JP2012225257A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for a scroll compressor that can compactly house components in a height direction, secures a surface pressure on a claw of an Oldham's ring by suppressing weight increase, and does not interfere with peripheral parts.SOLUTION: An almost ring-shaped thrust bearing 112 for bearing a swing scroll 102 in a thrust direction is arranged between the swing scroll 102 and a bottom part 104a of a frame 104. The thrust bearing 112 is housed in a recess 102e that is formed at an outer circumference of a back surface of a base plate 102c of the swing scroll 102.

Description

  The present invention relates to a scroll compressor mounted on an air conditioner, a refrigerator, or the like.

  First, the structure and operation of the conventional scroll compressor described in Patent Document 1 will be described with reference to FIGS. 8 and 9. FIG. 8 is a longitudinal sectional view of a conventional scroll compressor, and FIG. 9 is an enlarged sectional view of a main part of FIG.

  8 and 9, a compression mechanism including a fixed scroll 101 and an orbiting scroll 102 is provided in the upper part of the shell 103. The orbiting scroll 102 is slidably supported in the thrust direction by a frame 104 fixed to the inner peripheral surface of the shell 103 on the rear surface near the outer periphery.

  A bearing hole portion 102b is formed in a boss portion 102a provided in the vicinity of the center of the back surface of the swing scroll 102, and an eccentric shaft portion 105a formed at the upper end portion of the main shaft 105 is formed in the bearing hole portion 102b. And are housed in a state of being slidably engaged in the circumferential direction. The main shaft 105 is axially supported in a radial direction by a main bearing 104b formed on a bottom 104a of a bottomed cylindrical frame 104 having an open upper end, and a rotor 105c is fixed to the outer periphery, and is rotated by an electric motor 106. Driven.

  An Oldham ring accommodating portion 104 c for accommodating the Oldham ring 107 is formed at the center of the upper surface of the bottom portion 104 a of the frame 104. The Oldham ring 107 is configured to be slidable in a predetermined direction with respect to the bottom surface of the Oldham ring housing portion 104c, and to be slidable in a direction perpendicular to the rear surface of the swing scroll 102 with respect to the predetermined direction.

  An oil sump 108 is formed at the bottom of the shell 103, and a pump for pumping the lubricating oil in the oil sump 108 to the lower end of the main shaft 105 and supplying it to the bearing hole 102b, the main bearing 104b and the Oldham ring accommodating part 104c. 109 is provided. In addition, an oil hole 105 b that is an oil supply path is provided in the main shaft 105.

  Next, the operation of the above-described conventional scroll compressor will be described. When the main shaft 105 is rotationally driven by the electric motor 106, the rotation is transmitted to the orbiting scroll 102 that engages with the main shaft 105 in the eccentric shaft portion 105a and the bearing hole portion 102b. At this time, since the Oldham ring 107 reciprocating in the Oldham ring accommodating portion 104c prevents the swinging scroll 102 from rotating, the swinging scroll 102 performs a revolving motion and cooperates with the fixed scroll 101. The refrigerant gas is compressed by the compression principle of a known scroll compressor.

  When the main shaft 105 rotates, the lubricating oil in the oil sump 108 is sucked by the pump 109. As a result, as shown by the arrow in FIG. 9, the lubricating oil lubricates the bearing hole portion 102b and the main bearing 104b through the main shaft oil hole 105b, and then the back surface of the orbiting scroll 102 and the Oldham ring housing portion 104c. It reaches the inner space 110 formed with the Oldham ring 107 as a boundary between the bottom surface and the bottom surface. Then, it reaches the outer space 111 of the Oldham ring 107 through a gap between the upper surface of the Oldham ring 107 and the back surface of the orbiting scroll 102, and is further discharged out of the frame 104 through an oil drain hole 104d drilled in the frame 104. Return to sump 108.

  In the conventional scroll compressor described above, during the operation, the revolving motion is caused while the orbiting scroll 102 is strongly pressed against the frame 104 by the axial repulsion force (hereinafter referred to as “thrust load”) by the compressed gas in the spiral. To do. As a result, the lower surface of the orbiting scroll 102 slides and wears due to the thrust load, and in the worst case, the orbiting scroll 102 is seized on the frame 104.

  In order to avoid such a situation, in the scroll compressor described in Patent Document 2, a thrust receiver is disposed on the sliding contact surface between the swing scroll 102 and the frame 104. By receiving the thrust load by the thrust receiver, sliding wear on the lower surface of the swing scroll 102 due to the thrust load can be suppressed, and seizure with the frame 104 can be prevented.

