Rotary machine unit, compressor and refrigeration device

Abstract

A rotating machine unit includes a housing (20) having a cylindrical trunk portion (20a), a stator core (61) fixed to an inner peripheral surface of the trunk portion (20a), and a first member (12) provided between the inner peripheral surface of the trunk portion (20a) and an outer peripheral surface of the stator core (61). The inner peripheral surface of the trunk portion (20a) is shaped as a non-true circle as viewed in a cylinder axis direction of the trunk portion, and the first member (12) is made of a material having a Young's modulus lower than those of a material constituting the trunk portion (20a) and a material constituting the stator core (61).

Description

Technical Field

[0001] This disclosure relates to a rotating machinery unit, a compressor, and a refrigeration device. Background Technology

[0002] Patent document 1 discloses a compressor in which the stator of an electric motor is arranged in the body of the housing in a clearance fit or transition fit.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Publication No. 2003-176781 Summary of the Invention

[0006] -The technical problem the invention aims to solve-

[0007] In this type of compressor, the inner circumferential surface of the casing body is mostly non-circular when viewed from the cylinder shaft direction. Therefore, a gap is generated between the outer circumferential surface of the stator core, which is fixed by an interference fit, and the inner circumferential surface of the casing body, which may reduce the holding force that keeps the stator core within the casing body.

[0008] The purpose of this disclosure is to increase the holding force that keeps the stator core within a housing having a non-circular body.

[0009] - Technical solutions used to solve technical problems -

[0010] The first aspect of this disclosure is a rotating mechanical unit.

[0011] The rotating mechanical unit includes a housing 20, a stator core 61, and a first component 12.

[0012] The shell 20 has a cylindrical body 20a.

[0013] The stator core 61 is fixed to the inner circumferential surface of the body 20a.

[0014] The first component 12 is disposed between the inner peripheral surface of the body 20a and the outer peripheral surface of the stator core 61.

[0015] Viewed from the cylindrical axis direction of the torso 20a, the inner circumferential surface of the torso 20a is not perfectly circular.

[0016] The first component 12 is made of a material with a lower Young's modulus than the material constituting the body 20a and the material constituting the stator core 61.

[0017] In the first aspect, since the Young's modulus of the first component 12 is lower than that of the housing 20 and the stator core 61, the first component 12 is more easily deformed between the inner circumferential surface of the body 20a and the outer circumferential surface of the stator core 61. Therefore, by placing the first component 12 in the gap between the inner circumferential surface of the body 20a and the outer circumferential surface of the stator core 61, the contact area between the outer circumferential surface of the stator core 61 and the inner circumferential surface of the body 20a can be increased via the first component 12. As a result, the holding force that keeps the stator core 61 within the body 20a can be increased via the first component.

[0018] The second aspect of this disclosure is, based on the first aspect,

[0019] The torso 20a has a recess 25 formed on the inner circumferential surface of the torso 20a.

[0020] The first component 12 is disposed between the recess 25 and the outer peripheral surface of the stator core 61.

[0021] In the second aspect, by providing the first component 12 in the recess 25, the outer peripheral surface of the stator core 61 and the inner peripheral surface of the body 20a can be fixed at the location where the recess 25 is formed via the first component 12.

[0022] The third aspect of this disclosure is, based on the second aspect,

[0023] The torso 20a has a torso body 23 and a welded portion 24 that connects the two ends of the torso body 23 in the circumferential direction.

[0024] The recess 25 is a groove 25 formed on the welded portion 24.

[0025] In the third aspect, the first component 12 can be disposed in the groove 25, which is a recess 25.

[0026] The fourth aspect of this disclosure is, based on the third aspect,

[0027] The groove 25 is a cutting groove 25 formed on the inner circumferential surface of the body 20a.

[0028] In the fourth aspect, the first component 12 can be disposed in the cutting groove 25, which is a groove 25.

[0029] The fifth aspect of this disclosure is, based on any one of the first to fourth aspects,

[0030] The torso 20a has a protrusion 27 formed on the inner circumferential surface of the torso 20a.

[0031] The first component 12 is disposed between the protrusion 27 and the outer peripheral surface of the stator core 61.

[0032] In the fifth aspect, the first component 12 can be disposed in the gap between the inner peripheral surface of the body 20a and the outer peripheral surface of the stator core 61 at the location where the protrusion 27 is formed. Thus, even at the location where the protrusion 27 is formed, the outer peripheral surface of the stator core 61 and the inner peripheral surface of the body 20a can be fixed by the first component 12.

[0033] The sixth aspect of this disclosure is, based on the fifth aspect,

[0034] The torso 20a has a torso body 23 and a welded portion 24 that connects the two ends of the torso body 23 in the circumferential direction.

[0035] The protrusion 27 is a weld bead 27 formed on the weld portion 24.

[0036] In the sixth aspect, at the location where the weld bead 27 is formed, the inner peripheral surface of the body 20a and the outer peripheral surface of the stator core 61 can be fixed via the first component 12.

[0037] The seventh aspect of this disclosure is based on any one of the first to sixth aspects.

[0038] The torso 20a includes an enlarged diameter portion 26 formed by increasing the inner diameter of the inner circumferential surface of the torso 20a.

[0039] In the seventh aspect, the stator core 61 can be fixed within the body 20a having the enlarged diameter portion 26.

[0040] The eighth aspect of this disclosure is based on any one of the first to seventh aspects.

