JP2020183726A - Rotary compressor - Google Patents

Abstract

To provide a rotary compressor capable of efficiently cooling a motor with a simple configuration.SOLUTION: A rotary compressor includes a bearing 17A having a cylindrical part 172 supporting a crankshaft 16, a muffler M covering a disk 171 from one side in an axis O direction and forming an opening Mh into which the cylindrical part is inserted with a gap g between an outer peripheral surface of the cylindrical part 172 and itself, and a guide member G provided in the one side relative to the muffler M in the cylindrical part 172 and guiding a refrigerant discharged from the muffler M through the gap g toward a radial outer side with respect to an axis O so as to blow the refrigerant to the motor 18.SELECTED DRAWING: Figure 2

Description

The present invention relates to a rotary compressor.

For example, a rotary compressor is known as a device used for compressing a refrigerant in an air conditioner. The rotary compressor is arranged on both sides of the shaft, a motor that applies a rotational force to the shaft, a piston rotor mounted on the eccentric portion of the shaft, a cylinder having a cylinder chamber for accommodating the piston rotor, and a cylinder chamber in the axial direction. It is provided with an upper bearing, a lower bearing, and a housing for accommodating them (see, for example, Patent Document 1 below).

The motor has a rotor that rotates integrally with the shaft, and a stator that has a tubular shape that covers the rotor from the outer peripheral side and generates a magnetic field by electric power supplied from the outside. The rotor is rotationally driven by the magnetic force generated by the stator. It is known that when the rotary compressor is continuously operated, the motor generates heat due to, for example, its own internal resistance. If the heat generation increases, the performance of the motor may be affected. Therefore, there is an increasing demand for a technology capable of efficiently cooling a motor.

Japanese Unexamined Patent Publication No. 2004-251133

However, it has been considered difficult to provide a configuration exclusively for cooling the motor inside the rotary compressor due to space and cost constraints.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotary compressor having a simpler configuration and a configuration capable of efficiently cooling a motor. To do.

The rotary compressor according to one aspect of the present invention includes a crankshaft that can rotate around an axis, and a compression unit in which a compression chamber for compressing the refrigerant is formed as the crankshaft rotates. A motor for rotationally driving the crankshaft, a piston rotor provided on the crankshaft that swivels around the axis at a position eccentric from the axis, and an annular cylinder that covers the piston rotor from the outer peripheral side. By covering each of the cylinders from the axis direction, the crankshaft can be rotated by forming a disk portion forming the compression chamber together with the cylinder and a tubular shape provided in the disk portion and centered on the axis. An opening through which the tubular portion is inserted while covering the disk portion from one side in the axial direction and leaving a gap between the bearing having the tubular portion supporting the cylinder and the outer peripheral surface of the tubular portion. By providing the muffler on which the portion is formed and the refrigerant in the tubular portion on one side in the axial direction from the muffler and guiding the refrigerant discharged from the muffler through the gap toward the outer side in the radial direction with respect to the axis. It has a guide member for blowing the refrigerant onto the motor.

According to the above configuration, the high-pressure refrigerant discharged from the opening of the muffler is guided outward in the radial direction by a guide member provided in the tubular portion of the bearing. As a result, the refrigerant is sprayed onto the motor, so that the motor can be cooled by the refrigerant. In particular, it is possible to obtain a configuration capable of efficiently cooling the motor only by providing the guide member on the bearing. As a result, it is possible to suppress an increase in manufacturing cost while avoiding space restrictions inside the rotary compressor.

In the rotary compressor, the motor has a rotor integrally provided on the crankshaft and a tubular stator that covers the rotor from the outer peripheral side, and the stator has the guide member from the outer peripheral side. The end portion of the stator on the other side in the axial direction may be located on the other side in the axial direction with respect to the outer peripheral edge of the guide member.

According to the above configuration, the end portion of the stator is located on the other side in the axial direction from the edge on the outer peripheral side of the guide member. Further, the stator covers the guide member from the outer peripheral side. As a result, the refrigerant guided by the guide member is sprayed onto the stator from the inner peripheral side. As a result, the stator can be cooled efficiently. In particular, the stator is more likely to generate heat than the rotor. According to the above configuration, the cooling efficiency can be improved by positively cooling such a member that easily generates heat.

In the rotary compressor, the guide member may be gradually curved from the inside to the outside in the radial direction with respect to the axis from the other side to the one side in the axial direction.

