WO2013021545A1

WO2013021545A1 - Scroll member and scroll-type fluid machine

Info

Publication number: WO2013021545A1
Application number: PCT/JP2012/004408
Authority: WO
Inventors: 創佐藤; 隆英伊藤; 尚夫水野
Original assignee: 三菱重工業株式会社
Priority date: 2011-08-05
Filing date: 2012-07-06
Publication date: 2013-02-14
Also published as: JP2013036366A; EP2740938A4; EP2740938B1; JP5888897B2; EP2740938A1

Abstract

The purpose of the present invention is to provide a scroll member capable of avoiding the stress concentrated on the root of a step portion. An orbiting scroll (20) comprises: an end plate (21); a spiral lap (22) installed upright on one side surface of the end plate (21) and extending from the center side toward the outer circumferential end side; an end side step portion (62) provided on an end side of the lap (22) and being lower on the center side than on the outer circumferential end side: and a base end side step portion (70) provided on one side surface of the lap (22) and being higher on the center side than the outer circumferential end side. In the orbiting scroll (20), a thinning portion (66) is provided in a predetermined engagement area from an engagement starting position (65) of the lap (22) in one or both of the end side step portion (62) and the base end side step portion (70).

Description

Scroll member and scroll type fluid machine

The present invention relates to a scroll type fluid machine used as a compressor or an expander.

As a scroll compressor that can increase the compressor capacity without increasing the outer diameter of the scroll member, a step portion is provided on each of the distal end side and the proximal end side of the spiral wraps of the pair of fixed scrolls and the orbiting scroll. A compressor has been proposed for three-dimensional compression in the circumferential direction and the height direction of the spiral wrap by making the wrap height higher than the center wrap height on the outer peripheral end side of the spiral wrap than the stepped portion. (For example, Patent Document 1 and Patent Document 2). Since this compressor can be compressed not only in the circumferential direction of the spiral wrap but also in the height direction of the wrap, the displacement can be increased and the compressor capacity can be increased. This compressor, called a three-dimensional scroll compressor, can be made smaller and more compact and lighter than a compressor having the same capacity.

JP 2002-364560 A JP 2007-224775 A

The scroll compressor performs compression of the fluid in the compression chamber by gradually reducing the volume of the compression chamber formed between the laps by revolving orbiting the orbiting scroll with respect to the fixed scroll. In this process, the fixed scroll wrap (fixed wrap) and the orbiting scroll wrap (orbiting wrap) slide, and the fixed wrap receives a load from the orbiting wrap and the orbiting wrap receives the load from the fixed wrap. This load is called tooth surface load.
However, in the three-dimensional scroll compressor, as described above, the orbiting scroll 100 (or fixed scroll) is provided with a stepped portion. In particular, as shown in FIG. 8, in the stepped portion 103 provided on the distal end side of the lap 101, stress is concentrated on the root 105 of the stepped portion 103 when an excessive tooth surface load Ft is applied to the distal end side of the stepped portion 103. In addition, the orbiting scroll 100 may be damaged starting from the root 105.
The present invention has been made based on such a problem, and an object thereof is to provide a scroll member capable of avoiding stress concentration at the base of the stepped portion.
An object of this invention is to provide the scroll type fluid machine which can maintain high reliability over a long period of time by providing such a scroll member.

For this purpose, the scroll member of the present invention is provided on the end plate, a spiral wrap standing on one side surface of the end plate and extending from the center side toward the outer peripheral end side, and the tip end side of the wrap. A distal end side step portion whose center side is lower than the outer peripheral end side, and a proximal end step portion provided on the proximal end side of the wrap, the center side being higher than the outer peripheral end side. This scroll member can be three-dimensionally compressed in the circumferential direction and the height direction of the wrap.
The scroll member is characterized in that a thinning portion is provided in a predetermined meshing range from a lap meshing start position at one or both of the front end side stepped portion and the proximal end stepped portion.
In the scroll member of the present invention, by providing a thinned portion in a predetermined meshing range, it is possible to prevent the counterpart lap from coming into contact with its own lap in the meshing range. By doing so, it is possible to avoid stress concentration at the base of the stepped side portion.

