CN105545746A - Compressor manufacturing device and compression manufacturing method - Google Patents

Abstract

The compressor manufacturing apparatus and the compressor manufacturing method of the present invention improve the circularity of the inner diameter of the stator of the motor included in the compressor. A compressor manufacturing device (90) includes a pressing jig (91) and a pressing jig (95). The pressing jig (91) acts on the outer peripheral surface (83) of the airtight container by radial force (F) from the outside of the airtight container, thereby forming two circumferentially arranged on the inner peripheral surface (81) of the airtight container. and make the two protrusions enter the two recesses formed on the outer peripheral surface (71) of the stator (41). The pressing jig (95) exerts a radial force (G) on the inner peripheral surface (70) of the stator (41) from the inner side of the stator (41), thereby suppressing the force (F) from the pressing jig (91). The deformation of the inner peripheral surface (70) of the stator (41) is caused.

Description

Compressor manufacturing device and compressor manufacturing method

technical field

The present invention relates to a compressor manufacturing device and a compressor manufacturing method. The present invention relates to a manufacturing device and a manufacturing method of a hermetic electric compressor used in refrigeration cycle devices such as air conditioners and refrigerators, for example.

Background technique

As the existing method of fixing the stator of the motor of the hermetic electric compressor to the airtight container, there is a method of fixing the stator with an outer diameter larger than the inner diameter of the airtight container to the airtight container by shrink fitting (for example, refer to Patent Document 1 ). There is also a method of fixing a stator having an outer diameter smaller than the inner diameter of the airtight container to the airtight container by arc spot welding or laser welding.

There is also a method of fixing a stator to an airtight container without performing shrink fitting (for example, refer to Patent Document 2). In this method, a plurality of lower holes close to each other are provided on the outer peripheral surface of the stator. After locally heating the position of the airtight container facing the plurality of lower holes, the pressing jig is pressed radially inward at the position to form a convex portion engaged with the lower holes in the airtight container. The stator is fixed to the airtight container by fastening between the lower holes of the stator with the protrusions of the airtight container due to thermal contraction due to cooling of the airtight container.

Japanese Patent Application Laid-Open No. 60-159391

Japanese Patent Laid-Open No. 2007-303379

In the method of fixing the stator of the electric motor to the airtight container by shrink fitting, it is difficult to control the fastening force acting on the stator. In particular, the rigidity of the stator formed by laminating electromagnetic steel sheets is low, and the roundness of the inner diameter of the stator is deteriorated. As a result, the gap between the stator and the rotor becomes uneven, and a magnetic force imbalance occurs during the operation of the compressor. Voice. In addition, due to the difference in temperature distribution when heating the airtight container, or the release of processing deformation due to heating of components, stress is concentrated at a specific position of the stator core and iron loss occurs, which reduces the efficiency of the motor.

Even in the method of fixing the stator to the airtight container by arc spot welding or laser welding, since the tensile force caused by heat shrinkage during welding also acts on the stator, the roundness of the inner diameter of the stator is deteriorated, and thus in compression The magnetic unbalanced sound is generated during the operation of the machine. In addition, foreign matter may enter the airtight container during welding.

In the method of fixing the stator to the airtight container without shrink fitting, the protrusions of the airtight container enter the plurality of lower holes on the outer peripheral surface of the stator by pressing the clamping jig radially inward on the airtight container, but at this time There is a possibility that the inner peripheral surface of the stator is deformed, and the roundness of the inner diameter of the stator may be deteriorated.

Contents of the invention

An object of the present invention is, for example, to improve the circularity of the inner diameter of a stator of an electric motor included in a compressor.

A compressor manufacturing apparatus according to one aspect of the present invention manufactures a compressor including: a motor having a stator in which two recesses arranged in a circumferential direction are formed on an outer peripheral surface of the stator; and a compression mechanism. , which is driven by the electric motor; and a container, which houses the stator and the compression mechanism.

The above compressor manufacturing apparatus is characterized in that it includes: a pressing jig that acts a radial force on the outer peripheral surface of the container from the outside of the container, thereby forming a circumferential direction array on the inner peripheral surface of the container the two protrusions, and make the two protrusions enter the two recesses; and a pressing jig that acts a radial force on the inner peripheral surface of the stator from the inner side of the stator, thereby suppressing the force from The deformation of the inner peripheral surface of the stator caused by the force of the pressing jig.

Preferably, the two recesses are formed at a plurality of positions in the circumferential direction of the outer peripheral surface of the stator, and the pressing jig acts radially on positions corresponding to the plurality of positions on the outer peripheral surface of the container. force, and the pressing jig acts a radial force on positions corresponding to the plurality of positions on the inner peripheral surface of the stator.

Preferably, the pressing jig is configured to include a driving mechanism and an outer mold, and the outer mold is radially driven by the driving mechanism and contacts the inner peripheral surface of the stator.

Preferably, the pressing jig is configured to include a wedge-shaped extraction rod and an outer die forming a tapered hollow portion into which the extraction rod is inserted, and contacting the inner peripheral surface of the stator.

Preferably, the pressing jig forms the two protrusions when the container is heated, and the two protrusions are thermally shrunk after the container is heated, so as to sandwich the stator In the part between the two recesses, the compressor manufacturing apparatus further includes another pressing jig that acts a radial force on the outer peripheral surface of the container from the outside of the container, thereby suppressing the The deformation of the outer peripheral surface of the container caused by the thermal contraction of the two protrusions.

Preferably, the other pressing jig acts a radial force between the stator and the end closer to the stator than the compressing mechanism, among both ends in the axial direction of the container.

Another aspect of the present invention is a compressor manufacturing method for manufacturing a compressor including: a motor having a stator, and two recesses arranged in a circumferential direction are formed on the outer peripheral surface of the stator a compression mechanism driven by the electric motor; and a container for accommodating the stator and the compression mechanism, wherein the manufacturing method of the compressor is characterized in that the container is pressed from the outside of the container using a pressing jig. The radial force is applied on the outer peripheral surface, thereby forming two convex parts arranged in the circumferential direction on the inner peripheral surface of the container, and making the two convex parts enter the two concave parts, and pressing the jig from the stator The inner side of the radial force acts on the inner peripheral surface of the stator, thereby suppressing the deformation of the inner peripheral surface of the stator caused by the force from the pressing jig.

In the present invention, the pressing jig of the compressor manufacturing apparatus applies radial force to the inner peripheral surface of the stator from inside the stator, thereby suppressing the deformation of the inner peripheral surface of the stator by the force from the pressing jig. Therefore, according to the present invention, the circularity of the inner diameter of the stator can be improved.

Description of drawings

FIG. 1 is a circuit diagram of a refrigeration cycle apparatus according to Embodiment 1. FIG.

FIG. 2 is a circuit diagram of a refrigeration cycle apparatus according to Embodiment 1. FIG.

Fig. 3 is a longitudinal sectional view of the compressor according to the first embodiment.

Fig. 4 is a cross-sectional view along line A-A of Fig. 3 .

5 is a perspective view of a stator core of the stator of the electric motor according to Embodiment 1. FIG.

6 is a plan view of a stator core of the stator of the electric motor according to Embodiment 1. FIG.

FIG. 7 is a partial perspective view of the airtight container according to Embodiment 1. FIG.

Fig. 8 is a cross-sectional view of the airtight container according to Embodiment 1.

9 is a plan view of a split core of a stator of the motor according to Embodiment 1. FIG.

FIG. 10 is a plan view of the compressor manufacturing apparatus and the compressor according to Embodiment 1. FIG.

11 is a longitudinal sectional view of the compressor manufacturing apparatus and the compressor according to the first embodiment.

12 is a partial sectional view of a stator and an airtight container of the electric motor according to Embodiment 1. FIG.

13 is a partial sectional view of a stator and an airtight container of the motor according to Embodiment 1. FIG.

14 is a partial sectional view of a stator and an airtight container of the electric motor according to Embodiment 1. FIG.

Fig. 15 is a view from the direction E of Fig. 14 .

16 is a plan view of a pressing jig and a stator of an electric motor in the compressor manufacturing apparatus according to Embodiment 1. FIG.

17 is a longitudinal sectional view of a compressor manufacturing apparatus and a compressor according to Embodiment 2. FIG.

18 is a longitudinal sectional view of a compressor manufacturing apparatus and a compressor according to Embodiment 3. FIG.

