JP2007198209A - Scroll type compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll type compressor capable of easily detecting coming off of a ball from a coupling plate, and improving assembly workability of a movable scroll and a center plate, and assemblability of whole device. <P>SOLUTION: In the scroll type compressor provided with a fixed scroll, the movable scroll meshing with the fixed scroll and revolving around the fixed scroll, a ball bearing revolving the movable scroll, and the center plate storing the ball bearing and having a gas passage formed thereon, diameter of the gas passage is formed larger than ball diameter of the ball bearing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a scroll compressor, and more particularly to a scroll compressor suitable for a hybrid compressor having two compression mechanisms.

  2. Description of the Related Art Conventionally, a scroll compressor including a fixed scroll and a movable scroll that is engaged with the fixed scroll and orbits with respect to the fixed scroll is known. Recently, a hybrid compressor having two compression mechanisms that can be driven separately or simultaneously by two different driving sources has been proposed (for example, Patent Document 1). Such a hybrid compressor is configured as shown in FIG. Note that FIG. 1 showing the basic configuration of the hybrid compressor is commonly used in the present invention. In FIG. 1, reference numeral 1 denotes a hybrid compressor. The hybrid compressor 1 includes a first compression mechanism 2 and a second compression mechanism 3. The first compression mechanism 2 includes a fixed scroll 6 including an end plate 4 and a spiral body 5 integrated with the end plate 4, an end plate 7 and a spiral body 8 integrated with the end plate 7. It has the movable scroll 9 which consists of. The spiral body 5 of the fixed scroll 6 and the spiral body 8 of the movable scroll 9 are engaged with each other. In FIG. 1, the fixed scroll 6 is formed integrally with the housing 1 a of the compressor 1.

  A crankshaft having a crank mechanism 11 is integrally formed at one end of the drive shaft 10. The crank pin 12 of the crank mechanism 11 is provided at a position eccentric from the axis of the drive shaft 10 and is inserted and fitted to the eccentric bush 13 with a certain play amount. The eccentric bush 13 is rotatably inserted into a drive bearing 14 inserted into the protrusion 9 a of the movable scroll 9. In the first compression mechanism 2, power from a first drive source (not shown) that drives only the first compression mechanism 2 is transmitted to the drive shaft 10 via a clutch mechanism 16 provided at the other end of the drive shaft 10. Then, the eccentric bush 13 into which the crank pin 12 is inserted and fitted rotates. Along with this, a turning motion is applied to the movable scroll 9 whose rotation is blocked by the ball coupling 33 as a rotation blocking mechanism. The power to the drive shaft 10 is transmitted or cut off when the clutch mechanism 16 is turned on or off. Examples of the first drive source include a vehicle prime mover, such as a vehicle drive engine and a motor.

  The fluid (for example, refrigerant) sucked into the compressor 1 from the suction chamber 17 along with the turning motion of the movable scroll 9 is taken into the spiral body from the outer ends of the spiral bodies 5 and 8. Then, as the fluid pocket formed by the spiral bodies 5 and 8 moves toward the center while reducing its volume, the fluid is compressed, and the discharge hole 18 drilled in the housing 1a and The first discharge passage 19 communicated is discharged into the discharge chamber 20.

  The second compression mechanism 3 includes a fixed scroll 23 including an end plate 21 and a spiral wound body 22 integrated with the end plate 21, an end plate 24, and a spiral wound body 25 integrated with the end plate 24. The movable scroll 26 which consists of these. The fixed scroll 23 is formed integrally with the housing 1 a of the compressor 1. That is, in the compressor 1 of FIG. 1, the fixed scroll 6 of the first compression mechanism 2 and the fixed scroll 23 of the second compression mechanism 3 are integrally formed back to back.