The scroll member of the present invention can be applied to one or both of the orbiting scroll and the fixed scroll. When the scroll member according to the present invention is applied to the orbiting scroll, it is possible to avoid the fixed scroll lap that is engaged with the other side from contacting the lap of the orbiting scroll at the front end side step portion (base end side step portion).

Hereinafter, preferred embodiments of the present invention will be referred to, but the effects of adopting these embodiments will become apparent in the description of the embodiments.
In the scroll member of the present invention, when the thinning portion is provided in the tip side step portion, the thinning portion can be provided in the entire region in the height direction from the tip of the wrap to one side surface of the end plate. The thinned portion can be provided in a specific region from the tip of the wrap to a predetermined position in the height direction.
Moreover, in this invention, a thinning part can be provided also in the front of the circumferential direction rather than a meshing start position.
In the present invention, the thickness reduction part can reduce height as it leaves in the peripheral direction from a meshing start position.
Further, in the present invention, the amount of thinning can be reduced as the distance from the meshing start position increases in the circumferential direction, or can decrease as the distance from the tip end of the wrap increases in the height direction.

The scroll member of the present invention described above can be applied to a scroll type fluid machine. In other words, this scroll type fluid machine is fixed to the housing side, a main shaft rotatably supported in a housing forming an outer shell, a turning scroll rotatably connected to a position offset with respect to the center of the main shaft. A fixed scroll that forms a compression space for compressing fluid between the orbiting scroll and the orbiting scroll, and one or both of the orbiting scroll and the fixed scroll are made of the scroll member described above. .
The fluid machine of the present invention is implemented as a compressor or an expander, and all are common in that they include the above-described housing, main shaft, orbiting scroll, and fixed scroll.

Scroll scroll type fluid machine may be composed of different materials for orbiting scroll and fixed scroll. As a typical example, a lightweight aluminum alloy is used for the orbiting scroll on the moving side, and an iron alloy having high mechanical strength is used for the fixed scroll. In this case, it is preferable to provide a thinned portion on a fixed scroll made of a material having high mechanical strength. Since the thinned portion reduces the mechanical strength of the wrap, the thinned portion is provided in the fixed scroll without providing the thinned portion in the orbiting scroll made of an aluminum alloy having low mechanical strength. Here, for ease of understanding, an example is shown in which an aluminum alloy is used for the orbiting scroll and an iron alloy is used for the fixed scroll. However, this is merely an example, and the orbiting scroll made of a material having high mechanical strength is used. Or it is the main point here to provide a thinning part in a fixed scroll.

Since the scroll member of the present invention is provided with a thinned portion, it avoids the stress from concentrating on the base of the stepped portion on the tip side by avoiding the contact of the mating wrap in a predetermined meshing range. A scroll type fluid machine including this scroll member can maintain high reliability over a long period of time.

It is sectional drawing which shows schematic structure of the scroll compressor in this Embodiment. It is a figure which shows the meshing state of a fixed scroll and a turning scroll, Comprising: It is sectional drawing in the surface along a main axis | shaft. (A) is a fixed scroll, (b) is a perspective view of a turning scroll. It is the elements on larger scale of the turning scroll which provided the thinning part. It is the elements on larger scale of the turning scroll which shows the other form of a thinning part. It is the elements on larger scale of the turning scroll which shows the other form of a thinning part. It is the elements on larger scale of the turning scroll which shows the other form of a thinning part. It is a perspective view which shows the conventional turning scroll.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
As shown in FIG. 1, the vertical compressor 10 includes a main shaft 12, a turning scroll 20 that rotates together with the main shaft 12, and a fixed scroll 30 that is fixed to the housing 11. In the present embodiment, a case where the compressor 10 is used in an air-conditioning refrigeration cycle system will be described as an example.
In such a compressor 10, a refrigerant (fluid) is introduced into the housing 11 from the refrigerant introduction port P <b> 1 formed on the side surface of the housing 11, and a compression space formed between the orbiting scroll 20 and the fixed scroll 30. The refrigerant is compressed. The compressed refrigerant is discharged from a refrigerant discharge port P <b> 2 provided at the upper end of the housing 11.

