JP2020094566A - Compressor - Google Patents

Abstract

To provide a compressor not requiring any metal mold and pressing work dedicated to a rotor plate.SOLUTION: A compressor includes a motor 2 and a compressing mechanism part 3 in a sealed container 1. The motor comprises a stator 15 and a rotor 16 arranged in the stator. The rotor 16 is configured so that a dimension in the lamination direction of a rotor core plate constituting a rotor core is equal to or shorter than a dimension in the lamination direction of the stator core plate constituting a stator core of the stator 15. Accordingly, the rotor core plate can form the rotor core having a necessary dimension only by performing composite molding by pressing together with the stator core plate. As a result, a metal mold dedicated to the rotor core plate for press-punching of only the rotor core plate and pressing work for the mold do not required.SELECTED DRAWING: Figure 1

Description

The present invention relates to a compressor used in an air conditioner, a refrigerator, a water heater, etc.

Generally, a compressor is configured by accommodating a compression mechanism portion that compresses a refrigerant gas and an electric motor that drives the compression mechanism portion in a closed container. The electric motor includes a rotor that drives the compression mechanism and a stator that rotationally drives the rotor (see, for example, Patent Document 1).

FIG. 7 shows the compressor described in Patent Document 1, 101 is a closed container, 102 is a compression mechanism portion provided in the closed container 101, 103 is an electric motor for driving the compression mechanism portion 102, and It is fastened and fixed to the bottom. The electric motor 103 includes a rotor 105 that is integrated with a rotary shaft 104 that drives the compression mechanism unit 102, and a stator 106 that is located on the outer periphery of the rotor 105 and rotationally drives the rotor 105. A magnet is embedded inside the rotor 105, and the rotor 105 is driven by a magnetic field generated in the stator 106 to rotate.

JP, 2010-197038, A

In the above-described conventional compressor, the rotor core height of the rotor 105 that constitutes the electric motor is set higher than the stator core height of the stator 106, that is, the number of rotor core plates stacked is greater than the number of stator core plates stacked. In many cases, the total length of the rotor core 105a is set to be higher than that of the stator core 106a. Therefore, there has been a problem that two dies are required when press-punching the rotor core plate serving as the rotor core 105a and the stator core plate serving as the stator core 106a.

That is, as shown in FIG. 8, the rotor core plate and the stator core plate are co-taken from a single electromagnetic steel plate 110 such as a thin silicon steel plate by press punching, but the number of laminated rotor core plates 105aa is equal to that of the stator core plate. The rotor core plates 105aa need to be separately punched by the number corresponding to the number of laminated core plates 106aa. Therefore, there is a problem that a die 113 and the like for punching only the rotor core plate 105aa and the pressing work are required separately from the die 111 and 112 for co-preparation.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a mold for a rotor core plate separately from a co-molding mold and a compressor that does not require press work. is there.

In the present invention, in order to achieve the above object, the dimension in the laminating direction of the rotor core plate that constitutes the rotor core of the rotor is equal to the dimension in the laminating direction of the stator core plate that constitutes the stator core of the stator. The size is shorter than that.

As a result, the rotor core plate can be formed with the stator core plate by pressing together with the stator core plate to form a rotor core having a required size. Therefore, a die for the rotor core plate and a press work for punching only the rotor core plate are not required.

The present invention eliminates the need for a die dedicated to the rotor core plate for press punching only the rotor core plate and the pressing work by the above configuration, and can significantly reduce the die investment and processing cost. Therefore, even a small amount of compressor can be provided at low cost.

1 is a vertical cross-sectional view of a compressor according to Embodiment 1 of the present invention. FIG. 2 is an enlarged cross-sectional view showing a main part of an electric motor of the compressor according to the first embodiment. FIG. 3 is a vertical cross-sectional view of the compressor according to the second embodiment of the present invention. FIG. 4 is an enlarged cross-sectional view showing a main part of an electric motor of the compressor according to the second embodiment. FIG. 5 is a perspective view showing a rotor of the compressor according to the second embodiment. FIG. 6 is a perspective view showing a rotor of the compressor according to the third embodiment of the present invention. FIG. 7 is a vertical sectional view of a conventional compressor. FIG. 8: is a figure explaining the process of co-picking up the rotor core plate and stator core plate of the conventional compressor.

