WO2018189768A1

WO2018189768A1 - Pressure feeder and refrigeration cycle device equipped with pressure feeder

Info

Publication number: WO2018189768A1
Application number: PCT/JP2017/014621
Authority: WO
Inventors: 増本　浩二; 加藤　啓介; 裕貴田村
Original assignee: 三菱電機株式会社
Priority date: 2017-04-10
Filing date: 2017-04-10
Publication date: 2018-10-18

Abstract

Conventional compressors have the problem that a foreign object contained in a fluid compressed by a compression mechanism part may flow into the inside of an electric motor part, damaging the winding wound around, for example, a stator and causing failure of the electric motor part. The purpose of the present invention is to obtain a pressure feeder capable of preventing a foreign object from flowing inside the electric motor part. According to the pressure feeder of the present invention, a notch is provided in the outer circumferential surface of a rotor and the closest end of the notch to the main axis is positioned so as to be in a region shifted from the region surrounded by an end of the notch in the outer circumferential surface and an axis of rotation of a main shaft. In this way, the inside surface of the notch prevents a foreign object that has entered into the notch provided in the outer circumferential surface of the rotor from moving out again in the centrifugal direction, thereby preventing the foreign object from continuing to flow inside the electric motor part and enabling a reduction in failure of the electric motor part.

Description

Refrigeration cycle apparatus equipped with a pressure feeder and a pressure feeder

The present invention relates to a pressure feeder that pumps a fluid using a driving force of an electric motor, and a refrigeration cycle apparatus using the pressure feeder.

Examples of the pressure feeder that pumps fluid include a compressor that compresses a refrigerant to increase the pressure and a pump that transfers air and liquid. Some of these pressure feeders are provided with a pressure feeding portion and an electric motor portion inside a container that sucks and discharges fluid, and the rotational force generated in the electric motor portion is transmitted to the pressure feeding portion, and the pressure feeding is performed by this rotational force. The part is driven and pressure is applied to the fluid to feed it. As this pumping unit, for example, a compressor is provided with a compression mechanism unit that compresses fluid, and a pump is provided with a pumping mechanism unit including an impeller. And the electric motor part which gives rotational force to these pumping parts has the rotor connected to the pumping part via the rotating shaft, and the stator which covers the outer periphery of this rotor, and a rotor by electromagnetic force Is what rotates.

As such a conventional pressure feeder, for example, there was a compressor as shown in Patent Document 1. In this compressor, when the fluid that has flowed into the container is compressed by the compressor mechanism, the compressed fluid flows through the inside of the electric motor unit housed in the same container and is discharged out of the container.

JP 2005-299635 A

In the conventional compressor as described above, foreign matter contained in the fluid compressed by the compression mechanism section, for example, minute wear powder generated inside the compressor, dust mixed in during manufacture, etc. For example, a gap formed between the rotor and the stator or the like, so that if this foreign matter winds the rotor or stator or the stator, the winding is damaged. As a result, there was a problem that the motor part could be damaged.

The present invention has been made in order to solve the above-described problems, and an object of the present invention is to obtain a compressor capable of suppressing the flow of foreign matter inside the electric motor section.

In the present invention, a notch is provided on the outer peripheral surface of the rotor, and the tip closest to the main shaft of the notch is located in a region shifted from the region surrounded by the end portion of the outer surface of the notch and the rotation shaft of the main shaft. It is what you do.

According to the electric motor of the present invention, the tip of the notch is located in a region shifted from the region surrounded by the end portion of the outer periphery of the notch and the rotation axis of the main shaft. The foreign matter that has entered the provided notch is prevented from coming out again in the centrifugal direction by the inner surface of the notch. For this reason, it is suppressed that a foreign material continues flowing through the inside of an electric motor part, and the failure of an electric motor part can be reduced.

Sectional drawing which shows schematic structure of the compressor 100 which concerns on Embodiment 1-5. AA sectional view of the compression mechanism in FIG. Sectional drawing of the electric motor part which concerns on Embodiment 1. FIG. Side view of rotor according to embodiment 1 Side view of rotor according to embodiment 1 Side view of rotor according to embodiment 1 Side view of rotor according to embodiment 1 Sectional drawing of the electric motor part which concerns on Embodiment 2. FIG. Sectional drawing of the electric motor part which concerns on Embodiment 3. Sectional drawing of the electric motor part which concerns on Embodiment 4. FIG. Sectional drawing of the electric motor part which concerns on Embodiment 5. FIG.

Embodiment 1 FIG.
Hereinafter, a compressor which is an embodiment of a pressure feeder of the present invention will be described. The compressor is used in a refrigeration cycle or the like and compresses a refrigerant that is a fluid. The compressor according to the first embodiment includes an IPM (Interior Permanent Magnet) motor having a compression mechanism unit as a pumping unit and a permanent magnet as an electric motor unit. FIG. 1 is a cross-sectional view illustrating a schematic configuration of a compressor 100 according to the first embodiment.

