Sealed container for compressor, compressor, refrigeration cycle device, and method for manufacturing sealed container for compressor

Abstract

This sealed container for a compressor has a tubular body, and a lid that is provided on one end side of the body in an axial direction. The body comprises a curved section that is integrally formed on the one end side and is formed into a convex curve, the lid being fixed to said curved section. The curved section comprises a punched section that is formed by punching the one end side using a punch and a die. A droop and a shear surface are formed on the inner peripheral surface of the punched section, from the outside toward the inside of the punched section. The lid is fixed to the entire inner periphery of the punch section by resistance welding.

Description

Hermetic container of compressor, compressor, refrigeration cycle device, and method for manufacturing hermetic container of compressor

[0001] The present disclosure relates to a hermetic container for a compressor, a compressor, a refrigeration cycle device, and a method for manufacturing a hermetic container for a compressor.

[0002] For example, Patent Document 1 discloses a metal container, such as a heat exchanger header or receiver, in which an arc-shaped end wall is formed by bending the open end of a metal blank tube inward into an arc-like shape, and a reinforcing cap made of the same material as the metal blank tube is press-fitted into the arc-shaped end wall. The arc-shaped end wall is formed by spinning or press-forming so as to have a small hole in the center of the tip. The reinforcing cap has an arc-shaped cross section and is press-fitted to the arc-shaped end wall so as to leave a small gap with the inner surface of the arc-shaped end wall near the small hole. The reinforcing cap is brazed to the arc-shaped end wall with brazing material poured through the small hole to close the end wall.

[0003] Japanese Unexamined Patent Publication No. 54-58677

[0004] In the metal container of Patent Document 1, the brazing is performed by pouring the brazing material into a small gap between the metal base tube and the reinforcing cap, so it is difficult to completely braze the entire circumference of the metal base tube around its axis, making it difficult to provide airtightness. Therefore, there is a demand for improved welding stability and improved airtightness in sealed containers.

[0005] An object of the present disclosure is to provide a sealed container for a compressor, a compressor, a refrigeration cycle device, and a method for manufacturing a sealed container for a compressor that can improve airtightness.

[0006] The sealed container of the compressor according to the present disclosure has a cylindrical body and a lid provided at one end of the body in the axial direction, the body being integrally formed at the one end and having a curved portion formed with a convex curve, to which the lid is fixed, the curved portion having a punched portion formed at the one end by punching with a punch and die, the inner surface of the punched portion having sagging and shear surfaces formed from the outside to the inside of the punched portion, and the lid being fixed around the entire inner circumference of the punched portion by resistance welding.

[0007] In addition, the sealed container of the compressor according to the present disclosure has a cylindrical body and a lid provided at one end of the body in the axial direction, the body having a cylindrical portion and a curved portion integrally formed with the one end of the cylindrical portion and formed with a convex curve, the curved portion having a punched portion formed at the one end by punching with a punch and a die, sagging and shear surfaces formed on the inner surface of the punched portion from the inside to the outside of the punched portion, and the lid is fixed around the entire outer circumference of the punched portion by resistance welding.

[0008] The compressor according to the present disclosure includes the above-described sealed container, an electric motor disposed within the sealed container, and a compression mechanism disposed within the sealed container, driven by the electric motor, and configured to compress a refrigerant drawn from outside the sealed container.

[0009] A refrigeration cycle device according to the present disclosure includes the above-described compressor, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger.

[0010] The method for manufacturing a sealed container for a compressor according to the present disclosure is a method for manufacturing a sealed container for a compressor having a cylindrical body and a lid provided at one end of the body in the axial direction, and includes: a spinning process in which the one end of a cylindrical member is spinned to form the body, the body having a cylindrical portion and a curved portion integrally formed at the one end of the cylindrical portion and formed with a convex curve, with an opening formed at the end of the curved portion; a punching process in which the periphery of the opening is punched out with a punch and a die to form a punched portion, and sagging, shear surfaces, fracture surfaces, and burrs are formed in that order on the inner surface of the punched portion from the outside to the inside of the punched portion; and a resistance welding process in which the lid provided at the one end of the body is welded by resistance welding to the entire circumference of the burr.

[0011] In addition, a manufacturing method of a sealed container for a compressor according to the present disclosure is a manufacturing method of a sealed container for a compressor having a cylindrical body and a lid body provided at one end side of the body in the axial direction, and includes: a spinning process in which the one end of a cylindrical member is spinned to form the body having a cylindrical portion and a curved portion integrally formed at the one end of the cylindrical portion and formed with a convex curve, with an opening formed at an end of the curved portion; a punching process in which the periphery of the opening is punched with a punch and a die to form a punched portion, and sagging, shear surfaces, fracture surfaces, and burrs are formed in that order on the inner surface of the punched portion from the inside to the outside of the punched portion; and a resistance welding process in which the lid body, located at the one end side of the body, is welded to the entire circumference of the burr by resistance welding.

[0012] According to the present disclosure, a punched portion is formed on one end side of the body by punching out with a punch and die, and a bottom lid is fixed around the entire inner circumference of the punched portion by resistance welding, thereby improving the airtightness of the sealed container.

[0013] FIG. 1 is a cross-sectional view of a compressor according to embodiment 1 of the present disclosure; FIG. 2 is a cross-sectional view of a compression mechanism of the compressor according to embodiment 1 of the present disclosure, as seen from above; FIG. 3 is a schematic configuration diagram of a refrigeration cycle device to which the compressor according to embodiment 1 of the present disclosure is connected; FIG. 4 is a cross-sectional view of an electric motor of the compressor according to embodiment 1 of the present disclosure, as seen from above; FIG. 5 is an enlarged view of a bottom cover of the compressor according to embodiment 1 of the present disclosure; FIG. 6 is a flowchart illustrating a method for manufacturing a body of a sealed container according to embodiment 1 of the present disclosure; FIG. 7 is a perspective view illustrating a material shape of a sealed container according to embodiment 1 of the present disclosure; FIG. 8 is a schematic side view illustrating a winding process in a method for manufacturing a sealed container according to embodiment 1 of the present disclosure; FIG. 9 is a schematic side view illustrating a tube shrinking process in a method for manufacturing a sealed container according to embodiment 1 of the present disclosure; FIG. 10 is a schematic perspective view illustrating a butt welding process in a method for manufacturing a sealed container according to embodiment 1 of the present disclosure; FIG. 11 is a schematic cross-sectional view illustrating a tube expansion process in a method for manufacturing a sealed container according to embodiment 1 of the present disclosure; FIG. 12 is a schematic cross-sectional view illustrating a tube expansion process in a method for manufacturing a sealed container according to embodiment 1 of the present disclosure; FIG. 1 is a schematic cross-sectional view illustrating a punching process in a method for manufacturing a sealed container according to embodiment 1 of the present disclosure. FIG. 2 is an enlarged view of a punched portion of the sealed container according to embodiment 1 of the present disclosure. FIG. 3 is a schematic cross-sectional view illustrating a resistance welding process in a method for manufacturing a sealed container according to embodiment 1 of the present disclosure. FIG. 4 is a cross-sectional view of a bottom lid of a sealed container according to modified example 1 of embodiment 1 of the present disclosure. FIG. 5 is a cross-sectional view of a sealed container according to modified example 1 of embodiment 1 of the present disclosure. FIG. 6 is a schematic cross-sectional view illustrating a method for manufacturing a sealed container according to modified example 2 of embodiment 1 of the present disclosure. FIG. 7 is an enlarged cross-sectional view illustrating a punching process in a method for manufacturing a sealed container according to modified example 2 of embodiment 1 of the present disclosure. FIG. 8 is a partial cross-sectional view of a sealed container according to modified example 2 of embodiment 1 of the present disclosure. FIG. 9 is a partial cross-sectional view of a sealed container according to modified example 3 of embodiment 1 of the present disclosure. FIG. 10 is a partial cross-sectional view of a sealed container according to modified example 4 of embodiment 1 of the present disclosure.

