JP7012264B2 - Compressor - Google Patents

Description

The present invention relates to a compressor used in an air conditioner, a refrigerator, a blower, a water heater, and the like.

Generally, a compressor is configured by accommodating a compression mechanism unit that compresses a refrigerant gas and an electric motor unit that drives the compression mechanism unit in a closed container. The electric motor portion is composed of a stator fixed to the inner wall surface of the closed container and a rotor for transmitting rotational power to the drive shaft, and the stator is fixed by shrink fitting or welding.

However, fixing by shrink fitting has a problem that the stator is deformed by the contraction stress of the closed container and the efficiency of the motor portion is lowered. That is, compressive stress is applied to the stator, the stator plate constituting the stator is distorted, and magnetic field distortion is generated when the rotor is rotated, which causes a decrease in the efficiency of the motor unit.

Therefore, recently, a method of welding and fixing to a closed container by stator laser welding or the like is becoming mainstream (see, for example, Patent Document 1).

FIG. 6 is a compressor described in Patent Document 1, in which the stator 101 of the motor unit 100 is fixed to the inner peripheral surface of the closed container 102 by welding 103.

Japanese Unexamined Patent Publication No. 2008-45331

However, when the stator is welded and fixed as in Patent Document 1, the stator is locally distorted due to the high temperature and heat generated by the welding, so care must be taken in adjusting the welding time and the amount of heat.

In particular, recently, in order to improve the efficiency of the motor unit, the stator plate constituting the stator has been made thinner, and the local strain of the stator tends to increase with this thinning. , Adjustment of welding time and heat quantity has become a big issue.

Further, in order to further improve the efficiency of the motor, the present inventors are trying to form the stator plate with a nanocrystal material and reduce the thickness to about 1/10 of the conventional thickness. By forming this stator plate from nanocrystal material and reducing its thickness to 0.1 mm or less, preferably several tens of microns, which is about 1/10 of the conventional one, the efficiency of the motor can be greatly improved. ..

However, in the motor unit configured in this way, the nanocrystal material constituting the stator plate is fragile, and the stator plate is thinned to 0.1 mm or less, preferably about several tens of microns to form a film. Therefore, when the stator is fixed by welding, the stator is greatly deformed and the stator itself cannot be fixed by welding.

Therefore, the present inventors tried to fix the stator by shrink-fitting, which is another fixing method, but since the nanocrystal material is fragile, the stator plate itself is affected by the compressive stress from the closed container applied to the stator. The efficiency of the motor unit is greatly reduced by accelerating the decrease in efficiency due to the magnetic field distortion during rotation, which is seen in the case of conventional shrink fitting due to cracks and the like. That is, the result is that the high efficiency of the motor part obtained by forming the stator plate with nanocrystal material and reducing the thickness to several tens of microns, which is about 1/10 of the conventional one, cannot be sufficiently obtained. Will end up.

The present invention has been made in view of such a point, and an object of the present invention is to obtain a high-performance compressor even if a thin stator plate is used.

The present invention is a compressor in which a motor unit and a compression mechanism unit driven by the motor unit are housed in a closed container in order to achieve the above object, and the motor unit is a stator and a rotor. On the outer peripheral surface of the stator, a plurality of concave grooves are formed to return the oil separated from the refrigerant to the lower part of the closed container, and the stator plate of the stator is a film of 0.1 mm or less. It is a thin plate and is provided with a pair of annular members to be fixed to the closed container. One of the annular members is formed with a pin shaft, and the other annular member is formed with a hole into which the pin shaft is fitted. A plurality of the pin shafts are arranged in the plurality of concave grooves formed on the outer peripheral surface of the stator, and both ends of the stator are sandwiched between the annular members .

As a result, the motor does not need to fix the stator to the closed container by welding or shrink fitting, and it is not necessary to adjust the welding time and heat quantity, as well as local strain due to welding and strong compressive stress due to shrink fitting. It is possible to prevent the rotor from being distorted due to such factors and causing a decrease in the efficiency of the motor unit, and it is possible to obtain a high-performance compressor.