[0041] The material constituting the first component 12 includes a resin material.

[0042] In the eighth aspect, a resin material can be used as the first component 12.

[0043] The ninth aspect of this disclosure is, based on the eighth aspect,

[0044] The material constituting the first component 12 includes a thermoplastic resin material.

[0045] The stator core 61 is fixed to the inner circumferential surface of the body 20a via the first component 12 through a thermo-pressing fit.

[0046] In the ninth aspect, the first component 12, which contains thermoplastic resin material, can be deformed by the heating process of the housing 20 in the hot pressing process. The thermoplastic resin material is then cured by the cooling process of the housing 20, thereby enabling the first component 12 to be tightly joined to the inner peripheral surface of the body 20a and the outer peripheral surface of the stator core 61.

[0047] The tenth aspect of this disclosure is based on any one of the first to ninth aspects.

[0048] The Young's modulus of the material constituting the first component 12 is less than half of the Young's modulus of the material constituting the body 20a and the material constituting the stator core 61.

[0049] In the tenth aspect, the first component 12 can be disposed relatively easily between the inner circumferential surface of the body 20a and the outer circumferential surface of the stator core 61.

[0050] The eleventh aspect of this disclosure is based on any one of the first to ninth aspects.

[0051] The Young's modulus of the material constituting the first component 12 is less than 1 / 10 of the Young's modulus of the material constituting the body 20a and the material constituting the stator core 61.

[0052] In the eleventh aspect, the first component 12 can be disposed relatively easily between the inner circumferential surface of the body 20a and the outer circumferential surface of the stator core 61.

[0053] The twelfth aspect of this disclosure is based on any one of the first to eleventh aspects.

[0054] The materials constituting the body 20a and the stator core 61 include iron materials.

[0055] Furthermore, the material constituting the first component 12 includes aluminum.

[0056] In the twelfth aspect, aluminum, a metal with a lower Young's modulus than iron, can be used as the first component 12.

[0057] The thirteenth aspect is based on any one of the first to eleventh aspects.

[0058] The materials constituting the body 20a and the stator core 61 are metals.

[0059] Furthermore, the material constituting the first component 12 includes resin material.

[0060] In the thirteenth aspect, since the Young's modulus of the resin is lower than that of the metal, it is relatively easy to place the first component 12 between the inner peripheral surface of the body 20a and the outer peripheral surface of the stator core 61.

[0061] The fourteenth aspect of this disclosure is based on any one of the first to thirteenth aspects.

[0062] The deviation of the inner circumferential surface of the torso 20a from a perfect circle is more than 0.3%.

[0063] In the fourteenth aspect, even if the deviation from the perfect circle is more than 0.3%, the holding force that keeps the stator core 61 within the body 20a can be increased by setting the first component 12.

[0064] The fifteenth aspect of this disclosure is based on any one of the first to thirteenth aspects.

[0065] The deviation of the inner circumferential surface of the torso 20a from a perfect circle is more than 0.6%.

[0066] In the fifteenth aspect, even if the deviation from the perfect circle is more than 0.6%, the holding force that keeps the stator core 61 within the body 20a can be increased by setting the first component 12.

[0067] The sixteenth aspect of this disclosure is based on any one of the first to thirteenth aspects.

[0068] The deviation of the inner circumferential surface of the torso 20a from a perfect circle is more than 1.0%.

[0069] In the sixteenth aspect, even if the deviation from the perfect circle is more than 1.0%, the holding force that keeps the stator core 61 within the body 20a can be increased by setting the first component 12.

[0070] The seventeenth aspect of this disclosure is a compressor that includes a rotating mechanical unit according to any one of the first to sixteenth aspects.

[0071] The eighteenth aspect of this disclosure is a refrigeration apparatus that includes the compressor of the seventeenth aspect. Attached Figure Description

[0072] Figure 1 This is a simplified diagram showing the structure of the refrigerant circuit included in the refrigeration device of the embodiment;

[0073] Figure 2 It is a longitudinal sectional view of a compressor having an embodiment of a rotating mechanical unit;

[0074] Figure 3It is a sectional view of the torso orthogonal to the direction of the cylinder axis of the torso, used to illustrate the deviation relative to the perfect circle;

[0075] Figure 4 It is a cross-sectional view of a compressor with a rotating mechanical unit;

[0076] Figure 5A It is a three-dimensional diagram used to illustrate the formation of the main body of the torso;

[0077] Figure 5B This is an enlarged view of a portion of the main body of the torso, seen from the direction of the cylinder axis, used to illustrate the formation of the welded parts;

[0078] Figure 5C This is a diagram of the main body of the trunk as seen from the direction of the cylinder axis, used to illustrate the formation of the expanded diameter section;

[0079] Figure 5D This is an enlarged image of a portion of the torso, used to illustrate the formation of the cutting groove;

[0080] Figure 6 This is a flowchart illustrating a method for fixing the stator to the torso;

[0081] Figure 7 It is a longitudinal sectional view of a compressor including the rotating machinery unit of Modified Example 1;

[0082] Figure 8 It is a longitudinal sectional view of a compressor including other embodiments of a rotating mechanical unit;

[0083] Figure 9A This is an enlarged view of a portion of the torso as seen from the axis of the cylinder, used for illustration. Figure 8 The formation of the body of the rotating mechanical unit;

[0084] Figure 9B This is an enlarged view of a portion of the torso as seen from the axis of the cylinder, used for illustration. Figure 8 The formation of the body of the rotating mechanical unit;

[0085] Figure 10 This is a simplified diagram showing a longitudinal section of a compressor having a rotating mechanical unit as described in other embodiments. Detailed Implementation

[0086] The following description, with reference to the accompanying drawings, outlines this embodiment. It should be noted that the following embodiments are essentially preferred examples and are not intended to limit the scope of the invention, its applications, or its uses. Figure 4 , Figure 7 as well as Figure 8 In the text, part of the slash is omitted.