  A crankshaft having a crank mechanism 28 is integrally formed at one end of the drive shaft 27. The crank pin 29 of the crank mechanism 28 is provided at a position eccentric from the axis of the drive shaft 27, and is inserted and fitted to the eccentric bush 30 with a certain play amount. The eccentric bush 30 is rotatably inserted into a drive bearing 31 inserted into the protrusion 26 a of the movable scroll 26. The second compression mechanism 3 is driven by a built-in electric motor 32 as a second drive source that drives only the second compression mechanism 3. The built-in electric motor 32 has a rotor 34 and a stator 35 that are rotated integrally with the drive shaft 27.

  The protrusion 26 a of the movable scroll 26 is accommodated in the center plate 36. An annular coupling plate 37 is provided on the back surface 24 a of the end plate 24 of the movable scroll 26. On the other hand, a coupling plate 38 is also provided on the surface 36 a of the center plate 36. The coupling plates 37 and 38 are provided with a plurality of recesses 37a and 38a in the circumferential direction, and a ball 39 placed in the recesses 37a and 38a is sandwiched between the coupling plates 37 and 38. Yes. A ball bearing 40 is constituted by the coupling plates 37 and 38 and the ball 39. A drive shaft 27 is connected to the center plate 36.

  When the built-in electric motor 32 is driven and the drive shaft 37 is rotated, the eccentric bush 30 into which the crank pin 29 is inserted and fitted is rotated. Accordingly, a turning motion is applied to the movable scroll 26 whose rotation is blocked by the ball bearing 40 as a rotation blocking mechanism.

  The fluid sucked into the compressor 1 from the suction chamber 17 flows into the second compression mechanism 3 side through the communication path 41 provided in the housing 1a. And it is taken in inside a spiral body from the outer end of both spiral bodies 22 and 25 with the turning motion of a movable scroll. Then, as the fluid pocket formed by the spiral bodies 22 and 25 is moved toward the center while reducing its volume, the fluid is compressed, and the discharge hole 42 formed in the housing 1a and The second discharge passage 43 communicated with the discharge chamber 20 is discharged into the discharge chamber 20. Further, a gas passage 44 is provided in the center plate 36 in order to send the fluid flowing from the communication passage 41 to the second compression mechanism 3 side to the outer ends of the spiral bodies 22 and 25. A plurality of gas passages 44 are provided in the circumferential direction of the center plate 36.

  In the above configuration, in order to interpose the ball bearing 40 between the movable scroll 26 and the center plate 36, first, as shown in FIG. 4, the inside of each recess 38a of the coupling plate 38 on the center plate 36 side. The ball 39 is placed on the movable scroll 26 and the movable scroll 26 is inserted into the center plate 36 from the direction of the arrow. The ball bearing 40 is configured by sandwiching the ball 39 between the coupling plates 37 and 38.

However, in the configuration as described above, the center plate 36 has a hole 46 for accommodating the counterweight 45 as shown in FIG. For this reason, there is a possibility that the ball 40 may drop out from the respective recesses 38a of the coupling plate 38 and fall into the hole 46. Such a defect cannot be visually recognized from the outside, and thus is easily overlooked in the manufacturing process.
JP 2003-161257 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a scroll compressor that can easily detect a drop of a ball from a coupling plate, and can improve the workability of assembling the movable scroll and the center plate, and consequently the ease of assembly of the entire apparatus. is there.

  In order to solve the above-described problems, a scroll compressor according to the present invention includes a fixed scroll, a movable scroll that is engaged with the fixed scroll and that orbits with respect to the fixed scroll, and a ball bearing that orbits the movable scroll. In the scroll compressor including the ball bearing and the center plate in which the gas passage is formed, the diameter of the gas passage is formed larger than the ball diameter of the ball bearing. Become. In such a configuration, if the ball of the ball bearing falls off the coupling plate, the ball is discharged to the outside from the communication path provided in the center plate. Therefore, it is possible to reliably detect an assembly failure when the movable scroll is accommodated in the center plate.

  A plurality of the gas passages are preferably provided in the circumferential direction of the center plate.

