JP2004245059A - Scroll type compressor, and method of manufacturing scroll used for the compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll type compressor and a method of manufacturing a scroll used for the compressor capable of preventing or reducing the wear of a coating caused by interference with a spiral wall of the other scroll due to the thermal deformation of the scroll. <P>SOLUTION: This scroll type compressor is provided with a fixed scroll and a turning scroll respectively having spiral walls engaged with each other. The turning scroll is put in turning motion relative to the fixed scroll to compress a fluid taken into a compression chamber between both scrolls. The turning scroll 20 is provided with a scroll base material 23 having a spiral wall part 24 forming the main part of the spiral wall 22, and the coating 25 covering the spiral wall part 24. The coating 25 is formed with escape parts 27, 29 avoiding interference with the spiral wall 12 of the fixed scroll caused by the thermal deformation of the scroll. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a scroll compressor and a method of manufacturing a scroll used in the compressor.
[0002]
[Prior art]
The scroll compressor includes a fixed scroll and an orbiting scroll each having a spiral wall that meshes with each other. When the orbiting scroll orbits with respect to the fixed scroll, suction is performed into a compression chamber formed between the two scrolls. Is configured to compress the fluid.
As shown in FIG. 12, one of the scrolls of the scroll compressor, for example, the orbiting scroll, protrudes from a substantially disk-shaped substrate portion 121 and one side surface (upper surface in FIG. 12) of the substrate portion 121. And a spiral wall 122 having a substantially spiral shape. As the orbiting scroll 120, as shown in FIG. 13, there is a scroll base material 123 in which a spiral wall portion 124, which is a main body of a spiral wall 122, is covered with a coating 125 (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-63-105293 (FIG. 1)
[0004]
[Problems to be solved by the invention]
The orbiting scroll 120 may be thermally deformed, for example, as shown by a two-dot chain line 120 in FIG. At this time, the spiral wall 122 of the orbiting scroll 120 is deformed radially outward (see a two-dot chain line 122 in FIG. 12). Such deformation of the spiral wall 122 of the orbiting scroll 120 is large during high rotation and high temperature operation, and small during low rotation and low temperature operation. Therefore, the spiral wall 122 of the orbiting scroll 120 strongly interferes with the spiral wall 112 (see FIG. 13) of the fixed scroll at the time of high rotation and high temperature operation. Decrease.
[0005]
Conventionally, as shown in FIG. 13, the coating 125 is formed with a uniform thickness 125 t on the inner peripheral side and the outer peripheral side with respect to the spiral wall portion 124 of the scroll base material 123. In addition, the wall thickness 124t of the spiral wall portion 124 is constant from the tip to the root. Therefore, the wall thickness 122t of the spiral wall 122 having the coating 125 is constant from the tip to the root. For this reason, at the time of high rotation and high temperature operation, for example, the edge 125a of the coating 125 is strongly worn by the edge 125a of the coating 125 strongly interfering with the spiral wall 112 of the fixed scroll. Become. Therefore, there is a problem that the wear amount of the coating 125 is large. In FIG. 13, a worn portion is indicated by a stitch line A.
In addition, when the wear powder of the coating 125 flows downstream together with the fluid, the performance of a downstream device (for example, a fuel cell) may be reduced by the wear powder.
[0006]
An object of the present invention is to provide a scroll compressor capable of preventing or reducing abrasion of a coating due to interference with a scroll wall of another scroll due to thermal deformation of the scroll, and manufacturing of a scroll used in the compressor. It is to provide a method.
[0007]
[Means for Solving the Problems]
The above object can be solved by a scroll compressor having a configuration described in the claims of the present invention and a method of manufacturing a scroll used in the compressor.
