JP6509541B2 - Compressor and motor - Google Patents

Description

  The present invention relates to a compressor and a motor used for the compressor.

An air conditioner (for example, an air conditioner or a cooler), a cooling device, a freezer, and the like are compressors for compressing a working medium (generally called "refrigerant") for transferring heat energy. Have. A compressor used in such an apparatus usually includes a compression mechanism and a motor disposed in a closed container (referred to as a "closed compressor"). Further, as the compressor, for example, a compressor having various structures such as a rotary type compressor having a rotary type compression mechanism section and a scroll type compressor having a scroll type compression mechanism section is used.
Conventionally, for example, a compressor 400 as shown in FIG. The compressor 400 includes a closed container 410, a compression mechanism 420 disposed in the closed container 410, an electric motor 430, and the like. The compressor 400 shown in FIG. 6 is configured as a scroll-type compressor having a scroll-type compression mechanism unit 420.
A compression mechanism 420 is disposed above the motor 430 along the vertical direction (vertical arrangement). Further, a discharge port 412 is provided above the compression mechanism 420, and an oil reservoir 429 is provided below the motor 430. The oil reservoir 429 stores lubricating oil supplied to the bearings 424 and 425 of the rotary shaft 461, the sliding portion of the compression mechanism 420, and the like.
The motor 430 has a stator 440 and a rotor 460. A stator passage 470 is formed along the axial direction (the extending direction of the rotation shaft 461) between the outer peripheral surface of the stator core 450 constituting the stator 440 and the inner peripheral surface of the sealed container 410. . Further, a rotor passage 480 is formed in the rotor core 462 constituting the rotor 460 along the axial direction.
The working medium sucked through the suction port 411 is compressed by the compression mechanism 420, and then the discharge chamber 427a, the first communication hole 420a, the rotor passage 480, the stator passage 470, and the second communication hole 420b. Through the discharge port 412.
Here, a part of the lubricating oil supplied to the bearing etc. is scattered as oil droplets. Then, when the working medium compressed by the compression mechanism 420 comes in contact with the oil drops, the working medium captures the oil drops. For this reason, the working medium mixed with the lubricating oil is discharged from the discharge port 412. When the lubricating oil is discharged from the discharge port 412 together with the working medium, the lubricating oil stored in the oil reservoir 429 is reduced, which may cause oil shortage.
In the conventional compressor, by passing the working medium compressed by the compression mechanism 420 through the rotor passage 480 and the stator passage 470, the lubricating oil mixed in the working medium is separated, and the oil reservoir 429 is generated by gravity or the like. Collected. Thus, the amount of lubricating oil mixed into the working medium discharged from the discharge port 412 can be reduced.
An air gap 431 formed between the inner peripheral surface of the stator core 450 and the outer peripheral surface of the rotor core 462 also functions as a passage for the working medium.

JP 2001-280252 A

In the conventional compressor, an axially extending stator passage and a rotor passage are formed between the outer peripheral surface of the stator and the inner peripheral surface of the hermetic container and in the rotor. Then, by passing the working medium compressed by the compression mechanism portion through the stator passage and the rotor passage, the lubricating oil mixed in the working medium is separated and collected in the oil reservoir.
However, in the conventional compressor, since the passage areas of the stator passage and the rotor passage are constant, the lubricating oil mixed in the working medium can not be sufficiently separated.
The present invention has been made in view of these points, and it is an object of the present invention to provide a technique capable of reducing the amount of lubricating oil mixed in the working medium discharged from the discharge port.

