JP2008303819A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor capable of supporting a movable scroll from a back face without inclining by a plurality of thrust plates. <P>SOLUTION: This scroll compressor is provided by installing the thrust plates 25 on a plane 13a of a movable scroll receiving support surface 13 so as to be supported by the plane 13a with the reference plane 13a. With this constitution, since the plurality of thrust plates 25 are supported by the plane 13a of the movable scroll receiving support surface part 13 easily held with high accuracy, the movable scroll 4 does not incline. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a scroll compressor that enables a compression operation by combining a fixed scroll and a movable scroll.

Scroll compressors are used in automobile air conditioning systems, home air conditioners, refrigerators, and the like. Many of these scroll compressors use a compression unit in which a spiral wrap of a fixed scroll and a spiral wrap of a movable scroll are engaged with each other.
In the compression unit, when the movable scroll is turned, the volume of the crescent-shaped compression chamber formed between the spiral wrap of the fixed scroll and the spiral wrap of the movable scroll is gradually reduced. The behavior of the compression chamber at this time is used to compress the fluid to be compressed such as a refrigerant.

  By the way, during the compression operation, a load acts on the movable scroll in the axial direction, that is, the thrust direction, as a reaction force of compression. That is, the movable scroll is to be separated from the fixed scroll. Therefore, in order to suppress the behavior that impairs the compression performance, in the scroll compressor, a support surface portion for the movable scroll receiver is formed on the back side of the end wall that supports the wrap of the movable scroll, and the support surface portion for the movable scroll receiver A thrust receiving structure for receiving a thrust load is provided.

This thrust receiving structure is required to have a structure that takes into account the downsizing of the compressor.
Therefore, recently, in the thrust receiving structure, as shown in Japanese Patent Application Laid-Open No. 2005-291151, a thrust plate formed of small parts of a circular thin plate using an embedded structure in the support surface portion for the movable scroll receiver, A structure in which a plurality of movable scrolls are provided in the circumferential direction has been proposed. For this purpose, a plurality of concave portions are formed in the plane portion of the movable scroll receiving support surface portion facing the end wall of the movable scroll along the circumferential direction of the movable scroll. In each of these recesses, a structure is used in which a thrust plate is inserted and inserted so that the upper surface slightly protrudes from the opening of the recess. That is, the structure which receives the end wall of a movable scroll in each thrust plate supported by the bottom face of the recessed part is used. Since this structure uses a plurality of thin plate parts, the thrust receiving structure itself has the advantage of being small.
JP 2005-291115 A

In order to ensure compression performance, it is desirable for the movable scroll to turn while maintaining a parallel posture around the axis of the fixed scroll.
However, in the structure shown in Japanese Patent Application Laid-Open No. 2005-291151, the thrust plate is supported by the bottom surface of the recess, so that the influence of variations caused by the processing of the recess inevitably reaches the movable scroll.

  That is, the concave portion is formed in each portion of the movable scroll receiving support surface portion by machining. However, the machining tends to cause variations in the depth direction. In addition, since the thrust plate is a component that is arranged in a plurality along the circumferential direction of the movable scroll and supports the movable scroll from the back, the variation in the depth direction of the recess appears as an inclination in the movable scroll. In other words, the movable scroll is engaged with the fixed scroll in an inclined state by the thrust plate.

Such inclination of the movable scroll affects the compression stroke performed between the fixed scroll and the lap of the movable scroll, and tends to cause a decrease in compression performance.
SUMMARY OF THE INVENTION An object of the present invention is to provide a scroll compressor that can support a movable scroll from the back without tilting with a plurality of thrust plates.

In order to achieve the above object, the thrust plate is assembled on the plane of the support surface portion for the movable scroll receiver so that the thrust plate is supported on the same plane with respect to the plane. .
With this configuration, the plurality of thrust plates are not supported by the bottom surfaces of the recesses that tend to vary in the depth direction as in Japanese Patent Application Laid-Open No. 2005-291151, but the support surface portion for the movable scroll receiver that is easily maintained with high accuracy. Supported by a flat surface. Thereby, the movable scroll is supported from the back without being inclined by the thrust plate.