According to the above configuration, the guide member is gradually curved from the inner side to the outer side in the radial direction from the other side in the axial direction toward one side. As a result, the flow of the refrigerant can be guided more smoothly. On the other hand, for example, in a configuration in which the guide member extends in a plane or is bent, efficient cooling may not be realized because the flow of the refrigerant is obstructed. According to the above configuration, such a possibility can be reduced.

In the rotary compressor, the muffler may be formed with a muffler injection port provided at a position where the refrigerant in the muffler can be sprayed on the motor.

According to the above configuration, the muffler injection port is formed in the muffler. In particular, the muffler injection port is formed at a position where the refrigerant is sprayed onto the motor. As a result, the motor can be cooled by the refrigerant discharged from the muffler injection port in addition to the refrigerant discharged through the opening of the muffler described above. As a result, the motor can be cooled more efficiently.

In the rotary compressor, the muffler may be formed with a plurality of muffler injection ports arranged at intervals in the circumferential direction.

According to the above configuration, the muffler is formed with a plurality of muffler injection ports at intervals in the circumferential direction. As a result, the motor can be uniformly cooled over the entire circumferential direction.

The rotary compressor according to one aspect of the present invention includes a crankshaft that can rotate around an axis, and a compression unit in which a compression chamber for compressing a refrigerant is formed as the crankshaft rotates. A motor for rotationally driving the crankshaft, a piston rotor provided on the crankshaft that swivels around the axis at a position eccentric from the axis, and an annular cylinder that covers the piston rotor from the outer peripheral side. By covering the cylinders from the axial direction, the crankshaft can be rotated by forming a disk portion forming the compression chamber together with the cylinder and a tubular shape provided in the disk portion centered on the axis. An opening through which the tubular portion is inserted while covering the disk portion from one side in the axial direction and leaving a gap between the bearing having the tubular portion supporting the cylinder and the outer peripheral surface of the tubular portion. The muffler has a muffler having a portion formed therein, and the muffler is provided with a muffler injection port provided at a position where the refrigerant in the muffler can be sprayed onto the motor.

According to the above configuration, the muffler injection port is formed in the muffler. In particular, the muffler injection port is formed at a position where the refrigerant is sprayed onto the motor. As a result, the motor can be cooled by the refrigerant discharged from the muffler injection port in addition to the refrigerant discharged through the opening of the muffler described above. As a result, the motor can be cooled more efficiently.

According to the present invention, it is possible to provide a rotary compressor having a simpler configuration and a configuration capable of efficiently cooling a motor.

It is a vertical sectional view which shows the structure of the rotary compressor which concerns on embodiment of this invention. It is an enlarged sectional view of the main part of the rotary compressor which concerns on embodiment of this invention. It is an arrow view at line III-III of FIG.

An embodiment of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the rotary compressor 100 according to the present embodiment includes an accumulator 24, suction pipes 26A and 26B, and a compressor main body 10. The compressor body 10 includes a crankshaft 16 extending along the axis O, a motor 18 for rotating the crankshaft 16, a compression unit 10A for compressing a refrigerant as the crankshaft 16 rotates, a crankshaft 16, and a motor 18. And a housing 11 that covers the compression portion 10A.

The compression unit 10A includes piston rotors 13A and 13B (first piston rotor 13A, second piston rotor 13B) that rotate (rotate) at a position eccentric from the axis O as the crankshaft 16 rotates, and these first piston rotors. The cylinders 12A and 12B accommodating the 13A and the second piston rotor 13B, respectively, the upper bearing 17A and the lower bearing 17B rotatably supporting the crankshaft 16, and the compression chamber C formed in the cylinders 12A and 12B are provided. It has a blade B that separates into two spaces, a muffler M that guides a high-pressure refrigerant discharged from the compression chamber C, and a guide member G.

The compression unit 10A is a so-called two-cylinder type rotary compressor in which disc-shaped cylinders 12A and 12B are provided in two upper and lower stages in a cylindrical housing 11. The housing 11 surrounds the cylinders 12A and 12B to form a discharge space V from which the compressed refrigerant is discharged. Inside the cylinders 12A and 12B, a cylindrical first piston rotor 13A and a second piston rotor 13B having an outer shape smaller than the inside of the inner wall surface of the cylinder are arranged, respectively. The first piston rotor 13A and the second piston rotor 13B are inserted and fixed to the crankshafts 14A and 14B (first crankshaft 14A, second crankshaft 14B) of the crankshaft 16, respectively.