The compressor 100 includes a cylindrical container 10, a motor unit 30 that is provided inside the container 10 and generates a rotational force, and a rotational force is transmitted through the main shaft 24 of the motor unit 30 that is also provided in the container 10. The compression mechanism unit 20 is provided.
A suction pipe 11 having a suction port 12 through which refrigerant is sucked is provided below the container 10, and a discharge pipe 13 having a discharge port 14 through which refrigerant is discharged is provided on the upper surface of the container 10. . An oil sump 15 for storing lubricating oil is formed below the suction pipe 11 in the container 10.

Next, a detailed configuration of the compression mechanism unit 20 will be described. 2 is a cross-sectional view taken along line AA of the compression mechanism 20 in FIG. As shown in FIGS. 1 and 2, the compression mechanism section 20 includes a cylinder 21, an eccentric section 23, a main shaft 24, a roller 22, a vane 25, a spring 26, an upper bearing section 28, and a lower bearing section. 29.
The cylinder 21 has a space into which refrigerant flows. The space inside the cylinder 21 and the suction pipe 11 of the container 10 are connected via a flow path through which a refrigerant flows to form a suction chamber.

A main shaft 24 is provided in the compression space of the cylinder 21, and an eccentric portion 23 is connected to the main shaft 24. A roller 22 is provided between the eccentric portion 23 and the cylinder 21, and a compression chamber 60 for compressing the refrigerant is formed between the cylinder 21 and the roller 22.
Further, a vane 25 having a tip disposed in contact with the roller 22 is provided inside the cylinder 21, and the vane 25 and the cylinder 21 are connected by a spring 26. A space between the cylinder 21 and the roller 22 is divided into two by a vane 25.

An upper bearing portion 28 provided with a discharge hole 27 is provided above the cylinder 21, and a lower bearing portion 29 is provided below the cylinder 21. The position of the main shaft 24 is fixed by being disposed through the upper bearing portion 28 and the lower bearing portion 29.

Next, a detailed configuration of the electric motor unit 30 will be described. 3 is a cross-sectional view taken along the line BB of the motor unit 30 in FIG. 1, and FIG. 4 is a side view of the rotor 50. As shown in FIG. The electric motor unit 30 includes a rotor 50 having a main shaft 24 that transmits rotational force to the compression mechanism unit 20, and a stator 40 that surrounds the outer peripheral surface of the rotor 50, and above the compression mechanism unit 20 inside the container 10. Has been placed.

The stator 40 includes an annular stator core portion 41 and a winding 46 wound around the stator core portion 41. The stator core portion 41 is formed by laminating electromagnetic steel plates in the main axis direction, and includes an annular back yoke portion 42 and a plurality of teeth portions 43 protruding from the back yoke portion 42 toward the inner peripheral surface side. A space called a slot portion 44 is formed between the back yoke portion 42 and the tooth portion 43. A winding 46 is wound around the tooth portion 43, and the winding 46 is accommodated in the slot portion 44.
A slot opening 45 that is an opening of the slot portion 44 is formed at the tip of the adjacent teeth portion 43. The slot opening 45 is used for an opening for winding the winding 46 at the time of manufacture, or provided to be a magnetic resistance.

In addition, a conductive terminal 47 is electrically connected to the stator 40. The conductive terminal 47 is provided above the container 10.

The rotor 50 includes a main shaft 24, a rotor core portion 51, and a permanent magnet 56, the outer peripheral surface is surrounded by the stator 40, and the main shaft 24 is supported by the upper bearing portion 28 and the lower bearing portion 29. It is arrange | positioned in the container 10 by being supported. A gap called an air gap is formed between the stator 40 and the rotor 50. The main shaft 24 and the rotor core portion 51 are fixed, and the rotor 50 is connected to the compression mechanism portion 20 via the main shaft 24. Six rotor permanent magnets 56 are inserted into the rotor core 51 in the axial direction of the main shaft 24 so as to surround the main shaft 24 from six directions.

A notch 52 is provided on the outer peripheral surface of the rotor core 51. As shown in FIG. 4, the notch 52 is formed continuously from the upper part to the lower part of the rotor 50. The notch 52 has

end portions

53 a and 53 b on the outer peripheral surface, a tip 54, and an inner side surface 55 of the notch 52. Here, the

end portions

53a and 53b are portions that form the openings of the notches 52 on the outer peripheral surface of the rotor core portion 51. In the example of FIG. It has been. The inner side surface 55 is two surfaces forming the inside of the notch 52, and is curved and formed in an arc shape in the cross section in the rotation axis direction. The tip 54 is a portion of the inner surface 55 that forms the notch 52 that is closest to the main shaft 24.

