Compressor, refrigeration device, and method for assembling compressor

Abstract

The tensile stress that is generated when welding a lid part and a body part of a casing may pull the body part and the lid part in a specific direction, resulting in variations in dimensions after assembly. A casing (10) of a scroll compressor (101) has a body part (11), a lower lid part (13), and a weld part (14). The body part (11) has a first end surface (11a), a cutout part (21), a cutout end surface (21a), and a first end part (11d). The cutout part (21) is formed on the outer peripheral side of the first end surface (11a). The cutout end surface (21a) is a surface of an inner side of the cutout part (21). The lower lid part (13) has an inclined surface (13b2) and a third end surface (13a). The inclined surface (13b2) is an inner peripheral side surface that is inclined in relation to the axial direction. The first end part (11d) is in contact with the inclined surface (13b2). The cutout end surface (21a) is in contact with the third end surface (13a). The outer peripheral edge of the third end surface (13a) is positioned closer to the outer peripheral side than the outer peripheral edge of the cutout end surface (21a). The weld part (14) joins the outer peripheral surface of the body part (11) and the third end surface (13a).

Description

Compressor, refrigeration device, and compressor assembly method

[0001] The present invention relates to a compressor, a refrigeration device, and a method for assembling a compressor.

[0002] Conventionally, hermetic compressors have been known that include a casing formed by welding a cylindrical body portion and a dome-shaped lid portion. For example, in a compressor disclosed in Patent Document 1 (WO 2018 / 138772), the casing is formed by welding the outer circumferential surface of the body portion and the end face of the lid portion together, with the end face of the body portion contacting a stepped surface of a notch formed on the inner circumferential side of the edge of the lid portion. In this case, tensile stress generated at the welded portion during welding pulls the body portion and the lid portion toward the welded portion.

[0003] When assembling the compressor described above, a predetermined radial gap must be formed between the body portion and the cover portion before welding. However, if tensile stress generated at the welded portion pulls the body portion and the cover portion in a specific direction, the body portion may tilt after assembly, or dimensional variations may occur after assembly. Furthermore, if the gap before welding is designed to be small in order to suppress variations, high dimensional accuracy is required, which may increase costs.

[0004] A compressor according to a first aspect includes a compression mechanism, a motor, and a casing. The compression mechanism compresses a refrigerant. The motor drives the compression mechanism. The casing houses the compression mechanism and the motor. The casing has a body portion, a lid portion, and a weld portion. The body portion has a cylindrical shape. The lid portion has a dome shape. The weld portion joins the body portion and the lid portion. The body portion has a first end face, a cutout portion, a second end face, and a first end portion. The first end face is an axial end face of the cylindrical shape of the body portion. The cutout portion is formed on the outer periphery of the first end face. The second end face is an inner surface of the cutout portion and is an end face along the radial direction of the cylindrical shape. The first end portion is a portion from the first end face to the second end face in the axial direction. The lid portion has a first side surface and a third end face. The first side surface is an inner peripheral surface inclined with respect to the axial direction. The third end surface is an end surface along the radial direction. The first end portion contacts the first side surface. The second end surface contacts the third end surface. The outer peripheral edge of the third end surface is located more radially outward than the outer peripheral edge of the second end surface. The weld joins the outer peripheral surface of the trunk portion and the third end surface.

[0005] In the compressor of the first aspect, the body portion and the cover portion of the casing are positioned axially by contact between the end face (second end face) of the body portion and the end face (third end face) of the cover portion during welding, and are positioned radially by contact between the end portion (first end face) of the body portion and the inner inclined surface (first side face) of the cover portion, thereby reducing dimensional variation of the compressor after assembly.

[0006] A compressor according to a second aspect is the compressor according to the first aspect, wherein the ratio of the axial dimension of the first end to the radial dimension of the first end is 3:2 to 10:1.

[0007] In the compressor of the second aspect, the axial dimension of the end (first end) of the body portion is sufficiently longer than the radial dimension. Therefore, when the end (first end) of the body portion and the inner inclined surface (first side surface) of the lid portion come into contact during welding, the end (first end) of the body portion can easily deform. This reduces variation in the radial dimension of the assembled compressor.

[0008] A compressor according to a third aspect is the compressor according to the first or second aspect, wherein the body portion has cutout portions formed on both sides in the axial direction.

[0009] A compressor according to a fourth aspect is the compressor according to any one of the first to third aspects, wherein the first end portion has a portion that extends along the first side surface.

[0010] In the compressor of the fourth aspect, when the end (first end) of the body portion and the inner inclined surface (first side surface) of the lid portion come into contact with each other during welding, the end (first end) of the body portion can easily deform along the inner inclined surface (first side surface) of the lid portion, thereby reducing variation in the radial dimension of the assembled compressor.

[0011] A compressor according to a fifth aspect is the compressor according to any one of the first to fourth aspects, wherein the first end has a corner that contacts the first side surface. The corner is chamfered.

[0012] In the compressor of the fifth aspect, when the end (first end) of the body portion and the inner inclined surface (first side surface) of the lid portion come into contact with each other during welding, the end (first end) of the body portion can be easily deformed, thereby reducing variation in the radial dimension of the assembled compressor.