That is, according to the scroll-type compressor described in claim 1, a relief portion is formed in the coating covering the spiral wall portion of the scroll base material in at least one of the fixed scroll and the orbiting scroll. I have. Therefore, interference between the spiral scroll wall and the coating due to thermal deformation of the scroll can be avoided, and wear of the coating due to the interference can be prevented or reduced. Incidentally, the relief of the coating can be formed by providing a recess in at least one of the coating itself and the spiral wall of the scroll base material. In addition, in the case where the recess serving as the escape portion is formed in the coating itself, the escape portion can be easily formed as compared with the case where the recess serving as the escape portion is formed in the spiral wall portion of the scroll base material. Further, the peripheral surface on which the relief portion of the coating is formed may be subjected to finishing by mechanical processing such as grinding, polishing, or the like, depending on the degree of interference with the scroll wall of the other scroll based on test data, for example. desirable. In addition, the term “thermal deformation of the scroll” as used in this specification refers to the thermal deformation of at least one of the fixed scroll and the orbiting scroll.
[0008]
Further, according to the scroll-type compressor described in claim 2 of the present invention, it is possible to form the escape portion of the coating by changing the wall thickness of the spiral wall having the coating from the tip side to the root side. it can. That is, the wall thickness of the spiral wall having the coating is the sum of the coating thickness and the wall thickness of the spiral wall portion of the scroll base material. Therefore, by changing at least one of the film thickness of the coating and the wall thickness of the spiral wall portion of the scroll base material from the tip side to the base side, a relief portion of the coating can be easily formed.
Further, since the coating thickness is different between the inner peripheral side and the outer peripheral side of the spiral wall, it is possible to form a coating having a reasonable thickness corresponding to the inner peripheral side and the outer peripheral side of the spiral wall, respectively. .
The “wall thickness of the spiral wall portion of the scroll base material” and the “film thickness of the coating” referred to in this specification refer to a thickness in a direction intersecting the projecting direction of the spiral wall portion.
[0009]
According to the scroll-type compressor described in claim 3 of the present invention, the wall thickness of the spiral wall having the coating decreases toward the tip end. Thereby, when the tip side of the spiral wall having the coating is largely thermally deformed in the radial direction as compared with the root side, the interference of the spiral wall having the coating with the spiral wall of the other scroll can be favorably suppressed.
[0010]
Further, according to the scroll-type compressor described in claim 4, the wall thickness of the spiral wall having the coating decreases toward the base side. This configuration may be implemented, for example, for orbiting scrolls. That is, when the orbiting scroll fluctuates due to the clearance and the orbiting moment required for the assembling of the orbiting scroll, it is possible to suppress the tip of the spiral wall of the fixed scroll from interfering with the root side of the spiral wall of the orbiting scroll. Therefore, it is possible to prevent or reduce the wear of the coating due to the interference of the tip of the spiral wall of the fixed scroll with the root side of the spiral wall of the orbiting scroll.
[0011]
Further, according to the scroll-type compressor described in claim 5, the relief portion of the coating is formed by the step surface. For this reason, the relief portion can be easily formed by processing the step surface by machining such as grinding and polishing on the coating.
[0012]
According to the scroll-type compressor described in claim 6 of the claims, the wall thickness of the spiral wall portion of the scroll base material is increased on the root side. For this reason, the strength of the spiral wall portion of the scroll base material and the strength of the entire scroll base material can be improved. This is effective in suppressing thermal deformation of the scroll provided with the coating.
[0013]
According to the method of manufacturing a scroll used in the scroll compressor according to claim 7, a coating is formed on the spiral wall of the scroll base material in the coating forming step. Thereafter, in the escape portion forming step, an escape portion is formed to avoid interference of the coating with the spiral wall of the other scroll due to thermal deformation of the scroll. Thereby, the scroll used for the scroll compressor according to the first aspect can be manufactured.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described. In the present embodiment, a scroll compressor used to compress air supplied as an oxidant to a fuel cell in a fuel cell system will be described as an example. For convenience of explanation, the main part will be described in detail after an outline of the scroll compressor is described. Further, for convenience of description, the discharge direction of the compression chamber of the scroll compressor is set to the front, and the motor direction is set to the rear.
