JP6290065B2 - Compressor manufacturing apparatus and compressor manufacturing method - Google Patents

Description

  The present invention relates to a compressor manufacturing apparatus and a compressor manufacturing method. The present invention relates to a manufacturing apparatus and a manufacturing method for a hermetic electric compressor used in a refrigeration cycle apparatus such as an air conditioner or a refrigerator.

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

  There is also a method of fixing the stator to the hermetic container without performing shrink fitting (for example, see Patent Document 2). In this method, a plurality of pilot holes adjacent to each other are provided on the outer peripheral surface of the stator. After locally heating the locations facing the plurality of prepared holes in the sealed container, a pressing jig is pressed inward in the radial direction to the locations, and a convex portion that engages with the prepared holes is formed in the sealed container. The stator is fixed to the hermetic container by tightening the space between the pilot holes of the hermetic container with the convex portion of the hermetic container by heat shrinkage due to cooling of the hermetic container.

JP 60-159391 A JP 2007-303379 A

  In the method of fixing the stator of the electric motor to the sealed container by shrink fitting, it is difficult to control the tightening force acting on the stator. In particular, the stator formed by laminating electromagnetic steel sheets has low rigidity, and the inner diameter roundness of the stator deteriorates, so that the air gap between the stator and the rotor becomes non-uniform, and the compressor Magnetic unbalanced sound is generated during operation. In addition, due to variations in temperature distribution when heating the sealed container and release of processing strain caused by heating of the components, stress concentrates on a specific portion of the stator core, resulting in iron loss and lowering the motor efficiency.

  Even in the method of fixing the stator to the sealed container by arc spot welding or laser welding, the tensile force due to thermal contraction acts on the stator during welding, so that the roundness of the inner diameter of the stator deteriorates, so that the operation of the compressor Magnetic unbalanced sound is generated inside. In addition, foreign matter enters the sealed container during welding.

  In the method of fixing the stator to the sealed container without shrink fitting, the pressing jig is pressed inward in the radial direction against the sealed container, so that the convex portions of the sealed container are formed in a plurality of pilot holes on the outer peripheral surface of the stator. However, the inner peripheral surface of the stator may be deformed at this time, and the roundness of the inner diameter of the stator may be deteriorated.

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

A compressor manufacturing apparatus according to an aspect of the present invention includes:
An electric motor having a stator and having two concave portions formed along the circumferential direction on the outer peripheral surface of the stator, a compression mechanism driven by the electric motor, and the stator and the compression mechanism are accommodated A compressor including a container is manufactured.
The compressor manufacturing apparatus includes:
By applying a radial force to the outer peripheral surface of the container from the outside of the container, two convex portions arranged along the circumferential direction are formed on the inner peripheral surface of the container, and the two convex portions are A pressing jig that enters two recesses,
A pressing jig that suppresses deformation of the inner peripheral surface of the stator due to a force from the pressing jig by applying a radial force to the inner peripheral surface of the stator from the inside of the stator. .

  In the present invention, the pressing jig of the compressor manufacturing apparatus applies a radial force from the inside of the stator to the inner peripheral surface of the stator, so that the inner peripheral surface of the stator by the force from the pressing jig is applied. Suppress deformation. For this reason, according to this invention, the internal diameter roundness of a stator improves.

1 is a circuit diagram of a refrigeration cycle apparatus according to Embodiment 1. FIG. 1 is a circuit diagram of a refrigeration cycle apparatus according to Embodiment 1. FIG. 1 is a longitudinal sectional view of a compressor according to Embodiment 1. FIG. AA sectional drawing of FIG. FIG. 3 is a perspective view of a stator core of the stator of the electric motor according to Embodiment 1. FIG. 4 is a plan view of a stator core of the stator of the electric motor according to Embodiment 1. FIG. 3 is a partial perspective view of the sealed container according to the first embodiment. FIG. 3 is a cross-sectional view of the sealed container according to Embodiment 1. FIG. 3 is a plan view of a split core of the stator of the electric motor according to Embodiment 1. FIG. 2 is a plan view of the compressor manufacturing apparatus and the compressor according to the first embodiment. 1 is a longitudinal sectional view of a compressor manufacturing apparatus and a compressor according to Embodiment 1. FIG. FIG. 3 is a partial cross-sectional view of the stator and the airtight container of the electric motor according to Embodiment 1. FIG. 3 is a partial cross-sectional view of the stator and the airtight container of the electric motor according to Embodiment 1. FIG. 3 is a partial cross-sectional view of the stator and the airtight container of the electric motor according to Embodiment 1. E arrow line view of FIG. FIG. 3 is a plan view of a holding jig and a stator of the electric motor of the compressor manufacturing apparatus according to the first embodiment. The longitudinal cross-sectional view of the compressor manufacturing apparatus which concerns on Embodiment 2, and a compressor. FIG. 5 is a longitudinal sectional view of a compressor manufacturing apparatus and a compressor according to a third embodiment. The top view of the compressor manufacturing apparatus and compressor which concern on Embodiment 4. FIG. FIG. 6 is a longitudinal sectional view of a compressor manufacturing apparatus and a compressor according to a fourth embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the part which is the same or it corresponds in each figure. In the description of the embodiments, the description of the same or corresponding parts will be omitted or simplified as appropriate. In the description of the embodiment, the arrangement, orientation, etc., such as “top”, “bottom”, “left”, “right”, “front”, “back”, “front”, “back”, etc., are for convenience of explanation. It is only described as such, and does not limit the arrangement or orientation of devices, instruments, parts, and the like. About the structure of an apparatus, an instrument, components, etc., the material, shape, size, etc. can be suitably changed within the scope of the present invention.

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

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

  As shown in FIGS. 1 and 2, the refrigeration cycle apparatus 10 includes refrigerant circuits 11a and 11b in which a 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 11a and 11b. The compressor 12 compresses the refrigerant. The four-way valve 13 switches the direction in which the refrigerant flows between the cooling operation and the heating operation. The outdoor heat exchanger 14 is an example of a first heat exchanger. The outdoor heat exchanger 14 operates as a condenser during the cooling operation, and dissipates the refrigerant compressed by the compressor 12. The outdoor heat exchanger 14 operates as an evaporator during heating operation, 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. The indoor heat exchanger 16 operates as a condenser during the heating operation, and dissipates the refrigerant compressed by the compressor 12. The indoor heat exchanger 16 operates as an evaporator during the cooling operation, and heats the refrigerant by exchanging heat between the indoor air and the refrigerant expanded by the expansion valve 15.

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

  The control device 17 is, for example, a microcomputer. 1 and 2 show only the connection between the control device 17 and the compressor 12, the control device 17 is connected not only to the compressor 12 but also to each element connected to the refrigerant circuits 11a and 11b. . The control device 17 monitors and controls the state of each element.

