Compressor manufacturing method

Abstract

To mitigate the unevenness of the inner diameter of a cylindrical body. [Solution] A method for manufacturing a compressor 100 comprises a cylindrical body 31 housing a compression mechanism 10 and a motor unit 20, an accessory support portion 40 welded to the outer circumferential surface 31a of the cylindrical body, and an accessory 50 supported by the accessory support portion, and includes a step of expanding the cylindrical body so that the inner diameter R11 of the portion of the cylindrical body corresponding to a first region 34 is larger than the average inner diameter of the cylindrical body 31, and a step performed after the step of expanding the cylindrical body, in which the accessory support portion is welded to the outer circumferential surface of the cylindrical body corresponding to the first region.

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a compressor.

Background Art

[0002] For example, a compressor is known that includes a compression mechanism section that compresses a refrigerant, a crankshaft that transmits a rotational driving force to the compression mechanism section, an electric motor section that generates a rotational driving force for the crankshaft, and a pressure-sealed container that houses these compression mechanism section, crankshaft, and electric motor section (see Patent Document 1). The pressure-sealed container has a cylindrical body section, a bottom section joined to one end of the body section, and a lid section joined to the other end of the body section.

[0003] In the method for manufacturing the compressor described in Patent Document 1, first tube expansion forming is performed before the bottom section is joined to the body section, and second tube expansion forming is performed after the bottom section is joined to the body section. By performing the first tube expansion forming, a first inner surface, a second inner surface, and a third inner surface are formed on the body section. The inner diameter of the second inner surface is smaller than the inner diameter of the first inner surface, and the third inner surface is formed between the first inner surface and the second inner surface. In this manufacturing method, by performing the second tube expansion forming, the second inner surface and the third inner surface are expanded and formed to the inner diameter of the first inner surface.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] For example, when an accumulator support base or the like is welded to the body section after tube expansion forming, the body section is deformed by the heat input during welding, and the inner diameter of the body section becomes non-uniform. When the inner diameter of the body section is deformed, the gap between the rotor and the stator arranged inside the body section becomes non-uniform, which causes noise and vibration.

[0006] The present disclosure aims to provide a method for manufacturing a compressor that can mitigate the non-uniformity of the inner diameter of the cylindrical body. [Means for solving the problem]

[0007] A method for manufacturing a compressor according to one aspect of the present disclosure comprises a cylindrical body housing a compression mechanism and a motor section, an accessory support portion welded to the outer surface of the cylindrical body, and an accessory supported by the accessory support portion, and includes a step of expanding the cylindrical body so that the inner diameter of a portion of the cylindrical body corresponding to a first region is larger than the average inner diameter of the cylindrical body, and a step of welding the accessory support portion to the outer surface of the cylindrical body corresponding to the first region, which is performed after the step of expanding the cylindrical body.

[0008] In the compressor manufacturing method of this embodiment, the inner diameter of the portion corresponding to the first region of the cylindrical body can be made larger than the average inner diameter of the cylindrical body. In this manufacturing method, by welding an accessory support portion to the portion corresponding to the first region, the non-uniformity of the inner diameter of the cylindrical body is mitigated after the first region is strained and contracted due to the heat input of welding.

[0009] In a method for manufacturing a compressor according to one aspect of the present disclosure, the step of expanding a cylindrical body is to expand the cylindrical body such that the inner diameter of the portion corresponding to the second region, which is outside the first region in the circumferential direction of the cylindrical body, becomes smaller than the average inner diameter. The outside of the first region may be in a direction away from the first region. Expanding the cylindrical body so that the inner diameter becomes smaller than the average inner diameter may also mean that the second region becomes smaller than the average inner diameter by expanding the first region.

[0010] In a method for manufacturing a compressor according to one aspect of the present disclosure, the first region is a region in the axial direction of the cylindrical body that is closer to the portion of the cylindrical body that houses the motor unit than to the portion of the cylindrical body that houses the compression mechanism. This makes it possible to mitigate the non-uniformity of the inner diameter in the portion close to the motor unit, rather than in the portion far from the motor unit. As a result, it is possible to mitigate the non-uniformity of the gap between the rotor and stator of the motor unit, and reduce noise and vibration during the operation of the motor unit.