The present invention is configured as follows.
The first invention relates to a compressor.
The compressor according to the present invention includes a container, a compression mechanism provided in the container for compressing a working medium, and an electric motor for driving the compression mechanism. The container is typically configured as a closed container.
The motor has a stator and a rotor rotatable relative to the stator. The motor includes various structures such as a permanent magnet motor including a rotor provided with a permanent magnet (for example, a magnet embedded motor including a rotor having a permanent magnet inserted in a magnet insertion hole), an induction motor, etc. A motor can be used. The motor is disposed below the compression mechanism along the vertical direction.
As the compression mechanism portion, compression mechanism portions of various configurations can be used, but typically, a scroll-type compression mechanism portion is used.
The rotary shaft of the motor and the rotary shaft of the compression mechanism may be integrally formed or separately formed and coupled.
Further, the motor includes a rotor passage formed along the axial direction so as to connect the compression mechanism side and the opposite side to the compression mechanism side to the rotor core forming the rotor, and a stator forming a stator. Between the outer peripheral surface of the daughter core and the inner peripheral surface of the container, there is provided a stator passage formed along the axial direction so as to communicate the compression mechanism side and the opposite side of the compression mechanism. The description “axial direction” indicates the direction (extension direction) in which the rotation axis constituting the rotor extends in a state where the rotor is rotatably supported relative to the stator. .
In the present invention, the working medium compressed by the compression mechanism moves one of the rotor passage and the stator passage from the compression mechanism side to the opposite side of the compression mechanism, and the rotor passage and the stator The other one of the passages is configured to be moved from the side opposite to the compression mechanism portion to the compression mechanism side. Furthermore, one passage is formed such that the passage area of the passage portion opposite to the compression mechanism portion is larger than the passage area of the passage portion on the compression mechanism portion side, and the other passage is a passage portion on the compression mechanism portion side Is formed to be larger than the passage area of the passage portion opposite to the compression mechanism portion. The passage area is an area of a cross section which intersects (typically, is orthogonal (including “substantially orthogonal”)) the extending direction of the passage. Preferably, a guide member is provided for guiding the working medium compressed by the compression mechanism to one of the passages.
In the present invention, one of the rotor passage and the stator passage is formed such that the passage area of the passage portion opposite to the compression mechanism portion is larger than the passage area of the passage portion on the compression mechanism portion side, The other of the rotor passage and the stator passage is formed such that the passage area of the passage portion on the compression mechanism side is larger than the passage area of the passage portion on the opposite side to the compression mechanism. Thus, when the working medium moves from one side of the passage from the compression mechanism side to the side opposite to the compression mechanism, and when the other moves from the side opposite to the compression mechanism to the compression mechanism side, the passage area The movement speed of the working medium decreases due to the increase of. As the moving speed of the working medium decreases, small particles of lubricating oil mixed in the working medium combine with one another to form large particles. When the small particles of lubricating oil mixed in the working medium become large particles, they drop by gravity. Thereby, the lubricant oil mixed in the working medium can be effectively separated by the rotor passage and the stator passage, and the amount of the lubricant mixed in the working medium discharged from the discharge port is reduced. Can.
In a different form of the first aspect of the invention, one passage is disposed on the first passage portion having the first passage area, and on the side opposite to the compression mechanism portion with respect to the first passage portion. A second passageway portion having a second passageway area greater than the first passageway area. The other passage is a first passage portion having a first passage area, and a second passage portion disposed on the compression mechanism side with respect to the first passage portion, the second passage being larger than the first passage area of the first passage portion. And a second passage portion having a passage area of
In another different form of the first invention, one passage is a rotor passage. The passage wall forming the rotor passage is disposed opposite to the compression mechanism portion with respect to the first passage wall forming the first passage portion having the first passage area, and the first passage wall, A second passage wall forming a second passage portion having a second passage area larger than the first passage area, and a connecting wall connecting the first passage wall and the second passage wall . The other passage is a stator passage. The outer peripheral surface of the stator core forming the stator passage is disposed closer to the compression mechanism portion than the first outer peripheral wall forming the first passage portion having the first passage area and the first outer peripheral wall A second outer peripheral wall forming a second passage portion having a second passage area larger than the first passage area, and a connecting wall connecting the first outer peripheral wall and the second outer peripheral wall ing.
The rotor passage is formed in a step-like shape by the first passage portion and the second passage portion. The connecting wall is preferably formed to be orthogonal (including “substantially orthogonal”) to the extending direction of the first passage wall. The connecting wall may be formed in a step-like (step-like) or inclined manner. The passage walls forming the rotor passage may be constituted by three or more passage walls and two or more connecting walls connecting the passage walls.
In addition, the stator passage is formed in a step-like shape (step-like shape) by the first passage portion and the second passage portion. The connection wall is preferably formed to be orthogonal (including “substantially orthogonal”) to the extending direction of the first outer peripheral wall. The connecting wall may be formed in a step-like (step-like) or inclined manner. The outer peripheral wall forming the stator passage can also be configured by three or more outer peripheral walls and two or more connection walls connecting each outer peripheral wall.
In this embodiment, the working medium in which the lubricating oil is mixed moves the rotor passage from the compression mechanism side to the opposite side to the compression mechanism, and the stator passage from the opposite side to the compression mechanism to the compression mechanism side When passing through, lubricating oil mixed in the working medium can be efficiently separated.
In another different form of the first invention, one passage is a stator passage. The outer peripheral surface of the stator core forming the stator passage is a first outer peripheral wall forming a first passage portion having a first passage area, and a side opposite to the compression mechanism portion with respect to the first outer peripheral wall And a connecting wall connecting the first outer peripheral wall and the second outer peripheral wall, the second outer peripheral wall forming a second channel portion having a second channel area larger than the first channel area. It is configured. Also, the other passage is a rotor passage. The passage wall forming the rotor passage is disposed opposite to the compression mechanism portion with respect to the first passage wall forming the first passage portion having the first passage area, and the first passage wall, A second passage wall forming a second passage portion having a second passage area larger than the first passage area, and a connecting wall connecting the first passage wall and the second passage wall .
The stator passage is formed in a step-like shape by the first passage portion and the second passage portion. The connection wall is preferably formed to be orthogonal (including “substantially orthogonal”) to the extending direction of the first outer peripheral wall. The connecting wall may be formed in a step-like (step-like) or inclined manner. The outer peripheral wall forming the stator passage can also be configured by three or more outer peripheral walls and two or more connection walls connecting each outer peripheral wall.
Further, the rotor passage is formed in a step-like shape (stepwise shape) by the first passage portion and the second passage portion. The connecting wall is preferably formed to be orthogonal (including “substantially orthogonal”) to the extending direction of the first passage wall. The connecting wall may be formed in a step-like (step-like) or inclined manner. The passage walls forming the rotor passage may be constituted by three or more passage walls and two or more connecting walls connecting the passage walls.
In this embodiment, the working medium in which the lubricating oil is mixed moves the stator passage from the compression mechanism side to the opposite side of the compression mechanism, and the rotor passage from the opposite side to the compression mechanism to the compression mechanism side When passing through, lubricating oil mixed in the working medium can be efficiently separated.

The second invention. The present invention relates to a motor used in a compressor.
The electric motor according to the present invention comprises a container, a stator provided in the container and a rotor rotatable relative to the stator, and a rotor core constituting the rotor on one side along the axial direction. And the rotor passage formed along the axial direction so as to communicate the other side along the axial direction, and the axial direction between the outer peripheral surface of the stator core constituting the stator and the inner peripheral surface of the container And a stator passage formed along an axial direction so as to communicate the one side along with the other side along the axial direction. The container is typically configured as a closed container. “One side along the axial direction” and “the other side along the axial direction” indicate, for example, the compression mechanism side of the motor and the side opposite to the compression mechanism of the motor, respectively.
The motor according to the present invention includes various motors such as a permanent magnet motor including a rotor provided with permanent magnets (for example, a magnet embedded motor including a rotor having permanent magnets inserted in magnet insertion holes) and an induction motor. It can be configured as a motor of construction.
In the present invention, the working medium moves from one side along the axial direction from the one side of the rotor passage and the stator passage to the other side along the axial direction, and the working medium The second passage is configured to move from the other side along the axial direction to one side along the axial direction. Furthermore, one passage is formed such that the passage area of the other passage portion along the axial direction is larger than the passage area of the one passage portion along the axial direction, and the other passage is in the axial direction The passage area of the passage portion on one side is made larger than the passage area of the passage portion on the other side along the axial direction.
In the present invention, in the case where the compression mechanism is disposed on one side along the axial direction of the motor, the working medium is typically along the axial direction from one side along the one passage. When moving to the other side and moving the other passage from the other side along the axial direction to one side along the axial direction, the moving area of the working medium is reduced by the increase of the passage area. As the moving speed of the working medium decreases, small particles of lubricating oil mixed in the working medium combine with one another to form large particles. When the small particles of lubricating oil mixed in the working medium become large particles, they drop by gravity. Thereby, the lubricating oil mixed in the working medium can be effectively separated by the rotor passage and the stator passage .
In a different form of the second invention, one passage is disposed on the other side along the axial direction from the first passage portion having the first passage area and the first passage portion, and the first passage portion And a second passage portion having a second passage area greater than the first passage area. Further, the other passage is disposed on the first passage portion having the first passage area, and on one side axially along the first passage portion, and the first passage portion of the first passage portion is It is constituted by a second passage part having a large second passage area.
In the present embodiment, in the case where the compression mechanism is disposed on one side along the axial direction of the motor, the working medium is typically along the axial direction from one side along the one passage. When moving to the other side and moving the other passage from the other side along the axial direction to one side along the axial direction, the moving area of the working medium is reduced by the increase of the passage area. As the moving speed of the working medium decreases, small particles of lubricating oil mixed in the working medium combine with one another to form large particles. Thereby, the lubricating oil mixed in the working medium can be effectively separated by the rotor passage and the stator passage .