  As the refrigerant circulating in the refrigerant circuits 11a and 11b, any refrigerant such as R407C refrigerant, R410A refrigerant, R1234yf refrigerant, or the like can be used.

  FIG. 3 is a longitudinal sectional view of the compressor 12. 4 is a cross-sectional view taken along line AA in FIG. In FIGS. 3 and 4, hatching representing a cross section is omitted. In FIG. 4, only the inside of the sealed container 20 is shown.

  In the present embodiment, the compressor 12 is a one-cylinder rotary compressor. Note that the present embodiment can be applied even when the compressor 12 is a multi-cylinder rotary compressor or a scroll compressor.

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

  The sealed container 20 is an example of a container. A suction pipe 21 for sucking the refrigerant and a discharge pipe 22 for discharging the refrigerant are attached to the sealed container 20. The sealed container 20 includes a container main body 26 having one end in the height direction opened, and a container lid 27 attached to the container main body 26 so as to close the one open end of the container main body 26.

  The compression mechanism 30 is housed inside the sealed container 20. Specifically, the compression mechanism 30 is installed in the lower part inside the sealed container 20. The compression mechanism 30 is driven by the electric motor 40. The compression mechanism 30 compresses the refrigerant sucked into the suction pipe 21.

  The electric motor 40 is also housed inside the sealed container 20. Specifically, the electric motor 40 is installed inside the sealed 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 electric motor 40 is installed above the compression mechanism 30 inside the sealed container 20. The electric motor 40 is a concentrated winding motor. The present embodiment can be applied even if the electric motor 40 is a distributed winding motor.

  Refrigerating machine oil 25 for lubricating the sliding portions of the compression mechanism 30 is stored at the bottom of the sealed container 20. As the crankshaft 50 rotates, the refrigerating machine oil 25 is pumped up by an oil pump provided at the lower portion of the crankshaft 50 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), and AB (alkylbenzene) which are synthetic oils are used.

  Below, the detail of the compression mechanism 30 is demonstrated.

  As shown in FIGS. 3 and 4, the compression mechanism 30 includes a cylinder 31, a rolling 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 that is a substantially circular space in plan view is formed inside the cylinder 31. The cylinder 31 is open at both axial ends.

  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, 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 through which gas refrigerant is sucked from the refrigerant circuits 11a and 11b. The suction port passes through the cylinder chamber 62 from the outer peripheral surface of the cylinder 31.

  Although not shown, the cylinder 31 is provided with a discharge port through which the compressed refrigerant is discharged from the cylinder chamber 62. The discharge port is formed by cutting out the upper end surface of the cylinder 31.

  The rolling piston 32 has a ring shape. The rolling piston 32 moves eccentrically in the cylinder chamber 62. The rolling piston 32 is slidably fitted to the eccentric shaft portion 51 of the crankshaft 50.

  The shape of the vane 36 is a flat, substantially rectangular parallelepiped. The vane 36 is installed in the vane groove 61 of the cylinder 31. The vane 36 is always pressed against the rolling piston 32 by a vane spring 37 provided in the back pressure chamber 63. Since the inside of the sealed container 20 is at a high pressure, when the operation of the compressor 12 starts, the difference between the pressure in the sealed container 20 and the pressure in the cylinder chamber 62 on the back surface of the vane that is the surface on the back pressure chamber 63 side of the vane 36. The force by acts. For this reason, the vane spring 37 is mainly used for the purpose of pressing the vane 36 against the rolling piston 32 at the time of starting the compressor 12 where there is no difference in the pressure in the sealed container 20 and the cylinder chamber 62.

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

  The auxiliary bearing 34 is substantially T-shaped in a side view. The auxiliary bearing 34 is slidably fitted to the auxiliary shaft portion 53 that is a portion below the eccentric shaft portion 51 of the crankshaft 50. The auxiliary bearing 34 closes the cylinder chamber 62 and the lower side of the vane groove 61 of the cylinder 31.

  Although not shown, the main bearing 33 includes a discharge valve. A discharge muffler 35 is attached to the outside of the main bearing 33. The high-temperature and high-pressure gas refrigerant discharged through the discharge valve once enters the discharge muffler 35 and is then discharged from the discharge muffler 35 into the space in the sealed container 20. Note that the discharge valve and the discharge muffler 35 may be provided in the auxiliary bearing 34 or in both the main bearing 33 and the main bearing 33.

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

  A suction muffler 23 is provided beside the sealed container 20. The suction muffler 23 sucks low-pressure gas refrigerant from the refrigerant circuits 11a and 11b. The suction muffler 23 prevents the liquid refrigerant from directly entering the cylinder chamber 62 of the cylinder 31 when the liquid refrigerant returns. 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 sealed container 20 by welding or the like.

  Below, the detail of the electric motor 40 is demonstrated.

  In the present embodiment, the electric motor 40 is a brushless DC (Direct Current) motor. Note that the present embodiment can be applied even if the motor 40 is a motor other than a brushless DC motor, such as an induction motor.

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

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

  The stator 41 includes a stator core 43 and a winding 44. The stator core 43 is formed by punching a plurality of electromagnetic steel sheets having a thickness of 0.1 to 1.5 mm, each having a thickness of 0.1 to 1.5 mm, laminated in the axial direction, and fixed by caulking or welding. Produced. The winding 44 is wound around the stator core 43 in a concentrated manner through an insulating member 47. The winding 44 is composed of a core wire and at least one layer of a coating covering the core wire. The material of the core wire is, for example, copper. The material of the film is, for example, AI (amidoimide) / 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 / perfluoroalkyl vinyl ether copolymer). PTFE (polytetrafluoroethylene), LCP (liquid crystal polymer), PPS (polyphenylene sulfide), and phenol resin. A lead wire 45 is connected to the winding 44.

  The rotor 42 includes a rotor core 46 and a permanent magnet (not shown). As with the stator core 43, the rotor core 46 is formed by punching a plurality of electrical steel sheets having a thickness of 0.1 to 1.5 mm and having a thickness of 0.1 to 1.5 mm, and laminating them in the axial direction. It is manufactured by fixing by caulking or welding. The permanent magnet is inserted into a plurality of insertion holes formed in the rotor core 46. The permanent magnet forms a magnetic pole. For example, a ferrite magnet or a rare earth magnet is used as the permanent magnet.

  In order to prevent the permanent magnet from coming off in the axial direction, an upper end plate 48 and a lower end plate 49 are provided at the upper end and lower end of the rotor, which are the axial ends of the rotor 42, respectively. The upper end plate 48 and the lower end plate 49 also serve as a rotation 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 or the like not shown.

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

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

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

  A discharge pipe 22 having both axial ends open is attached to the top of the sealed container 20. The gas refrigerant discharged from the compression mechanism 30 is discharged from the space in the sealed container 20 through the discharge pipe 22 to the external refrigerant circuits 11a and 11b.

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

  Below, operation | movement of the compressor 12 is demonstrated.