[0011] In a method for manufacturing a compressor according to one aspect of the present disclosure, in the step of expanding a cylindrical body, an expansion jig is inserted into the inside of the cylindrical body, and an extrusion rod is inserted into the expansion jig, thereby pushing out the portion of the expansion jig in the radial direction of the cylindrical body and expanding the cylindrical body. The range in which the inner diameter is expanded in the circumferential direction of the cylindrical body to increase may be less than twice the angular range to which the accessory support is attached. By expanding the inner diameter in a range greater than the angular range to which the accessory support is attached to ensure that it increases, the non-uniformity of the inner diameter of the cylindrical body is mitigated.

[0012] In a method for manufacturing a compressor according to one aspect of the present disclosure, the tube expansion jig includes a plurality of tube expansion bodies that are divided in the circumferential direction and have an outer surface that is pressed against the inner surface of a cylindrical body. By inserting an extrusion rod into the center of the tube expansion jig, the plurality of tube expansion bodies are pushed out radially, and the outer surfaces of the plurality of tube expansion bodies are pressed against the inner surface of the opposing cylindrical body. Of the plurality of tube expansion bodies, the outer surface of the first tube expansion body that faces the first region protrudes outward in the radial direction of the tube expansion jig more than the outer surface of the second tube expansion body adjacent to the first tube expansion body in the circumferential direction of the tube expansion jig. By inserting such a tube expansion jig into the inside of a cylindrical body and expanding the cylindrical body, the inner diameter of the portion of the cylindrical body corresponding to the first region can be made larger than the inner diameter of the portions adjacent in the circumferential direction. [Brief explanation of the drawing]

[0013] [Figure 1] This is a side view showing a compressor according to an embodiment. [Figure 2]This is a cross-sectional view showing the casing and support member of a compressor according to an embodiment. [Figure 3] This is a process diagram showing the manufacturing method of the compressor according to the embodiment. [Figure 4] This is a perspective view showing a pipe expansion jig. [Figure 5] This is a plan view showing a pipe expansion jig. [Figure 6] This is a cross-sectional view showing the inner diameter of a cylindrical body. [Modes for carrying out the invention]

[0014] Non-limiting embodiments of this disclosure will be described with reference to the attached drawings. In the attached drawings, identical or corresponding members or parts are denoted by the same or corresponding reference numerals. Furthermore, redundant descriptions of identical or corresponding members or parts will be omitted below. Also, the members or parts in the drawings are not necessarily drawn to scale. Therefore, those skilled in the art can arbitrarily determine specific dimensions by referring to the non-limiting embodiments below. Furthermore, the embodiments below are illustrative and not limiting to the invention. Also, the features and combinations thereof described in the embodiments are not necessarily essential to the invention.

[0015] [Compressor 100] Before describing the manufacturing method of the compressor 100, the compressor 100 itself will be described. Figure 1 is a side view showing the compressor 100 according to an embodiment. Figure 2 is a cross-sectional view showing the casing 30 and support member 40 of the compressor 100 according to an embodiment.

[0016] The compressor 100 is used to compress the low-pressure refrigerant in the refrigeration cycle to a high-pressure state, and comprises a compressor body 101, a cylindrical accumulator 50, and a support member 40 fixed to the compressor body 101 to support the accumulator 50 in an upright position.

[0017] The compressor main body 101 has a vertical cylindrical casing 30. The casing 30 houses the compression mechanism 10 and the motor unit 20. The casing 30 may be a fully sealed type. The casing 30 has a cylindrical body 31, a top 32, and a bottom 33. The cylindrical body 31 includes a first portion 37 that houses the compression mechanism 10 and a second portion 38 that houses the motor unit 20. The second portion 38 that houses the motor unit 20 is disposed above the first portion 37 that houses the compression mechanism 10.

[0018] The bottom 33 is the bottom plate on the lower side of the casing 30 and covers the opening on the lower side of the cylindrical body 31. The top 32 is the top plate on the upper side of the casing 30 and covers the opening on the upper side of the cylindrical body 31. The bottom 33 is welded to the lower end of the cylindrical body 31, and the top 32 is welded to the upper end of the cylindrical body 31.

[0019] An intake port 113 extending radially outward is provided at the lower part of the side surface of the casing 30. The intake port 113 communicates with the compression mechanism 10. A discharge pipe 114 is connected to the upper part of the casing 30. The discharge pipe 114 extends upward from the top 32.

