Scroll compressor

Abstract

Provided is a scroll compressor. The scroll compressor includes a fixed scroll and a revolving scroll. The revolving scroll includes a revolving-side scroll wall. The revolving-side scroll wall is shaped to trace an involute and has a plate thickness. The revolving-side scroll wall includes a thin-walled portion that is thinner than the surrounding portion. The thin-walled portion includes a portion at an involute angle that is obtained by subtracting 360° from a maximum value of the involute angle.

Description

Technical Field

[0001] This disclosure relates to scroll compressors. Background Technology

[0002] A scroll compressor has a fixed scroll component fixed in the housing and a rotating scroll component that revolves relative to the fixed scroll component (for example, see Japanese Patent Application Publication No. 2020-193582).

[0003] The fixed scroll member has a fixed-side base plate and a fixed-side scroll wall erected from the fixed-side base plate, and the rotary scroll member has a rotary-side base plate and a rotary-side scroll wall erected from the rotary-side base plate. Furthermore, by engaging the fixed-side scroll wall and the rotary-side scroll wall with each other, a compression chamber is defined, which compresses the fluid by reducing its volume based on the revolution motion of the rotary scroll member.

[0004] The size of a scroll compressor needs to be suitable for the size of the object it is installed on. Therefore, the size of a scroll compressor is a constraint. On the other hand, in a scroll compressor, it is desirable to increase the amount of fluid that can be enclosed in the compression chamber to improve performance. In other words, in a scroll compressor, it is desirable to improve compression efficiency within a constrained size. Summary of the Invention

[0005] One scroll compressor comprises: a fixed scroll member having a fixed-side base plate and a fixed-side scroll wall erected from the fixed-side base plate; and a rotary scroll member having a circular rotary-side base plate opposite to the fixed-side base plate and a rotary-side scroll wall erected from the rotary-side base plate toward the fixed-side base plate and engaging with the fixed-side scroll wall. The scroll compressor mechanism compresses fluid within a compression chamber defined by the fixed scroll member and the rotary scroll member by rotating the rotary scroll member. The rotary-side scroll wall has a shape that depicts an involute curve and has a plate thickness. The rotary-side scroll wall has a thin-walled portion that is thinner than its surroundings. The thin-walled portion includes a portion at the involute angle, obtained by subtracting 360° from the maximum value of the involute angle. Attached Figure Description

[0006] Figure 1 This is a cross-sectional view showing one embodiment of a scroll compressor.

[0007] Figure 2 This is a diagram showing a rotating scroll component.

[0008] Figure 3 This is a diagram showing a comparative example of a rotating scroll component.

[0009] Figure 4 This is a diagram showing a comparative example of a rotating scroll component.

[0010] Figure 5 It is a graph showing the relationship between plate thickness and involute angle. Detailed Implementation

[0011] The following is based on Figures 1-5 One embodiment of a scroll compressor will be described. An example of a vehicle is a device that mounts a scroll compressor.

[0012] <Shell>

[0013] like Figure 1 As shown, the scroll compressor 10 is an electric scroll compressor. The scroll compressor 10 includes a housing 11. The housing 11 has an intake port 11a for drawing in fluid and an outlet port 11b for discharging fluid. The housing 11 is generally cylindrical in shape as a whole.

[0014] The housing 11 has a first part 12 and a second part 13 in the shape of a bottomed cylindrical shell. The first part 12 and the second part 13 are assembled together with their open ends joined together. An intake port 11a is provided in the first part 12. An exhaust port 11b is provided in the second part 13.

[0015] The scroll compressor 10 includes a rotating shaft 14, a compression unit 15, and an electric motor 16. The rotating shaft 14, the compression unit 15, and the electric motor 16 are housed within a housing 11.

[0016] <Rotation axis>

[0017] The rotating shaft 14 is housed within the housing 11 in a rotatable state. Within the housing 11, a shaft support member 21 is provided to support the rotating shaft 14. The shaft support member 21 is fixed to the housing 11, for example, at a position between the compression section 15 and the electric motor 16. A through hole 23 is formed in the shaft support member 21. A first bearing 22 is provided in the through hole 23. The rotating shaft 14 is inserted through the through hole 23. The shaft support member 21 is opposite to the bottom 12b of the first part 12. A cylindrical boss 24 protrudes from the bottom 12b. A second bearing 25 is provided inside the boss 24. The rotating shaft 14 is supported in the housing 11 in a rotatable state by the two bearings 22 and 25.

