CN113597359B

CN113597359B - Method for manufacturing compressor

Info

Publication number: CN113597359B
Application number: CN201980094347.8A
Authority: CN
Inventors: 清水聪大; 山口大贵
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2023-07-07
Anticipated expiration: 2039-03-29
Also published as: JPWO2020202296A1; WO2020202296A1; JP7154389B2; CN113597359A

Abstract

The present invention relates to a method for manufacturing a compressor, wherein a weld bead crushing clamp is provided with: a fixed receiving die which is formed in a columnar shape and has a side wall portion formed by a curved surface of an arc shape protruding outward, and which is arranged to be inserted into a hollow portion of a rolled steel pipe formed in a cylindrical shape so that the side wall portion is opposed to a weld bead formed to protrude from an inner peripheral surface of the rolled steel pipe; and a movable roller pressing die which is a rotating body having a peripheral wall surface portion formed to be recessed in an arc shape in a central portion in an axial direction of the rotating shaft, and which is disposed so that the peripheral wall surface portion faces the side wall portion with the rolled steel pipe interposed therebetween, and the peripheral wall surface portion presses the rolled steel pipe, rotates, and moves in a direction in which the rolled steel pipe extends.

Description

Method for manufacturing compressor

Technical Field

The present invention relates to a bead crushing jig for crushing a bead and a method for manufacturing a compressor using the bead crushing jig.

Background

As a conventional compressor including a pressure-tight container in which a main body, a bottom portion, and a cover portion are joined by welding, there is disclosed a compressor in which a seam of circumferentially opposed edge portions is joined by butt welding to a main body formed in a cylindrical shape (for example, refer to patent document 1).

Patent document 1: japanese patent laid-open No. 2009-115015

The compressor of patent document 1 has a bead formed to protrude from an inner peripheral surface of a main body, and the bead in a portion protruding from the inner peripheral surface is removed by so-called scraping processing. However, the removal of the weld bead by the cutting process on the curved surface may not stably form the shape of the weld bead conforming to the inner diameter shape of the body portion, and may cause trouble in chip disposal.

Disclosure of Invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a bead crushing jig capable of stably forming a bead in a portion protruding from an inner peripheral surface into a shape conforming to an inner diameter shape of a body portion, and capable of crushing the bead without causing trouble of chip disposal, and a method for manufacturing a compressor using the bead crushing jig.

The welding bead crushing clamp of the invention comprises: a fixed receiving die which is formed in a columnar shape and has a side wall portion formed by a curved surface of an arc shape protruding outward, and which is arranged to be inserted into a hollow portion of a rolled steel pipe formed in a cylindrical shape so that the side wall portion is opposed to a weld bead formed to protrude from an inner peripheral surface of the rolled steel pipe; and a movable roller pressing die which is a rotating body having a peripheral wall surface portion formed to be recessed in an arc shape in a central portion in an axial direction of the rotating shaft, and which is disposed so that the peripheral wall surface portion faces the side wall portion with the rolled steel pipe interposed therebetween, the peripheral wall surface portion pressing the rolled steel pipe while rotating and moving in a direction in which the rolled steel pipe extends.

The method for manufacturing a compressor according to the present invention includes: winding, namely forming a rectangular steel plate serving as a main body part of the pressure closed container into a coil shape; shrink tube processing, namely forming a rolled steel plate into a cylindrical shape; butt welding, in which opposing edge portions of a steel plate molded into a cylindrical shape are joined by welding; a weld bead crushing process of crushing a weld bead formed to protrude from an inner peripheral surface of the welded steel pipe; and a tube expanding process of pressing from the inner peripheral surface side of the steel tube to reduce deformation of the steel tube, wherein for the bead crushing process, a fixed receiving die formed in a columnar shape and having a side wall portion formed by a curved surface of an arc shape protruding outward is inserted into a hollow portion of the steel tube formed in a cylindrical shape and arranged so that the side wall portion faces a bead formed to protrude from the inner peripheral surface of the steel tube, and a movable roller pressing die as a rotating body has a peripheral wall portion formed so that a central portion in an axial direction of the rotating shaft is recessed in an arc shape and arranged so that the peripheral wall portion faces the side wall portion via the steel tube, and the peripheral wall portion presses the steel tube and rotates while moving in a direction in which the steel tube extends.

According to the present invention, the side wall portion of the fixed receiving die is disposed so as to face the bead formed so as to protrude from the inner peripheral surface of the rolled steel pipe, and the peripheral wall portion of the movable roller pressing die is disposed so as to face the side wall portion with the rolled steel pipe interposed therebetween, and the peripheral wall portion presses the rolled steel pipe and moves in the direction in which the rolled steel pipe extends while rotating. Therefore, the bead protruding from the inner peripheral surface is sandwiched between the peripheral wall surface portion and the side wall portion, and is pressed along the inner diameter shape of the rolled steel pipe and along the direction in which the rolled steel pipe extends. Therefore, it is possible to provide a bead crushing jig and a compressor manufacturing method that can stably form a bead in a portion protruding from the inner peripheral surface into a shape conforming to the inner diameter shape of the body portion, and that do not cause trouble in chip disposal.

Drawings

Fig. 1 is a longitudinal sectional view schematically showing an example of a compressor according to the present embodiment.

Fig. 2 is a schematic view of a section A-A of fig. 1 showing an example of the internal structure of the compression mechanism of the compressor according to the present embodiment.

Fig. 3 is a flowchart showing a processing procedure of a method of manufacturing a main body portion constituting a pressure-tight container.

Fig. 4 is a perspective view schematically showing the appearance of a steel sheet before molding, which is used in the manufacturing process of the body portion of the pressure-tight container in the manufacturing process of the compressor of the present embodiment.

Fig. 5 is a schematic view showing a structure of a steel sheet before winding and a structure of a part of a roll device in the manufacturing process of the compressor of the present embodiment.

Fig. 6 is a schematic view showing a structure of a steel sheet at the start of winding and a structure of a part of a roll device in the manufacturing process of the compressor of the present embodiment.

Fig. 7 is a schematic view showing a structure of a steel sheet during winding and a structure of a part of a roll device in the manufacturing process of the compressor of the present embodiment.

Fig. 8 is a schematic view showing a structure of a steel sheet at the end of winding and a structure of a part of a roll device in the manufacturing process of the compressor of the present embodiment.

Fig. 9 is a schematic view showing a structure of a steel plate and a part of the pipe reducing device at the start of pipe reducing in the manufacturing process of the compressor according to the present embodiment.

Fig. 10 is a schematic view showing a structure of a steel plate and a pipe reducing device during pipe reducing in the manufacturing process of the compressor according to the present embodiment.

Fig. 11 is a schematic view showing a structure of a steel plate and a part of a butt welding apparatus during butt welding in the manufacturing process of the compressor of the present embodiment.

Fig. 12 is a schematic view of a cross section of a rolled steel pipe formed by subjecting a steel plate to a rolling process, a shrinking process, and a butt welding process.

Fig. 13 is a schematic plan view showing a structure of a part of the bead crushing jig at the time of the bead crushing process in the manufacturing process of the compressor of the present embodiment.

Fig. 14 is a schematic plan view showing a structure of a part of the bead crushing jig at the time of the bead crushing process in the manufacturing process of the compressor of the present embodiment.

Fig. 15 is a simplified top view of a bead crushing jig and rolled steel pipe prior to bead crushing.

Fig. 16 is a simplified side view of a bead crushing jig before bead crushing processing and a rolled steel pipe.

Fig. 17 is a simplified plan view of the bead crushing jig at the time of bead crushing processing and rolled steel pipe.

Fig. 18 is a simplified side view of a bead crushing jig and a rolled steel pipe at the time of bead crushing processing.

Fig. 19 is a schematic view showing a cross-sectional structure of a rolled steel pipe and a cross-sectional structure of a part of a pipe expanding jig before a pipe expanding process is performed in the manufacturing process of the compressor according to the present embodiment.

Fig. 20 is a schematic view showing a cross-sectional structure of a rolled steel pipe and a cross-sectional structure of a part of a pipe expanding jig at the time of one pipe expanding process in the manufacturing process of the compressor of the present embodiment.

Fig. 21 is a diagram showing the shape of the main body of the comparative example after the pipe expansion process.

Fig. 22 is a schematic view of a movable roller pressing die of the bead crushing jig.

Fig. 23 is a schematic view of a fixing and receiving die of the bead crushing jig.

Fig. 24 is a schematic view showing the cross-sectional shapes of a rolled steel pipe before the weld bead crushing process and a rolled steel pipe of a comparative example after the secondary pipe expansion process.

Fig. 25 is a schematic view of a bead crushing jig based on the structure of the first comparative example.

Fig. 26 is a schematic cross-sectional view of a rolled steel pipe after weld bead crushing processing by a weld bead crushing jig of the structure of the first comparative example and subsequent pipe expansion processing.

Fig. 27 is a schematic view of a bead crushing jig based on the structure of the second comparative example.

Fig. 28 is a schematic cross-sectional view of a rolled steel pipe after weld bead crushing processing by a weld bead crushing jig of a structure according to a second comparative example, and subsequent pipe expansion processing.

Fig. 29 is a schematic view of a bead crushing jig based on the structure of the third comparative example.

Fig. 30 is a schematic cross-sectional view of a rolled steel pipe after weld bead crushing processing by a weld bead crushing jig of a structure according to a third comparative example and subsequent pipe expansion processing.

Fig. 31 is a diagram summarizing the relationship between the circular arc shape of the fixed receiving die and the movable roller pressing die and the outer and inner peripheral surfaces of the rolled steel pipe and the rolled steel pipe of the comparative example.

Fig. 32 is a schematic view of a weld bead crushing jig based on the structure of the fourth comparative example.

Fig. 33 is a schematic cross-sectional view of a rolled steel pipe after weld bead crushing processing by a weld bead crushing jig of a structure according to a fourth comparative example and subsequent pipe expansion processing.

