JP6393077B2 - Hermetic electric compressor - Google Patents

Description

  The present invention relates to a hermetic electric compressor used in a refrigeration air conditioner or the like.

  Patent Document 1 is known as a conventional hermetic electric compressor. In FIG. 1 of Patent Document 1, the connection between the stator and the hermetic container is via a gap, and the stator is hermetically sealed by nine point joints arranged on two planes with different axial directions of the stator. Fixed. The compressor of Patent Document 1 is aimed at improving the stator restraining force and reducing noise and vibration caused by the motor. “Compressor capable of improving casing rigidity and suppressing compressor noise” (Page 3, line 17).

JP 2011-102543 A

  In the compressor shown in Patent Document 1, discrete stress is applied to the outer periphery of the stator by the point joint, unlike when the stator is fixed in the hermetic container all around the outer periphery of the stator by shrink fitting or press fitting. Occurs. Accordingly, the inner diameter of the stator core is deformed in a convex shape with respect to the inner side of the stator iron core due to the stress of point bonding, and the concave shape is deformed with respect to the inner side of the stator iron core between each point joint. And the spatial distance between the stator and the rotor becomes non-uniform so that the magnetic flux line density in one rotation of the rotor increases and decreases, and there is a concern that the motor efficiency decreases and the noise increases.

  In addition, since the number of point joints is greater than or equal to the number of teeth of the stator, the number of point joints increases as the number of teeth of the stator increases. There is concern about the increase in noise caused by the motor due to the increase in the number of joints between the sealed container and the production, and the increase in cost and time must be taken into consideration.

  For this reason, it is desirable that the deformation of the inner diameter of the stator core due to the stress at the point joint is as small as possible, and the number of the point joints is small within a range where the stator can be stably fixed.

  However, in Cited Document 1, even when the point junctions on two planes perpendicular to the stator axis are each three points, the inner diameter of the stator iron core is arranged in parallel to the axial direction of the stator. Convex shape deformation and concave shape deformation are promoted by the principle of superposition, and the cross-sectional shape of the stator core inner diameter is changed from the original substantially circular shape to a substantially triangular shape, so that further stator-rotor There is a concern that the spatial distance of the motor becomes non-uniform and the motor efficiency decreases and the noise increases.

  An object of the present invention is to make the spatial distance between the stator and the rotor uniform, and to achieve an improvement in motor efficiency and a reduction in noise.

The hermetic electric compressor of the present invention has an electric motor composed of a stator and a rotor in a hermetic container and a compression mechanism driven by the motor, and the stator is fitted into the hermetic container with a gap, The number of slots is a natural number multiple of 6, and the first point joints are arranged at intervals of about 120 degrees on the first plane perpendicular to the axial direction of the stator and the first perpendicular to the axial direction of the stator. The stator is fixed to the hermetic container by three second point joints arranged on the two planes at intervals of about 60 degrees with respect to the first point joint, and the first point joint and the second point joint are While being arrange | positioned between the teeth parts of a stator, the said stator laminates | stacks several steel plates and it crimps by the said 1st point junction part and the said 2nd point junction part .
Alternatively, the hermetic electric compressor of the present invention has an electric motor including a stator and a rotor and a compression mechanism driven by the electric motor in the hermetic container, and the stator is in the hermetic container. The stator is fitted into a gap, and the stator has a number of slots that is a natural number multiple of 6, and is a three-point first point joint disposed on a first plane perpendicular to the axial direction of the stator at an interval of approximately 120 degrees, And the first point joint on a second plane that is perpendicular to the axial direction of the stator and that has a central portion in the axial direction of the stator as a symmetric center and is symmetrical to the first plane. On the other hand, the stator is fixed to the hermetic container by three second point joint portions arranged at intervals of approximately 60 degrees, and the first point joint portion and the second point joint portion are teeth portions of the stator. Arranged between.

  According to the hermetic electric compressor of the present invention, the deformation of the stator core inner diameter can be suppressed, the stator core inner diameter can be kept substantially circular, and the spatial distance between the stator and the rotor can be made uniform. As a result, motor efficiency can be improved and noise can be reduced.

1 is a longitudinal sectional view of a hermetic electric compressor in Embodiment 1. FIG. FIG. 3 is a longitudinal sectional view of an electric motor unit according to the first embodiment. FIG. 3 is a cross-sectional view of the electric motor unit according to the first embodiment. The schematic diagram of a deformation | transformation of the stator iron core internal diameter by the point joining of an electric motor part. The schematic diagram of a deformation | transformation of the stator iron core internal diameter by the point joining of the electric motor part in the present Example 1. FIG. FIG. 6 is a cross-sectional view of an electric motor unit according to the second embodiment. FIG. 6 is a cross-sectional view of an electric motor unit according to the third embodiment.

