JP2000220582A - Scroll fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a scroll fluid machine supporting swing scroll by a thrust plate. SOLUTION: This scroll fluid machine is provided with Oldham's coupling for rolling a swing scroll 7 on a circular track without being rotated against a fixed scroll 6. In this case, a housing 5 is provided with a thrust plate for supporting the thrust surface of a mirror plate 11 of the swing scroll 7. The thrust plate is made of a material prepared by blending at least one or more of graphite and carbon with solid lubricating material, and impregnating it with at least one of a non-iron metal and resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll fluid machine including a scroll compression element and an electric element for driving the scroll compression element.

[0002]

2. Description of the Related Art A conventional scroll fluid machine, particularly a compressor, has a scroll compression element and an electric element as shown in Japanese Utility Model Application Laid-Open No. 5-50094, for example. A fixed scroll having a housing having a main bearing, a head plate fixed to the housing, and a spiral wrap erected on the head plate; a spiral plate erected on one surface of the head plate and one end surface of the head plate The fixed scroll and the oscillating scroll are assembled by engaging the wrap with each other, and the boss of the oscillating scroll is electrically driven. The drive device provided on the rotation shaft of the element is configured to be fitted.

Further, a thrust plate for supporting a thrust load applied to the orbiting scroll is provided between the housing and the end plate of the orbiting scroll to prevent seizure of the housing.

[0004]

However, since such a conventional scroll fluid machine uses a thrust plate mainly composed of resin, there is a problem in sliding resistance and improvement in durability has been desired.

The present invention has been made to solve the above-mentioned conventional technical problem, and has as its object to improve the durability of a scroll fluid machine that supports an orbiting scroll with a thrust plate.

[0006]

That is, a scroll fluid machine according to the present invention has a head plate, a spiral wrap erected on the head plate, a fixed scroll fixed to a housing, a head plate and the head plate. A scroll compression element composed of an orbiting scroll having a fixed scroll wrap and a spiral wrap meshing with each other, an electric element having a rotating shaft for driving the orbit scroll, and an orbiting scroll An Oldham coupling for revolving on a circular orbit without rotating with respect to the fixed scroll, comprising a thrust plate provided on the housing and supporting a thrust surface of a head plate of the orbiting scroll, This thrust plate is made by mixing a solid lubricant with at least one material of graphite or carbon, and a non-ferrous metal and resin. Are those composed of impregnated material at least one or more inner.

Further, in the scroll fluid machine according to the present invention, in addition to the above, an engaging hole is formed in the thrust plate, and a pin portion which engages with the engaging hole is formed in the housing to protrude. The movement in the direction is prevented.

The scroll fluid machine according to a third aspect of the present invention, in addition to the first or the second aspect, has a recess formed on the surface of the thrust plate on the swing scroll side.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of an oilless scroll type air compressor 1 as an embodiment of the scroll fluid machine of the present invention, and FIG. 2 is an exploded perspective view of a housing 5, an orbiting scroll 7, a thrust plate 41, and the like.

The scroll-type air compressor 1 of the embodiment includes an upper scroll compression element 2 and a lower electric element 3. The scroll compression element 2 has a main bearing 4 in the center.
, A fixed scroll 6 fixed to the upper surface of the housing 5 with bolts 51, and an oscillating scroll 7 sandwiched between the fixed scroll 6 and the housing 5.

The fixed scroll 6 has a disk-shaped end plate 8, an annular wall 9 protruding from one peripheral edge of the end plate 8, and a spiral-shaped spiral wall surrounded by the annular wall 9 and erected on the end plate 8. And a wrap 10. And fixed scroll 6
Makes the projecting direction of the annular wall 9 and the wrap 10 downward.

The orbiting scroll 7 has a disk-shaped end plate 11,
The end plate 11 includes a spiral wrap 12 erected on one surface of the end plate 11 and a boss 13 protruding from the center of the other surface of the end plate 11. The orbiting scroll 7 has the wrap 12 projecting upward.

The fixed scroll 6 and the orbiting scroll 7 are engaged with each other with the wraps 10 and 12 facing each other to form a plurality of compression spaces 14 therein. The case 1 is attached to the lower surface of the housing 5 with bolts 26.
5 is attached, and the electric element 3 is
Is stored inside. The case 15 communicates with the outside through a window. The electric element 3 includes a stator 16 fixed in a case 15, a rotor 17 disposed inside the stator 16, and a rotating shaft 18 inserted in the center of the rotor 17. ing.

A rotating shaft 1 is provided at the center of the lower surface of the case 15.
An auxiliary bearing 19 that supports the lower end of 8 via a ball bearing 54 is provided. The main bearing 4 is provided with a ball bearing 24 fitted to the step portion 20 of the rotating shaft 18.