[0015]
In FIG. 1, a housing 2 forming the outer shell of the scroll compressor forms a rear casing 5 forming a rear half (right half in FIG. 1) and a front half (left half in FIG. 1). And a front casing 10. The rear casing 5 and the front casing 10 are formed of, for example, an aluminum alloy.
[0016]
The front casing 10 includes a substantially disk-shaped substrate portion 11, a substantially spiral-shaped spiral wall 12 protruding from one side surface (the right side surface in FIG. 1) of the substrate portion 11, and one side surface of the substrate portion 11. A substantially annular outer peripheral wall 13 protruding from the outer peripheral portion (the right side surface in FIG. 1). The outer peripheral wall 13 is formed with a suction port 15 that communicates the inside and outside of the outer peripheral portion of the spiral wall 12. Further, the substrate portion 11 is formed with a discharge port 17 communicating with the inside and outside of the central portion of the spiral wall 12. In addition, since the front casing 10 also functions as a fixed scroll, it is hereinafter referred to as a fixed scroll (same as the front casing) 10.
[0017]
An orbiting scroll 20 is arranged in the housing 2. The orbiting scroll 20 has a substantially disk-shaped substrate portion 21 and a substantially spiral-shaped spiral wall 22 protruding from one side surface (the left side surface in FIG. 1) of the substrate portion 21. The spiral wall 22 is meshed with the spiral wall 12 of the fixed scroll 10 so as to alternately overlap at a position rotated by 180 ° relative to the spiral wall 12. The tip of the spiral wall 12 of the fixed scroll 10 is in contact with the substrate 21. The tip of the spiral wall 22 is in contact with the substrate 11 of the fixed scroll 10. The compression chamber 3 is formed by the fixed scroll 10 and the orbiting scroll 20. Note that a tip seal (not shown) for maintaining airtightness between the corresponding scroll and the substrate of the scroll is attached to the tip of each spiral wall 12, 22 of both scrolls 10, 20.
[0018]
At a substantially central portion of the rear casing 5, one end of a drive shaft 6 having a crank shape is rotatably supported via a bearing 61. One end of the drive shaft 6 is connected to a rotation shaft of a motor (not shown). The other end of the drive shaft 6 rotatably supports the substrate 21 of the orbiting scroll 20 via a bearing 62. The drive shaft 6 is provided with a balance weight 63 for balancing during rotation.
[0019]
One end of a crank-shaped rotation preventing shaft 8 is rotatably supported on the outer peripheral portion of the rear casing 5 via a bearing 81. The other end of the anti-rotation shaft 8 is branched, one of which supports the substrate portion 21 of the orbiting scroll 20 via a bearing 82 so as to be rotatable, and the other is provided with a balance weight 83. .
[0020]
In the scroll compressor, when the drive shaft 6 is rotated by a motor (not shown), the rotational force is transmitted to the orbiting scroll 20, and the orbiting scroll 20 orbits (revolves). Then, the spiral wall 22 of the orbiting scroll 20 orbits along the spiral wall 12 of the fixed scroll 10. At this time, the rotation of the orbiting scroll 20 is prevented by the rotation prevention shaft 8. As described above, when the orbiting scroll 20 orbits, the air is sucked into the outer peripheral portion of the compression chamber 3 from the suction port 15. In the compression chamber 3, the air spirally moves toward the center of the vortex of the compression chamber 3. In this process, air is compressed. The compressed air reaches the central portion of the vortex of the compression chamber 3 and is discharged from the discharge port 17 and then supplied to, for example, a fuel cell (not shown) as a downstream device.