[0014] Embodiments of the present disclosure will be described below with reference to the drawings. The present disclosure is not limited to the following embodiments and can be modified in various ways without departing from the spirit and scope of the present disclosure. Furthermore, the present disclosure includes all possible combinations of the configurations shown in the following embodiments. In particular, the combinations of components are not limited to those in each embodiment; components described in one embodiment can be applied to another embodiment. The configurations shown in the drawings are merely examples of the configurations of the present disclosure, and the present disclosure is not limited to the configurations shown in the drawings. In the following description, directional terms (e.g., "up," "down," "right," "left," "front," "rear," etc.) are used as appropriate to facilitate understanding, but these are for explanatory purposes and do not limit the present disclosure. In each drawing, components designated with the same reference numerals are identical or equivalent, and this applies throughout the entire specification. The relative dimensional relationships or shapes of the components in each drawing may differ from those in the actual product.

[0015] First Embodiment <Configuration of Compressor 100> FIG. 1 is a cross-sectional view of a compressor 100 according to a first embodiment of the present disclosure. The compressor 100 is a hermetic compressor, e.g., a cylinder-type rotary compressor. The compressor 100 includes a sealed container 10, a compression mechanism 20 that compresses refrigerant gas housed in the sealed container 10, and an electric motor 30 that drives the compression mechanism 20 housed in the sealed container 10. The sealed container 10 includes an upper lid 11, a body 12, and a bottom lid 380. The body 12 has a cylindrical shape, such as a cylinder, that extends in the axial direction. The bottom lid 380 is an example of a lid. The compression mechanism 20 is housed below the sealed container 10, and the electric motor 30 is housed above the sealed container 10. In the following description, the lower side of the compressor 100 in the plane of the drawing will be referred to as one end side D, and the upper side of the compressor 100 will be referred to as the other end side U. The bottom lid 380 is provided on the lower side of the body 12, i.e., on one end side D, and closes the one end side D. The upper lid 11 is provided on the upper side of the body 12, i.e., on the other end side U, and closes the other end side U.

[0016] The body 12 has a cylindrical shape. The body 12 includes a cylindrical portion 342 and a curved portion 341 integrally formed at one end of the cylindrical portion 342. The cylindrical portion 342 is a portion that extends in a cylindrical shape. The cylindrical portion 342 has, for example, a cylindrical shape. The curved portion 341 continues from one end side D of the cylindrical portion 342 and is formed integrally with the cylindrical portion 342. The curved portion 341 is formed so as to be convexly curved in a cross section in a plane passing through the axis.

[0017] A punched portion 373 is formed at one end D of the curved portion 341. The punched portion 373 is formed by punching using a punch 371 and a die 372 (see FIG. 14). A second arc portion 384 (see FIG. 5) of the bottom cover 380 is fixed to the entire inner periphery of the punched portion 373 by resistance welding.

[0018] The compression mechanism 20 and the electric motor 30 are connected by a rotating shaft 21. The rotating shaft 21 transmits the rotational motion of the electric motor 30 to the compression mechanism 20. In the compression mechanism 20, the rotational force transmitted via the rotating shaft 21 compresses the refrigerant gas. The compressed refrigerant gas is discharged into the sealed container 10. The sealed container 10 is filled with compressed, high-temperature, high-pressure refrigerant gas. Refrigerant oil is stored below, i.e., at the bottom of, the sealed container 10 to lubricate the compression mechanism 20. An oil pump (not shown) is provided below the rotating shaft 21. As the rotating shaft 21 rotates, the oil pump draws up the refrigerant oil stored at the bottom of the sealed container 10 and supplies it to each sliding part of the compression mechanism 20. This ensures mechanical lubrication of the compression mechanism 20.

[0019] The rotating shaft 21 is composed of a main shaft portion 21a, an eccentric shaft portion 21b, and a counter shaft portion 21c, which are arranged in this order in the axial direction. An electric motor 30 is fixed to the main shaft portion 21a by shrink fitting or press fitting, and a cylindrical rolling piston 22 is slidably fitted to the eccentric shaft portion 21b.

[0020] Fig. 2 is a cross-sectional view of compression mechanism 20 of compressor 100 according to the first embodiment of the present disclosure, as viewed from above, taken along line A-A in Fig. 1. Compression mechanism 20 is composed of a cylinder 23, a rolling piston 22, an upper bearing 24, a lower bearing 25, and a vane 26.

[0021] The cylinder 23 has a cylindrical space, i.e., a cylinder chamber 23a, formed therein. The cylinder chamber 23a accommodates an eccentric shaft portion 21b of the rotary shaft 21 that performs eccentric motion within the cylinder chamber 23a, a rolling piston 22 fitted to the eccentric shaft portion 21b, and a vane 26. The vane 26 separates the space formed by the inner periphery of the cylinder chamber 23a and the outer periphery of the rolling piston 22.

[0022] A vane groove 23c is formed in the cylinder 23, one side of which opens into the cylinder chamber 23a and the other side of which is provided with a back pressure chamber 23b, and a vane 26 is housed in the vane groove 23c. The vane 26 reciprocates radially within the vane groove 23c. When attached to the vane groove 23c, the vane 26 has a substantially rectangular parallelepiped shape whose thickness in the circumferential direction of the cylinder chamber 23a is smaller than the radial and axial lengths of the cylinder chamber 23a.