[0087] (Implementation Method)

[0088] <Air conditioning unit>

[0089] like Figure 1 and Figure 2 As shown, the rotary mechanical unit 10 of the embodiment constitutes a compressor 6 for compressing fluid. The compressor 6 is installed in, for example... Figure 1 The air conditioning unit 1 shown is the refrigeration unit 1 of this disclosure.

[0090] The air conditioning unit 1 includes an outdoor unit 31 and an indoor unit 32. The outdoor unit 31 and the indoor unit 32 are connected together via a liquid connection pipe 33 and a gas connection pipe 34. These components together form a refrigerant circuit 11, which is filled with refrigerant. The refrigerant circuit 11 mainly includes a compressor 6, an outdoor heat exchanger 7, an expansion valve 8, an indoor heat exchanger 9, and a four-way reversing valve 35. The air conditioning unit 1 performs a cooling cycle by circulating the refrigerant between the outdoor unit 31 and the indoor unit 32, thereby conditioning the air in the indoor space. The air conditioning unit 1 operates in either cooling or heating mode.

[0091] <Outdoor unit>

[0092] The outdoor unit 31 is located outdoors. The outdoor unit 31 includes a compressor 6, an outdoor heat exchanger 7, an expansion valve 8, a four-way reversing valve 35, and an outdoor fan 36.

[0093] Compressor 6 draws in low-pressure gaseous refrigerant and compresses it. Compressor 6 then ejects the compressed refrigerant. Details about compressor 6 will be described later.

[0094] The outdoor heat exchanger 7 allows outdoor air supplied by the outdoor fan 36 to exchange heat with the refrigerant. The outdoor fan 36 supplies outdoor air through the outdoor heat exchanger 7.

[0095] Expansion valve 8 reduces the pressure of the refrigerant. Expansion valve 8 is an electrically operated expansion valve with adjustable opening. Expansion valve 8 can be connected to the liquid connection pipe 33 of the refrigerant circuit 11, or it can be installed in the indoor unit 32.

[0096] The four-way reversing valve 35 has a first valve port P1, a second valve port P2, a third valve port P3, and a fourth valve port P4. The first valve port P1 is connected to the discharge section of the compressor 6. The second valve port P2 is connected to the suction section of the compressor 6. The third valve port P3 is connected to the gas side end of the outdoor heat exchanger 7. The fourth valve port P4 is connected to the gas connection pipe 34.

[0097] The four-way directional valve 35 is in the first state ( Figure 1 The state shown in solid lines in the middle) and the second state ( Figure 1The system switches between states (shown by dashed lines). In the first state, the first valve port P1 is connected to the third valve port P3, and the second valve port P2 is connected to the fourth valve port P4. In the second state, the first valve port P1 is connected to the fourth valve port P4, and the second valve port P2 is connected to the third valve port P3. By switching between the first and second states using the four-way reversing valve 35, the air conditioning unit 1 can switch between cooling and heating operations.

[0098] <Indoor unit>

[0099] The indoor unit 32 is installed indoors. The indoor unit 32 has an indoor fan 37 and an indoor heat exchanger 9.

[0100] The indoor heat exchanger 9 is the utilization-side heat exchanger of this disclosure. An indoor fan 37 delivers indoor air through the indoor heat exchanger 9. The indoor heat exchanger 9 enables heat exchange between the indoor air delivered by the indoor fan 37 and the refrigerant.

[0101] - Compressor Structure -

[0102] The compressor 6 has a rotating mechanical unit 10. The rotating mechanical unit 10 includes a housing 20, a stator core 61, and a resin layer 12, details of which will be described later. Furthermore, the compressor 6 includes a compression mechanism 40, a motor 30, and a shaft 50. The shaft 50 connects the motor 30 and the compression mechanism 40. The motor 30 includes a stator 60. The stator 60 includes a stator core 61.

[0103] [Compression mechanism]

[0104] The compression mechanism 40 compresses the fluid. In this example, the compression mechanism 40 compresses the refrigerant drawn in through the suction pipe 21 provided on the housing 20 and sprays the compressed refrigerant into the interior space of the housing 20. The refrigerant sprayed into the interior space of the housing 20 is then sprayed out through the discharge pipe 22 provided on the housing 20.

[0105] [Electric motor]

[0106] The electric motor 30 drives the shaft 50 to rotate. The compression mechanism 40 is driven to work by the rotation of the shaft 50.

[0107] [Structure of an electric motor]

[0108] like Figure 2 and Figure 4 As shown, the motor 30 includes a stator 60 and a rotor 70.

[0109] In the following description, "axial" refers to the direction of the axis of stator 60 (the center of rotation of rotor 70). "Radial" refers to the direction orthogonal to the axis of stator 60. "Circumferential" refers to the direction around the axis of stator 60. "Longitudinal section" refers to a section along the axial direction, and "transverse section" refers to a section orthogonal to the axial direction.