[0021]
Next, the main parts will be described in detail. As shown in FIG. 3, the orbiting scroll 20 includes a scroll base material 23 having a spiral wall 24 that forms the main part of the spiral wall 22, and a coating 25 that covers the spiral wall 24. The scroll base material 23 is formed of, for example, an aluminum alloy. The coating 25 is formed by, for example, electrostatically applying a solid lubricant such as a fluorine-based resin or a silicon-based resin to the spiral wall portion 24 of the scroll base material 23. The spiral wall 22 of the orbiting scroll 20 is constituted by the spiral wall 24 of the scroll base material 23 and the coating 25.
[0022]
As shown in FIG. 3, the spiral wall portion 24 of the scroll base material 23 is formed in a substantially rectangular shape with a long section in the protruding direction (upward in FIG. 3). Further, a substantially stepped step surface 24a is formed on the outer peripheral side (left side in FIG. 3) of the tip end of the spiral wall portion 24. Thus, the spiral wall portion 24 is formed in a cross-sectional shape in which the wall thickness 24t1 on the root side (lower portion in FIG. 3) is larger than the wall thickness 24t2 on the front end side (upper portion in FIG. 3).
[0023]
On the outer peripheral side (left side in FIG. 3) of the leading end of the coating 25, a substantially stepped step surface 26 is formed by, for example, machining such as grinding or polishing (see FIG. 2). Edge portions 26a and 26b are formed at upper and lower ends of the step surface 26 (see FIG. 3).
A substantially stepped step surface 28 is also formed on the inner peripheral side (the right side in FIG. 3) of the leading end of the coating 25 by, for example, machining such as grinding or polishing (see FIG. 2). Edge portions 28a and 28b are formed at both upper and lower ends of the step surface 28 (see FIG. 3). In addition, the step surface 28 is formed to have smaller dimensions in both the film thickness direction and the protruding direction of the spiral wall 22 than the step surface 26. Further, the step surfaces 26 and 28 correspond to “concave portions” in this specification.
[0024]
Further, as shown in FIG. 3, the thickness of the coating 25 is different between the inner peripheral side and the outer peripheral side of the spiral wall 22. That is, in the coating 25 on the outer peripheral side of the spiral wall 22, the thickness 25t1 of the portion where the step surface 26 is formed is thicker than the thickness 25t2 of the other portion. Further, in the coating 25 on the inner peripheral side of the spiral wall 22, the thickness 25t3 of the portion where the step surface 28 is formed is smaller than the thickness 25t4 of the other portion. Further, the thickness 25t2 and the thickness 25t3 are substantially equal. Therefore, the wall thickness of the spiral wall 22 having the coating 25 changes from the tip side to the root side, and the tip side with the step surfaces 26 and 28 is thin.
[0025]
By the way, the step surfaces 26 and 28 (see FIG. 3) of the coating 25 are formed, for example, with the spiral wall 12 (see FIG. 1) of the fixed scroll 10 due to thermal deformation of the scroll at the time of high rotation and high temperature operation based on test data. The size and shape are determined according to the degree of interference. In particular, in the orbiting scroll 20, deformation of a portion not supported by the rotation prevention shaft 8 is greater than deformation of a portion supported by the rotation prevention shaft 8 (see FIG. 1). Therefore, step surfaces 26 and 28 are formed on the coating 25 in anticipation of the deformation of the orbiting scroll 20 in advance.
Then, as shown in FIG. 3, a relief portion 27 is formed by a step surface (recess) 26 of the coating 25 to avoid interference with the spiral wall 12 of the fixed scroll 10 due to thermal deformation of the scroll. In addition, a relief portion 29 for avoiding interference with the spiral wall 12 of the fixed scroll 10 due to thermal deformation of the scroll is formed by the step surface (recess) 28 of the coating 25. In addition, when the orbiting scroll 20 is not thermally deformed, that is, when the orbiting scroll 20 is operated at a low rotation speed and a low temperature, the escape portions 27 and 29 can secure a desired compression performance even when air leaks from the compression chamber 3. It is assumed to be formed in a size and shape.