As shown in FIGS. 1 to 3, the orbiting scroll 20 is integrally formed with a spiral wrap 22 having a predetermined height on one side surface of a disc-shaped end plate 21. The inner peripheral surface IS and the outer peripheral surface OS of the wrap 22 are formed along an involute curve. However, the thinned portion 66 described later does not follow the involute curve.
On the other hand, in the fixed scroll 30, a spiral wrap 32 is formed on one side surface of the end plate 31 that faces the orbiting scroll 20 and meshes with the lap 22 of the orbiting scroll 20. The inner peripheral surface IS and the outer peripheral surface OS of the wrap 32 are also formed along an involute curve. However, the thinned portion 66 is the same as the wrap 22.
The orbiting scroll 20 and the fixed scroll 30 are usually obtained by cutting after an iron alloy or aluminum alloy is cast to obtain a scroll intermediate, thereby obtaining a necessary final shape.

As shown in FIG. 2, in the wrap 22 of the orbiting scroll 20 and the lap 32 of the fixed scroll 30, the end portion 31 of the fixed scroll 30 and the tip portion facing the end plate 21 of the orbiting scroll 20 are improved in sealing performance. Chip seals 28 and 38 made of a resin material or the like are provided (not shown in FIGS. 1 and 3).

In this way, the orbiting scroll 20 and the fixed scroll 30 combine the wrap 22 and the wrap 32 in the housing 11. Thereby, a compression space 50 is formed between the orbiting scroll 20 and the fixed scroll 30.

The refrigerant introduced into the compression space 50 from the outer peripheral end OT of the orbiting scroll 20 and the fixed scroll 30 is sequentially sent from the outer peripheral end OT to the center ST and compressed by the revolution of the orbiting scroll 20 relative to the fixed scroll 30. The refrigerant compressed in the compression space 50 is discharged from a refrigerant discharge port P <b> 2 formed at the upper end of the housing 11 through a reed valve 40 attached to an upper cover 39 provided so as to cover the fixed scroll 30.

Both ends of the main shaft 12 are rotatably supported by the housing 11 via

bearings

13 and 14. The main shaft 12 is rotationally driven by a motor 17 including a stator 15 fixed to the inner surface of the housing 11 and a rotor 16 fixed to the outer peripheral surface of the main shaft 12 and facing the stator 15. The main shaft 12 is configured to be rotationally driven by one end of the main shaft 12 projecting to the outside through the housing 11 and connected to one end of the main shaft 12 by a driving source (not shown) such as an engine or a motor provided outside. You can also.

On the other end portion of the main shaft 12, a boss 18 is formed so as to protrude from the central axis of the main shaft 12 by a predetermined amount. A recess 25 that accommodates the boss 18 is formed on the side of the main shaft 12 of the orbiting scroll 20. The boss 18 is inserted into the recess 25 via a drive bush (bearing) 24, whereby the orbiting scroll 20 is rotatably held by the boss 18. Thereby, the orbiting scroll 20 is provided eccentrically by a predetermined dimension with respect to the center of the main shaft 12, and when the main shaft 12 rotates around its axis, the orbiting scroll 20 is eccentric with respect to the center of the main shaft 12. Performs swivel motion (revolution) with the radius as the dimension. An Oldham ring (not shown) is interposed between the orbiting scroll 20 and the main shaft 12 so that the orbiting scroll 20 does not rotate while revolving.
The main shaft 12 has a lubricating oil passage 12a for supplying the lubricating oil sucked up from the oil reservoir at the bottom of the housing 11 from the upper end portion of the main shaft 12 to the drive bush 24 between the main shaft 12 and the recess 25 and the like. Is formed.