  By using the compressor and motor of the present invention, the amount of lubricating oil mixed in the working medium discharged from the discharge port can be reduced.

It is a schematic block diagram of the compressor of a 1st embodiment. It is the elements on larger scale which expanded the part of the electric motor of FIG. It is a schematic block diagram of the compressor of a 2nd embodiment. It is the elements on larger scale which expanded the part of the motor of FIG. It is a schematic block diagram of the compressor of a 3rd embodiment. It is a schematic block diagram of the conventional compressor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the present specification, the description “axial direction” refers to the direction in which the rotation axis constituting the rotor extends (the extension in the state in which the rotor of the motor is rotatably supported with respect to the stator). Represents the direction).
Moreover, the description "upper" or "upper" indicates the upper side or the upper side along the vertical direction unless otherwise noted, and the description "lower" or "lower" is otherwise noted. Represents the lower side or the lower side along the vertical direction.

A first embodiment of the compressor of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing a schematic configuration of a compressor 100 according to a first embodiment. FIG. 2 is an enlarged view of a portion of the motor 130 of FIG. That is, FIG. 2 is a view showing a schematic configuration of the first embodiment of the motor of the present invention.
The compressor 100 according to the first embodiment is configured as a scroll-type hermetic compressor in which a scroll-type compression mechanism unit is disposed in a hermetic container.
The compressor 100 is configured of a hermetic container 110, a compression mechanism unit 120 housed in the hermetic container 110, an electric motor 130, and the like. In the present embodiment, the motor 130 is disposed below the compression mechanism portion 120 along the vertical direction.
In the closed container 110, the suction port 11 is provided above the electric motor 130, and the discharge port 112 is provided above the compression mechanism portion 120.
An oil reservoir 129 for storing lubricating oil supplied to the bearing portions 124 and 125 of the rotating shaft 161 and the sliding portion of the compression mechanism portion 120 is provided at the bottom of the sealed container 110 (below the motor 130). . In addition, a lubricating oil supply device 190 is provided which supplies the lubricating oil stored in the oil reservoir 129 to the compression mechanism section 120 via the lubricating oil supply pipe 191.
The closed container 110 corresponds to the "container" of the present invention.

The compression mechanism unit 120 compresses a working medium (generally called “refrigerant”) that transfers heat energy. As a working medium, an HFC (hydrofluorocarbon) refrigerant having a zero ozone depletion potential (ODP), such as HFC-R410a, is used. In addition, in recent years, global warming potential (GWP) is smaller than HFC-R410a (about 1/3) HFC-R32 has come to be used.
The compression mechanism portion 120 is configured of a fixed scroll 121, a orbiting scroll 122 rotated by a rotating shaft 161, and a compression chamber 123. The rotating shaft 161 is rotatably supported by bearings 124 and 125. Further, the discharge unit 126 discharges the working medium compressed by the compression chamber 123 into the discharge chamber 127 a formed by the discharge chamber forming wall 127. Further, it has a first communication hole 120 a and a second communication hole 120 b which communicate the motor 120 side in the axial direction of the compression mechanism portion 120 with the opposite side to the motor 120. In the present embodiment, the first communication hole 120 a communicates the discharge chamber 127 a with the electric motor 130 side of the compression mechanism portion 120.
Further, the compression mechanism portion 120 is provided with a guide member 128. The guide member 128 guides the working medium having passed through the first communication hole 120 a to a rotor passage 160 of the electric motor 130 described later.
When the orbiting scroll 122 of the compression mechanism portion 120 is rotated by the rotation of the rotation shaft 161, the working medium sucked from the suction port 111 is compressed in the compression chamber 123 and discharged into the discharge chamber 127a.
The first communication hole 120 a and the second communication hole 120 b correspond to “a first communication hole and a second communication hole that communicate the motor side of the compression mechanism and the opposite side of the motor” according to the present invention.

A motor 130 for driving the compression mechanism portion 120 is constituted by a stator 140 and a rotor 160 supported rotatably with respect to the stator 140.
The stator 140 has a stator core 150 and a stator winding 141. The stator core 150 is formed by laminating a plurality of thin plate-like electromagnetic steel plates. Stator core 150 is formed by a yoke extending along the circumferential direction, teeth extending radially from the yoke along the radial direction, and teeth adjacent along the circumferential direction when viewed in a cross section perpendicular to the axial direction. Slot has been The stator winding 141 is disposed in the slot by a distributed winding method, a concentrated winding method, or the like. The inner peripheral shape of the sealed container 110 and the outer peripheral shape of the stator core 150 (virtual outer peripheral shape in which the notch portion is not formed) are formed in an appropriate shape including a circle.