[0023] A vane spring (not shown) is provided in the back pressure chamber 23b of the vane groove 23c. Normally, high-pressure refrigerant gas in the sealed container 10 flows into the back pressure chamber 23b, and the pressure difference between the refrigerant gas pressure in the back pressure chamber 23b and the refrigerant gas pressure in the cylinder chamber 23a generates a force that moves the vane 26 radially toward the center of the cylinder chamber 23a. The force resulting from this pressure difference between the back pressure chamber 23b and the cylinder chamber 23a, together with the radial pressing force of the vane spring, moves the vane 26 radially toward the center of the cylinder chamber 23a. The force that moves the vane 26 radially causes one end of the vane 26, i.e., the end on the cylinder chamber 23a side, to abut against the cylindrical outer periphery of the rolling piston 22. This separates the space defined by the inner periphery of the cylinder 23 and the outer periphery of the rolling piston 22. There are cases where the pressure difference between the refrigerant gas in the sealed container 10, i.e., the pressure of the refrigerant gas in the back pressure chamber 23b and the pressure of the refrigerant gas in the cylinder chamber 23a, is not sufficient to press the vane 26 against the outer periphery of the rolling piston 22. Even in this case, the force of the vane spring can press one end of the vane 26 against the outer periphery of the rolling piston 22, so that one end of the vane 26 can always abut against the outer periphery of the rolling piston 22.

[0024] The upper bearing 24 is fitted onto the main shaft portion 21a of the rotary shaft 21 to rotatably support the main shaft portion 21a and closes one axial opening of the cylinder chamber 23a. Similarly, the lower bearing 25 is fitted onto the counter shaft portion 21c of the rotary shaft 21 to rotatably support the counter shaft portion 21c and closes one axial opening of the cylinder chamber 23a. The cylinder 23 is provided with a suction port that draws refrigerant gas into the cylinder chamber 23a from outside the sealed container 10, and the upper bearing 24 is provided with a discharge port that discharges compressed refrigerant gas out of the cylinder chamber 23a. The upper bearing 24 is approximately inverted T-shaped in side view, and the lower bearing 25 is approximately T-shaped in side view.

[0025] A discharge valve is provided in the discharge port of the upper bearing 24, and controls the discharge timing of the high-temperature, high-pressure refrigerant gas discharged through the discharge port from the cylinder 23. That is, the discharge valve closes until the refrigerant gas compressed in the cylinder chamber 23a of the cylinder 23 reaches a predetermined pressure, and opens when the pressure reaches or exceeds the predetermined pressure, thereby discharging the high-temperature, high-pressure refrigerant gas out of the cylinder chamber 23a.

[0026] Because suction, compression, and discharge operations are repeated within the cylinder chamber 23a, the refrigerant gas discharged from the discharge port is discharged intermittently, which can cause noise such as pulsating sounds. To reduce noise, a discharge muffler 27 is attached to the outer side of the upper bearing 24, i.e., on the motor 30 side, so as to cover the upper bearing 24. The discharge muffler 27 has a discharge hole that communicates the space formed by the discharge muffler 27 and the upper bearing 24 with the inside of the sealed container 10. The refrigerant gas discharged from the cylinder 23 through the discharge port is first discharged into the space formed by the discharge muffler 27 and the upper bearing 24, and then discharged from the discharge hole into the sealed container 10.

[0027] A suction muffler 101 is provided next to the sealed container 10 to prevent liquid refrigerant from being directly drawn into the cylinder chamber 23a of the cylinder 23. Generally, a mixture of low-pressure refrigerant gas and liquid refrigerant is fed to the compressor 100 from an external circuit connected to the compressor 100. If the liquid refrigerant flows into the cylinder 23 and is compressed by the compression mechanism 20, the compression mechanism 20 will malfunction. Therefore, the suction muffler 101 separates the liquid refrigerant from the refrigerant gas, and only the refrigerant gas is sent to the cylinder chamber 23a. The suction muffler 101 is connected to the suction port of the cylinder 23 by a suction connecting pipe, and the low-pressure refrigerant gas sent from the suction muffler 101 is drawn into the cylinder chamber 23a via the suction connecting pipe.

[0028] The compression mechanism 20 is configured as described above. Rotation of the rotary shaft 21 rotates the eccentric shaft portion 21b of the rotary shaft 21 within the cylinder chamber 23a of the cylinder 23. The volume of the working chamber, defined by the inner periphery of the cylinder chamber 23a, the outer periphery of the rolling piston 22 fitted to the eccentric shaft portion 21b, and the vane 26, increases or decreases as the rotary shaft 21 rotates. Specifically, first, the working chamber and the suction port communicate with each other, and low-pressure refrigerant gas is drawn in. Next, the suction port is closed, and the volume of the working chamber decreases, compressing the refrigerant gas within the working chamber. Finally, the working chamber communicates with the discharge port. After the refrigerant gas within the working chamber reaches a predetermined pressure, a discharge valve provided in the discharge port opens, and the compressed, high-pressure, high-temperature refrigerant gas is discharged from the working chamber, i.e., the cylinder chamber 23a.

[0029] The high-pressure, high-temperature refrigerant gas discharged from the cylinder chamber 23a into the sealed container 10 via the discharge muffler 27 passes through the motor 30, rises inside the sealed container 10, and is discharged to the outside of the sealed container 10 from a discharge pipe 102 provided at the top of the sealed container 10. A refrigeration circuit through which the refrigerant flows is configured outside the sealed container 10, and the discharged refrigerant circulates through the refrigeration circuit and returns to the suction muffler 101.

[0030] 3 is a schematic diagram of a refrigeration cycle apparatus 200 to which the compressor 100 according to the first embodiment of the present disclosure is connected. In FIG. 3, solid lines indicate the circuit configuration and refrigerant flow direction during heating operation, and dashed lines indicate the circuit configuration and refrigerant flow direction during cooling operation. The refrigeration cycle apparatus 200 is, for example, an air conditioner.

[0031] As shown in FIG. 3 , the refrigeration cycle apparatus 200 includes an intake muffler 101 connected to the intake side of the compressor 100, a four-way switching valve 103 connected to the discharge side of the compressor 100, an outdoor heat exchanger 104, a pressure reducer 105, and an indoor heat exchanger 106. The four-way switching valve 103 switches the flow of refrigerant from the compressor 100. The pressure reducer 105 is, for example, an electric expansion valve. The intake muffler 101, the four-way switching valve 103, the outdoor heat exchanger 104, the pressure reducer 105, and the indoor heat exchanger 106 are sequentially connected via piping to form a refrigeration circuit. Generally, in a refrigeration cycle apparatus 200 that performs air conditioning, the indoor heat exchanger 106 is installed in an indoor device, and the remaining compressor 100, the four-way switching valve 103, the outdoor heat exchanger 104, and the pressure reducer 105 are installed in an outdoor device.