[0020] The accumulator 50 is a vertical cylindrical container for performing gas-liquid separation of the low-pressure refrigerant and refrigeration oil sucked into the compressor main body 101 and temporarily storing them. The central axis C12 of the accumulator 50 may be parallel to the central axis C11 of the casing 30. The accumulator 50 is fixed to the outer peripheral surface of the casing 30 by the support member 40 and the fastening band 140. An outlet pipe 121 is provided at the lower end of the accumulator 50. The outlet pipe 121 extends downward from the lower end of the accumulator 50. The outlet pipe 21 is bent toward the intake port 113 of the compressor main body 101 and connected to the intake port 113. An annular rubber buffer member 122 is wound around the outer peripheral surface of the cylindrical portion of the accumulator 50.

[0021] The support member 40 is a metal plate-like member welded to the side surface of the compressor main body 101, that is, the outer peripheral surface 31a of the cylindrical body 31 of the casing 30.

[0022] As shown in FIG. 2, the support member 40 includes a fixing portion 41 fixed to the casing 30 of the compressor body 101, and a first support portion 42 and a second support portion 43 that are arranged apart from each other in the circumferential direction of the casing 30 and project radially outward from both ends of the fixing portion 41. These fixing portion 41, first support portion 42, and second support portion 43 are integrally formed by pressing a single plate material.

[0023] The fixing portion 41 is a plate-like portion extending along the outer peripheral surface 31a of the cylindrical body 31 of the casing 30 and is welded to the cylindrical body 31 of the casing 30. The range of the angle θ11 at which the support member 40 is attached to the cylindrical body 31 may be the range where the fixing portion 41 and the cylindrical body 31 are in contact.

[0024] The first support portion 42 has a first extending portion 42a extending from one end of the fixing portion 41 toward the accumulator 50 in a plan view, and a first flange portion 42b folded back from the tip of the first extending portion 42a toward the compressor body 101 side.

[0025] The second support portion 43 has a second extending portion 43a extending from the other end of the fixing portion 41 toward the accumulator 50 in a plan view, and a second flange portion 43b folded back from the tip of the second extending portion 43a toward the compressor body 101.

[0026] [First Region 34 and Second Region 35 of Cylindrical Body 31] The cylindrical body 31 includes a first region 34 and a second region 35. The first region 34 includes a region where the fixing portion 41 of the support member 40 is welded in the circumferential direction of the cylindrical body 31. The second region 35 is a region adjacent to the first region 34 in the circumferential direction of the cylindrical body 31. In the circumferential direction, the second region 35 is formed on both sides of the first region 34.

[0027] The first region 34 includes the area where the fixing portion 41 of the support member 40 is welded and shrinks. The first region 34 also includes the area where it cools and shrinks after welding. The second region 35 includes the area where it is pulled and deformed by the first region 34 due to the shrinkage of the first region 34. The second region 35 also includes the area where it cools after welding the fixing portion 41 and deforms in a direction that increases the inner diameter of the cylindrical body 31.

[0028] The cylindrical body 31 includes a third region 36 that is not included in the first region 34 and the second region 35. The third region 36 includes the region outside the second region 35 in the circumferential direction. The third region 36 includes the region further away from the first region 34 than the second region 35. The third region 36 may also be a region that is not affected by deformation due to welding of the fixing part 41.

[0029] The first region 34, the second region 35, and the third region 36 are formed in the first portion 37 in the axial direction of the cylindrical body 31. The axial direction of the cylindrical body 31 is the direction in which the central axis C11 extends. The first portion 37 of the cylindrical body 31 includes the first region 34, the second region 35, and the third region 36.

[0030] [Inner diameter of cylindrical body 31] Figure 6 is a cross-sectional view showing the inner diameter of the cylindrical body 31. In Figure 6, a cross-section perpendicular to the central axis C11 of the cylindrical body 31 is shown. The inner diameter of point P10 on the inner circumferential surface of the cylindrical body 31 may be the maximum value of the distance between point P10 and the other points P11 to P13. Points P10 to P13 shown in Figure 6 are illustrative points used to explain the inner diameter and may be points included in any of the first region 34, second region 35, and third region 36 described above.

[0031] [Manufacturing method for compressor 100] Next, the manufacturing method of the compressor 100 will be described. Figure 3 is a process diagram showing the manufacturing method of the compressor 100 according to the embodiment. The manufacturing method of the compressor 100 includes the steps of expanding the cylindrical body 31 (step S11) and welding the support member 40 to the cylindrical body 31 (step S12).