On the outer peripheral side of the stator core 150, a notch extending along the axial direction is formed at an appropriate location along the circumferential direction. The lower end surface 150A and the upper end surface 150B of the stator core 150 are communicated with each other between the outer peripheral surface of the stator core 150 and the inner peripheral surface 110a of the hermetic container 110 by this notch portion. A stator passage 170 (which communicates with the compression mechanism portion 120 and the opposite side to the compression mechanism portion 120 side) is formed along the inner circumferential surface 110 a of the sealed container 110.
In the present embodiment, the outer peripheral surface of the stator core 150 forming the stator passage 170 is higher than the first outer peripheral wall 150 a forming the first passage portion 170 a and the first outer peripheral wall 150 a (compression mechanism A second outer peripheral wall 150c disposed on the side of the portion 120 and forming a second passage portion 170b, and a connecting wall 150b connecting the first outer peripheral wall 150a and the second outer peripheral wall 150c . In the present embodiment, the first outer peripheral wall 150 a and the second outer peripheral wall 150 c are formed to extend in parallel (including “substantially parallel”) in the axial direction, and the connecting wall 150 b is a first outer peripheral wall It is formed to be orthogonal to (including “substantially orthogonal to”) the extending direction of 150 a. The first outer peripheral wall 150 a and the second outer peripheral wall 150 c have an interval between the second outer peripheral wall 150 c and the inner peripheral surface 110 a of the closed container 110 that is the first outer peripheral wall 150 a and the inner peripheral surface of the closed container 110. It is formed in a step-like shape (step-like shape) along the axial direction so as to be larger than the distance between 110 a.
Accordingly, the first passage portion 170a having the first passage area 170t1 and the upper portion of the first passage portion 170a are provided between the outer peripheral surface of the stator core 150 and the inner peripheral surface 110a of the hermetic container 110 (compression The stator passage 170, which is disposed on the side of the mechanism portion 120, is constituted by a second passage portion 170b having a second passage area 170t2 (170t2> 170t1) larger than the first passage area 170t1 along the axial direction. (The end surfaces 150A and 150B along the axial direction of the stator core 150 are formed to communicate with each other). The passage area is an area of a cross section which intersects (typically, is orthogonal (including “substantially orthogonal”)) the extending direction of the passage (passage portion).
A stator passage 170 is formed along the axial direction between the outer peripheral surface of the stator core of the present invention and the inner peripheral surface of the container so as to communicate the compression mechanism side and the opposite side to the compression mechanism. A stator passage formed between the outer peripheral surface of the stator core and the outer peripheral surface of the stator core and the inner peripheral surface of the container along the axial direction so as to communicate one side and the other side along the axial direction Correspond to
The first passage portion 170a and the second passage portion 170b correspond to the "first passage portion of the stator passage" and the "second passage portion of the stator passage" in the present invention, and the first outer circumferential wall The second outer circumferential wall 150c and the connecting wall 150b correspond to the "first outer circumferential wall of the stator", the "second outer circumferential wall of the stator" and the "connecting wall of the stator" in the present invention.

The rotor 160 is composed of a rotating shaft 161 and a rotor core 162.
The rotor core 162 has a tubular shape, and is formed by laminating a plurality of plate-like electromagnetic steel plates. End plates 163 and balance weights 164 are disposed at both axial ends of the laminate. Then, the laminated body, the end plate 163 and the balance weight 164 are integrated by the caulking pins 165 inserted into the caulking pin insertion holes. The rotor core 162 is rotatably disposed on the inner peripheral side of the stator core 150 in a state where the rotary shaft 161 is inserted into the rotary shaft insertion hole. Thus, a gap (air gap) 131 along the axial direction is formed between the inner peripheral surface of the stator core 150 and the outer peripheral surface of the rotor core 162.
Although not shown, a magnet insertion hole is formed in the rotor core 162, and a permanent magnet is inserted into the magnet insertion hole.

In the rotor core 162, the lower end surface 162A and the upper end surface 162B of the rotor core 162 are communicated with each other at an appropriate location along the circumferential direction (compression of the rotor core 162 opposite the compression mechanism 120 and compression) A rotor passage 180 communicating with the mechanism unit 120 is formed.
In the present embodiment, the rotor passage 180 includes a first passage wall 181a, a second passage wall 181c disposed below the first passage wall 181a (opposite to the compression mechanism portion 120), and a first passage wall 181a. It is formed of a connecting wall 181 b which connects the first passage wall 181 a and the second passage wall 181 c. The first passage wall 181a forms a first passage portion 180a having a first passage area 180t1. The second passage wall 181c forms a second passage portion 180b having a second passage area 180t2 (180t2> 180t1) which is larger than the first passage area 180t1. In the present embodiment, since the rotor passage 180 having a circular cross-sectional shape is used, the inner diameter of the second passage portion 180b is set to be larger than the inner diameter of the first passage portion 180a. In the present embodiment, the first passage wall 181 a and the second passage wall 181 c are formed to extend in parallel in the axial direction (including “substantially parallel”), and the connecting wall 181 b is a first passage wall. It is formed to be orthogonal (including “substantially orthogonal”) to the extending direction of 181 a.
As a result, the rotor core 162 is provided with the first passage portion 180a having the first passage area 180t1 and the lower side (the opposite side to the compression mechanism portion 120) than the first passage portion 180a. The rotor passage 180 is formed by the second passage portion 180b having the second passage area 180t2 (180t2> 180t1) larger than the area 180t1 along the axial direction (both end surfaces along the axial direction of the rotor core 162 (To communicate 162A and 162B). When the rotor passage 180 is closed by the end plate 163, a through hole is formed at a position facing the rotor passage 180 of the end plate 163.
The rotor passages 180, of the present invention in or "rotor core" to the rotor core, the opposite side of the compression mechanism side and the compression mechanism portion rotor passages are formed along the axial direction so as to communicate " It corresponds to “a rotor passage formed along the axial direction so as to connect one side and the other side along the axial direction”.
The first passage portion 180a and the second passage portion 180b correspond to the "first passage portion of the rotor passage" and the "second passage portion of the rotor passage" in the present invention, and the first passage wall The 181a, the second passage wall 181c and the connection wall 181b correspond to the "first passage wall of the rotor", the "second passage wall of the rotor" and the "connection wall of the rotor" in the present invention.