  Electric power is supplied from the terminal 24 to the stator 41 of the electric motor 40 via the lead wire 45. As a result, a current flows through the winding 44 of the stator 41 and a magnetic flux is generated from the winding 44. The rotor 42 of the electric motor 40 rotates by the action of the magnetic flux generated from the winding 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 rolling piston 32 of the compression mechanism 30 rotates eccentrically in the cylinder chamber 62 of the cylinder 31 of the compression mechanism 30. A space between the cylinder 31 and the rolling piston 32 is divided into two by a vane 36 of the compression mechanism 30. As the crankshaft 50 rotates, the volumes of these two spaces change. In one space, the volume gradually increases, whereby low-pressure gas refrigerant is sucked from the suction muffler 23. In the other space, the volume of the gas refrigerant is gradually reduced to compress the gas refrigerant therein. The compressed, high-pressure and high-temperature gas refrigerant is discharged from the discharge muffler 35 into the space in the sealed container 20. The discharged gas refrigerant further passes through the electric motor 40 and is discharged out of the sealed container 20 from the discharge pipe 22 at the top of the sealed container 20. The refrigerant discharged to the outside of the sealed 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 vane 36 is provided integrally with the rolling piston 32. When the crankshaft 50 is driven, the vane 36 moves in and out along the receiving groove of the support body that is rotatably attached to the rolling piston 32. The vane 36 moves in the radial direction while swinging according to the rotation of the rolling piston 32, thereby dividing the inside of the cylinder chamber 62 into a compression chamber and a suction chamber. The support is composed of two columnar members having 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.

  Below, the structure of the stator core 43 of the stator 41 of the electric motor 40 and the airtight container 20 is demonstrated in order.

  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 the present embodiment, two concave portions 72 arranged along the circumferential direction are formed at a plurality of locations in the circumferential direction of the outer peripheral surface 71 of the stator core 43. A notch 73 is formed between the two recesses 72. 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 along the axial direction.

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

  The stator core 43 is configured by connecting a plurality of divided cores 74 in the circumferential direction. That is, in the present embodiment, the stator 41 of the electric motor 40 has a plurality of divided iron cores 74 that are connected in the circumferential direction and constitute the stator iron core 43. A tooth 75 is formed on each divided iron core 74. The teeth 75 have a shape that extends inward in the radial direction with a certain width from the root, and has a shape in which the width is widened at the tip. A winding 44 is wound around a portion of the tooth 75 extending at a certain width. When a current is passed through the winding 44, the teeth 75 around which the winding 44 is wound become a magnetic pole. The direction of the magnetic pole is determined by the direction of the current flowing through the winding 44.

  5 and 6 show, as an example, the stator core 43 in which two concave portions 72 and notches 73 are formed at nine locations in the circumferential direction of the outer peripheral surface 71. The number of locations where the notches 73 are formed can be changed as appropriate. In order to securely fix the stator 41 of the electric motor 40 to the inside of the sealed container 20, it is desirable that two concave portions 72 and notches 73 are formed at three or more locations in the circumferential direction of the outer peripheral surface 71.

  Further, as an example, a configuration in which one notch 73 is formed between the two recesses 72 with respect to the two recesses 72 is shown. You may employ | adopt the structure in which the notch 73 is formed.

  Further, as an example, the stator core 43 in which nine teeth 75 are formed is shown, but the number of teeth 75 can be changed as appropriate.

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

  In addition, as an example, a configuration in which two recesses 72 and notches 73 are formed in all the teeth 75 or in all the divided iron cores 74 is shown. Two concave portions 72 and notches 73 may be formed only in the divided iron core 74 of the portion. In addition, when the two recessed parts 72 and the notch 73 are formed in all the division | segmentation iron cores 74, compared with the case where the two recessed parts 72 and the notch 73 are formed only in some division | segmentation iron cores 74, Costs can be reduced by unifying the shape of the split core 74.

  Further, as an example, the configuration in which each concave portion 72 extends in a groove shape over the entire axial direction is shown, but the configuration in which each concave portion 72 extends only in a part in the axial direction, that is, each concave portion 72 has You may employ | adopt the structure formed as a hole. When each concave portion 72 extends in a groove shape over the entire axial direction, compared to the case where each concave portion 72 is formed as a hole, cost reduction by unifying the shape of laminated electromagnetic steel sheets, or The risk of incorrect assembly of electrical steel sheets can be avoided.

  As shown in FIG. 5 and FIG. 6, the recess 72 is provided as a set of two adjacent states. Hereinafter, a partial region of the outer peripheral surface 71 of the stator core 43, which is a combination of the two concave portions 72 and the portion sandwiched between the two concave portions 72, is referred to as a fixed portion 76. In the present embodiment, nine fixing portions 76 are provided on the outer peripheral surface 71 of the stator core 43 at substantially equal intervals. Therefore, there are 18 recesses 72 in total. Of the 18 pieces, 6 pieces are used to fix the stator 41 of the electric motor 40 inside the sealed container 20.

  FIG. 7 is a partial perspective view of the sealed container 20. FIG. 8 is a cross-sectional view of the sealed container 20. FIG. 7 shows only a part of the sealed container 20 in the axial direction. The axial direction of the sealed container 20 is the height direction of the sealed container 20. The axial direction of the sealed container 20 is parallel to the axial direction of the stator 41 of the electric motor 40.

  As shown in FIGS. 7 and 8, in the present embodiment, two convex portions 82 arranged in the circumferential direction are formed at a plurality of locations in the circumferential direction of the inner circumferential surface 81 of the sealed container 20. The two convex portions 82 enter the two concave portions 72 shown in FIGS. 5 and 6 and sandwich the portion where the notch 73 of the stator 41 of the electric motor 40 is formed, so that the electric motor 40 is placed inside the sealed container 20. The stator 41 is fixed.

  On the outer peripheral surface 83 of the sealed container 20, at positions corresponding to the respective convex portions 82, there are processed holes 84 formed by pressing the outer peripheral surface 83 in order to form the respective convex portions 82 on the inner peripheral surface 81. is there.

  7 and 8 show the sealed container 20 in which two convex portions 82 are formed at three locations in the circumferential direction of the inner peripheral surface 81 as an example. Can be appropriately changed. In order to securely fix the stator 41 of the electric motor 40 to the inside of the sealed container 20, it is desirable that two convex portions 82 are formed at three or more locations in the circumferential direction of the inner peripheral surface 81.

  As shown in FIGS. 7 and 8, the convex portion 82 is provided as a pair of two adjacent states. As will be described later, the convex portion 82 is used to seal the stator 41 of the electric motor 40 with an airtight container. It is formed by pushing the outer peripheral surface 83 of the sealed container 20 into the sealed container 20 in a state of being installed inside the sealed container 20. The two convex portions 82 forming the set enter the two concave portions 72 forming the set to form two caulking points. Below, the partial area | region of the inner peripheral surface 81 of the airtight container 20 which match | combined the two convex parts 82 which form these caulking points shall be called the caulking part 85. FIG. In the present embodiment, three caulking portions 85 are provided on the inner peripheral surface 81 and the outer peripheral surface 83 of the sealed container 20 at substantially equal intervals. Therefore, there are six convex portions 82 in total.