Fig. 34 is a schematic view of a bead crushing jig based on the structure of the fifth comparative example.

Fig. 35 is a schematic view of a bead crushing jig based on the structure of the sixth comparative example.

Fig. 36 is a schematic cross-sectional view of a rolled steel pipe after weld bead crushing processing by a weld bead crushing jig of a structure according to a sixth comparative example, and subsequent pipe expansion processing.

Fig. 37 is a diagram summarizing the relationship between the width Wu of the fixed receiving die and the width Wr of the movable roller pressing die, and the width Ww of the range of the rolled steel pipe, which is thermally cured by welding, and the rolling mark.

Detailed Description

Embodiments are described.

Fig. 1 is a longitudinal sectional view schematically showing an example of a compressor 1 according to the present embodiment. The structure of the compressor 1 according to the present embodiment will be described with reference to fig. 1. The compressor 1 is used in a refrigeration cycle apparatus such as an air conditioner, and is an element constituting a refrigerant circuit of the refrigeration cycle apparatus.

In the following drawings including fig. 1, the refrigerant circuit and components other than the refrigerant circuit, such as a radiator, an evaporator, a pressure reducing device, and an oil separator, are not shown. In the following drawings, the dimensional relationships and shapes of the constituent members may be different from those of actual ones. In the following drawings, the same or similar components or portions are denoted by the same reference numerals, or the same reference numerals are omitted. In the following description, the positional relationship between the constituent members of the compressor 1, for example, the positional relationship between the constituent members in the up-down relationship, is a positional relationship in a case where the compressor 1 is in a usable state in principle. In addition, although terms indicating directions (e.g., "upper", "lower", "right", "left", "front", "rear", etc.) are used as appropriate for easy understanding, these expressions are described in the above-described manner only for convenience of description, and are not limited to the arrangement and direction of the devices or components.

[ Structure of compressor 1 ]

The compressor 1 is a rotary piston type single rotary compressor, and is a fluid machine that discharges a low-pressure gas refrigerant sucked into the interior of the compressor 1 as a high-pressure gas refrigerant. The casing of the compressor 1 is constituted by an iron pressure-tight container 2 formed in a cylinder shape. The pressure-tight container 2 is composed of a hollow cylindrical main body 2a, a bottom 2b having a U-shaped vertical section, and a cover 2c having an inverted U-shaped vertical section, and the outer surfaces of the openings of the bottom 2b and the cover 2c are fixed to the inner surface of the opening of the main body 2 a. The fixed portion of the body portion 2a and the bottom portion 2b and the fixed portion of the body portion 2a and the lid portion 2c are joined by arc welding, resistance welding, or the like, for example. The method for manufacturing the cylindrical body constituting the main body 2a of the compressor 1 will be described in detail later.

A casing 3a of the suction muffler 3 is disposed outside the main body 2a of the pressure-tight container 2. In the following drawings including fig. 1, although not shown, a housing 3a of the suction muffler 3 is fixed to a main body 2a of the pressure-tight container 2 via a support member disposed on an outer side surface of the pressure-tight container 2. An inflow pipe 3b is fixed to the top of the housing 3a of the suction muffler 3 so as to penetrate the housing 3a. The inflow pipe 3b is a refrigerant pipe for flowing low-pressure gas refrigerant or two-phase refrigerant having high dryness into the casing 3a of the suction muffler 3. One end of the suction pipe 4 is fixed to the bottom of the housing 3a of the suction muffler 3 so as to pass through the suction pipe, and the other end of the suction pipe 4 passes through the side surface portion of the main body 2a of the pressure-tight container 2 and is fixed.

The suction muffler 3 is a muffler that reduces or eliminates noise generated by the refrigerant flowing in from the inflow pipe 3b. The suction muffler 3 also has a liquid storage function, a refrigerant storage function of storing excess refrigerant, and a gas-liquid separation function of retaining liquid refrigerant temporarily generated when the operation state changes. By the gas-liquid separation function of the suction muffler 3, a large amount of liquid refrigerant can be prevented from flowing into the pressure-tight container 2, and liquid compression can be performed in the compressor 1.

The suction pipe 4 is a refrigerant pipe for sucking the low-pressure gas refrigerant from the suction muffler 3 into the pressure-tight container 2. The fixing member 6 is disposed in the suction hole 5 provided in the main body 2a of the pressure-tight container 2, and the suction pipe 4 is fixed to the main body 2a of the pressure-tight container 2 via the fixing member 6 disposed in the suction hole 5. In the following drawings including fig. 1, although not shown, the suction pipe 4 may be provided with an oil return hole in a side surface portion, so that a lubricating oil component contained in a high-pressure gas refrigerant separated in an oil separator of the refrigeration cycle apparatus is returned to the inside of the pressure-tight container 2 through the suction pipe 4.

The fixing member 6 has, for example, a connection pipe 6a and a ring 6b. One end side of the connection pipe 6a is inserted into the suction hole 5 to communicate with the inside of the pressure-tight container 2. The suction pipe 4 is inserted into the other end side of the connection pipe 6 a. The ring 6b is engaged with the suction hole 5 and engaged with the outer side surface of the connection pipe 6a and the pressure-tight container 2, thereby sealing the gap between the suction pipe 4 and the suction hole 5. The compressor 1 ensures the air tightness of the inside of the pressure-tight container 2 by the fixing member 6.

A discharge pipe 7 is fixed to the upper surface of the lid 2c of the pressure-tight container 2 so as to penetrate therethrough. The discharge pipe 7 is a refrigerant pipe for discharging the high-pressure gas refrigerant to the outside of the pressure-tight container 2. The fixed portion of the drain pipe 7 and the cover 2c is joined by brazing, resistance welding, or the like, for example.

A glass terminal 8 is disposed on the upper surface of the lid 2c of the pressure-tight container 2. The glass terminal 8 provides an interface to an external power source. The external power supply is a power supply device for supplying electric power to the compressor 1, and is a general industrial ac power supply having an ac frequency of 50Hz or 60Hz or a variable frequency power supply capable of changing the ac frequency. When a variable frequency power supply capable of changing the frequency is used, the rotation speed of the compressor 1 can be changed, and therefore the discharge amount of the high-pressure gas refrigerant from the discharge pipe 7 can be controlled in the compressor 1. In the following description, in the following drawings including fig. 1, an external power supply connected to the glass terminal 8 is not shown.

The motor unit 10, the shaft 20, and the compression mechanism unit 30 are housed in the pressure-tight container 2. The motor unit 10 is disposed above the position where the fixing member 6 is disposed in the pressure-tight container 2. The shaft 20 is provided in the center of the pressure-tight container 2 and is disposed between the motor portion 10 and the compression mechanism portion 30, and extends in the up-down direction between the motor portion 10 and the compression mechanism portion 30. The compression mechanism 30 is disposed such that the inside of the compression mechanism 30 communicates with the suction pipe 4. That is, the motor section 10 is disposed above the compression mechanism section 30 in the pressure-tight container 2. The hollow space inside the pressure-tight container 2 is filled with the high-pressure gas refrigerant compressed by the compression mechanism 30.

The motor unit 10 is configured as a motor that generates a rotational driving force by using electric power supplied from an external power source to the shaft 20 and transmits the rotational driving force to the compression mechanism unit 30 via the shaft 20. The motor unit 10 includes: a stator 12 having a hollow cylindrical appearance in plan view, and a cylindrical rotor 14 rotatably disposed inside the inner surface of the stator 12. The stator 12 is fixed to the inner side surface of the main body 2a of the pressure-tight container 2 by heat fitting or the like, and is connected to the glass terminal 8 via a lead wire 16. The motor unit 10 can rotate the rotor 14 inside the inner surface of the stator 12 by supplying electric power supplied from an external power source to the wound coil constituting the stator 12 via the lead wire 16. In the compressor 1, for example, a DC brushless motor or the like is used as the motor section 10.

A shaft 20 is fixed to a center portion of the rotor 14 so as to penetrate the rotor 14. The shaft 20 is a rotation shaft that fixes the rotor 14 to a fixing surface 20a that is a part of the outer surface of the shaft 20 and transmits the rotational driving force of the rotor 14 to the compression mechanism unit 30. The shaft 20 is provided so as to extend from the fixing surface 20a in the up-down direction, that is, in the direction of the lid portion 2c of the pressure-tight container 2 and the direction of the bottom portion 2b of the pressure-tight container 2.

The shaft 20 has an eccentric portion 24 located below the fixed surface 20a and disposed at a position corresponding to the cylinder 31 in the compression mechanism portion 30. A substantially cylindrical piston 26 rotatably attached along the outer side surface of the eccentric portion 24 is disposed on the outer periphery of the eccentric portion 24. When the shaft 20 is rotated by the motor unit 10, the piston 26 rotates along the inner peripheral surface thereof in the cylinder 31.

In the following drawings including fig. 1, an oil hole, which is not shown, is provided in the center of the shaft 20, and extends upward from the lower end of the shaft 20 to allow the lubricating oil 40, i.e., the refrigerating machine oil drawn from the lower end of the shaft 20, to flow. A plurality of oil supply ports that communicate with the oil holes and supply lubricating oil to the compression mechanism 30 are provided on the outer surface of the shaft 20.

In the following drawings including fig. 1, a centrifugal pump may be disposed at the lower end portion of the oil hole of the shaft 20, although not shown. The centrifugal pump is, for example, a spiral centrifugal pump so that the refrigerating machine oil 40 stored in the bottom 2b of the pressure-tight container 2 can be sucked. As the refrigerating machine oil 40, for example, mineral oil-based, alkylbenzene-based, polyalkylene glycol-based, polyvinyl ether-based, polyol ester-based lubricating oils and the like can be used.

Fig. 2 is a schematic view of a section A-A of fig. 1 showing an example of the internal structure of the compression mechanism 30 of the compressor 1 according to the present embodiment. Next, the structure of the compression mechanism 30 of the compressor 1 will be described with reference to fig. 1 and 2.