Next, the operation of the compressor 100 of the present embodiment will be described.
When a magnetic field is generated from the stator winding 141 by the supply of current to the stator winding 141 and the rotor 160 (rotation shaft 161) is rotated, the orbiting scroll 122 of the compression mechanism unit 120 is rotated, and from the suction port 111 The suctioned working medium is compressed by the compression mechanism unit 120.
The working medium compressed by the compression mechanism unit 120 is discharged from the discharge unit 126 into the discharge chamber 127a. The working medium in the discharge chamber 127 a passes through the first communication hole 120 a and is guided by the guide member 128 to the rotor passage 180 formed in the rotor core 162. The working medium flows from the upper side (the compression mechanism portion 120 side) to the lower side (the opposite side to the compression mechanism portion 120) of the electric motor 130 through the rotor passage 180. Furthermore, through the stator passage 170 formed between the outer peripheral surface of the stator core 150 and the inner peripheral surface 110 a of the hermetic container 110, compression (compression) from above (opposite the compression mechanism portion 120) to above (compression) It flows to the mechanism part 120 side). Then, the ink is discharged from the discharge port 112 through the second communication passage 120 b.

Here, in the lower space of the compression mechanism portion 120 and the lower space of the motor 130, a part of the lubricating oil is scattered as oil droplets. For this reason, when the working medium flows from the compression mechanism part 120 to the electric motor 130 and from the electric motor 130 to the compression mechanism part 120, the working medium and the oil droplet come in contact and the working medium captures the oil droplet, Lubricant is mixed.
In the present embodiment, the working medium mixed with lubricating oil is passed through the rotor passage 180 and the stator passage 170. Thus, in the rotor passage 180 and the stator passage 170, the working medium mixed with lubricating oil contacts the outer peripheral wall forming the stator passage and the passage wall forming the rotor passage, thereby causing the working medium to contact the working medium. The mixed lubricating oil is separated and returned to the oil reservoir 129 by gravity or the like.

Furthermore, in the present embodiment, the rotor passage 180 is disposed below the first passage portion 180a having the first passage area 180t1 and the first passage portion 180a (opposite to the compression mechanism portion 120). , And a second passage portion 180b having a second passage area 180t2 larger than the first passage area 180t1.
As a result, when the working medium moves in the rotor passage 180 from the side of the compression mechanism 120 to the side opposite to the compression mechanism 120, the passage area becomes large and the moving speed of the working medium decreases. As the moving speed of the working medium decreases, small particles of lubricating oil mixed in the working medium combine with one another to form large particles. When the small particles of lubricating oil mixed in the working medium become large particles, they drop by gravity. Thereby, the lubricating oil mixed in the working medium is effectively separated.
Further, the stator passage 170 is disposed above the first passage portion 170a having the first passage area 170t1 and above the first passage portion 170a (on the side of the compression mechanism portion 120), and from the first passage area 170t1. It is constituted by the second passage portion 170b having a large second passage area 170t2.
As a result, when the working medium moves in the stator passage 170 from the opposite side to the compression mechanism part 120 from the side opposite to the compression mechanism part 120, the passage area becomes large, so the moving speed of the working medium decreases. As the moving speed of the working medium decreases, small particles of lubricating oil mixed in the working medium combine with one another to form large particles. When the small particles of lubricating oil mixed in the working medium become large particles, they drop by gravity. Thereby, the lubricating oil mixed in the working medium is effectively separated.
Therefore, in the present embodiment, the amount of lubricating oil mixed in the working medium discharged from discharge port 112 compared to the conventional compressor in which the passage areas of stator passage 170 and rotor passage 180 are constant. It can be reduced.
The positions and the number of the stator passages 170, the first passage area 170t1 of the first passage portion 170a of the stator passage 170, and the second passage area 170t2 of the second passage portion 170b It is appropriately set in consideration of the separation effect of the lubricating oil mixed in the magnetic circuit and the working medium. Also, the position and number of the rotor passage 180, the first passage area 180 t 1 of the first passage portion 180 a of the rotor passage 180, and the second passage area 180 t 2 of the second passage portion 180 b It is appropriately set in consideration of the separation effect of the lubricating oil mixed in the magnetic circuit and the working medium.

In the compressor 100 according to the first embodiment, the stator passage 170 and the rotor passage 180 are configured by two passage portions having different passage areas (the number of steps is set to one step). However, the passage areas are different 3 It can also be composed of three or more passage parts (set in two or more stages).
The compressor according to the second embodiment in which the stator passage and the rotor passage are configured by three passage portions having different passage areas (the number of steps is set to two steps) will be described with reference to FIGS. 3 and 4. Do. FIG. 3 is a diagram showing a schematic configuration of a compressor 200 according to the second embodiment. 4 is an enlarged view of a portion of the motor 230 of FIG. That is, FIG. 4 is a view showing a schematic configuration of a second embodiment of the motor of the present invention.

In FIG. 3 and FIG. 4, the components attached with the same reference numerals as those in FIG. 1 and FIG.
The compressor 200 according to the second embodiment is different from the stator passage 170 and the rotor passage 180 of the compressor 100 according to the first embodiment only in the configuration of the stator passage 270 and the rotor passage 280. The other configurations are the same.
Therefore, in the following, only the stator passage 270 and the rotor passage 280 of the compressor 200 according to the second embodiment will be described.

On the outer peripheral side of the stator core 250, a notch extending along the axial direction is formed at an appropriate location along the circumferential direction. The lower end surface 250A and the upper end surface 250B of the stator core 250 are communicated with each other between the outer peripheral surface of the stator core 250 and the inner peripheral surface 210a of the hermetic container 210 by this notch portion. A stator passage 270 is formed which communicates the compression mechanism 220 side and the opposite side to the compression mechanism 220.