See JP-A-7-18961 JP 2007-146813 A

  When a thrust receiver is provided between the orbiting scroll 102 and the frame 104, the orbiting scroll 102, the Oldham ring 107, and the thrust receiver must be arranged in a limited space between the fixed scroll 101 and the frame 104. I must.

  However, the rocking scroll 102 must be provided with a groove portion for accommodating the claw portion of the Oldham ring 107, and the base plate of the rocking scroll 102 needs to have a certain thickness, which increases the volume of the compressor. In addition, if the thrust receiver is attached to the back of the orbiting scroll 102 so that the thrust receiver does not interfere with surrounding parts during compressor operation, the centrifugal force of the orbiting scroll 102 increases and causes abnormal wear or seizure of the bearing. It becomes.

  Further, by disposing the thrust receiver on the back surface of the orbiting scroll 102, it becomes impossible to secure the surface pressure between the claw-portion receiving groove of the Oldham ring 107 and the claw of the Oldham ring 107 provided on the back surface. This will cause abnormal wear on the nails.

  The present invention has been made to solve the above problems, and by devising the arrangement of the thrust receiver, it can be stored compactly in the height direction, and the surface pressure of the nail of the Oldham ring can be secured by suppressing the increase in weight. In addition, a structure that does not interfere with peripheral components is obtained.

A scroll compressor according to the present invention comprises a shell having an oil sump at the bottom, a fixed scroll provided on the upper portion of the shell and having spiral teeth formed on a base plate, and a compression mechanism together with the fixed scroll. An oscillating scroll in which spiral teeth are formed on a plate and a boss portion having a oscillating bearing is formed at the center of the back surface, and an eccentric shaft portion rotatably engaged with the oscillating bearing is formed at one end. The main shaft is rotationally driven by the cylinder, has a bottomed cylindrical shape, the outer periphery is fixed to the inner peripheral surface of the shell, the fixed scroll is abutted and fixed to the upper end surface of the open side across the swing scroll, and the main shaft is In a scroll compressor comprising a frame formed with a main bearing that is rotatably supported, and an Oldham ring disposed between the swing scroll and the bottom of the frame, and preventing rotation of the swing scroll,
Between the swing scroll and the bottom of the frame, a substantially ring-shaped thrust receiver for supporting the swing scroll in the thrust direction is disposed, and the thrust receiver is formed on the outer peripheral side of the back surface of the base plate of the swing scroll. It is accommodated in the recessed part made.

  The scroll compressor according to the present invention can be configured to be compact in the height direction by accommodating the thrust receiver in a substantially ring-shaped recess provided on the back surface of the base plate of the swing scroll. Further, since the weight of the orbiting scroll can be reduced, abnormal wear and seizure of the bearing can be prevented, and a lightweight scroll compressor can be obtained.

It is a principal part expanded sectional view of the scroll compressor in Embodiment 1 of this invention. It is the perspective view which expanded and showed the main member of the scroll compressor in Embodiment 1 of this invention. FIG. 3 is a plan view of the orbiting scroll and the thrust receiver in the first embodiment viewed from the back side. It is a principal part enlarged view of FIG. It is a principal part enlarged view of FIG. It is a principal part enlarged plan view of the scroll compressor in Embodiment 2 of this invention. It is a principal part enlarged plan view of the scroll compressor in Embodiment 3 of this invention. It is a longitudinal cross-sectional view of the conventional scroll compressor. It is a principal part expanded sectional view of the scroll compressor of FIG.

  Embodiments of a scroll compressor according to the present invention will be described below with reference to the drawings.

Embodiment 1 FIG.
1 is an enlarged cross-sectional view of a main part of a scroll compressor according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view showing the main members of the scroll compressor. FIG. 1 shows a cross section of a position not including the Soldam ring accommodating portion 104c. In the figure, the same parts as those of the conventional scroll compressor shown in FIGS. 8 and 9 are denoted by the same reference numerals, and redundant description is omitted.

The fixed scroll 101 constituting the compression mechanism has spiral teeth 101b formed on the lower surface of the base plate 101a. Similarly, the swing scroll 102 has spiral teeth 102d formed on the upper surface of the base plate 102c. As described above, the rocking scroll 102 performs a rocking motion with respect to the fixed scroll 101, whereby the refrigerant gas is compressed between the spiral teeth 101b and 102d.

  As shown in FIG. 1, in the present embodiment, a ring-shaped recess 102e is formed on the outer peripheral side of the back surface of the base plate 102c of the orbiting scroll 102, and a substantially ring-shaped thrust receiver 112 is accommodated in the recess 102e. is doing.