Further, the processed shape of the relief portions 27 and 29 of the coating 25 and the shape of the spiral wall portion 24 of the scroll base material 23 do not need to be uniform from the center to the outer periphery of the spiral.
[0026]
The orbiting scroll 20 is manufactured by a manufacturing method including a coating forming step and a relief part forming step (see FIG. 3).
In the coating forming step, the coating 25 is formed by electrostatically applying a solid lubricant such as a fluorine-based resin or a silicon-based resin to the spiral wall portion 24 of the scroll base material 23 of the orbiting scroll 20. .
Next, in the relief portion forming step, the relief portions 27 and 29 are formed by subjecting the coating 25 to mechanical processing such as grinding and polishing.
[0027]
According to the above-described scroll compressor, the relief portions 27 and 29 are formed in the coating 25 that covers the spiral wall portion 24 of the scroll base material 23 in the orbiting scroll 20. Therefore, even when at least one of the scrolls 10 and 20 undergoes thermal deformation during high-rotation and high-temperature operation, interference between the spiral wall 12 (see the two-dot chain line 12 in FIG. 3) and the coating 25 of the fixed scroll 10 is not affected. Can be avoided. For example, when the spiral wall 22 of the orbiting scroll 20 is relatively deformed in the outer peripheral direction (to the left in FIG. 3), the spiral wall 12 of the fixed scroll 10 and the coating 25 Can be avoided. Conversely, when the spiral wall 22 of the orbiting scroll 20 is relatively deformed in the inner circumferential direction (rightward in FIG. 3), the spiral wall 12 of the fixed scroll 10 is moved by the inner circumferential escape portion 29 of the coating 25. Interference between the coating and the coating 25 can be avoided.
[0028]
As described above, since the interference between the spiral wall 12 of the fixed scroll 10 and the coating 25 can be avoided, abrasion of the coating 25 due to the interference can be prevented or reduced.
Also, even if interference occurs between the edge portions 26a, 26b, 28a, 28b corresponding to the upper and lower ends of the escape portions 27, 29 of the coating 25 and the corresponding spiral wall 12 of the fixed scroll 10, even if the interference occurs. The wear of the 25 edge portions 26a, 26b, 28a, 28b is reduced.
[0029]
The escape portions 27 and 29 of the coating 25 of the orbiting scroll 20 are not only thermally deformed by the scrolls 10 and 20 but also have a play between the drive shaft 6 and the orbiting scroll 20. It can be formed in consideration of at least one condition such as thermal deformation of the spiral walls 12 and 22 with respect to 11 and 21 and deformation due to the pressure in the compression chamber 3. When formed in this way, interference between the spiral wall 12 of the fixed scroll 10 and the coating 25 due to the added conditions can be advantageously avoided.
[0030]
Furthermore, since the amount of wear of the coating 25 of the orbiting scroll 20 is reduced, it is possible to suppress a decrease in the performance of the downstream device due to the wear powder.
[0031]
Further, by forming the step surfaces 26 and 28 to be the flank portions 27 and 29 on the coating 25 itself, the flank portions 27 are formed as compared with the case where each step surface is formed on the spiral wall portion 24 of the scroll base material 23, for example. , 29 can be easily formed.
Further, in the present embodiment, since the step surface 24a is formed in the spiral wall portion 24 of the scroll base material 23, the processing amount of the step surface 26 of the coating 25 can be reduced.
[0032]
The relief portions 27 and 29 of the coating 25 can be formed by changing the wall thickness of the spiral wall 22 having the coating 25 from the tip side to the root side. That is, the wall thickness of the spiral wall 22 having the coating 25 is the sum of the thickness of the coating 25 and the wall thickness of the spiral wall portion 24 of the scroll base material 23. Therefore, the relief portions 27 and 29 of the coating 25 can be easily formed by changing the thickness of the coating 25 and the wall thickness of the spiral wall portion 24 of the scroll base material 23 from the tip side to the root side.