  The hermetic electric compressor of the present embodiment has an electric motor composed of a stator and a rotor in a hermetic container and a compression mechanism driven by the motor, and the stator is fitted in a gap in the hermetic container. Has a number of slots that is a natural number multiple of 6, and is arranged at 120 ° intervals on a first plane perpendicular to the axial direction of the stator and perpendicular to the axial direction of the stator. The stator is fixed to the hermetic container by three second point joints arranged on the second plane at intervals of about 60 degrees with respect to the first point joints, and the first point joint and the second point joint. Is arranged between the teeth of the stator. According to the hermetic electric compressor of this embodiment, the deformation of the stator iron core inner diameter is suppressed, the stator iron core inner diameter is kept nearly circular, and the spatial distance between the stator and the rotor is made uniform. Therefore, motor efficiency can be improved and noise can be reduced.

  The first embodiment will be described below with reference to FIGS. In the present embodiment, as shown in FIG. 1, a rotary compressor will be described as an example of a hermetic electric compressor.

  In the rotary compressor shown in FIG. 1, an electric motor having a stator 12 and a rotor 13, a crankshaft 2 having an eccentric portion for transmitting the rotation of the rotor 13, and a crankshaft And a compression mechanism unit that performs compression work with the rotational power of 2. The compression mechanism portion is provided in the cylinder 3 according to the eccentric motion of the cylinder 3, the roller 4 disposed in the cylinder 3 and driven to rotate by the eccentric portion of the crankshaft 2, and the roller 4. A vane 5 entering and exiting the groove, an upper bear 6 having a bearing portion that closes the upper end surface of the cylinder 3 and holds the crankshaft 2, and a bearing portion that closes the lower end surface of the cylinder 3 and holds the crankshaft 2. And a lower bear 7 having the same.

  In the compression mechanism, the refrigerant gas flows into the cylinder 3 from the tank 15 opened in the cylinder 3, and the inner wall surface of the cylinder 3, the outer wall surface of the roller 4, the side surface of the vane 5, and the inner wall surface of the upper bear 6. The pressure is increased in the compression chamber formed by the inner wall surface of the lower bear 7, and the cylinder 3 or the upper bear 6 serving as a vertical closing member of the cylinder 3 or the discharge port 8 provided in the lower bear 7 enters the sealed container 1. Discharged.

  FIG. 1 shows an example when the discharge port 8 is provided in the upper bear 6 as an example. The upper bear 6 is provided with a digging portion to prevent the high-pressure gas in the sealed container 1 from flowing into the compression chamber at the discharge port 8 and the discharge port 8, and the gas pressure Pd in the sealed container 1 and the pressure in the compression chamber 1 A cup that covers the discharge valve 9 and the retainer 10 is housed in which the discharge valve 9 that opens when Pd ′ ≧ Pd is satisfied due to the differential pressure with the gas pressure Pd ′ and the retainer 10 that determines the opening of the discharge valve 9 are accommodated. Consists of muffler 11.

  FIG. 2 is a longitudinal sectional view of the stator 12, the hermetic container 1, and the point joints 14a and 14b of the hermetic electric compressor according to this embodiment. In FIG. 2, only the parts necessary for the description of the present embodiment among the constituent parts of the stator 12 and the sealed container 1 are shown in a simplified manner.

  The inner diameter of the hermetic container 1 is set so that the stator 12 has a clearance fit. At a plurality of locations on the outer periphery of the hermetic container 1, the stator 12 and the hermetic container 1 are fixed by point joining by the point joint portions 14 a and 14 b. In addition, the iron core of the stator 12 is composed of laminated steel plates, and the steel plates are joined by an auto-clamp system that performs caulking work at the same time when the iron core is processed into a sheet metal (welding, welding, adhesion by varnish, screw Alternatively, rivet caulking or the like may be used), and the strength can be further improved.

  In FIG. 2, the gap h is expressed with a very large emphasis, but it is sufficient if the gap can be fitted to a certain extent. As a guideline, it is not required to be small enough that the stator 12 cannot be inserted into the sealed container 1 unless it is centered by a machine. It is sufficient if the stator 12 is small enough to be manually inserted into the sealed container 1. is there.