Fig. 19 is a plan view of a compressor manufacturing device and a compressor according to Embodiment 4.

20 is a longitudinal sectional view of a compressor manufacturing apparatus and a compressor according to Embodiment 4. FIG.

Explanation of reference numerals: 10...refrigeration cycle device; 11a, 11b...refrigerant circuit; 12...compressor; 13...four-way valve; 14...outdoor heat exchanger; 15...expansion valve; 16...indoor heat exchanger; 17 ...control device; 20...airtight container; 21...suction pipe; 22...discharge pipe; 23...suction muffler; 24...terminal; 25...refrigerating machine oil; 26...container body; 27...container cover; 30...compression mechanism; 31... Cylinder; 32...rotary piston; 33...main bearing; 34...sub bearing; 35...discharge muffler; 36...blade; 37...blade spring; 40...electric motor; 41...stator; 42...rotor; 43...stator core; 44... Coil; 45...wire; 46...rotor core; 47...insulating parts; 48...upper end plate; 49...lower end plate; 50...crank shaft; 51...eccentric shaft; 52...main shaft; Blade groove; 62... cylinder chamber; 63... back pressure chamber; 70... inner peripheral surface; 71... outer peripheral surface; 72... recessed part; 73... notched part; 74... split core; 75... tooth part; 77...protruding part; 78...non-contact area; 79...contact area; 81...inner peripheral surface; 82...convex part; 83...outer peripheral surface; 84...processed hole; 85...riveting part; …pressing fixture; 92…front end; 93…heating range; 94…heating center; 95…pressing fixture; 96…driving mechanism; 97…outer mold;

detailed description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, the same code|symbol is attached|subjected to the same or corresponding part. In the description of the embodiments, the description of the same or corresponding parts will be appropriately omitted or simplified. In addition, in the description of the embodiment, the arrangement, orientation, etc. referred to as "upper", "lower", "left", "right", "front", "rear", "front", and "inner" are used only This is described for convenience of description, and does not limit the arrangement, orientation, and the like of devices, appliances, components, and the like. The structure, material, shape, size, and the like of devices, appliances, members, and the like can be appropriately changed within the scope of the present invention.

Embodiment 1

1 and 2 are circuit diagrams of a refrigeration cycle apparatus 10 according to this embodiment. Fig. 1 shows a refrigerant circuit 11a during cooling operation. Fig. 2 shows the refrigerant circuit 11b during heating operation.

In this embodiment, the refrigeration cycle device 10 is an air conditioner. In addition, even if the refrigeration cycle apparatus 10 is an apparatus other than an air conditioner, such as a refrigerator and a heat pump cycle apparatus, this embodiment is applicable.

As shown in FIGS. 1 and 2 , the refrigeration cycle device 10 includes refrigerant circuits 11a and 11b through which refrigerant circulates.

A compressor 12 , a four-way valve 13 , an outdoor heat exchanger 14 , an expansion valve 15 , and an indoor heat exchanger 16 are connected to the refrigerant circuits 11 a and 11 b. The compressor 12 compresses the refrigerant. The four-way valve 13 switches the direction in which the refrigerant flows during cooling operation and heating operation. The outdoor heat exchanger 14 is an example of a first heat exchanger. During cooling operation, the outdoor heat exchanger 14 operates as a condenser to dissipate heat from the refrigerant compressed by the compressor 12 . During heating operation, the outdoor heat exchanger 14 operates as an evaporator, and heats the refrigerant by exchanging heat between the outdoor air and the refrigerant expanded by the expansion valve 15 . The expansion valve 15 is an example of an expansion mechanism. The expansion valve 15 expands the refrigerant radiated by the condenser. The indoor heat exchanger 16 is an example of a second heat exchanger. During the heating operation, the indoor heat exchanger 16 operates as a condenser to dissipate heat from the refrigerant compressed by the compressor 12 . During the cooling operation, the indoor heat exchanger 16 operates as an evaporator, and heats the refrigerant by exchanging heat between the indoor air and the refrigerant expanded by the expansion valve 15 .

The refrigeration cycle device 10 further includes a control device 17 .

The control device 17 is, for example, a microcomputer. In FIG. 1 and FIG. 2 , although only the control device 17 is shown connected to the compressor 12, the control device 17 is connected not only to the compressor 12 but also to various components connected to the refrigerant circuits 11a and 11b. The control device 17 monitors or controls the state of each component.

As the refrigerant circulating in the refrigerant circuits 11a and 11b, any refrigerant such as R407C refrigerant, R410A refrigerant, or R1234yf refrigerant can be used. It is also possible to use R744 (CO ₂ ) refrigerant or R290 (propane) refrigerant.

FIG. 3 is a longitudinal sectional view of the compressor 12 . Fig. 4 is a cross-sectional view along line A-A of Fig. 3 . In addition, in FIGS. 3 and 4 , the hatching indicating the cross section is omitted. In addition, in FIG. 4, only the inside of the airtight container 20 is shown.

In the present embodiment, the compressor 12 is a one-cylinder rotary compressor. In addition, this embodiment can be applied even if the compressor 12 is a multi-cylinder rotary compressor or a scroll compressor.

As shown in FIG. 3 , the compressor 12 includes an airtight container 20 , a compression mechanism 30 , a motor 40 , and a crankshaft 50 .

The airtight container 20 is an example of a container. A suction pipe 21 for sucking in refrigerant and a discharge pipe 22 for discharging refrigerant are attached to airtight container 20 . The airtight container 20 includes: a container body 26 that is open at one end in the height direction; and a container lid 27 that is attached to the container body 26 so as to close the open end of the container body 26 .

The compression mechanism 30 is accommodated inside the airtight container 20 . Specifically, the compression mechanism 30 is provided at the inner lower portion of the airtight container 20 . Compression mechanism 30 is driven by electric motor 40 . The compression mechanism 30 compresses the refrigerant sucked into the suction pipe 21 .

The motor 40 is also accommodated inside the airtight container 20 . Specifically, the motor 40 is provided inside the airtight container 20 at a position where the refrigerant compressed by the compression mechanism 30 passes before being discharged from the discharge pipe 22 . That is, the motor 40 is provided inside the airtight container 20 and above the compression mechanism 30 . The electric motor 40 is a concentrated winding motor. In addition, even if the electric motor 40 is a distributed winding motor, this embodiment can be applied.

Refrigerator oil 25 is stored at the bottom of the airtight container 20 for lubricating the sliding parts of the compression mechanism 30 . The refrigerating machine oil 25 is sucked up by an oil pump provided below the crankshaft 50 as the crankshaft 50 rotates, and supplied to each sliding portion of the compression mechanism 30 . As the refrigerating machine oil 25 , for example, POE (polyol ester), PVE (polyvinyl ether), or AB (alkylbenzene), which are synthetic oils, are used.

Hereinafter, the compression mechanism 30 will be described in detail.

As shown in FIGS. 3 and 4 , the compression mechanism 30 includes a cylinder 31 , a rotary piston 32 , a vane 36 , a main bearing 33 , and a sub bearing 34 .

The outer periphery of the cylinder 31 is substantially circular in plan view. A cylinder chamber 62 , which is a substantially circular space in plan view, is formed inside the cylinder 31 . Both axial ends of the cylinder 31 are open.

The cylinder 31 is provided with a vane groove 61 that is connected to the cylinder chamber 62 and extends in the radial direction. A back pressure chamber 63 which is a substantially circular space in plan view and connected to the vane groove 61 is formed outside the vane groove 61 .

Although not shown, the cylinder 31 is provided with a suction port for sucking gas refrigerant from the refrigerant circuits 11a and 11b. The suction port penetrates from the outer peripheral surface of the cylinder 31 to the cylinder chamber 62 .

Although not shown, the cylinder 31 is provided with a discharge port for discharging the compressed refrigerant from the cylinder chamber 62 . The discharge port is formed so that the upper end surface of the cylinder 31 is notched.

The rotary piston 32 is annular. The rotary piston 32 moves eccentrically in the cylinder chamber 62 . The rotary piston 32 is slidably fitted to the eccentric shaft portion 51 of the crankshaft 50 .