Reference numeral 25 denotes a driving device for transmitting the rotational force of the electric element 3 to the orbiting scroll 7. The driving device 25 is inserted into the boss hole of the boss portion 13 of the orbiting scroll 7 to revolve the orbiting scroll 7. Bush 28 to be made and bush 28
30 for fixing the shaft to the eccentric portion 29 at the upper end of the rotating shaft 18
It is composed of

A suction port (not shown) communicating with the compression space 14 outside the end plate 8 is formed in the fixed scroll 6, and a discharge port 32 communicating with the compression space 14 is formed at the center of the end plate 8.
Are formed respectively. An Oldham coupling 36 revolves around a circular orbit so that the orbiting scroll 7 does not rotate with respect to the fixed scroll 6.

The Oldham coupling 36 includes a frame 37 formed of a ring of hard synthetic resin such as PPS (polyphenylene sulfide) and a plurality of claws 39, 39, 39A,
9A. The frame 37 has a predetermined width,
One surface (upper surface) comes into contact with the orbiting scroll 7 and the other surface (lower surface) comes into contact with the housing 5 and slides. The pair of claw portions 39, 39 are provided at opposing positions on one surface (lower surface) of the frame 37, and the pair of claw portions 39A, 39A oppose at a position shifted by 90 degrees on the other surface (upper surface) side. Are formed.

A groove 11A is formed on the back surface of the end plate 11 of the orbiting scroll 7, and a groove 58 is also formed on the upper surface of the housing 5. Then, a pair of claw portions 39, 39 formed on the lower surface of the Oldham coupling 36 at opposing positions.
Are slidably engaged with the groove 58, and the other pair of claw portions 39A, 39A formed on the upper surface at a position shifted by 90 degrees.
A slidably engages the groove 11A of the orbiting scroll 7 so that the orbiting scroll 7 revolves.

A thrust plate 41 having a predetermined thickness and having a pair of engagement holes 41A is provided between the housing 5 and the orbiting scroll 7 (FIGS. 3 and 4). The thrust plate 41 is provided on the surface (upper surface) of the housing 5 on the side of the orbiting scroll 7 and supports the thrust surface of the end plate 11 of the orbiting scroll 7 to reduce the sliding resistance between the orbiting scroll 7 and the housing 5. It is to reduce.

The thrust plate 41 is obtained by mixing a solid lubricant with at least one material of graphite (graphite) or carbon and impregnating at least one of non-ferrous metals and resin. It is composed of materials.

The solid lubricant is, for example, ethylene tetrafluoride or molybdenum disulfide, and these are inserted or dispersed and blended. The non-ferrous metals are copper, lead, tin, antimony and the like, and at least one or more of these and resins are selected and impregnated.

Specifically, in this embodiment, a mixture of graphite and carbon mixed with a solid lubricant and impregnated with a resin is used.

On the other hand, on the surface of the housing 5 on the side of the orbiting scroll 7, a pair of pin portions 21 project from a portion located inside the Oldham coupling 36 at a position shifted from the groove 58 by 90 degrees. Then, engagement holes 41A, 41A formed in the thrust plate 41 are engaged with these pin portions 21, 21, respectively. Thereby, the thrust plate 41 is positioned on the housing 5 in a state where the movement in the horizontal direction is prevented.

When the electric element 3 is rotated in the scroll-type air compressor 1 configured as described above, the rotational force is transmitted to the orbiting scroll 7 via the rotating shaft 18. That is, the orbiting scroll 7 is driven by the bush 28 of the driving device 25 attached to the rotating shaft 18 inserted into the boss hole of the boss portion 13 of the scroll, and the Oldham coupling 36
As a result, the fixed scroll 6 revolves on a circular orbit so as not to rotate.

The fixed scroll 6 and the orbiting scroll 7 are formed in a compression space 14 formed by these scrolls.
Is gradually reduced from the outside to the inside to compress the air flowing from the suction port. The compressed air is discharged from the discharge port 32 of the end plate 8 of the fixed scroll 6.

At this time, the thrust surface of the end plate 11 of the orbiting scroll 7 is made by mixing a solid lubricant with at least one material of graphite or carbon and impregnating at least one of non-ferrous metals and resin. Since it is supported by the thrust plate 41 formed of the material that has been made, the sliding resistance accompanying the swinging motion of the orbiting scroll 7 and the durability due to sliding friction are improved, and the service life can be significantly extended. .

If a hole is formed in the housing 5 for communicating the electric element 3 with the thrust plate 41, and a through hole is formed in the thrust plate 41 instead of a concave portion, the wind generated by the rotation of the electric element 3 can be generated. It reaches the thrust plate 41 through the hole of the housing 5, cools it, and reaches the orbiting scroll 7 side through the thrust plate 41.
This has the effect of blowing away wear powder generated between the orbiting scroll 7 and the thrust plate 41.