According to the above configuration, the present invention can provide a high-performance compressor by eliminating obstacles due to shrink-fitting fixing and welding fixing.

Longitudinal sectional view of the compressor according to the first embodiment of the present invention. A perspective view showing a stator of the electric motor portion of the compressor according to the first embodiment. An exploded perspective view showing a stator of the electric motor portion of the compressor according to the first embodiment. An exploded perspective view showing a stator of the electric motor portion of the compressor according to the second embodiment of the present invention. Sectional drawing which shows the motor part of the compressor in Embodiment 3 of this invention. Longitudinal section of a conventional compressor

The first invention is a compressor configured by accommodating a motor unit and a compression mechanism unit driven by the motor unit in a closed container, wherein the motor unit includes a stator and a rotor. On the outer peripheral surface of the stator, a plurality of concave grooves are formed to return the oil separated from the refrigerant to the lower part of the closed container, and the stator plate of the stator is a thin film-shaped plate of 0.1 mm or less. A pair of annular members to be fixed to a closed container are provided, one of which is formed with a pin shaft, and the other of which is formed with a hole into which the pin shaft is fitted. A plurality of the pin shafts are arranged in the plurality of concave grooves formed on the outer peripheral surface of the stator, and both ends of the stator are sandwiched between the annular members .

As a result, the motor does not need to fix the stator to the closed container by welding or shrink fitting, and it is not necessary to adjust the welding time and heat quantity, as well as local strain due to welding and strong compressive stress due to shrink fitting. It is possible to prevent the rotor from being distorted due to such factors and causing a decrease in the efficiency of the motor unit, and it is possible to obtain a high-performance compressor.

In the second invention, in the first invention, the outer diameter of the stator is smaller than the outer diameter of the annular member that sandwiches and fixes the stator.

As a result, the annular member receives the compressive stress in the radial direction caused by the thermal shrinkage of the closed container, and the compressive stress applied to the stator of the motor can be suppressed or eliminated, and the stator plate can be reduced to 0.1. It is possible to prevent stress damage even as a film-like thin plate made of nanocrystal material of millimeters or less, and it is possible to obtain a high-performance compressor that fully utilizes the performance efficiency of nanocrystal material.

According to the third aspect of the invention, in the first or second invention, the annular member is made of a material whose linear expansion coefficient is smaller than that of the closed container.

As a result, the compressive stress when the diameter of the closed container is reduced as the temperature drops can be received by the annular member, and the compressive stress applied to the stator of the motor can be suppressed or eliminated, improving the fixing quality of the stator. Can be done.

In the fourth aspect of the invention, in the first to third inventions, the annular member is provided with a detent portion for preventing the stator from rotating due to the torque generated by the stator.

As a result, it is possible to prevent the stator from rotating even if the stator of the motor is not fixed by shrink fitting or welding, and it is possible to suppress a decrease in efficiency and obtain a high-performance compressor.

In the fifth aspect of the invention, in the first to fourth inventions, the annular member is shrink-fitted and fixed to the closed container.

As a result, the heat effect from the annular member to the stator plate that occurs when the annular member is welded and fixed to the closed container can be reduced, and the high performance of the stator plate made of fragile nanocrystal material can be utilized without being reduced. It can be a higher performance compressor.

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 sectional view of a compressor according to an embodiment of the present invention.

2 is a perspective view showing the stator of the electric motor portion of the compressor according to the first embodiment, and FIG. 3 is an exploded perspective view showing the stator of the electric motor portion of the compressor according to the first embodiment. ..

The compressor of the present embodiment is configured by providing a motor unit 2 and a compression mechanism unit 3 in a closed container 1. The closed container 1 is composed of a cylindrical housing 5, an upper cover 6 for closing the opening of the housing 5, and a lower cover 7.