[0013] A compressor according to a sixth aspect is the compressor according to any one of the first to fifth aspects, wherein the cover portion has a second side surface. The second side surface is an inner peripheral surface located between the third end surface and the first side surface in the axial direction. The second side surface faces an inner surface of the cutout portion.

[0014] In the compressor of the sixth aspect, a radial gap is formed between the body portion and the cover portion before welding. Therefore, when an end (first end) of the body portion and an inner inclined surface (first side surface) of the cover portion come into contact during welding, the end (first end) of the body portion can easily deform. This reduces variation in the radial dimension of the assembled compressor.

[0015] A refrigeration apparatus according to a seventh aspect includes the compressor according to any one of the first to sixth aspects, and a refrigerant circuit through which refrigerant compressed by the compressor flows.

[0016] A compressor assembly method according to an eighth aspect is the compressor assembly method according to any one of the first to sixth aspects, and includes a first step and a second step. In the first step, the body and the lid are positioned so that the second end surface of the body contacts the third end surface of the lid and the first end portion of the body contacts the first side surface of the lid. In the second step, the outer peripheral surface of the body and the third end surface of the lid are joined by welding to form a weld.

[0017] In the compressor assembling method of the eighth aspect, the body portion and the cover portion of the casing are positioned axially by contact between the end face (second end face) of the body portion and the end face (third end face) of the cover portion during welding, and are positioned radially by contact between the end portion (first end face) of the body portion and the inner inclined surface (first side face) of the cover portion, thereby suppressing dimensional variation of the compressor after assembly.

[0018] 1 is a refrigerant circuit diagram of a refrigeration device 100 of an embodiment. A longitudinal sectional view of a scroll compressor 101. A sectional view showing the A-A section of the casing 10 of FIG. 2. A sectional view showing the B-B section of the body portion 11 and the lower cover portion 13 of FIG. 3. A partial sectional view of the body portion 11 and the lower cover portion 13 after joining. A partial sectional view of the body portion 11 of FIG. 4 before joining. A partial sectional view of the lower cover portion 13 of FIG. 4 before joining. A partial sectional view of the body portion 11 and the upper cover portion 12 of modified example A after joining. A partial sectional view of the body portion 11 of modified example B before joining.

[0019] (1) Overall Configuration As shown in FIG. 1 , a scroll compressor 101, which is one embodiment of the compressor of the present disclosure, is provided in a refrigeration system 100. The refrigeration system 100 utilizes a vapor compression refrigeration cycle. The refrigeration system 100 is, for example, an air conditioner or a hot water supply system. The refrigeration system 100 includes a refrigerant circuit 110 filled with refrigerant. The refrigerant circuit 110 includes the scroll compressor 101, a radiator 102, a pressure reduction mechanism 103, and a heat absorber 104. The radiator 102 and the heat absorber 104 are heat exchangers. The pressure reduction mechanism 103 is, for example, an expansion valve.

[0020] The scroll compressor 101 is a hermetic compressor. The scroll compressor 101 draws in low-pressure refrigerant in a refrigeration cycle, compresses the drawn refrigerant, and discharges high-pressure refrigerant in the refrigeration cycle. The refrigerant discharged from the scroll compressor 101 flows through a refrigerant circuit 110 along the arrows shown in Figure 1 and is drawn in again.

[0021] As shown in FIG. 2 , the scroll compressor 101 includes a casing 10, a compression mechanism 15, a housing 23, an Oldham coupling 39, a motor 16, a lower bearing 60, a crankshaft 17, a suction pipe 19, and a discharge pipe 20.

[0022] (1-1) Casing 10 The casing 10 has a body 11, an upper lid 12, and a lower lid 13. The body 11 has a cylindrical shape. The upper lid 12 has a dome shape. The lower lid 13 has a dome shape. Hereinafter, the axial direction of the cylindrical shape of the body 11 will be simply referred to as the "axial direction," and the radial direction of the cylindrical shape of the body 11 will be simply referred to as the "radial direction." The casing 10 is arranged so that the axial direction is approximately vertical and the radial direction is approximately horizontal.

[0023] An axially upper opening of the body portion 11 is airtightly joined by welding to an opening of the upper cover portion 12. An axially lower opening of the body portion 11 is airtightly joined by welding to an opening of the lower cover portion 13. As a result, the casing 10 has a sealed internal space surrounded by the body portion 11, the upper cover portion 12, and the lower cover portion 13.

[0024] The internal space of the casing 10 accommodates the compression mechanism 15, the housing 23, the Oldham coupling 39, the motor 16, the lower bearing 60, and the crankshaft 17. An intake pipe 19 and a discharge pipe 20 are airtightly joined to the casing 10 by welding.

[0025] An oil reservoir space 10a, which is a space for storing lubricating oil, is formed at the bottom of the internal space of the casing 10. The lubricating oil is refrigerating machine oil used to maintain good lubrication of the compression mechanism 15, the crankshaft 17, etc. during operation of the scroll compressor 101.

[0026] The details of the shape of the casing 10 and the assembly process of the casing 10 will be described later.

[0027] (1-2) Compression Mechanism 15 The compression mechanism 15 draws in and compresses low-temperature, low-pressure refrigerant gas flowing through the refrigerant circuit 110, and discharges the high-temperature, high-pressure refrigerant gas into the refrigerant circuit 110. Hereinafter, the compressed refrigerant discharged from the compression mechanism 15 will be referred to as "compressed refrigerant."