A first aspect of the present invention includes an electric motor and a compression mechanism unit in a closed container, the electric motor has a stator and a rotor arranged in the stator, and the rotor has laminated rotor core plates. A rotor core, the stator has a stator core in which stator core plates are stacked, and the rotor has a rotor core plate stacking direction length of the stator stator core plate stacking direction The length is equal to or shorter than the length of the structure.

As a result, the rotor core plate can be formed with the stator core plate by pressing together with the stator core plate to form a rotor core having a required size. Therefore, it is not necessary to use a die dedicated to the rotor core plate and press work for punching only the rotor core plate.

A second aspect of the present invention is configured such that, in the first aspect, the rotor has a magnet on an outer peripheral surface of the rotor.

As a result, if the magnet of the rotor is made longer than the length of the rotor core plate in the laminating direction, the magnetic flux can be radiated toward the stator core from the lengthened part, that is, the part protruding from the rotor core. Therefore, even if the dimension in the laminating direction of the rotor core plate is made equal to or shorter than the dimension in the laminating direction of the stator core plate, the efficiency of the electric motor can be secured.

According to a third aspect of the present invention, in the second aspect, the magnet is longer than the length of the stator core in the stacking direction of the stator core plate.

As a result, the magnet is projected from the end of the stator core, and the magnetic flux is radiated toward the stator core from the protruding portion as well. Therefore, increase the magnetic flux radiated from the magnet to the stator core. It is possible to improve the efficiency of the electric motor.

In a fourth aspect based on the second or third aspect, the rotor core of the rotor is fitted and fixed to a rotary shaft for driving a compression mechanism which is axially supported by a bearing portion of the compression mechanism, and the magnet is In the rotation axis direction of the rotor core, the rotor core projects toward the compression mechanism portion opposite to the fitting and fixing portion.

As a result, the length of the fitting and fixing portion of the rotor core to the rotary shaft protruding from the end edge of the bearing of the compression mechanism is maintained while maintaining the long shaft support length of the bearing that axially supports the rotary shaft of the compression mechanism. The length can be lengthened. Therefore, it is possible to prevent shaft center deviation of the rotary shaft of the compression mechanism portion, and to firmly fix and fit the rotor core to the rotary shaft, thus stabilizing the quality.

A fifth invention is configured such that, in the second to fourth inventions, the magnet has a balance weight inside a portion protruding from the rotor core.

As a result, the balance weight can be installed by utilizing the space inside the magnet. The quality can be stabilized.

In a sixth aspect based on the second to fifth aspects, the rotor has magnet fixing plates at both ends of the rotor core plate in the stacking direction, and the magnet fixing plate is an outer peripheral side portion of the magnet. Has a collar portion that covers at least a part of the structure.

As a result, the magnet fixed by adhesion or the like to the outer peripheral surface of the rotor can be firmly fixed, and the magnet can be prevented from coming off due to centrifugal force or the like, and the reliability of magnet fixing can be improved. Further, when the balance weight is provided on the inner side of the magnet protruding from the rotor core, there is also an advantage that the balance weight can be fixed together by fixing the magnet fixing plate to the rotor core.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment.

(Embodiment 1)
FIG. 1 is a vertical cross-sectional view of a compressor according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view showing an electric motor main part of the compressor.

The compressor of the present embodiment is configured by providing an electric motor 2 and a compression mechanism section 3 in a closed container 1. The electric motor 2 is fastened and fixed to the lower portion of the compression mechanism section 3. The electric motor 2 and the compression mechanism section 3 are suspended by a suspension spring 4. In the closed container 1, a refrigerant 5 made of R600a (isobutane) having a low global warming potential and a lubricating oil 6 made of mineral oil having a large compatibility with R600a are stored at the bottom. A terminal 7 for supplying electricity to the electric motor 2 is provided on the lower side surface of the closed container 1.

The compression mechanism section 3 is of a reciprocating type in which a compression chamber 9 is formed in a cylinder block 8 which is the main body of the compression mechanism section 3, and a piston 10 reciprocates in the compression chamber 9 to compress the refrigerant.