[0032] For example, during heating operation of the refrigeration cycle apparatus 200, the four-way switching valve 103 is connected to the solid line side in Fig. 3 . The high-temperature, high-pressure refrigerant compressed by the compressor 100 flows to the indoor heat exchanger 106, where it condenses and liquefies. The refrigerant is then throttled by the pressure reducer 105 to a two-phase state of low temperature and low pressure. The two-phase refrigerant flows to the outdoor heat exchanger 104, where it evaporates and gasifies, and returns to the compressor 100 through the four-way switching valve 103. That is, the refrigerant circulates as shown by the solid arrows in Fig. 3 . Through this circulation, the refrigerant exchanges heat with outside air in the outdoor heat exchanger 104, which serves as an evaporator, and absorbs heat. The refrigerant that has absorbed heat is then sent to the indoor heat exchanger 106, which serves as a condenser, where it exchanges heat with indoor air, thereby warming the indoor air.

[0033] In cooling operation, the four-way switching valve 103 is connected to the dashed line side in Figure 3. The high-temperature, high-pressure refrigerant compressed by the compressor 100 flows to the outdoor heat exchanger 104, condenses, and liquefies. After being throttled by the pressure reducer 105, the refrigerant becomes a two-phase refrigerant of low temperature and low pressure, and flows to the indoor heat exchanger 106. The refrigerant evaporates and gasifies in the indoor heat exchanger 106 and returns to the compressor 100 through the four-way switching valve 103. In other words, when the operation changes from heating to cooling, the indoor heat exchanger 106 changes from a condenser to an evaporator, and the outdoor heat exchanger 104 changes from an evaporator to a condenser. Therefore, the refrigerant circulates as shown by the dashed arrows in Figure 3. Through this circulation, the refrigerant exchanges heat with the indoor air in the indoor heat exchanger 106, which serves as an evaporator, absorbing heat from the indoor air and cooling it. The refrigerant that has absorbed heat is then sent to the outdoor heat exchanger 104, which serves as a condenser, where it exchanges heat with the outdoor air and releases heat into the outdoor air.

[0034] Examples of the refrigerant include a fluorine-based refrigerant or a hydrocarbon-based refrigerant with a low global warming potential (GWP). Examples of the refrigerant include a single refrigerant such as R1234yf, R1234ze, R32, or R290, a mixture of two or more of these, or a mixture of any of these with other refrigerants. Examples of the refrigerant include a mixed refrigerant containing R1132(E) or a mixed refrigerant containing R1123. Examples of the refrigerant include a mixed refrigerant containing R516A, R410A, R445A, R444A, R454C, R444B, R454A, R455A, R457A, R459B, R452B, R454B, R447B, R447A, R446A, and R459A.

[0035] Next, a description will be given of the electric motor 30 that transmits rotational force to the compression mechanism 20. Fig. 4 is a cross-sectional view of the electric motor 30 of the compressor 100 according to the first embodiment of the present disclosure as viewed from above, taken along line B-B in Fig. 1. As shown in Fig. 4, the electric motor 30 includes a substantially cylindrical stator 41 fixed to the inner periphery of the sealed container 10, and a substantially columnar rotor 31 disposed inside the stator 41.

[0036] The rotor 31 is composed of a rotor core 32 formed by laminating core sheets punched from thin electromagnetic steel plates. The rotor 31 can be configured in two ways: one using permanent magnets 34, as in a brushless DC motor, and the other using secondary windings, as in an induction motor. For example, in the case of a brushless DC motor as shown in FIG. 4 , magnet insertion holes 33 are provided axially in the rotor core 32, and permanent magnets 34, such as ferrite magnets or rare earth magnets, are inserted into the magnet insertion holes 33. The permanent magnets 34 form magnetic poles on the rotor 31. The rotor 31 is rotated by the interaction of the magnetic flux generated by the magnetic poles on the rotor 31 and the magnetic flux generated by the stator windings of the stator 41. In the case of an induction motor (not shown), a secondary winding is provided on the rotor core 32 instead of the permanent magnets 34, and the stator windings of the stator 41 induce magnetic flux in the secondary winding on the rotor side, generating a rotational force and rotating the rotor 31.

[0037] A shaft hole through which the rotating shaft 21 passes is provided in the center of the rotor core 32, and a main shaft portion 21a of the rotating shaft 21 is fastened by shrink fitting or the like. This allows the rotational motion of the rotor 31 to be transmitted to the rotating shaft 21. Air holes 35 are provided around the shaft hole, and high-pressure, high-temperature refrigerant compressed by the compression mechanism 20 below the electric motor 30 passes through the air holes 35. In addition to the air holes 35, the refrigerant compressed by the compression mechanism 20 also passes through the air gap between the rotor 31 and the stator 41 and the gaps in the stator windings.

[0038] Next, the configuration of the body 12 and the bottom lid 380 will be described in detail. FIG. 5 is an enlarged view of the bottom lid 380 of the compressor 100 according to the first embodiment of the present disclosure. As shown in FIG. 5 , the bottom lid 380 has a hat shape and includes a tip portion 381, a first arc portion 382, ​​a side wall portion 383, a second arc portion 384, and a disk portion 385. The tip portion 381 constitutes one end side D of the bottom lid 380 when the compressor 100 is assembled. The first arc portion 382 is a portion that extends in an arc shape from the entire circumference of the other end side U of the tip portion 381. The side wall portion 383 is a portion that extends from the entire circumference of the other end side U of the first arc portion 382 to the other end side U. The second arc portion 384 is a portion that extends in an arc shape from the entire circumference of the other end side U of the side wall portion 383. The disk portion 385 is a portion extending radially from the entire circumference of the second arc portion 384. The tip portion 381, the first arc portion 382, ​​the side wall portion 383, the second arc portion 384, and the disk portion 385 are integrally formed.

[0039] 6 is a flowchart illustrating a method for manufacturing the body 12 of the sealed container 10 according to the first embodiment of the present disclosure. As shown in Fig. 6, the body 12 is manufactured by a winding process S1, a tube shrinking process S2, a butt welding process S3, a tube expansion process S4, an end face processing process S5, a spinning process S6, a punching process S7, and a resistance welding process S8. The body 12 is manufactured by performing the above processes on a rectangular steel plate 300 (see Fig. 7).

[0040] 7 is a perspective view illustrating the shape of the material of the sealed container 10 according to the first embodiment of the present disclosure. As shown in Fig. 7, in the method for manufacturing the sealed container 10, first, a rectangular steel plate 300 is prepared. As the steel plate 300, for example, high-tensile steel or automotive steel plate can be used.