The compression mechanism 30 compresses the low-pressure gas refrigerant sucked from the suction pipe 4 into the low-pressure space of the pressure-tight container 2 by the rotational driving force supplied from the motor 10, and discharges the compressed high-pressure gas refrigerant to the upper side of the compression mechanism 30.

The compression mechanism 30 includes a hollow cylindrical cylinder 31, and the hollow cylindrical cylinder 31 includes a pair of hollow circular plate surfaces 31a, an inner surface 31b provided so as to extend between inner edge portions of the pair of hollow circular plate surfaces 31a, and an outer surface 31c provided so as to extend between outer edge portions of the pair of hollow circular plate surfaces 31 a. The outer surface 31c of the cylinder 31 is fixed to the inner surface of the main body 2a of the pressure-tight container 2 by arc welding such as arc spot welding or heat staking. The hollow portion 310 of the cylinder 31 is a space surrounded by the inner surface 31b of the cylinder 31, and accommodates the eccentric portion 24 of the shaft 20 and the piston 26. That is, the cylinder 31 is configured such that the eccentric portion 24 of the shaft 20 and the piston 26 can be eccentrically rotated by the rotation of the shaft 20 in the hollow portion 310 of the cylinder 31.

A suction passage 312 is formed in the cylinder 31, and the suction passage 312 communicates between the suction pipe 4 and the hollow portion 310 of the cylinder 31 via a connection pipe 6a, so that low-pressure gas refrigerant flows from the suction pipe 4 into the hollow portion 310 of the cylinder 31. The suction muffler 3 is connected to the hollow portion 310 via the suction passage 312. A semicircular discharge passage 314 extending in the up-down direction is provided in the inner side surface of the cylinder 31. In addition, in the cylinder 31, a vane groove 316 is formed in a radial direction between the inner side surface 31b of the cylinder 31 and the outer side surface 31c of the cylinder 31 in a plan view.

The vane 32 is accommodated in the vane groove 316 of the cylinder 31. The vane 32 is a sliding member configured to reciprocate in the radial direction inside the vane groove 316 by the eccentric movement of the piston 26. The tip 32a of the vane 32 disposed in the hollow portion 310 of the cylinder 31 is pressed to always contact the outer surface of the piston 26 by the restoring force of the elastic body 33 such as a spring provided in the vane groove 316 or the pressure from the high-pressure portion above the compression mechanism 30. As shown in fig. 2, during the rotational driving of the piston 26, the hollow portion 310 of the cylinder 31 is partitioned by the vane 32 and the piston 26 into a low-pressure space portion 310a communicating with the suction passage 312 and a high-pressure space portion 310b communicating with the discharge passage 314. The low-pressure space portion 310a and the high-pressure space portion 310b form a space constituting a compression chamber of the compression mechanism portion 30 described later. In the compression chamber of the compression mechanism 30, the low-pressure space 310a is also referred to as a low-pressure chamber, and the high-pressure space 310b is also referred to as a high-pressure chamber.

Further, the cylinder 31 is provided with a vane groove opening 318 which communicates with the vane groove 316 and penetrates the pair of hollow circular plate surfaces 31a of the cylinder 31. In the compression mechanism 30, the pressure from the high-pressure portion above the compression mechanism 30 can be applied to the distal end portion 32b of the vane 32 via the vane groove opening 318. The compression mechanism 30 can restrict the movement of the vane 32 in the outer surface direction of the cylinder 31 by the vane groove opening 318. Further, the lubricating oil separated from the high-pressure gas refrigerant is supplied to the gap between the vane groove 316 and the vane 32 through the vane groove opening 318, and the vane 32 can be smoothly reciprocated.

In the following drawings including fig. 1, although not shown, a gap between the blade groove 316 and the blade 32 is configured so that friction does not occur between the blade groove 316 and the blade 32. On the other hand, if the gap between the vane groove 316 and the vane 32 increases, the refrigerant gas compressed by the hollow portion 310 of the cylinder 31 may leak to the outside of the compression mechanism portion 30 through the gap and the vane groove opening 318, and the compression efficiency may be reduced. Therefore, in the compression mechanism portion 30, the clearance is reduced to such an extent that friction does not occur between the vane groove 316 and the vane 32, and thus leakage of the compressed refrigerant gas can be suppressed, and leakage loss can be reduced, thereby improving compression efficiency.

Further, a plurality of openings 319 penetrating the pair of hollow circular plate surfaces 31a are formed in the cylinder 31 on one side of the outer side surface 31c of the cylinder 31. The lubricating oil separated from the high-pressure gas refrigerant and moved by gravity toward the hollow circular plate surface 31a on the upper side of the cylinder 31 can return to the bottom 2b of the pressure-tight container 2 through the opening 319, so that the compressor 1 can prevent the refrigerant oil 40 from being exhausted.

An upper bearing 34 is disposed on the hollow circular plate surface 31a on the upper side of the cylinder 31, that is, on the hollow circular plate surface 31a on the side of the lid portion 2c of the pressure-tight container 2. A lower bearing 35 is disposed on the hollow circular plate surface 31a on the lower side of the cylinder 31, that is, on the hollow circular plate surface 31a on the side of the bottom 2b of the pressure-tight container 2. The upper bearing 34, the cylinder 31, and the lower bearing 35 penetrate the shaft 20. The upper bearing 34 and the lower bearing 35 are slide bearings that slidably support the shaft 20. The upper bearing 34 and the lower bearing 35 rotatably support the shaft 20.

The upper bearing 34 is provided on the upper surface of the cylinder 31 to block the upper opening of the hollow portion 310. The lower bearing 35 is provided on the lower surface portion of the cylinder 31 to block the lower opening of the hollow portion 310. In this way, the upper bearing 34, the cylinder 31, and the lower bearing 35 are stacked in this order, and the upper and lower openings of the hollow portion 310 are closed by the upper bearing 34 and the lower bearing 35, whereby the air tightness in the hollow portion 310 can be ensured.

The upper bearing 34 has a hollow disk-like shape in plan view. The upper bearing 34 has a fixing portion 34a fixed to the hollow circular plate surface 31a on the upper side of the cylinder 31, and a bearing portion 34b slidably supporting the outer surface of the shaft 20. The upper bearing 34 is shown as 2L-shaped members in the vertical cross-sectional view of fig. 1. The upper bearing 34 is fixed to the hollow circular plate surface 31a on the upper side of the cylinder 31 by, for example, bolts or the like.

The lower bearing 35 has a hollow disk-like shape in plan view. The lower bearing 35 has a fixing portion 35a fixed to the hollow circular plate surface 31a on the lower side of the cylinder 31, and a bearing portion 35b slidably supporting the outer surface of the shaft 20. The lower bearing 35 is shown as 2L-shaped members in the vertical cross-section of fig. 1. The lower bearing 35 is fixed to the hollow circular plate surface 31a of the lower side of the cylinder 31 by, for example, bolts.

Further, a muffler for removing or reducing noise generated during compression of the refrigerant in the compression mechanism portion 30 can be disposed on the upper surface side of the fixing portion 34a of the upper bearing 34. The muffler may be provided with a plurality of openings for discharging the high-pressure gas refrigerant flowing in from the discharge port provided in the upper bearing 34 into the pressure-tight container 2.

In the compression mechanism 30, a closed space surrounded by the piston 26, the cylinder 31, the vane 32, the fixing portion 34a of the upper bearing 34, and the fixing portion 35a of the lower bearing 35 constitutes a compression chamber for compressing the low-pressure gas refrigerant sucked from the suction pipe 4. The high-pressure gas refrigerant compressed in the compression chamber is discharged from a discharge port provided in the upper bearing 34. The discharge port provided in the upper bearing 34 is not shown in the following drawings including fig. 1.

In the present embodiment, the compressor 1 is configured as a vertical compressor, but may be configured as a horizontal compressor. In the present embodiment, the compressor 1 is configured as a rotary piston type rotor compressor, but may be configured as a rocking vane type rocking compressor, or may be configured as a screw compressor or a scroll compressor. In the present embodiment, the rotary compressor is configured as a single rotary compressor, but may be configured as a double rotary compressor. In the present embodiment, the compressor 1 is a single-stage compressor having only 1 compression mechanism unit 30, but the compressor 1 may be a multi-stage compressor, and the plurality of compression mechanism units 30 sequentially compress the refrigerant.

[ action of compressor 1 ]

Next, an operation of the compressor 1 of the present embodiment will be described. When the shaft 20 is rotated by the driving of the motor unit 10, the eccentric portion 24 and the piston 26 accommodated in the cylinder 31 eccentrically rotate together with the shaft 20. By the eccentric rotation of the eccentric portion 24 and the piston 26, the outer peripheral surface of the piston 26 moves in contact with the inner surface 31b of the cylinder 31 at the hollow portion 310 of the cylinder 31. The vane 32 disposed in the vane groove 316 of the cylinder 31 moves in a piston motion in association with the eccentric rotation of the piston 26 of the cylinder 31. The low-pressure gas refrigerant flowing from the suction pipe 4 into the compression mechanism portion 30 through the suction passage 312 flows into the compression chamber, which is a closed space surrounded by the piston 26, the cylinder 31, the vane 32, the fixed portion 34a of the upper bearing 34, and the fixed portion 35a of the lower bearing 35. The low-pressure gas refrigerant flowing into the compression chamber is compressed into a high-pressure gas refrigerant by the reduction in the volume of the compression chamber due to the eccentric rotation of the piston 26. The high-pressure gas refrigerant is discharged to the hollow space inside the pressure-tight container 2 outside the compression mechanism portion 30 through the discharge port provided in the upper bearing 34. The high-pressure gas refrigerant discharged into the hollow space of the pressure-tight container 2 is discharged to the outside of the pressure-tight container 2 through the discharge pipe 7, for example, through a gap between the stator 12 and the rotor 14 of the motor unit 10.