[0018] <Electric Motor>

[0019] An electric motor 16 is disposed within the housing 11 on the side of the inlet 11a. The electric motor 16 rotates the rotating shaft 14. The electric motor 16 drives the compression section 15. The electric motor 16 includes a rotor 51 that rotates integrally with the rotating shaft 14 and a stator 52 surrounding the rotor 51. The rotor 51 is connected to the rotating shaft 14. The stator 52 is fixed to the inner circumferential surface of the first part 12 of the housing 11. The stator 52 has a stator core 53 that is radially opposed to the cylindrical rotor 51 and a coil 54 wound around the stator core 53.

[0020] <Compression Section>

[0021] The compression unit 15 is disposed within the housing 11 on the side closer to the outlet 11b than the electric motor 16. The compression unit 15 compresses the fluid drawn in from the suction port 11a and discharges it from the outlet 11b. The compression unit 15 includes a fixed scroll member 31 and a rotating scroll member 32. The fixed scroll member 31 is fixed to the housing 11. The rotating scroll member 32 rotates relative to the fixed scroll member 31. The rotating scroll member 32 is capable of orbiting the fixed scroll member 31.

[0022] The fixed scroll member 31 has a fixed side base plate 31a, a fixed side scroll wall 31b, and a spacer wall 31c. The fixed side base plate 31a is a circular plate disposed on the same axis as the rotation axis 14. The fixed side scroll wall 31b rises from the fixed side base plate 31a. The spacer wall 31c rises from the outer periphery of the fixed side base plate 31a. The spacer wall 31c is disposed radially on the fixed side base plate 31a at a position closer to the outer periphery than the fixed side scroll wall 31b.

[0023] The rotating scroll member 32 has a rotating side base plate 32a and a rotating side scroll wall 32b. The rotating side base plate 32a is circular and is opposite to the fixed side base plate 31a. The rotating side scroll wall 32b rises from the rotating side base plate 32a toward the fixed side base plate 31a.

[0024] The rotating scroll member 32 is housed in a space 29 defined within the housing 11. The space 29 is defined by the shaft support member 21, the fixed side base plate 31a, and the partition wall 31c. The rotating scroll member 32 rotates within the space 29.

[0025] The fixed scroll member 31 and the rotating scroll member 32 mesh with each other. Specifically, the fixed-side scroll wall 31b and the rotating-side scroll wall 32b mesh with each other. The front end face of the fixed-side scroll wall 31b contacts the rotating-side substrate 32a, and the front end face of the rotating-side scroll wall 32b contacts the fixed-side substrate 31a. Furthermore, the fixed scroll member 31 and the rotating scroll member 32 define a compression chamber 33 for compressing the fluid. In the scroll compressor 10, multiple compression chambers 33 are formed simultaneously.

[0026] In the compression chamber 33, there are two compression chambers: a first compression chamber formed by the inner peripheral side of the fixed-side vortex wall 31b and the outer peripheral side of the rotating-side vortex wall 32b, and a second compression chamber formed by the outer peripheral side of the fixed-side vortex wall 31b and the inner peripheral side of the rotating-side vortex wall 32b.

[0027] The radius of the circular trajectory traced by the rotating scroll member 32 during its revolution is defined as the radius of gyration. The rotating scroll wall 32b is configured not to extend from the outer periphery of the rotating substrate 32a. Therefore, the radius of gyration of the rotating scroll member 32 is determined by the diameter of the rotating substrate 32a. Furthermore, since the rotating scroll member 32 revolves within the space 29, the diameter of the rotating substrate 32a can be said to be determined by the size of the space 29.

[0028] A suction passage 34 is formed in the shaft support member 21. The suction passage 34 is a passage for drawing fluid into the compression chamber 33. The rotary scroll member 32 is configured to revolve in conjunction with the rotation of the rotating shaft 14. Specifically, a portion of the rotating shaft 14 protrudes toward the compression section 15 via the insertion hole 23 of the shaft support member 21. An eccentric shaft 35 is provided at an eccentric position relative to the axis L of the rotating shaft 14 on the end face of the compression section 15 side of the rotating shaft 14. A bushing 36 is provided on the eccentric shaft 35. The bushing 36 and the rotating side base plate 32a are connected via a bearing 37.