The inner side surface 55 on the main shaft 24 side of the inner side surface 55 is shaped to return further to the outer peripheral side from the tip end 54, and the tip end 54 closest to the main shaft 24 is located in the middle of the arc forming the inner side surface 55. It will be. That is, the tip 54 is located between the

end portions

53a and 53b of the inner side surface 55 and the end portion to which the two inner side surfaces 55 are connected. The tip 54 is located in a region shifted from a region surrounded by the

end portions

53 a and 53 b and the rotation shaft 70 of the main shaft 24. The region surrounded by the

end portions

53a and 53b and the rotation shaft 70 of the main shaft 24 is a plane 71 connecting the straight line constituting the end portion 53a and the rotation shaft 70 of the main shaft 24 and the straight line forming the end portion 53b. And a plane 72 formed by connecting the rotation shaft 70 of the main shaft 24 and a plane 73 formed by connecting the

end portions

53a and 53b. In the cross-sectional view of FIG. 3, the planes 71 to 73 are indicated by dotted lines. Note that the rotation direction of the rotor 50 of this embodiment is clockwise in FIG. 3, and the rotation direction starts from the region where the tip 54 is displaced from the region surrounded by the

end portions

53a and 53b and the rotation shaft 70 of the main shaft 24. It is located in the area shifted to the rear side.

Next, the operation of the compressor 100 will be described.
When electric power is supplied from the conductive terminal 47 of the compressor 100 and a predetermined voltage is applied to the winding of the stator 40, a magnetic field is generated around the winding 46, and the stator core portion 41 becomes an electromagnet. When the magnetic flux generated in the stator 40 and the magnetic flux generated by the permanent magnet 56 provided in the rotor 50 are repelled or attracted, the rotor 50 rotates with a rotational force. The rotor 50 rotates clockwise in FIG. When the rotor 50 rotates, the main shaft 24 of the rotor 50 rotates, and the eccentric portion 23 connected to the main shaft 24 also rotates. Along with the rotation of the eccentric portion 23, the roller 22 of the compression mechanism portion 20 rotates eccentrically inside the cylinder 21. Since the vane 25 is in contact with the roller 22 and swings in the radial direction of the compression chamber, the volume of the compression chamber 60 divided into two changes as the eccentric portion 23 rotates eccentrically.

When the compressor 100 starts operating in this manner, the refrigerant is sucked from the suction port 12 and flows into the compression chamber 60 inside the compression mechanism unit 20. The refrigerant that has flowed in is compressed in the compression chamber 60 by the rotation of the rotor 50, and changes into a high-pressure gas refrigerant. The compressed gas refrigerant is discharged from the discharge hole 27 of the compression mechanism 20 into the space inside the container 10. Further, the gas refrigerant discharged from the discharge hole 27 passes through the outside of the electric motor unit 30, the slot 44, the air gap, or the like and is discharged out of the compressor 100 from the discharge port 14 provided above the container 10. The

Further, during the operation of the compressor 100, the lubricating oil flows along with the refrigerant inside the compressor 100. When the stator 40 rotates, the lubricating oil stored in the oil reservoir 15 is sucked up from an oil hole provided in the main shaft 24. As a suction method, there are a method using a pressure difference, a method using a gear, a method using a centrifugal force, and the like. The sucked-up lubricating oil passes through a predetermined oil passage and is used for lubrication for suppressing wear due to sliding of the upper bearing portion 28 and the lower bearing portion 29, or the airtightness of the compression chamber of the compression mechanism portion 20 is increased. Used to raise. The lubricating oil supplied to each part cools the upper bearing part 28 and the lower bearing part 29 and returns to the oil sump 15 again. A part of the sucked lubricating oil is discharged into the container 10 and passes through the outside of the electric motor unit 30, the slot unit 44, the air gap or the like together with the compressed refrigerant.

As described above, a fluid containing a compressed refrigerant and lubricating oil flows inside the compressor 100. One of the reasons for flowing the compressed refrigerant around or inside the electric motor unit 30 in the compressor 100 is to cool the electric motor unit 30 that generates heat during the operation of the compressor 100 with the refrigerant. For this purpose, it is necessary to bring the refrigerant into contact with the electric motor unit 30. In addition, the lubricating oil that has been heated to a high temperature by cooling the upper bearing portion 28 and the lower bearing portion 29 is cooled by coming into contact with the refrigerant flowing in the compressor 100 and returns to the oil reservoir 15 again. Thus, in the compressor 100, the fluid containing the compressed refrigerant and lubricating oil is configured to flow around or inside the electric motor unit 30.

The refrigerant or the lubricating oil flowing inside the compressor 100 contains foreign particles such as fine abrasion powder generated inside the compressor and dust mixed during manufacturing. The compressor is made of a material that is a magnetic material such as iron, and the material is shaved and worn at the sliding portion. Therefore, the foreign matter includes both a magnetic material and a non-magnetic material. Therefore, when the refrigerant and the lubricating oil flow inside the compressor 100, the foreign matter may flow into the air gap formed between the stator 40 and the rotor 50 together with the fluid.