[0041] Fig. 8 is a schematic side view illustrating a winding process S1 in the method for manufacturing the sealed container 10 according to the first embodiment of the present disclosure. As shown in Fig. 8, in the winding process S1, a prepared rectangular steel plate 300 is sandwiched between upper and lower rollers 310 and moves in conjunction with the movement of the rollers 310. In this way, the steel plate 300 is formed into a roll.

[0042] 9 is a schematic side view illustrating a tube-reducing process S2 in the method for manufacturing a sealed container 10 according to the first embodiment of the present disclosure. As shown in FIG. 9 , in the tube-reducing process S2, the rolled steel sheet 300 after winding is set in a mold 320 and pressed. The mold 320 has a cylindrical through-hole 320a and is divided in the axial direction. The pressed steel sheet 300 is processed so that both ends along the axial direction abut against each other.

[0043] 10 is a schematic perspective view illustrating a butt welding step S3 in the manufacturing method of the sealed container 10 according to the first embodiment of the present disclosure. As shown in FIG. 10 , in the butt welding step S3, the butt joint of the joint between both ends of the steel plate 300 along the axial direction is welded with a welding torch 330. The ends of the steel plate 300 are in abutting contact due to having undergone the tube reduction step S2. The rolled steel pipe 340 that has undergone the rolling step S1, the tube reduction step S2, and the butt welding step S3 is subjected to the next tube expansion step S4. The rolled steel pipe 340 is an example of a tubular member.

[0044] 11 is a cross-sectional schematic view illustrating a tube expansion process S4 in the manufacturing method of the sealed container 10 according to the first embodiment of the present disclosure. As shown in FIG. 11 , in the tube expansion process S4, the butt-welded wound steel tube 340 is inserted into a tube expansion jig. A tube expansion die 351 is inserted into the wound steel tube 340. The tube expansion die 351 has a cylindrical shape divided into multiple sections in the circumferential direction. A pyramidal tapered rod 352 is disposed in the center of the tube expansion die 351. When the tapered rod 352 is pressed axially, the tube expansion die 351 is expanded, thereby pressing the wound steel tube 340 from its inner diameter side toward its outer diameter side, expanding it to the desired inner diameter.

[0045] 12 is a schematic perspective view illustrating an end face machining step S5 in the manufacturing method of the sealed container 10 according to the first embodiment of the present disclosure. As shown in FIG. 12, in the end face machining step S5, one end of the expanded rolled steel pipe 340 is machined to a desired length using a lathe or the like. The rolled steel pipe 340 that has undergone the expansion step S4 and the end face machining step S5 is then subjected to the next step, a spinning step S6.

[0046] 13 is a cross-sectional schematic diagram illustrating a spinning process S6 in the manufacturing method of the sealed container 10 according to the first embodiment of the present disclosure. As shown in FIG. 13 , in the spinning process S6, the end of the wound steel tube 340 after the end surface processing process S5 is gripped, and the wound steel tube 340 is rotated while a roller die 360 ​​is pressed against it from the outside on the opposite side to form a curved shape. As a result, a curved portion 341 is formed. The end of the curved portion 341 forms an opening 343.

[0047] Fig. 14 is a cross-sectional view illustrating a punching process S7 in the method for manufacturing the sealed container 10 according to the first embodiment of the present disclosure. Fig. 15 is an enlarged view of a punched portion 373 of the sealed container 10 according to the first embodiment of the present disclosure.

[0048] 14 and 15 , in the punching process S7, a hole is made in the end portion of one end side D of the curved portion 341 of the rolled steel pipe 340 using a punching jig after the spinning process. The hole is made by sandwiching the end portion of one end side D of the curved portion 341 with a punch 371 from the outside and a die 372 from the inside, and punching the periphery of the opening 343 from the outside to the inside. This hole forms the punched portion 373. By punching, a sag 374, a shear surface 375, a fracture surface 376, and a burr 377 are formed on the inner peripheral surface of the punched portion 373 from the outside.

[0049] 16 is a cross-sectional schematic view illustrating a resistance welding step S8 in the manufacturing method of the sealed container 10 according to the first embodiment of the present disclosure. As shown in FIG. 16 , in the resistance welding step S8, a bottom lid 380 is placed on the inside of the punched portion 373 of the curved portion 341 of the punched steel tube 340, i.e., from the side opposite to the side where the sag 374 is formed, and resistance welding is performed. Resistance welding is performed by sandwiching the curved portion 341 between an external electrode 391 from the outside and an internal electrode 392 from the inside, and passing current through them while applying pressure. That is, the entire circumference of the flash 377 and the entire circumference of the second arc portion 384 of the bottom lid 380 are resistance welded together.

[0050] When bottom lid 380 is placed on the inside of punched portion 373, that is, from the side opposite to the side where sag 374 is formed, the entire inner circumference of punched portion 373 and the entire outer circumference of second arc portion 384 of bottom lid 380 are in line contact in a three-dimensional sense. The line contact between punched portion 373 of body 12 and second arc portion 384 of bottom lid 380 stabilizes welding and improves airtightness after welding punched portion 373 and second arc portion 384.

[0051] Resistance welding is a welding method in which electricity is passed through the contact area between one member and another member, applying heat and pressure to melt and join the two members. If the contact area between the two members is limited at the beginning of welding, the electricity flows within a limited area, making it easier to generate heat and melt the two members. By utilizing a burr 377 on one member during resistance welding, the contact area with the other member is reduced, allowing heat to be generated even with a reduced input current. The burr 377 serves as the starting point for the current at the beginning of welding, but melts during the welding process. Upon completion of resistance welding, the portion of the punched portion 373 (one member) from the burr 377 to the fracture surface 376 is melted into the second arc portion 384 of the bottom cover 380 (the other member), making the burr 377 invisible.

[0052] The burr 377 is formed when a gap, i.e., a clearance, is formed between the punch 371 and the die 372 when the punched portion 373 is formed. The presence of the burr 377 facilitates resistance welding and enables the body 12 and the bottom cover 380 to be fixed together. Therefore, in the punching process S7, the clearance between the punch 371 and the die 372 is adjusted so that the burr 377 is formed appropriately.

[0053] When the clearance is increased, the width of the burr 377 increases, and when the clearance is reduced, the width of the burr 377 decreases. The clearance should be set to 8% to 10% of the plate thickness. This makes resistance welding easy and ensures sufficient weld strength in the axial direction.

[0054] Although resistance welding is possible if burrs 377 are present, it is more preferable that the width of the burrs 377 is constant in the circumferential direction, which reduces variations in welding strength in the circumferential direction.