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

  As described above, in the present embodiment, the two convex portions 82 enter the two concave portions 72 at a plurality of locations corresponding to each other of the stator 41 and the sealed container 20 of the electric motor 40, so that the stator 41 of the electric motor 40 is cut. The stator 41 of the electric motor 40 is fixed inside the sealed container 20 by sandwiching the portion where the notch 73 is formed. When the notch 73 is not present, the portion between the two concave portions 72 is tightened by the two convex portions 82, so that the portion B shown in FIG. 9, that is, the radially inner end portion of the seam of the split iron core 74 is formed. Stress is concentrated. Since the portion B is originally a position where the magnetic flux from the magnetic pole formed in the tooth 75 flows, a hysteresis loss occurs when stress concentrates on this portion. Hysteresis loss means that the magnetic resistance at a location where stress is concentrated increases, so that the magnetic flux hardly flows at that location and loss occurs. Hysteresis loss is so-called iron loss, which causes a reduction in motor efficiency. On the other hand, in the present 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 location C is away from the flow path of the magnetic flux from the magnetic pole, hysteresis loss is unlikely to occur even if stress concentrates on this location. Moreover, if stress concentrates on the location C, the stress applied on the location B can be significantly reduced. Therefore, generation | occurrence | production of an iron loss can be avoided and the fall of motor efficiency can be suppressed.

  Further, as shown in FIG. 9, in the present embodiment, the split iron core 74 is formed in a region between the notch 73 of the outer peripheral surface 71 of the split iron core 74 constituting the stator core 43 and each of the two recesses 72. A protruding portion 77 that protrudes outward in the radial direction from the other region of the outer peripheral surface 71 is formed. When the inner peripheral surface 81 of the sealed container 20 comes into contact with the protruding portion 77, the stator 41 of the electric motor 40 can be more reliably fixed to the inside of the sealed container 20. 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 sealed container 20, the projecting portion 77 is in contact with the inner peripheral surface 81 of the sealed container 20. The degree is improved. In other words, in the present embodiment, the two convex portions 82 formed on the sealed container 20 sandwich the portion where the notch 73 of the stator 41 is formed, so that the tightening acting on the stator 41 from the sealed container 20 is performed. Even if the force is low, the stator 41 can be fixed inside the sealed container 20. Therefore, the inner peripheral surface 81 of the hermetic container 20 and the outer peripheral surface 71 of the stator 41 are brought into contact with each other, and the contact area is reduced, so that the stator 41 is reliably fixed and the inner diameter roundness of the stator 41 is increased. It is possible to achieve both improvement. By limiting the region of the outer peripheral surface 71 of the stator 41 that contacts the inner peripheral surface 81 of the sealed container 20 to the protruding portion 77, the contact area can be reduced.

  In the present embodiment, the region between the notch 73 of the outer peripheral surface 71 of the split iron core 74 constituting the stator core 43 and each of the two recesses 72 is connected to the notch 73 and the protrusion 77 is not formed. It is divided into a contact area 78 and a contact area 79 connected to one of the two recesses 72 and formed with a protrusion 77. The positional relationship between the non-contact region 78 and the contact region 79 may be reversed. However, when the non-contact region 78 is on the concave portion 72 side, the convex portion 82 does not enter the concave portion 72 to the root. Therefore, in order to increase the tightening force by the convex portion 82, it is desirable to provide the contact region 79 on the concave portion 72 side. The area ratio between the non-contact region 78 and the contact region 79 can be arbitrarily set.

  In the present embodiment, the stator 41 of the electric motor 40 is fitted inside the sealed container 20 by shrink fitting so that the inner peripheral surface 81 of the sealed container 20 contacts the protruding portion 77. Here, shrink fitting refers to a state in which the closed container 20 having an inner diameter smaller than the outer diameter of the stator 41 is heated and thermally expanded, and the stator 41 is fitted into the closed container 20, and then the closed container 20 is heated. This is a technique for fixing the stator 41 to the sealed container 20 by utilizing contraction. When the stator 41 of the electric motor 40 is fixed to the inside of the hermetic container 20 only by shrink fitting, the air gap between the stator 41 and the rotor 42 is reduced due to the deterioration of the roundness of the inner diameter of the stator core 43. May become non-uniform and a magnetic unbalanced sound may be caused. However, in the present embodiment, the two convex portions 82 enter the two concave portions 72 and the notches 73 of the stator 41 of the electric motor 40 are formed at a plurality of locations corresponding to each other of the stator 41 and the sealed container 20 of the electric motor 40. Since the formed portion is sandwiched, the degree of fixing by shrink fitting can be reduced. That is, on the outer peripheral surface 71 of the stator core 43, the tightening portion by shrink fitting can be held only in the contact region 79. Even if the non-contact region 78 is not provided and the entire region between the cutout 73 of the outer peripheral surface 71 of the split iron core 74 and each of the two recesses 72 is in contact with the inner peripheral surface 81 of the sealed container 20, The area of the tightening portion by shrink fitting can be reduced as compared with the configuration in which the stator 41 of the electric motor 40 is fixed inside the sealed container 20 only by shrink fitting. Therefore, the inner diameter roundness of the stator core 43 can be improved, and generation of magnetic unbalanced sound can be suppressed. Note that the stator 41 of the electric motor 40 may be fitted inside the sealed container 20 by cold fitting.

  In the present embodiment, the two concave portions 72 are arranged separately on both sides of the central position in the circumferential direction of each of the plurality of divided iron cores 74. In FIG. 9, a center line indicating the center position of the divided iron core 74 in the circumferential direction is represented by a one-dot chain line D.

  Note that the two recesses 72 of the stator 41 of the electric motor 40 may not have the notches 73. Regardless of the presence or absence of the notch 73, the two convex portions 82 enter the two concave portions 72 at a plurality of locations corresponding to each other of the stator 41 and the hermetic container 20 of the electric motor 40, and between the two concave portions 72 of the stator 41. The stator 41 of the electric motor 40 is fixed inside the sealed container 20 by sandwiching this part.

  Below, the structure of the apparatus which manufactures the compressor 12, the method of manufacturing the compressor 12, the said apparatus, and the effect acquired by the said method are demonstrated in order.

*** Explanation of configuration ***
FIG. 10 is a plan view of the compressor manufacturing apparatus 90 and the compressor 12 according to the present embodiment, which is an apparatus for manufacturing the compressor 12. FIG. 11 is a longitudinal sectional view of the compressor manufacturing apparatus 90 and the compressor 12. 10 and 11 show the compressor 12 being manufactured in a simplified manner.