  Further, as shown in FIG. 2, a pair of screw holes 102f for placing the reamer bolt 114 is provided in the recess 102e, and a pair of holes 112a for housing the head of the reamer bolt 114 are provided at positions opposed to the thrust receiver 112. ing. By inserting the reamer bolt 114 into the hole 112a provided in the thrust receiver and the screw hole 102f provided in the back surface of the orbiting scroll 102, the position of the thrust receiver 112 is regulated and interference with surrounding members is avoided. be able to.

  Next, referring to FIGS. 3, 4, and 5, the thrust receiving housing recess 102 e provided on the back surface of the orbiting scroll 102, the screw hole 102 f provided in the recess 102 e, and the thrust receiver 112 are provided. The dimensional relationship of the hole 112a for accommodating the head of the reamed bolt 114 will be described.

  FIG. 3 is a view of the orbiting scroll 102 and the thrust receiver 112 as viewed from the back side, and FIGS. 4 and 5 are enlarged views of the main parts thereof. As shown in FIG. 3, a thrust receiver 112 is concentrically housed in a substantially ring-shaped recess 102e formed on the outer peripheral side of the back surface of the base plate 102c of the orbiting scroll. The pair of grooves 102g formed on the back surface of the base plate 102c of the orbiting scroll are grooves for receiving the claws 107b formed in the ring portion 107a of the Oldham ring 107.

  As shown in FIG. 4, in the recess 102e provided on the back surface of the base plate 102c of the orbiting scroll, the distance from the center of the base plate 102c to the outer peripheral end of the linear portion of the Oldham ring claw receiving groove 102g is φA. The distance from the center of the base plate 102c to the inner peripheral position of the recess 102e is φB. At this time, by arranging them in the relationship of φA <φB, it is possible to ensure the surface pressure between the claw 107b of the Oldham ring 107 and the Oldham ring claw receiving groove 102g during the compressor operation.

  Further, as shown in FIG. 5, the gap between the holes provided in the reamer bolt 114 and the thrust receiver 112 is defined as Cr1. A clearance between the inner periphery of the substantially ring-shaped recess 102e provided on the back surface of the base plate 102c of the swing scroll 102 and the inner periphery of the thrust receiver 112 is defined as Cr2. A clearance between the outer periphery of the thrust receiver 112 and the inner periphery of the frame 104 is Cr3. At this time, it is configured by the relationship of Cr1 <Cr2 and Cr1 <Cr3, and by restricting the position of the thrust receiver 112 by the reamer bolt 114, the thrust receiver 112 is compactly stored in the height direction and interferes with peripheral parts A structure without any can be obtained.

  Next, the operation of the scroll compressor according to this embodiment will be described. When a power supply terminal (not shown) provided in the shell 103 is energized, torque is generated between the electric motor 106 and the rotor 105c, and the main shaft 105 rotates (see FIG. 8). As a result, the orbiting scroll 102 rotatably mounted on the eccentric shaft portion 105 a of the main shaft 105 revolves through the Oldham ring 107 and cooperates with the fixed scroll 101.

  The refrigerant gas sucked into the shell 103 from the suction pipe is sucked into the compression chamber constituted by the fixed scroll 101 and the swing scroll 102, compressed, and then discharged out of the shell 103 through the discharge pipe.

  The lubricating oil in the oil sump 108 at the bottom of the shell 103 is pumped up by the pump 109 when the main shaft 105 rotates, passes through an oil hole 105 b provided in the main shaft 105, and reaches between the thrust receiver 112 and the bottom 104 a of the frame 104. After lubrication and lubrication to the sliding contact surface, and further to each bearing and other sliding parts, it returns to the bottom of the shell 103 again.

  As described above, a substantially ring-shaped recess 102e is provided on the back surface of the base plate 102c of the orbiting scroll 102, and the thrust receiver 112 is accommodated in the recess 102e, so that a scroll compressor having a compact structure in the height direction can be obtained. realizable. Further, by providing the recess 102e, the swing scroll 102 can be reduced in weight, and the centrifugal force can be suppressed.

  Further, by providing the inner peripheral position of the recess 102e provided on the back surface of the base plate 102c of the orbiting scroll 102 outside the linear portion of the claw 107b of the Oldham ring 107, the surface pressure of the claw can be ensured.

Further, the position of the thrust receiver 112 is restricted by the reamer bolt 114, the hole 112a provided in the thrust receiver 112, and the hole 102f provided in the back surface of the base plate 102c of the orbiting scroll 102, thereby interfering with peripheral components. A structure without any problems can be realized.
As a result, a highly reliable scroll compressor can be obtained.