  In addition to the spot welding shown in FIG. 2, the point joint may be press-fitted, shrink-fitted, or tightened with a screw through a stator or a protrusion provided on the outer periphery or the inner periphery of the sealed container. In this embodiment, an example in which point welding is spot welding will be described.

  Spot welding is performed by making a hole in the sealed container 1 and pouring the welding agent there. The shape of the illustrated welding agent is expressed like a screw or a rivet in a cartoon style. The portion corresponding to the foot of the screw or rivet expressed between the hermetic container 1 and the stator 12 has a length of about 6 mm, which is substantially the same as that of the hole, although there is actually almost no foot length.

  FIG. 3 is an example of a cross-sectional view of the electric motor unit in the first embodiment, FIG. 4 is a schematic diagram of the deformation of the inner diameter of the stator core due to the point joining of the electric motor unit, and FIG. 5 is the electric motor in the first embodiment. It is a schematic diagram of a deformation | transformation of the stator iron core internal diameter by the point joining of a part. However, in order to make it easy to understand, FIGS. 3, 4, and 5 show only the parts necessary for the description among the constituent parts of the stator 12 and the sealed container 1.

  In the present embodiment, the stator is a three-point point joining portion that is perpendicular to the axial direction and is arranged at a distance of approximately 120 degrees on a plane within a range of 10 mm from the upper end of the stator with respect to the axial direction of the stator 14a and three-point point joining that is perpendicular to the axial direction and arranged at approximately 60 degree intervals with respect to the point joining part 14a on a plane within a range of 10 mm from the lower end of the stator with respect to the axial direction of the stator It fixes to an airtight container by the part 14b. Furthermore, the point junctions 14a and 14b are arranged between the teeth of the stator having a number of slots that is a natural number multiple of six. These effects will be described with reference to FIGS.

  As described above, the number of point joints is within a range where the stator can be stably fixed from the viewpoint of deformation of the stator core inner diameter, propagation of vibration from the stator to the sealed container, production cost, and time. A small number is desirable.

  In general, an object is stabilized by fixing three points. Therefore, the stator is stabilized by fixing with three point joints on a plane perpendicular to the axial direction of the stator, but a point joint is formed in consideration of the vertical balance in the axial direction of the stator. The plane is the central portion in the axial direction of the stator.

  However, the deformation of the inner diameter of the stator iron core due to the point joining becomes a substantially triangular shape as shown in FIG. 4, and the deformation of the inner diameter of the stator iron core has the most influence on the performance of the motor. As a result, the spatial distance between the stator and the rotor becomes non-uniform, and the magnetic flux line density within one rotation of the rotor increases and decreases, so there is a concern that the motor efficiency is lowered and noise is increased.

  Furthermore, since the stator is made of steel plate, its weight is large, and an increase in the number of laminations is required with the recent increase in motor efficiency. Therefore, when fixing the stator only on one plane by point joining, There is concern about peeling of the steel sheet.

  For this reason, in order to fix stably also with respect to the axial direction of a stator, it is desirable to provide point joining of 3 points | pieces on two planes perpendicular | vertical to the axial direction of a stator. By configuring the point joint portion in this manner, it is possible to suppress deformation of the central portion in the axial direction of the stator having the stator core inner diameter. Furthermore, by making the point joints on each plane approximately 120 degrees apart and between two planes approximately 60 degrees apart, at the central part in the axial direction of the stator, convex and concave shapes due to the stress of each point joint are provided. By suppressing the deformation from each other, the spatial distance between the stator and the rotor can be more effectively equalized. Here, the deformation of the inner diameter of the stator iron core due to the point joining is affected by the stress of the point joining and the rigidity of the stator iron core. That is, the deformation of the inner diameter of the stator iron core is influenced by the shape of the stator that receives the stress in addition to the bonding conditions of the point bonding that affects the stress. For this reason, between the teeth of the stator having the number of slots that is a natural number multiple of 6 between the tooth portions of the stator and at intervals of approximately 120 degrees on the two planes perpendicular to the axial direction of the stator as described above, and between the two planes. It arrange | positions in the position used as a space | interval of about 60 degree | times. Since the relationship between the point joining position and the shape of the stator iron core that receives the point joining can be made the same, variation in the deformation of the stator iron core due to the point joining can be effectively suppressed.

  Even in the case where the shape of the stator iron core that receives the point joining and the point joining is different, it is possible to suppress variations in deformation by adjusting the joining conditions. It is necessary to take into consideration that the difference is that there is a concern that the management will be complicated and the number of processes will increase.