The first piston rotor 13A of the cylinder 12A on the upper stage side and the second piston rotor 13B on the lower stage side are provided so that their phases differ from each other by 180 °. That is, the first piston rotor 13A is eccentric in the direction opposite to the eccentric direction of the second piston rotor 13B. Further, a disc-shaped partition plate 15 is provided between the upper and lower cylinders 12A and 12B. The space R in the cylinder 12A on the upper stage side and the space R on the lower stage side are partitioned from each other by the partition plate 15 to form compression chambers C1 and C2, respectively.

The cylinders 12A and 12B are fixed to the housing 11 by the upper bearing 17A and the lower bearing 17B. More specifically, the upper bearing 17A has a disk shape fixed to the upper part of the compression portion 10A, and its outer peripheral surface is fixed to the inner peripheral surface of the housing 11. The lower bearing 17B has a disk shape fixed to the lower part of the compression portion 10A, and its outer peripheral surface is fixed to the inner peripheral surface of the housing 11. The upper bearing 17A covers the cylinder 12A on the upper stage side from above (one side in the axis O direction). Further, the lower bearing 17B covers the lower cylinder 12B from below (the other side in the axis O direction). That is, the upper bearing 17A forms the above-mentioned compression chamber C1 together with the cylinder 12A and the partition plate 15, and the lower bearing 17B forms the above-mentioned compression chamber C2 together with the cylinder 12B and the partition plate 15. The rotary compressor 100 may have one cylinder instead of such two cylinders. In the case of one cylinder, the upper bearing 17A and the lower bearing 17B respectively cover both sides of the cylinder in the O-direction without providing the partition plate 15.

In the compressor main body 10, an accumulator 24 for gas-liquid separation of the refrigerant prior to supply to the compressor main body 10 is fixed to the housing 11 via a stay 25. Suction pipes 26A and 26B for sucking the refrigerant in the accumulator 24 into the compressor main body 10 are provided between the accumulator 24 and the compressor main body 10. One end of the suction pipes 26A and 26B is connected to the lower part of the accumulator 24, and the other end communicates with the suction ports 23A and 23B formed in the cylinders 12A and 12B through the openings 22A and 22B, respectively. A rotor 19A of a motor 18 for rotationally driving the crankshaft 16 is integrally provided on one end side of the crankshaft 16. A stator 19B is fixedly provided on the inner peripheral surface of the housing 11 so as to face the outer peripheral portion of the rotor 19A. The rotor 19A is rotationally driven around the axis O by receiving a force generated by a magnetic field generated by the stator 19B.

Subsequently, the configuration around the upper bearing 17A will be described with reference to FIG. As shown in FIG. 2, the upper bearing 17A includes a disk-shaped disk portion 171 centered on the axis O and a cylindrical tubular portion 172 provided integrally with the disk portion 171 and centered on the axis O. ,have. The disk portion 171 covers the cylinder 12A from one side (upper side) in the axis O direction. That is, the disk portion 171 forms an inner surface on one side (upper side) of the axis O direction in the compression chamber C1. The tubular portion 172 is open in the axis O direction, and the crankshaft 16 is inserted inside the tubular portion 172. That is, the tubular portion 172 rotatably supports the crankshaft 16 around the axis O.

Further, a muffler M is attached to the disk portion 171. The muffler M is provided to reduce the flow velocity of the high-pressure refrigerant discharged from the compression chamber C and diffuse it over a wide area in the housing 11. Specifically, the muffler M has a cup shape that covers the disk portion 171 from one side in the axis O direction. That is, the muffler M is formed so as to extend from the outer peripheral side edge of the disk portion 171 toward one side in the axis O direction and gradually decrease in the radial dimension in the cross-sectional view including the axis O. As a result, a muffler space Vm through which the high-pressure refrigerant discharged from the compression chamber C flows is formed between the muffler M and the disk portion 171.

An opening Mh through which the above-mentioned tubular portion 172 is inserted is formed in the central portion of the muffler M. The opening Mh has a diameter larger than the outer diameter of the tubular portion 172. That is, an annular gap g centered on the axis O is formed between the end edge of the opening Mh and the outer peripheral surface of the tubular portion 172. The high-pressure refrigerant discharged from the compression chamber C flows toward one side (upper side) of the axis O direction through this gap g.