[0032] In the process of expanding the cylindrical body 31, the cylindrical body 31 is expanded so that the inner diameter R11 of the portion of the cylindrical body 31 corresponding to the first region 34 is larger than the average inner diameter R10 of the cylindrical body 31. The first region 34 includes the region to which the support member 40 is welded. The average inner diameter R10 of the cylindrical body 31 may be the average value of the inner diameter of the cylindrical body 31 before the process of expanding the cylindrical body 31 is performed and before the support member 40 is welded. The average value of the inner diameter of the cylindrical body 31 is the average value of the inner diameter at multiple points on the inner circumferential surface.

[0033] In the process of expanding the cylindrical body 31, the cylindrical body 31 is expanded such that the inner diameter of the portion corresponding to the second region 35 becomes smaller than the average inner diameter.

[0034] Figure 4 is a perspective view showing the pipe expansion jig 200. Figure 5 is a plan view showing the pipe expansion jig 200. In the process of expanding the cylindrical body 31, the pipe expansion jig 200 can be inserted into the inside of the cylindrical body 31 to expand it. The pipe expansion jig 200 is, for example, cylindrical in shape. The pipe expansion jig 200 has an outer surface that is pressed against the inner surface of the cylindrical body 31.

[0035] The pipe expansion jig 200 has a plurality of pipe expansion bodies 201 to 203 that are divided in the circumferential direction. The pipe expansion bodies 201 to 203 are movable in the radial direction. The outer surfaces of the plurality of pipe expansion bodies 201 to 203 come into contact with the inner surface 31b of the cylindrical body 31, thereby expanding the cylindrical body 31. Pipe expansion body 201 is an example of a first pipe expansion body, and pipe expansion body 202 is an example of a second pipe expansion body.

[0036] The tube expansion jig 200 is divided into, for example, eight sections in the circumferential direction. The tube expansion jig 200 may comprise one tube expansion body 201, two tube expansion bodies 202, and five tube expansion bodies 203. The tube expansion body 201 abuts against a first region 34 of the cylindrical body 31. The tube expansion body 202 abuts against a second region 35 of the cylindrical body 31. The tube expansion body 203 abuts against a third region 36 of the cylindrical body 31. The tube expansion bodies 202 are arranged adjacent to the tube expansion body 201 in the circumferential direction. Two tube expansion bodies 202 are arranged on both sides of the tube expansion body 201. The tube expansion bodies 203 are arranged on the opposite side of the tube expansion body 202 in the circumferential direction from the tube expansion body 201.

[0037] The outer surface of the expanded tube 201 protrudes outward in the radial direction of the expanding jig 200 than the outer surface of the expanded tube 202. The outer surface of the expanded tube 202 may be positioned inward in the radial direction of the expanding jig 200 than the outer surface of the expanded tube 203. The radial length L201 of the expanded tube 201 is longer than the radial length L202 of the expanded tube 202. The radial length L202 of the expanded tube 202 is shorter than the radial length L203 of the expanded tube 203.

[0038] In Figure 5, the arc 208 along the circumference of the reference circle is shown by a dashed line. The reference circle corresponds to the inner circumferential surface 31b of the cylindrical body 31 before processing. The outer circumferential surface of the expanded tube 201 is located radially outside the arc 208. Of the outer circumferential surface of the expanded tube 202, the portion closest to the expanded tube 201 may be located radially outside the arc 208. The majority of the outer circumferential surface of the expanded tube 202 is located radially inside the arc 208. The outer circumferential surface of the expanded tube 203 may be located at the same position as the arc 208.

[0039] By inserting the extrusion rod 205 into the center of the tube expansion jig 200, multiple expanded tubes 201 to 203 are extruded radially. The extrusion rod 205 is cylindrical in shape. In the process of expanding the cylindrical body 31, the tube expansion jig 200 is inserted into the inside of the cylindrical body 31, and the extrusion rod 205 is inserted into the inside of the tube expansion jig 200, so that the expanded tubes 201 to 203 come into contact with the inner circumferential surface of the expanded tube 201. The expanded tube 201 pushes the first region 34 of the cylindrical body 31 radially outward. The second region 35 comes into contact with the outer circumferential surface of the expanded tube 202 and deforms. The second region 35 may deform so as to be concave radially inward in accordance with the deformation of the first region 34. The third region 36 comes into contact with the outer circumferential surface of the expanded tube 203 and maintains its shape.