[ method of manufacturing compressor 1 ]

Next, a method and an apparatus for manufacturing the compressor 1 according to the present embodiment will be described.

Fig. 3 is a flowchart showing a processing procedure of a method for manufacturing the main body 2a constituting the pressure-tight container 2. The main body 2a of the pressure-tight container 2 is manufactured by forming a steel plate 50. More specifically, the body portion 2a is manufactured by performing a winding process (step S1), a shrinking process (step S2), a butt welding process (step S3), a bead crushing process (step S4), and a tube expanding process (step S5) on the rectangular steel plate 50. Here, first, each processing step of winding (step S1), shrinking (step S2), and butt welding (step S3) will be described, and then, a weld bead crushing (step S4) which is a characteristic part of the present invention will be described.

Fig. 4 is a perspective view schematically showing the appearance of a steel plate 50 before molding, which is used in the process of manufacturing the body portion 2a of the pressure-tight container 2 in the process of manufacturing the compressor 1 according to the present embodiment. As shown in fig. 3, in the production of the main body 2a, a rectangular and flat steel plate 50 having a first plate-like surface portion 52a and a second plate-like surface portion 52b is used as the front surface and the rear surface. The first plate-like surface portion 52a and the second plate-like surface portion 52b are a pair of rectangular plate-like surface portions 52. The first edge 54a and the second edge 54b of the rectangular steel plate 50 form edges on the short side. The first edge portion 54a and the second edge portion 54b are edge portions located opposite to each other in the steel sheet 50. The third edge portion 56a and the fourth edge portion 56b of the rectangular steel plate 50 form a long-side edge portion. The third edge portion 56a and the fourth edge portion 56b are edge portions located opposite to each other in the steel sheet 50. As a material of the steel plate 50, for example, a steel material such as stainless steel or carbon steel is used.

[ winding (step S1) ]

Fig. 5 is a schematic diagram showing a structure of a steel sheet 50 before winding and a structure of a part of a roll device 100 in the manufacturing process of the compressor 1 according to the present embodiment.

As shown in fig. 5, in the winding process of the steel sheet 50, for example, a roll apparatus 100 having a first roll 100a, a second roll 100b, and a third roll 100c is used. In the roll device 100, the diameter of the first roll 100a is larger than the diameters of the second roll 100b and the third roll 100 c. The steel sheet 50 is arranged such that one plate-like surface portion 52 of the steel sheet 50, for example, the second plate-like surface portion 52b is in contact with the first roller 100 a.

Fig. 6 is a schematic diagram showing a structure of a steel plate 50 at the start of winding and a structure of a part of a roll device 100 in the manufacturing process of the compressor 1 according to the present embodiment. In fig. 6, the pressing directions of the second roller 100b and the third roller 100c with respect to the steel sheet 50 at the start of the winding process are indicated by arrows.

As shown in fig. 6, at the start of the winding process, the second roll 100b and the third roll 100c are pressed against the first plate-like surface portion 52a of the steel sheet 50 perpendicularly to each other in the roll device 100, and the steel sheet 50 is pressed against the first roll 100 a. The rolling device 100 is capable of sandwiching the steel sheet 50 between the second roller 100b and the third roller 100c and the first roller 100a by the pressing operation of the second roller 100b and the third roller 100c against the steel sheet 50.

Fig. 7 is a schematic view showing a structure of a steel sheet 50 during winding and a structure of a part of a roll device 100 in the manufacturing process of the compressor 1 according to the present embodiment. In fig. 7, the rotational directions of the first roll 100a, the second roll 100b, and the third roll 100c during the winding process of the steel sheet 50 are indicated by arrows.

As shown in fig. 7, in the winding process of the steel sheet 50, the first roller 100a performs a rotation operation in a direction opposite to that of the second roller 100b and the third roller 100 c. For example, as shown in fig. 7, in the roll device 100, a clockwise rotation operation is performed in the first roll 100a, and a counterclockwise rotation operation is performed in the second roll 100b and the third roll 100 c. The rolling device 100 is capable of performing a winding process with respect to the steel sheet 50 by moving the steel sheet 50 along the first roller 100a in the rotational direction of the first roller 100a by the rotational operation of the first roller 100a, the second roller 100b, and the third roller 100 c.

Fig. 8 is a schematic diagram showing a structure of a steel plate 50 at the end of winding and a structure of a part of a roll device 100 in the manufacturing process of the compressor 1 according to the present embodiment.

As shown in fig. 8, the steel sheet 50 is wound and formed into a coil shape such that the third edge portion 56a is C-shaped by the rotation of the first, second, and

third rolls

100a, 100b, 100C in the roll device 100. After the completion of the winding process with respect to the steel sheet 50, the second roll 100b and the third roll 100c are moved in the direction away from the steel sheet 50 in the roll device 100. After the movement of the second roller 100b and the third roller 100c, the steel sheet 50 is removed from the first roller 100a in the rolling device 100.

As described above, in the manufacturing process of the compressor 1 according to the present embodiment, the rectangular steel plate 50 is formed into a coil shape by the winding process with respect to the steel plate 50, as described in fig. 5 to 8.

[ shrinkage tube processing (step S2) ]

Fig. 9 is a schematic diagram showing the structure of a steel plate 50 and a part of a shrink tube device 110 at the start of shrink tube processing in the manufacturing process of the compressor 1 according to the present embodiment.

As shown in fig. 9, in the tube-shrinking process of the rolled steel plate 50, for example, the tube-shrinking device 110 having the first tube-shrinking die 112 having the first groove 112a with a semicircular shape and the second tube-shrinking die 114 having the second groove 114a with a semicircular shape is used. In the tube shrinkage device 110, the first groove 112a of the first tube shrinkage die 112 is disposed to face the second groove 114a of the second tube shrinkage die 114. At the start of the tube shrinkage process, the steel plate 50 wound in a coil shape is sandwiched between the first groove 112a and the second groove 114a of the tube shrinkage device 110.

Fig. 10 is a schematic view showing the structures of the steel plate 50 and the pipe reducing device 110 during pipe reducing in the manufacturing process of the compressor 1 according to the present embodiment. In fig. 10, the arrow indicates the pressing direction of the second shrink tube mold 114 in the shrink tube processing of the steel plate 50.

As shown in fig. 10, in the tube shrinkage process of the steel plate 50, the second tube shrinkage die 114 is pressed against the first tube shrinkage die 112 in the tube shrinkage device 110. The first edge 54a and the second edge 54b of the steel plate 50 can be brought into contact with each other by the pressing operation of the second pipe-shrinking mold 114 in the pipe-shrinking device 110. Further, by the pressing operation of the second pipe-shrinking die 114, the steel plate 50 sandwiched between the first groove 112a and the second groove 114a can be formed into a cylindrical shape. After the completion of the shrink tube processing with respect to the steel plate 50, the second shrink tube mold 114 is moved away from the steel plate 50 in the shrink tube device 110. After the movement of the second shrink tube mold 114, in the shrink tube device 110, the steel plate 50 is removed from the first shrink tube mold 112.

As described above, in the manufacturing process of the compressor 1 according to the present embodiment, the coil-shaped steel plate 50 is shrunk into the cylindrical steel plate 50 by the shrink-tube processing with respect to the steel plate 50 as described in fig. 9 and 10. Thereby, the steel plate 50 is formed in a state in which the opposite ends of the first edge portion 54a and the second edge portion 54b are in contact with each other.

[ Butt welding (step S3) ]

Fig. 11 is a schematic view showing the structure of a portion of the butt welding device 120 and the steel sheet 50 during butt welding in the manufacturing process of the compressor 1 according to the present embodiment. In fig. 11, the direction of movement of the butt welding device 120 during the butt welding process is indicated by an arrow. As shown in fig. 11, the first edge portion 54a and the second edge portion 54b of the steel plate 50 formed into a cylindrical shape by pipe shrinking are joined by the butt welding device 120. That is, in the butt welding process, the seam between the two ends of the steel plate 50 that are abutted by the pipe shrinking process is welded by the butt welding device 120.

The butt welding device 120 is configured as a welding device for resistance welding such as seam welding or a welding device for arc welding such as TIG welding, for example. The butt welding apparatus 120 includes a welding gun 122 for welding the first edge portion 54a and the second edge portion 54b of the steel sheet 50. Although not shown in fig. 11, the butt welding device 120 includes, for example, a welding power source that converts ac power supplied from an industrial ac power source into power to be used for welding, and a welding transformer that amplifies current flowing from the welding power source into current for welding and flows the current to the welding gun 122. Welding electrode 124 is attached to tip 122a of welding gun 122. The welding electrode 124 may be formed of a pure metal electrode such as a pure tungsten electrode or a pure molybdenum electrode, or an alloy electrode such as a copper-chromium alloy electrode or a copper-aluminum alloy electrode.

The joining of the first edge portion 54a and the second edge portion 54b of the steel plate 50 is performed by welding, but may be performed by brazing or the like.

In the manufacturing process of the compressor 1 of the present embodiment, the rolled steel pipe 50a constituting the main body portion 2a of the cylindrical pressure-tight container 2 is formed by butt welding of the steel plate 50. That is, the steel plate 50 is formed into a cylindrical shape by a plate-like surface portion 52 of the steel plate 50 by winding, shrinking, or the like, and the third edge portion 56a and the fourth edge portion 56b, which are edge portions of the steel plate 50, are formed into a circumferential shape. Then, by the butt welding process, the first edge 54a and the second edge 54b of the steel plate 50 are joined by welding or the like, thereby manufacturing the rolled steel pipe 50a.

Fig. 12 is a schematic view of a cross section of a rolled steel pipe 50a formed by performing a winding process, a shrinking process, and a butt welding process on a steel plate 50. As shown in fig. 12, a back bead 131 as a weld bead is formed to protrude from the inner peripheral surface of the rolled steel pipe 50 a. The bead is a projection of a weld mark generated by the welding process. The back bead 131 protrudes from the inner surface 50b of the rolled steel pipe 50 a. In the manufacturing process of the compressor 1 of the present embodiment, the rolled steel pipe 50a manufactured through the above-described steps is supplied to the weld bead crushing process in the next step (step S4).