[0028] The compression mechanism 15 has a fixed scroll 24 and a movable scroll 26. The fixed scroll 24 is fixed to the inner circumferential surface of the casing 10. The movable scroll 26 performs an orbiting motion to orbit relative to the fixed scroll 24.

[0029] The fixed scroll 24 has a fixed side end plate 24a, a fixed side wrap 24b, and an outer peripheral wall 24c. The fixed side end plate 24a has a disk shape. The fixed side wrap 24b has a spiral shape when viewed vertically. The outer peripheral wall 24c has a cylindrical shape when viewed vertically. The outer peripheral wall 24c is provided on the outer edge of the lower surface of the fixed side end plate 24a. The fixed side wrap 24b is provided on the lower surface of the fixed side end plate 24a, inside the outer peripheral wall 24c. When viewed vertically, the fixed side wrap 24b extends from a winding start located in the center of the fixed side end plate 24a to a winding end that connects to the outer peripheral wall 24c.

[0030] The movable scroll 26 has a movable side end plate 26a, a movable side wrap 26b, and an upper end bearing 26c. The movable side end plate 26a has a disk shape. The movable side wrap 26b has a spiral shape when viewed vertically. The upper end bearing 26c has a cylindrical shape. The movable side wrap 26b is provided on the upper surface of the movable side end plate 26a. The upper end bearing 26c is provided in the center of the lower surface of the movable side end plate 26a. When viewed vertically, the movable side wrap 26b extends from the start of the winding, which is located in the center of the movable side end plate 26a, to the end of the winding, which is located outside the movable side end plate 26a. A bearing metal is arranged inside the upper end bearing 26c.

[0031] The compression mechanism 15 forms a compression chamber 40. The compression chamber 40 is formed between the fixed scroll 24 and the movable scroll 26. The fixed scroll 24 and the movable scroll 26 are arranged so that the fixed wrap 24b and the movable wrap 26b mesh with each other. The lower surface of the outer peripheral wall 24c of the fixed scroll 24 faces the movable scroll 26. The upper surface of the movable end plate 26a of the movable scroll 26 faces the fixed scroll 24. While the movable scroll 26 orbits, the lower surface of the outer peripheral wall 24c slides against the upper surface of the movable end plate 26a.

[0032] A suction port 24d is formed in the fixed scroll 24. The suction port 24d opens near the end of the fixed-side wrap 24b. The downstream end of the suction pipe 19 is connected to the suction port 24d. The suction port 24d communicates with the compression chamber 40.

[0033] A discharge valve 42 that opens and closes a discharge port 41 is attached to the upper surface of the fixed end plate 24a of the fixed scroll 24. The discharge port 41 vertically passes through the center of the fixed end plate 24a. A discharge space 41a is formed above the discharge port 41. The discharge port 41 communicates between the compression chamber 40 and the discharge space 41a.

[0034] (1-3) Housing 23 The housing 23 is disposed below the compression mechanism 15 and above the motor 16. The housing 23 mounts the fixed scroll 24, and sandwiches the movable scroll 26 between the fixed scroll 24 and the housing 23. The outer peripheral surface of the housing 23 is airtightly joined to the inner peripheral surface of the body portion 11.

[0035] The internal space of the casing 10 is divided into a high-pressure space 71, an intermediate-pressure space 72, and a low-pressure space 73. The high-pressure space 71 is the space below the housing 23. The intermediate-pressure space 72 is the space above the housing 23 and is a space surrounded by the housing 23, the fixed scroll 24, and the movable scroll 26. The low-pressure space 73 is the space above the housing 23 and above the fixed scroll 24.

[0036] The intermediate pressure space 72 communicates with the compression chamber 40 in the middle of compression via a hole (not shown) formed in the movable side end plate 26a while the orbiting movable scroll 26 makes one rotation. The pressure in the compression chamber 40 in the middle of compression is higher than the pressure of the refrigerant before it is compressed in the compression chamber 40, but lower than the pressure of the compressed refrigerant. Therefore, the pressure in the intermediate pressure space 72 is lower than the pressure in the high pressure space 71. The pressure in the intermediate pressure space 72 is also higher than the pressure in the low pressure space 73. The pressure of the refrigerant in the intermediate pressure space 72 presses the orbiting movable scroll 26 against the fixed scroll 24.

[0037] A recess called a crank chamber 23a is formed in the upper surface of the housing 23. A housing through-hole 31 is formed in the housing 23. The housing through-hole 31 is a hole that passes vertically through the housing 23 from the center of the bottom surface of the crank chamber 23a to the center of the lower surface of the housing 23. Hereinafter, a part of the housing 23 that surrounds the housing through-hole 31 will be referred to as an upper bearing 32. A bearing metal is disposed inside the upper bearing 32.

[0038] (1-4) Oldham Coupling 39 The Oldham coupling 39 is a member for suppressing rotation of the orbiting movable scroll 26. The Oldham coupling 39 is disposed in the intermediate pressure space 72 between the movable scroll 26 and the housing 23.

[0039] (1-5) Motor 16 The motor 16 is disposed below the housing 23. The motor 16 has a stator 51 and a rotor 52.