The outer peripheral surface of the stator core 250 forming the stator passage 270 is disposed above the first outer peripheral wall 250 a forming the first passage portion 270 a and the first outer peripheral wall 250 a (on the compression mechanism portion 120 side) A second outer peripheral wall 250c forming the second passage portion 270b, and a third upper side (the compression mechanism portion 120 side) above the second outer peripheral wall 250c to form the third passage portion 270c. A second connecting wall 250b connecting the first outer wall 250a and the second outer wall 250c; and a second connecting the second outer wall 250c and the third outer wall 250e. It has a connecting wall 250d. In the present embodiment, the first outer peripheral wall 250a, the second outer peripheral wall 250c, and the third outer peripheral wall 250e are formed to extend in parallel (including “substantially parallel”) in the axial direction, The connecting wall 250 b and the second connecting rod 250 d are formed to be orthogonal (including “substantially orthogonal”) in the axial direction. The first outer peripheral wall 250a, the second outer peripheral wall 250c, and the third outer peripheral wall 250e are configured such that the distance between the second outer peripheral wall 250c and the inner peripheral surface 210a of the sealed container 210 is the first outer peripheral wall 250a The distance between the third outer peripheral wall 250 e and the inner peripheral surface 210 a of the closed container 210 becomes larger than the distance between the inner peripheral surface 210 a of the closed container 210, and the inner space of the second outer peripheral wall 250 c and the closed container 210. It is formed in the shape of a step (step shape) along the axial direction so as to be larger than the distance between it and the circumferential surface 210a.
Thus, the first passage portion 270a having the first passage area 270t1 and the upper portion of the first passage portion 270a are provided between the outer peripheral surface of the stator core 250 and the inner peripheral surface 210a of the hermetic container 210 (compression A second passage portion 270b disposed on the side of the mechanism portion 220 and having a second passage area 270t2 (270t2> 270t1) larger than the first passage area 270t1, and above the second passage portion 270b (compression mechanism portion) Fixed in the axial direction (fixed), the stator passage 270 being constituted by the third passage portion 270c disposed on the 220 side and having the third passage area 270t3 (270t3> 270t2) larger than the second passage area 270t2 It is formed to connect both end faces 250A and 250B along the axial direction of the daughter core 250).
A stator passage 270 is formed along the axial direction between the outer peripheral surface of the stator core of the present invention and the inner peripheral surface of the container so as to communicate the compression mechanism side and the opposite side to the compression mechanism. A stator passage formed between the outer peripheral surface of the stator core and the outer peripheral surface of the stator core and the inner peripheral surface of the container along the axial direction so as to communicate one side and the other side along the axial direction Correspond to
The first passage portion 270 a and the second passage portion 270 b (the second passage portion 270 b and the third passage portion 270 c) are the “first passage portion of the stator passage” and “the stator passage of the present invention”. First outer circumferential wall 250a, second outer circumferential wall 250c, and first connecting wall 250b (second outer circumferential wall 250c, third outer circumferential wall 250e, and second linking wall) 250 d) corresponds to the “first outer circumferential wall of the stator”, the “second outer circumferential wall of the stator” and the “connection wall of the stator” of the present invention.

In the rotor core 262, the lower end surface 262A and the upper end surface 262B of the rotor core 262 are communicated with each other at an appropriate location along the circumferential direction (the compression mechanism portion 220 side of the rotor core 262 and the compression mechanism portion A rotor passage 280 communicating with the opposite side is formed.
Rotor passage 280 includes a first passage wall 281a, a second passage wall 281c disposed lower than first passage wall 281a (opposite to compression mechanism 220), and a second passage wall 281c. A third passage wall 281e disposed on the lower side (opposite the compression mechanism portion 220), a first connection wall 281b connecting the first passage wall 281a and the second passage wall 281c, and a second It is formed of a second connection wall 281d connecting the passage wall 281c and the third passage wall 281e. The first passage wall 281a forms a first passage portion 280a having a first passage area 280t1. The second passage wall 281c forms a second passage portion 280b having a second passage area 280t2 (280t2> 280t1) which is larger than the first passage area 280t1. The third passage wall 281 e forms a third passage portion 280 c having a third passage area 280 t 3 (280 t 3> 280 t 2) larger than the second passage area 280 t 2.
As a result, the rotor core 262 is provided with the first passage portion 280a having the first passage area 280t1 and the lower side of the first passage portion 280a (opposite to the compression mechanism portion 220). A second passage portion 280b having a second passage area 280t2 (280t2> 280t1) larger than the area 280t1 and disposed below the second passage portion 280b (opposite to the compression mechanism portion 220), the second passage The rotor passage 280 is formed by a third passage portion 280c having a third passage area 280t3 (280t3> 280t2) larger than the area 280t2 along the axial direction (both end surfaces along the axial direction of the rotor core 262 (To communicate 262A and 262B).
The rotor passages 280, of the present invention in or "rotor core" to the rotor core, the opposite side of the compression mechanism side and the compression mechanism portion rotor passages are formed along the axial direction so as to communicate " It corresponds to “a rotor passage formed along the axial direction so as to connect one side and the other side along the axial direction”.
The first passage portion 280a and the second passage portion 280b (the second passage portion 280b and the third passage portion 280c) are the “first passage portion of the rotor passage” and “the rotor passage of the present invention”. First passage wall 281a, second passage wall 281c and first connection wall 281b (second passage wall 281c, third passage wall 281e and second connection wall corresponding to the second passage portion " 281 d) corresponds to the “first passage wall of the rotor”, the “second passage wall of the rotor” and the “connection wall of the rotor” in the present invention.

In the present embodiment, the first passage portion 280 a having a first passage area 280 t 1, a second passage area 280 t 1, in which the rotor passage 280 is disposed in order from the compression mechanism 220 side to the opposite side to the compression mechanism 220. A second passage portion 280b having a passage area 280t2 (280t2> 280t1), and a third passage portion 280c having a third passage area 280t3 (280t3> 280t2).
Thereby, when the working medium moves from the first passage portion 280a to the second passage portion 280b of the rotor passage 280 and from the second passage portion 280b to the third passage portion 280c, the passage area The movement speed of the working medium decreases due to the increase of. That is, when the working medium moves in the rotor passage 280 from the side of the compression mechanism 220 to the side opposite to the compression mechanism 220, the lubricating oil separation operation is performed multiple times due to the decrease in the moving speed of the working medium.
In addition, a first passage portion 270a having a first passage area 270t1 and a second passage area 270t2 (in which the stator passage 270 is sequentially disposed on the side of the compression mechanism 220 from the opposite side to the compression mechanism 220) A second passage portion 270b having 270t2> 270t1), and a third passage portion 270c having a third passage area 270t3 (270t3> 270t2).
Thereby, when the working medium moves from the first passage portion 270a to the second passage portion 270b of the stator passage 270 and from the second passage portion 270b to the third passage portion 270c, By increasing the passage area of the moving medium, the moving speed of the working medium is reduced. That is, when the working medium moves in the stator passage 270 from the opposite side of the compression mechanism 220 to the compression mechanism 220, the lubricating oil separation operation is performed multiple times due to the decrease in the moving speed of the working medium.
Therefore, in the present embodiment, the amount of lubricating oil mixed into the working medium discharged from the discharge port 212 can be further reduced.