The shape of the blade 36 is a flat substantially rectangular parallelepiped. The vane 36 is disposed in the vane groove 61 of the cylinder 31 . The vane 36 is always pressed against the rotary piston 32 by the vane spring 37 provided in the back pressure chamber 63 . Since the airtight container 20 is under high pressure, when the operation of the compressor 12 starts, the force generated by the pressure difference between the airtight container 20 and the cylinder chamber 62 acts on the surface of the vane 36 on the back pressure chamber 63 side. That is, the back of the leaf. Therefore, the vane spring 37 is mainly used for pressing the vane 36 against the rotary piston 32 when the compressor 12 is started in which there is no pressure difference between the airtight container 20 and the cylinder chamber 62 .

The main bearing 33 is substantially in an inverted T shape when viewed from the side. The main bearing 33 is slidably fitted to a main shaft portion 52 which is a portion of the crankshaft 50 above the eccentric shaft portion 51 . The main bearing 33 closes the cylinder chamber 62 of the cylinder 31 and the upper side of the vane groove 61 .

The sub-bearing 34 is substantially T-shaped when viewed from the side. The sub bearing 34 is slidably fitted to a sub shaft portion 53 that is a portion of the crankshaft 50 that is lower than the eccentric shaft portion 51 . The sub-bearing 34 closes the cylinder chamber 62 of the cylinder 31 and the lower side of the vane groove 61 .

Although not shown, the main bearing 33 is provided with a discharge valve. A discharge muffler 35 is attached to the outer side of the main bearing 33 . The high-temperature and high-pressure gas refrigerant discharged through the discharge valve temporarily enters the discharge muffler 35 and is released from the discharge muffler 35 into the space in the airtight container 20 . In addition, the discharge valve and the discharge muffler 35 may be provided on the sub-bearing 34 or both of the main bearing 33 and the sub-bearing 34 .

The material of cylinder 31, main bearing 33 and auxiliary bearing 34 is gray cast iron, sintered steel, carbon steel and the like. The material of the rotary piston 32 is, for example, alloy steel containing chromium or the like. The material of the blade 36 is, for example, high-speed tool steel.

A suction muffler 23 is provided beside the airtight container 20 . The suction muffler 23 sucks low-pressure gas refrigerant from the refrigerant circuits 11a and 11b. The suction muffler 23 suppresses the liquid refrigerant from directly entering the cylinder chamber 62 of the cylinder 31 in the event of return of the liquid refrigerant. The suction muffler 23 is connected to the suction port of the cylinder 31 via the suction pipe 21 . The main body of the suction muffler 23 is fixed to the side surface of the airtight container 20 by welding or the like.

Hereinafter, the motor 40 will be described in detail.

In this embodiment, the motor 40 is a brushless DC (Direct·Current) motor. In addition, even if the motor 40 is a motor other than a brushless DC motor, such as an induction motor, this embodiment can be applied.

As shown in FIG. 3 , the motor 40 includes a substantially cylindrical stator 41 and a substantially cylindrical rotor 42 .

The stator 41 is fixed in contact with the inner peripheral surface of the airtight container 20 . The rotor 42 is provided inside the stator 41 via a gap of about 0.3 to 1 mm.

The stator 41 includes a stator core 43 and a coil 44 . The stator core 43 is manufactured by punching out a plurality of electromagnetic steel sheets with a thickness of 0.1 to 1.5 mm mainly composed of iron into a predetermined shape, stacking them in the axial direction, and fixing them by riveting, welding, or the like. The coil 44 is wound around the stator core 43 as a concentrated winding via an insulating member 47 . The coil 44 is configured to include a core wire and at least one film covering the core wire. The material of the core wire is copper, for example. The material of the film is, for example, AI (amide imide)/EI (ester imide). The material of the insulating member 47 is, for example, PET (polyethylene terephthalate), PBT (polybutylene terephthalate), FEP (tetrafluoroethylene-hexafluoropropylene copolymer), PFA (tetrafluoroethylene Ethylene perfluoroalkyl vinyl ether copolymer), PTFE (polytetrafluoroethylene), LCP (liquid crystal polymer), PPS (polyphenylene sulfide), phenolic resin. A lead wire 45 is connected to the coil 44 .

The rotor 42 includes a rotor core 46 and permanent magnets (not shown). Like the stator core 43, the rotor core 46 is produced by punching out a plurality of electromagnetic steel plates with a thickness of 0.1 to 1.5 mm mainly composed of iron into a certain shape, stacking them in the axial direction, and riveting them together. , Welding and other fixed to make. The permanent magnets are inserted into a plurality of insertion holes formed in the rotor core 46 . The permanent magnets form the magnetic poles. As the permanent magnets, for example, ferrite magnets and rare earth magnets are used.

In order to prevent the permanent magnets from being pulled out in the axial direction, an upper end plate 48 and a lower end plate 49 are respectively provided at both ends of the rotor 42 in the axial direction, that is, the upper end of the rotor and the lower end of the rotor. The upper end plate 48 and the lower end plate 49 also serve as a rotary balancer. The upper end plate 48 and the lower end plate 49 are fixed to the rotor core 46 by a plurality of fixing rivets, not shown, or the like.

Although not shown, a shaft hole is formed at the center of the rotor core 46 in plan view, and the shaft hole is shrink-fitted or press-fitted into the main shaft portion 52 of the crankshaft 50 . A plurality of through holes penetrating substantially in the axial direction are formed around the shaft hole of the rotor core 46 . Each of the through holes serves as one of passages for the gas refrigerant released from the discharge muffler 35 to the space in the airtight container 20 .

Although not shown, when the motor 40 is configured as an induction motor, conductors made of aluminum, copper, or the like are filled or inserted into the plurality of slots formed in the rotor core 46 . Furthermore, a cage coil is formed in which both ends of the conductor are short-circuited by end rings.

On the top of the airtight container 20, a terminal 24 connected to an external power source such as an inverter device is attached. Terminal 24 is, for example, a glass terminal. The terminal 24 is fixed to the airtight container 20 by welding, for example. A lead wire 45 from the motor 40 is connected to the terminal 24 .

On the top of the airtight container 20 is installed a discharge pipe 22 which is open at both ends in the axial direction. The gas refrigerant discharged from the compression mechanism 30 is discharged from the space in the airtight container 20 to the external refrigerant circuits 11 a and 11 b through the discharge pipe 22 .

Although the details will be described later, a concave portion 72 is formed on the outer peripheral surface 71 of the stator 41 of the electric motor 40 . In order to fix the stator 41 of the motor 40 inside the airtight container 20 , the inner peripheral surface 81 of the airtight container 20 is formed with a convex portion 82 that enters the concave portion 72 .

Next, the operation of the compressor 12 will be described.

Electric power is supplied from the terminal 24 to the stator 41 of the motor 40 via the lead wire 45 . Accordingly, current flows through the coil 44 of the stator 41 , and magnetic flux is generated from the coil 44 . The rotor 42 of the motor 40 rotates by the action of the magnetic flux generated from the coil 44 and the magnetic flux generated from the permanent magnet of the rotor 42 . As the rotor 42 rotates, the crankshaft 50 fixed to the rotor 42 rotates. As the crankshaft 50 rotates, the rotary piston 32 of the compression mechanism 30 rotates eccentrically in the cylinder chamber 62 of the cylinder 31 of the compression mechanism 30 . The space between the cylinder 31 and the rotary piston 32 is divided into two by the vane 36 of the compression mechanism 30 . As the crankshaft 50 rotates, the volumes of the above two spaces change. In one space, by gradually increasing the volume, low-pressure gas refrigerant is sucked in from the suction muffler 23 . In the other space, the gas refrigerant in the space is compressed by gradually reducing the volume. The high-pressure and high-temperature gas refrigerant compressed is discharged from the discharge muffler 35 into the space in the airtight container 20 . The discharged gas refrigerant is further passed through the motor 40 and discharged to the outside of the airtight container 20 from the discharge pipe 22 located at the top of the airtight container 20 . The refrigerant discharged to the outside of the airtight container 20 returns to the suction muffler 23 again through the refrigerant circuits 11a and 11b.

Although not shown, when the compressor 12 is configured as a swing type rotary compressor, the vanes 36 are provided integrally with the rotary piston 32 . When the crankshaft 50 is driven, the vane 36 moves in and out along the receiving groove of the support body which is rotatably attached to the rotary piston 32 . The vane 36 advances and retreats in the radial direction while swinging along with the rotation of the rotary piston 32 , thereby dividing the inside of the cylinder chamber 62 into a compression chamber and a suction chamber. The support body consists of two cylindrical parts with a semicircular cross-section. The support body is rotatably fitted in a circular holding hole formed in an intermediate portion between the suction port and the discharge port of the cylinder 31 .