[0110] The stator 60 is fixed to the inner circumferential surface of the housing 20. The rotor 70 is arranged radially inside the stator 60 with a gap G. In this example, the motor 30 is a synchronous motor with embedded magnets.

[0111] (stator)

[0112] The stator 60 has a stator core 61 and a coil 65.

[0113] The stator core 61 has a back yoke 62 and teeth 63, which will be described in detail later.

[0114] The coil 65 is wound on the tooth 63. In this example, the coil 65 is wound on the tooth 63 in a concentrated winding manner.

[0115] (rotor)

[0116] The rotor 70 has a rotor core 71 and permanent magnets 75. In this example, four permanent magnets 75 are provided.

[0117] The rotor core 71 has slots 72 and shaft holes 73. In this example, four slots 72 are provided, corresponding to four permanent magnets. The rotor core 71 is a laminated core. Specifically, the rotor core 71 is constructed by axially stacking multiple electromagnetic steel plates, each made of electromagnetic steel and formed in an approximately circular shape.

[0118] The slot 72 houses the permanent magnet 75. In this example, the four slots 72 are arranged at equal intervals (specifically at 90° intervals) along the circumference.

[0119] The shaft hole 73 extends axially through the center of the rotor core 71. A shaft 50 is inserted into and fixed in the shaft hole 73.

[0120] Permanent magnets 75 constitute the magnetic poles of rotor 70. In this example, four magnetic poles are formed by housing four permanent magnets 75 in four slots 72. The permanent magnets 75 are sintered magnets.

[0121] <Structure of a Rotating Mechanical Unit>

[0122] The housing 20, stator core 61, and resin layer 12 constituting the rotating machinery unit 10 will be described.

[0123] 〔case〕

[0124] The housing 20 houses the components of the rotating mechanical unit 10. The housing 20 has a cylindrical body 20a extending vertically and two caps 20b closing both ends of the body. The material constituting the housing 20 is metal. Specifically, the material constituting the housing 20 includes iron.

[0125] The body 20a has a main body 23, an enlarged diameter portion 26, and a groove 25. The main body 23 is cylindrical. The enlarged diameter portion 26 is formed by enlarging the inner diameter of the inner circumferential surface of the body 20a. In fact, the enlarged diameter portion 26 is the entire inner circumferential surface of the body 20a. The groove 25 is a recess 25 of this disclosure. Specifically, the groove 25 is a cutting groove 25. The cutting groove 25 is formed on the inner circumferential surface of the body 20a, as detailed later. The cutting groove 25 extends along the vertical direction of the body 20a.

[0126] In a cross-section of the torso 20a orthogonal to the cylindrical axis direction, the shape of the inner circumferential surface of the torso 20a, viewed from the cylindrical axis direction, is not perfectly circular. In this example, in the cylindrical axis direction of the torso 20a, the shape of any cross-section of the torso 20a orthogonal to the cylindrical axis direction is formed to be approximately the same. Specifically, the deviation of the inner circumferential surface of the torso 20a from a perfect circle is 0.6% or more. This "deviation from a perfect circle" G is calculated by G(%) = roundness of the inner circumferential surface of the torso 20a dmin (μm) / outer diameter of the torso 20a rmin (μm) / 2 × 100.

[0127] like Figure 3 As shown, when a section of the torso 20, orthogonal to the cylindrical axis of the torso 20a, is sandwiched between two circles C1 and C2 centered at the cylindrical axis O, the roundness of the inner circumference of the torso 20 is represented by the difference d between the radius d1 of circle C1 and the radius d2 of circle C2, where the interval between the two concentric circles is smallest. dmin is the minimum radius difference d in any section of the torso orthogonal to the cylindrical axis of the torso. rmin is the outer diameter of the torso 20a in the section with a radius difference d of dmin.

[0128] like Figure 2 As shown, housing 20 houses motor 30, compression mechanism 40, and shaft 50. Shaft 50 extends vertically. Motor 30 is positioned above compression mechanism 40.

[0129] An intake pipe 21 and an exhaust pipe 22 are provided on the housing 20. The intake pipe 21 passes through the body of the housing 20 and is connected to the compression mechanism 40. The exhaust pipe 22 passes through the upper part of the housing 20 and communicates with the internal space of the housing 20.

[0130] [Stator core]

[0131] The stator core 61 has a back yoke 62 and teeth 63. In this example, six teeth 63 are provided. The stator core 61 is a laminated core. Specifically, the stator core 61 is constructed by axially stacking multiple electromagnetic steel plates, each made of electromagnetic steel and formed in an approximately annular shape. The material constituting the stator core 61 is metal. Specifically, the material constituting the stator core 61 includes iron.

[0132] The back yoke 62 is formed into an approximately cylindrical shape.

[0133] The tooth 63 extends radially inward from the inner circumferential surface of the back yoke 62. In this example, the six teeth 63 are arranged circumferentially at equal intervals (specifically at 60° intervals).

[0134] [Resin layer]

[0135] The resin layer 12 is the first component 12 of this disclosure. The Young's modulus of the resin layer 12 is lower than that of the materials constituting the housing 20 and the stator core 61. The Young's modulus of the resin layer 12 is less than 1 / 10 of the Young's modulus of the materials constituting the housing 20 and the stator core 61. Specifically, the resin layer 12 is formed of a resin material. The resin material includes thermoplastic resins. Thermoplastic resins include, for example, polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), polyamide (PA) nylon, and liquid crystal polymers (LCP).