[0055] If the body 12 and the bottom cover 380 are joined using, for example, brazing or arc welding rather than resistance welding, the inner diameter of the body 12 will be tapered due to the effects of welding heat hardening. A tapered inner diameter of the body 12 reduces the inner diameter accuracy of the body 12, which can lead to poor assembly of the compression mechanism 20 and reduced performance of the compressor 100. Furthermore, a tapered inner diameter of the body 12 narrows the internal space of the sealed container 10, restricting assembly of the compression mechanism 20. Furthermore, arc welding requires additional materials because it is performed while melting wire, etc., and the wire melting operation by the worker can lead to an unstable wire supply rate, an unstable wire supply position, and a susceptibility to external disturbances such as wire curl. This can result in reduced airtightness, reduced weld quality (e.g., leakage), and reduced weld strength, potentially increasing manufacturing costs.

[0056] In contrast, in the first embodiment, the entire inner circumference of the punched portion 373 and the second arc portion 384 of the bottom cover 380 are fixed together by resistance welding. This makes the welding more uniform than brazing or arc welding, improving the stability of the welding and improving the airtightness of the hermetic container 10. In addition, because the body 12 and the bottom cover 380 are fixed together by resistance welding rather than brazing or arc welding, the use of brazing material or welding wire can be eliminated, and the hermetic container 10 of the hermetic compressor 100 can be manufactured at low cost.

[0057] Furthermore, a curved portion 341 is formed integrally with the cylindrical portion 342 at one end thereof, and the bottom lid 380 is joined to the end of the curved portion 341 by resistance welding. With this configuration, it is possible to prevent the cylindrical portion from deforming into a tapered shape due to the effects of welding heat hardening, compared to, for example, a configuration in which the bottom lid 380 is joined to the end of a cylindrical member by a welding method other than resistance welding. By forming the curved portion 341 integrally with one end of the cylindrical portion 342, it is possible to prevent the cylindrical portion 342 from deforming into a tapered shape due to the effects of welding heat hardening, thereby stabilizing the inner diameter accuracy of the body 12 and enabling the cylindrical portion 342 to be fixed to the cylinder 23 and the cylindrical portion 342 to the stator 41 in an optimal manner.

[0058] <Modification 1> Fig. 17 is a cross-sectional view of a bottom cover of a sealed container 10 according to Modification 1 of Embodiment 1 of the present disclosure. Fig. 18 is a cross-sectional view of a sealed container 10 according to Modification 1 of Embodiment 1 of the present disclosure.

[0059] 17 and 18 , instead of the hat shape, the bottom lid 480 may be skirt-shaped and have a tip portion 381 and a tapered portion 386. The bottom lid 480 includes the tip portion 381 and the tapered portion 386 formed integrally with the entire circumference of the tip portion 381. The entire inner circumference of the punched portion 373 of the curved portion 341 and the entire outer circumference of the tapered portion 386 are resistance-welded. In other words, the entire circumference of the burr 377 and the entire circumference of the tapered portion 386 are resistance-welded. Even with this configuration, the same effects as in the first embodiment can be obtained.

[0060] Since the entire circumference of the punched portion 373 and the entire circumference of the tapered portion 386 are in line contact in three dimensions, after welding the entire circumference of the punched portion 373 and the entire circumference of the tapered portion 386 together, the welding is stable and the airtightness is improved.

[0061] <Modification 2> Figure 19 is a cross-sectional schematic view illustrating a method for manufacturing a sealed container 10 according to Modification 2 of Embodiment 1 of the present disclosure, illustrating a punching process S7. Figure 20 is an enlarged cross-sectional view illustrating a punching process S7 in a method for manufacturing a sealed container 10 according to Modification 2 of Embodiment 1 of the present disclosure. Figure 21 is a partial cross-sectional view of a sealed container 10 according to Modification 2 of Embodiment 1 of the present disclosure. As shown in Figures 19 to 21 , punching process S7 in Modification 2 is a process of punching from the inside to the outside using a punching jig having a die 372 arranged on the outside and a punch 371 arranged on the inside.

[0062] A sag 374, a shear surface 375, a fracture surface 376, and a burr 377 are formed on the inner peripheral surface of the punched portion 373 from the inside to the outside of the punched portion 373. The bottom lid 380 is not an internal covering but an external covering, that is, resistance welding is performed from the side opposite the sag 374. In other words, the entire circumference of the burr 377 of the body 12 and the entire outer circumference of the second arc portion 384 of the bottom lid 380 are resistance welded together. The bottom lid 380 is, for example, hat-shaped.

[0063] In the second modification, the entire outer circumference of the punched portion 373 and the second arc portion 384 of the bottom lid 380 are fixed by resistance welding. Therefore, the configuration of the second modification also makes the welding more uniform than brazing or arc welding, improving the stability of the welding and improving the airtightness of the sealed container 10. In addition, because the body 12 and the bottom lid 380 are fixed by resistance welding instead of brazing or arc welding, brazing material or welding wire can be eliminated, and the sealed container 10 of the hermetic compressor 100 can be manufactured at low cost.

[0064] Furthermore, a curved portion 341 is formed integrally with the cylindrical portion 342 at one end thereof, and the bottom lid 380 is joined to the end of the curved portion 341 by resistance welding. With this configuration, it is possible to prevent the cylindrical portion from deforming into a tapered shape due to the effects of welding heat hardening, compared to, for example, a configuration in which the bottom lid 380 is joined to the end of a cylindrical member by a welding method other than resistance welding. By forming the curved portion 341 integrally with one end of the cylindrical portion 342, it is possible to prevent the cylindrical portion 342 from deforming into a tapered shape due to the effects of welding heat hardening, and therefore it is possible to preferably fix the cylindrical portion 342 to the cylinder 23 and the cylindrical portion 342 to the stator 41.

[0065] <Modification 3> Fig. 22 is a partial cross-sectional view of a sealed container 10 according to Modification 3 of Embodiment 1 of the present disclosure. As shown in Fig. 22, the sealed container 10 has a configuration in which the entire outer circumference of the punched portion 373 and a tapered portion 386 of a skirt-shaped bottom lid 480 are fixed by resistance welding. Even when the bottom lid 480 has a skirt shape, the entire circumference of the flash 377 of the body 12 can be resistance welded to the outer side of the tapered portion 386 of the bottom lid 480.

[0066] <Modification 4> Fig. 23 is a partial cross-sectional view of a sealed container 10 according to Modification 4 of the first embodiment of the present disclosure. As shown in Fig. 23, a bottom lid 580 is integral with compressor legs 387, and is resistance-welded from the outer covering of the bottom lid 580. More specifically, the bottom lid 580 has, for example, a skirt shape and includes a tip portion 381 and a tapered portion 386 integrally formed around the entire circumference of the tip portion 381. Compressor legs 387 are integrally formed around the outer periphery of the tapered portion 386. Note that the bottom lid 580 may be hat-shaped. In this case, the compressor legs 387 are integrally formed around the outer periphery of the disk portion 385.