A guide member G is provided on one side of the tubular portion 172 in the direction of the axis O with respect to the muffler M. The guide member G is provided to guide the refrigerant flowing from the gap g along the outer peripheral surface of the tubular portion 172 toward the outside in the radial direction. Specifically, the guide member G protrudes from the outer peripheral surface of the tubular portion 172 in the cross-sectional view including the axis O, and gradually gradually goes from the other side in the axis O direction to one side (from the lower side to the upper side). It is curved from the inside to the outside in the radial direction. The guide member G is covered from the outer peripheral side by the above-mentioned stator 19B. That is, the guide member G has a diameter dimension that fits on the inner peripheral side of the stator 19B.

Further, the end 19t on the other side of the stator 19B in the axis O direction is located on the other side in the axis O direction with respect to the edge Gt on the outer peripheral side of the guide member G. In other words, at least a part of the guide member G and the stator 19B overlap each other in the axis O direction. Therefore, the flow of the refrigerant flowing out from the gap g is guided by the guide member G and is sprayed onto the stator 19B from the inner peripheral side.

The muffler injection port Mj is formed in the muffler M at a position where the refrigerant can be directly sprayed on the stator 19B. The muffler injection port Mj is formed slightly inside the stator 19B in the radial direction and outside the opening Mh. A plurality of muffler injection ports Mj are arranged at intervals in the circumferential direction about the axis O. The high-pressure refrigerant injected from the muffler injection port Mj is sprayed onto the stator 19B together with the components of the refrigerant guided by the guide member G described above.

Next, the operation of the rotary compressor 100 according to the present embodiment will be described. When operating the rotary compressor 100, the motor 18 is first driven by an external power supply. As the motor 18 is driven, the crankshaft 16 rotates around the axis O. As the crankshaft 16 rotates, the first crankshaft 14A and the second crankshaft 14B rotate around the central axis (axis O) of the crankshaft 16. The first piston rotor 13A and the second piston rotor 13B rotate eccentrically in the compression chambers C1 and C2 so as to follow this turning. The eccentric rotation of the first piston rotor 13A and the second piston rotor 13B changes the volumes of the compression chambers C1 and C2, and the refrigerant taken into the compression chambers C1 and C2 is compressed. The compressed refrigerant is taken out to the outside through the muffler space Vm and the discharge space V in the housing 11.

Here, it is known that when the rotary compressor 100 is continuously operated, the motor 18 generates heat due to, for example, its own internal resistance. If the heat generation is increased, the performance of the motor 18 may be affected. Therefore, there is an increasing demand for a technique capable of efficiently cooling the motor 18.

Therefore, in the present embodiment, as described above, the refrigerant discharged from the muffler space Vm is guided by the guide member G to be sprayed on the stator 19B of the motor 18. Further, the refrigerant in the muffler space Vm is directly blown to the stator 19B through the muffler injection port Mj.

As described above, according to the configuration according to the present embodiment, the high-pressure refrigerant discharged from the opening Mh of the muffler M is directed outward in the radial direction by the guide member G provided in the tubular portion 172 of the upper bearing 17A. Will be guided. As a result, the refrigerant is sprayed onto the motor 18 (stator 19B), so that the motor 18 can be cooled by the refrigerant. In particular, it is possible to obtain a configuration capable of efficiently cooling the motor 18 only by providing the guide member G on the upper bearing 17A. As a result, it is possible to suppress an increase in manufacturing cost while avoiding space restrictions inside the rotary compressor 100.

Further, according to the above configuration, the end portion 19t of the stator 19B is located on the other side in the axis O direction with respect to the edge Gt on the outer peripheral side of the guide member G. Further, the stator 19B covers the guide member G from the outer peripheral side. As a result, the refrigerant guided by the guide member G is sprayed onto the stator 19B from the inner peripheral side. As a result, the stator 19B can be efficiently cooled. In particular, the stator 19B is more likely to generate heat than the rotor 19A. According to the above configuration, the cooling efficiency can be improved by positively cooling such a member that easily generates heat.

In addition, according to the above configuration, the guide member G is gradually curved from the inside to the outside in the radial direction from the other side to the one side in the axis O direction. As a result, the flow of the refrigerant can be guided more smoothly. On the other hand, for example, in a configuration in which the guide member G extends in a plane or is bent, there is a possibility that efficient cooling cannot be realized because the flow of the refrigerant is obstructed. According to the above configuration, such a possibility can be reduced.

Further, according to the above configuration, the muffler injection port Mj is formed in the muffler M. In particular, the muffler injection port Mj is formed at a position where the refrigerant is sprayed onto the motor 18. As a result, the motor 18 can be cooled by the refrigerant discharged from the muffler injection port Mj in addition to the refrigerant discharged through the opening Mh of the muffler M described above. As a result, the motor 18 can be cooled more efficiently.