[0136] The resin layer 12 is disposed between the inner peripheral surface of the body 20a and the outer peripheral surface of the stator core 61. Specifically, the resin layer 12 is disposed between the cutting groove 25 of the body 20a and the outer peripheral surface of the stator core 61.

[0137] In this way, the rotating mechanical unit 10 in this example is disposed in a partial gap between the inner peripheral surface of the body 20a and the outer peripheral surface of the stator core 61 via the resin layer 12. The rotating mechanical unit 10 in this example has a portion in which the inner peripheral surface of the body 20a is fixed to the stator core 61 via the resin layer 12, and a portion in which the inner peripheral surface of the body 20a is in direct contact with and fixed to the stator core 61.

[0138] [Manufacturing of rotating machine units]

[0139] Next, the manufacturing method of the rotating mechanical unit 10 will be described. After forming the body 20a, the stator is fixed inside the body 20a by hot pressing, thereby manufacturing the rotating mechanical unit 10.

[0140] like Figures 5A to 5D As shown, the body 20a is formed by sequentially forming a body main body 23, a welding part 24, an enlarged diameter part 26, and a cutting groove 25.

[0141] like Figure 5AAs shown, the torso body 23 is formed by cutting the iron plate into quadrilaterals and then rolling it into a cylindrical shape.

[0142] like Figure 5B As shown, a welded portion 24 is formed by welding the two ends of the torso body 23 after roll forming together. In the welded portion 24, if the molten metal on the inner and outer surfaces of the torso body cools and solidifies, a weld bead 27 is formed in a raised shape at the joint (welded portion 24).

[0143] like Figure 5C As shown, the entire inner circumferential surface of the torso 20a is uniformly expanded radially outward to form the expanded diameter portion 26 by increasing the inner diameter of the torso 20a.

[0144] like Figure 5D As shown, a cutting groove 25 is formed by cutting the weld 27 formed on the inner circumferential surface of the body 20a in the weld 27.

[0145] Next, the method of fixing the stator core 61 within the body 20a by hot pressing will be explained.

[0146] like Figure 6 As shown, a heating process (step ST1) is performed to heat the body 20a. The body 20a expands due to heating, and its inner diameter increases. Next, the stator core 61 and resin material are inserted into the body 20a (step ST2). At this time, the resin material is arranged such that a resin layer 12 is provided between the cutting groove 25 formed on the inner circumferential surface of the body 20a and the outer circumferential surface of the stator core 61.

[0147] Next, a cooling process (step ST3) is performed on the body 20a. During the cooling process, the body 20a shrinks, and its inner diameter decreases. The resin material comes into contact with the shrunken body 20a and melts and deforms due to the residual heat of the body 20a. If further cooled, the resin material cools and solidifies, filling the cutting groove 25, and deforms due to compressive stress from the stator core 61 and the body 20a, causing the outer circumferential surface of the stator core 61 to tightly bond with the inner circumferential surface of the body 20a. In this way, a resin layer 12 is formed between the cutting groove 25 and the outer circumferential surface of the stator core 61.

[0148] [Effects of the Implementation Method]

[0149] In the rotating machinery unit 10 of the embodiment, a resin layer 12 (first component) is provided between the inner peripheral surface of the body 20a of the housing 20, which is non-circular when viewed from the cylindrical axis, and the outer peripheral surface of the stator core 61. The Young's modulus of the resin layer 12 is lower than that of the materials constituting the housing 20 and the stator core 61. Therefore, the resin layer 12 is more easily deformed between the inner peripheral surface of the body 20a and the outer peripheral surface of the stator core 61. Therefore, by providing the resin layer 12 in the gap between the inner peripheral surface of the body 20a and the outer peripheral surface of the stator core 61, the contact area between the outer peripheral surface of the stator core 61 and the inner peripheral surface of the body 20a can be increased via the resin layer 12. As a result, even if the inner circumferential surface of the body 20a of the housing 20 is not perfectly circular when viewed from the cylindrical axis direction, the holding force that keeps the stator core 61 within the body 20a can be increased, thereby reducing the stress on the stator core 61 and improving the efficiency of the motor.

[0150] Furthermore, the resin layer 12 disposed between the stator core 61 and the body 20a increases the holding force of the stator core 61 relative to the circumference. Thus, even when the rotor 70 rotates, circumferential displacement of the stator core 61 within the body 20a can be suppressed.

[0151] In the rotating mechanical unit 10 of the embodiment, the body 20a has a recess 25 formed on the inner peripheral surface of the body 20a, and a resin layer 12 is disposed between the recess 25 and the outer peripheral surface of the stator core 61. The resin layer 12 is disposed in a manner that blocks the recess 25, thereby allowing the outer peripheral surface of the stator core 61 and the inner peripheral surface of the body 20a to be fixed at the location where the recess 25 is formed via the resin layer 12. Furthermore, by forming the resin layer 12 in an embedded manner within the recess 25, it is possible to suppress the displacement of the resin layer 12 within the body 20a caused by the rotation of the motor 30.

[0152] In the rotating mechanical unit 10 of the embodiment, the torso 20a has a torso body 23 and a welded portion 24 that connects the two ends of the torso body 23 in the circumferential direction, and the recess 25 is a groove 25 formed on the welded portion 24. As a result, the resin layer 12 can be disposed in the groove 25 formed in the welded portion 24.