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

  The pressing jig 91 applies a radial force F to the outer peripheral surface 83 of the sealed container 20 from the outside of the sealed container 20, and as will be described later, along the circumferential direction on the inner peripheral surface 81 of the sealed container 20. The two convex portions 82 are formed so that the two convex portions 82 enter the two concave portions 72. At this time, the closed container 20 is not attached with the container lid 27 and is in a state of only the container main body 26. The pressing jig 95 applies a radial force G to the inner peripheral surface 70 of the stator 41 from the inside of the stator 41, so that the stator 41 is pressed by the force F from the pressing jig 91 as described later. The deformation of the inner peripheral surface 70 is suppressed.

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

  The holding jig 95 includes a drive mechanism 96 and an outer mold 97 that is driven in the radial direction by the drive mechanism 96 and contacts the inner peripheral surface 70 of the stator 41. The aforementioned radial force G is the pressing force of the outer mold 97 against the inner peripheral surface 70 of the stator 41. This pressing force increases as the outer mold 97 is driven radially outward by the driving mechanism 96, and decreases as the outer mold 97 is driven radially inward by the driving mechanism 96. Therefore, the radial force G can be appropriately adjusted by the drive mechanism 96.

  As the drive mechanism 96, any mechanism can be adopted as long as the outer mold 97 can be driven in the radial direction. For example, a mechanism for driving the outer die 97 in the radial direction by hydraulic pressure or air pressure may be employed, or a mechanism such as that of the second or third embodiment described later may be employed.

*** Explanation of method ***
The steps provided in the compressor manufacturing method according to the present embodiment, which is a method for manufacturing the compressor 12, include the following.
Storage step: The compression mechanism 30 is stored in the closed container 20. The sealed container 20 is in a state of only the container body 26 without the container lid 27 attached.
Installation process: a process of installing the stator 41 of the electric motor 40 inside the sealed container 20.
Processing step: a step of heating a plurality of locations in the circumferential direction of the inner peripheral surface 81 of the sealed container 20 and processing the heated plurality of locations to form two convex portions 82 that enter the two concave portions 72. In this step, a radial force F is applied to the outer peripheral surface 83 of the sealed container 20 from the outside of the sealed container 20 by the pressing jig 91, so that the inner peripheral surface 81 of the sealed container 20 is aligned along the circumferential direction. Two convex portions 82 are formed, and these two convex portions 82 are allowed to enter the two concave portions 72. At the same time, by applying a radial force G to the inner peripheral surface 70 of the stator 41 from the inside of the stator 41 by the pressing jig 95, the inner peripheral surface 70 of the stator 41 by the force F from the pressing jig 91. Suppresses deformation.
Fixing step: The two convex portions 82 are thermally contracted, and the portions where the notches 73 of the stator 41 of the electric motor 40 are formed by the two convex portions 82 are sandwiched between the stator 41 of the electric motor 40 and the sealed container. 20 is a step of fixing the inside.
Closure step: a step of closing the opened end of the container body 26 with the container lid 27.

  The above five steps are performed in the order of a storing step, an installation step, a processing step, a fixing step, and a closing step.

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

  12, 13, and 14 are partial cross-sectional views of the stator 41 and the hermetic container 20 of the electric motor 40 in each step for fixing the stator 41 of the electric motor 40 to the inside of the hermetic container 20. 12, 13, and 14 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 body 26 of the sealed container 20.

  In the processing step, as shown in FIG. 12, a certain range around the position corresponding to the center position between the two concave portions 72 of each fixing portion 76 on the outer peripheral surface 83 of the sealed container 20 is a sealed container 20. The part which opposes each fixing | fixed part 76 in is heated locally from the outer side of the airtight container 20. FIG. After the sealed container 20 is thermally expanded by heating, the pressing jig 91 is pressed straight from the outside of the sealed container 20 toward the two recesses 72 as shown in FIG. Specifically, the two tip portions 92 of the pressing jig 91 having a width slightly smaller than the width of the concave portion 72 and having an end surface that is a rectangular flat surface are pressed toward the two concave portions 72 simultaneously. As a result, as shown in FIG. 14, a processed hole 84 having the same width as the distal end portion 92 of the pressing jig 91 is formed in the outer peripheral surface 83 of the sealed container 20. Two convex portions 82 that enter the two concave portions 72 are formed on the inner peripheral surface 81 of the sealed 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 pressing jigs 91 are used to form three caulking portions 85. The three caulking portions 85 are formed by pressing the three pressing jigs 91 almost simultaneously onto the three locations on the outer peripheral surface 71 of the stator core 43.

  In the fixing step, as shown in FIG. 14, the thermally expanded sealed container 20 is cooled. When the sealed container 20 is cooled, the two convex portions 82 are drawn toward the center of the heated range by heat shrinkage. Therefore, the two concave portions 72 adjacent to the fixing portion 76 are tightened in the circumferential direction by the two convex portions 82. Thereby, the stator 41 of the electric motor 40 including the stator core 43 is fixed to the sealed container 20. The stator 41 of the electric motor 40 is not fixed by the force in the radial direction as in the conventional fixing method by shrink fitting, but the stator 41 of the electric motor 40 is fixed by the force in the circumferential direction. The strain applied to the iron core 43 can be reduced. Further, unlike the conventional fixing method by arc spot welding and laser welding, since the hermetic container 20 is not perforated, there is no possibility that foreign matter is mixed in or the refrigerant leaks.

  FIG. 15 is a view taken in the direction of arrow E in FIG. That is, FIG. 15 is a view of the outer peripheral surface 83 of the sealed container 20 as viewed from the direction E shown in FIG.

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

  In the processing step, when the pressing amount H (see FIG. 14) of the pressing jig 91 is increased, the thickness K (see FIG. 14) of the minimum thickness portion of the sealed container 20 is decreased. Here, the thickness K of the minimum thickness portion is a distance between the root of the convex portion 82 formed in the sealed container 20 and the processing hole 84. As the depth J of the processing hole 84 increases (see FIG. 14), the push-in amount H increases. The depth J of the processed hole 84 is basically equal to the protruding length of the convex portion 82 from the inner peripheral surface 81. The thickness K of the minimum thickness portion is determined by the depth J of the processed hole 84. In order to secure the push-in amount H, the processed hole 84 is always formed, and the thickness K of the minimum thickness portion is substantially smaller than the plate thickness of the sealed container 20 by the depth J of the processed hole 84. When the depth J of the processing hole 84 is increased in order to increase the pushing amount H, the thickness K of the minimum thickness portion of the sealed container 20 becomes thin, and when the internal pressure acts on the sealed container 20, There is a possibility that the refrigerant leaks from the minimum thickness portion. Therefore, the maximum allowable value of the depth J of the processed hole 84 is determined within a range in which the pressure resistance required for the sealed container 20 can be satisfied. If the thickness K of the minimum thickness portion is 0.5 times or more the plate thickness of the sealed container 20, the pressure resistance strength of the sealed container 20 can usually be sufficiently satisfied. For example, if the plate thickness of the sealed container 20 is 2.6 mm, the depth J of the processed hole 84 may be set to 1.3 mm or less. Therefore, the pushing amount H is also 0.5 times or less the plate thickness of the sealed container 20.