Now, in order to increase the compression rate by gradually reducing the cross-sectional area of the compression space 50 formed between the orbiting scroll 20 and the fixed scroll 30 from the outer peripheral end side toward the center side, In both of the fixed scrolls 30, the wrap height of the orbiting scroll 20 and the fixed scroll 30 is gradually reduced from the outer peripheral end side toward the center side. More specifically, it is as follows.
As shown in FIGS. 2 and 3, the end plate 21 on the orbiting scroll 20 side has a base end that is one side surface on which the wrap 22 is erected, and the center ST side is the outer peripheral end along the vortex direction of the wrap 22. A step portion 70 (proximal end step portion) formed to be higher than the OT side is provided. Similarly to the end plate 21 of the orbiting scroll 20, the end plate 31 of the fixed scroll 30 has a base end that is one side surface on which the wrap 32 is erected, and the center ST side is the outer peripheral end along the vortex direction of the wrap 32. A step portion 70 (proximal end step portion) formed to be higher than the OT side is provided.

The bottom surface (one side surface) of the end plate 21 is formed with a stepped portion 70, so that the bottom bottom surface 21A provided on the outer peripheral end OT side and the bottom bottom surface 21B provided on the center ST side are formed. It is divided into two parts. Further, the bottom surface of the end plate 31 is also formed with a stepped portion 70 in the same manner as the end plate 31 described above, so that a deep bottom surface 31A provided on the outer peripheral end OT side and a bottom provided on the center ST side are provided. It is divided into two parts with a shallow bottom surface 31B.
In the orbiting scroll 20 and the fixed scroll 30, spirally continuous grooves are formed by the

end plates

21 and 31 and the spiral wraps 22 and 32. Each of the

wraps

22 and 32 includes an inner peripheral surface IS and an outer peripheral surface OS, and is erected from the

end plates

21 and 31. The bottom surface of the spiral continuous groove is formed by the bottom surfaces 21A, 21B, 31A, 31B. The stepped portion 70 between the

bottom surface

21A, 31A on the outer peripheral end OT side and the

bottom surface

21B, 31B on the center ST side is formed in a semicircular shape with the interval between the

wraps

22, 32 on both sides of the groove as a diameter.

Further, the wrap 22 on the orbiting scroll 20 side corresponds to the stepped portion 70 of the fixed scroll 30, the spiral tip end side is divided into two portions, and the step ST on the vortex center ST side is lower than the outer peripheral end OT side. 62 (tip side stepped portion). That is, the wrap 22 is divided into a high wall portion 22H having a high height and a low wall portion 22L having a lower height than the high wall portion 22H with the stepped portion 62 as a boundary. In the stepped portion 62, a rising wall portion 63 that rises perpendicular to the top surface 22t of the low wall portion 22L is formed between the high wall portion 22H and the low wall portion 22L. It forms the end of the wall 22H.
The wrap 32 on the fixed scroll 30 side also corresponds to the stepped portion 70 of the orbiting scroll 20 similarly to the wrap 22, the spiral tip side is divided into two parts, and the vortex center ST side is from the outer peripheral end OT side. Is also a low step 62 (tip side step). That is, the wrap 32 is divided into a high wall portion 32H having a high height and a low wall portion 32L having a lower height than the high wall portion 32H with the stepped portion 62 as a boundary. In the stepped portion 62, a rising wall portion 63 that rises perpendicular to the top surface 32t of the low wall portion 32L is formed between the high wall portion 32H and the low wall portion 32L. It forms the end of the wall 32H.
When viewed from above, the rising wall portion 63 has a shape protruding from the

high wall portions

22H and 32H into a semicircular shape whose diameter is the thickness dimension of the

high wall portions

22H and 32H. The rising wall portion 63 continues to the

wraps

22 and 32 at the meshing start position 65. In the process of the orbiting scroll 20 revolving orbiting, the stepped portion 62 of the lap 22 starts to mesh with the lap 32 (outer peripheral surface) of the fixed scroll 30 from the meshing start position 65. Similarly, the stepped portion 62 of the lap 32 starts to mesh with the lap 22 (outer peripheral surface) of the orbiting scroll 20 from the meshing start position 65.