The cylinder block 8 of the compression mechanism portion 3 is provided with a compression chamber 9 and a bearing portion 11 having a cylindrical inner surface, and the bearing portion 11 pivotally supports a rotary shaft 12 for reciprocating the piston 10.

The rotary shaft 12 is composed of a main shaft portion 12a that is axially supported by the bearing portion 11 and an eccentric shaft portion 12b that is formed above the main shaft portion 12a. The eccentric shaft portion 12b of the rotating shaft 12 is connected to the piston 10 through the connecting means 13, and converts the rotational motion of the rotating shaft 12 into a reciprocating motion to reciprocate the piston 10.

Further, the lower end of the main shaft portion 12a of the rotary shaft 12 is immersed in the lubricating oil 6 stored in the bottom portion of the closed container 1, and the bearing is provided by the oil supply mechanism 14 including a spiral groove on the outer surface of the main shaft portion 12a. The portion 11 and the eccentric shaft portion 12b are connected to the connecting portion of the connecting means 13 and the like to supply oil.

The piston 10 is loosely fitted in the compression chamber 9 and is reciprocated by the eccentric shaft portion 12b of the rotary shaft 12 via the connecting means 13 as described above, and the space of the compression chamber 9 is expanded or contracted to thereby close the inside of the closed container 1. The refrigerant 5 is compressed. The compressed refrigerant 5 is discharged to the refrigeration cycle connected to the compressor.

Next, the configuration of the electric motor 2 will be described.

As shown in FIG. 2, the electric motor 2 is an inner rotor type DC brushless motor having a rotor 16 inside a stator 15 and is driven by an inverter by an inverter circuit unit (not shown). The rotor 16 is fitted and fixed to the rotary shaft 12 for driving the compression mechanism, which is rotatably supported by the bearing 11 of the compression mechanism 3.

The stator 15 includes a stator core 15a formed by stacking a stator core plate made of electromagnetic steel sheet such as a silicon steel plate having a thickness of 0.2 mm to 0.5 mm, and a stator winding that is a copper wire with an insulating coating. It consists of 17. The stator 15 is a salient pole concentrated winding type in which salient pole portions are formed in an annular shape at predetermined intervals, and a stator winding 17 is wound around the salient pole portion. That is, the stator 15 includes a ring-shaped annular portion and a plurality of salient pole portions arranged on the inner peripheral side of the annular portion, and the stator winding 17 is provided around the salient pole portion. The windings are connected to each other by a connecting wire and are connected to the terminal 7.

The rotor 16 includes a rotor core 16a formed by stacking rotor core plates made of an electromagnetic steel plate such as a 0.2 mm to 0.5 mm silicon steel plate of the same material as the stator core plate, and a rotor core 16a. A permanent magnet (hereinafter, simply referred to as magnet) 18 fixed to the outer peripheral surface with an adhesive or the like is formed, and the surface magnet type rotor is provided. The thickness of one rotor core plate is substantially the same as the thickness of one stator core plate.

As shown in FIG. 2, the height dimension of the rotor 16, that is, the dimension L2 of the rotor 16 in the direction in which the rotor core plates are stacked is the height dimension of the stator 15, that is, the stator 15. Is equal to or shorter than the dimension L1 in the direction in which the stator core plates are laminated. Hereinafter, the direction in which the rotor core plates or the stator core plates are stacked is referred to as the stacking direction, and the dimension in the stacking direction is referred to as the stacking direction dimension.

The height dimension L3 of the magnet 18 fixed to the outer peripheral surface of the rotor 16 (dimension in the laminating direction of the rotor core 16a) is at least longer than the dimension L2 in the laminating direction of the rotor core 16a. It is longer than the stacking direction dimension L1 of the iron core 15a.

Moreover, the upper end of the magnet 18 projects upward from the upper end of the rotor core 16a. In other words, the magnet 18 is bonded to the rotor core 16a in such a manner that the magnet 18 projects to the side of the compression mechanism 3 on the side opposite to the mating joint X of the rotor core 16a fitted to the rotary shaft 12 to the rotary shaft 12. It is fixed. The lower end of the magnet 18 is located at substantially the same height as the lower end of the rotor core 16a. The center of the magnet 18 in the height direction (the stacking direction of the rotor core 16a) is located at substantially the same height as the center of the stator core 15a in the height direction.