In the conventional electric motor, fluid containing foreign matter flows into the air gap, and this foreign matter damages the rotor 50 or the stator 40 or the winding 46 provided on the stator 40, which may cause a failure of the motor unit 30. It was. When the rotor 50 is rotating, the fluid flows through the air gap. Therefore, the foreign matter contained in the fluid or the foreign matter attached to the outer peripheral surface of the rotor 50 receives the centrifugal force and is blown toward the stator 40. Since the teeth portion 43 and the like are provided on the surface side of the stator 40 facing the rotor 50 and have a complicated structure, when foreign matter enters from the slot open 45, the foreign matter accumulates inside the stator 40. start.

Since a voltage is applied to the winding 46 of the stator 40, a potential difference is generated between the winding 46 and the stator core portion 41. If the wound 46 is damaged by the accumulated foreign matter, the winding 46 and the stator core portion 41 come into contact with each other, and thus a discharge phenomenon or a spark occurs, causing the motor portion 30 to fail. .

In the compressor 100 according to Embodiment 1 of the present invention compared to such a conventional compressor, when a fluid containing foreign matter flows through the air gap, the foreign matter is notched 52 provided on the outer peripheral surface of the rotor 50. Get in. In particular, the foreign matter having magnetism is attracted toward the outer peripheral surface of the rotor 50 by a magnetic force received from a permanent magnet 56 provided on the rotor 50. The attracted foreign matter of the magnetic body is attracted into the notch 52 provided at a position closer to the permanent magnet 56 than the outer peripheral surface. The foreign matter that has entered the notch 52 is collected at the tip 54 of the notch 52.

When the rotor 50 is rotating at a constant speed, centrifugal force is applied to the collected foreign matter, so that it is blown in the centrifugal direction. Since the tip 54 of the notch 52 is located in a region deviated from the region surrounded by the

end portions

53a and 53b and the rotation shaft 70 of the main shaft 24 on the outer peripheral surface of the notch 52, the foreign matter blown in the centrifugal direction is The state of colliding with the inner surface 55 of the notch 52 and being collected inside the notch 52 is maintained.

According to the compressor 100 according to the first embodiment as described above, since the notch 52 is provided on the outer peripheral surface of the rotor 50, the foreign matter flowing through the air gap can be taken into the notch 52. . Further, since the tip of the notch 52 is located in a region deviated from the region surrounded by the

end portions

53 a and 53 b and the rotation shaft 70 of the main shaft 24 on the outer peripheral surface of the notch 52, the outer peripheral surface of the rotor 50. The inside surface 55 of the notch 52 prevents the foreign matter that has entered the notch 52 provided in the bottom of the notch 52 from coming out of the opening of the notch 52 in the centrifugal direction again. For this reason, it is possible to reliably collect the foreign matter that has entered the notch 52, and to prevent the foreign matter from continuing to flow inside the electric motor unit 30, and to prevent a failure of the electric motor unit 30.

Further, since the rotor 50 includes the permanent magnet 56, magnetic foreign matter is collected inside the notch 52 provided closer to the permanent magnet 56 than the outer peripheral surface of the rotor 50 by the magnetic force of the permanent magnet 56. can do. Since the collected foreign matter of the magnetic material is attracted by the magnetic force in the direction in which the permanent magnet 56 is disposed, it is suppressed from coming out of the notch 52 again, and the foreign matter can be reliably collected inside the notch 52. .

In addition, the rotor 50 is provided with a notch 52, and the magnetic substance of the permanent magnet 56 provided for the rotating operation of the electric motor unit 30 can be used to attract magnetic foreign matter, thereby increasing the number of parts. Therefore, it is possible to reliably collect the foreign matter without causing the foreign matter to continue flowing in the electric motor unit 30.

Further, since foreign matter is collected in the notch 52 provided in the rotor 50, foreign matter can be prevented from entering through the slot opening 45 of the stator 40 and depositing foreign matter inside the stator 40.

In FIG. 3, the tip 54 is located in a region shifted from the region surrounded by the

end portions

53 a and 53 b and the rotation shaft 70 of the main shaft 24 to the rear side in the direction in which the rotor 50 rotates. However, the present invention is not limited to this, and may be located in a region shifted forward in the rotational direction.

When the tip 54 is located in a region shifted to the rear side in the rotation direction, it is possible to suppress foreign matters from coming out of the notch 52 again when the rotation speed of the rotor 50 is increased. For example, when the compressor 100 is driven from a stopped state, the rotor 50 increases the rotation speed from the stopped state until reaching a certain number of rotations. At this time, the foreign matter collected in the notch 52 of the rotor 50 moves in the notch 52 in the opposite direction to the rotation direction of the rotor 50 due to inertia and does not move in the same direction as the rotation direction. Stay inside the notch 52.
Further, when the tip 54 is located in a region shifted to the rear side in the rotational direction as in the first embodiment, foreign matter is put inside the notch 52 when the rotational speed of the rotor 50 is increased. Easy to collect. When the rotation speed of the rotor 50 is increasing, the speed of the fluid flowing through the air gap is smaller than the rotation speed of the rotor 50, so that foreign matter contained in the fluid is behind the rotor 50 in the rotation direction. Flows to the side. Therefore, the foreign matter can be easily taken into the notch 52 located in the region shifted to the rear side in the rotation direction.