[ crushing of weld bead (step S4) ]

Fig. 13 is a schematic plan view showing a structure of a part of the bead crushing jig 90 at the time of bead crushing processing in the manufacturing process of the compressor 1 of the present embodiment. Fig. 14 is a schematic plan view showing a structure of a part of the bead crushing jig 90 at the time of bead crushing processing in the manufacturing process of the compressor 1 of the present embodiment. A bead crushing jig 90 used in the bead crushing process will be described with reference to fig. 13 and 14. The bead crushing process performed by the bead crushing jig 90 is characterized in that the bead removal process can be performed on the rolled steel pipe 50a immediately after welding (melting) in the above-described butt welding process, but the cooled bead removal process can be performed on the rolled steel pipe 50a after the welding process is completed and cooled.

As shown in fig. 13 and 14, the bead crushing jig 90 includes: a fixed receiving mold 91 having a semi-cylindrical shape in plan view, a housing 92 to which the fixed receiving mold 91 is fixed, and a movable roller pressing mold 93 having a drum shape.

The fixing and receiving mold 91 is a columnar member formed in a D-shape and having a continuously extending cross section. The fixing and receiving mold 91 is formed of a curved surface having an arc shape protruding outward, and has a side wall portion 91a facing the movable roller pressing mold 93. The side wall 91a forms one side surface of the fixing receiving mold 91. The side wall portion 91a is formed in an arc shape in a vertical section with respect to a direction in which the fixing receiving mold 91 formed in a columnar shape extends.

The movable roller pressing mold 93 is a rotating body having a peripheral wall portion 93a formed to be recessed in an arc shape at a central portion in an axial direction of the rotating shaft RS. More specifically, the movable roller pressing mold 93 has a shape in which the diameter is smaller at the center in the axial direction of the roller than at both ends. The movable roller pressing mold 93 has a peripheral wall surface portion 93a facing the fixed receiving mold 91. The peripheral wall portion 93a of the movable roller pressing die 93 is formed in a circular arc shape in which a wall between both ends in the axial direction of the rotation shaft RS is recessed in the axial direction of the rotation shaft RS, and is formed in a shape continuous in the circumferential direction around the rotation shaft RS. The rotation axis RS of the movable roller pressing die 93 crosses in a state orthogonal to the fixed receiving die 91 formed in a columnar shape.

In the bead crushing jig 90, the side wall portion 91a and a part of the peripheral wall portion 93a face each other. The bead crushing jig 90 is configured such that a peripheral wall portion 93a formed in a concave shape is fitted to a side wall portion 91a formed in a convex shape via a rolled steel pipe 50 a. The housing 92 of the bead crushing jig 90 is fixed to a bead crushing device (not shown). Therefore, the fixing and receiving die 91 is fixed to a bead crushing device (not shown) via the housing 92.

Fig. 15 is a simplified plan view of the bead crushing jig 90 and the rolled steel pipe 50a before the bead crushing process. Fig. 16 is a simplified side view of the bead crushing jig 90 and the rolled steel tube 50a before bead crushing. In fig. 15 and 16, the movement direction of the bead crushing jig 90 during the bead crushing process is indicated by an arrow. Next, in the manufacturing process of the compressor 1 according to the present embodiment, a process for crushing a weld bead formed in the rolled steel pipe 50a will be described with respect to the rolled steel pipe 50a manufactured by the rolling process, the shrinking process, and the butt welding process of the steel plate 50. As shown in fig. 15 and 16, in the weld bead crushing process, the fixing and receiving die 91 and the outer shell 92 are inserted into the rolled steel pipe 50 a. In this state, the fixing and receiving die 91 is opposed to the back surface 50b of the rolled steel pipe 50a and the back surface 131 formed on the inner surface 50 b. That is, the fixing and receiving die 91 is inserted into the hollow portion of the rolled steel pipe 50a formed in a cylindrical shape, and the side wall portion 91a is disposed so as to face the back bead 131 formed so as to protrude from the inner peripheral surface of the rolled steel pipe 50 a. In this state, the rolled steel pipe 50a is disposed between the fixed receiving mold 91 and the movable roller pressing mold 93. In addition, at this time, the back-bonding path 131 may be cooled immediately after melting. In the bead crushing jig 90, when the fixed receiving die 91 and the outer shell 92 are inserted into the rolled steel pipe 50a, the movable roller pressing die 93 moves so as to approach the fixed receiving die 91, as shown by arrows in fig. 15 and 16.

Fig. 17 is a simplified plan view of the bead crushing jig 90 and the rolled steel pipe 50a at the time of bead crushing processing. Fig. 18 is a simplified side view of the bead crushing jig 90 and the rolled steel pipe 50a at the time of bead crushing processing. As shown in fig. 17 and 18, in the bead crushing jig 90, the rolled steel pipe 50a is sandwiched between the movable roller pressing die 93 and the fixed receiving die 91. Then, the bead crushing jig 90 presses the rolled steel pipe 50a with the movable roller pressing die 93, and moves the movable roller pressing die 93 in the axial direction of the rolled steel pipe 50 a. In fig. 17 and 18, the movable roller pressing die 93 moves from the top to the bottom while rotating. That is, the movable roller pressing die 93 is disposed so as to face the side wall portion 91a with the rolled steel pipe 50a interposed therebetween, and the peripheral wall portion 93a presses the rolled steel pipe 50a and moves in the direction in which the rolled steel pipe 50a extends while rotating. The movable roller pressing die 93 presses the rolled steel pipe 50a, and the movable roller pressing die 93 moves in the direction in which the rolled steel pipe 50a extends while rotating, whereby the back weld path 131 of the rolled steel pipe 50a is crushed. Further, when the movable roller pressing die 93 presses the rolled steel pipe 50a, and when the movable roller pressing die 93 moves along the rolled steel pipe 50a, the fixed receiving die 91 is fixed to the housing 92 without moving.

In the steel sheet 50, the plate-like surface portion 52 of the steel sheet 50 is formed into a cylindrical shape by winding, shrinking, or the like with respect to the steel sheet 50, and the third edge portion 56a and the fourth edge portion 56b, which are edge portions of the steel sheet 50, are formed into a circumferential shape. Then, the first edge portion 54a and the second edge portion 54b of the steel plate 50 are joined by welding or the like according to the butt welding process, thereby manufacturing the rolled steel pipe 50a. Further, by performing the bead crushing process on the rolled steel pipe 50a, the back weld path 131 formed in the rolled steel pipe 50a is crushed, and a cylindrical body of the body portion 2a of the pressure-tight container 2 can be manufactured. The countermeasure in the bead crushing process for improving the roundness of the body portion 2a will be described later.

[ tube expansion processing (step S5) ]

Fig. 19 is a schematic view showing a cross-sectional structure of a rolled steel pipe 50a and a cross-sectional structure of a part of a pipe expanding jig 70 before one pipe expanding process in the manufacturing process of the compressor 1 according to the embodiment of the present invention. Fig. 20 is a schematic diagram showing a cross-sectional structure of a rolled steel pipe 50a and a cross-sectional structure of a part of a pipe expanding jig 70 at the time of one pipe expanding process in the manufacturing process of the compressor 1 according to the embodiment of the present invention. In fig. 20, the moving direction of the stem 72 in the primary pipe expansion is indicated by a hatched box arrow, and the moving direction of the pipe expansion die portion 71 accompanying the movement of the stem 72 is indicated by a hollow box arrow.

Next, in the manufacturing process of the compressor 1 of the present embodiment, a process of expanding the rolled steel pipe 50a, which is obtained by performing the rolling process, the pipe shrinking process, the butt welding process, and the weld bead crushing process, will be described. The step of expanding the rolled steel pipe 50a is a step of reducing the deformation of the body 2a of the pressure-tight container 2 produced by the rolling process, the shrinking process, and the butt welding of the steel plate 50 by pressing from the inner wall surface side, and is referred to as "primary expanding" in the following description.

As shown in fig. 19, the pipe expander jig 70 includes an pipe expander die portion 71 for performing one-time pipe expansion processing on the rolled steel pipe 50a, and a housing portion 73 for supporting the pipe expander die portion 71. The pipe expanding jig 70 includes a rod portion 72 reciprocally disposed inside the pipe expanding die portion 71 and the housing portion 73.

The pipe expansion die portion 71 is formed in a cylindrical shape. The pipe expansion die portion 71 is configured to be divided in the circumferential direction. That is, the pipe expansion die portion 71 is formed by combining each of the constituent parts divided into a plurality of parts in the circumferential direction. As shown in fig. 19, a first hollow space 76 surrounded by a first inner surface portion 71a of the pipe expansion die portion 71 is formed inside the pipe expansion die portion 71. The first hollow space 76 is configured as a frustum-shaped space in which the opening area of the first hollow space 76 becomes smaller as it goes away from the housing portion 73.

The housing 73 has a second hollow space 77 surrounded by a second inner surface 73a of the housing 73. The second hollow space portion 77 communicates the outer space of the housing portion 73 with the first hollow space portion 76. The second hollow space portion 77 is formed, for example, as a cylindrical space having a larger opening area than the first hollow space portion 76. In fig. 19 and 20, the housing 73 is fixed to a support base in order to ensure stability during the primary pipe expansion and reliability during the primary pipe expansion, although not shown. The shape of the housing portion 73 may be any shape that can be fixed to a support table, and may be, for example, a cubic shape, a cylindrical shape, or the like.

As shown in fig. 19, the stem 72 has a frustoconical insertion portion 78. That is, the lever portion 72 is formed in a tapered shape. The insertion portion 78 of the rod portion 72 is accommodated in the first hollow space portion 76 of the pipe expanding die portion 71 via the second hollow space portion 77 of the housing portion 73.