[0040] The stator 51 has a stator core 51a and a plurality of coils 51b. The stator core 51a is a cylindrical member fixed to the inner circumferential surface of the casing 10. The stator core 51a has a plurality of teeth (not shown). The coils 51b are formed by winding wire around the teeth.

[0041] A plurality of core cuts 51c are formed on the outer peripheral surface of the stator core 51a. The core cuts 51c are grooves formed in the vertical direction from the upper end surface to the lower end surface of the stator core 51a.

[0042] The rotor 52 is a cylindrical member disposed inside the stator core 51a. An air gap is formed between the inner peripheral surface of the stator core 51a and the outer peripheral surface of the rotor 52. The rotor 52 is coupled to the crankshaft 17. The rotor 52 is connected to the compression mechanism 15 via the crankshaft 17. The rotor 52 rotates the crankshaft 17 around the rotary shaft 16a. The rotary shaft 16a passes through the central axis of the rotor 52.

[0043] The motor 16 functions as a power source for rotating the movable scroll 26 via the rotation of the crankshaft 17 to compress the gas refrigerant in the compression chamber 40 .

[0044] (1-6) Lower Bearing 60 The lower bearing 60 is disposed below the motor 16. The outer peripheral surface of the lower bearing 60 is joined to the inner peripheral surface of the casing 10. A bearing metal is disposed inside the lower bearing 60.

[0045] (1-7) Crankshaft 17 The crankshaft 17 is disposed along the vertical direction. The axis of the upper end of the crankshaft 17 is eccentric with respect to the axis of the remaining portion of the crankshaft 17 excluding the upper end. The crankshaft 17 has a balance weight 18. The balance weight 18 is fixed in close contact with the crankshaft 17 at a height position below the housing 23 and above the motor 16.

[0046] The crankshaft 17 passes vertically through the rotation center of the rotor 52 and is connected to the rotor 52. The upper end of the crankshaft 17 is fitted into the upper end bearing 26c of the movable scroll 26. This connects the crankshaft 17 to the movable scroll 26, so that the rotation of the crankshaft 17 is transmitted to the movable scroll 26. The crankshaft 17 is rotatably supported by bearing metals in the upper end bearing 26c, the upper bearing 32, and the lower bearing 60, respectively.

[0047] A main oil supply passage 61 is formed inside the crankshaft 17. The main oil supply passage 61 extends along the rotational axis of the crankshaft 17. The upper end of the main oil supply passage 61 communicates with an oil chamber 83, which is the space between the upper end surface of the crankshaft 17 and the lower surface of the movable-side end plate 26a. The lower end of the main oil supply passage 61 communicates with the oil reservoir space 10a.

[0048] The crankshaft 17 has a first auxiliary oil supply passage 61a, a second auxiliary oil supply passage 61b, and a third auxiliary oil supply passage 61c branching off from the main oil supply passage 61. The first auxiliary oil supply passage 61a opens into a first sliding portion between the crankshaft 17 and the bearing metal on the inside of the lower bearing 60. The second auxiliary oil supply passage 61b opens into a second sliding portion between the crankshaft 17 and the bearing metal on the inside of the upper bearing 32. The third auxiliary oil supply passage 61c opens into a third sliding portion between the crankshaft 17 and the bearing metal on the inside of the upper end bearing 26c.

[0049] (1-8) Suction Pipe 19 The suction pipe 19 is a pipe for introducing refrigerant from the refrigerant circuit from the outside of the casing 10 to the compression mechanism 15. The suction pipe 19 passes vertically through the upper lid portion 12 of the casing 10. Inside the casing 10, an end of the suction pipe 19 is fitted into the suction port 24d of the fixed scroll 24.

[0050] (1-9) Discharge Pipe 20 The discharge pipe 20 is a pipe for discharging compressed refrigerant from the high-pressure space 71 to the outside of the casing 10. The discharge pipe 20 passes horizontally through the body portion 11 of the casing 10. Inside the casing 10, the end of the discharge pipe 20 is located above the motor 16 and in the high-pressure space 71 below the housing 23.

[0051] (2) Operation of the Scroll Compressor 101 When the motor 16 is driven, the crankshaft 17 connected to the rotor 52 of the motor 16 rotates. The rotational movement of the crankshaft 17 causes the movable scroll 26 to orbit around the rotation axis 16a of the crankshaft 17. As a result, the movable scroll 26 orbits relative to the fixed scroll 24. While the movable scroll 26 orbits, its rotation is suppressed by the Oldham coupling 39.

[0052] (2-1) Flow of Refrigerant The scroll compressor 101 compresses low-pressure refrigerant flowing through the refrigerant circuit 110 and discharges the compressed refrigerant. The refrigerant before compression passes through the suction pipe 19 and the suction port 24d and is supplied to the compression chamber 40 of the compression mechanism 15. The orbiting motion of the movable scroll 26 reduces the volume of the compression chamber 40 to which the refrigerant before compression is supplied. Therefore, in the compression chamber 40, the refrigerant is compressed to become compressed refrigerant. In the process of compressing the refrigerant, the compression chamber 40 becomes a compression chamber 40 in the middle of compression. During one rotation of the orbiting movable scroll 26, the compression chamber 40 in the middle of compression communicates with the intermediate-pressure space 72.