On the other hand, when the tip 54 is located in a region shifted forward in the rotational direction, foreign matter can be easily collected inside the notch 52 when the rotational speed of the rotor 50 is decreasing. . When the rotational speed of the rotor 50 is decreasing, the speed of the fluid flowing through the air gap is larger than the rotational speed of the rotor 50, so that the foreign matter contained in the fluid is forward of the rotational direction with respect to the rotor 50. Flows to the side. Therefore, it can collect easily in the notch 52 located in the area | region which shifted | deviated to the front side of the rotation direction.

In the first embodiment, the notch 52 is linearly formed in the vertical direction from the upper part to the lower part of the rotor 50. However, the notch 52 is provided on the outer peripheral surface of the rotor 50. Then, the shape which the

edge parts

53a and 53b form in the outer peripheral surface of the rotor 50 is not restricted to this. For example, the widths of the openings formed by the

end portions

53a and 53b on the outer peripheral surface are different between the upper part and the lower part of the rotor 50, as shown in FIG. The formed structure is intermittently formed from the upper part to the lower part of the rotor 50 as shown in FIG. 6, and is a staggered structure in which notches 52 are provided at positions shifted in the direction of the rotating shaft 70, FIG. As described above, the

end portions

53a and 53b on the outer peripheral surface of the notch 53 may be formed in a circular shape. Further, the number of the notches 52 is not limited, and an appropriate number may be provided.

Further, in the rotor 50 of the first embodiment, as shown in FIG. 8, the central axis that is an intermediate line between the end portion 53 a and the end portion 53 b in each notch 52 is the central axis 74 of each permanent magnet 56. The notch 52 is provided so that it may become a position facing. The central axis 74 of the permanent magnet 56 is an axis passing through the center in the longitudinal direction of the permanent magnet 56 in the cross-sectional view of the electric motor unit 30 shown in FIG.

With such an arrangement, the influence of the notch 52 on the magnetic flux generated by the permanent magnet 56 can be reduced. When the center axis of the end portion 53a and the end portion 53b of the notch 52 is a position facing the center axis 74 of the permanent magnet 56, the center axis of the end portion 53a and the end portion 53b is the center axis 74 of the permanent magnet 56. And it will be located on the plane 75 which connects the rotating shaft 70 of the main axis | shaft 24.
In the rotor 50 of the compressor 100, one permanent magnet 56 is inserted so that the outer peripheral surface side of the rotor 50 and the main shaft 24 side are different poles. Further, the six permanent magnets 56 are arranged so that the directions of the S pole and the N pole between the adjacent permanent magnets 56 are opposite to each other. Therefore, a magnetic flux is generated from the north pole of one permanent magnet 56 toward the south pole of the adjacent permanent magnet 56. This magnetic flux has a small magnetic flux density in the vicinity of the central axis 74 of one permanent magnet 56 and a large magnetic flux density between adjacent permanent magnets 56. When the notch 52 is provided in the region through which such a magnetic flux passes, the magnetic permeability changes in the portion where the notch 52 is provided, so that the magnetic flux changes.

As described above, when the center axis of the end portion 53 a and the end portion 53 b of the notch 52 is provided on the plane 75 connecting the center axis 74 of the permanent magnet 56 and the rotation shaft 70 of the main shaft 24, the notch 52 is provided. Is located in a region where the magnetic flux density is small, and therefore has little influence on the magnetic flux. Therefore, even when the notch 52 is provided, the disturbance of the magnetic flux can be reduced, and the influence on the rotating operation of the rotor 50 can be suppressed.
As shown in FIG. 8, when the notches 52 are evenly arranged on the outer peripheral surface of the rotor 50, the shape of the magnetic flux generated from each permanent magnet 56 has symmetry about the rotation axis 70 of the main shaft 24. Therefore, since the rotor 50 stably rotates, the generation of vibration or noise in the motor unit 30 can be suppressed. Further, in a state where foreign matter enters the notches 52, the amount of foreign matter entering each notch 52 is made uniform, so that the rotor 50 can be stably rotated without losing the balance of the weight of the entire rotor 50. Therefore, generation of vibration or noise can be suppressed.

Although the center axis of the end portion 53a and the end portion 53b of the notch 52 has been described on the plane 75 connecting the center shaft 74 of the permanent magnet 56 and the rotation shaft 70 of the main shaft 24, it is strictly described. Such a positional relationship is not necessary, and the same effect can be obtained if the opening formed by the end portion 53a and the end portion 53b of the notch 52 is provided on the plane 75.
In FIG. 8, the same number of the notches 52 as the permanent magnets 56 are provided, but the present invention is not limited to this. The number may be smaller than the number of permanent magnets 56. In this case, when the number of permanent magnets 56 is set to be half of the number of permanent magnets and every other one, the weight balance is good. Further, the number may be larger than the number of permanent magnets 56. In this case, if the number is an integral multiple of the number of permanent magnets 56, the balance is good.

