reciprocation of the anti-rotation member is reduced. Thus, the vibration of the entire compressor can be reduced, and the generation of noise can be prevented. Furthermore, since the rotation preventing member is small and can be produced by simple lathe processing, the cost can be reduced.

  In the second invention, the first and second grooves are arranged at positions shifted from each other by approximately 45 ° from the diameter line. As a result, the angular shift in the circumferential direction of the movable scroll with respect to the bearing member, which occurs in the fitting gap between the cylindrical protrusion and the groove, can be reduced, so that the reduction in compression efficiency and the generation of noise due to the angular shift are prevented. be able to.

  In the third invention, the first and second cylindrical protrusions are constituted by parallel pins inserted through holes provided in the planar member. This eliminates the need for processing the cylindrical protrusion, further increasing productivity and reducing costs.

  4th invention uses bearing steel for the material of a parallel pin, can make hardness larger than a movable scroll or a bearing member, and can prevent wear and seizure.

  According to a fifth aspect of the invention, a cylindrical sleeve is interposed between the first and second cylindrical protrusions and the first and second grooves. As a result, the sleeve can rotate with respect to the cylindrical protrusion, and the groove can be brought into rolling contact with the cylindrical protrusion, thereby enabling smooth sliding and suppressing vibration and noise. Moreover, sliding resistance can be reduced and the reliability with respect to abrasion and image sticking can be further improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a scroll type compressor according to a first embodiment of the present invention, which includes an electric motor 4 and an inverter 7, and is installed horizontally by a mounting leg 2a around a trunk portion. An example of an electric compressor is shown.

  The scroll type electric compressor 1 incorporates a compression mechanism section 3 and an electric motor 4 for driving the compression mechanism section 3 in the main container 2, and the compression mechanism section side opening section 2b and the electric motor side opening section 2c of the main container 2 include The suction sub-container 5 and the discharge sub-container 6 are mounted so as to face each opening, and the main container 2, the suction sub-container 5 and the discharge sub-container 6 form a hermetic compressor container. An inverter 7 that drives the electric motor 4 is built in the suction sub-container 5, and an oil supply device 8 that supplies liquid for lubrication of each sliding portion including the compression mechanism portion 3 is provided in the electric motor side opening 2 c. I have.

  The refrigerant to be handled is a gas refrigerant, and a liquid such as the lubricating oil 16 is employed as a liquid to be used for lubrication of each sliding part and a seal of the sliding part of the compression mechanism part 3. Further, the lubricating oil 16 is compatible with the refrigerant. However, the present invention is not limited to these. Basically, it may be a compressor provided with a compression mechanism unit 3 that sucks, compresses and discharges liquid, and the following description does not limit the description of the scope of claims.

  As shown in FIG. 1, the scroll type electric compressor 1 of the present embodiment includes a fixed scroll 9 in which a spiral body 9b is erected on an end plate 9a and a movable scroll 10 in which a spiral body 10b is erected on an end plate 10a. When the movable scroll 10 is revolved with respect to the fixed scroll 9 by the electric motor 4 via the drive shaft 12 by the electric motor 4, the compression space 11 is formed by meshing with the outer space by changing the volume with movement. The returning refrigerant is sucked, compressed and discharged to the external cycle through the suction port 13 provided in the suction sub-container 5 and the discharge port 14 provided in the discharge sub-container 6.

In addition to this, the lubricating oil 16 stored in the liquid storage part 15 of the discharge sub-container 6 is driven by driving the gear pump 17 or the like with the drive shaft 12 or using the differential pressure in the main container 2. As the movable scroll 10 is driven to revolve through the oil supply passage 18 of the shaft 12, it is supplied to the liquid reservoir 19 on the back surface of the movable scroll 10. A part of the lubricating oil 16 supplied to the liquid reservoir 19 passes through the end plate 10a to the back pressure chamber 20 on the opposite surface of the spiral body 10b on the outer peripheral portion of the movable scroll 10 based on a predetermined restriction such as by the throttle 10c. Supplied. Further, the back pressure is adjusted to a predetermined amount by supplying it to the recess 9c provided in the fixed scroll 9 through the communication hole 10d provided in the movable scroll 10, and the lubricating oil 16 is fixed to the fixed scroll while the movable scroll 10 is pressed and backed up. 9 and the movable scroll 10 are supplied. Thereby, sealing and lubrication between the fixed scroll 9 and the movable scroll 10 are achieved. Further, another part of the lubricating oil 16 supplied to the liquid reservoir 19 is lubricated through the eccentric bearing 23 and the main bearing 21, then flows out to the electric motor 4 side, and is collected in the liquid storage unit 15. The