  In the present embodiment, the fixing portions 76 are formed at three locations on the outer peripheral surface 71 of the stator 41, but it is desirable that the arrangement of the three locations be an equal pitch of 120 °. As shown in FIG. 13, in the processing step, the tip 92 of the pressing jig 91 directly contacts the sealed container 20 and plastically deforms the sealed container 20. Thereby, the caulking part 85 is formed in three places. Since two caulking points are formed at one place, the total number of caulking points is 6. One pressing jig 91 is used for one caulking portion 85. That is, a total of three pressing jigs 91 are installed. As shown in FIG. 10, the force F applied from the pressing jig 91 to the sealed container 20 acts toward the center of the sealed container 20. The magnitudes of the three forces F are equal.

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

  Since the stator 41 formed by the lamination of electromagnetic steel plates has low rigidity, the inner peripheral surface 70 of the stator 41 is pressed when the front end portion 92 of the pressing jig 91 is pressed against the outer peripheral surface 83 of the sealed container 20 in the radial direction. There is a risk that the inner diameter roundness of the stator 41 may deteriorate due to deformation. As a countermeasure, in the present embodiment, as shown in FIG. 16, a force G is applied to the inner peripheral surface 70 of the stator 41 in the radial direction to suppress deformation of the inner peripheral surface 70 of the stator 41. A holding jig 95 is used.

  The holding jig 95 has an outer mold 97 that is driven in the radial direction of the stator 41 by the driving mechanism 96 and applies a force G. At least a part of the outer mold 97 is divided into the same number as the number of teeth 75 formed in the stator core 43. The outer peripheral shape of the divided part of the outer die 97 is in the same circular arc shape as the inner peripheral shape of the teeth 75 in order to contact the inner peripheral surface 70 of the stator 41. The divided portions of the outer die 97 of the pressing jig 95 press the opposing teeth 75 with a force G that is appropriately set. Note that only a part of the divided portion of the outer die 97 of the pressing jig 95 may be in contact with the tooth 75, and the rest may not be in contact with the tooth 75. That is, there may be a portion where G = 0.

*** Explanation of effects ***
Hereinafter, the effect which this Embodiment has is demonstrated.

  In the present embodiment, the pressing jig 95 of the compressor manufacturing apparatus 90 applies a radial force G from the inner side of the stator 41 to the inner peripheral surface 70 of the stator 41, thereby The deformation of the inner peripheral surface 70 of the stator 41 due to the force F is suppressed. For this reason, according to this Embodiment, the internal diameter roundness of the stator 41 improves.

  In the present embodiment, two convex portions 82 that enter the two concave portions 72 provided on the outer peripheral surface 71 of the stator 41 are formed, and the portion between the two concave portions 72 is sandwiched and fixed by the two convex portions. For this reason, according to this Embodiment, the arc spot welding or laser welding which a foreign material generate | occur | produces can be made unnecessary, and the more reliable compressor 12 with few amounts of foreign materials can be manufactured. Further, since the holding force of the stator 41 can be sufficiently secured, it is possible to greatly reduce the contact area between the outer peripheral surface 71 of the stator 41 and the inner peripheral surface 81 of the sealed container 20 due to shrink fitting. Become. Therefore, the tightening force on the stator 41 by shrink fitting can be greatly reduced, and the compressor 12 with higher performance can be manufactured.

  In the present embodiment, when the two convex portions 82 that enter the two concave portions 72 provided on the outer peripheral surface 71 of the stator 41 are formed, a force G is applied from the inside of the stator 41 to cause the stator 41 to move. The deterioration of the inner diameter roundness can be reduced. For this reason, according to the present embodiment, it is possible to manufacture a more reliable compressor 12 that is less likely to generate a magnetic unbalanced sound during operation.

  In the present embodiment, the two convex portions 82 formed in the sealed container 20 of the compressor 12 enter the two concave portions 72 formed in the stator 41 of the electric motor 40 of the compressor 12, and these two concave portions The stator 41 of the electric motor 40 is fixed to the inside of the sealed container 20 by sandwiching the portion in which the notch 73 between 72 is formed. The presence of the notch 73 relieves stress concentration that causes loss. In addition, a protruding portion 77 that protrudes outward in the radial direction from the other region of the outer peripheral surface 71 of the stator 41 in a region between the notch 73 of the outer peripheral surface 71 of the stator 41 and each of the two concave portions 72. 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 sealed container 20, the protrusion 77 is in contact with the inner peripheral surface 81 of the sealed container 20, so improves. Therefore, according to the present embodiment, it is possible to suppress a decrease in motor efficiency.

  According to the present embodiment, it is possible to obtain a hermetic electric compressor with high motor efficiency and low noise by minimizing the occurrence of iron loss and the deterioration of the roundness of the inner diameter of the stator 41 of the electric motor 40. it can. Even for long-term use, there is high reliability that does not cause problems such as noise and vibration increase due to rattling of the stator 41 of the electric motor 40, and iron loss due to stress concentration of the stator 41 is reduced. A hermetic electric compressor having excellent efficiency can be provided.

  According to the present embodiment, a sufficient pinching force is generated between the two concave portions 72 of the stator 41 of the electric motor 40 by the two convex portions 82 adjacent to the closed container 20, so that the electric motor is supplied to the closed container 20. Forty stators 41 can be firmly fixed. Even with long-term use of a hermetic electric compressor, it can withstand normal and excessive force generated during operation and does not cause problems such as increased noise and vibration due to rattling of the stator 41 of the electric motor 40. A highly reliable compressor 12 can be obtained. Moreover, 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, the performance is improved.

  The material of the sealed container 20 is generally iron. The yield point of iron suddenly decreases from around 600 ° C. The temperature at which the yield point starts to drop abruptly in this way is referred to herein as 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 hermetic container 20 and efficiently transform the hermetic container 20 into a certain shape, the heating temperature should be higher than the temperature at which the material softens and lower than the melting point. By reducing the yield point by heating, the spring back in the radial direction of the hermetic container 20 after the hermetic container 20 is plastically deformed to form the convex part 82, that is, the return of the convex part 82 is suppressed. In addition, it is possible to ensure a certain push-in amount H (see FIG. 14) efficiently and reliably. Here, the pushing amount H is the depth at which the convex portion 82 enters the concave portion 72. As described above, the material of the sealed container 20 is iron, and the softening temperature is 600 ° C. The melting point of iron is about 1560 ° C. Therefore, the heating temperature for local heating is preferably 600 ° C. or higher and 1500 ° C. or lower. Of course, if the material is other than iron, the heating temperature changes, and it is desirable that the temperature be higher than the softening temperature of the material and lower than the melting point.