Hereinafter, the structure of the stator core 43 of the stator 41 of the electric motor 40, and the airtight container 20 is demonstrated sequentially.

FIG. 5 is a perspective view of the stator core 43 of the stator 41 of the electric motor 40 . FIG. 6 is a plan view of the stator core 43 of the stator 41 of the electric motor 40 .

As shown in FIGS. 5 and 6 , in this embodiment, two recesses 72 arranged in the circumferential direction are formed at a plurality of positions in the circumferential direction of the outer peripheral surface 71 of the stator core 43 , and between the two recesses 72 A notch 73 is formed between them. In addition, the outer peripheral surface 71 of the stator core 43 corresponds to the outer peripheral surface of the stator 41 of the electric motor 40 .

Each recess 72 extends in a groove shape in the axial direction.

Each notch 73 serves as one of passages for the gas refrigerant released from the discharge muffler 35 to the space in the airtight container 20 . Each notch 73 also serves as a passage for the refrigerating machine oil 25 returning from the top of the motor 40 to the bottom of the airtight container 20 .

The stator core 43 is configured by connecting a plurality of split cores 74 in the circumferential direction. That is, in the present embodiment, the stator 41 of the motor 40 has a plurality of split cores 74 that are connected in the circumferential direction to form the stator core 43 . A tooth portion 75 is formed on each split core 74 . The tooth portion 75 has a shape extending radially inward with a constant width from the base, and expanding in width at the tip. The coil 44 is wound around a portion of the tooth portion 75 extending with a constant width. When a current flows through the coil 44 , the teeth 75 around which the coil 44 is wound become magnetic poles. The direction of the magnetic poles is determined by the direction of the current flowing through the coil 44 .

In FIG. 5 and FIG. 6, as an example, the stator core 43 in which notches 73 and two recesses 72 are formed at nine positions in the circumferential direction of the outer peripheral surface 71 is shown, but the notches 73 and two recesses 72 are formed. The number of positions of the recessed part 72 can be changed suitably. In addition, in order to reliably fix the stator 41 of the motor 40 inside the airtight container 20 , it is preferable to form notches 73 and two recesses 72 at three or more positions in the circumferential direction of the outer peripheral surface 71 .

In addition, as an example, a structure in which one notch 73 is formed between the two recesses 72 is shown, but two or more notches may be formed between the two recesses 72 . Section 73 structure.

In addition, although the stator core 43 in which the nine tooth parts 75 are formed is shown as an example, the number of teeth part 75 can be changed suitably.

In addition, as an example, the stator core 43 composed of a plurality of split cores 74 is shown, but an integrated stator core 43 may also be used.

In addition, as an example, a structure in which the notch 73 and the two recesses 72 are formed on all the teeth 75 or all the split cores 74 is shown, but it is also possible to form only a part of the teeth 75 or only a part of the split cores 74 . A notch 73 and two recesses 72 are formed. In addition, when the notch 73 and the two recesses 72 are formed on all the split cores 74, compared with the case where the notch 73 and the two recesses 72 are formed on only a part of the split cores 74, the split core 74 can be improved. Cost reduction due to uniform shape.

In addition, as an example, a structure in which each concave portion 72 extends in a groove shape over the entire axial direction is shown, but a structure in which each concave portion 72 extends only in a part of the axial direction may be adopted, that is, each concave portion 72 may be formed. for the hole structure. When each concave portion 72 extends in a groove shape over the entire axial direction, compared with the case where each concave portion 72 is formed as a hole, it is possible to achieve cost reduction by unifying the shape of the laminated electromagnetic steel sheets, or to avoid electromagnetic interference. Risk of wrong assembly of steel plates.

As shown in FIGS. 5 and 6 , the recesses 72 are provided in a set of two close to each other. Hereinafter, the partial region of the outer peripheral surface 71 of the stator core 43 formed by combining the two recesses 72 and the portion sandwiched by the two recesses 72 is referred to as a fixing portion 76 . In the present embodiment, nine fixing portions 76 are provided at substantially equal intervals on the outer peripheral surface 71 of the stator core 43 . Therefore, there are eighteen recesses 72 in total. Six of the 18 are used to fix the stator 41 of the motor 40 inside the airtight container 20 .

FIG. 7 is a partial perspective view of the airtight container 20 . FIG. 8 is a cross-sectional view of the airtight container 20 . In addition, FIG. 7 shows only a part of the airtight container 20 in the axial direction. The axial direction of the airtight container 20 refers to the height direction of the airtight container 20 . The axial direction of the airtight container 20 is parallel to the axial direction of the stator 41 of the motor 40 . In FIG. 8 , hatching indicating a section is omitted.

As shown in FIGS. 7 and 8 , in the present embodiment, two protrusions 82 arranged in the circumferential direction are formed at a plurality of positions in the circumferential direction of the inner peripheral surface 81 of the airtight container 20 . The stator 41 of the motor 40 is fixed to the airtight container 20 by inserting the two protrusions 82 into the two recesses 72 shown in FIG. 5 and FIG. inside.

On the outer peripheral surface 83 of the airtight container 20, there is a processing hole 84 at a position corresponding to each convex portion 82, and the processing hole 84 is formed by pressing the outer peripheral surface 83 in order to form each convex portion 82 on the inner peripheral surface 81. .

In FIG. 7 and FIG. 8 , as an example, three positions in the circumferential direction of the inner peripheral surface 81 are shown, and the airtight container 20 in which two convex portions 82 are formed, but the positions where the two convex portions 82 are formed can be Change appropriately. In addition, in order to securely fix the stator 41 of the motor 40 inside the airtight container 20 , it is preferable to form two convex portions 82 at three or more positions in the circumferential direction of the inner peripheral surface 81 .

As shown in FIG. 7 and FIG. 8 , although the convex portions 82 are provided in a group of two close to each other, as will be described later, the convex portions 82 are formed by setting the stator 41 of the motor 40 in the airtight container 20 . In the inner state, the outer peripheral surface 83 of the airtight container 20 is pressed into the inner side of the airtight container 20 and formed. The set of two protrusions 82 enters the set of two recesses 72, thereby forming two riveting points. Hereinafter, a partial region of the inner peripheral surface 81 of the airtight container 20 formed by combining the two protrusions 82 forming the caulking point is referred to as a caulking portion 85 . In the present embodiment, three caulking portions 85 are provided approximately at equal intervals on the inner peripheral surface 81 and the outer peripheral surface 83 of the airtight container 20 . Therefore, there are six convex portions 82 in total.

FIG. 9 is a plan view of the split core 74 of the stator 41 of the motor 40 .

As described above, in this embodiment, at a plurality of positions corresponding to each other on the stator 41 of the motor 40 and the airtight container 20 , the two protrusions 82 enter the two recesses 72 , and the stator 41 of the motor 40 is sandwiched by a cutout formed therein. The portion of the notch 73 is used to fix the stator 41 of the motor 40 inside the airtight container 20 . In the absence of the notch 73, the portion between the two recesses 72 is fastened by the two protrusions 82, whereby the stress concentrates at the position B shown in FIG. inner end. Since the position B is originally a position where the magnetic flux from the magnetic poles formed on the tooth portion 75 flows, if stress concentrates at this position, hysteresis loss occurs. The hysteresis loss refers to a situation in which magnetic flux is difficult to flow at a position where stress is concentrated due to an increase in reluctance, and a loss occurs. Hysteresis loss is so-called iron loss, and it becomes an important factor which reduces the efficiency of a motor. On the other hand, in this embodiment, since the notch 73 is provided between the two recesses 72, stress can be concentrated at the position C shown in FIG. Since the position C is where the magnetic flux from the magnetic pole leaves the flow path, hysteresis loss hardly occurs even if stress is concentrated at this position. In addition, if the stress is concentrated at the C position, the stress acting on the B position can be greatly reduced. Therefore, occurrence of iron loss can be avoided, and reduction in motor efficiency can be suppressed.