[0040] After the process of expanding the cylindrical body 31 is performed, the process of welding the support member 40 to the cylindrical body 31 is performed. Here, the fixing portion 41 of the support member 40 is welded to the outer circumferential surface of the first region 34 of the cylindrical body 31. After welding the fixing portion 41, the cylindrical body 31 deforms. At this time, the first region 34 of the cylindrical body 31 shrinks so that its inner diameter becomes smaller, but because it has been expanded in advance so that its inner diameter becomes larger, the non-uniformity of the inner diameter of the cylindrical body 31 is mitigated. For example, after the fixing portion 41 is welded and cooled, the inner diameter of the cylindrical body 31 becomes approximately the same at circumferential positions. The second region 35 deforms so that its inner diameter becomes larger. The inner diameters of the first region 34, the second region 35, and the third region 36 become approximately the same.

[0041] In the manufacturing method of the compressor 100, after welding the support member 40 to the cylindrical body 31, the compression mechanism 10 and motor unit 20 are housed in the cylindrical body 31, and the top 32 and bottom 33 are welded to the cylindrical body 31. Subsequently, the accumulator 50 is attached to the support member 40, and the outlet pipe 121 is connected to the intake port 113.

[0042] [Effects and Effects of the Manufacturing Method of Compressor 100] A method for manufacturing a compressor 100 according to an embodiment is a method for manufacturing a compressor 100 comprising a cylindrical body 31 housing a compression mechanism 10 and a motor unit 20, a support member (accessory support part) 40 welded to the outer circumferential surface 31a of the cylindrical body 31, and an accumulator (accessory) 50 supported by the support member 40, the method comprising: a step of expanding the cylindrical body 31 so that the inner diameter R11 of the portion of the cylindrical body 31 corresponding to a first region 34 is larger than the average inner diameter R10 of the cylindrical body 31; and a step performed after the step of expanding the cylindrical body 31, in which the support member 40 is welded to the outer circumferential surface of the cylindrical body 31 corresponding to the first region 34.

[0043] In the manufacturing method of the compressor 100 according to this embodiment, the inner diameter R11 of the portion of the cylindrical body 31 corresponding to the first region 34 can be made larger than the average inner diameter R10 of the cylindrical body 31. In this manufacturing method, by welding the fixing portion 41 of the support member 40 to the portion corresponding to the first region 34, the non-uniformity of the inner diameter of the cylindrical body 31 is mitigated after the first region is strained and contracted due to the heat input of welding. By expanding the pipe so that the first region 34 is larger than the average inner diameter, taking into account the contraction due to the heat input of welding, the non-uniformity of the inner diameter of the cylindrical body 31 is mitigated. The "average inner diameter" may also be the average inner diameter of the cylindrical body 31 after expansion.

[0044] Furthermore, in the manufacturing method of the compressor 100 according to this embodiment, the step of expanding the cylindrical body 31 may be performed such that the inner diameter R12 of the portion of the cylindrical body 31 corresponding to the second region 35, which is outside the first region 34 in the circumferential direction of the cylindrical body 31, becomes smaller than the average inner diameter R10. Expanding the cylindrical body 31 to be smaller than the average inner diameter may also be done by expanding the first region 34 so that the second region 35 becomes smaller than the average inner diameter. By expanding the cylindrical body 31 in this way, the non-uniformity of the inner diameter of the cylindrical body 31 after welding is mitigated.

[0045] Furthermore, in the manufacturing method of the compressor 100 according to this embodiment, the first region 34 is a region in the axial direction of the cylindrical body 31 that is closer to the second portion 38 of the cylindrical body 31 in which the motor unit 20 is housed than to the first portion 37 of the cylindrical body 31 in which the compression mechanism 10 is housed. The "region close to the second portion 38" here may also include the region including the second portion 38. The first region 34 is formed in the second portion 38. The fixing portion 41 is welded to the outer circumferential surface of the first region 34 included in the second portion 38. According to this embodiment, the non-uniformity of the inner diameter of the second portion 38, which is close to the motor unit 20, rather than the first portion 37 which is far from the motor unit 20, can be mitigated. Therefore, the non-uniformity of the gap between the rotor and stator of the motor unit 20 can be mitigated, and noise and vibration during the operation of the motor unit 20 can be reduced. The stator is fixed to the inner circumferential surface 31b of the second portion 38.