Next, the function and effect of the compressor configured as described above will be described.

The compressor energizes the stator winding 17 of the electric motor 2 to generate a magnetic field in the stator core 15a to rotate the rotor 16, and the rotation of the rotor 16 drives the rotary shaft 12 to rotate the eccentric shaft. The piston 10 is reciprocated through the portion 12b and the connecting means 13 to perform a compression operation.

Here, in the compressor of the present embodiment, the dimension L2 in the laminating direction of the rotor core plates forming the rotor core 16a of the electric motor 2 is the dimension L1 in the laminating direction of the stator core plates forming the stator core 15a. The number of laminated rotor core plates may be the same as or smaller than the number of laminated stator core plates.

Therefore, the rotor core plate can be formed into the rotor core 16a having a required size simply by taking the rotor core plate together with the stator core plate by pressing. Therefore, it is not necessary to use a die dedicated to the rotor core plate and press work for punching only the rotor core plate.

If the number of laminated rotor core plates is less than the number of laminated stator core plates, a mold for press punching only the stator core plates may be necessary in addition to the mold for co-processing. .. However, the probability of occurrence of defective products is lower in the stator core plate than in the rotor core plate when press punching is performed using a co-die. For this reason, the stator core plate can be manufactured in a larger number than the rotor core plate by press punching using the co-die. Therefore, it is not necessary to prepare a die for punching only the stator core plate separately from the die for co-fabrication.

On the other hand, in this compressor, since the length of the rotor core 16a is shorter than that of the stator core 15a, the efficiency of the electric motor may decrease.

However, in the compressor of the present embodiment, the rotor 16 of the electric motor 2 is a surface magnet type rotor in which the magnet 18 is fixed to the outer peripheral surface of the rotor core 16a, so the magnetic flux of the magnet 18 is the stator core 15a. Is radiated toward.

Therefore, as shown in the present embodiment, if the height dimension L3 of the magnet 18 is set to be higher than the height dimension L2 of the rotor 16, the magnetic flux is radiated from the portion protruding from the rotor 16 to the stator side. As a result, the rotor 16 can be shortened to compensate for the reduced magnetic flux, and the efficiency of the electric motor 2 can be ensured.

Further, as in the present embodiment, since the magnet 18 is formed higher than the stator 15 which is higher than the rotor 16, the magnetic flux is also radiated from that portion to the stator core 15a. Therefore, the magnetic flux radiated from the magnet 18 to the stator core 15a can be further increased. Therefore, the efficiency of the electric motor can be further increased, and the efficiency can be increased to substantially the same level as that of the electric motor having the conventional configuration.

The rotor core 16a of the rotor 16 is fitted and fixed to the rotary shaft 12 for driving the compression mechanism, which is rotatably supported by the bearing portion 11 of the compression mechanism portion 3. The magnet 18 of the rotor core 16a rotates. The child iron core 16 a is fixed to the rotor 16 by protruding toward the compression mechanism portion 3 side opposite to the fitting and fixing portion X on the rotary shaft 12.

This makes it possible to increase the length of the fitting fixing portion X of the rotor core 16a on the rotary shaft 12 protruding from the bearing end edge Y of the compression mechanism portion 3. Further, it is possible to secure a long shaft support length L4 for the rotary shaft 12 of the bearing portion 11 that supports the rotary shaft 12 of the compression mechanism portion 3. Therefore, it is possible to prevent the shaft center of the rotating shaft 12 from moving, and to firmly fix and fit the rotor core 16a to the rotating shaft 12, thereby stabilizing the quality.

(Embodiment 2)
3 is a vertical cross-sectional view of the compressor according to the second embodiment, FIG. 4 is an enlarged cross-sectional view showing an essential part of an electric motor of the compressor, and FIG. 5 is a perspective view showing a rotor of the compressor.

The compressor of the present embodiment has a configuration in which a balance weight 19 is provided on the inner side (opposite side of the stator 16) of the magnet 18 protruding from the rotor core 16a.