  In the invention according to claim 2, the thrust plate faces the plane of the movable scroll receiving support surface portion on the thrust plate facing the plane of the movable scroll receiving support surface portion so that the thrust plate can be assembled with a simpler structure. The thrust plate is supported by the movable scroll receiving support surface portion by providing the protruding protrusion portion, providing the hole portion in the plane of the movable scroll receiving support surface portion, and inserting the protrusion portion into the hole portion.

  According to a third aspect of the present invention, the thrust plate is provided with a pin member projecting toward the thrust plate facing the plane on the plane of the movable scroll receiving support surface portion, a hole is provided in the thrust plate, The thrust plate is supported by the plane of the movable scroll receiving support surface portion by being inserted into the hole.

According to the first aspect of the present invention, the thrust plate is supported by the plane of the scroll receiving support surface portion that can be maintained with high accuracy, so that the movable scroll is supported by the thrust plate from the back without generating unnecessary tilt. be able to.
As a result, a decrease in compression performance due to the tilt of the movable scroll can be suppressed, and the compression performance of the scroll compressor can be improved.

  According to the second and third aspects of the invention, the thrust plate can be assembled on the plane of the scroll receiving support surface portion with a simple structure without tilting.

Hereinafter, the present invention will be described based on a first embodiment shown in FIGS.
FIG. 1 shows a front cross section of a scroll compressor, for example, an electric scroll compressor for vehicle air conditioning, FIG. 2 shows a side cross section taken along line II-II in FIG. 1, and FIG. 3 shows III- in FIG. 4 shows a partial cross section along line III, and FIG. 4 shows a structure for assembling the thrust plate.
In FIG. 1, reference numeral 1 denotes a scroll compressor housing. The housing 1 is configured by connecting a cylindrical unit casing 1b in the same manner as a compression unit casing 1a having a bottomed cylindrical shape with a cylindrical intermediate casing 1c interposed therebetween.

  Among these, the compression unit 5 is installed inside the compression unit casing 1a. The compression unit 5 uses a structure in which a fixed scroll 3 provided on the bottom side of the casing 1a and a movable scroll 4 provided on the opening side are combined. Specifically, both the fixed scroll 3 and the movable scroll 4 have a structure in which, for example, a spiral end wrap 8 is provided on a circular end wall 7. Among these, in the center of the back surface of the end wall 7 of the movable scroll 4, there is a cylindrical boss portion 11 in which an eccentric bush 10 is rotatably housed. The wrap 8 of the fixed scroll 3 and the wrap 8 of the movable scroll 4 mesh with each other, and a crescent-shaped compression chamber 12 is formed between the wraps 8 whose volume changes in accordance with the turning operation of the movable scroll 4. .

  The intermediate casing 1 c is formed with a cylindrical projecting portion that projects so as to be close to the end wall 7 of the movable scroll 4, and the projecting portion is supported by a movable scroll receiving support surface portion 13 (hereinafter simply referred to as “moving scroll receiving surface”). It is referred to as a support surface portion 13). The front end surface of the support surface portion 13 is formed by an annular flat surface 13 a parallel to the end walls 7 of the fixed scroll 3 and the movable scroll 4. Of course, the flat surface 13a faces the back surface 7a of the end wall 7 (adjacent).

  Inside the electric unit casing 1b, an electric unit 17 is provided, which is located on the opening side and is a combination of the rotor 15 and the stator 16. An inverter unit 18 for controlling the electric unit is installed on the bottom side. Both ends of the shaft 15a of the rotor 15 are rotatably supported by bearings 19 and 20 provided in the electric unit casing 1b and the intermediate casing 1c. Of the shaft 15, an eccentric pin portion 21 is provided at an eccentric point from the shaft end of the shaft 10a supported by the intermediate casing 1c.