[0067] In the punching process S7, a punching jig having a die 372 on the outside and a punch 371 on the inside punches the punched portion 373 from the inside to the outside. In this case, a sag 374, a shear surface 375, a fracture surface 376, and a burr 377 are formed on the inner peripheral surface of the punched portion 373 from the inside to the outside of the punched portion 373. The bottom lid 580 is not an internal covering but an external covering, that is, resistance welding is performed from the side opposite the sag 374. The entire outer circumference of the punched portion 373 and the entire circumference of the tapered portion 386 of the bottom lid 580 are resistance welded. In other words, the entire circumference of the burr 377 and the entire circumference of the tapered portion 386 are resistance welded. In this way, by fixing the bottom lid 580 to the body 12 by resistance welding, the welded portion is stabilized, resulting in a sealed container 10 that maintains airtightness, and the configuration in which the compressor legs 387 are integrated with the bottom lid 580 contributes to a reduction in the number of parts and processes.

[0068] In the first embodiment, a single rotary compressor has been described as the compressor 100, but the compressor 100 may be a twin rotary compressor. Regarding the compression mechanism 20, a rotary compression mechanism 20 has been described, but various mechanisms such as a scroll type or a screw type may be employed. Furthermore, a multi-stage compressor 100 may be employed in which a plurality of compression mechanisms 20 are installed and the refrigerant is compressed sequentially.

[0069] According to the sealed container 10 according to the first embodiment described above, a punched portion 373 is formed on one end D of the body 12 by punching with a punch 371 and a die 372, and the bottom lid 380 is fixed by resistance welding along the entire inner periphery of the punched portion 373. This improves the welding stability between the punched portion 373 and the bottom lid 380, thereby improving the airtightness of the sealed container 10. Furthermore, since the seal is less susceptible to the effects of welding heat hardening, the inner diameter accuracy is stable, and the assembly of the compression mechanism 20 is improved. Furthermore, deterioration of welding quality, such as leakage due to disturbances such as welding wire curl, which occurs in arc welding, can also be suppressed.

[0070] Furthermore, bottom cover 380 includes second arc portion 384, and the entire inner circumference of punched portion 373 and the entire outer circumference of second arc portion 384 are resistance-welded, so that resistance welding can be performed in a three-dimensional line contact state. Therefore, after resistance welding, the airtightness between the entire inner circumference of punched portion 373 and the entire circumference of second arc portion 384 of bottom cover 380 can be improved.

[0071] Furthermore, bottom lid 480 includes tapered portion 386, and the entire inner circumference of punched portion 373 is resistance-welded to the entire circumference of tapered portion 386, so that resistance welding can be performed in a three-dimensional line contact state. Therefore, after resistance welding, the airtightness between the entire inner circumference of punched portion 373 and the entire circumference of tapered portion 386 of bottom lid 480 can be improved.

[0072] The punched portion 373 is punched out using a punch 371 and a die 372 so as to form a sag 374 and a shear surface 375 from the inside to the outside of the inner circumferential surface, and the entire outer periphery of the punched portion 373 is fixed to the bottom cover 380 by resistance welding. This improves welding stability and airtightness.

[0073] Furthermore, the punched portion 373, which is punched out so as to form the sag 374 and shear surface 375 from the inside to the outside, has its entire outer periphery resistance-welded to the entire periphery of the second arc portion 384, and can be welded in a line contact state in a three-dimensional sense. This makes it possible to improve the airtightness between the entire outer periphery of the punched portion 373 and the entire periphery of the second arc portion 384 of the bottom cover 380 after resistance welding.

[0074] In addition, the bottom cover 580 has a disk portion 385 formed integrally around the entire circumference of the second arc portion 384, and the compressor leg portion 387 is formed integrally with the disk portion 385, thereby reducing the number of parts of the compressor 100.

[0075] The bottom lid 480 also includes a tapered portion 386, and the entire outer circumference of the punched portion 373 and the entire circumference of the tapered portion 386 are resistance-welded to each other in a three-dimensional line contact state. Therefore, after the resistance welding, the airtightness between the entire outer circumference of the punched portion 373 and the entire circumference of the tapered portion 386 of the bottom lid 480 can be improved.

[0076] Furthermore, the bottom cover 580 includes a tapered portion 386, and the compressor legs 387 are formed integrally with the tapered portion 386 on the outer periphery of the tapered portion 386, thereby reducing the number of parts.

[0077] Furthermore, the compressor 100 according to the first embodiment is configured such that the electric motor 30 and the compression mechanism 20 are housed in the sealed container 10, and the compression mechanism 20 compresses the refrigerant drawn in from outside the sealed container 10. The sealed container 10 is manufactured using resistance welding, and therefore the compressor 100 can be obtained with improved airtightness, stable inner diameter accuracy, less refrigerant leakage, and reduced deterioration in assembly.

[0078] Furthermore, due to the improved airtightness of the compressor 100, safety can be ensured even when a slightly flammable refrigerant is used in the compressor 100.

[0079] Furthermore, since the refrigeration cycle device 200 according to embodiment 1 is equipped with a sealed container 10 and a compressor 100 with improved sealing performance, it is possible to obtain a refrigeration cycle device 200 with a reduced risk of refrigerant leakage.

[0080] The method for manufacturing the sealed container 10 according to the first embodiment includes a spinning process S6, a punching process S7, and a resistance welding process S8, in which the bottom cover 380 is fixed by resistance welding to the entire periphery of the burr 377 of the punched portion 373 formed by punching. This makes it possible to increase the welding stability of the compressor 100, and improve the airtightness of the compressor 100.

[0081] Furthermore, in the resistance welding step S8, the entire circumference of the burr 377 and the entire circumference of the second arc portion 384 can be resistance-welded in a three-dimensional line contact state. Therefore, after the resistance welding, the airtightness between the entire outer circumference of the punched portion 373 and the entire circumference of the second arc portion 384 of the bottom cover 380 can be improved.

[0082] Furthermore, in the resistance welding step S8, the entire circumference of the burr 377 and the entire circumference of the tapered portion 386 can be resistance-welded in a three-dimensional line contact state, which improves the airtightness of the entire outer circumference of the punched portion 373 and the entire circumference of the tapered portion 386 of the bottom cover 480 after the resistance welding.