In the first embodiment and the second embodiment, the stator passage and the rotor passage are constituted by passage portions having different passage areas, but at least one of the passages is constituted by passage portions having different passage areas. The amount of lubricating oil mixed into the working medium discharged from the discharge port can be reduced.
A third embodiment of the compressor according to the invention, in which the stator passages are constituted by passage portions with different passage areas, will be described with reference to FIG. FIG. 5 is a diagram showing a schematic configuration of a compressor 300 according to the third embodiment. The motor 330 shown in FIG. 5 shows a third embodiment of the motor of the present invention.

In FIG. 5, the components attached with the same reference numerals as those of the components shown in FIG. 1 and the components other than the one-hundreds represent the same components.
Between the outer peripheral surface of the stator core 350 and the inner peripheral surface of the hermetic container 310, as in the first embodiment, a first passage portion having a first passage area, and a first passage portion And the stator passage 370 is formed by a second passage portion disposed above (the compression mechanism 320 side) and having a second passage area larger than the first passage area along the axial direction. In order to connect both end faces 350A and 350B along the axial direction of 350).
In the rotor core 362 constituting the rotor 360, the lower end surface 362A and the upper end surface 362B of the rotor core 362 are communicated at an appropriate location along the circumferential direction (a compression mechanism portion of the rotor core 362 A rotor passage 380 communicating with the opposite side to the side of the compression mechanism 320 is formed. In the present embodiment, rotor passage 380 is formed such that the passage area is constant (including “substantially constant”).
The operation of the compressor 300 of the present embodiment is similar to that of the compressor 100 of the first embodiment except that the working medium passes through the rotor passage 380 having a constant passage area.
In the present embodiment, when the working medium passes through the stator passage 370, the lubricating oil mixed in the working medium is separated and collected in the oil reservoir 329 by gravity or the like. Thus, the amount of lubricating oil mixed into the working medium discharged from the discharge port 312 can be reduced.

The present invention is not limited to the configuration described in the embodiment, and various modifications, additions, and deletions are possible.
In the embodiment, the magnet embedded electric motor in which the permanent magnet is inserted in the magnet insertion hole formed in the rotor core has been described, but the electric motor of the present invention includes a sealed container, a rotor, a stator, a stator It is sufficient to provide at least one of the passage and the rotor passage, and the type of motor and the specific configuration of each component can be changed variously.
Although the scroll type compression mechanism unit has been described in the embodiment, the compressor mechanism unit is not limited to the scroll type compression mechanism unit, and compression mechanism units of various configurations can be used.
The number of steps in the stator passage and the number of steps in the rotor passage may be one or two or more. Also, the number of steps in the stator passage may be different from the number of steps in the rotor passage.
The stator passage and the rotor passage are preferably formed in a step-like shape, but may be formed in other shapes.
The connection wall forming the stator passage is preferably formed to be orthogonal (including “substantially orthogonal”) to the extending direction of the outer peripheral wall on the opposite side (the other side along the axial direction) to the compression mechanism portion However, they may be formed in other shapes, for example, in an inclined shape. In addition, it is preferable that the connection wall forming the rotor passage be formed to be orthogonal (including “substantially orthogonal”) to the extending direction of the passage wall on the compression mechanism side (one side along the axial direction) However, they may be formed in other shapes, for example, in an inclined shape.
In the embodiment, the stator passage and the rotor passage are constituted by passage portions having different passage areas, but at least one of the stator passage and the rotor passage is constituted by passage portions having different passage areas. It should just be.
The cross-sectional shapes of the stator passage and the rotor passage can be set as appropriate. For example, a part of the outer periphery of a circular shape, a shape extending in an arc or straight line along the circumferential direction, or a shape corresponding to the inner peripheral surface of a sealed container (circular shape or polygonal shape) is cut in a straight line or curved line It can be set to a missing shape or the like.
The arrangement position and number of the stator passages and the rotor passages can be set as appropriate.
In the embodiment, the working medium compressed by the compression mechanism is passed along the axial direction from the compression mechanism side of the motor by the rotor passage from the compression mechanism side to the opposite side of the compression mechanism, and along the axial direction by the stator passage. It is configured to pass from the opposite side to the compression mechanism side to the compression mechanism side, but the stator passage passes from the compression mechanism side to the opposite side along the axial direction from the compression mechanism side to the shaft by the rotor passage. It can also be configured to pass from the opposite side to the compression mechanism side along the direction to the compression mechanism side.
Although the guide member for guiding the working medium having passed through the first communication hole to the rotor passage is provided, a guide member for guiding the working medium may be provided at another place. Furthermore, the guide member can be omitted.
A discharge chamber provided on the opposite side of the motor of the compression mechanism, a first communication hole communicating the motor side with the opposite side (discharge chamber) of the compression mechanism and the motor, a side opposite to the motor of the compression mechanism The working medium compressed by the compression mechanism is made to flow to the discharge port using the second communicating hole that communicates, but the configuration to flow the working medium compressed by the compression mechanism to the discharge port is limited to this I will not.
Each configuration described in the embodiment can be used alone or in combination of a plurality selected appropriately.

The present invention can be configured as follows.
(Aspect 1)
It is a compressor as described in any one of Claims 1-4 , Comprising:
The compressor has a discharge port above the compression mechanism portion along the vertical direction and an oil reservoir below the motor.
In this aspect, preferably, a scroll-type compression mechanism unit is used as the compression mechanism unit.
(Aspect 2)
A compressor according to aspect 1;
A compressor having a first communication hole and a second communication hole communicating the electric motor side of the compression mechanism and the opposite side of the electric motor;
In this aspect, the working medium can easily flow along the axial direction.
(Aspect 3)
A compressor according to aspect 2;
The compression mechanism portion has a discharge chamber on the opposite side to the electric motor from which the compressed working medium is discharged, and one of the first communication hole and the second communication hole is the electric motor A compressor which is in communication with the discharge chamber on the opposite side.
In this aspect, the working medium compressed by the compression mechanism portion can be easily flowed to the motor side.
(Aspect 4)
A compressor according to aspect 3;
A compressor comprising: a guide member for guiding a working medium having passed through the one of the first communication hole and the second communication hole to the first passage.
In this aspect, the lubricating oil mixed in the working medium can be efficiently separated.