In the present embodiment, the thinning portion 66 is provided on one or both of the orbiting scroll 20 and the fixed scroll 30. A specific form of the thinning portion 66 will be described below by taking the orbiting scroll 20 as an example.
As shown in FIG. 4A, the orbiting scroll 20 includes a thinning portion 66 on the inner peripheral surface IS of the wrap 22. The thinning portion 66 is formed between the engagement start position 65 of the wrap 22 and a predetermined engagement position toward the outer peripheral end OT. The thinned portion 66 is retracted from the inner peripheral surface IS of the wrap 22 toward the outer peripheral surface OS, so that the thickness is reduced as compared with other portions of the wrap 22. The thinning portion 66 is provided to avoid contact between the wrap 22 and the wrap 32. Hereinafter, the engagement start position 65 may be referred to as the front end of the thinning portion 66, and the predetermined position on the outer peripheral end OT side may be referred to as the rear end of the thinning portion 66.
The lap 32 of the fixed scroll 30 starts to engage with the lap 22 from the engagement start position 65 in the process of the orbiting scroll 20 revolving orbiting. However, since the thinned portion 66 is provided in the wrap 22, the wrap 22 and the wrap 32 do not contact in the region where the thinned portion 66 is provided. Therefore, since the stress based on the tooth surface load received from the fixed scroll 30 does not act on the root 63a or is small even if it acts on the stepped portion 62 of the orbiting scroll 20, the wrap 22 is prevented from being damaged starting from the root 63a. be able to.
The thinned portion 66 can be easily formed by, for example, increasing the depth of cut compared to other portions in the process of processing the inner peripheral surface IS of the lap 22 with an end mill.

<Formation region of thinned portion 66 (circumferential direction)>
Next, the front end of the thinned portion 66 coincides with the engagement start position 65 of the wrap 22. This is because the wrap 22 and the wrap 32 theoretically start contact at the engagement start position 65. Therefore, theoretically, the front end of the thinned portion 66 may be aligned with the meshing start position 65. However, in actual design, there is a possibility that the lap 22 and the lap 32 may come into contact with the center ST side from the meshing start position 65 depending on the processing accuracy and assembly accuracy. In consideration of this, as shown in FIG. 4B, it is preferable to set the front end of the thinned portion 66 to the center ST side from the engagement start position 65, that is, to the front in the circumferential direction. In this case, if the thinning portion 66 extends to the rising wall portion 63 in addition to the thinning portion 66 extending to the low wall portion 22L beyond the engagement start position 65, the wrap 22 and the wrap 32 are formed. Can be more reliably avoided.
On the other hand, the stress applied to the root 63a can be reduced as the rear end of the thinned portion 66 moves away from the engagement start position 65 in the circumferential direction. However, even if the rear end of the thinned portion 66 is too far from the engagement start position 65, the effect of reducing the stress is saturated. According to the study by the present inventors, even if the turning angle exceeds 20 ° from the engagement start position 65 and the rear end of the thinned portion 66 is provided, the effect of reducing the stress is saturated. On the other hand, the amount of refrigerant that leaks increases as the rear end of the thinned portion 66 moves away from the engagement start position 65. Therefore, it is preferable that the rear end of the thinned portion 66 is set in a range where the turning angle is 20 ° from the engagement start position 65.

<Formation region of thinned portion 66 (wrap height direction)>
Next, in the example shown in FIGS. 4A and 4B, the thinned portion 66 is provided in the entire region in the height direction from the distal end of the wrap 22 to the base end (bottom surface 21B). It is not limited to.
For example, as shown in FIG. 5A, a region where the thickness is not reduced is left from the bottom surface 21B to a predetermined position in the height direction of the wrap 22. Thus, the following effects are exhibited by providing the thinned portion 66 in a specific region from the distal end of the high wall portion 22H of the wrap 22 to a predetermined position in the height direction toward the base end (bottom surface 21B).
Since the wrap 22 (high wall portion 22H) has a region where the thickness is not reduced below the thinned portion 66, the wrap 22 of the wrap 22 is compared with the example of FIG. 4 in which the thinned portion 66 is provided in the entire height direction. High strength. Moreover, since there is little area | region which provides the thickness reduction part 66, the leakage of a refrigerant | coolant can be suppressed. Further, when the wrap 32 reaches the engagement start position 65, the wrap 32 preferentially contacts the wrap 22 with an area where the wall thickness is not reduced, so that the wrap 32 is positioned. Therefore, in the region corresponding to the thinned portion 66, contact between the wrap 22 and the wrap 32 can be avoided more reliably. This effect is remarkable when the actual processing accuracy and assembly accuracy are taken into consideration.
On the other hand, although the wrap 32 is in contact with the wrap 22, it is close to the bottom surface 21 </ b> B of the wrap 22, so that the stress generated at the root 63 a is reduced, and an area where the thickness is not reduced below the thinned portion 66 is formed. Even if left behind, the influence of the stress on the root 63a is sufficiently small.