[0153] In the rotating machine unit 10 of the embodiment, the groove 25 is a cutting groove 25 formed on the inner circumferential surface of the body 20a. Generally, when the stator core 61 and the body 20a are fixed by interference fit, the outer circumferential surface of the stator core 61 is kept away from the weld portion 24 as much as possible. This is because the manufacturing tolerance of the weld portion 24 tends to be larger than that of the body 20a other than the weld portion 24. Therefore, if the stator core 61 and the body 20a are fixed by interference fit with the outer circumferential surface of the stator core 61 in contact with the weld portion 24 of the body 20a, the magnitude of the stress generated by the interference fit will vary in each individual (each rotating machine unit), and the stress will concentrate in specific parts of the stator core 61 and the body 20a. As a result, the individual differences in the quality of the rotating machine unit become larger, and damage such as cracking of the body 24a and the stator core 61, and detachment of the stator core 61 may occur.

[0154] On the other hand, in the rotating machinery unit 10 of this example, the outer peripheral surface of the stator core 61 and the inner peripheral surface of the body 20a can be fixed via the resin layer 12. By providing the resin layer 12 in the cutting groove 25, the outer peripheral surface of the stator core 61 and the inner peripheral surface of the body 20a can be fixed via the resin layer 12 at the location where the cutting groove 25 is formed. This is because, by forming the resin layer 12, even if the manufacturing tolerance increases, the deviation of stress applied to the stator core 61 and the body 20a can be suppressed. Furthermore, the resin layer 12 can eliminate individual differences in stress caused by interference fit.

[0155] In the rotating mechanical unit 10 of the embodiment, the body 20a includes an enlarged diameter portion 26 formed by increasing the inner diameter of the inner circumferential surface of the body 20a. Even with such an enlarged diameter portion 26, the holding force that retains the stator core 61 within the body 20a can be increased by providing the resin layer 12 between the outer circumferential surface of the stator core 61 and the inner circumferential surface of the body 20a.

[0156] In the rotating machinery unit 10 of the embodiment, the resin layer 12 comprises a resin material. Since the Young's modulus of the resin material is lower than that of the housing 20 and the stator core 61, the resin layer 12 can be formed relatively easily.

[0157] In the rotating machinery unit 10 of this embodiment, the resin layer 12 comprises a thermoplastic resin material, and the stator core 61 is fixed to the inner circumferential surface of the body 20a via the resin layer 12 through a thermo-pressing process. During the heating process of the body 20a in the thermo-pressing process, the thermoplastic resin material melts and deforms. Following the cooling process of the body 20a, the thermoplastic resin solidifies and tightly bonds to the inner circumferential surface of the body 20a and the outer circumferential surface of the housing 20. By forming such a resin layer 12, the holding force that retains the stator core 61 within the body 20a can be increased.

[0158] In the rotating machinery unit 10 of the embodiment, the Young's modulus of the material constituting the resin layer 12 is less than 1 / 10 of the Young's modulus of the materials constituting the housing 20 and the stator core 61. Such a material is more easily deformed between the inner peripheral surface of the body 20a and the outer peripheral surface of the stator core 61, and the resin layer 12 is more easily formed.

[0159] (Variation Example 1)

[0160] In this example of the rotating machinery unit 10, the position of the resin layer 12 between the stator core 61 and the body 20a differs from that in the embodiment described above. Hereinafter, refer to... Figure 7 The rotating machinery unit 10 in this example will be described.

[0161] In this example, the body 20a has a weld bead 27 formed on the inner circumferential surface of the body 20a. The weld bead 27 is a protrusion 27 of this disclosure. The weld bead 27 is a weld mark formed on the surface of the body 23 and the weld portion 24 that connects the two ends of the body 23 in the circumferential direction.

[0162] In the forming process of the body 20a in this example, the weld bead 27 formed on the inner circumferential surface of the body 20a is not cut. In other words, the body 20a in this example does not have a cutting groove 25.

[0163] By providing the resin layer 12 between the weld bead 27 on the inner circumferential surface of the body 20a and the outer circumferential surface of the stator core 61, the contact area between the outer circumferential surface of the stator core 61 and the inner circumferential surface of the body 20a can be increased via the resin layer 12. Therefore, in this example, even if the inner circumferential surface of the body 20a is not perfectly circular when viewed from the cylinder axis, the holding force that keeps the stator core 61 within the body 20a can be increased.

[0164] Furthermore, as described above, when fixing the stator core 61 and the body 20a by fitting, the weld 27, which serves as the joint, is generally not in contact with the outer peripheral surface of the stator core 61. However, by providing a resin layer 12 between the weld 27 and the outer peripheral surface of the stator core 61, the outer peripheral surface of the stator core 61 and the inner peripheral surface of the body 20a can be fixed via the resin layer 12 at the location where the weld 27 is formed on the inner peripheral surface of the body 20a. This is because the resin layer 12 can suppress the stress applied to the cutting groove 25.

[0165] Furthermore, even when the motor 30 rotates, the resin layer 12 will remain stuck on the weld bead 27, which can suppress the resin layer 12 from shifting within the body 20a.

[0166] (Other implementation methods)

[0167] The above-described embodiments and variations can also adopt the following structure.

[0168] In the embodiment, the materials constituting the housing 20 and the stator core 61 in the rotating machinery unit 10 may include aluminum.