[0053] The compressed refrigerant is discharged from the compression chamber 40 to the discharge space 41a through the discharge port 41. The compressed refrigerant in the discharge space 41a passes through a passage (not shown) formed in the fixed scroll 24 and the housing 23, and is supplied to the high-pressure space 71. The compressed refrigerant supplied to the high-pressure space 71 passes through the discharge pipe 20 and is discharged to the refrigerant circuit 110 outside the scroll compressor 101.

[0054] (2-2) Flow of Lubricating Oil When compressed refrigerant is supplied to the high-pressure space 71, the pressure in the high-pressure space 71 increases. As a result, the lubricating oil stored in the oil reservoir space 10a of the high-pressure space 71 becomes high-pressure and rises up the main oil supply passage 61. A portion of the lubricating oil rising up the main oil supply passage 61 flows through the first auxiliary oil supply passage 61a and is supplied to the first sliding portion. A portion of the lubricating oil rising up the main oil supply passage 61 flows through the second auxiliary oil supply passage 61b and is supplied to the second sliding portion. A portion of the lubricating oil rising up the main oil supply passage 61 flows through the third auxiliary oil supply passage 61c and is supplied to the third sliding portion. The lubricating oil that has lubricated the first sliding portion flows into the high-pressure space 71. The lubricating oil that has lubricated the second sliding portion flows into the high-pressure space 71 and the crank chamber 23a. The lubricating oil that has lubricated the third sliding portion flows into the crank chamber 23a.

[0055] The lubricating oil that flows into the high-pressure space 71 from the first and second sliding parts returns to the oil sump space 10a. A portion of the lubricating oil that flows into the crank chamber 23a from the second and third sliding parts passes through a passage (not shown) formed in the housing 23, flows into the high-pressure space 71, and returns to the oil sump space 10a. Most of the lubricating oil that flows into the crank chamber 23a passes through a passage (not shown), seals the sliding portion between the lower surface of the outer peripheral wall 24c of the fixed scroll 24 and the upper surface of the movable-side end plate 26a, and flows into the compression chamber 40. The lubricating oil that flows into the compression chamber 40 is mixed into the compressed refrigerant in the form of tiny oil droplets, flows into the high-pressure space 71 together with the compressed refrigerant, and returns to the oil sump space 10a.

[0056] (3) Details of the Shape of the Casing 10 The structure of the joint between the body portion 11 and the lower lid portion 13 will be described. FIG. 3 is a cross-sectional view showing the A-A cross section of the casing 10 in FIG. 2. FIG. 4 is a cross-sectional view showing the B-B cross section of the body portion 11 and the lower lid portion 13 in FIG. 3. FIG. 5 is a cross-sectional view of the body portion 11 in FIG. 4 before being joined. FIG. 6 is a cross-sectional view of the lower lid portion 13 in FIG. 4 before being joined. Hereinafter, as shown in FIGS. 2, 4 to 6, the upper side in the axial direction will be referred to as the "upper side," and the lower side in the axial direction will be referred to as the "lower side." Also, as shown in FIGS. 3 to 6, the side of the outer circumferential surface of the casing 10 in the radial direction will be referred to as the "outer circumferential side," and the side of the inner circumferential surface of the casing 10 in the radial direction will be referred to as the "inner circumferential side."

[0057] The body 11 has a first end face 11 a, which is the lower end face, a first inner circumferential face 11 b, which is the inner circumferential side face, and a first outer circumferential face 11 c, which is the outer circumferential side face. The first inner circumferential face 11 b and the first outer circumferential face 11 c are substantially parallel to the axial direction.

[0058] The body 11 has a cutout 21 formed on the outer periphery of the first end face 11a. The cutout 21 is formed, for example, by cutting the first outer periphery 11c to a certain depth in the radial direction so that a certain dimension remains from the first inner periphery 11b in the radial direction. The cutout 21 forms an annular step at the lower end of the body 11.

[0059] As shown in FIG. 5 , the notch portion 21 has a substantially L-shaped cross section. The notch portion 21 has a notch end surface 21a (second end surface) and a notch outer peripheral surface 21b. The notch end surface 21a is the inner surface of the notch portion 21 and is an end surface that is substantially parallel to the radial direction. The notch outer peripheral surface 21b is the inner surface of the notch portion 21 and is an end surface that is substantially parallel to the axial direction. The angle between the notch end surface 21a and the notch outer peripheral surface 21b is approximately 90°. The notch end surface 21a is a stepped surface that connects the notch outer peripheral surface 21b and the first outer peripheral surface 11c. Hereinafter, the lower end of the body portion 11, which is the portion from the first end surface 11a to the notch end surface 21a in the axial direction, will be referred to as the first end portion 11d. The first end 11d corresponds to the portion where the notch 21 is formed in the axial direction.

[0060] The ratio of the axial dimension t1 of the first end 11d to the radial dimension t2 of the first end 11d is 3:2 to 10:1. In other words, t1 / t2 is 1.5 or greater and 10 or less. As shown in FIG. 5 , the axial dimension t1 of the first end 11d is the axial dimension of the notched outer peripheral surface 21b. As shown in FIG. 5 , the radial dimension t2 of the first end 11d is the radial dimension from the notched outer peripheral surface 21b to the first inner peripheral surface 11b.