  Further, a bearing member 24 having an oil supply device 8, a sub bearing 22, an electric motor 4, and a main bearing 21 is arranged from the end wall 2 d side of the electric motor side opening 2 c in the main container 2. The oil supply device 8 accommodates the gear pump 17 from the outer surface of the end wall 2d and holds it with a pump plate 25 attached by bolts (not shown) thereafter, and the liquid storage unit 15 is provided inside the discharge sub-container 6. An oil reservoir chamber 26 is formed so as to communicate with the liquid storage section 15 through an oil suction passage 27. The auxiliary bearing 22 is supported by the end wall 2d, and the side connected to the gear pump 17 of the drive shaft 12 is supported.

  The electric motor 4 fixes the stator 4 a to the inner periphery of the main container 2 by bolts or shrink fitting, and the drive shaft 12 can be driven to rotate by the rotor 4 b fixed around the drive shaft 12. . The bearing member 24 is inserted or press-fitted into the main container 2, and the fixed scroll 9 is attached to the outer surface of the bearing member 24 by which the compression mechanism portion 3 side of the drive shaft 12 is supported by the main bearing 21 by a bolt (not shown) or the like. The scroll compressor is configured by attaching the movable scroll 10 between the bearing member 24 and the fixed scroll 9.

  An eccentric shaft 12a is integrally formed on the end surface of the drive shaft 12, and a bush 29 is fitted and supported on the eccentric shaft 12a. The movable scroll 10 is supported on the bush 29 via an eccentric bearing 23 so as to be capable of revolving motion so as to face the fixed scroll 9. A cylindrical portion 10e protrudes from the back surface of the end plate 10a of the movable scroll 10, and the eccentric bearing 23 is accommodated in the cylindrical portion 10e. The inner ring of the eccentric bearing 23 is fitted to the bush 29, and the outer ring of the eccentric bearing 23 is fitted to the cylindrical portion 10e.

  The compression mechanism unit 3 is covered with a suction sub-container 5 that abuts the main container 2 and the openings and is fixed with a bolt (not shown). The compression mechanism unit 3 is located between the suction port 13 of the suction sub-container 5 and the discharge port 14 of the discharge sub-container 6, and a suction hole (not shown) provided in the end plate 9 a of the fixed scroll 9 A discharge hole 9e connected to the port 13 through the suction passage and provided in the approximate center of the end plate 9a opens into the discharge chamber via the reed valve 31. The discharge chamber communicates with the electric motor 4 between the compression mechanism 3 and the end wall 2d through the fixed scroll 9 and the bearing member 24 or the discharge passage 31 formed between them and the main container 2.

  The lead wire 4c of the electric motor 4 is drawn out to the side of the suction sub-container 5 through the fixed scroll 9 and the bearing member 24 or a communication passage 32 formed between them and the main container 2, and is connected to the end of the lead wire 4c. 4d is connected to the metal terminal 33a of the terminal 33 penetrating the partition wall 5a formed by the suction sub-container 5. Further, the terminal 33 is connected to the inverter 7 in the suction sub container 5.

  As described above, the electric motor 4 is driven by the inverter 7 to cause the compression mechanism portion 3 to revolve through the drive shaft 12 and to drive the gear pump 17. At this time, the compression mechanism section 3 is supplied with the lubricating oil 16 of the liquid storage section 15 by the gear pump 17 and is provided with the suction port 13 of the suction sub-container 5 and its fixed scroll 9 while receiving lubrication, sealing and pressing action. The return refrigerant from the refrigeration cycle is sucked through a suction hole (not shown), compressed, and discharged from its own discharge hole 9e to the discharge chamber. At this time, the inverter 7 is cooled by the return refrigerant. Further, the refrigerant discharged into the discharge chamber enters the electric motor 4 side through the discharge passage 31 and cools the electric motor 4 while further separating the lubricating oil 16 by performing gas-liquid separation such as collision and throttling. It is discharged from the discharge port 14 of the container 6.

Here, in the present embodiment, as shown in FIGS. 1 to 3, the first cylindrical protrusion 28 b is provided on one surface of the planar member 28 a, and on the same axis as the first cylindrical protrusion 28 b on the opposite surface. A plurality of rotation preventing members 28 provided with the second cylindrical protrusions 28c are interposed between the end plate of the movable scroll 10 and the inner wall of the bearing member facing the end plate. Further, a first groove 10f in which the first cylindrical protrusion 28b is slidably engaged with the end plate 10a of the movable scroll is provided in the same direction, and the second cylindrical protrusion 28c slides on the inner wall of the bearing member 24. The second groove 24a that is freely engaged is provided in a direction orthogonal to the first groove 10f provided on the end plate of the movable scroll.