In addition, as shown in FIG. 9 , in this embodiment, a protruding portion 77 is formed in a region between the notch portion 73 and the two concave portions 72 of the outer peripheral surface 71 of the split core 74 constituting the stator core 43 . The protruding portion 77 protrudes radially outward from other regions of the outer peripheral surface 71 of the split core 74 . The stator 41 of the motor 40 can be more reliably fixed inside the airtight container 20 by the inner peripheral surface 81 of the airtight container 20 being in contact with the protruding portion 77 . In addition, instead of the entire outer peripheral surface 71 of the stator 41 being in contact with the inner peripheral surface 81 of the airtight container 20 , the roundness of the inner diameter of the stator 41 is improved by making the protrusion 77 contact the inner peripheral surface 81 of the airtight container 20 . That is, in this embodiment, since the two protrusions 82 formed in the airtight container 20 sandwich the portion of the stator 41 where the notch 73 is formed, even if the fastening force acting on the stator 41 from the airtight container 20 is low , the stator 41 can also be fixed inside the airtight container 20 . Therefore, by making the inner peripheral surface 81 of the airtight container 20 contact the outer peripheral surface 71 of the stator 41 and reducing the contact area, it is possible to securely fix the stator 41 and improve the circularity of the inner diameter of the stator 41 . By limiting the area of the outer peripheral surface 71 of the stator 41 that contacts the inner peripheral surface 81 of the airtight container 20 to the protrusion 77 , the contact area can be reduced.

In this embodiment, the area between the notch 73 and the two recesses 72 of the outer peripheral surface 71 of the split core 74 constituting the stator core 43 is divided into: The non-contact area 78 and the contact area 79 connected to one of the two recesses 72 and formed with the protrusion 77 are formed. In addition, although the positional relationship between the non-contact area 78 and the contact area 79 may be reversed, when the non-contact area 78 is located on the side of the concave portion 72 , the convex portion 82 does not enter the base of the concave portion 72 . Therefore, in order to increase the fastening force by the convex portion 82 , it is preferable to provide the contact region 79 on the concave portion 72 side. The area ratio of the non-contact area 78 and the contact area 79 can be set arbitrarily.

In the present embodiment, the stator 41 of the motor 40 is fitted inside the airtight container 20 by shrink fitting, so that the inner peripheral surface 81 of the airtight container 20 contacts the protrusion 77 . Here, shrink-fitting refers to a method in which the stator 41 is inserted into the airtight container 20 in a state where the airtight container 20 having an inner diameter smaller than the outer diameter of the stator 41 is heated to thermally expand, and then the airtight container 20 is used for thermal contraction, The stator 41 is fixed to the airtight container 20 . In the case where the stator 41 of the motor 40 is fixed inside the airtight container 20 only by shrink fitting, the gap between the stator 41 and the rotor 42 may become uneven due to the poor roundness of the inner diameter of the stator core 43 , causing a magnetic unbalanced sound. However, in this embodiment, since the stator 41 of the motor 40 and a plurality of positions of the airtight container 20 correspond to each other, the two protrusions 82 enter the two recesses 72 and sandwich the stator 41 of the motor 40 to form a notch. 73, thereby reducing the degree of fixation based on thermal charging. That is, it is possible to limit the tightening position of the shrink fitting on the outer peripheral surface 71 of the stator core 43 to only the contact area 79 . Assuming that there is no non-contact area 78, but the notch 73 of the outer peripheral surface 71 of the split core 74 and the area between the two recesses 72 are in contact with the inner peripheral surface 81 of the airtight container 20 as a whole. Compared with the structure in which the stator 41 of the motor 40 is fixed inside the airtight container 20 by shrink fitting, the area of the fastening position of shrink fitting can also be reduced. Therefore, the circularity of the inner diameter of the stator core 43 can be improved, and the generation of magnetic unbalance noise can be suppressed. In addition, the stator 41 of the electric motor 40 may be fitted inside the airtight container 20 by cold fitting.

In the present embodiment, the two recesses 72 are separately arranged on both sides of the center position in the circumferential direction of the plurality of split cores 74 . In addition, in FIG. 9 , a center line indicating the center position of the split core 74 in the circumferential direction is indicated by a dashed-dotted line D. As shown in FIG.

In addition, the two recesses 72 of the stator 41 of the motor 40 may not have the notch 73 . Regardless of the presence or absence of the notch 73, the two protrusions 82 are sandwiched between the two recesses 72 of the stator 41 by making the two protrusions 82 enter the two recesses 72 at a plurality of positions corresponding to each other in the stator 41 of the motor 40 and the airtight container 20. The part between, thereby fixing the stator 41 of the motor 40 inside the airtight container 20 .

Hereinafter, the configuration of the apparatus for manufacturing the compressor 12 , the method for manufacturing the compressor 12 , and the effects obtained by the apparatus and the method will be described in order.

Explanation of the structure

FIG. 10 is a plan view of a compressor manufacturing device 90 and the compressor 12 according to the present embodiment, which are devices for manufacturing the compressor 12 . FIG. 11 is a longitudinal sectional view of the compressor manufacturing apparatus 90 and the compressor 12 . In addition, FIGS. 10 and 11 show the compressor 12 in simplified form during manufacture.

As shown in FIGS. 10 and 11 , the compressor manufacturing apparatus 90 includes a pressing jig 91 as a pressing press, and a pressing jig 95 as a lining jig.

The pressing jig 91 acts a radial force F on the outer peripheral surface 83 of the airtight container 20 from the outside of the airtight container 20, thereby forming two protrusions aligned in the circumferential direction on the inner peripheral surface 81 of the airtight container 20 as will be described later. 82, and make the two convex portions 82 enter the two concave portions 72. At this time, the airtight container 20 is in a state where the container body 26 is not attached to the container lid 27 . The pressing jig 95 acts a radial force G on the inner peripheral surface 70 of the stator 41 from the inner side of the stator 41, thereby suppressing deformation of the inner peripheral surface 70 of the stator 41 due to the force F from the pressing jig 91 as will be described later. .

As described above, the two recesses 72 are formed at a plurality of positions in the circumferential direction of the outer peripheral surface 71 of the stator 41 . Therefore, the pressing jig 91 causes the radial force F to act on the positions corresponding to the plurality of positions on the outer peripheral surface 83 of the airtight container 20 . The pressing jig 95 causes a radial force G to act on positions corresponding to the plurality of positions on the inner peripheral surface 70 of the stator 41 . In the present embodiment, the pressing jig 91 applies the radial force F to three positions on the outer peripheral surface 83 of the airtight container 20 . The pressing jig 95 causes a radial force G to act on at least three positions of the inner peripheral surface 70 of the stator 41 .

The pressing jig 95 includes a drive mechanism 96 and an outer die 97 driven in the radial direction by the drive mechanism 96 and in contact with the inner peripheral surface 70 of the stator 41 . The aforementioned radial force G is the pressing force of the outer die 97 against the inner peripheral surface 70 of the stator 41 . The more the outer mold 97 is driven radially outward by the driving mechanism 96, the greater the pressing force is, and the more the outer mold 97 is driven radially inward by the driving mechanism 96, the smaller the pressing force is. The radial force G can thus be appropriately adjusted by the drive mechanism 96 .

As the driving mechanism 96, any mechanism can be adopted as long as it can drive the outer mold 97 in the radial direction. For example, a mechanism in which the outer die 97 is radially driven by oil pressure or air pressure may be used, or a mechanism such as in Embodiment 2 or 3 described later may be used.

Description of the method

As a method of manufacturing the compressor 12 , that is, the steps included in the compressor manufacturing method of the present embodiment include the following steps.

Storage step: a step of storing the compression mechanism 30 inside the airtight container 20 . In addition, the airtight container 20 is the state which does not attach the container lid 27, and only has the container main body 26.

Installation step: a step of installing the stator 41 of the motor 40 inside the airtight container 20 .

Machining step: heating a plurality of locations in the circumferential direction of the inner peripheral surface 81 of the airtight container 20 and processing the heated locations to form two convex portions 82 entering the two concave portions 72 . In this process, the radial force F acts on the outer peripheral surface 83 of the airtight container 20 from the outside of the airtight container 20 by pressing the jig 91, thereby forming two rings arranged in the circumferential direction on the inner peripheral surface 81 of the airtight container 20. The two convex portions 82 are inserted into the two concave portions 72 . Simultaneously, radial force G acts on the inner peripheral surface 70 of the stator 41 from inside the stator 41 by the pressing jig 95 , thereby suppressing deformation of the inner peripheral surface 70 of the stator 41 caused by the force F from the pressing jig 91 .

Fixing process: the two protrusions 82 are heat-shrunk, and the stator 41 of the motor 40 is fixed to the inner side of the airtight container 20 by sandwiching the part of the stator 41 of the motor 40 where the notch 73 is formed by the two protrusions 82 process.