Next, a processing example of one expansion processing for the rolled steel pipe 50a will be described. First, the expander jig 70 is inserted into the hollow of the rolled steel pipe 50a after the weld bead crushing. Next, the rod 72 disposed at the center of the pipe expansion die 71 divided into a plurality of parts in the circumferential direction of the cylindrical shape is pushed in the axial direction, whereby the pipe expansion die 71 is expanded. Then, the rolled steel pipe 50a is expanded to a desired inner diameter by being pushed from the inner diameter side toward the outer diameter side by the outer side surface 71b of the pipe expansion die portion 71 by the pipe expansion die portion 71 being expanded.

When the primary pipe expansion process is completed, the coiled steel pipe 50a is subjected to both end processes. In both end processing, the peripheral edge portions of both end portions of the rolled steel pipe 50a after the primary pipe expansion processing are cut by an end face processing device such as a lathe. The rolled steel pipe 50a is processed to a desired length by end face processing with respect to both end portions of the rolled steel pipe 50a, for example, in the same manner as the length between both end portions of the main body portion 2a of the pressure-tight container 2 in the completed product of the compressor 1.

When the both ends are finished, the coiled steel pipe 50a is subjected to circumferential welding. In the circumferential welding process, the bottom 2b is fitted to one end of the rolled steel pipe 50a having both ends thereof processed, and the fitted portion of the rolled steel pipe 50a and the bottom 2b is fixed by welding. The joining of the rolled steel pipe 50a and the bottom 2b of the pressure-tight vessel 2 is performed by welding, but may be performed by brazing or the like.

When the both ends are finished, the coiled steel pipe 50a is fed to the suction hole processing. In the suction hole processing, the suction hole 5 is formed in the rolled steel pipe 50a by a piercing device such as a drill. The connection pipe 6a and the ring 6b are joined to the suction hole 5 formed in the coiled steel pipe 50a by welding, brazing, or the like. In the rolled steel pipe 50a, the inner diameter of the rolled steel pipe 50a is deformed by the perforation of the suction hole 5, and by the welding or brazing of the connection pipe 6a and the ring 6b.

In the manufacturing process of the compressor 1 of the present embodiment, in order to reduce the deformation described above, the inner diameter of the main body 2a of the pressure-tight container 2 is made uniform, and the pipe expansion process is performed by a pipe expansion jig (not shown). In the following description, the pipe expansion process performed by the pipe expansion jig is referred to as "secondary pipe expansion process".

Fig. 21 is a diagram showing the shape of the main body 2a1 of the comparative example after the pipe expansion process. In the secondary pipe expansion process, in order to correct the inner diameter deformation of the rolled steel pipe 50a generated in the suction hole process or the like, the rolled steel pipe 50a is expanded to a desired inner diameter by the pipe expansion jig 70 having the same structure as the primary pipe expansion process, thereby manufacturing the main body 2a. Here, in this case, the shape of the inner diameter of the body portion 2a may not be completely corrected even after the pipe expansion process due to a winding mark generated at the start of winding in the winding process, welding heat curing generated in the butt welding process, or the like, and the degree of roundness of the inner diameter of the body portion 2a may not be improved. For example, as shown in fig. 21, the main body 2a1 of the comparative example after the pipe expansion may be formed in a water-drop shape.

In the method for manufacturing the compressor 1 according to the embodiment of the present invention, the main body 2a after the pipe expansion is suppressed from having a water drop shape, and a specific countermeasure in the weld crushing process will be described below as a countermeasure for improving the roundness of the main body 2a.

[ countermeasure for improving the roundness of the body portion 2a ]

First, based on the manufacturing process of the compressor 1 of the present embodiment, trial manufacturing of the rolled steel pipe 50a is performed a plurality of times. In the test production of the rolled steel pipe 50a, the main body 2a after the pipe expansion is formed into a drop shape or the like, and therefore, as a countermeasure for improving the roundness of the main body 2a after the pipe expansion, countermeasures are taken at the stage of the crushing process of the weld path. As a countermeasure for improving the roundness of the main body portion 2a, the fixed receiving mold 91 and the movable roller pressing mold 93 are configured such that the relationship between the circular arc shape of the fixed receiving mold 91 and the movable roller pressing mold 93 and the circular arc shape in the outer and inner peripheral surfaces of the rolled steel pipe 50a and the rolled steel pipe 50a1 of the comparative example satisfies the following expression. The radius Riw is smaller than the radius Ru and smaller than or equal to the radius Rie, the radius Row is smaller than the radius Rr and smaller than or equal to the radius Roe, and the radius Rr-radius Ru=t (t is the wall thickness of the steel pipe). The fixed receiving mold 91 and the movable roller pressing mold 93 are configured such that the relationship between the width Wu of the fixed receiving mold 91 and the width Wr of the movable roller pressing mold 93 and the width Ww of the range of the rolled steel pipe 50a, which is welded and thermally cured, and the rolling mark satisfies that the width Wu is equal to or smaller than the width Ww < the width Wr. The dimensions of the rolled steel pipe 50a of the comparative example can be derived at the stage of the test production of the compressor 1, and the circular arc shape is specified based on the values obtained in the plurality of test productions of the rolled steel pipe 50a, and is used for the actual production of all the compressors 1. Hereinafter, the above-described various contents will be specifically described.

Fig. 22 is a schematic view of the movable roller pressing die 93 of the bead crushing jig 90. Fig. 23 is a schematic view of the fixing and receiving mold 91 of the bead crushing jig 90. As shown in fig. 22 and 23, the radius of curvature of the circular arc shape in the side wall portion 91a of the stationary receiving mold 91 is defined as a radius Ru in a plan view. In addition, in a plan view, a radius of curvature of an arc shape in the peripheral wall surface portion 93a of the movable roller pressing die 93 is defined as a radius Rr.

Fig. 24 is a schematic view showing the cross-sectional shapes of the rolled steel pipe 50a before the weld bead crushing process and the rolled steel pipe 50a1 of the comparative example after the secondary pipe expansion process. The radius of curvature of the circular arc shape in the inner peripheral surface 51 of the rolled steel pipe 50a before the primary expansion process of the rolled steel pipe 50a, that is, before the bead crushing process, is defined as a radius Riw, and the radius of curvature of the circular arc shape in the outer peripheral surface 53 is defined as a radius Row. Then, the radius of curvature of the circular arc shape in the inner peripheral surface 51a of the rolled steel pipe 50a1 of the comparative example after the secondary pipe expansion process is defined as the radius Rie, and the radius of curvature of the circular arc shape in the outer peripheral surface 53a is defined as the radius Roe.

Here, the relationship between the circular arc shape of the fixed receiving die 91 and the movable roller pressing die 93 and the circular arc shape of the outer and inner peripheral surfaces of the rolled steel pipe 50a and the rolled steel pipe 50a1 of the comparative example satisfies the radius Riw < the radius ru+.r and the radius Row < the radius rr+.r. The circular arc shape of the fixed receiving die 91 and the movable roller pressing die 93 satisfies a radius Rr-a radius ru=t (t is the wall thickness of the steel pipe).

Next, the width of the bead crushing jig 90 in the axial direction of the rotation shaft RS will be described. As shown in fig. 22, the width of the movable roller pressing die 93 in the axial direction of the rotation shaft RS is defined as a width Wr. The width Wr is a linear distance between the two end portions 93b of the movable roller pressing die 93 in the axial direction of the rotation shaft RS. As shown in fig. 23, the width of the rotation shaft RS in the axial direction of the fixing and receiving mold 91 in a plan view is defined as a width Wu. The width Wu is a linear distance between both end portions 91b of the side wall portion 91a in a plan view of the fixed receiving mold 91. As shown in fig. 24, the width of the region of the weld heat-cured portion and the rolling mark of the rolled steel pipe 50a is set to be the width Ww. The width Ww is a linear distance between the welding heat-cured portion and both ends 50e of the range of the rolling mark in a vertical cross section with respect to the axial direction of the rolled steel pipe 50a and in the circumferential direction of the rolled steel pipe 50a in the outer surface of the rolled steel pipe 50 a. Further, the width Ww is specified based on the values obtained in the test production of the rolled steel pipe 50a for a plurality of times according to the production process of the compressor 1 of the present embodiment, and is used for the entire production of the compressor 1.

Here, the relationship between the width Wu of the fixed receiving die 91 and the width Wr of the movable roller pressing die 93 and the width Ww of the range of the rolled steel pipe 50a and the rolling mark by welding and heat curing satisfies that the width Wu is equal to or less than the width Ww < the width Wr.

Next, the reason why the relation between the fixed receiving die 91 and the movable roller pressing die 93 and the rolled steel pipe 50a1 of the comparative example satisfies the radius Riw < the radius Ru. Ltoreq.radius Rie, the radius Row < the radius Rr. Ltoreq.radius Roe, and the radius Rr-radius ru=t (t is the wall thickness of the steel pipe) will be described.

Fig. 25 is a schematic view of a bead crushing jig 90A based on the structure of the first comparative example. Fig. 26 is a schematic cross-sectional view of a rolled steel pipe 50A2 obtained by performing bead crushing processing by a bead crushing jig 90A having a structure according to the first comparative example and performing subsequent pipe expansion processing. The first comparative example has a structure in which, in the bead crushing jig 90A, the radius Rus of the fixed receiving die 91 and the radius Rrs of the movable roller pressing die 93 are smaller than the radius Riw and the radius Row of the rolled steel pipe 50A before the bead crushing process. In the first comparative example, the radius Rus of the fixed receiving die 91 is smaller than the radius Ru, and the radius Rrs of the movable roller pressing die 93 is smaller than the radius Rr in the bead crushing jig 90A.