Further, since the thickness of the coating 25 is different between the inner peripheral side and the outer peripheral side of the spiral wall 22, it is possible to form the coating 25 having a reasonable thickness corresponding to the inner peripheral side and the outer peripheral side of the spiral wall 22, respectively. Can be.
[0033]
In addition, the relief portions 27 and 29 of the coating 25 are formed by step surfaces 26 and 28. Therefore, the relief portions 27 and 29 can be easily formed by machining the step surfaces 26 and 28 by machining such as grinding and polishing of the coating 25.
[0034]
Further, the spiral wall portion 24 of the scroll base material 23 of the orbiting scroll 20 is thicker at the root side (see FIG. 3). Therefore, the strength of the spiral wall portion 24 of the scroll base material 23 and the strength of the scroll base material 23 as a whole can be improved. This is effective in suppressing thermal deformation of the orbiting scroll 20 provided with the coating 25.
[0035]
Further, according to the method of manufacturing the orbiting scroll 20 used in the above-described scroll compressor, the coating 25 is formed on the spiral wall 24 of the scroll base material 23 in the coating forming step, and thereafter, the coating 25 is formed on the coating 25 in the relief forming step. On the other hand, respective relief portions 27 and 29 are formed. Thereby, it is possible to avoid the interference between the spiral wall 22 of the fixed scroll 10 and the coating 25 due to the thermal deformation of the scroll, and to manufacture the orbiting scroll 20 that can prevent or reduce the wear of the coating 25 due to the interference. Can be.
[0036]
Further, even if the spiral wall portion 24 of the scroll base material 23 of the orbiting scroll 20 is formed as in the following modified examples 1 and 2, it is possible to obtain substantially the same operation and effect as in the above embodiment.
[Modification Example 1 of Spiral Wall 24]
As shown in FIG. 4, the spiral wall portion 24 of the scroll base material 23 in the above embodiment is formed to have a cross-sectional shape in which the wall thickness 24t is constant from the tip to the root. When the spiral wall portion 24 of the scroll base material 23 is formed as described above, the processing of the spiral wall portion 24 can be easily performed.
[Modification Example 2 of Spiral Wall 24]
As shown in FIG. 5, the spiral wall portion 24 of the scroll base material 23 in the above embodiment is formed in a trapezoidal cross section in which the wall thickness 24t gradually decreases from the tip toward the root. When the spiral wall portion 24 of the scroll base material 23 is formed as described above, the strength of the spiral wall portion 24 and thus the strength of the entire scroll base material 23 can be improved. This is effective in suppressing thermal deformation of the orbiting scroll 20.
[0037]
Further, even if the relief portions 27 and 29 of the coating 25 of the orbiting scroll 20 are formed as in the following modified examples 1 to 3, it is possible to obtain substantially the same operation and effect as in the above embodiment.
[Modification 1 of escape portions 27 and 29]
As shown in FIG. 6, tapered inclined surfaces 261 and 281 are formed on the outer peripheral surface and the inner peripheral surface of the coating 25 of the orbiting scroll 20 in the above embodiment by, for example, machining. The escape portions 27 and 29 are formed by the inclined surfaces 261 and 281 of the coating 25, respectively. Further, in the present modification, the spiral wall portion 24 of the second modification (see FIG. 5) is used as the spiral wall portion of the scroll base material 23. However, in the above embodiment (see FIG. 3) or the first modification. The spiral wall 24 (see FIG. 4) can be used.
According to this modified example, the wall thickness of the spiral wall 22 having the coating 25 decreases toward the distal end. Thereby, when the tip side of the spiral wall 22 having the coating 25 undergoes a large thermal deformation in the radial direction as compared with the root side, interference of the spiral wall 22 having the coating 25 with the spiral wall 12 (see FIG. 1) of the fixed scroll 10 is prevented. It can be suppressed well.