  Here, by making the two planes as far as possible both ends of the stator with respect to the axial direction of the stator, deformation of the central portion in the axial direction of the stator having an inner diameter of the stator core can be suppressed. However, since the point joint is about 6 mm as described above, the point joint A is within about 10 mm from the upper end of the stator with respect to the axial direction of the stator, and the point joint B is in the axial direction of the stator. On the other hand, it is preferable to be within about 10 mm from the lower end of the stator.

  A second embodiment will be described. In the present embodiment, the stator is formed by laminating a plurality of steel plates, and caulking at the point joint portion, thereby producing a hermetic electric compressor. FIG. 6 shows an example in which an auto clamp of a stator iron core is provided at a point joining position with respect to FIG. The auto clamp is provided for preventing peeling of the stator core lamination. However, since the auto clamp has a structure bent with respect to the axial direction of the stator, the mechanical rigidity in the stator radial direction is high. For this reason, by providing an auto clamp at the point joining position, it is possible to suppress the convex deformation of the stator iron core inner diameter due to the stress of the point joining. As a result, the concave deformation of the stator core inner diameter between each point joint can also be suppressed, so that the deformation of the stator core inner diameter can be effectively suppressed, the motor efficiency is improved, and noise is reduced. Can be made.

  A third embodiment will be described. In the present embodiment, the stator is formed by laminating a plurality of steel plates, and caulking is performed between the point joints, whereby the hermetic electric compressor is manufactured. FIG. 7 is an example in which an auto clamp of a stator iron core is provided between each point joint with respect to FIG. By providing an auto clamp of the stator iron core between each point joint, the mechanical rigidity in the radial direction of the stator due to the auto clamp increases, and the concave shape deformation between each point joint due to the stress of the point joint is increased. Since it can suppress, a deformation | transformation of a stator iron core internal diameter can be suppressed effectively, motor efficiency improves, and also noise can be reduced.

  In addition, a present Example is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment. Moreover, the component parts of FIGS. 1-9 have shown what is considered necessary for description, and do not necessarily show all the component parts on a product.

1 closed container 2 crankshaft 3 cylinder 4 roller 5 vane 6 upper bear 7 lower bear 8 discharge port 9 discharge valve 10 retainer 11 cup muffler 12 stator 13 rotor 14a spot weld (upper)
14b spot weld (downward)
14c spot weld (center)
15 tank 16 auto clamp

Claims (6)

In a sealed container, an electric motor composed of a stator and a rotor, and a compression mechanism driven by the electric motor,
The stator is fitted into the sealed container with a gap,
The stator has a number of slots that is a natural number multiple of 6;
Three first point joints arranged at intervals of approximately 120 degrees on a first plane perpendicular to the axial direction of the stator, and the first point on a second plane perpendicular to the axial direction of the stator The stator is fixed to the hermetic container by three second point joints arranged at intervals of approximately 60 degrees with respect to the joint,
The first point joint and the second point joint are disposed between the teeth of the stator ,
The stator is a hermetic electric compressor in which a plurality of steel plates are laminated and caulked at the first point joint and the second point joint .   2. The sealed electric motor according to claim 1, wherein the first point joint is formed in a range of 10 mm from the upper end of the stator, and the second point joint is formed in a range of 10 mm from the lower end of the stator. Compressor.   In a sealed container, an electric motor composed of a stator and a rotor, and a compression mechanism driven by the electric motor,
  The stator is fitted into the sealed container with a gap,
  The stator has a number of slots that is a natural number multiple of 6;
  Three first point joints arranged on a first plane perpendicular to the axial direction of the stator at intervals of approximately 120 degrees, and the axial direction of the stator that is perpendicular to the axial direction of the stator The center of the center of the second point joints arranged on the second plane located symmetrically with the first plane at intervals of about 60 degrees with respect to the first point joints, The stator is fixed to an airtight container;
  The hermetic electric compressor in which the first point joint and the second point joint are disposed between the teeth of the stator.   4. The sealed electric motor according to claim 3, wherein the first point joint is formed in a range of 10 mm from the upper end of the stator, and the second point joint is formed in a range of 10 mm from the lower end of the stator. Compressor.   5. The hermetic electric compressor according to claim 3, wherein the stator is manufactured by laminating a plurality of steel plates and caulking at the point joints.   5. The hermetic electric compressor according to claim 3, wherein the stator is manufactured by laminating a plurality of steel plates and caulking between the point joints.