As a result, the balance weight 19 can be installed by utilizing the space inside the magnet that is generated by making the magnet 18 longer than the rotor core 16a, and the rotation of the sealed container 1 which is concerned by making the magnet 18 longer. It is possible to stabilize the quality while suppressing an increase in the size of the child core plate stacking direction, that is, the height direction.

Other configurations, functions and effects are similar to those of the first embodiment, and the same parts are denoted by the same reference numerals and the description thereof is omitted.

(Embodiment 3)
FIG. 6 is a perspective view showing a rotor of the compressor according to the third embodiment.

The rotor 16 of the present embodiment includes magnet fixing plates 21 at both ends (upper and lower ends) in the stacking direction. The magnet fixing plate 21 includes both end portions in the laminating direction of the rotor core 16a, and a collar portion 20 that stands up in a direction substantially perpendicular to the plane of the both end portions in the laminating direction. The collar portion 20 overlaps with the outer circumference of the end edge of the magnet 18 at the upper and lower ends of the rotor core 16 a.

As a result, the magnet 18 fixed to the outer peripheral surface of the rotor core 16a by adhesion or the like can be mechanically fixed, and the magnet 18 can be prevented from coming off due to centrifugal force or the like, and the reliability of magnet fixing can be improved. Can be improved. Further, the balance weight 19 provided inside the magnet 18 protruding from the rotor core 16a can be fixed together by fixing the magnet fixing plate 21 to the rotor core 16a.

In the present embodiment, each of the magnet fixing plate 21 provided at the upper end and the magnet fixing plate 21 provided at the lower end is provided with the collar portion 20, but one of them has the collar portion 20. However, the other may not be provided.

Although the compressor according to the present invention has been described above using the above-described embodiment, the present invention is not limited to this. That is, the embodiment disclosed this time is illustrative in all points and not restrictive, and the scope of the present invention is shown by the scope of claims, and is equivalent to the scope of claims and within the scope. It includes all changes.

INDUSTRIAL APPLICABILITY As described above, the present invention eliminates the need for a die dedicated to the rotor core plate for press punching only the rotor core plate and the press work, and greatly reduces the die investment and the processing cost. Therefore, even a small amount of compressor can be provided at low cost. Therefore, it can be used as a compressor of a refrigeration system for various devices such as an air conditioner, a refrigerator, a blower, and a water heater.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Electric motor 3 Compression mechanism part 4 Suspension spring 5 Refrigerant 6 Lubricating oil 7 Terminal 7a Power supply terminal 8 Cylinder block 9 Compression chamber 10 Piston 11 Bearing part 12 Rotating shaft 12a Main shaft part 12b Eccentric shaft part 13 Connecting means 14 Oil supply mechanism 15 Stator 15a Stator core 16 Rotor 16a Rotor core 17 Stator winding 18 Magnet (permanent magnet)
19 Balance weight 20 Collar 21 Magnet fixing plate

Claims (6)

An electric motor and a compression mechanism are provided in a closed container, the electric motor has a stator, and a rotor arranged in the stator, and the rotor has a rotor core in which rotor core plates are laminated. The stator has a stator core in which stator core plates are laminated, and the rotor has a length in the laminating direction of the rotor core plates that is equal to or longer than a length in the laminating direction of the stator core plates of the stator. Shorter, compressor. The compressor according to claim 1, wherein the rotor has a magnet on an outer peripheral surface of the rotor. The compressor according to claim 2, wherein the magnet is longer than the length of the stator core in the stacking direction of the stator core plate. The rotor core of the rotor is fitted and fixed to a rotary shaft for driving the compression mechanism, which is rotatably supported by a bearing portion of the compression mechanism, and the magnet is connected to the fitting and fixed portion in the rotation axis direction of the rotor core. The compressor according to claim 2 or 3, wherein the compressor projects toward the compression mechanism section on the opposite side. The compressor according to any one of claims 2 to 4, wherein the magnet has a balance weight inside a portion protruding from the rotor core. The rotor has a magnet fixing plate at each of both ends of the rotor core plate in the stacking direction, and the magnet fixing plate has a flange portion that covers at least a part of an outer peripheral side portion of the magnet. The compressor according to any one of 1.