[0029] The scroll compressor 10 includes multiple rotation limiting sections 38. Each rotation limiting section 38 allows the rotating scroll member 32 to revolve, while limiting its rotation. The rotating scroll member 32 revolves in the forward direction when the rotating shaft 14 rotates in a predetermined direction. The rotating scroll member 32 revolves in the forward direction around the axis of the fixed scroll member 31, i.e., the axis L of the rotating shaft 14. As a result, the volumes of the first and second compression chambers decrease, thus compressing the fluid drawn into the first and second compression chambers via the suction passage 34. The compressed fluid is discharged from the discharge port 41 provided on the fixed side substrate 31a. The fluid discharged from the discharge port 41 is discharged from the discharge outlet 11b. A discharge valve 42 covering the discharge port 41 is provided on the fixed side substrate 31a. The fluid compressed in the compression chamber 33 pushes open the discharge valve 42 and is discharged from the discharge port 41.

[0030] <Transformer>

[0031] The scroll compressor 10 includes a converter 55. The converter 55 is a drive circuit that drives the electric motor 16. The converter 55 is housed within a cylindrical cover member 56 mounted on the bottom 12b of the first part 12 of the housing 11. The converter 55 is electrically connected to a coil 54.

[0032] <Details about the rotary scroll component>

[0033] exist Figure 2 Only the rotating side base plate 32a and the rotating side vortex wall 32b of the rotating vortex member 32 are shown. The rotating side vortex wall 32b is a vortex-shaped structure extending from the first end E located on the center side of the vortex toward the second end S located on the outer periphery side of the vortex.

[0034] In the rotating side vortex wall 32b, the end including the first end E is formed in an arc shape. The rotating side vortex wall 32b is a plate-thick shape that extends along an involute except for a portion. The outer peripheral wall 321 and the inner peripheral wall 322 of the rotating side vortex wall 32b are formed by an involute except for a portion.

[0035] An involute is a plane curve whose normal is always tangent to the base circle. In other words, an involute is a plane curve formed by the trajectory drawn from a point on a straight line when the line rolls without slipping on a fixed base circle. An involute, also called an involute, is the trajectory drawn by the endpoints of a filament when it is stretched and unwound from the base circle without loosening. The involute angle is the angle of rotation of the filament when it is stretched and unwound about the center of the base circle. Furthermore, in the rotating vortex wall 32b, the first end E corresponds to the beginning of the involute winding, and the second end S corresponds to the end of the involute winding.

[0036] The rotating side vortex wall 32b has a continuous arc portion F starting from the beginning of the involute winding. The arc portion F is an arc connected to the first end E in the rotating side vortex wall 32b.

[0037] The involute angle [°] represents the angle from the first end E, where the involute begins to wind along the rotating side scroll wall 32b, to the second end S, where the winding ends. The minimum value of the involute angle is "0", or zero, at the first end E. The involute angle increases from the first end E along the rotating side scroll wall 32b towards the second end S. When the number of rolls of the fixed side scroll wall 31b and the rotating side scroll wall 32b is set to about 2.5 rolls, the maximum value of the involute angle is about 900°.

[0038] <Thickness of the rotating vortex wall>

[0039] The dimension between the outer peripheral wall 321 and the inner peripheral wall 322 of the rotating side vortex wall 32b is set as the plate thickness W [mm]. As described above, the outer peripheral wall 321 and the inner peripheral wall 322 of the rotating side vortex wall 32b are formed by an involute, except for a portion thereof. More specifically, the inner peripheral wall 322 is formed by an involute that is offset inward from the involute forming the outer peripheral wall 321 to a degree that does not interfere with the fixed side vortex wall 31b during rotation.

[0040] like Figure 2 and Figure 5As shown, corresponding to the increase of the involute angle from the minimum along the arc F, the plate thickness W of the rotating vortex wall 32b increases sharply and then decreases sharply after reaching a maximum value.

[0041] The rotating vortex wall 32b includes a linear portion R1 and a nonlinear portion R2 defined by the relationship between the extension angle and the plate thickness W. Furthermore, the rotating vortex wall 32b includes both linear portions R1 and nonlinear portions R2 between the minimum and maximum values ​​of the extension angle. Specifically, the rotating vortex wall 32b includes two linear portions R1 and one nonlinear portion R2 at the portion where the extension angle increases compared to the circular arc portion F. That is, between the first end E and the second end S of the rotating vortex wall 32b, the circular arc portion F, the linear portion R1, the nonlinear portion R2, and the additional linear portion R1 are arranged sequentially.