FIG. 5 shows another embodiment of the thrust plate 41. In this case, the thrust plate 4
A recess 42 having a predetermined shape is formed on the surface of the orbiting scroll 7. Abrasion powder generated by sliding friction between the orbiting scroll 7 and the thrust plate 41 enters the recess 42 and is evacuated in the recess 42.

The recess 42 is formed at a substantially center in the width direction along the circumference of the thrust plate 41. The concave portion 42 is formed in an arc shape with a predetermined interval from both the engagement holes 41A, 41A, and is configured to store lubricating oil and wear powder therein.

As described above, since the predetermined concave portion 42 is formed on the surface of the thrust plate 41 on the side of the orbiting scroll 7, wear powder generated by sliding friction between the orbiting scroll 7 and the thrust plate 41 is removed from the concave portion 42. The swinging operation of the orbiting scroll 7 can be performed extremely smoothly.

FIG. 6 shows a thrust plate 41 of another embodiment. In this case, the recess 42 is formed in a substantially central portion in the width direction of the thrust plate 41 and communicates with the engagement holes 41A, 41A so that lubricating oil and wear powder can be stored therein.

FIG. 7 shows a thrust plate 41 of still another embodiment. In this case, two rows of recesses 42 formed in the thrust plate 41 of FIG. 5 are provided in the width direction, and in FIG. 8, two rows of recesses 42 formed in the thrust plate 41 of FIG. 6 are provided in the width direction. .

FIG. 9 shows still another embodiment of the thrust plate 41. In this case, the concave portions 42 are formed to extend radially from the center of the thrust plate 41 in the radial direction, and a plurality of concave portions 42 are provided at predetermined intervals in the circumferential direction. FIG. 10 shows a thrust plate 4 of FIG. 9 in a recess 42 formed in the thrust plate 41 of FIG.
This is a combination of the concave portions 42 formed in FIG.

FIG. 11 shows a thrust plate 41 of still another embodiment. In this case, the concave portions 42 are formed in a circular shape, and a plurality of the concave portions 42 are provided at predetermined intervals in the circumferential direction of the thrust plate 41. FIG. 12 is a diagram in which a concave portion 42 formed in the thrust plate 41 of FIG. 11 is combined with a concave portion 42 formed in the thrust plate 41 of FIG.

Next, FIGS. 13 and 14 show a scroll type air compressor 1 according to another embodiment of the scroll fluid machine of the present invention. Also in this case, the scroll air compressor 1
Is composed of an upper scroll compression element 2 and a lower electric element 3 as described above. The scroll compression element 2 includes a housing 5 having a main bearing 4 at the center, a fixed scroll 6 fixed to an upper surface of the housing 5 by bolts 51, and an orbiting scroll mounted between the fixed scroll 6 and the housing 5. 7.

An Oldham coupling 36 is interposed between the fixed scroll 6 and the orbiting scroll 7. In this case, the Oldham coupling 36 is located in the recess 9B formed on the swinging scroll 7 side of the fixed scroll 6. Further, the groove 11A of the orbiting scroll 7 is provided on the fixed scroll 6 side, and the claw portion 39 provided on the Oldham coupling 36,
39 is slidably engaged, and a groove 9A is provided on the orbiting scroll 7 side of the fixed scroll 6 at a position shifted by 90 degrees from the groove 11A so as to be continuous with the recess 9B. The orbiting scroll 7 revolves when the claw portions 39A, 39A provided on the 36 are slidably engaged.

A thrust plate 41 is interposed between the thrust surface (lower surface) of the end plate 11 of the orbiting scroll 7 and the housing 5, and the fixed scroll 6 has bolts 43, 4
3 attaches to the housing 5.

In this case, the thrust plate 41 provided between the thrust surface of the orbiting scroll 7 and the housing 5 does not interfere with the Oldham's joint. The thrust plate 41 is also formed of a material obtained by mixing a solid lubricant with at least one material of graphite or carbon and impregnating at least one of non-ferrous metals and resins as described above. Therefore, the sliding resistance associated with the swinging operation of the orbiting scroll 7 and the durability due to the sliding friction are improved, and the service life is significantly extended.