100, 200, 300, 400 Compressor 110, 210, 310, 410 Sealed container 111, 211, 311, 411 Suction port 112, 212, 312, 412 Discharge port 120, 220, 320 Compression mechanism part 120a, 220a, 320a, 420a first communication holes 120b, 220b, 320b, 420b second communication holes 121, 221, 321, 421 fixed scrolls 122, 222, 322, 422 orbiting scrolls 123, 223, 323, 423 compression chambers 124, 125, 224 225, 324, 325, 424, 425 Bearings 126, 226, 326, 426 Discharges 127, 227, 327, 427 Discharge chamber forming wall 127a, 227a, 327a Discharge chamber 128, 228, 328, 428 Guide member 129, 229, 329, 429 oil sumps 130, 230, 330, 430 Electric motor 13, 231, 331, 431 Air gap
140, 240, 340, 440 Stator 141, 241, 341, 441 Stator winding 150, 250, 350, 450 Stator core 150a, 150c, 250a, 250c, 250 Outer peripheral wall 150b, 250b, 250d Connection wall 160, 260, 360, 460 Rotor 161, 261, 361, 461 Rotating shaft 162, 262, 362, 462 Rotor core 163, 263, 363, 463 End plate 164, 264, 364, 464 Balance weight 165, 265, 365, 465 Cage pins 170, 270, 370, 470 Stator passages 170a, 170b, 270a, 270b, 270c passage portions 180, 280, 380, 480 Rotor passages 180a, 180b, 280a, 280b, 280c passage portions 181a, 181c, 281a, 81c, 281 e passage wall 181b, 281b, 281d connecting wall 190,290,390,490 lubricating oil supply device 191,291,391,491 lubricating oil supply pipe

Claims (6)

A container, a compression mechanism portion provided in the container for compressing a working medium, and a motor for driving the compression mechanism portion, the electric motor including the compression mechanism portion along the vertical direction The compression mechanism section side and the compression mechanism section are disposed on the lower side, a stator, a rotor rotatable relative to the stator, and a rotor core constituting the rotor A rotor passage formed along the axial direction so as to communicate the opposite side, and between the outer peripheral surface of a stator core constituting the stator and the inner peripheral surface of the container, The stator passage is formed along the axial direction so as to communicate with the compression mechanism portion on the opposite side, and the working medium compresses the one of the rotor passage and the stator passage. Moving from the mechanical part side to the opposite side to the compression mechanical part, A compressor for moving the other passage of said stator passage and trochanter passage from the side opposite to the compression mechanism to the compression mechanism portion side,
The one passage is formed such that the passage area of the passage portion opposite to the compression mechanism portion is larger than the passage area of the passage portion on the compression mechanism portion side,
A compressor characterized in that the other passage is formed such that the passage area of the passage portion on the compression mechanism side is larger than the passage area of the passage portion on the opposite side to the compression mechanism. A compressor according to claim 1, wherein
The first passage portion having a first passage area, and the first passage portion of the first passage portion is disposed opposite to the compression mechanism portion with respect to the first passage portion. Comprising a second passage portion having a second passage area larger than the area,
The other passage is a first passage portion having a first passage area, and is disposed closer to the compression mechanism portion than the first passage portion, and the first passage area of the first passage portion is A compressor characterized by a second passage portion having a large second passage area. The compressor according to claim 2, wherein
The one passage is the rotor passage,
A passage wall forming the rotor passage is a first passage wall forming the first passage portion having the first passage area, and a side opposite to the compression mechanism portion with respect to the first passage wall A second passage wall is disposed and forms the second passage portion having the second passage area larger than the first passage area, and connects the first passage wall and the second passage wall Consisting of connecting walls,
The other passage is the stator passage,
The outer peripheral surface of the stator core forming the stator passage is a first outer peripheral wall forming the first passage portion having the first passage area, and the compression mechanism from the first outer peripheral wall A second outer peripheral wall disposed on the part side and forming the second passage portion having the second passage area larger than the first passage area, the first outer peripheral wall, and the second outer periphery A compressor characterized by comprising a connecting wall connecting the walls. The compressor according to claim 2, wherein
The one passage is the stator passage,
The outer peripheral surface of the stator core forming the stator passage is a first outer peripheral wall forming the first passage portion having the first passage area, and the compression mechanism from the first outer peripheral wall A second outer circumferential wall forming the second passage portion having a second passage area larger than the first passage area, the second outer circumferential wall, the first outer circumferential wall, and the second And a connecting wall connecting the outer peripheral walls of the
The other passage is the rotor passage,
A passage wall forming the rotor passage is disposed closer to the compression mechanism portion than the first passage wall forming the first passage portion having the first passage area, and the first passage wall. A second passage wall forming the second passage portion having the second area larger than the first area, and a connecting wall connecting the first passage wall and the second passage wall A compressor characterized in that it is configured. A container, a stator provided in the container, a rotor rotatable relative to the stator, and a rotor core constituting the rotor, in one side along the axial direction and in the axial direction Along the axial direction, between the rotor passage formed along the axial direction so as to communicate the other side along and the outer peripheral surface of the stator core constituting the stator and the inner peripheral surface of the container And a stator passage formed along the axial direction so as to communicate the other side along the axial direction with the one side, and the working medium is one of the rotor passage and the stator passage. And move from the one side along the axial direction to the other side along the axial direction, and from the other side along the axial direction the other of the rotor passage and the stator passage. A motor moving to said one side along a direction ,
The one passage is formed such that the passage area of the other passage portion along the axial direction is larger than the passage area of the one passage portion along the axial direction,
The motor according to the present invention is characterized in that the other passage is formed such that the passage area of the one passage portion along the axial direction is larger than the passage area of the other passage portion along the axial direction. . The electric motor according to claim 5, wherein
The one passage is disposed on the other of the first passage portion having a first passage area and the other side along the axial direction of the first passage portion, and the first passage portion of the first passage portion is Comprising a second passage portion having a second passage area larger than the passage area;
The other passage is disposed on a first passage portion having a first passage area, and on one side along the axial direction of the first passage portion, and the first passage portion of the first passage portion is disposed. A motor comprising a second passage portion having a second passage area larger than the passage area.

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