The compression mechanism portion 3 is arranged at the lower part of the housing 5. Further, the motor unit 2 is arranged on the compression mechanism unit 3 inside the housing 5, and is connected to the compression mechanism unit 3 by the drive shaft 4.

The upper cover 6 is provided with a terminal 8 for supplying electric power to the motor unit 2. An oil reservoir 9 for holding the lubricating oil is formed at the bottom of the closed container 1.

The motor unit 2 is composed of a stator 10 and a rotor 11. The rotor 11 is fixed to the drive shaft 4 and rotates together with the drive shaft 4. Both ends of the drive shaft 4 are rotatably supported by the upper bearing member 12 and the lower bearing member 13.

When the motor unit 2 is urged and the drive shaft 4 rotates, the drive shaft eccentric portion 14 of the drive shaft 4 rotates eccentrically in the cylinder 15, and the rolling piston 16 rotates while abutting on a vane (not shown). .. As a result, the suction and compression of the refrigerant gas are repeated. The compression mechanism portion 3 is composed of an upper bearing member 12, a lower bearing member 13, a cylinder 15, a rolling piston 16, and a vane (not shown).

A discharge pipe 17 is provided on the upper part of the closed container 1. The discharge pipe 17 penetrates the upper part of the upper cover 6 and opens toward the internal space of the closed container 1, and discharges the refrigerant gas compressed by the compression mechanism unit 3 to the outside of the closed container 1. It plays a role as a flow path. During operation of the compressor, the internal space of the closed container 1 is filled with the compressed refrigerant.

Further, a suction connection pipe 19 for supplying the refrigerant to the compression mechanism portion 3 is provided in the lower part of the closed container 1, and an accumulator 18 for separating the refrigerant gas into gas and liquid is connected to the suction connection pipe 19. The accumulator 18 is configured by connecting a refrigerant gas introduction pipe 20 at the upper part and a refrigerant gas outlet pipe connected to the suction connection pipe 19 at the lower part.

In the compressor configured as described above, the motor unit 2 forms the stator plate constituting the stator 10 with the nanocrystal material, and the thickness thereof is 0.1 mm or less, which is even thinner in the present embodiment. It is a sheet-like thin plate of about several tens of microns. As in the conventional case, a plurality of concave grooves 21 (see FIG. 2) for returning the oil separated from the refrigerant to the lower part of the closed container are formed on the outer peripheral surface of the stator 10.

Further, the electric motor portion 2 is provided with annular members 22a and 22b for sandwiching the stator 10 at both upper and lower ends of the stator 10, and the annular members 22a and 22b are shrink-fitted on the inner peripheral surface of the closed container 1. It is fixed by doing. That is, the stator 10 of the motor unit 2 is sandwiched and fixed by the upper and lower annular members 22a and 22b which are shrink-fitted and fixed to the closed container 1 without shrink-fitting or welding to the closed container 1. To fix the stator 10 to the closed container 1, in the present embodiment, the stator 10 is lightly pressed from above and below by the annular members 22a and 22b while the annular members 22a and 22b are baked into the closed container 1. It is fixed by shrinking.

Further, the stator 10 of the motor unit 2 has an outer diameter smaller than the outer diameter of the annular members 22a and 22b that sandwich and fix the stator 10. Further, in this embodiment, the annular members 22a and 22b are made of a material whose linear expansion coefficient is smaller than that of the closed container 1.

Further, the annular members 22a and 22b are fitted into the concave groove 21 on the outer periphery of the stator 10 in one of the annular members 22a to form a pin shaft 23 as a detent portion for preventing the rotor 11 from rotating. The other annular member 22b is provided with a hole 24 into which the pin shaft 23 is fitted.

The fixing of the annular members 22a and 22b to the closed container 1 is not limited to the shrink-fitting fixing, and may be fixed by welding with a laser or the like, or by lightly shrink-fitting and then welding. It is a thing.