Further, according to the above configuration, the muffler M is formed with a plurality of muffler injection ports Mj at intervals in the circumferential direction. As a result, the motor 18 can be uniformly cooled over the entire circumferential direction.

The embodiment of the present invention has been described above. It should be noted that various changes and modifications can be made to the above configuration as long as the gist of the present invention is not deviated. For example, it is possible to adopt a configuration in which only one of the guide member G and the muffler injection port Mj in the above embodiment is provided.

100 ... Rotary compressor 10 ... Compressor body 10A ... Compressor 11 ... Housing 12A, 12B ... Cylinder 13A ... First piston rotor 13B ... Second piston rotor 14A ...・ ・ First crankshaft 14B ・ ・ ・ Second crankshaft 16 ・ ・ ・ Crankshaft 17A ・ ・ ・ Upper bearing 171 ・ ・ ・ Disk part 172 ・ ・ ・ Cylindrical part 17B ・ ・ ・ Lower bearing 18 ・ ・ ・ Motor 19A ... Rotor 19B ... Stator 19t ... Stator ends 22A, 22B ... Openings 23A, 23B ... Suction port 24 ... Accumulator 25 ... Stays 26A, 26B ... Suction Tube B ... Blade Bt ... Tip C, C1, C2 ... Compressor chamber G ... Guide member Gt ... Edge edge g of guide member ... Gap Mh ... Opening Mj ...・ Muffler injection port V ・ ・ ・ Discharge space Vm ・ ・ ・ Muffler space

Claims (6)

A crankshaft that can rotate around the axis and
A compression unit in which a compression chamber for compressing the refrigerant with the rotation of the crankshaft is formed, and
With
The compression unit is
A motor that rotationally drives the crankshaft and
A piston rotor provided on the crankshaft and swiveling around the axis at a position eccentric from the axis.
An annular cylinder that covers the piston rotor from the outer peripheral side,
By covering each of the cylinders from the direction of the axis, the crankshaft can be rotated by forming a disk portion forming the compression chamber together with the cylinder and a tubular shape provided in the disk portion centered on the axis. A bearing with a tubular part that supports the
A muffler that covers the disk portion from one side in the axial direction and has an opening through which the tubular portion is inserted with a gap between the disk portion and the outer peripheral surface of the tubular portion.
A guide provided on one side of the tubular portion in the axial direction with respect to the muffler, and guiding the refrigerant discharged from the muffler through the gap toward the outside in the radial direction with respect to the axis to blow the refrigerant onto the motor. Members and
Rotary compressor with. The motor
A rotor integrally provided with the crankshaft and
A tubular stator that covers the rotor from the outer peripheral side,
Have,
The stator covers the guide member from the outer peripheral side, and the end portion of the stator on the other side in the axial direction is located on the other side in the axial direction with respect to the edge on the outer peripheral side of the guide member. The rotary compressor described in. The rotary compressor according to claim 1 or 2, wherein the guide member is gradually curved from the inside to the outside in the radial direction with respect to the axis from the other side to the one side in the axial direction. The rotary compressor according to any one of claims 1 to 3, wherein the muffler is formed with a muffler injection port provided at a position where the refrigerant in the muffler can be sprayed onto the motor. .. The rotary compressor according to claim 4, wherein the muffler is formed with a plurality of muffler injection ports arranged at intervals in the circumferential direction. A crankshaft that can rotate around the axis and
A compression unit in which a compression chamber for compressing the refrigerant with the rotation of the crankshaft is formed, and
With
The compression unit is
A motor that rotationally drives the crankshaft and
A piston rotor provided on the crankshaft and swiveling around the axis at a position eccentric from the axis.
An annular cylinder that covers the piston rotor from the outer peripheral side,
By covering each of the cylinders from the direction of the axis, the crankshaft can be rotated by forming a disk portion forming the compression chamber together with the cylinder and a tubular shape provided in the disk portion centered on the axis. A bearing with a tubular part that supports the
A muffler that covers the disk portion from one side in the axial direction and has an opening through which the tubular portion is inserted with a gap between the disk portion and the outer peripheral surface of the tubular portion.
Have,
A rotary compressor in which a muffler injection port provided at a position where the refrigerant in the muffler can be sprayed onto the motor is formed on the muffler.

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