[0042] The linear section R1 is the portion between the minimum and maximum values ​​of the extension angle. The linear section R1 is the part where the plate thickness W decreases linearly with the increase of the extension angle. Here, the ratio of the decrease in plate thickness W to the increase in extension angle is defined as the "thickness change rate". Each of the two linear sections R1 is a part with a constant thickness change rate. In each of the two linear sections R1, the plate thickness W of the rotating side vortex wall 32b decreases linearly with the increase of the extension angle. Furthermore, the extension angle of the boundary between the linear section R1 with the smaller extension angle and the arc section F is referred to as the "first extension angle G1". The two linear sections R1 are located on both sides of the nonlinear section R2 described below.

[0043] The nonlinear section R2 is the portion between the minimum and maximum values ​​of the extension angle. The nonlinear section R2 is the part where the plate thickness W changes nonlinearly with the increase of the extension angle, and it includes the minimum value of the plate thickness W. The nonlinear section R2 is the part where the plate thickness W changes abruptly from the first end E to the second end S of the rotating vortex wall 32b, excluding the arc section F. The boundary between the linear section R1 and the nonlinear section R2 with the smaller extension angle is referred to as the "second extension angle G2". The boundary between the linear section R1 and the nonlinear section R2 with the larger extension angle is referred to as the "third extension angle G3". Therefore, the nonlinear section R2 is the part located between the second extension angle G2 and the third extension angle G3. The nonlinear section R2 becomes a thin-walled section where the plate thickness W is thinner than the surrounding area, bounded by the second extension angle G2 and the third extension angle G3. Therefore, the rotating vortex wall 32b has a thin-walled portion with a plate thickness W that is thinner than the surrounding area.

[0044] In the nonlinear region R2, the plate thickness W becomes extremely thin as the elongation angle increases from the second elongation angle G2, reaching a minimum, and then rapidly thickens from the minimum towards the third elongation angle G3. Therefore, the plate thickness W of the rotating vortex wall 32b becomes minimum in the nonlinear region R2.

[0045] like Figure 2 As shown, in the nonlinear part R2, the outer peripheral wall 321 and inner peripheral wall 322 of the rotating vortex wall 32b are displaced in a manner that brings them closer to each other in the thickness direction. That is, the thickness W does not decrease only when either the outer peripheral wall 321 or the inner peripheral wall 322 is displaced. Furthermore, in the thickness direction of the rotating vortex wall 32b, at the position where the outer peripheral wall 321 and the inner peripheral wall 322 approach each other, the thickness W of the rotating vortex wall 32b becomes the thinnest. The rotating vortex wall 32b has a minimum value at the position where the thickness W is the thinnest.

[0046] like Figure 5 As shown, in the rotating vortex wall 32b, the involute angle obtained by subtracting 360° from the second end S is set as the reference involute angle G. This reference involute angle G is located within the range of the nonlinear section R2. That is, the reference involute angle G is located between the second involute angle G2 and the third involute angle G3. Therefore, the nonlinear section R2 includes the involute angle obtained by subtracting 360° from the maximum value of the involute angle. Thus, the reference involute angle G is set at a position where the plate thickness W of the rotating vortex wall 32b is thinner than that of the linear section R1.

[0047] Furthermore, the minimum value of the plate thickness W of the rotating-side vortex wall 32b is located at a gradually extending angle closer to the first end E than the reference gradually extending angle G. In other words, the minimum value of the plate thickness W is located at a gradually extending angle smaller than the reference gradually extending angle G. Therefore, regarding the rotating-side vortex wall 32b, the plate thickness W becomes minimal at the portion of the nonlinear section R2 where the gradually extending angle obtained by subtracting 360° or more from the maximum value. Therefore, in the rotating-side vortex wall 32b, the thinnest position of the plate thickness W is located at a gradually extending angle in the nonlinear section R2 that is smaller than the gradually extending angle obtained by subtracting 360° or more from the maximum value. The second end S of the rotating-side vortex wall 32b can be said to overlap radially with respect to the nonlinear section R2 on the rotating-side substrate 32a.

[0048] <Functions and Effects>

[0049] Next, the function and effect of the scroll compressor 10 will be explained.

[0050] (1) Figure 3 and Figure 4 The comparative example shows a rotary scroll member 60. The rotary scroll member 60 of the comparative example can be said to be a rotary scroll member that is generally found in scroll compressors.