[0169] The Young's modulus of the first component 12 can be less than half of the Young's modulus of the materials constituting the housing 20 and the stator core 61. For example, the materials constituting the housing 20 and the stator core 61 can include iron, and the materials constituting the first component 12 can include aluminum.

[0170] The rotating mechanical unit 10 may also have a housing 20, the inner circumferential surface of the body 20a of which deviates from a perfect circle by more than 0.3%.

[0171] The rotating mechanical unit 10 may also have a housing 20, the inner circumferential surface of the body 20a of which deviates from a perfect circle by more than 1.0%.

[0172] The resin layer 12 may also be disposed between the inner peripheral surface of the body 20a, other than the recess 25 or the protrusion 27 formed on the inner peripheral surface of the body 20a, and the outer peripheral surface of the stator core 61.

[0173] The resin layer 12 can also be disposed on the entire circumference of the inner circumference of the body 20a and the outer circumference of the stator core 61.

[0174] The resin layer 12 can be set from the upper end to the lower end of the stator core 61, or it can be set within a certain range from the upper end to the lower end of the stator core 61.

[0175] like Figure 8As shown, the body section 20a may also have a groove 25 formed on the inner circumferential surface of the body section 20a along the cylindrical axis and a weld bead 27 formed in the groove 25. As a method for forming such a body section 20a, for example, as... Figure 9A As shown, firstly, after forming the two ends of the torso body 23 that protrude radially outward in the circumferential direction, the two ends of the torso body 23 are welded to form a groove 25. At this time, a weld bead 27 is formed on the groove 25 through welding. Alternatively, as... Figure 9B As shown, after making cuts at both ends of the torso body 23 in the circumferential direction, a groove 25 is formed on the inner circumferential surface of the torso body 20a during welding. At this time, a weld bead 27 is formed on the groove 25 by welding.

[0176] The shape of any cross-section of the torso 20a, which is orthogonal to the cylindrical axis direction of the torso 20a, can also be formed into different shapes. Specifically, the protrusion 27 or the recess 25 can also be formed on a portion of the torso 20a from the upper end to the lower end in the cylindrical axis direction.

[0177] In addition, such as Figure 10 As shown, protrusions 27 or recesses 25 may also be formed in the circumferential direction of the body 20a. In this case, the resin layer 12 is also provided between the protrusions 27 on the inner circumferential surface of the body 20a and the outer circumferential surface of the stator core 61, or between the recesses 25 on the inner circumferential surface of the body 20a and the outer circumferential surface of the stator core 61. The resin layer 12 provided between the outer circumferential surface of the stator core 61 and the inner circumferential surface of the body 20a may be provided on the entire circumference of the outer circumferential surface of the stator core 61, or on a portion thereof. A portion of the resin layer 12 may also be provided to protrude from the upper or lower end of the stator core 61.

[0178] Alternatively, a recess 25 or a protrusion 27 may be formed on the outer peripheral surface of the stator core 61. In this case, a resin layer 12 is provided between the recess 25 on the outer peripheral surface of the stator core 61 and the inner peripheral surface of the body 20a, or between the protrusion 27 on the outer peripheral surface of the stator core 61 and the inner peripheral surface of the body 20a.

[0179] The resin layer 12 may contain various resin materials with different properties. The resin layer 12 may also contain glass fiber, fillers, etc.

[0180] Alternatively, the resin layer 12 can be formed by hot pressing the stator core 61 and body 20a together after the resin material is placed in the cutting groove 25.

[0181] The stator core 61 can also be fixed in the body 20a by pressing or cold pressing.

[0182] The first component 12 can be ceramic. Ceramic materials include alumina, glass, zirconium oxide, etc.

[0183] The embodiments and variations have been described above. However, it should be understood that various changes can be made to the embodiments and specific circumstances without departing from the spirit and scope of the claims. As long as the function of the object of this disclosure is not affected, the above embodiments and variations can be appropriately combined and substituted. The terms "first," "second," etc., used above are only used to distinguish statements containing the above terms and are not intended to limit the number or order of the statements.

[0184] -Industry Applicability-

[0185] In summary, this disclosure is useful for rotating machinery units, compressors, and refrigeration devices.

[0186] - Symbol Explanation -

[0187] 1. Refrigeration unit

[0188] 6. Compressor

[0189] 10 Rotating machine unit

[0190] 12 First Component

[0191] 20. Housing

[0192] 20a Torso

[0193] 23. Main body of the torso

[0194] 24 Welding section

[0195] 25 recess

[0196] 26. Expanded Diameter Section

[0197] 27 convex part

[0198] 27 Weld Beads

[0199] 61 Stator Core

Claims

1. A rotating mechanical unit, characterized in that: The rotating mechanical unit includes a housing (20), a stator core (61), and a first component (12). The shell (20) has a cylindrical body (20a). The stator core (61) is fixed to the inner circumferential surface of the body (20a). The first component (12) is disposed between the inner circumferential surface of the body (20a) and the outer circumferential surface of the stator core (61). Viewed from the cylindrical axis direction of the torso (20a), the inner circumferential surface of the torso (20a) is not perfectly circular. The first component (12) is made of a material with a lower Young's modulus than the material constituting the body (20a) and the material constituting the stator core (61). The trunk (20a) has a recess (25) formed on the inner circumferential surface of the trunk (20a). The first component (12) is disposed between the recess (25) and the outer peripheral surface of the stator core (61). The torso (20a) has a torso body (23) and a welded part (24) that connects the two ends of the torso body (23) in the circumferential direction. The recess (25) is a groove (25) formed on the welded portion (24).

