JP6509540B2 - 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 440, and the like. The compressor 400 shown in FIG. 7 is configured as a rotary type compressor having a rotary type compression mechanism unit 420.
A motor 440 is disposed above the compression mechanism 420 along the vertical direction (vertical arrangement). Further, a discharge port 412 is provided above the motor 440, and an oil reservoir 426 is provided below the compression mechanism 420. The oil reservoir 426 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 440 has a stator 450 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 451 constituting the stator 450 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 discharged from the discharge port 412 through the stator passage 470 and the rotor passage 480.
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 426 is reduced, which may cause oil shortage.
In the conventional compressor, by passing the working medium compressed by the compression mechanism 420 through the stator passage 470 and the rotor passage 480, the lubricating oil mixed in the working medium is separated, and the oil reservoir 426 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 441 formed between the inner peripheral surface of the stator core 451 and the outer peripheral surface of the rotor core 462 also functions as a passage for the working medium.

JP-A-7-236239

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 section 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, the passage area of the stator passage and the rotor passage is constant, and 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 is disposed above the compression mechanism along the vertical direction.
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.
As the compression mechanism portion, compression mechanism portions of various configurations can be used, but typically, a rotary 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.
And it has a passage formed along the axial direction so as to connect the compression mechanism side of the motor 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. . The working medium moves in the passage from the compression mechanism side to the opposite side of the compression mechanism.
In the present invention, the passage is formed between the outer peripheral surface of the rotor passage formed in the rotor core forming the rotor of the motor and the stator core forming the stator of the motor and the inner peripheral surface of the container. At least one of the stator passages. Furthermore, the 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 passage area is an area of a cross section which intersects (typically, is orthogonal (including “substantially orthogonal”)) the extending direction of the passage.
In the present invention, the passage for passing the working medium 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. When moving from the compression mechanism side to the opposite side to the compression mechanism side, 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, and the amount of the lubricating oil mixed in the working medium discharged from the discharge port can be reduced.
In a different form of the first aspect of the invention, the passage is provided with a first passage portion having a first passage area, and a passage disposed opposite to the compression mechanism portion with respect to the first passage portion and having a larger first passage area It is constituted by a second passage part having a passage area of two.
In another different form of the first invention, the passage wall forming the rotor passage is compressed from the first passage wall forming the first passage portion having the first passage area and the first passage wall. A second passage wall disposed opposite to the mechanism and forming a second passage portion having a second passage area (second passage area> first passage area) larger than the first passage area; And a connecting wall connecting the first passage wall and the second passage wall.
A step-like (step-like) passage is formed 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 aspect, when the working medium in which the lubricating oil is mixed passes through the rotor passage, the lubricating oil mixed in the working medium can be efficiently separated.
In another different form of the first invention, the outer peripheral surface of the stator core forming the stator passage comprises a first outer peripheral wall forming a first passage portion having a first passage area; A second passage portion which is disposed on the side opposite to the compression mechanism portion with respect to the outer peripheral wall and which has a second passage area (second passage area> first passage area) larger than the first passage area And a connecting wall for connecting the first outer peripheral wall and the second outer peripheral wall.
A step-like (step-like) passage is formed 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 aspect, when the working medium in which the lubricating oil is mixed passes through the stator passage, the lubricating oil mixed in the working medium can be efficiently separated.
In another different mode of the first invention, an oil separation member (oil separator) is provided at a position opposite to the compression mechanism portion with respect to the rotor passage, at a position facing the opening of the rotor passage.
The oil separating member is configured as a member having an impact surface against which the working medium passing through the rotor passage is hit. As an oil separation member, generally, an impact surface, on which the working medium passed through the rotor passage, is in a direction perpendicular to the flow direction of the working medium flowing out of the opening of the rotor passage, typically orthogonal A member, for example, a plate-like member, extending along a direction (including a “substantially orthogonal direction”) is used.
In the present embodiment, the working medium having passed through the rotor passage strikes the collision surface of the oil separating member, whereby the lubricating oil mixed in the working medium can be separated. Thus, the amount of lubricating oil contained in the working medium discharged from the discharge port can be further reduced.

The second invention. The present invention relates to a motor used in a compressor.
The motor according to the present invention has an axial direction so as to communicate the container, the stator provided in the container and the rotor rotatable relative to the stator, and one side and the other side along the axial direction. Have a passage formed along the The working medium moves from one side along the axial direction to the other side along the axial direction. The container is typically configured as a closed container. “One side” indicates, for example, the compression mechanism side of the motor, and “the other side” indicates, for example, the opposite side to the compression mechanism of the motor.
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 passage is a rotor passage formed in the rotor core forming the rotor and a stator passage formed between the outer peripheral surface of the stator core forming the stator and the inner peripheral surface of the container. At least one of the Furthermore, the 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.
In the present invention, typically, when the compression mechanism is disposed on one side along the axial direction from the motor, the working medium moves from one side to the other side along the axial direction in the passage. In addition, as the passage area increases, 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. As a result, the lubricating oil mixed in the working medium can be efficiently separated, and the amount of the lubricating oil mixed in the working medium discharged from the discharge port can be reduced.