[0083] 10 Sealed container, 11 Upper cover, 12 Body, 20 Compression mechanism, 21 Rotating shaft, 21a Main shaft portion, 21b Eccentric shaft portion, 21c Sub-shaft portion, 22 Rolling piston, 23 Cylinder, 23a Cylinder chamber, 23b Back pressure chamber, 23c Vane groove, 24 Upper bearing, 25 Lower bearing, 26 Vane, 27 Discharge muffler, 30 Electric motor, 31 Rotor, 32 Rotor core, 33 Magnet insertion hole, 34 Permanent magnet, 35 Air hole, 41 Stator, 100 Compressor, 101 Intake muffler, 102 Discharge pipe, 103 Four-way switching valve, 104 Outdoor heat exchanger, 105 Pressure reducer, 106 Indoor heat exchanger, 200 Refrigeration cycle device, 300 Steel plate, 310 Roller, 320 Die, 320a: through hole, 330: welding torch, 340: wound steel pipe, 341: curved portion, 342: cylindrical portion, 343: opening, 351: tube expansion die, 352: tapered rod, 360: roller die, 371: punch, 372: die, 373: punched portion, 374: sag, 375: shear surface, 376: fracture surface, 377: burr, 380: bottom lid, 381: tip portion, 382: first arc portion, 383: side wall portion, 384: second arc portion, 385: disk portion, 386: tapered portion, 387: compressor leg portion, 391: outer electrode, 392: inner electrode, 480: bottom lid, 580: bottom lid.

Claims

1. A sealed container for a compressor, comprising: a cylindrical body; and a lid provided at one end of the body in the axial direction, wherein the body comprises a curved portion formed integrally with the one end and formed with a convex curve, and to which the lid is fixed, the curved portion comprising a punched portion formed at the one end by punching with a punch and die, the inner peripheral surface of the punched portion having sagging and shear surfaces extending from the outside to the inside of the punched portion, and the lid is fixed around the entire inner circumference of the punched portion by resistance welding.

2. A hermetic container for a compressor according to claim 1, wherein the lid comprises: a tip portion located on the one end side; a first arc portion formed integrally around the entire circumference of the tip portion; a side wall portion formed integrally around the entire circumference of the first arc portion and extending from the entire circumference of the first arc portion to the other end side; a second arc portion formed integrally around the entire circumference of the other end side of the side wall portion; and a disk portion formed integrally around the entire circumference of the other end side of the second arc portion, wherein the entire inner circumference of the punched-out portion of the body and the entire outer circumference of the second arc portion are resistance welded together.

3. A hermetic container for a compressor according to claim 1, wherein the lid comprises a tip portion located on the one end side and a tapered portion formed integrally with the tip portion so as to extend from the entire circumference of the tip portion to the other end side, and the entire inner circumference of the punched portion and the entire outer circumference of the tapered portion are resistance welded together.

4. A sealed container for a compressor, comprising: a cylindrical body; and a lid provided at one end of the body in the axial direction, wherein the body comprises: a cylindrical portion; and a curved portion integrally formed at the one end of the cylindrical portion and formed with a convex curve, the curved portion comprising a punched portion at the one end formed by punching with a punch and a die, the inner surface of the punched portion having sagging and shear surfaces extending from the inside to the outside of the punched portion, and the lid being fixed around the entire outer circumference of the punched portion by resistance welding.

5. A hermetic container for a compressor according to claim 4, wherein the lid comprises: a tip portion located on the one end side; a first arc portion formed integrally around the entire circumference of the tip portion; a side wall portion formed integrally around the entire circumference of the first arc portion; a second arc portion formed integrally around the entire circumference of the side wall portion; and a disk portion formed integrally around the entire circumference of the second arc portion, and the entire outer circumference of the punched portion and the entire circumference of the second arc portion are resistance welded together.

6. A hermetic container for a compressor according to claim 5, wherein the cover has compressor legs integrally formed on the outer periphery of the disk portion.

7. A hermetic container for a compressor according to claim 4, wherein the lid comprises a tip portion located on the one end side and a tapered portion formed integrally with the entire periphery of the tip portion, and the entire outer periphery of the punched portion and the entire periphery of the tapered portion are resistance welded together.

8. A hermetic container for a compressor according to claim 7, wherein the lid has compressor legs integrally formed on the outer periphery of the tapered portion.

9. A compressor comprising: a sealed container for a compressor according to any one of claims 1 to 8; an electric motor arranged within the sealed container; and a compression mechanism arranged within the sealed container, driven by the electric motor, and configured to compress a refrigerant drawn in from outside the sealed container.

10. The compressor according to claim 9, wherein the refrigerant used in the compressor is any one of R1234yf, R1234ze, R32, and R290 alone, or a mixture of two or more of these, or a mixture of any one of these with another refrigerant, or a mixed refrigerant containing R1132(E), or a mixed refrigerant containing R1123.

11. A refrigeration cycle device comprising: a compressor according to claim 9 or 10; an outdoor heat exchanger; a pressure reducer; and an indoor heat exchanger.

12. A method for manufacturing a sealed container for a compressor having a cylindrical body and a lid provided at one axial end of the body, comprising: a spinning process for forming the body by spinning the one end of the cylindrical member to have a cylindrical portion and a curved portion that is integrally formed at the one end of the cylindrical portion and is formed with a convex curve, with an opening formed at the end of the curved portion; a punching process for forming a punched portion by punching the periphery of the opening with a punch and a die, and forming a sag, shear surface, fracture surface, and burr on the inner surface of the punched portion from the outside to the inside of the punched portion in that order; and a resistance welding process for resistance welding the lid provided at the one end of the body to the entire circumference of the burr.

13. A method for manufacturing a sealed container for a compressor having a cylindrical body and a lid provided at one axial end of the body, comprising: a spinning process for forming the body by spinning the one end of the cylindrical member to have a cylindrical portion and a curved portion that is integrally formed at the one end of the cylindrical portion and is formed with a convex curve, with an opening formed at the end of the curved portion; a punching process for forming a punched portion by punching the periphery of the opening with a punch and a die, and forming a sag, shear surface, fracture surface, and burr on the inner surface of the punched portion in that order from the inside to the outside of the punched portion; and a resistance welding process for resistance welding the lid provided at the one end of the body to the entire circumference of the burr.

14. A method for manufacturing a sealed container for a compressor as set forth in claim 12 or claim 13, wherein the lid body comprises: a tip portion located on the one end side; a first arc portion formed integrally around the entire circumference of the tip portion; a side wall portion formed integrally around the entire circumference of the first arc portion and extending from the entire circumference of the first arc portion to the other end side; a second arc portion formed integrally around the entire circumference of the other end side of the side wall portion; and a disk portion formed integrally around the entire circumference of the other end side of the second arc portion; and the resistance welding process resistance-welds the entire circumference of the burr and the entire circumference of the second arc portion.

15. A method for manufacturing a sealed container for a compressor as set forth in claim 12 or claim 13, wherein the lid body comprises a tip portion located on the one end side and a tapered portion formed integrally with the tip portion so as to extend from the entire circumference of the tip portion to the other end side, and the resistance welding step resistance-welds the entire circumference of the burr to the entire circumference of the tapered portion.