[0051] The comparative example of the rotating vortex member 60 has a rotating side base plate 61 and a rotating side vortex wall 62 excluding the nonlinear portion R2. For example... Figure 5As shown by the double-dotted line, the thickness W of the rotary vortex wall 62 in the comparative example decreases linearly with the increase of the extension angle from the first extension angle G1 to the second end S. In other words, the thickness W of the rotary vortex wall 62 in the comparative example thins from the first extension angle G1 at a certain rate of change. Therefore, the rotary vortex wall 62 in the comparative example can be considered to be a linear portion R1 except for the arc portion F. Figure 3 and Figure 5 In order to clarify the differences between this embodiment and the comparative example, the second end S of this embodiment is referred to as "S1", and the second end S of the comparative example is referred to as "S2". Furthermore, as... Figure 3 As shown, the extension angle at the second end S2 in the comparative example is smaller than the extension angle at the second end S1 in this embodiment. Therefore, the number of rolls of the rotating side vortex wall 32b in this embodiment is greater than the number of rolls of the rotating side vortex wall 62 in the comparative example.

[0052] like Figure 4 As shown, in the comparative example of the rotating scroll member 60, we consider the case where the diameter of the rotating side substrate 61 is set to be the same as the diameter of the rotating side substrate 32a. In the comparative example, when we want to increase the number of rolls of the rotating side scroll wall 62, the position of the second end S where the maximum value of the extension angle is located will extend from the outer edge of the rotating side substrate 61. However, in this embodiment, the thickness W of the portion of the rotating side scroll wall 32b at the location obtained by subtracting 360° from the extension angle at the position where the second end S should extend is reduced compared to the surrounding area. Therefore, as Figure 2 As shown, the position of the second end S of the rotating-side spiral wall 32b can be located inside the outer edge of the rotating-side substrate 32a. As a result, the position of the second end S does not extend beyond the outer edge of the rotating-side substrate 32a, and the number of rolls of the rotating-side spiral wall 32b can be increased compared to the comparative example. That is, as... Figure 3 As shown by the double-dotted line, the position of the second end S, where the maximum value of the involute angle is located, can be extended from the second end S2 in the comparative example to the second end S1 in this embodiment along the circumferential direction of the rotary side substrate 32a. In other words, the number of rolls of the rotary side vortex wall 32b can be increased (extended) in a manner that does not increase the diameter of the rotary side substrate 32a.

[0053] Therefore, in the rotating vortex member 32 of this embodiment, when a first compression chamber is formed, compared with the comparative example, the amount of fluid trapped in the first compression chamber is increased by the nonlinear portion R2. That is, by reducing the plate thickness W by recessing the outer peripheral wall 321 of the rotating vortex wall 32b, the amount of fluid trapped in the first compression chamber is increased.

[0054] Similarly, in the case where a second compression chamber is formed, compared to the comparative example, the amount of fluid trapped in the second compression chamber is increased by the nonlinear part R2. That is, by reducing the plate thickness W by recessing the inner peripheral wall 322 of the rotating vortex wall 32b, the amount of fluid trapped in the second compression chamber is increased.

[0055] Therefore, by using the rotary scroll member 32 with the nonlinear portion R2, the number of rolls of the rotary scroll wall 32b can be increased (extended) without increasing the diameter of the rotary scroll plate 32a. As a result of increasing (extending) the number of rolls of the rotary scroll wall 32b, the amount of fluid that can be enclosed in the compression chamber 33 increases, thereby improving the compression efficiency of the scroll compressor 10.

[0056] Therefore, considering the mountability to the mounting object, and given the size constraints of the scroll compressor 10, it is possible to improve the compression efficiency without making the rotating scroll 32, and consequently the housing 11, too large.

[0057] (2) The thin-walled section is the nonlinear section R2. Furthermore, the plate thickness W of the rotating side scroll wall 32b becomes minimal at the nonlinear section R2. The scroll compressor 10 has a linear section R1 surrounding the nonlinear section R2, which is the thin-walled section. Moreover, by having the nonlinear section R2 including the thin-walled section, the number of rolls of the rotating side scroll wall 32b can be increased (extended) without degrading performance compared to a typical scroll compressor.

[0058] (3) The thickness W of the rotating vortex wall 32b becomes minimal at the inclination angle obtained by subtracting more than 360° from the maximum value of the inclination angle. Therefore, the nonlinear part R2 can be formed from an inclination angle smaller than the position obtained by subtracting more than 360° from the second end S of the rotating vortex wall 32b.