Closing step: a step of closing one end of the opening of the container body 26 with the container cap 27 .

The above five steps are carried out in the order of storage step, installation step, processing step, fixing step, and sealing step.

Hereinafter, the processing step and the fixing step will be described.

12 , 13 and 14 are partial sectional views of the stator 41 of the motor 40 and the airtight container 20 in each process for fixing the stator 41 of the electric motor 40 inside the airtight container 20 . 12 , 13 and 14 specifically show a part of the cross section of the stator core 43 of the stator 41 and a part of the cross section of the container main body 26 of the airtight container 20 . In addition, in FIG. 12, FIG. 13, and FIG. 14, the hatching which shows a cross section is abbreviate|omitted.

In the processing step, as shown in FIG. 12 , in the outer peripheral surface 83 of the airtight container 20, a certain range centered on a position corresponding to the center position between the two recessed parts 72 of each fixing part 76, from the airtight The outer side of the container 20 locally heats the portion of the airtight container 20 that faces each fixing portion 76 . After the airtight container 20 is thermally expanded by heating, as shown in FIG. 13 , the compression jig 91 is pressed straight toward the two recesses 72 from the outside of the airtight container 20 . Specifically, the two front ends 92 of the pressing jig 91 having a width slightly smaller than that of the concave portion 72 and having a quadrangular flat surface are simultaneously pressed toward the two concave portions 72 . Thereby, as shown in FIG. 14 , a processed hole 84 having a width equal to that of the front end portion 92 of the pressing jig 91 is formed in the outer peripheral surface 83 of the airtight container 20 . Two convex portions 82 entering into the two concave portions 72 are formed on the inner peripheral surface 81 of the airtight container 20 . That is, a caulking portion 85 having two caulking points is formed. One pressing jig 91 is used for each of the three fixing portions 76 . That is, three caulking portions 85 are formed with three pressing jigs 91 . The three caulking portions 85 are formed by pressing three pressing jigs 91 at three positions on the outer peripheral surface 71 of the stator core 43 almost simultaneously.

In the fixing step, as shown in FIG. 14 , the thermally expanded airtight container 20 is cooled. When the airtight container 20 is cooled, the two convex portions 82 are drawn closer toward the center of the heated range by thermal contraction. The adjacent two recesses 72 of the fixing part 76 are thus fastened in the circumferential direction by the two protrusions 82 . Thereby, the stator 41 of the electric motor 40 including the stator core 43 is fixed to the airtight container 20 . Since the stator 41 of the motor 40 is fixed by radial force rather than the stator 41 of the motor 40 by force in the circumferential direction as in the existing shrink-fit fixing method, the force applied to the stator core 43 can be reduced. deformation. In addition, unlike the conventional fixing methods by arc spot welding and laser welding, since the airtight container 20 is not perforated, there is no fear of contamination of foreign matter or leakage of refrigerant.

Fig. 15 is a view from the direction E of Fig. 14 . That is, FIG. 15 is a view of the outer peripheral surface 83 of the airtight container 20 viewed from the direction E shown in FIG. 14 .

As shown in FIG. 15 , in the processing step, the airtight container 20 is locally heated, for example, the airtight container 20 is softened by the influence of heat in a circular heating range 93 . When both front end portions 92 of the pressing jig 91 are pressed against the heating range 93 , two processed holes 84 approaching each other are formed on the outer peripheral surface 83 of the airtight container 20 . Two protrusions 82 are formed at corresponding positions on the inner peripheral surface 81 of the airtight container 20 . In the fixing process, the airtight container 20 is cooled, and the two protrusions 82 are pulled toward the heating center 94 .

In the processing step, when the pressing amount H of the pressing jig 91 is increased (see FIG. 14 ), the thickness K (see FIG. 14 ) of the minimum wall thickness portion of the airtight container 20 gradually decreases. Here, the thickness K of the minimum wall thickness portion refers to the distance between the root of the convex portion 82 formed in the airtight container 20 and the processing hole 84 . As the depth J (see FIG. 14 ) of the processed hole 84 increases, the press-fitting amount H increases. In addition, the depth J of the processed hole 84 is substantially equal to the protruding length of the convex portion 82 from the inner peripheral surface 81 . Furthermore, the thickness K of the minimum thickness portion is determined by the depth J of the processed hole 84 . The processing hole 84 must be formed on the basis of ensuring the pressing amount H, and the thickness K of the minimum wall thickness portion becomes a value smaller than the plate thickness of the airtight container 20 by approximately the depth J of the processing hole 84 . If the depth J of the processing hole 84 is increased in order to increase the press-in amount H, the thickness K of the minimum wall thickness portion of the airtight container 20 becomes thinner, so that when the internal pressure acts on the airtight container 20, the refrigerant may flow from the airtight container 20. Leakage at the smallest wall thickness. Therefore, the maximum allowable value of the depth J of the processed hole 84 is determined within a range that can satisfy the required compressive strength of the airtight container 20 . When the thickness K of the minimum wall thickness portion is 0.5 times or more the plate thickness of the airtight container 20 , the compressive strength of the airtight container 20 can usually be sufficiently satisfied. For example, if the plate thickness of the airtight container 20 is 2.6 mm, the depth J of the processed hole 84 may be 1.3 mm or less. Therefore, the pressing amount H is also 0.5 times or less the plate thickness of the airtight container 20 .

In the present embodiment, the fixing portions 76 are formed at three positions on the outer peripheral surface 71 of the stator 41 , but the three positions are preferably arranged at equal intervals of 120°. As shown in FIG. 13 , in the processing step, the front end portion 92 of the pressing jig 91 directly contacts the airtight container 20 to plastically deform the airtight container 20 . Thus, the caulking portion 85 is formed at three positions. Since two riveting points are formed at one location, the total number of riveting points is six. One crimping jig 91 is used for one caulking portion 85 . That is, a total of three pressing jigs 91 are provided. As shown in FIG. 10 , the force F applied to the airtight container 20 from the pressing jig 91 acts toward the center of the airtight container 20 . The three forces F are equal in magnitude.

FIG. 16 is a plan view of the pressing jig 95 of the compressor manufacturing apparatus 90 and the stator 41 of the motor 40 in the manufacturing process. FIG. 16 specifically shows the drive mechanism 96 of the pressing jig 95 , the outer die 97 , and the stator core 43 of the stator 41 .

Since the rigidity of the stator 41 formed by laminating electromagnetic steel sheets is low, when the front end portion 92 of the pressing jig 91 is pressed against the outer peripheral surface 83 of the airtight container 20 in the radial direction, the inner peripheral surface 70 of the stator 41 may be deformed. , so that the circularity of the inner diameter of the stator 41 deteriorates. As a countermeasure against this, in this embodiment, as shown in FIG. 16 , a force G is applied radially to the inner peripheral surface 70 of the stator 41 , and a pressing jig 95 is used to suppress deformation of the inner peripheral surface 70 of the stator 41 .

The pressing jig 95 has an outer die 97 that is driven in the radial direction of the stator 41 by a drive mechanism 96 and that exerts a force G. As shown in FIG. At least a part of the outer mold 97 is divided into the same number as the teeth 75 formed in the stator core 43 . In order to be in contact with the inner peripheral surface 70 of the stator 41 , the outer peripheral shape of the divided portion of the outer mold 97 has the same arc shape as the inner peripheral shape of the tooth portion 75 . The divided portion of the outer mold 97 of the pressing jig 95 presses the facing tooth portions 75 with an appropriately set force G. In addition, among the divided parts of the outer mold 97 of the pressing jig 95 , only a part may be in contact with the tooth part 75 , and the remaining part may not be in contact with the tooth part 75 . That is, there may be a position where G=0.

Explanation of the effect

Hereinafter, effects achieved by the present embodiment will be described.

In the present embodiment, the pressing jig 95 of the compressor manufacturing apparatus 90 makes the radial force G act on the inner peripheral surface 70 of the stator 41 from the inner side of the stator 41, thereby suppressing the force F from the pressing jig 91. Deformation of the inner peripheral surface 70 of the stator 41 . Therefore, according to the present embodiment, the circularity of the inner diameter of the stator 41 can be improved.