[0046] Furthermore, in the manufacturing method of the compressor 100 according to this embodiment, in the step of expanding the cylindrical body 31, the expansion jig 200 is inserted into the inside of the cylindrical body 31, and the push rod 205 is inserted into the inside of the expansion jig 200, thereby pushing out the portion of the expansion jig 200 in the radial direction of the cylindrical body 31 and expanding the cylindrical body 31. The range in which the inner diameter is expanded in the circumferential direction of the cylindrical body 31 to increase may be less than twice the range of angle θ11 to which the support member 40 is attached. This ensures that the inner diameter in a range greater than the range of angle θ11 to which the support member 40 is attached is reliably expanded to increase its size. As a result, the non-uniformity of the inner diameter of the cylindrical body 31 is mitigated. The range in which the inner diameter is expanded in the circumferential direction of the cylindrical body 31 to increase may be one or more times the range of angle θ11 to which the support member 40 is attached.

[0047] Furthermore, in the manufacturing method of the compressor 100 according to this embodiment, the pipe expansion jig 200 has an outer surface 200a that is pressed against the inner surface 31b of the cylindrical body 31 and includes a plurality of pipe expansion bodies 201 to 203 that are divided in the circumferential direction. By inserting an extrusion rod 205 into the center position of the pipe expansion jig 200, the plurality of pipe expansion bodies 201 to 203 are pushed out in the radial direction, and the outer surfaces of the plurality of pipe expansion bodies 201 to 203 are pressed against the inner surface 31b of the opposing cylindrical body 31. Of the plurality of pipe expansion bodies 201 to 203, the outer surface of the pipe expansion body (first pipe expansion body) 201 that is facing the first region 34 protrudes outward in the radial direction of the pipe expansion jig 200 than the outer surface of the pipe expansion body (second pipe expansion body) 202 that is adjacent to the pipe expansion body 201 in the circumferential direction of the pipe expansion jig 200. According to this manufacturing method, the expanded tube 201 pushes out the first region 34, making the inner diameter of the first region 34 larger than the inner diameter of the second region 35.

[0048] Preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described above. Various modifications, substitutions, etc., can be applied to the embodiments described above without departing from the scope of the present invention. Furthermore, features described separately can be combined as long as no technical inconsistencies arise.

[0049] In the above embodiment, an example is given of attaching an accumulator 50 to the cylindrical body 31 as an accessory, but the accessories attached to the cylindrical body 31 are not limited to the accumulator 50. For example, the method of manufacturing a compressor according to this disclosure may be applied when attaching other accessories such as piping or soundproofing members to the cylindrical body 31.

[0050] In the above embodiment, the case in which the fixing portion 41 is welded to the outer circumferential surface 31a of the cylindrical body 31 is described, but the fixing portion 41 may be fixed to the accumulator 50 and the first support portion 42 and the second support portion 43 may be welded to the cylindrical body 31.

[0051] The compressor 100 may be, for example, a rotary compressor. A rotary compressor is a compressor that compresses the gas in a compression chamber formed inside a cylinder by eccentrically rotating a roller inside the cylinder. Rotary compressors generally have vanes to partition the compression chamber. Rotary compressors include the so-called rolling piston type in which a vane separate from the roller contacts the roller while the roller rotates eccentrically, the so-called swing type in which a vane formed integrally with the roller swings along with the eccentric rotation of the roller, and the so-called hinge vane type in which the tip of the vane is rotatably fitted into a recess on the outer surface of the roller while the roller rotates eccentrically. The compressor 100 may be any other type of compressor, for example, a scroll compressor.

[0052] One aspect of the present invention may be as follows:

[0053] <1> A method for manufacturing a compressor (100) comprising a cylindrical body (31) housing a compression mechanism (10) and a motor unit (20), an accessory support part (40) welded to the outer circumferential surface (31a) of the cylindrical body, and an accessory (50) supported by the accessory support part, A step of expanding the cylindrical body such that the inner diameter (R11) of the portion corresponding to the first region (34) of the cylindrical body becomes larger than the average inner diameter (R10) of the cylindrical body, A step performed after the step of expanding the cylindrical body, comprising welding the accessory support portion to the outer circumferential surface of the cylindrical body corresponding to the first region, A method for manufacturing a compressor, including the following: <2> The process of expanding the cylindrical body involves expanding the cylindrical body such that the inner diameter of the portion corresponding to the second region (35), which is outside the first region in the circumferential direction of the cylindrical body, becomes smaller than the average inner diameter. <1> A method for manufacturing the compressor described above. <3> The first region is a region in the axial direction of the cylindrical body that is closer to the portion of the cylindrical body in which the motor is housed than to the portion of the cylindrical body in which the compression mechanism is housed. <1> or <2> A method for manufacturing the compressor described above. <4> In the process of expanding the cylindrical body, an expansion jig (200) is inserted into the inside of the cylindrical body, and an extrusion rod (205) is inserted into the inside of the expansion jig, thereby pushing the portion of the expansion jig in the radial direction of the cylindrical body and expanding the cylindrical body. In the circumferential direction of the cylindrical body, the range in which the inner diameter is expanded is less than twice the angular range in which the accessory support is attached. <1> ~ <3> A method for manufacturing a compressor as described in any one of the following. <5> The tube expansion jig includes a plurality of circumferentially divided tube expansion bodies (201-203), each having an outer surface that is pressed against the inner surface of the cylindrical body. By inserting the extrusion rod into the center of the tube expansion jig, the plurality of tube expansion bodies are extruded radially, so that the outer surfaces of the plurality of tube expansion bodies are pressed against the opposing inner surfaces of the cylindrical body. Of the plurality of expanded tubes, the outer circumferential surface of the first expanded tube (201) facing the first region protrudes outward in the radial direction of the expanded tube jig more than the outer circumferential surface of the second expanded tube (202) adjacent to the first expanded tube in the circumferential direction of the expanded tube jig. <4> A method for manufacturing the compressor described above. [Explanation of Symbols]

[0054] 100 Compressors 10 Compression mechanism 20 Motor section 30 Casing 31 Cylindrical body 31a Outer surface 34 First area 35 Second area 37. Part 1 (the cylindrical part housing the compression mechanism) 38. Second part (the cylindrical part that houses the motor) 40. Support member (accessory support part) 41 Fixed part 50 Accumulator (accessory) 200 Pipe expansion jig 201 Expanded pipe (First expanded pipe) 202 Expanded pipe (2nd expanded pipe) 203 Expanded tube 205 Pushing rod

Claims

1. A method for manufacturing a compressor (100) comprising a cylindrical body (31) housing a compression mechanism (10) and a motor unit (20), an accessory support part (40) welded to the outer circumferential surface (31a) of the cylindrical body, and an accessory (50) supported by the accessory support part, A step of expanding the cylindrical body such that the inner diameter (R11) of the portion corresponding to the first region (34) of the cylindrical body becomes larger than the average inner diameter (R10) of the cylindrical body, A step performed after the step of expanding the cylindrical body, comprising welding the accessory support portion to the outer circumferential surface of the cylindrical body corresponding to the first region, A method for manufacturing a compressor, including the following:

2. The method for manufacturing a compressor according to claim 1, wherein the step of expanding the cylindrical body is to expand the cylindrical body such that the inner diameter of the portion of the cylindrical body corresponding to the second region (35) which is outside the first region in the circumferential direction becomes smaller than the average inner diameter.

3. The method for manufacturing a compressor according to claim 1 or 2, wherein the first region is a region in the axial direction of the cylindrical body that is closer to the portion of the cylindrical body in which the motor portion is housed than to the portion of the cylindrical body in which the compression mechanism is housed.

4. In the process of expanding the cylindrical body, an expansion jig (200) is inserted into the inside of the cylindrical body, and an extrusion rod (205) is inserted into the inside of the expansion jig, thereby pushing the portion of the expansion jig radially outwards from the cylindrical body and expanding the cylindrical body. The method for manufacturing a compressor according to claim 1 or 2, wherein the range in the circumferential direction of the cylindrical body in which the inner diameter is expanded is less than twice the angular range to which the accessory support is attached.

5. The tube expansion jig includes a plurality of circumferentially divided tube expansion bodies (201-203), each having an outer surface that is pressed against the inner surface of the cylindrical body. By inserting the extrusion rod into the center of the tube expansion jig, the plurality of tube expansion bodies are extruded radially, so that the outer surfaces of the plurality of tube expansion bodies are pressed against the inner surfaces of the opposing cylindrical body. The method for manufacturing a compressor according to claim 4, wherein, among the plurality of expanded tubes, the outer circumferential surface of the first expanded tube (201) facing the first region protrudes outward in the radial direction of the expanded tube jig more than the outer circumferential surface of the second expanded tube (202) adjacent to the first expanded tube in the circumferential direction of the expanded tube jig.

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