  The eccentric pin portion 21 is inserted into an eccentric hole at an eccentric point of the eccentric bush 10 of the movable scroll 4. As a result, when the rotation of the rotor 15 is transmitted to the movable scroll 4 through the eccentric bush 10, the movable scroll 4 orbits around the axis of the fixed scroll 3 and the crescent-shaped compression chamber 12. The volume is changed so that the fluid to be compressed, for example, the refrigerant is compressed. The movable scroll 4 does not rotate with four pin-type rotation suppression tools 22 provided between the end wall 7 of the movable scroll 4 and the support surface portion 13 as shown in FIGS. 1 and 2. Only a swivel movement can be performed.

On the other hand, as shown in FIGS. 1 and 2, a plurality of thrust plates 25 are dotted between the back surface 7 a of the end wall 7 of the movable scroll 4 and the annular flat surface 13 a along the circumferential direction of the movable scroll 4. It exists. Each of these thrust plates 25 is formed of a thin circular member (for example, a diameter of about 10 mm and a thickness of about 2 mm).
For the assembly of the thrust plate 25, a structure that supports the entire thrust plate 25 using the flat surface 13a of the support surface portion 13 as a reference surface, which is easy to ensure accuracy, is used. The structure has a protrusion on one of a lower surface 25a (one side surface facing the flat surface 13a) of the thrust plate 25 and a flat surface 13a (surface facing the lower surface 25a) of the support surface portion 13 as shown in FIGS. For example, a structure in which a short columnar protrusion 28 is formed and a hole, for example, a hole that accommodates the entire protruding protrusion 28, specifically, a fitting insertion hole 29, is used.

  More specifically, for example, as shown in FIGS. 3 and 4, a short cylindrical protrusion 28 is integrally projected at the center (substantially center) of the lower surface 25 a of each thrust plate 25. In addition, a cylindrical fitting insertion hole 29 formed with a bottomed hole is formed at each point on the flat surface 13a corresponding to the protrusion 28. Each of the insertion holes 29 has an inner diameter corresponding to the outer diameter of the protrusion 28 and a depth deeper than the protruding length of the protrusion 28. H in FIG. 3 indicates the depth dimension of the insertion hole 29. The protrusion 28 is slidably (rotatably) inserted into the insertion hole 29, and the entire protrusion 28 protruding from the lower surface 25 a is accommodated in the insertion hole 29. Thus, the thrust plate 25 is positioned at a predetermined point. At the same time, the lower surface 25a of the thrust plate 25 abuts on the flat surface 13a. Thereby, the thrust plate 25 is arrange | positioned so that it may overlap with the plane 13a. Thus, the entire thrust plate 25 is supported from below by the flat surface 13a of the support surface portion 13 and positioned at a predetermined position. That is, the thrust plate 25 is assembled on the plane 13a with the plane 13a as a reference.

The thrust plate 25 supported by the flat surface 13 a supports the end wall 7 of the movable scroll 4 from the back side to receive the thrust load acting on the movable scroll 4.
In such a scroll compressor, when the electric unit 17 is excited, the rotor 15 rotates and the rotation is transmitted from the shaft 15 a to the movable scroll 4 through the eccentric pin portion 21. As a result, the movable scroll 4 orbits around the axis of the fixed scroll 3 and compresses the fluid to be compressed, for example, the refrigerant, from the change in the volume of the compression chamber 12 between the wraps 8 and 8.

During this compression operation, the load in the thrust direction acting on the movable scroll 4 is received by a plurality of thrust plates 25 that support the end wall 7.
At this time, the thrust plate 25 overlaps the flat surface 13a. That is, the thrust plate 25 is positioned with respect to the plane 13a.
Therefore, even if a variation in the depth direction occurs in the insertion hole 29 due to the recess processing, the variation does not affect the thrust plate 25. That is, the thrust plate 25 is not tilted. This is because the flat surface 13a on which the thrust plate 25 is placed is a portion where high accuracy is easily secured.