Embodiment 2. FIG.
In the first embodiment, the description has been given of the case where the center axis of the end portion 53a and the end portion 53b of the notch 52 is located at the position facing the center axis 74 of the permanent magnet 56. However, in the second embodiment, the notch 52 is provided. The compressor 100 having a configuration in which the center axis of the end portion 53a and the end portion 53b is located at a position facing the intermediate point 76 of the adjacent permanent magnet 56 will be described.
FIG. 9 is a BB cross-sectional view of electric motor unit 30 in compressor 100 according to the second embodiment. In the second embodiment, the difference from the first embodiment will be mainly described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

The outer surface of the rotor 50 is provided with six notches 52 that are the same number as the permanent magnets 56. Further, the notch 52 is positioned so that the central axis of the end portion 53a and the end portion 53b of the notch 52 is positioned on a plane 77 connecting the intermediate point 76 of the adjacent permanent magnet 56 and the rotation shaft 70 of the main shaft 24. Is provided. That is, the notch 52 is provided in a region where the magnetic flux density is high.

In the compressor 100 according to the second embodiment as described above, the central axes of the end 53a and the end 53b of the notch 52 are the intermediate point 76 of the adjacent permanent magnet 56 and the rotation shaft 70 of the main shaft 24. Since it is on the flat surface 77 formed by tying, the magnetic force acting in the vicinity of the notch 52 is increased, and the action of attracting or holding the magnetic foreign matter in the notch 52 is enhanced.
Note that the same number of notches 52 as the permanent magnets 56 are provided, but the present invention is not limited to this.

Embodiment 3 FIG.
In the first embodiment, the compressor 100 having the rotor 50 in which the number of the notches 52 is the same as the number of the permanent magnets 56 has been described. However, in the third embodiment, the number of slot openings 45 of the stator 40 is increased. A description will be given of the compressor 100 in which the rotor 50 is provided with the integral number of notches 52.
FIG. 10 is a BB cross-sectional view of electric motor unit 30 in compressor 100 according to the third embodiment. In the third embodiment, the difference from the first embodiment will be mainly described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

The stator 40 has nine slot openings 45. On the outer peripheral surface of the rotor 50, nine notches 52, which are the same number as the slot openings 45, are provided.

The cause of vibration or noise generated when the motor unit 30 is driven is a groove high-frequency electromagnetic force generated by the influence of a groove such as the slot open 45 of the stator 40 or the notch 52 of the rotor 50. Since the vibration frequency of the stator 40 and the rotor 50 changes according to the frequency of the groove high-frequency electromagnetic force, vibration or noise increases due to resonance when the vibration frequency matches the natural frequency of the components constituting the motor unit 30. There is a case. In order to suppress such vibration or noise due to resonance, by selecting a combination of the number of grooves of the stator 40 and the rotor 50, the vibration frequency of the stator 40 and the rotor 50, the natural frequency of the component, Must be designed so that they do not match.

When the stator 40 and the rotor 50 are provided with grooves such as the slot open 45 or the notch 52, noise having a frequency corresponding to the number of grooves provided in each of the stator 40 and the rotor 50 is generated. Therefore, the noise having a frequency obtained by multiplying the rotational speed by the number of grooves provided in the stator 40 or an integral multiple thereof, and the noise having a frequency obtained by multiplying the rotational speed by the number of grooves provided in the rotor 50 or an integral multiple thereof. Will occur.
For example, in the motor unit 30 described in the first embodiment, the stator 40 is provided with nine slot openings 45, and the rotor 50 is provided with six notches 52. When the rotor 50 is rotating at a rotation speed of 100 rps, noise such as 900 Hz, 1800 Hz, 2700 Hz, or the like is generated by the groove of the stator 40 by multiplying 9 or an integer multiple of 9 to the rotation speed of 100 rps. Further, the groove of the rotor 50 generates noise such as a frequency obtained by multiplying 6 or an integer multiple of 6 to a rotational speed of 100 rps, 600 Hz, 1200 Hz, 1800 Hz, and the like. Accordingly, the entire motor unit 30 generates noise having a frequency corresponding to the number of grooves provided in the stator 40 and noise having a frequency corresponding to the number of grooves provided in the stator 40.

In the compressor 100 according to the third embodiment, the number of notches 52 that is an integral multiple of the number of slot openings 45 provided in the stator 40 is provided in the stator 40 and the rotor 50. Since the number of grooves is the same, the frequency range of the generated noise can be reduced. Since the frequency of the noise is proportional to an integer multiple of the number of notches 52 or slot openings 45, the same effect can be obtained if the number of notches 52 is an integer multiple of the number of slot openings 45.