  In addition, although the metal plate material excellent in abrasion resistance is normally used for the thrust receptacle 112, you may comprise the laminated plate material for the metal from which a characteristic differs. For example, a metal having excellent wear resistance is used on the sliding portion side, and a metal having excellent strength is used on the side in contact with the orbiting scroll 102.

Embodiment 2. FIG.
In the present embodiment, the shape of the thrust receiver will be described in the case where the claw 107b of the Oldham ring 107 is overhanging on the outer peripheral side from the ring portion 107a of the Oldham ring 107.

  FIG. 6 is a principal plan view showing the shape of the thrust receiver 112 in such a case. In the thrust receiver 112 described in the first embodiment, the relief portion 112b is provided on the outer peripheral side from the straight portion of the claw accommodation groove 102g so as to correspond to the relief portion 102h provided at the tip of the claw accommodation groove 102g of the Oldham ring. Thus, interference with the Oldham ring 107 can be avoided.

Embodiment 3 FIG.
In the present embodiment, the structure of the thrust receiver 112 will be described in the case where an oil supply hole for supplying lubricating oil is provided in the sliding portion of the thrust receiver 112.

  FIG. 7 is a principal plan view showing the shape of the thrust receiver 112 in such a case. The thrust receiver 112 described in the second embodiment is provided with an oil supply hole 112c on the outer peripheral side of the relief portion 112b of the claw 107b of the Oldham ring 107, thereby sufficiently supplying lubricating oil to the sliding portion of the thrust receiver 112. Abnormal wear and seizure due to load can be prevented.

101 fixed scroll 101a, 102c base plate 101b, 102d spiral tooth 102 swing scroll 102a boss part 102b bearing hole part 102e concave part 102f hole 102g Oldham ring claw receiving groove 103 shell 104 frame 104a bottom 104b old bearing ring receiving part 104d Oil hole 105 Main shaft 105a Eccentric shaft portion 105b Oil hole 105c Rotor 106 Electric motor 107 Oldham ring 107a Claw 107b Ring portion 108 Oil sump 109 Pump 110 Inner space 111 Outer space 112 Thrust receiver 112a Hole 112b Relief bolt 112c Oil supply hole 114c

Claims (6)

A shell having a sump at the bottom;
A fixed scroll provided in the upper part of the shell and having spiral teeth formed on the base plate;
A rocking scroll that forms a compression mechanism together with the fixed scroll, has spiral teeth formed on the base plate, and has a boss portion having a rocking bearing in the center of the back surface;
An eccentric shaft portion that is rotatably engaged with the rocking bearing at one end, and a main shaft that is rotationally driven by an electric motor;
It has a bottomed cylindrical shape, the outer periphery is fixed to the inner peripheral surface of the shell, the fixed scroll is abutted and fixed to the upper end surface of the open side with the rocking scroll sandwiched, and the main shaft is rotatably supported at the bottom. A frame on which a main bearing is formed;
In a scroll compressor provided with the Oldham ring disposed between the swing scroll and the bottom of the frame and preventing rotation of the swing scroll,
A substantially ring-shaped thrust receiver that supports the rocking scroll in a thrust direction is disposed between the rocking scroll and the bottom of the frame, and the thrust receiver is a back surface of the base plate of the rocking scroll. A scroll compressor characterized by being housed in a recess formed on the outer peripheral side of the scroll compressor. A reamer bolt is inserted into a hole provided in the thrust receiver and a hole provided in a position facing the hole in the recess of the swing scroll, and the position of the thrust receiver is regulated by the reamer bolt. The scroll compressor according to claim 1. 3. The scroll compressor according to claim 1, wherein the thrust receiver is a plate material in which two kinds of substantially ring-shaped metals of different materials are bonded to each other. As the Oldham ring, a pair of claws orthogonal to each other is formed on the upper surface and the lower surface of the ring, and the claws are overhanging on the outer peripheral side from the ring of the Oldham ring, and the thrust receiver is used. 4. The escape part according to claim 1, wherein an escape part for releasing the claw is provided on a rear surface of the swing scroll and is formed on an outer peripheral side from a linear part of a groove for accommodating the claw. 5. The scroll compressor described. The scroll compressor according to claim 4, wherein the thrust receiver has an oil supply hole for supplying lubricating oil between the thrust receiver and the frame. The oil in the sump is pumped up by a pump, passes through an oil hole penetrating the inside of the main shaft in the axial direction, supplies the main bearing and the rocking bearing of the frame, and then comes into sliding contact with the frame of the thrust receiver. The scroll compressor according to any one of claims 1 to 5, wherein the oil is discharged from an oil discharge hole in the frame to the oil sump.

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