In the bead crushing processing, when the bead crushing jig 90A having the structure according to the first comparative example is used, as shown in fig. 26, the shape of the rolled steel pipe 50A2 after the pipe expansion processing causes the processed portion 56 of the bead crushing processing to have a convex shape. In the bead crushing processing, when the bead crushing jig 90A having the structure according to the first comparative example is used, the correction of the weld heat-cured portion and the rolling mark of the rolled steel pipe 50A2 can be performed, but even through the pipe expansion processing, the deformation of the rolled steel pipe 50A by the bead crushing processing cannot be corrected.

Fig. 27 is a schematic view of a bead crushing jig 90B based on the structure of the second comparative example. Fig. 28 is a schematic cross-sectional view of a rolled steel pipe 50a3 after weld bead crushing processing is performed by a weld bead crushing jig 90B of a structure according to a second comparative example, and subsequent pipe expansion processing is performed. The second comparative example has a structure in which, in the bead crushing jig 90B, the radius Rul of the fixed receiving die 91 and the radius Rrl of the movable roller pressing die 93 are larger than the radius Rie and the radius Roe of the rolled steel pipe 50a1 after the secondary pipe expansion process. In the second comparative example, the radius Rul of the fixed receiving die 91 is larger than the radius Ru and the radius Rrl of the movable roller pressing die 93 is larger than the radius Rr in the bead crushing jig 90B.

In the bead crushing processing, in the case of using the bead crushing jig 90B of the structure based on the second comparative example, as shown in fig. 28, the shape of the rolled steel pipe 50a3 after the pipe expansion processing causes the processed portion 57 of the bead crushing processing to be a flat shape. In the bead crushing processing, even when the bead crushing jig 90B of the structure according to the second comparative example is used, the correction of the weld heat-cured portion and the rolling mark of the rolled steel pipe 50a3 can be performed, but the correction of the deformation of the rolled steel pipe 50a by the bead crushing processing cannot be performed even by the pipe expanding processing.

Fig. 29 is a schematic view of a bead crushing jig 90C based on the structure of the third comparative example. Fig. 30 is a schematic cross-sectional view of a rolled steel pipe 50a4 after weld bead crushing processing is performed by a weld bead crushing jig 90C of a structure according to a third comparative example, and subsequent pipe expansion processing is performed. The third comparative example is a structure in which, in the bead crushing jig 90C, the radius Rud of the fixed receiving mold 91 is larger than the radius Rrd of the movable roller pressing mold 93. For example, a structure in which the radius Rud is larger than the radius Ru and the radius Rrd is smaller than the radius Rr is provided.

In the bead crushing processing, when the bead crushing jig 90C of the structure of the third comparative example is used, as shown in fig. 30, the shape of the rolled steel pipe 50a4 after the pipe expansion processing causes the processed portion 58 of the bead crushing processing to be mountain-shaped. This is a state in which the movable roller pressing die 93 is crushing the rolled steel pipe 50a at the 2 point of the both end portions 93b with respect to the fixed receiving die 91, and cannot be corrected even by pipe expansion.

Fig. 31 is a diagram summarizing the relationship between the circular arc shape of the fixed receiving die 91 and the movable roller pressing die 93 and the outer and inner peripheral surfaces of the rolled steel pipe 50a and the rolled steel pipe 50a1 of the comparative example. For the reasons described above in the first to third comparative examples, it is necessary that the radius Ru and the radius Rr of the bead crushing jig 90 satisfy the above-described expression in order to improve the inside diameter shape of the rolled steel pipe 50a after the expansion and to improve the inside diameter roundness of the rolled steel pipe 50 a. That is, the arc shape of the bead crushing jig 90 needs to satisfy the formulas of radius Riw < radius ru+.ltoreq.radius Rie, radius Row < radius rr+.ltoreq.radius Roe, and radius rr—radius ru=t (t is the wall thickness of the steel pipe).

Next, the reason why the relationship between the width Wu of the fixed receiving die 91 and the width Wr of the movable roller pressing die 93 and the width Ww of the range of the rolled steel pipe 50a, in which the width Wu is equal to or smaller than the width Ww < the width Wr, is satisfied will be described.

Fig. 32 is a schematic view of a bead crushing jig 90D based on the structure of the fourth comparative example. Fig. 33 is a schematic cross-sectional view of a rolled steel pipe 50a5 after weld bead crushing processing is performed by a weld bead crushing jig 90D of a structure according to a fourth comparative example, and subsequent pipe expansion processing is performed. In fig. 32, the fixing receiving mold 91 is not shown. The fourth comparative example has a structure in which the width Wr of the movable roller pressing die 93 is smaller than the width Ww of the range of the weld heat curing and the rolling mark of the rolled steel pipe 50a in the bead crushing jig 90D.

In the bead crushing processing, when the bead crushing jig 90D having the structure according to the fourth comparative example is used, as shown in fig. 33, the shape of the rolled steel pipe 50a5 after the pipe expansion processing causes the processed portion 59 of the bead crushing processing to be heart-shaped. This is a state in which both side portions of the welded portion 132 of the rolled steel pipe 50a5 are not straightened and expanded during the bead crushing process, and is a state in which straightening is impossible even through the pipe expanding process.

Fig. 34 is a schematic view of a bead crushing jig 90E based on the structure of the fifth comparative example. In fig. 34, the movable roller pressing mold 93 is not shown. The fifth comparative example has a structure in which the width Wu of the fixed receiving die 91 is larger than the width Ww of the range of the weld heat curing and the rolling mark of the rolled steel pipe 50a in the bead crushing jig 90E.

In the bead crushing processing, even when the bead crushing jig 90E having the structure according to the fifth comparative example is used, as shown in fig. 33, the shape of the rolled steel pipe 50a5 after the pipe expansion processing causes the processed portion 59 of the bead crushing processing to be heart-shaped. This is a state in which both side portions of the welded portion 132 of the rolled steel pipe 50a5 are not straightened and expanded during the bead crushing process, and is a state in which straightening is impossible even through the pipe expanding process.

Fig. 35 is a schematic view of a bead crushing jig 90F based on the structure of the sixth comparative example. Fig. 36 is a schematic cross-sectional view of a rolled steel pipe 50a6 after weld bead crushing processing is performed by a weld bead crushing jig 90F of a structure according to a sixth comparative example, and subsequent pipe expansion processing is performed. The fifth comparative example is a configuration in which the width Wu of the fixed receiving die 91 is larger than the width Wr of the movable roller pressing die 93 in the bead crushing jig 90F.

In the bead crushing processing, even when the bead crushing jig 90F having the structure according to the sixth comparative example is used, as shown in fig. 36, the shape of the rolled steel pipe 50a6 after the pipe expansion processing causes the processed portion 59 of the bead crushing processing to be heart-shaped. This is a state in which both side portions of the welded portion 132 of the rolled steel pipe 50a6 are not straightened and expanded during the bead crushing process, and is a state in which straightening is impossible even through the pipe expanding process.

Fig. 37 is a diagram summarizing the relationship between the width Wu of the fixed receiving die 91 and the width Wr of the movable roller pressing die 93, and the width Ww of the range of the weld heat curing and the rolling mark of the rolled steel pipe 50 a. For the reasons described above in the fourth to sixth comparative examples, it is necessary that the widths Wu and Wr of the bead crushing jigs 90 satisfy the above-described expression in order to improve the inside diameter shape of the rolled steel pipe 50a after the expansion and to improve the inside diameter roundness of the rolled steel pipe 50 a. That is, the bead crushing jig 90 needs to satisfy the expression of width Wu and width Ww < width Wr in the relation between the fixed receiving die 91 and the movable roller pressing die 93 and the rolled steel pipe 50 a.

The side wall 91a of the fixing and receiving die 91 is disposed so as to face the back bead 131 formed so as to protrude from the inner peripheral surface of the rolled steel pipe 50 a. The peripheral wall portion 93a of the movable roller pressing die 93 is disposed so as to face the side wall portion 91a with the rolled steel pipe 50a interposed therebetween, and the peripheral wall portion 93a presses the rolled steel pipe 50a and moves in the direction in which the rolled steel pipe 50a extends while rotating. Therefore, the back-welded channel 131 formed to protrude from the inner peripheral surface of the rolled steel pipe 50a is sandwiched between the peripheral wall surface 93a and the side wall 91a, and is pressed along the inner diameter shape of the rolled steel pipe 50a and along the direction in which the rolled steel pipe 50a extends. Therefore, the bead crushing jig 90, the method for manufacturing the compressor 1 using the bead crushing jig 90, and the compressor 1 can stably form the bead at the portion protruding from the inner peripheral surface into a shape conforming to the inner diameter shape of the body portion 2a, and do not cause trouble in chip disposal.

Further, there is a concern that the inside diameter roundness of the body portion 2a may be deteriorated due to a thermosetting part in the vicinity of the welded portion generated in the butt welding process, a winding mark generated at the start of winding in the winding process, or the like. In contrast, the peripheral wall surface portion 93a of the movable roller pressing die 93 is disposed so as to face the side wall portion 91a with the rolled steel pipe 50a interposed therebetween, and the peripheral wall surface portion 93a presses the rolled steel pipe 50a and moves in the direction in which the rolled steel pipe 50a extends while rotating. Therefore, the heat-cured portion in the vicinity of the welded portion generated during the butt welding process and the winding mark generated at the start of winding in the winding process can be corrected in the main body portion 2a of the pressure-tight container 2, and the inner diameter accuracy of the main body portion 2a can be improved.