Embodiment 4 FIG.
In the first embodiment, the width of the opening in the notch 52 and the width of the slot opening 45 in the stator 40 are not defined, but in the fourth embodiment, the width of the opening in the notch 52 is the width of the slot opening 45. A compressor 100 having a larger size will be described.
FIG. 11 is a BB cross-sectional view of electric motor unit 30 in compressor 100 according to the fifth embodiment. In the fourth embodiment, the difference from the first embodiment will be mainly described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

Suppose that the width of the opening formed by the

end portions

53a and 53b in the notch 52 is M, and the width of the slot opening 45 in the stator 40 is L. In the compressor 100 according to the fourth embodiment, the width M of the opening in the notch 52 is configured to be larger than the width L of the slot opening 45. Therefore, the relationship of M> L is established.

In the compressor 100 according to the fourth embodiment, since the opening of the notch 52 provided in the rotor 50 is larger than the width of the slot opening 45 provided in the stator 40, the foreign matter flowing through the air gap is fixed. An attraction force larger than the attraction force received from the electromagnet of the child 40 is received from the permanent magnet 56 provided on the rotor 50. The foreign matter having magnetism can be attracted to the notch 52 of the rotor 50 having a greater attraction force than the stator 40 side and can enter the notch 52.
Further, foreign matter that has entered the slot opening 45 may be attracted by the permanent magnet 56 of the rotor 50 and jump out of the slot opening 45 and enter the notch 52 of the rotor 50. Therefore, it is possible to reliably collect foreign matter inside the notch 52 of the rotor 50 and reduce foreign matter that enters the stator 40.
Further, since the foreign matter enters the groove more easily as the width of the opening in the groove becomes larger, the foreign material enters more in the notch 52 having a larger opening width than in the slot opening 45 having a smaller opening width. Can be collected.
Further, when a foreign object having a width larger than the width of the slot opening 45 flows, the foreign object enters the notch 52 having a width larger than the width of the slot opening 45, so that the foreign object having a large width can be collected. .

In the above first to fourth embodiments, the compressor 100 including the notch 52 on the outer peripheral surface of the rotor 50 has been described. Such a compressor 100 can be used for the refrigeration cycle apparatus 200.

The refrigeration cycle apparatus 200 used in an air conditioner or a refrigerator is provided with a compressor 100. The refrigeration cycle apparatus 200 performs heat exchange of air using heat absorption due to evaporation of refrigerant flowing through the refrigerant circuit and heat dissipation due to condensation. In the refrigeration cycle apparatus 200 according to the sixth embodiment, the compressor 100 including the notch 52 is provided on the outer peripheral surface of the rotor 50.
In the refrigeration cycle apparatus 200, moisture is mixed when installed, or the refrigerant circuit deteriorates due to a large temperature change of the refrigerant in the refrigerant circuit, so that rust and lubricating oil are precipitated in the refrigeration cycle apparatus 200. Sludge may be generated. In addition, there may be foreign matters mixed in the refrigeration cycle apparatus 200 during manufacturing.

Therefore, by using the compressor 100 of the present invention for the refrigeration cycle apparatus 200, foreign matters flowing inside the refrigeration cycle apparatus can be reduced. That is, in the compressor 100 of the present invention, the compressor 100 having the notch 52 on the outer peripheral surface of the rotor 50 is provided, so that foreign matters flowing inside the compressor 100 are collected in the notch 52 of the rotor 50. It is possible to reduce foreign matters flowing inside the refrigeration cycle apparatus 200. The failure of the refrigeration cycle apparatus 200 can be suppressed by reducing foreign matters flowing inside the refrigeration cycle apparatus 200.

In the first to fourth embodiments, the electric motor unit 30 having the inner surface 55 having the arc-shaped cutout 52 has been described. However, the present invention is not limited to this, and the tip 54 of the cutout 52 is the outer periphery of the cutout 52. The shape of the inner surface 55 may be, for example, a curved surface other than an arc or a combination of planes as long as the inner surface 55 is located in a region shifted from the region surrounded by the

end portions

53a and 53b and the rotation shaft 70 of the main shaft 24.
Moreover, although the electric motor part 30 shall rotate by the permanent magnet 56 provided in the inside of the rotor 50, and the electromagnet generated by the coil | winding 46 of the stator 40, it is the structure which the electric motor part 30 can rotate. There may be a configuration in which the winding 46 is provided inside the rotor 50.
The compressor 100 is a rotary compressor, but it may be a scroll type or a reciprocating type.
Moreover, although the compressor 100 provided with the electric motor part 30 was described as the pumping machine of the present invention, the pumping machine to which the present invention is applied is not limited to the described compressor, and has a function of feeding fluid by pressure, such as a pump. It can be used for a pressure feeder having a configuration in which an electric motor is provided inside a container through which a fluid flows.
In addition, the type of refrigerant used in the electric motor unit 30 is not limited, but when a refrigerant with a low global warming potential GWP (Global Warming Potential) such as HFO1234yf is used, compared to a refrigerant with a high GWP. When the winding 46 is wound around the rotor 50 or the stator 40 or the stator 40, the winding 46 is likely to be damaged, resulting in a failure of the motor unit 30. An effect can be obtained. When a refrigerant with a low GWP is used, the rotational speed of the rotor 50 is faster than when a refrigerant with a high GWP is used, so that the stator 40 or the rotor 50 is often damaged by foreign matter passing through the air gap. Since the foreign matter of the stator 40 is likely to enter, failure of the electric motor unit 30 is likely to occur. Therefore, when the refrigerant having a low GWP is used, the effect of suppressing the failure of the electric motor unit 30 can be sufficiently achieved by using the compressor 100 according to the present invention.