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

As described above, in the compressor of the present embodiment, the stator 10 of the motor unit 2 is sandwiched and fixed by the annular members 22a and 22b fixed to the closed container 1, so that the stator 10 of the motor unit 2 is sealed. It does not receive the strong compressive stress that occurs when it is fixed to the container 1 by welding or shrink fitting.

Therefore, the stator 10 of the motor unit 2 is formed as a sheet-like thin plate having a thickness of 0.1 mm or less, and in the present embodiment, about several tens of microns, while forming the stator plate with a fragile nanocrystal material. However, it is possible to prevent the stator plate from being distorted and causing a decrease in the efficiency of the motor unit 2. Further, it is not necessary to adjust the laser irradiation time and the amount of heat by welding, and it is possible to prevent the efficiency from being lowered due to the variation in these adjustments.

From the above, it is possible to obtain a high-performance compressor.

In particular, in the compressor of the present embodiment, the stator plate of the stator 10 is formed of a nanocrystal material and is 0.1 mm or less, and in the present embodiment, it is a thinner sheet-like thin plate of about several tens of microns. It is possible to make full use of the efficiency improving effect of the nanocrystal material, and it is possible to obtain a high-performance compressor using a stator plate of the nanocrystal material which is not suitable for shrink-fitting fixing or welding.

Further, since the outer diameter of the stator 10 of the motor unit 2 is smaller than the outer diameter of the annular members 22a and 22b that sandwich and fix the stator 10, the diameter is reduced due to heat shrinkage of the closed container 1 or the like. The annular members 22a and 22b receive the compressive stress in the direction, and the compressive stress applied to the stator 10 of the motor unit 2 can be suppressed or eliminated.

Therefore, the stator plate of the stator 10 can be formed of nanocrystal material and can be prevented from being damaged by stress even if it is a film-like thin plate of 0.1 mm or less, and the performance efficiency of the nanocrystal material is fully utilized. It can be a high-performance compressor.

Further, since the annular members 22a and 22b are shrink-fitted and fixed to the closed container 1, the thermal influence from the annular members 22a and 22b generated when the annular members 22a and 22b are welded and fixed to the stator plate can be reduced. It is possible to make a compressor with higher performance by making the best use of it without reducing the high performance of the stator plate made of fragile nanocrystal material.

Further, since the annular members 22a and 22b are made of a material whose linear expansion coefficient is smaller than that of the closed container 1, the annular member 22a, The 22b can be received, and the compressive stress applied to the stator 10 of the motor unit 2 can be suppressed or eliminated, and the fixing quality of the stator 10 can be improved.

Further, since the pin shaft 23 provided on one of the annular members 22a of the compressor is fitted into the concave groove 21 on the outer periphery of the stator 10, the stator 10 of the motor portion 2 is fixed by shrink fitting, welding, or the like. Even if this is not done, the rotation of the stator 10 can be prevented, and a decrease in efficiency can be suppressed to obtain a high-performance compressor.

(Embodiment 2)
FIG. 4 is an exploded perspective view of the stator constituting the electric motor portion of the compressor according to the second embodiment.

The compressor of the present embodiment has a configuration in which a pin shaft insertion hole 25 is provided in the stator 10 of the motor unit 2, and the pin shaft 23 of the annular member 22a is inserted through the pin shaft insertion hole 25.

Other configurations (not shown) are the same as those in the first embodiment, and the same parts as those in the first embodiment are assigned the same numbers, and the description thereof will be omitted.

The compressor of the present embodiment configured as described above can obtain the same operation and effect as that of the first embodiment, but also obtain the following effects.

That is, in the present embodiment, since the pin shaft insertion hole 25 for preventing the stator 10 from rotating is formed in the stator 10, that is, the stator plate constituting the stator 10, the above rotation occurs when the stator plates are laminated. By inserting a pin jig into the pin shaft insertion hole 25 for preventing stopping, it is possible to prevent the stator plate from being misaligned, and it is possible to obtain a stator with high stacking quality.