[0038]
[Modification 2 of escape portions 27 and 29]
As shown in FIG. 7, parallel surfaces 262 and 282 that are parallel to each other by, for example, machining are formed on the outer peripheral surface and the inner peripheral surface on the base side of the coating 25 of the orbiting scroll 20 in the first modification (see FIG. 6). It was formed.
[0039]
[Modification 3 of escape portions 27 and 29]
As shown in FIG. 8, on the outer peripheral surface of the coating 25 of the orbiting scroll 20 in the above embodiment, an inclined surface 263 that gradually reduces the film thickness 25t from the central portion toward the distal end side by, for example, machining, An inclined surface 264 is formed to gradually reduce the thickness 25t toward the root side. Thus, upper and lower relief portions 27 are formed by the inclined surfaces 263 and 264 on the upper and lower sides on the outer peripheral side of the coating 25. Further, as the spiral wall portion 24 of the scroll base material 23 of this modification example, the spiral wall portion 24 of Modification Example 1 (see FIG. 4) or Modification Example 2 (see FIG. 5) can be used.
According to this modification, the wall thickness of the spiral wall 22 having the coating 25 decreases toward the root side. Therefore, when the orbiting scroll 20 fluctuates due to the clearance and the orbiting moment required for assembling the orbiting scroll 20, the tip of the spiral wall 12 of the fixed scroll 10 (see FIG. 1) is located at the root side of the spiral wall 22 of the orbiting scroll 20. (See the two-dot chain line 12 in FIG. 8). Therefore, it is possible to prevent or reduce abrasion of the coating 25 due to interference of the tip of the spiral wall 12 of the fixed scroll 10 with the root side of the spiral wall 22 of the orbiting scroll 20.
[0040]
Also, the outer peripheral surface of the outer peripheral vortex end 240 (see FIG. 2) of the spiral wall portion 24 in the scroll base material 23 of the orbiting scroll 20 does not need to be directly compressed by the air in the compression chamber 3. Further, the outer peripheral side vortex end 240 of the vortex wall portion 24 is easily deformed radially outward with respect to the substrate portion 21. For this reason, as shown in FIG. 9, a reinforcing portion 241 having an R surface 242 is provided at a corner portion on the base side between the outer peripheral surface of the spiral wall portion 24 (specifically, the outer peripheral side vortex end portion 240) and the substrate portion 21. It is provided. Therefore, the reinforcement portion 241 can suppress the deformation of the spiral wall portion 24 (specifically, the outer peripheral side spiral end portion 240) outward in the radial direction (leftward in FIG. 9). This is also effective in suppressing thermal deformation of the scroll provided with the coating. Further, the reinforcing portion 241 can be provided on the spiral wall 12 of the fixed scroll 10 in the same manner as described above. In the spiral wall portion 24 of the scroll base material 23 of the orbiting scroll 20, a portion forming the compression chamber 3, that is, an outer peripheral surface and an inner peripheral surface portion other than the outer peripheral surface of the outer peripheral side vortex end 240 (see FIG. 2) are also included. At the corner between the spiral wall 24 and the substrate 21, there is provided an R surface (not shown) having a small radius that does not interfere with the compression of air, and the radius of the R surface 242 is larger than the radius. Shall be.
[0041]
Further, the reinforcing portion 241 of the outer peripheral side vortex end 240 of the spiral wall portion 24 in the scroll base material 23 of the orbiting scroll 20 can be formed as in the following first and second modifications.
[Modification Example 1 of Reinforcing Section 241]
As shown in FIG. 10, a reinforcing portion having a C surface 244 is provided at a corner portion on the base side between the outer peripheral surface of the spiral wall portion 24 (more specifically, the outer peripheral side vortex end portion 240) of the scroll base material 23 and the substrate portion 21. 243 are provided.
[Modification Example 2 of Reinforcing Section 241]
As shown in FIG. 11, a reinforcement having a step surface 246 at a corner portion on the base side between the outer peripheral surface of the spiral wall portion 24 (specifically, the outer peripheral side vortex end portion 240) of the scroll base material 23 and the substrate portion 21. A part 245 is provided.