  The scroll compressor according to the present invention can be applied to an electric compressor incorporating an electric motor, and can also be applied to a so-called hybrid compressor. For example, a scroll compressor includes a first compression mechanism that is driven only by a first drive source that is different from the built-in electric motor, and a second compression mechanism that is driven only by a built-in electric motor as a second drive source. The present invention can also be applied to a hybrid compressor that is installed side by side and assembled integrally.

  In such a hybrid compressor, for example, a configuration in which the fixed scrolls of the first compression mechanism and the second compression mechanism are arranged back to back can be employed. The fixed scrolls arranged back to back can be structured from a fixed scroll member formed integrally. Further, as the first drive source, a vehicle prime mover, for example, a vehicle engine, or an electric motor different from the built-in electric motor can be used.

  According to such a scroll compressor according to the present invention, since the diameter of the gas passage of the center plate is formed larger than the diameter of the ball of the ball bearing, when the ball falls off the coupling plate Since the balls are discharged to the outside through the gas passages of the center plate, it is possible to reliably detect an assembly failure.

Hereinafter, preferred embodiments of a scroll compressor of the present invention will be described with reference to the drawings.
FIG. 1 shows a scroll compressor according to an embodiment of the present invention, and the basic configuration is as described above. In this embodiment, the diameter of the gas passage 44 provided in the center plate 36 is formed larger than the diameter of the ball 39 constituting the ball bearing 40.

  Therefore, in order to interpose the ball bearing 40 between the movable scroll 26 and the center plate 36, the ball 39 is placed in each recess 38a of the coupling plate 38, and the movable scroll 26 is moved from the center plate 36 in the direction of the arrow. When the ball 39 is dropped and dropped into the hole 46 for some reason at that time, the ball 39 is surely discharged to the outside through the gas passage 44 (FIG. 3). Therefore, it is possible to reliably detect an assembly failure when the movable scroll 26 is accommodated in the center plate 36.

  The scroll compressor according to the present invention is widely applicable to scroll compressors, but is particularly suitable for a hybrid compressor having two compression mechanisms.

It is a longitudinal cross-sectional view of the scroll compressor which concerns on one embodiment of this invention (it uses also for description of a prior art). It is a top view of the center plate of the scroll compressor of FIG. It is sectional drawing which shows the assembly | attachment state of the fixed scroll and center plate of the 2nd compression mechanism of the scroll compressor of FIG. It is sectional drawing which shows the assembly | attachment state of the fixed scroll and center plate of the 2nd compression mechanism of the conventional scroll compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hybrid compressor 2 1st compression mechanism 3 2nd compression mechanism 4, 7, 21, 24 End plate 5, 8, 22, 25 Spiral wound body 6, 23 Fixed scroll 9, 26 Movable scroll 9a, 26a Protrusion 10, 27 Drive shaft 11, 28 Crank mechanism 12, 29 Crank pin 13, 30 Eccentric bush 14, 31 Drive bearing 16 Clutch mechanism 17 Suction chamber 18, 42 Discharge hole 19 First discharge passage 20 Discharge chamber 32 Built-in electric motor 33 Ball bearing 34 Rotation Child 35 Stator 36 Center plate 37, 38 Coupling plate 39 Ball 40 Ball bearing 41 Communication passage 43 Second discharge passage 44 Gas passage 45 Counterweight 46 Hole

Claims (5)

  A fixed scroll, a movable scroll that engages with the fixed scroll and orbits relative to the fixed scroll, a ball bearing that orbits the movable scroll, a center plate that houses the ball bearing and has a gas passage formed therein; A scroll compressor having a diameter of the gas passage larger than a ball diameter of a ball bearing.   The scroll compressor according to claim 1, wherein a plurality of the gas passages are provided in a circumferential direction of the center plate.   The scroll type compressor according to claim 1 or 2, wherein the scroll type compressor comprises a hybrid compressor having two compression mechanisms driven separately or simultaneously by different driving sources.   The scroll compressor according to claim 3, wherein the two compression mechanisms include a first compression mechanism driven by an external drive source and a second compression mechanism driven by a built-in electric motor. The scroll compressor according to claim 4, wherein the external drive source is a vehicle prime mover.

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