  The operation and action of the rotation prevention mechanism of the scroll compressor constructed as described above will be described below.

  Each cylindrical protrusion is fitted in a groove, the rotation preventing member 28 reciprocates linearly with respect to the bearing member 24, and the movable scroll 10 moves relative to the rotation preventing member 28 with respect to the reciprocating direction described above. The movable scroll 10 revolves with respect to the bearing member 24 by linearly reciprocating in a direction orthogonal to each other. The rotation preventing member 28 does not have an annular ring body like a conventional Oldham ring, and is provided with cylindrical protrusions 28b and 28c on both sides of the planar member 28a, so that it is greatly reduced in size and weight. The excitation force accompanying the linear reciprocation can be reduced, the vibration of the entire compressor can be reduced, and the generation of noise can be prevented. In addition, the structure is simple, and it can be easily manufactured by a lathe as a manufacturing method, and the production cost can be reduced.

(Embodiment 2)
In the present embodiment, as shown in FIG. 4, the first groove 10f and the second groove 24a are configured to be shifted from each other by approximately 45 ° from the diameter line. Thereby, the angular shift | offset | difference of the circumferential direction of the movable scroll 10 with respect to the bearing member 24 which arises in the fitting clearance gap between cylindrical protrusion 28b, 28c and groove | channel 10f, 24a can be reduced. Therefore, it is possible to prevent a decrease in compression efficiency and noise due to the angle shift.

(Embodiment 3)
In the present embodiment, as shown in FIG. 5, the first cylindrical protrusion 28b and the second cylindrical protrusion 28c are constituted by the parallel pins 40 inserted through the holes provided in the planar member 28a. Processing of the protrusions is not necessary, and the productivity can be increased and the cost can be reduced.

(Embodiment 4)
In the present embodiment, since the bearing steel is used as the material of the parallel pin 40, the hardness can be made larger than that of the movable scroll 10 and the bearing member 24, and wear and seizure can be prevented.

(Embodiment 5)
In the present embodiment, as shown in FIG. 6, a cylindrical sleeve 41 is provided between the first cylindrical protrusion 28b and the second cylindrical protrusion 28c and the first groove 10f and the second groove 24a. Intervene. As a result, the sleeve 41 is rotatable with respect to the cylindrical protrusions 28b and 28c, is brought into rolling contact with the grooves 10f and 24a, can be smoothly slid, and vibration and noise can be suppressed. Furthermore, sliding resistance can be reduced and the reliability with respect to wear and seizure can be further improved.

  As described above, the scroll compressor according to the present invention is small and light, and can suppress the excitation force associated with the reciprocating motion of the rotation prevention member, reduce the vibration, and prevent the generation of noise. The present invention can also be applied to a scroll compressor that does not incorporate a motor.

DESCRIPTION OF SYMBOLS 1 Scroll type electric compressor 2 Main container 3 Compression mechanism part 4 Electric motor 9 Fixed scroll 9a End plate 9b Spiral winding body 10 Movable scroll 10a End plate 10b Spiral winding body 10f Groove 11 Compression space 24 Bearing member 24a Groove 28 Self-rotation prevention member 28a Planar member 28b First cylindrical protrusion 28c Second cylindrical protrusion 29 Bush 40 Parallel pin 41 Sleeve

Claims (5)

A movable scroll is provided with an anti-rotation member provided with a first cylindrical protrusion on one surface of the flat member and a second cylindrical protrusion on the same axis as the first cylindrical protrusion on the opposite surface. A plurality of interpositions between the end plate of the movable scroll and the inner wall of the bearing member facing the end plate, and a first groove in which the first cylindrical protrusion is slidably engaged with the end plate of the movable scroll in the same direction A second groove in which the second cylindrical projection is slidably engaged with the inner wall of the bearing member in a direction perpendicular to the first groove provided on the end plate of the movable scroll. A scroll type compressor equipped with an anti-rotation mechanism. 2. The scroll compressor according to claim 1, wherein the first and second grooves are provided at positions shifted from each other by approximately 45 ° from the diameter line. The scroll compressor according to any one of claims 1 and 2, wherein the first and second cylindrical protrusions are configured by parallel pins inserted through holes provided in the planar member. The scroll compressor according to claim 3, wherein a bearing steel is used as a material for the parallel pins. The scroll type according to any one of claims 1 to 4, wherein a cylindrical sleeve is interposed between the first and second cylindrical protrusions and the first and second grooves. Compressor.