[0039]

As described above in detail, according to the present invention, a fixed scroll fixed to the housing, a fixed scroll fixed to a housing, a head plate and a head plate mounted on the head plate are provided. A scroll compression element comprising a fixed scroll wrap and an orbiting scroll having a spiral wrap meshing with each other, an electric element having a rotating shaft for driving the orbiting scroll, and a fixed scroll for the orbiting scroll. In a scroll fluid machine having an Oldham coupling for revolving on a circular orbit without rotating, a thrust plate for supporting a thrust surface of an end plate of an orbiting scroll is provided in a housing, and the thrust plate is made of graphite. Or, a solid lubricant is blended with at least one material of carbon, and at least one of non-ferrous metals and resin. Having formed by material impregnated with one or more kinds, a sliding resistance due to the swinging operation of the swing scroll,
In addition, the durability due to sliding friction can be improved, and the service life can be significantly extended.

According to the second aspect of the present invention, in addition to the above, an engagement hole is formed in the thrust plate, and a pin portion for engaging with the engagement hole is formed in the housing so as to project in the horizontal direction of the thrust plate. Since the movement is prevented, the movement of the thrust plate in the horizontal direction due to the swinging motion of the swinging scroll can be reliably prevented while maintaining the dimensional accuracy in the thrust direction high.

Also, the difference in the linear expansion coefficient between the thrust plate and the housing can be absorbed by the clearance between the engagement hole and the pin portion, so that damage to the thrust plate due to a rise in temperature during operation is prevented. You can do it.

According to the third aspect of the present invention, in addition to the above inventions, a recess is formed on the surface of the thrust plate on the orbiting scroll side, so that abrasion powder generated by sliding friction between the orbiting scroll and the thrust plate is reduced. It can be retracted in this recess.

As a result, it is possible to prevent the further promotion of wear due to the wear powder beforehand, and it is possible to further improve the durability.

[Brief description of the drawings]

FIG. 1 is a sectional view of a scroll-type air compressor as an embodiment of a scroll fluid machine according to the present invention.

FIG. 2 is a housing of the scroll-type air compressor of FIG. 1,
It is an exploded perspective view of an Oldham coupling, a thrust plate, and an orbiting scroll.

FIG. 3 is a perspective view of the thrust plate of FIG. 2;

FIG. 4 is a plan view of the thrust plate of FIG. 3;

FIG. 5 is a front view of a thrust plate of an embodiment having a concave portion.

FIG. 6 is a front view of a thrust plate of another embodiment provided with a concave portion.

FIG. 7 is a front view of a thrust plate of still another embodiment provided with a concave portion.

FIG. 8 is a front view of still another embodiment of a thrust plate provided with a concave portion.

FIG. 9 is a front view of a thrust plate of still another embodiment provided with a concave portion.

FIG. 10 is a front view of a thrust plate according to still another embodiment provided with a concave portion.

FIG. 11 is a front view of a thrust plate of still another embodiment provided with a concave portion.

FIG. 12 is a front view of a thrust plate of still another embodiment provided with a concave portion.

FIG. 13 is a sectional view of a scroll-type air compressor as another embodiment of the scroll fluid machine of the present invention.

FIG. 14 is an exploded perspective view of a fixed scroll, an Oldham coupling, and an orbiting scroll of the scroll air compressor of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scroll type air compressor (scroll fluid machine) 2 Scroll compression element 3 Electric element 4 Main bearing 5 Housing 6 Fixed scroll 7 Oscillating scroll 8, 11 End plate 10, 12 Lapping 15 Case 18 Rotary shaft 19 Auxiliary bearing 24, 54 Ball Bearing 28 Bush 36 Oldham coupling 37 Frame 39 Claw 39A Claw 41 Thrust plate 42 Recess

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroyuki Matsumori 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. (reference) 3H039 AA03 AA12 BB05 BB11 CC02 CC08 CC16 CC22 CC35 CC41

Claims (3)

[Claims] 1. A fixed scroll fixed to a housing and having a head plate and a spiral wrap provided upright on the head plate, and a spiral engaged with the wrap of the fixed scroll provided upright on the head plate and the head plate. A scroll compression element composed of an orbiting scroll having an annular wrap, an electric element having a rotating shaft for driving the orbiting scroll, and a circle without rotating the orbiting scroll with respect to the fixed scroll. A scroll fluid machine having an Oldham coupling for revolving on a track, comprising a thrust plate provided on the housing and supporting a thrust surface of a head plate of the orbiting scroll, wherein the thrust plate is made of graphite or carbon. A solid lubricant is blended with at least one or more of the materials, and at least one of the non-ferrous metals and the resin. Scroll fluid machine characterized in that it is constituted by material impregnated with more species. 2. An engaging hole is formed in the thrust plate, and a pin portion for engaging with the engaging hole is protruded from the housing to prevent the thrust plate from moving in the horizontal direction. The scroll fluid machine according to claim 1. 3. The scroll fluid machine according to claim 1, wherein a concave portion is formed on a surface of the thrust plate on the orbiting scroll side.