  Therefore, the movable scroll 4 is supported appropriately from the thrust plate 25 at any point on the basis of the flat surface 13a. Therefore, the movable scroll 4 does not incline with respect to the fixed scroll 3, and always has a predetermined posture, that is, appropriate for compression. It can be held in a fixed posture. As a result, the movable scroll 4 can sufficiently exhibit the desired compression performance in cooperation with the fixed scroll 3.

In addition, the thrust plate 25 can be assembled simply by using the fitting structure in which the projection 28 and the fitting hole 29 are combined.
5 and 6 show a second embodiment of the present invention.
In the present embodiment, contrary to the first embodiment, a pin member 35 is projected as a protrusion on the flat surface 13 a of the support surface portion 13, and a hole is formed at the center (substantially the center) of the lower surface of the thrust plate 25. A through-hole 36 that penetrates in the thickness direction is formed, and the thrust plate 25 is placed on the flat surface 13a.

  Specifically, the pin member 35 protrudes toward the lower surface of the thrust plate 25, and the through hole 36 has an inner diameter dimension corresponding to the outer diameter of the pin member 35. As shown in FIGS. 5 and 6, the pin member 35 is slidably (rotatably) inserted into the through hole 36, and the entire pin member 36 protruding from the plane 13aa is accommodated in the through hole 36. Yes. Thereby, like the first embodiment, the thrust plate 25 is positioned at a predetermined point. At the same time, the entire thrust plate 25 is supported from the lower side based on the flat surface 13a of the support surface portion 13 as in the first embodiment.

Therefore, even in the structure opposite to the first embodiment in which the pin member 35 and the through hole 36 are combined, the occurrence of the tilt of the movable scroll 4 can be prevented with a simple structure as in the first embodiment. it can.
However, in FIG. 5 and FIG. 6, the same parts as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Note that the present invention is not limited to the first and second embodiments described above, and various modifications may be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the structure in which the protrusion and the through hole are formed on the lower surface of the thrust plate and the hole and the pin member are formed on the flat surface is described. In addition, a structure for positioning the thrust plate may be used.

1 is a front sectional view of a scroll compressor according to a first embodiment of the present invention. Sectional drawing which follows the II-II line | wire in FIG. Sectional drawing which follows the III-III line | wire in FIG. The disassembled perspective view which shows the assembly structure of a thrust plate. Sectional drawing which shows the assembly structure of the thrust plate from which the principal part of the 2nd Embodiment of this invention differs. Similarly disassembled perspective view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Fixed scroll 4 Movable scroll 5 Compression unit 7 End wall 8 Lap 13 Movable scroll support surface part 13a plane 25 Thrust plate 28 Projection part 29 Insertion hole (hole part)
35 Pin member 36 Through hole (hole)

Claims (3)

A compression unit having a movable scroll having a spiral wrap formed on the end wall and a fixed scroll, and allowing the scroll wraps to engage with each other to perform a compression operation according to the orbiting motion of the movable scroll. When,
A movable scroll receiving support surface portion provided on the back side of the end wall of the movable scroll and having a plane facing the back surface of the end wall;
Scattered along the circumferential direction of the movable scroll and disposed on the movable scroll receiving support surface, slidably supports the rear surface of the end wall of the movable scroll, and receives a load in the thrust direction from the movable scroll. A plurality of thrust plates;
The scroll compressor, wherein the thrust plate is assembled on the plane of the movable scroll receiving support surface portion so as to be supported on the same plane with respect to the plane.   Assembling the thrust plate to the movable scroll receiving support surface portion is provided with a protrusion protruding toward the plane of the movable scroll receiving support surface portion on the thrust plate facing the flat surface. 2. The scroll compressor according to claim 1, wherein a hole portion is provided on a plane, and the protrusion is fitted into the hole portion.   Assembling the thrust plate to the movable scroll receiving support surface portion is provided with a pin member projecting toward the thrust plate facing the flat surface on the plane of the movable scroll receiving support surface portion, and providing a hole in the thrust plate. The scroll compressor according to claim 1, wherein the pin member is configured to be inserted into the hole.

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