[0042]
The present invention is not limited to the above embodiment, and can be modified without departing from the spirit of the present invention. For example, in the present invention, the scroll-type compressor may compress not only air but also gas such as hydrogen gas or other fluid. Further, the present invention can be applied not only to the orbiting scroll 20 but also to the fixed scroll 10. In addition, any one of the escape portions 27 and 29 of the coating 25 of the orbiting scroll 20 in the above embodiment can be omitted. Further, the material of the scroll base material 23 of the fixed scroll 10 and the orbiting scroll 20 is not limited to an aluminum alloy.
[0043]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to avoid interference between the scroll wall of the other scroll and the coating due to thermal deformation of the scroll, and to prevent or reduce abrasion of the coating due to the interference. it can.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an outline of a scroll compressor according to one embodiment of the present invention.
FIG. 2 is a perspective view showing an orbiting scroll.
FIG. 3 is a sectional view showing a spiral wall of the orbiting scroll.
FIG. 4 is a cross-sectional view showing a first modification of the spiral wall portion of the scroll base material.
FIG. 5 is a cross-sectional view showing a second modification of the spiral wall portion of the scroll base material.
FIG. 6 is a cross-sectional view showing a first modification of the relief portion of the coating.
FIG. 7 is a cross-sectional view showing a second modification of the relief portion of the coating.
FIG. 8 is a cross-sectional view showing a modification 3 of the escape portion of the coating.
FIG. 9 is a sectional view showing a reinforcing portion of a spiral wall portion of the scroll base material.
FIG. 10 is a cross-sectional view illustrating a first modification of the reinforcing portion of the spiral wall portion of the scroll base material.
FIG. 11 is a cross-sectional view showing a second modification of the reinforcement of the spiral wall of the scroll base material.
FIG. 12 is a sectional view showing an orbiting scroll.
FIG. 13 is a sectional view showing a spiral wall of a conventional scroll.
[Explanation of symbols]
3 compression chamber
10 Fixed scroll (front casing)
12 Spiral wall
22 Spiral wall
23 Scroll base material
24 spiral wall
25 Coating
26 step surface
27 Escape
28 step surface
29 Escape

Claims (7)

A fixed scroll and an orbiting scroll each having a spiral wall meshing with each other are provided. When the orbiting scroll orbits with respect to the fixed scroll, a fluid sucked into a compression chamber formed between the two scrolls is compressed. Scroll compressor configured as follows,
At least one of the fixed scroll and the orbiting scroll includes a scroll base material having a spiral wall portion forming the main body of the spiral wall, and a coating covering the spiral wall portion of the scroll base material,
A scroll compressor according to claim 1, wherein the coating has a relief portion for avoiding interference with the scroll wall of the other scroll due to thermal deformation of the scroll. By changing the wall thickness of the spiral wall having the coating from the tip side to the base side, a relief portion of the coating is formed,
2. The scroll compressor according to claim 1, wherein a thickness of the coating is different between an inner peripheral side and an outer peripheral side of the spiral wall. 3. The scroll-type compressor according to claim 2, wherein a wall thickness of the spiral wall having the coating decreases toward a distal end side. The scroll type compressor according to claim 2 or 3, wherein a wall thickness of the spiral wall having the coating decreases toward a root side. The scroll compressor according to any one of claims 1 to 4, wherein a relief portion of the coating is formed by a step surface. The scroll compressor according to any one of claims 1 to 5, wherein a wall thickness of the spiral wall portion of the scroll base material is thicker on a root side. A method for manufacturing a scroll used in the scroll compressor according to claim 1,
A coating forming step of forming a coating on the spiral wall of the scroll base material;
A method of forming a relief portion for forming a relief portion for avoiding interference of the coating with the spiral wall of the other scroll due to thermal deformation of the scroll.

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