[0061] The lower cover portion 13 has a third end face 13a, which is the upper end face, a second inner peripheral face 13b, which is the side face on the inner periphery, and a second outer peripheral face 13c, which is the side face on the outer periphery. The third end face 13a is approximately parallel to the radial direction. As shown in FIG. 6 , the second inner peripheral face 13b includes a vertical surface 13b1 (second side face) and an inclined surface 13b2 (first side face). The vertical surface 13b1 is approximately parallel to the axial direction. The vertical surface 13b1 is located between the third end face 13a and the inclined surface 13b2 in the axial direction. The inclined surface 13b2 is inclined with respect to the axial direction. The cross-sectional shape of the inclined surface 13b2 is arbitrary. For example, the cross-sectional shape of the inclined surface 13b2 may be a straight line, a curved line, or a combination of a straight line and a curved line. Here, the curved line may be, for example, an arc shape.

[0062] Figure 5 shows the radial dimension t3 of the cutout end face 21a. Figure 6 shows the radial dimension t4 of the third end face 13a and the axial dimension t5 of the vertical surface 13b1. The radial dimension t2 of the first end 11d is shorter than the radial dimension t3 of the cutout end face 21a. The radial dimension t3 of the cutout end face 21a is shorter than the radial dimension t4 of the third end face 13a. The axial dimension t1 of the first end 11d is longer than the axial dimension t5 of the vertical surface 13b1.

[0063] When the thickness of the body portion 11 (the sum of dimensions t2 and t3) is 4.5 mm to 10.5 mm and the thickness of the lower lid portion 13 (dimension t4) is 5.0 mm to 6.0 mm, specific examples of dimensions t1 to t5 are as follows: Dimension t1 is 9.0 mm to 11.0 mm. Dimension t2 is 1.0 mm to 7.0 mm. Dimension t3 is 2.5 mm to 3.5 mm. Dimension t4 is 5.0 mm to 6.0 mm. Dimension t5 is 6.0 mm to 8.0 mm.

[0064] When the body 11 and the lower cover 13 are joined together, the notched end surface 21 a of the body 11 comes into contact with the third end surface 13 a of the lower cover 13. As shown in Fig. 4 , the outer peripheral edge of the third end surface 13 a is located closer to the outer periphery than the outer peripheral edge of the notched end surface 21 a. Therefore, a portion of the outer peripheral side of the third end surface 13 a is exposed to the space outside the casing 10.

[0065] The body portion 11 and the lower lid portion 13 are joined by welding at a welded portion 14. The welded portion 14 joins a first outer peripheral surface 11c of the body portion 11 and a third end surface 13a of the lower lid portion 13.

[0066] The vertical surface 13b1 of the lower lid portion 13 faces the cutout outer peripheral surface 21b of the body portion 11. As shown in Fig. 4, a gap is formed between the vertical surface 13b1 and the cutout outer peripheral surface 21b. The radial dimension of the gap between the vertical surface 13b1 and the cutout outer peripheral surface 21b is, for example, 1.0 mm to 2.0 mm.

[0067] The first end 11d of the body 11 contacts the inclined surface 13b2 of the lower lid 13. The axial dimension t1 of the first end 11d is set to be longer than the axial dimension t5 of the vertical surface 13b1, so that the lower end of the first end 11d contacts the inclined surface 13b2. In this case, the corner 11e located below and on the outer periphery of the first end 11d contacts the inclined surface 13b2.

[0068] (4) Assembling Process of Casing 10 The assembling process of the casing 10 includes a step of joining the body portion 11 and the lower cover portion 13. This step includes a first step and a second step.

[0069] In the first step, the body 11 and the lower lid 13 are positioned. First, the lower lid 13 is stably placed on a floor or the like. Specifically, the lower lid 13 is placed so that the third end surface 13a is aligned horizontally and the vertical surface 13b1 is aligned vertically. Next, the body 11 is lowered from above the lower lid 13 so that the axial direction of the body 11 is aligned vertically. Next, the body 11 is positioned so that the cutout end surface 21a of the body 11 rests on the third end surface 13a of the lower lid 13. After positioning, the cutout end surface 21a of the body 11 contacts the third end surface 13a of the lower lid 13. After positioning, the first end 11d of the body 11 contacts the inclined surface 13b2 of the lower lid 13.

[0070] In the second step, the body portion 11 and the lower cover portion 13, which were positioned in the first step, are joined together. As shown in Fig. 4 , the first outer peripheral surface 11c of the body portion 11 and the third end surface 13a of the lower cover portion 13 are welded together to form a welded portion 14. When the body portion 11 and the lower cover portion 13 are welded together, tensile stresses F1 and F2 are generated in the welded portion 14. In Fig. 4 , the tensile stresses F1 and F2 are indicated by dotted arrows. The tensile stress F1 is directed from the first outer peripheral surface 11c of the body portion 11 toward the outer periphery. The tensile stress F2 is directed from the third end surface 13a of the lower cover portion 13 toward the upper side.