[0059] (4) The nonlinear portion R2 is positioned to include the involute angle obtained by subtracting 360° from the maximum value of the involute angle. Therefore, the plate thickness W at the outer periphery of the rotating vortex wall 32b is not thinner than the plate thickness W formed by the involute. Thus, even with the nonlinear portion R2 included, the decrease in rigidity of the outer periphery of the rotating vortex wall 32b can be suppressed, thereby suppressing the vibration of the rotating vortex wall 32b.

[0060] (5) By providing a nonlinear portion R2 in the rotating-side vortex wall 32b, the number of rolls in the rotating-side vortex wall 32b can be longer than in the comparative example. Correspondingly, the number of rolls in the fixed-side vortex wall 31b can also be longer than in the comparative example. As a result, the compression stroke of the fixed-side vortex wall 31b and the rotating-side vortex wall 32b, that is, the time from the start of compression to discharge, can be extended, thus suppressing overcompression. In addition, since the number of rolls in the rotating-side vortex wall 32b and the fixed-side vortex wall 31b can be extended, the differential pressure between the multiple compression chambers 33 at the same timing is reduced, thus suppressing recompression.

[0061] The implementation method can be modified as follows. This implementation method and the following modifications can be combined with each other within the scope of technical inconsistency.

[0062] The nonlinear part R2 can also be formed by making either the outer peripheral wall 321 or the inner peripheral wall 322 recessed towards the other.

[0063] The part where the plate thickness W becomes minimal can be located at the inclination angle obtained by subtracting 360° from the maximum value of the inclination angle, i.e., the reference inclination angle G, or it can be located at an inclination angle larger than the reference inclination angle G.

[0064] The rotating vortex wall 32b can also be shaped with multiple portions where the plate thickness W becomes minimal. In this case, one of the nonlinear portions R2, including the portion where the plate thickness W becomes minimal, includes a reference inclination angle G.

[0065] The number of rolls can also be changed by altering the maximum value of the involute angle of the rotating vortex wall 32b. For example, the maximum value of the involute angle of the rotating vortex wall 32b can be slightly larger than 360°, resulting in a slightly longer number of rolls than 1 roll; or the maximum value of the involute angle can be 540°, resulting in 1.5 rolls. Furthermore, the maximum value of the involute angle of the rotating vortex wall 32b can be 1080°, resulting in 3 rolls. Additionally, the number of locations where the nonlinear section R2 is installed can be adjusted based on the number of rolls.

[0066] The scroll compressor 10 may not be an electric scroll compressor; for example, it may be a scroll compressor 10 driven by an engine.

Claims

1. A scroll type compressor, comprising: a fixed scroll having a fixed-side base plate and a fixed-side scroll wall rising from the fixed-side base plate; and a revolving scroll having a circular plate-shaped revolving-side base plate opposite the fixed-side base plate and a revolving-side scroll wall rising from the revolving-side base plate toward the fixed-side base plate and engaging with the fixed-side scroll wall, the scroll type compressor being configured to compress a fluid in a compression chamber defined by the fixed scroll and the revolving scroll by revolving the revolving scroll, the revolving-side scroll wall is a shape that traces an involute and has a plate thickness, the revolving-side scroll wall has a thin wall portion that is thinner than a surrounding portion in the plate thickness, the thin wall portion includes a portion at an involute angle obtained by subtracting 360° from a maximum value of the involute angle, the revolving-side scroll wall has: a linear portion that is a portion in which the plate thickness linearly decreases in correspondence with an increase in the involute angle; and a nonlinear portion that is a portion in which the plate thickness changes nonlinearly in correspondence with an increase in the involute angle, the thin wall portion is the nonlinear portion, and the plate thickness becomes a minimum at the nonlinear portion.

2. The scroll type compressor according to claim 1, wherein, with respect to the revolving-side scroll wall, the plate thickness becomes a minimum at a portion in the nonlinear portion that is at an involute angle obtained by subtracting 360° or more from the maximum value of the involute angle.

3. The scroll type compressor according to claim 1 or 2, wherein the revolving-side scroll wall has a first end that is a start of winding of the involute and a second end that is an end of winding of the involute, the revolving-side scroll wall includes a circular arc portion that is a circular arc shape, and between the first end and the second end of the revolving-side scroll wall, the circular arc portion, the linear portion, the nonlinear portion, and an additional linear portion are sequentially arranged. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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