In this embodiment, two protrusions 82 are formed to enter into two recesses 72 provided on the outer peripheral surface 71 of the stator 41 , and are fixed by a portion where the two protrusions are sandwiched between the two recesses 72 . Therefore, according to the present embodiment, arc spot welding or laser welding that generates foreign matter can be eliminated, and it is possible to manufacture the highly reliable compressor 12 with a small amount of foreign matter. In addition, since the retaining force of the stator 41 can be sufficiently ensured, the contact area between the outer peripheral surface 71 of the stator 41 and the inner peripheral surface 81 of the airtight container 20 by shrink fitting can be greatly reduced. Therefore, the fastening force of the stator 41 by shrink fitting can be greatly reduced, and the compressor 12 with higher performance can be manufactured.

In this embodiment, when forming the two protrusions 82 that enter the two recesses 72 provided on the outer peripheral surface 71 of the stator 41, the force G acts from the inner side of the stator 41, thereby reducing the roundness of the inner diameter of the stator 41. worse. Therefore, according to the present embodiment, it is difficult to generate a magnetic unbalance sound during operation, and it is possible to manufacture the compressor 12 with higher reliability.

In this embodiment, the two protrusions 82 formed in the airtight container 20 of the compressor 12 enter the two recesses 72 formed in the stator 41 of the motor 40 of the compressor 12, and are sandwiched between the two recesses 72. The stator 41 of the motor 40 is fixed to the inner side of the airtight container 20 at the part where the notch 73 is formed. Since the notch 73 is provided, the stress concentration which becomes an important factor of a loss is alleviated. In addition, in the area between the notch 73 and the two recesses 72 of the outer peripheral surface 71 of the stator 41 , a protruding portion 77 protruding radially outward than other areas of the outer peripheral surface 71 of the stator 41 is formed. . Instead of the entire outer peripheral surface 71 of the stator 41 being in contact with the inner peripheral surface 81 of the airtight container 20 , the protruding portion 77 is brought into contact with the inner peripheral surface 81 of the airtight container 20 to improve the circularity of the inner diameter of the stator 41 . Therefore, according to the present embodiment, reduction in motor efficiency can be suppressed.

According to the present embodiment, by minimizing the generation of iron loss and the deterioration of the inner diameter roundness of the stator 41 of the electric motor 40 , it is possible to obtain a hermetic electric compressor with high motor efficiency and low noise. It is possible to provide a hermetic electric compressor that does not cause problems such as increased noise and vibration due to chattering of the stator 41 of the motor 40 even for a long-term use, has high reliability, and reduces the amount caused by the stator. Iron loss due to stress concentration of 41, hermetic electric compressor with excellent electrical efficiency.

According to the present embodiment, by using the close two protruding parts 82 of the airtight container 20, sufficient clamping force is generated between the two concave parts 72 of the stator 41 of the motor 40, so that the stator 41 of the motor 40 can be firmly fixed to the Airtight container 20. It is possible to obtain a compressor 12 that can withstand ordinary and excessive forces generated during operation without causing vibrations caused by chattering of the stator 41 of the motor 40 even when the hermetic electric compressor is used for a long period of time. The compressor 12 with high reliability for adverse situations such as increased noise and vibration. In addition, since the force received by the stator 41 of the electric motor 40 can be reduced and the occurrence of iron loss due to stress concentration can be suppressed, performance can be improved.

The material of the airtight container 20 is generally iron. From around 600°C, the yield point of iron drops sharply. Here, the temperature at which the yield point begins to drop sharply is called the softening temperature. That is, the temperature at which iron softens is 600°C. In order to lower the yield point of the material of the airtight container 20 and efficiently deform the airtight container 20 into a constant shape, the temperature at the time of heating should be not less than the softening temperature of the material and lower than the melting point. The yield point is lowered by heating to plastically deform the airtight container 20 , and the springback in the radial direction of the airtight container 20 after the convex portion 82 is formed, that is, the return of the convex portion 82 is suppressed. In addition, a constant pushing amount H can be ensured efficiently and reliably (see FIG. 14 ). Here, the pushing amount H refers to the depth at which the convex portion 82 enters the concave portion 72 . As mentioned above, the material of the airtight container 20 is iron, and its softening temperature is 600°C. Moreover, the melting point of iron is about 1560°C. Therefore, the heating temperature of local heating is preferably 600°C or higher and 1500°C or lower. Of course, if the material is a material other than iron, the heating temperature will change, but it is preferably not less than the softening temperature of the material and less than the melting point.

The heating range 93 includes all the processing holes 84 to be the pressing parts of the pressing jig 91 , so that the protrusions 82 can be reliably formed using the characteristics of the material of the airtight container 20 as described above when the material is high temperature. In addition, the press-fitting force for forming the convex portion 82 is reduced, so that deformation of the stator core 43 during assembly of the compressor 12 can be reduced. In addition, by setting the heating center 94 of the airtight container 20 at a position overlapping the centers of the two concave portions 72, after the two convex portions 82 are reliably formed in the airtight container 20, the two convex portions 82 that thermally shrink toward the heating center 94 can be utilized. The convex portion 82 is firmly sandwiched between the two concave portions 72 .

By reliably forming the convex portion 82 of the airtight container 20 in this way, and firmly clamping the convex portion 82 of the airtight container 20 between the concave portions 72 of the stator 41 of the motor 40, the stator 41 of the motor 40 is fixed, so the compression for long-term use The compressor 12 is capable of withstanding normal and excessive forces generated during the operation of the compressor 12, and enables stable fixing of the stator 41 of the electric motor 40 without chattering. In addition, even when shrink fitting is also used for fixing the stator 41 , the contact area of the stator 41 and the shrink fitting of the airtight container 20 can be significantly reduced compared with conventional ones.

The stator 41 of the motor 40 is supported by the convex portion 82 of the airtight container 20 relative to the axial direction of the compressor 12, and the stator 41 of the motor 40 is not only supported by the convex portion 82 of the airtight container 20 with respect to the tangential direction. The support by sandwiching is also supported by the rigidity of the convex portion 82 of the airtight container 20 . The fixing shape may be selected so that the required fixing strength is obtained in accordance with the acceleration generated in the fixing portion 76 . For example, the fixing strength can be increased by increasing the cross-sectional area of the protrusion 82 or increasing the number of fixing parts 76 . In addition, the width of the concave portion 72 of the stator 41 can be selected so as to satisfy the specification of the detachment strength for the conveyance, drop, etc. of the compressor 12 that generates axial acceleration.

In addition, in the present embodiment, in order to form a plurality of groove-shaped recesses 72 at a plurality of positions of the stator core 43, the stator core 43 can be formed by laminating the same type of electrical steel sheets without preparing many types, so it is possible to Suppressing costs can also further reduce the risk of assembly errors.

In addition, in this embodiment, in order to ensure a higher fixing strength between the stator 41 and the airtight container 20, after the stator 41 and the airtight container 20 are heat-fitted in the above-mentioned installation process, the processing process and the fixing process are carried out. not necessary.

In the case of shrink fitting, after shrink fitting the stator 41 and the airtight container 20 , the position corresponding to the concave portion 72 of the stator 41 on the outer peripheral surface 83 of the airtight container 20 is locally heated. Then, the pressing jig 91 is pressed radially inward against the outer peripheral surface 83 of the airtight container 20 , and the convex portion 82 that engages with the concave portion 72 is formed in the airtight container 20 . Furthermore, the plurality of convex portions 82 of the airtight container 20 fasten between the concave portions 72 due to thermal contraction due to cooling of the airtight container 20 . Thereby, the stator 41 can be firmly fixed to the airtight container 20, and at the time of fixing by thermal contraction, the stator 41 can be stably fixed to the airtight container 20 without rattling.

In the present embodiment, since the stator 41 is only required to be shrink-fitted to the airtight container 20 with a strength to the extent that slight vibration does not occur between the stator 41 and the convex portion 82 of the airtight container 20 during heat shrinkage, it is compatible with Compared with the case where only conventional shrink fitting is used for fixing, the contact area between the stator 41 and the airtight container 20 by shrink fitting can be greatly reduced. Therefore, the stress acting on the stator 41 can be reduced, and the performance of the compressor 12 can be improved.

In the present embodiment, the stator core 43 is formed by joining a plurality of T-shaped split cores 74 into an annular shape. The recessed portion 72 formed on the outer peripheral surface 71 of the stator core 43 is provided in each split core 74 . Assuming that the adjacent two concave parts 72 are formed across the two split cores 74, since the force acting when the corresponding two convex parts 82 thermally shrink acts in such a manner as to push the two split cores 74 against each other, it is possible to make the stator The roundness of the inner diameter of the core 43 deteriorates. On the other hand, as shown in FIG. 9 , when two concavities 72 adjacent to each other are formed on one split core 74 so as to sandwich the center position in the circumferential direction of one split core 74 , even if the corresponding two Even when the convex portion 82 is thermally shrunk, the rigidity of the one split core 74 can maintain good inner diameter circularity, so that the generation of magnetic unbalance sound can be suppressed.