(Embodiment 3)
FIG. 5 is a vertical sectional view showing an electric motor portion of the compressor according to the third embodiment.

The compressor of the present embodiment has a configuration in which at least one of the annular members is replaced by a step portion integrally formed on the inner peripheral surface of the closed container 1.

That is, an annular step portion 26 is integrally formed at the lower portion of the closed container 1, the lower end portion of the stator 10 of the motor portion 2 is placed on the step portion 26, and the annular member 22a is further placed on the upper end portion side of the stator 10. Is inserted and the stator 10 is lightly pressed against the step portion 26 and then shrink-fitted and fixed in the closed container 1.

The compressor of the present embodiment configured as described above can obtain the same operation and effect as that of the first embodiment, but also obtain the following effects.

That is, in the present embodiment, the stator 10 of the motor unit 2 is sandwiched and fixed by the stepped portion 26 provided on the inner peripheral surface of the closed container and the annular member 22a fixed to the inner peripheral surface of the closed container. One of the annular members to be fixed to the can be abolished, and the productivity and the production cost can be reduced.

The compressor according to the present invention has been described above using the above-described embodiment, but the present invention is not limited thereto.

For example, in the above embodiment, the compressor having a rotary compression mechanism has been described, but a compressor such as a scroll type, a reciprocating type, or a screw type may be used, and can be applied to compressors of various compression types. Further, in the above embodiment, the case where the inside of the closed container 1 is filled with the high temperature high pressure refrigerant gas has been described as an example, but the low pressure type compressor in which the inside of the closed container is filled with the low pressure refrigerant gas has been described as an example. It may be a machine.

That is, the embodiments disclosed this time are exemplary and not restrictive in all respects, and the scope of the present invention is indicated by the scope of claims and is equivalent to and within the scope of claims. All changes are included.

As described above, the present invention can provide a high-performance compressor by eliminating obstacles due to shrink-fitting fixing and welding fixing. Therefore, it can be used as a compressor for a refrigerating system of various devices such as an air conditioner, a refrigerator, a blower, and a water heater.

1 Airtight container 2 Motor part 3 Compression mechanism part 4 Drive shaft 5 Housing 6 Upper cover 7 Lower cover 8 Terminal 9 Oil pool 10 Rotor 11 Rotor 12 Upper bearing member 13 Lower bearing member 14 Drive shaft eccentric part 15 Cylinder 16 Rolling piston 17 Discharge pipe 18 Accumulator 19 Suction connection pipe 20 Refrigerator gas introduction pipe 21 Concave groove 22a, 22b Circular member 23 Pin shaft 24 hole 25 Pin shaft insertion hole 26 Steps

Claims (5)

A compressor in which a motor unit and a compression mechanism unit driven by the motor unit are housed in a closed container.
The motor unit consists of a stator and a rotor, and is composed of a stator and a rotor.
On the outer peripheral surface of the stator, a plurality of concave grooves are formed to return the oil separated from the refrigerant to the lower part of the closed container.
The stator plate of the stator shall be a film-like thin plate of 0.1 mm or less.
A pair of annular members fixed to the closed container
A pin shaft is formed on one of the annular members.
The other annular member is formed with a hole into which the pin shaft is fitted.
A compressor in which a plurality of pin shafts are arranged in a plurality of concave grooves formed on the outer peripheral surface of the stator, and both ends of the stator are sandwiched between the annular members . The compressor according to claim 1 , wherein the outer diameter of the stator is smaller than the outer diameter of the annular member that sandwiches and fixes the stator. The compressor according to claim 1 or 2 , wherein the annular member is made of a material whose linear expansion coefficient is smaller than that of the closed container. The compressor according to any one of claims 1 to 3 , wherein the annular member is provided with a detent portion for preventing the stator from rotating due to the torque generated by the stator. The compressor according to any one of claims 1 to 4 , wherein the annular member is shrink-fitted and fixed in the closed container.

Images