In addition, as shown in FIG.5 (b), this invention can also provide the thinning part 66 only above the upper end of the low wall part 22L of the lap | wrap 22. FIG. In this case, since the thinned portion 66 can be processed in the process of processing the inner peripheral surface IS of the lap 22, it contributes to a reduction in manufacturing cost as compared with FIG.

<Shape of thinning portion 66 (decrease in wrap height direction)>
Next, the thinned portion 66 described above has a constant height from the front end (meshing start position 65) to the rear end, but the present invention is not limited to this.
For example, as shown in FIG. 6, it is possible to reduce a region where the thinned portion 66 is provided from the front end side toward the rear end side. In this case, the lower edge of the thinned portion 66 may be linearly raised toward the rear end as shown in FIG. 6 (a), or the lower portion of the thinned portion 66 as shown in FIG. 6 (b). The edge may be raised stepwise. Even in this case, the thinned portion 66 is formed up to the upper end of the high wall portion 22H.
The thinning portion 66 shown in FIG. 6 can more easily prevent the refrigerant from leaking than the thinning shown in FIG.

<Thinning amount of the thinning portion 66 (total)>
The amount (thickening amount) by which the thinned portion 66 moves backward toward the outer peripheral surface OS is required to be an amount sufficient to avoid contact between the wrap 22 and the wrap 32. In consideration of processing accuracy, it is desired to secure a thinning amount of several tens of μm. Since the airtightness between the orbiting scroll 20 and the fixed scroll 30 is reduced and the leakage of the refrigerant is concerned if the thickness reduction is large, the thickness reduction is preferably 100 μm or less. However, since the amount of thinning is affected by specifications such as the dimensions and shape of the orbiting scroll 20 and the fixed scroll 30, optimum values should be set individually from the above-described ranges. As described above, the inner peripheral surface IS and the outer peripheral surface OS of the wrap 22 are formed along the involute curve, but the thinned portion 66 is not necessarily formed along the involute curve.

<Thinning amount of thinning portion 66 (circumferential direction, height direction)>
The thinning amount can be constant throughout the thinning portion 66, but may be varied.
As an example, FIG. 7A shows a form in which the thickness reduction is changed from the front end to the rear end. In this example, the thinning amount in the vicinity of the engagement start position 65 is maximized, and the thinning amount is gradually reduced toward the front end and the rear end.
Further, as shown in FIG. 7B, the amount of thinning can be varied in the height direction of the wrap 22. In this example, the amount of thinning is made constant above the low wall portion 22L, but the amount of thinning is gradually reduced downward below the low wall portion 22L.
By varying the amount of thinning as described above, it is easy to ensure the strength of the wrap 22 and it is possible to more effectively suppress the leakage of the refrigerant.