In the present embodiment, as described above, instead of providing the recessed portion 72 of the stator 41 in the shape of a groove, for example, it may be provided in the form of a quadrangular lower hole. Also in this case, the stator 41 can be fixed to the airtight container 20 similarly. For example, the quadrangular lower hole of the stator 41 can be formed by laminating two types of electromagnetic steel sheets. By making the lower hole of the stator 41 a quadrangular shape, the stator 41 is not only clamped by the convex portion 82 of the airtight container 20, but also can be supported by the rigidity of the convex portion 82 of the airtight container 20 itself, so it can be held more firmly. The stator 41 is fixed to the airtight container 20 .

Embodiment 2

Regarding this embodiment, differences from Embodiment 1 will be mainly described.

FIG. 17 is a longitudinal sectional view of the compressor manufacturing apparatus 90 and the compressor 12 according to this embodiment. In addition, FIG. 17 shows the compressor 12 in the process of manufacture in a simplified manner similarly to FIG. 11 .

As shown in FIG. 17 , the drive mechanism 96 of the pressing jig 95 of the compressor manufacturing apparatus 90 may be mounted as a chuck mechanism.

Embodiment 3

Regarding this embodiment, differences from Embodiment 1 will be mainly described.

FIG. 18 is a longitudinal sectional view of the compressor manufacturing apparatus 90 and the compressor 12 according to this embodiment. In addition, FIG. 18 shows the compressor 12 in the process of manufacture in a simplified manner similarly to FIG. 11 .

As shown in FIG. 18, the driving mechanism 96 of the pressing jig 95 of the compressor manufacturing apparatus 90 may be installed as a wedge mechanism. That is, in the present embodiment, the pressing jig 95 is configured to include a wedge-shaped extraction rod 98 and an outer die 97 that forms a tapered hollow portion into which the extraction rod 98 is inserted, and is in contact with the inner peripheral surface 70 of the stator 41 . touch. When the extraction rod 98 is drawn downward from the hollow portion of the outer mold 97 , the outer mold 97 is driven in the radial direction by a wedge effect, and the force G acts on the inner peripheral surface 70 of the stator 41 .

Embodiment 4

Regarding this embodiment, differences from Embodiment 1 will be mainly described.

FIG. 19 is a plan view of the compressor manufacturing apparatus 90 and the compressor 12 according to this embodiment. FIG. 20 is a longitudinal sectional view of the compressor manufacturing device 90 and the compressor 12 . In addition, FIGS. 19 and 20 are similar to FIGS. 10 and 11 , and show the compressor 12 in the process of manufacture in simplified form. The pressing jig 91 is omitted in FIG. 19 .

As shown in FIGS. 19 and 20 , the compressor manufacturing apparatus 90 includes the same pressing jig 91 and pressing jig 95 as those in Embodiment 1, and also includes another pressing jig 99 that is a pressing punch.

As in Embodiment 1, when the container main body 26 is locally heated and then pressurized by the pressing jig 91, the opening of the container main body 26 is affected by the pressurization of the pressing jig 91, the thermal contraction of the container main body 26, and the like. The ends may be deformed. In this embodiment, in order to reduce the amount of deformation, the upper end surface of the stator 41 and the upper end surface of the airtight container 20 are clamped by the pressing jig 99 from the outside of the airtight container 20, and the force I is applied.

That is, the pressing jig 91 forms the two protrusions 82 in a state where the airtight container 20 is heated. The two protrusions 82 are heat-shrunk after the airtight container 20 is heated, and are sandwiched between the two recesses 72 of the stator 41 . At this time, a force deforming the airtight container 20 acts. Therefore, in this embodiment, as shown in FIG. 19 , the pressing jig 99 acts on the outer peripheral surface 83 of the airtight container 20 from the outside of the airtight container 20 by the pressing jig 99 , thereby suppressing the thermal contraction caused by the two protrusions 82 . The deformation of the outer peripheral surface 83 of the airtight container 20 is caused. Specifically, as shown in FIG. 20 , the pressing jig 99 causes a radial force I to act between the stator 41 and the end closer to the stator 41 than the compression mechanism 30 at both ends in the axial direction of the airtight container 20 . Here, the end closer to the stator 41 than the compression mechanism 30 among both ends in the axial direction of the airtight container 20 refers to the open end of the container body 26 . For example, as shown in FIG. 20 , the pressing jig 99 causes the radial force I to act on the inner peripheral surface 70 of the stator 41 at four positions spaced apart at equal intervals. That is, four pressing jigs 99 are arranged at equal intervals, and the closed container 20 is clamped by these pressing jigs 99 . Thereby, deformation of the airtight container 20 can be suppressed. In addition, the number of positions where the radial force I acts, that is, the number of pressing jigs 99 is not limited to four, and may be two or more.

As mentioned above, although embodiment of this invention was described, some of these embodiment can be combined and implemented. Alternatively, any one or several of these embodiments may be partially implemented. For example, in the description of these embodiments, only any one of the members described as "parts" may be used, or any combination of several may be used. In addition, this invention is not limited to these embodiment, It can change variously as needed.

Claims (7)

1. A compressor manufacturing device that manufactures the following compressors, The compressor includes: an electric motor having a stator, and two recesses arranged in a circumferential direction on the outer peripheral surface of the stator; a compression mechanism driven by the electric motor; and a container for accommodating the stator and the stator. the compression mechanism, The compressor manufacturing device is characterized in that it has: A compression jig, which exerts a radial force on the outer peripheral surface of the container from the outside of the container, thereby forming two protrusions arranged in the circumferential direction on the inner peripheral surface of the container, and making the two protrusions the convex portion enters the two concave portions; and A pressing jig exerts a radial force on the inner peripheral surface of the stator from inside the stator, thereby suppressing deformation of the inner peripheral surface of the stator caused by the force from the pressing jig. 2. The compressor manufacturing apparatus according to claim 1, wherein: The two recesses are formed at a plurality of positions in the circumferential direction of the outer peripheral surface of the stator, The pressing jig acts a radial force on positions corresponding to the plurality of positions on the outer peripheral surface of the container, The pressing jig acts a radial force on positions corresponding to the plurality of positions on the inner peripheral surface of the stator. 3. The compressor manufacturing apparatus according to claim 1, wherein: The pressing jig is configured to include a driving mechanism and an outer mold that is radially driven by the driving mechanism and contacts the inner peripheral surface of the stator. 4. The compressor manufacturing apparatus according to claim 1, wherein: The pressing jig includes a wedge-shaped pull-out rod and an outer die forming a tapered hollow portion into which the pull-out rod is inserted, and the outer die is in contact with the inner peripheral surface of the stator. 5. The compressor manufacturing apparatus according to any one of claims 1 to 4, wherein: The pressing jig forms the two protrusions in a state where the container is heated, The two protrusions are heat-shrinked by the container to be sandwiched between the two recesses of the stator, The compressor manufacturing apparatus further includes another pressing jig that exerts a radial force on the outer peripheral surface of the container from the outside of the container, thereby suppressing thermal contraction of the two protrusions. Deformation of the outer peripheral surface of the container. 6. The compressor manufacturing apparatus according to claim 5, wherein: The other pressing jig acts a radial force between an end closer to the stator than the compression mechanism and the stator at both ends in the axial direction of the container. 7. A compressor manufacturing method for manufacturing a compressor as follows, The compressor includes: an electric motor having a stator, and two recesses arranged in a circumferential direction on the outer peripheral surface of the stator; a compression mechanism driven by the electric motor; and a container for accommodating the stator and the stator. the compression mechanism, The manufacturing method of the compressor is characterized in that, A radial force is applied to the outer peripheral surface of the container from the outside of the container by using a pressing jig, thereby forming two convex portions arranged in the circumferential direction on the inner peripheral surface of the container, and making the two convex portions part into the two recesses, A radial force is applied to the inner peripheral surface of the stator from the inner side of the stator by the pressing jig, thereby suppressing deformation of the inner peripheral surface of the stator due to the force from the pressing jig.