In general, the body 2a is formed by recessing a weld bead toward the inner diameter side of the body 2a during the butt welding process. The main body 2a of this structure may leak refrigerant or the like from the welded portion having a reduced thickness, and may become an important factor for deterioration of welding quality. In contrast, the side wall portion 91a of the fixing and receiving die 91 is disposed so as to face the back bead 131 formed so as to protrude from the inner peripheral surface of the rolled steel pipe 50 a. The peripheral wall portion 93a of the movable roller pressing die 93 is disposed so as to face the side wall portion 91a with the rolled steel pipe 50a interposed therebetween, and the peripheral wall portion 93a presses the rolled steel pipe 50a and moves in the direction in which the rolled steel pipe 50a extends while rotating. Therefore, the back-welded channel 131 formed to protrude from the inner peripheral surface of the rolled steel pipe 50a is sandwiched between the peripheral wall surface 93a and the side wall 91a, and is pressed along the inner diameter shape of the rolled steel pipe 50a and along the direction in which the rolled steel pipe 50a extends. Therefore, the body portion 2a does not have a welded portion having a reduced thickness during the butt welding process, and leakage of the refrigerant from the welded portion can be suppressed. As a result, the bead crushing jig 90, the method for manufacturing the compressor 1 using the bead crushing jig 90, and the compressor 1 can improve the welding quality in the main body 2 a.

In the bead crushing process, a method of sandwiching the entire periphery of the rolled steel pipe 50a by the receiving die, the pressing die, and the movable roller is considered. However, both the receiving die and the pressing die are movable dies, and there is a concern that the bead crushing process is unstable and the rolled steel pipe 50a is deformed. In contrast, the peripheral wall surface portion 93a of the movable roller pressing die 93 is disposed so as to face the side wall portion 91a with the rolled steel pipe 50a interposed therebetween, and the peripheral wall surface portion 93a presses the rolled steel pipe 50a and moves in the direction in which the rolled steel pipe 50a extends while rotating. That is, the fixing and receiving mold 91 is fixed at the time of the weld bead crushing process, and the position of the side wall 91a is not moved. Therefore, the bead crushing jig 90, the method for manufacturing the compressor 1 using the bead crushing jig 90, and the compressor 1 can stably form the bead in the portion protruding from the inner peripheral surface into a shape conforming to the inner diameter shape of the body 2 a.

The bead crushing process is configured to face the side wall portion 91a to the cooled back bead 131. The bead crushing process can remove the bead from the cooled back bead 131. Therefore, the bead crushing process does not require removal of the bead immediately after welding (melting) of the rolled steel pipe 50 a. As a result, the bead crushing processing can perform the bead removal processing at intervals from the welding (melting) of the rolled steel pipe 50a, and therefore there are no restrictions on the place of the manufacturing process and no restrictions on time.

The relationship between the circular arc shape of the fixed receiving die 91 and the movable roller pressing die 93 and the circular arc shape of the outer and inner peripheral surfaces of the rolled steel pipe 50a and the rolled steel pipe 50a1 of the comparative example satisfies the radii Riw < the radius Ru. Ltoreq. Radius Rie, the radii Row < the radius Rr. Ltoreq. Radius Roe, and the radii Rr-radius ru=t (t is the wall thickness of the steel pipe). The relationship between the width Wu of the fixed receiving die 91 and the width Wr of the movable roller pressing die 93 and the width Ww of the range of the rolled steel pipe 50a and the width Ww of the rolling mark satisfies that the width Wu is equal to or smaller than the width Ww < the width Wr. That is, the bead crushing jig 90 determines the circular arc shape of the opposing surfaces of the fixed receiving die 91 and the movable roller pressing die 93 and the width shape of the die so as to match the expanded pipe shape of the rolled steel pipe 50 a. Therefore, the bead crushing jig 90, the method for manufacturing the compressor 1 using the bead crushing jig 90, and the compressor 1 can further stably correct the weld bead heat-cured portion and the winding mark in the winding process. Further, with this configuration and this method, since the inner diameter accuracy of the main body portion 2a is improved, the assembling performance of the compressor 1 can be improved, and the assembling accuracy of the motor portion 10 and the compression mechanism portion 30 of the compressor 1 can be improved, thereby improving the performance of the compressor 1.

The configuration shown in the above embodiment is an example, and may be combined with other known techniques, and a part of the configuration may be omitted or changed without departing from the gist of the present invention.

Description of the reference numerals

1 … compressor; 2 … pressure-tight container; 2a … body portion; 2a1 … main body portion; 2b … bottom; 2c … cover; 3 … suction muffler; 3a … shell; 3b … inflow tube; 4 … suction pipe; 5 … suction holes; 6 … fixing member; 6a … connecting tube; 6b … ring; 7 … discharge tube; 8 … glass terminals; 10 … motor part; 12 … stator; 14 … rotor; 16 … wire; 20 … axis; 20a … fixing surfaces; 24 … eccentric portion; 26 … piston; 30 … compression mechanism; 31 … cylinder; 31a … hollow round plate surface; 31b … inner side; 31c … outer side; 32 … blades; 32a … front end portion; 32b … end portion; 33 … elastomer; 34 … upper bearing; 34a … fixing portions; 34b … bearing portions; 35 … lower bearing; 35a … fixing portion; 35b … bearing portions; 40 … refrigerator oil; 50 … steel plate; 50a … coiled steel pipe; 50a1 and … coiled steel pipes; 50a2 … coiled steel pipe; 50a3 and … coiled steel pipes; 50a4 and … coiled steel pipes; 50a5 … coiled steel pipe; 50a6 … coiled steel pipe; 50b … inner side; 50e …;51 … inner peripheral surfaces; 51a … inner peripheral surface; 52 … plate-like face; 52a … first plate-like face portion; 52b … second plate-like face; 53 … outer peripheral surfaces; 53a … outer peripheral surfaces; 54a … first edge portion; 54b … second edge portions; 56 … processing section; 56a … third edge portion; 56b … fourth edge portion; 57 … processed portion; 58 … working part; 59 … working; 70 … pipe expanding clamp; 71 … pipe expanding die section; 71a … first inner side portion; 71b … outer side; 72 … stem; 73 … housing portions; 73a … second inner side portion; 76 … first hollow space portion; 77 … second hollow space portion; 78 … insert; 90 … bead crush fixture; 90a … bead crush fixture; 90B … bead crush fixture; 90C … bead crush fixture; 90D … bead crush fixture; 90E … bead crush fixture; 90F … bead crush fixture; 91 … fixing and receiving the die; 91a … side wall portions; 91b …;92 … casing; 93 … movable roller pressing die; 93a … peripheral wall portion; 93b …; a 100 … roller assembly; 100a … first roller; 100b … second roller; 100c … third roller; 110 … shrink tube device; 112 … first tube shrinking die; 112a … first groove portion; 114 … second tube shrinking die; 114a … second groove portion; 120 … butt welding device; 122 … welding gun; 122a … front end portion; 124 … welding electrode; 131 … back weld bead; 132 … weld; 310 … hollow; 310a … low-pressure space portion; 310b … high-pressure space portion; 312 … inhalation passage; 314 … vent passage; 316 … vane slots; 318 … vane slot opening; 319 … opening portions.

Claims

1. A method for manufacturing a compressor is characterized by comprising:

winding, namely forming a rectangular steel plate serving as a main body part of the pressure closed container into a coil shape;

shrink tube processing, namely forming the steel plate formed into a roll shape into a cylinder shape;

butt welding, wherein the opposite edge portions of the steel plates formed into a cylindrical shape are joined by welding;

a weld bead crushing process of crushing a weld bead formed to protrude from an inner peripheral surface of the welded steel pipe; and

a primary pipe expansion process of pressing from the inner peripheral surface side of the steel pipe to reduce deformation of the steel pipe,

when the one-time pipe expanding process is completed, the steel pipe is subjected to both-end processing, and when the both-end processing is completed, the steel pipe is subjected to suction hole processing in which a suction hole is formed in the steel pipe by a piercing device, and further processing is performed in which a connection pipe and a ring are joined to the suction hole formed in the steel pipe by welding or brazing;

a secondary pipe expanding process for making the inner diameter of the steel pipe uniform,

in the weld bead crushing process, a fixing and receiving die formed in a columnar shape and having a side wall portion formed by a curved surface of an arc shape protruding outward is inserted into a hollow portion of the steel pipe formed in a cylindrical shape, and the side wall portion is disposed so as to face a weld bead formed so as to protrude from an inner peripheral surface of the steel pipe,

The movable roller pressing die as a rotating body has a peripheral wall surface portion formed to be recessed in an arc shape in a central portion in an axial direction of a rotating shaft, and is disposed so that the peripheral wall surface portion faces the side wall portion via the steel pipe, the peripheral wall surface portion presses the steel pipe while rotating and moving in a direction in which the steel pipe extends,

for the crushing process of the weld bead,

a radius of curvature of the circular arc shape at the side wall portion of the fixing and receiving mold is defined as a radius Ru,

a radius of curvature of the circular arc shape at the peripheral wall face portion of the movable roller pressing die is defined as a radius Rr,

the radius of curvature of the arc shape at the inner peripheral surface of the steel pipe before the weld bead crushing process is defined as a radius Riw, the radius of curvature of the arc shape at the outer peripheral surface is defined as a radius Row,

the radius of curvature of the circular arc shape at the inner peripheral surface of the steel pipe after the secondary pipe expansion processing determined based on the values obtained in the multiple trial manufacturing is defined as a radius Rie, the radius of curvature of the circular arc shape at the outer peripheral surface is defined as a radius Roe,

when the wall thickness of the steel pipe is set to t,

the weld bead crushing processing uses the fixed receiving die and the movable roller pressing die set to satisfy the following conditions,

The conditions are as follows:

radius Riw is smaller than radius Ru and smaller than radius Rie,

radius Row < radius Rr is less than or equal to radius Roe,

radius Rr-radius ru=t.

2. A method of manufacturing a compressor according to claim 1, wherein,

the bead crushing process is configured to dispose the side wall portion so as to face the cooled bead.

3. A method for manufacturing a compressor according to claim 1 or 2, wherein,

in defining the width of the movable roller pressing die in the axial direction as a width Wr,

the axial width of the stationary receiving mold is defined as a width Wu,

when the width of the range of the weld heat-cured portion and the curl of the steel pipe determined based on the values obtained in the test production is set to the width Ww,

the conditions are as follows:

the width Wu is less than or equal to the width Ww and less than the width Wr.