In the above embodiment, the example in which the thinned portion 66 is provided in the stepped portion 62 of the orbiting scroll 20 has been described. However, in the present invention, the thinned portion 66 can be provided in the stepped portion 62 of the fixed scroll 30, or the orbiting scroll. It is also possible to provide a thinning portion 66 on both 20 and the fixed scroll 30.
Moreover, although the above embodiment demonstrated the example which provides the thinning part 66 in the level | step-difference part 62 (tip side side step part) where the high wall part 22H and the low wall part 22L of the turning scroll 20 are connected by the rising wall part 63. The thinning portion 66 may be provided at the stepped portion 70 (base end side stepped portion) between the bottom surface 21A and the bottom surface 21B of the fixed scroll 30. Since the wrap 22 of the orbiting scroll 20 and the wrap 32 of the fixed scroll 30 are in contact with each other at the stepped portion 62 and the stepped portion 70, the thinned portion 66 is provided on one of the stepped portion 62 and the stepped portion 70, so Contact between 22 and wrap 32 can be avoided. Therefore, providing the thinned portion 66 at the stepped portion 62 of the fixed scroll 30 is equivalent to providing the thinned portion 66 at the stepped portion 70 of the orbiting scroll 20. That is, the present invention includes providing the thinned portion 66 in at least one region of the stepped portion 62 and the stepped portion 70 of the orbiting scroll 20, the stepped portion 62 of the fixed scroll 30, and the stepped portion 70.

The orbiting scroll 20 and the fixed scroll 30 can be made using an iron alloy or an aluminum alloy, but the orbiting scroll 20 may be made of an aluminum alloy having a small specific gravity and the fixed scroll 30 may be made of an iron alloy having a high strength. In this case, it is preferable to provide the thinned portion 66 on the fixed scroll 30 made of a strong iron alloy. Since the thinning portion 66 reduces the mechanical strength of the

wraps

22 and 32, the thinning portion 66 is provided in the fixed scroll 30 without providing the thinning portion 66 in the orbiting scroll 20 made of an aluminum alloy having low mechanical strength. It is.
In addition to this, as long as it does not depart from the gist of the present invention, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

DESCRIPTION OF SYMBOLS 10 Compressor 11 Housing 20 Orbiting scroll 30

Fixed scroll

21, 31

End plate

21A, 21B, 31A,

31B Bottom face

22, 32

Wrap

22H, 32H

High wall part

22L, 32L

Low wall part

22t, 32t Top surface 62 Step part (tip) Side step)
63 Standing wall portion 63a Root 65 Engagement start position 66 Thinning portion 70 Step portion (base end side step portion)
ST Center OT Outer peripheral edge

Claims

End plates,
A spiral wrap that is erected on one side surface of the end plate and extends from the center side toward the outer peripheral end side;
Provided on the tip side of the wrap, the tip side step portion whose center side is lower than the outer peripheral end side,
Provided on the base end side of the wrap, the base side is higher than the outer peripheral end side, and comprises a base end side step portion.
Providing a thinned portion in a predetermined engagement range from at least the engagement start position of the wrap in one or both of the distal end side step portion and the proximal end step portion;
A scroll member characterized by that.
The thinning portion is provided at the tip side step portion,
The entire region in the height direction reaching the one side surface from the tip of the wrap, or
Formed in a specific region from the tip of the wrap to a predetermined position in the height direction,
The scroll member according to claim 1.
The thinned portion is
It is also provided in the front in the circumferential direction from the engagement start position.
The scroll member according to claim 1 or 2.
The thinned portion is
The height decreases with increasing distance from the meshing start position in the circumferential direction.
The scroll member according to any one of claims 1 to 3.
The thinned portion is
The amount of thinning is
Decreasing with distance from the engagement start position in the circumferential direction, or
Decreases with increasing distance from the tip of the wrap,
The scroll member according to any one of claims 1 to 4.
A main shaft rotatably supported in a housing forming an outer shell;
A orbiting scroll rotatably connected to a position offset with respect to the center of the main shaft;
A fixed scroll fixed to the housing side, facing the orbiting scroll and forming a compression space for compressing fluid between the orbiting scroll, and
One or both of the orbiting scroll and the fixed scroll comprises the scroll member according to any one of claims 1 to 5.
A scroll type fluid machine characterized by the above.
The orbiting scroll and the fixed scroll are made of different materials,
The orbiting scroll or the fixed scroll made of the material having high mechanical strength is composed of the scroll member according to any one of claims 1 to 5.
The scroll type fluid machine according to claim 6.