  Since the heating range 93 includes all the processed holes 84 that serve as pressing portions of the pressing jig 91, the convex portion 82 can be reliably formed by using the characteristics of the material of the sealed container 20 at the high temperature as described above. Can do. Moreover, the pushing force for forming the convex portion 82 is reduced, and the distortion generated in the stator core 43 when the compressor 12 is assembled can be reduced. Furthermore, by setting the heating center 94 of the sealed container 20 so as to overlap the centers of the two recesses 72, after the two convex portions 82 are reliably formed in the sealed container 20, the heat shrinks toward the heating center 94. The two concave portions 72 can be firmly sandwiched between the two convex portions 82.

  Thus, the convex part 82 of the airtight container 20 is reliably formed, and the convex part 82 of the airtight container 20 is firmly sandwiched between the concave parts 72 of the stator 41 of the electric motor 40 to fix the stator 41 of the electric motor 40. For this reason, the stator 41 of the strong electric motor 40 that can withstand normal and excessive force generated during the operation of the compressor 12 and that does not generate rattling can be fixed for long-term use of the compressor 12. Is possible. Moreover, also when using shrink fitting together for fixation of the stator 41, the contact area by shrink fitting of the stator 41 and the airtight container 20 can be reduced significantly conventionally.

  For the axial direction of the compressor 12, the stator 41 of the electric motor 40 is supported by sandwiching the convex portion 82 of the hermetic container 20, and for the tangential direction, the stator 41 of the electric motor 40 is convex of the hermetic container 20. Not only support by sandwiching the portion 82 but also the rigidity of the convex portion 82 of the sealed container 20 is supported. What is necessary is just to select a fixed shape so that required fixed strength can be obtained according to the acceleration which generate | occur | produces in the fixing | fixed part 76. FIG. For example, the fixing strength can be increased by increasing the cross-sectional area of the convex portion 82 or increasing the number of the fixing portions 76. Further, the width of the concave portion 72 of the stator 41 can be selected so as to satisfy a pull-out strength specification for transportation, dropping, etc. of the compressor 12 in which axial acceleration occurs.

  Further, in the present embodiment, since a plurality of groove-shaped recesses 72 are formed at a plurality of locations of the stator core 43, the stator core 43 can be formed by stacking the same type of electrical steel sheets. Since there is no need to prepare a mold, it is possible to reduce costs and reduce the risk of assembly errors.

  In the present embodiment, in order to secure a higher fixing strength between the stator 41 and the sealed container 20, after the stator 41 and the sealed container 20 are shrink-fitted in the above-described installation process, the processing process and the fixing process are performed. However, shrink fitting is not essential.

  When shrink fitting is performed, after the stator 41 and the sealed container 20 are shrink fitted, a portion of the outer peripheral surface 83 of the sealed container 20 corresponding to the concave portion 72 of the stator 41 is locally heated. Thereafter, the pressing jig 91 is pressed inward in the radial direction against the outer peripheral surface 83 of the sealed container 20, and the convex portion 82 that engages the concave portion 72 is formed in the sealed container 20. And between the recessed parts 72 is clamp | tightened by the some convex part 82 of the airtight container 20 by the heat contraction by cooling of the airtight container 20. FIG. As a result, the stator 41 can be firmly fixed to the sealed container 20, and the stator 41 can be stably fixed to the sealed container 20 without causing rattling when fixed by heat shrinkage. it can.

  In the present embodiment, the stator 41 may be shrink-fitted into the sealed container 20 with such a strength that no minute rattle is generated between the stator 41 and the convex portion 82 of the sealed container 20 when thermally contracted. Therefore, the contact area by shrink fitting of the stator 41 and the airtight container 20 can be significantly reduced compared with the case where it fixes only by the conventional shrink fitting. 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 in a ring shape. A recess 72 formed in the outer peripheral surface 71 of the stator core 43 is provided in each divided core 74. If two adjacent recesses 72 are formed across the two split cores 74, the force acting during the thermal contraction of the corresponding two projections 82 acts to press the two split cores 74 against each other. Therefore, there is a possibility that the inner diameter roundness of the stator core 43 is deteriorated. On the other hand, as shown in FIG. 9, when two adjacent recesses 72 are formed in one split core 74 so as to sandwich the center position in the circumferential direction of one split core 74, Even when the convex portion 82 is thermally contracted, a good inner diameter roundness can be maintained due to the rigidity of the one divided iron core 74, so that the occurrence of magnetic unbalanced sound can be suppressed.

  In the present embodiment, as described above, instead of providing the concave portion 72 of the stator 41 in a groove shape, for example, a rectangular pilot hole may be provided. Even in that case, the stator 41 can be similarly fixed to the sealed container 20. For example, the rectangular pilot hole of the stator 41 can be formed by laminating two types of electromagnetic steel plates. By making the lower hole of the stator 41 into a quadrangular shape, the stator 41 is supported not only by being sandwiched by the convex portions 82 of the sealed container 20 but also by the rigidity of the convex portions 82 of the sealed container 20, so The stator 41 can be fixed to the sealed container 20.

Embodiment 2. FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 17 is a longitudinal sectional view of the compressor manufacturing apparatus 90 and the compressor 12 according to the present embodiment. In addition, FIG. 17 shows the compressor 12 in the process of production in a simplified manner as in FIG.

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

Embodiment 3 FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 18 is a longitudinal sectional view of the compressor manufacturing apparatus 90 and the compressor 12 according to the present embodiment. FIG. 18 shows the compressor 12 in the process of production in a simplified manner, similarly to FIG.

  As shown in FIG. 18, the drive mechanism 96 of the holding jig 95 of the compressor manufacturing apparatus 90 may be mounted as a wedge mechanism. In other words, in the present embodiment, the holding jig 95 is formed with a wedge-shaped drawer rod 98 and a tapered hollow portion into which the drawer rod 98 is inserted, and is externally in contact with the inner peripheral surface 70 of the stator 41. It consists of a mold 97. By pulling the drawer bar 98 downward from the hollow portion of the outer mold 97, the outer mold 97 is driven in the radial direction by the wedge effect, and a force G acts on the inner peripheral surface 70 of the stator 41.

Embodiment 4 FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 19 is a plan view of the compressor manufacturing apparatus 90 and the compressor 12 according to the present embodiment. FIG. 20 is a longitudinal sectional view of the compressor manufacturing apparatus 90 and the compressor 12. 19 and 20 show the compressor 12 in the process of production in a simplified manner, similarly to FIGS. 10 and 11. In FIG. 19, the pressing jig 91 is omitted.

  As shown in FIGS. 19 and 20, the compressor manufacturing apparatus 90 includes another pressing jig 99 that is a pressing press machine in addition to the pressing jig 91 and the pressing jig 95 similar to those of the first embodiment. .