2. The rotating mechanical unit according to claim 1, characterized in that: The groove (25) is a cutting groove (25) formed on the inner circumferential surface of the body (20a).

3. The rotating mechanical unit according to claim 1 or 2, characterized in that: The trunk (20a) includes an enlarged portion (26) formed by enlarging the inner diameter of the inner circumferential surface of the trunk (20a).

4. The rotating mechanical unit according to claim 1 or 2, characterized in that: The material constituting the first component (12) includes a resin material.

5. The rotating mechanical unit according to claim 4, characterized in that: The material constituting the first component (12) includes a thermoplastic resin material. The stator core (61) is fixed to the inner circumferential surface of the body (20a) by hot pressing via the first component (12).

6. The rotating mechanical unit according to claim 1 or 2, characterized in that: The Young's modulus of the material constituting the first component (12) is less than 1 / 2 of the Young's modulus of the material constituting the body (20a) and the material constituting the stator core (61).

7. The rotating mechanical unit according to claim 1 or 2, characterized in that: The Young's modulus of the material constituting the first component (12) is less than 1 / 10 of the Young's modulus of the material constituting the body (20a) and the material constituting the stator core (61).

8. The rotating mechanical unit according to claim 1 or 2, characterized in that: The materials constituting the body (20a) and the stator core (61) include iron materials. The material constituting the first component (12) includes aluminum.

9. The rotating mechanical unit according to claim 1 or 2, characterized in that: The materials constituting the body (20a) and the stator core (61) are metals. The material constituting the first component (12) includes resin.

10. The rotating mechanical unit according to claim 1 or 2, characterized in that: The deviation of the inner circumferential surface of the trunk (20a) from a perfect circle is more than 0.3%.

11. The rotating mechanical unit according to claim 1 or 2, characterized in that: The deviation of the inner circumferential surface of the trunk (20a) from a perfect circle is more than 0.6%.

12. The rotating mechanical unit according to claim 1 or 2, characterized in that: The deviation of the inner circumferential surface of the trunk (20a) from a perfect circle is more than 1.0%.

13. A rotating mechanical unit, characterized in that: The rotating mechanical unit includes a housing (20), a stator core (61), and a first component (12). The shell (20) has a cylindrical body (20a). The stator core (61) is fixed to the inner circumferential surface of the body (20a). The first component (12) is disposed between the inner circumferential surface of the body (20a) and the outer circumferential surface of the stator core (61). Viewed from the cylindrical axis direction of the torso (20a), the inner circumferential surface of the torso (20a) is not perfectly circular. The first component (12) is made of a material with a lower Young's modulus than the material constituting the body (20a) and the material constituting the stator core (61). The trunk (20a) has a protrusion (27) formed on the inner circumferential surface of the trunk (20a). The first component (12) is disposed between the protrusion (27) and the outer peripheral surface of the stator core (61). The torso (20a) has a torso body (23) and a welded part (24) that connects the two ends of the torso body (23) in the circumferential direction. The protrusion (27) is a weld bead (27) formed on the welded portion (24).

14. The rotating mechanical unit according to claim 13, characterized in that: The trunk (20a) includes an enlarged portion (26) formed by enlarging the inner diameter of the inner circumferential surface of the trunk (20a).

15. The rotating mechanical unit according to claim 13 or 14, characterized in that: The material constituting the first component (12) includes a resin material.

16. The rotating mechanical unit according to claim 15, characterized in that: The material constituting the first component (12) includes a thermoplastic resin material. The stator core (61) is fixed to the inner circumferential surface of the body (20a) by hot pressing via the first component (12).

17. The rotating mechanical unit according to claim 13 or 14, characterized in that: The Young's modulus of the material constituting the first component (12) is less than 1 / 2 of the Young's modulus of the material constituting the body (20a) and the material constituting the stator core (61).

18. The rotating mechanical unit according to claim 13 or 14, characterized in that: The Young's modulus of the material constituting the first component (12) is less than 1 / 10 of the Young's modulus of the material constituting the body (20a) and the material constituting the stator core (61).

19. The rotating mechanical unit according to claim 13 or 14, characterized in that: The materials constituting the body (20a) and the stator core (61) include iron materials. The material constituting the first component (12) includes aluminum.

20. The rotating mechanical unit according to claim 13 or 14, characterized in that: The materials constituting the body (20a) and the stator core (61) are metals. The material constituting the first component (12) includes resin.

21. The rotating mechanical unit according to claim 13 or 14, characterized in that: The deviation of the inner circumferential surface of the trunk (20a) from a perfect circle is more than 0.3%.

22. The rotating mechanical unit according to claim 13 or 14, characterized in that: The deviation of the inner circumferential surface of the trunk (20a) from a perfect circle is more than 0.6%.

23. The rotating mechanical unit according to claim 13 or 14, characterized in that: The deviation of the inner circumferential surface of the trunk (20a) from a perfect circle is more than 1.0%.

24. A compressor, characterized in that: The compressor includes the rotating mechanical unit (10) as described in any one of claims 1 to 23.

25. A refrigeration device, characterized in that: The refrigeration device includes the compressor (6) as described in claim 24.

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