[0071] (5) Features (5-1) In the assembly process of the casing 10, the body portion 11 and the lower cover portion 13 are positioned in the axial direction (vertical direction) by abutment surfaces. The abutment surfaces are the cutout end surface 21 a of the body portion 11 and the third end surface 13 a of the lower cover portion 13. Before welding the body portion 11 and the lower cover portion 13 together, the cutout end surface 21 a and the third end surface 13 a are brought into contact with each other to fix the axial positions of the body portion 11 and the lower cover portion 13, thereby positioning the body portion 11 and the lower cover portion 13 in the axial direction.

[0072] Furthermore, before the body portion 11 and the lower cover portion 13 are welded together during the assembly process of the casing 10, the first end portion 11d of the body portion 11 comes into contact with the inclined surface 13b2 of the lower cover portion 13. The body portion 11 is pulled toward the outer periphery by tensile stress generated during welding, and the first end portion 11d of the body portion 11 is pressed toward the inclined surface 13b2. This causes the first end portion 11d to elastically deform, and as shown in FIG. 4 , a portion of the lower side of the first end portion 11d conforms to the inclined surface 13b2. The first end portion 11d deforms to conform to the inclined surface 13b2 around the entire circumference of the lower opening of the body portion 11. The contact between the first end portion 11d and the inclined surface 13b2 before welding does not contribute to the axial positioning of the body portion 11 and the lower cover portion 13.

[0073] Before welding, if the notched end surface 21a and the third end surface 13a do not contact each other and the body portion 11 and the lower cover portion 13 are not positioned axially, the body portion 11 and the lower cover portion 13 contact each other only at the point where the first end portion 11d and the inclined surface 13b2 contact each other. In this case, when the body portion 11 and the lower cover portion 13 are welded together, tensile stress generated during welding may pull the body portion 11 and the lower cover portion 13 in a specific axial direction and a specific radial direction. Therefore, after welding, the body portion 11 may tilt relative to the lower cover portion 13, potentially causing dimensional variations in the assembled casing 10.

[0074] However, in the assembly process of the casing 10 of this embodiment, during welding, the body portion 11 and the lower cover portion 13 are positioned in the axial direction, and the first end portion 11d of the body portion 11 is deformed to follow the inclined surface 13b2 around the entire circumference of the lower opening of the body portion 11. As a result, the body portion 11 and the lower cover portion 13 are centered in the radial direction. Therefore, tilting of the body portion 11 relative to the lower cover portion 13 after welding is suppressed, and dimensional variation of the casing 10 after assembly is suppressed.

[0075] (5-2) The first end 11d of the body portion 11 is deformed by tensile stress from the welded portion 14 during welding. The ratio of the axial dimension t1 of the first end 11d to the radial dimension t2 of the first end 11d is 3:2 to 10:1. Therefore, the dimension t1 corresponding to the length of the first end 11d is sufficiently longer than the dimension t2 corresponding to the thickness of the first end 11d, so the first end 11d is easily deformed by radial tensile stress. Therefore, the body portion 11 and the lower cover portion 13 are easily centered in the radial direction during welding, and dimensional variation of the casing 10 after assembly is suppressed.

[0076] (5-3) Before welding, a gap is formed between the cutout outer peripheral surface 21b of the body portion 11 and the vertical surface 13b1 of the lower cover portion 13. Therefore, when the first end portion 11d of the body portion 11 is pulled outward by tensile stress from the welded portion 14 during welding, the first end portion 11d can move radially through the gap, and the first end portion 11d is easily deformed by the radial tensile stress. Therefore, the body portion 11 and the lower cover portion 13 are easily centered radially during welding, and dimensional variation of the casing 10 after assembly is suppressed.

[0077] (6) Modifications (6-1) Modification A In the embodiment, a cutout portion 21 is formed on the outer periphery of a first end face 11a, which is the lower end face of the body portion 11. The body portion 11 and the lower cover portion 13 are joined by welding with the cutout end face 21a of the cutout portion 21 in contact with the third end face 13a of the lower cover portion 13. However, as will be described next, the body portion 11 and the upper cover portion 12 may also be joined by welding in the same manner as the joint between the body portion 11 and the lower cover portion 13.

[0078] In this modification, as shown in FIG. 7 , a cutout 22 is also formed on the outer periphery of the fourth end face 11f, which is the upper end face of the body 11. In other words, cutouts 21, 22 are formed on both the upper and lower end faces of the body 11. In this case, the body 11 and the upper cover 12 are joined by welding with the cutout end face 22a of the upper cutout 22 of the body 11 in contact with the fifth end face 12a, which is the lower end face of the upper cover 12. Hereinafter, the upper end of the body 11, which is the portion from the fourth end face 11f to the cutout end face 22a in the axial direction, will be referred to as the second end face 11g. The second end face 11g corresponds to the portion where the cutout 22 is formed in the axial direction.

[0079] In this modification, the assembly process of the casing 10 includes a step of joining the body portion 11 and the upper cover portion 12. This step is performed after the first step and the second step, and further includes a third step and a fourth step.

[0080] In the third step, the body 11 and the upper lid 12 are positioned. First, the upper lid 12 is lowered axially from above the body 11. Next, the upper lid 12 is positioned so that the fifth end surface 12a of the upper lid 12 is placed on the upper cutout end surface 22a of the body 11. After positioning, the upper cutout end surface 22a of the body 11 comes into contact with the fifth end surface 12a of the upper lid 12. After positioning, the upper second end 11g of the body 11 comes into contact with the inclined surface 12b2 of the upper lid 12. The inclined surface 12b2 corresponds to the inclined surface 13b2 of the lower lid 13.