The pumping machine according to the present invention can be widely used as an air conditioner for home use or business use.

10 container, 11 suction pipe, 12 suction port, 13 discharge pipe, 14 discharge port, 15 oil sump, 20 compression mechanism part, 21 cylinder, 22 roller, 23 eccentric part, 24 spindle, 25 vane, 26 spring, 27 discharge hole 28 Upper bearing part, 29 Lower bearing part, 30 Motor part, 40 Stator, 41 Stator core part, 42 Back yoke part, 43 Teeth part, 44 Slot part, 45 slot open, 46 winding, 47 Conductive terminal , 50 rotor, 51 rotor core, 52 notch, 53a, 53b end, 54 tip, 55 inner surface, 56 permanent magnet, 60 compression chamber, 70 rotation shaft, 71, 72, 73, 75, 77 plane 74 center axis, 76 midpoint, 100 compressor, 200 refrigeration cycle equipment

Claims

A container having a suction port through which fluid is sucked and a discharge port through which fluid is discharged;
A pumping unit that is provided inside the container and pumps the fluid sucked from the suction port into the container;
A rotor provided inside the container and having a main shaft for transmitting a rotational force to the pumping unit, and a motor unit having a stator surrounding an outer peripheral surface of the rotor,
The outer peripheral surface of the rotor is provided with a notch, and the tip closest to the main shaft of the notch is displaced from the region surrounded by the end portion of the outer surface of the notch and the rotation shaft of the main shaft. Pumping machine characterized in that it is located in the area.
A permanent magnet inserted in the axial direction of the main shaft inside the rotor,
2. The pressure feeder according to claim 1, wherein the notch is provided at a position where a central axis of the two end portions on the outer peripheral surface faces a central axis of the permanent magnet.
A permanent magnet inserted in the axial direction of the main shaft inside the rotor,
2. The pressure feeder according to claim 1, wherein the notch is provided at a position where a central axis of the two end portions on the outer peripheral surface faces an intermediate point between the adjacent permanent magnets.
The stator is provided with a groove on a surface facing the rotor,
4. The notch according to claim 1, wherein the number of the cutouts is the same as the number of the grooves provided in the stator on the outer peripheral surface of the rotor. 5. Pumping machine.
The stator is provided with a groove on a surface facing the rotor,
The pressure feeder according to any one of claims 1 to 3, wherein a width of the notch is larger than a width of the groove provided in the stator.
The tip of the notch closest to the main shaft is located in a region shifted to the rear side in the direction in which the rotor rotates from a region surrounded by an end portion of the outer periphery of the notch and the rotation shaft of the main shaft. The pressure feeder according to any one of claims 1 to 5, wherein the pressure feeder is provided.
The front end of the notch closest to the main shaft is located in a region shifted forward from the region surrounded by the end portion of the outer periphery of the notch and the rotation shaft of the main shaft in the direction in which the rotor rotates. The pressure feeder according to any one of claims 1 to 5, wherein the pressure feeder is provided.
The notch includes an inner surface that forms the inside of the notch,
The pressure feeder according to any one of claims 1 to 7, wherein the inner surface is formed to be curved in a cross section in the direction of the rotation shaft.
The pressure feeder according to claim 8, wherein a tip of the notch closest to the main shaft is located in the middle of the inner surface.
The pumping device according to any one of claims 1 to 9, wherein an end of the notch on the outer peripheral surface is continuously formed from an upper part to a lower part of the rotor.
The pumping machine according to claim 10, wherein an end portion of the notch on the outer peripheral surface is formed linearly in an oblique direction continuously from the upper part to the lower part of the rotor.
10. The pressure feeder according to claim 1, wherein an end portion of the notch on the outer peripheral surface is intermittently formed from an upper part to a lower part of the rotor.
The pumping machine according to claim 12, wherein an end portion of the notch on the outer peripheral surface is formed at a position shifted in the direction of the rotating shaft.
The pressure feeder according to any one of claims 12 and 13, wherein an end portion of the notch on the outer peripheral surface is formed in a circular shape.
A refrigeration cycle apparatus comprising the pressure feeder according to any one of claims 1 to 14.