  As in the first embodiment, when the container main body 26 is locally heated and then pressed by the pressing jig 91, the open end of the container main body 26 due to pressurization of the pressing jig 91, thermal contraction of the container main body 26, or the like. The part may be deformed. In the present embodiment, in order to reduce the amount of deformation, the force I is applied by clamping the gap between the upper end surface of the stator 41 and the upper end surface of the sealed container 20 from the outside of the sealed container 20 with the pressing jig 99. .

  That is, the pressing jig 91 forms the two convex portions 82 in a state where the sealed container 20 is heated. These two convex portions 82 are thermally contracted after the sealed container 20 is heated, thereby sandwiching a portion between the two concave portions 72 of the stator 41. At this time, a force that deforms the sealed container 20 works. . Therefore, in the present embodiment, as shown in FIG. 19, the pressing jig 99 causes the radial force I to act on the outer peripheral surface 83 of the sealed container 20 from the outside of the sealed container 20, thereby causing two convex portions. The deformation of the outer peripheral surface 83 of the sealed container 20 due to the heat shrinkage of 82 is suppressed. Specifically, as shown in FIG. 20, the holding jig 99 has a radial direction between one end closer to the stator 41 than the compression mechanism 30 and both ends in the axial direction of the sealed container 20. Force I is applied. Here, the one end closer to the stator 41 than the compression mechanism 30 among the both ends in the axial direction of the sealed container 20 is an open end of the container body 26. For example, as shown in FIG. 20, the holding jig 99 applies a radial force I to four locations on the inner peripheral surface 70 of the stator 41 that are spaced apart at equal intervals. That is, four holding jigs 99 are arranged at equal intervals, and the sealed container 20 is clamped by these holding jigs 99. Thereby, a deformation | transformation of the airtight container 20 can be suppressed. The number of locations where the radial force I is applied, 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, you may implement combining some of these embodiment. Alternatively, any one or some of these embodiments may be partially implemented. For example, only one of those described as “parts” in the description of these embodiments may be employed, or some arbitrary combinations may be employed. In addition, this invention is not limited to these embodiment, A various change is possible as needed.

  DESCRIPTION OF SYMBOLS 10 Refrigeration cycle apparatus, 11a, 11b Refrigerant circuit, 12 Compressor, 13 Four-way valve, 14 Outdoor heat exchanger, 15 Expansion valve, 16 Indoor heat exchanger, 17 Control apparatus, 20 Airtight container, 21 Suction pipe, 22 Discharge pipe , 23 Suction muffler, 24 Terminal, 25 Refrigerating machine oil, 26 Container body, 27 Container lid, 30 Compression mechanism, 31 Cylinder, 32 Rolling piston, 33 Main bearing, 34 Sub bearing, 35 Discharge muffler, 36 vane, 37 vane spring, 40 Electric motor, 41 Stator, 42 Rotor, 43 Stator core, 44 Winding, 45 Lead wire, 46 Rotor core, 47 Insulation member, 48 Top plate, 49 Bottom plate, 50 Crankshaft, 51 Eccentric shaft, 52 Main shaft portion, 53 Sub shaft portion, 61 Vane groove, 62 Cylinder chamber, 63 Back pressure chamber, 70 Inner peripheral surface, 71 Outer periphery , 72 recess, 73 notch, 74 split iron core, 75 teeth, 76 fixed part, 77 projecting part, 78 non-contact area, 79 contact area, 81 inner peripheral surface, 82 convex part, 83 outer peripheral surface, 84 machining hole, 85 Caulking section, 90 compressor manufacturing apparatus, 91 pressing jig, 92 tip section, 93 heating range, 94 heating center, 95 pressing jig, 96 driving mechanism, 97 outer mold, 98 drawer bar, 99 pressing jig.

Claims (5)

An electric motor having a stator and having two concave portions formed along the circumferential direction on the outer peripheral surface of the stator, a compression mechanism driven by the electric motor, and the stator and the compression mechanism are accommodated A compressor manufacturing apparatus for manufacturing a compressor including a container,
By applying a radial force to the outer peripheral surface of the container from the outside of the container, two convex portions arranged along the circumferential direction are formed on the inner peripheral surface of the container, and the two convex portions are A pressing jig that enters two recesses,
A pressing jig that suppresses deformation of the inner peripheral surface of the stator due to the force from the pressing jig by applying a radial force to the inner peripheral surface of the stator from the inside of the stator. ,
The pressing jig forms the two convex portions in a state where the container is heated,
The two convex portions sandwich the portion between the two concave portions of the stator by heat shrinking after the container is heated,
The compressor manufacturing apparatus further includes:
Another pressing jig that suppresses deformation of the outer peripheral surface of the container due to thermal contraction of the two convex portions by applying a radial force to the outer peripheral surface of the container from the outside of the container;
It said other pressing jig includes a compressor manufacturing device Ru by applying a radial force between one end and the stator closer to the stator than the compression mechanism of the axial ends of the container. The two recesses are formed at a plurality of locations in the circumferential direction of the outer peripheral surface of the stator,
The pressing jig applies a radial force to positions corresponding to the plurality of locations on the outer peripheral surface of the container,
The compressor manufacturing apparatus according to claim 1, wherein the pressing jig applies a radial force to positions corresponding to the plurality of locations on the inner peripheral surface of the stator.   The compressor manufacturing apparatus according to claim 1, wherein the pressing jig includes a driving mechanism and an outer mold that is driven in a radial direction by the driving mechanism and contacts an inner peripheral surface of the stator.   The said holding jig consists of a wedge-shaped drawer rod and an outer mold in which a tapered hollow portion into which the drawer rod is inserted is formed and in contact with the inner peripheral surface of the stator. The compressor manufacturing apparatus described in 1. An electric motor having a stator and having two concave portions formed along the circumferential direction on the outer peripheral surface of the stator, a compression mechanism driven by the electric motor, and the stator and the compression mechanism are accommodated A compressor manufacturing method for manufacturing a compressor comprising a container,
By applying a radial force to the outer peripheral surface of the container from the outside of the container by a pressing jig, two convex portions arranged along the circumferential direction are formed on the inner peripheral surface of the container, and the two A convex part enters the two concave parts,
By applying a radial force to the inner peripheral surface of the stator from the inside of the stator by a holding jig, the deformation of the inner peripheral surface of the stator due to the force from the pressing jig is suppressed ,
The pressing jig forms the two convex portions in a state where the container is heated,
The two convex portions sandwich the portion between the two concave portions of the stator by heat shrinking after the container is heated,
The compressor manufacturing method further includes:
By applying a radial force to the outer peripheral surface of the container from the outside of the container by another pressing jig, the deformation of the outer peripheral surface of the container due to thermal contraction of the two convex portions is suppressed,
It said other pressing jig, compressor manufacturing method Ru allowed to act radial force between one end and the stator closer to the stator than the compression mechanism of the axial ends of the container.

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