[0081] In the fourth step, the body portion 11 positioned in the third step is joined to the upper cover portion 12. As shown in Fig. 7, the first outer peripheral surface 11c of the body portion 11 and the fifth end surface 12a of the upper cover portion 12 are joined by welding to form a welded portion 14. When the body portion 11 and the upper cover portion 12 are welded together, tensile stress is generated in the welded portion 14.

[0082] This modified example can also be applied to modified examples B to D. This modified example can also be applied to a configuration in which the notch 22 is formed only on the upper end surface of the body 11.

[0083] (6-2) Modification B The first end 11d of the body 11 has a corner 11e that contacts the inclined surface 13b2. The corner 11e may be chamfered. For example, as shown in FIG. 8, the corner 11e is chamfered into a rounded shape. When the first end 11d is pulled outward due to tensile stress generated from the welded portion 14 during welding, the rounded chamfered corner 11e can move smoothly along the inclined surface 13b2, and the first end 11d is easily deformed by the radial tensile stress. Therefore, the body 11 and the lower cover 13 are easily centered in the radial direction during welding, and dimensional variation of the casing 10 after assembly is reduced.

[0084] (6-3) Modification C Before welding, the first end 11d of the body 11 does not have to be in contact with the inclined surface 13b2 of the lower lid portion 13. In this case, the body 11 and the lower lid portion 13 are designed so that the first end 11d is pulled outward by tensile stress generated from the welded portion 14 during welding, and the first end 11d comes into contact with the inclined surface 13b2.

[0085] (6-4) Modification D The cutout portion 21 of the body portion 11 has a cutout end surface 21a and a cutout outer peripheral surface 21b. However, the configuration of the cutout portion 21 is not limited to this, as long as the inner surface of the cutout portion 21 is in surface contact with the third end surface 13a of the lower cover portion 13 and the first end portion 11d of the body portion 11 is in contact with the inclined surface 13b2 of the lower cover portion 13. For example, the cutout portion 21 may have a cutout outer peripheral surface 21b that is inclined with respect to the axial direction. Furthermore, for example, the cutout portion 21 may have a stepped surface in addition to the cutout end surface 21a.

[0086] Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure as defined in the claims.

[0087] 10: Casing 11: Body 11a: First end surface 11d: First end 11e: Corner 13: Lower lid (lid) 13a: Third end surface 13b1: Vertical surface (second side surface) 13b2: Inclined surface (first side surface) 14: Welded portion 15: Compression mechanism 16: Motor 21: Cutout 21a: Cutout end surface (second end surface) 100: Refrigeration device 101: Scroll compressor (compressor) 110: Refrigerant circuit

[0088] International Publication No. 2018 / 138772

Claims

1. A compressor comprising: a compression mechanism (15) that compresses a refrigerant; a motor (16) that drives the compression mechanism; and a casing (10) that houses the compression mechanism and the motor, wherein the casing has a cylindrical body portion (11), a dome-shaped lid portion (13), and a welded portion (14) that joins the body portion and the lid portion, wherein the body portion has: a first end face (11a) in the axial direction of the cylindrical shape; a notched portion (21) formed on the outer periphery of the first end face; a second end face (21a) that is an inner surface of the notched portion and extends along the radial direction of the cylindrical shape; and a first end portion (11d) from the first end face to the second end face in the axial direction, wherein the lid portion has: a first side surface (13b2) that is an inner periphery surface inclined with respect to the axial direction; and a third end face (13a) that extends along the radial direction, the first end contacts the first side surface; the second end contacts the third end surface; an outer peripheral edge of the third end surface is located more outer than an outer peripheral edge of the second end surface; and the welded portion joins the outer peripheral surface of the body portion and the third end surface.

2. The compressor according to claim 1, wherein the ratio of the axial dimension of said first end to the radial dimension of said first end is between 3:2 and 10:

1.

3. The compressor according to claim 1 or 2, wherein the body portion has the notch formed on both sides in the axial direction.

4. A compressor according to any one of claims 1 to 3, wherein the first end portion has a portion that extends along the first side surface.

5. A compressor according to any one of claims 1 to 4, wherein the first end has a corner (11e) that contacts the first side surface, and the corner is chamfered.

6. A compressor according to any one of claims 1 to 5, wherein the cover portion has a second side surface (13b1) that is an inner peripheral surface located between the third end surface and the first side surface in the axial direction and faces the inner surface of the cutout portion.

7. A refrigeration system (100) comprising: a compressor (101) according to any one of claims 1 to 6; and a refrigerant circuit (110) through which refrigerant compressed by the compressor flows.

8. A method for assembling a compressor as set forth in any one of claims 1 to 6, comprising: a step of positioning the body portion and the lid portion so that the second end face of the body portion and the third end face of the lid portion are in contact and so that the first end portion of the body portion and the first side face of the lid portion are in contact; and a step of joining the outer peripheral surface of the body portion and the third end face of the lid portion by welding to form the welded portion.

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