  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 the elements on larger scale which expanded the part of the electric motor of FIG. 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 140 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 rotary-type hermetic compressor in which a rotary-type compression mechanism unit is disposed in a hermetic container.
The compressor 100 includes a closed container 110, a compression mechanism unit 120 housed in the closed container 110, an electric motor 140, an accumulator 130, and the like. In the present embodiment, the motor 140 is disposed above the compression mechanism portion 120 along the vertical direction.
In the sealed container 110, a suction port 111 is provided below the motor 140, and a discharge port 112 is provided above the motor 140. Further, at the bottom of the closed container 110 (below the compression mechanism 120), there is an oil reservoir 126 in which lubricating oil to be supplied to the bearings 124 and 125 of the rotating shaft 161 and sliding parts of the compression mechanism 120 is stored. It is provided.
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 cylinder 121, an eccentric rotor 122 rotated by a rotation shaft 161, and a compression chamber 123. The rotating shaft 161 is rotatably supported by bearings 124 and 125. When the eccentric rotor 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.
The lubricating oil stored in the oil reservoir 126 is supplied to the bearings 124 and 125, the sliding portion of the compression mechanism 120, and the like by the rotation of the rotary shaft 161. The lubricating oil that has lubricated the bearing portions 124 and 125 and the sliding portion is returned to the oil reservoir 126.

The motor 140 is composed of a stator 150 and a rotor 160 rotatably supported relative to the stator 150.
The stator 150 has a stator core 151 and a stator winding 152. The stator core 151 is formed by laminating a plurality of thin plate-like electromagnetic steel plates. The stator core 151 has a slot formed by a yoke extending along the circumferential direction, teeth extending radially from the yoke along the radial direction, and teeth circumferentially adjacent when viewed in a cross section perpendicular to the axial direction. have. The stator winding 152 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 151 (virtual outer peripheral shape in which the notch portion is not formed) are formed in an appropriate shape including a circular shape.

On the outer peripheral side of the stator core 151, at an appropriate location along the circumferential direction, a notch extending along the axial direction is formed. The lower end surface 151A and the upper end surface 151B of the stator core 151 communicate with each other between the outer peripheral surface of the stator core 151 and the inner peripheral surface 110a of the hermetic container 110 by this notch portion (of the stator core 151 A stator passage 170 communicating between the compression mechanism portion 120 side and the opposite side to the compression mechanism portion 120 is formed along the inner circumferential surface 110 a of the closed container 110.
In the present embodiment, the outer peripheral surface of the stator core 151 forming the stator passage 170 is higher than the first outer peripheral wall 151 a forming the first passage portion 170 a and the first outer peripheral wall 151 a (compression mechanism A second outer peripheral wall 151c which is disposed on the side opposite to the portion 120 and which forms the second passage portion 170b, and a connecting wall 151b which connects the first outer peripheral wall 151a and the second outer peripheral wall 151c ing. In the present embodiment, the first outer peripheral wall 151a and the second outer peripheral wall 151c are formed to extend in parallel (including “substantially parallel”) in the axial direction, and the connection wall 151b is the first outer peripheral wall It is formed to be orthogonal (including “substantially orthogonal”) to the extending direction of 151 a. The first outer peripheral wall 151a and the second outer peripheral wall 151c have an interval between the second outer peripheral wall 151c and the inner peripheral surface 110a of the closed container 110 being the first outer peripheral wall 151a 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 it and 110a.
Thus, the first passage portion 170a having the first passage area 170t1 and the upper portion of the first passage portion 170a are formed between the outer peripheral surface of the stator core 151 and the inner peripheral surface 110a of the hermetic container 110 (compression The stator passage 170 is axially formed by the second passage portion 170b disposed on the side opposite to the mechanism portion 120 and having the second passage area 170t2 (170t2> 170t1) larger than the first passage area 170t1. It is formed along (along the axial direction of the stator core 151 so as to connect both end surfaces 151A and 151B). 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 151a, the second outer peripheral wall 151c, and the connecting wall 151b correspond to the "first outer peripheral wall of the stator", the "second outer peripheral 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 151 in a state where the rotary shaft 161 is inserted into the rotary shaft insertion hole. Thus, a gap (air gap) 141 along the axial direction is formed between the inner circumferential surface of the stator core 151 and the outer circumferential 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 at an appropriate location along the circumferential direction (the compression mechanism 120 side of the rotor core 162 and the compression mechanism A rotor passage 180 communicating with the opposite side 120 is formed.
In the present embodiment, the rotor passage 180 includes a first passage wall 181a, a second passage wall 181c disposed above 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 180 a having the first passage area 180 t 1 and the first passage, which is disposed above the first passage portion 180 a (opposite to the compression mechanism portion 120). 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.

The accumulator 130 separates the lubricating oil mixed in the working medium discharged from the discharge port 112. In the accumulator 130, the working medium from which the lubricating oil is separated is returned to the compression mechanism section 120 via the suction rod 131 and the suction port 111.
The lubricating oil separated from the working medium by the accumulator 130 is returned to the oil reservoir 126.

Next, the operation of the compressor 100 of the present embodiment will be described.
When a magnetic field is generated from the stator winding 152 by the supply of current to the stator winding 152 and the rotor 160 (rotation shaft 161) rotates, the working medium sucked from the suction port 111 is compressed by the compression mechanism portion 120. It is compressed.
The working medium compressed by the compression mechanism portion 120 is a stator passage 170 formed between the outer circumferential surface of the stator core 151 and the inner circumferential surface 110 a of the closed vessel 110, and a rotor formed in the rotor core 162. The passage 180, through an air gap 141 formed between the inner circumferential surface of the stator core 151 and the outer circumferential surface of the rotor core 162, from above (compression mechanism portion 120 side) above the motor 140 (compression) It flows to the side opposite to the mechanical portion 120 and is discharged from the discharge port 112.

Here, in the lower space of the motor 140, part of the lubricating oil is scattered as oil droplets. For this reason, when the working medium moves from the compression mechanism portion 120 to the motor 140, the working medium and the oil drop come into contact, the working medium captures the oil drop, and the working oil is mixed with the lubricating oil.
In the present embodiment, the working medium mixed with lubricating oil is passed through the stator passage 170 and the rotor passage 180. Thus, in the stator passage 170 and the rotor passage 180, 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 mixed lubricating oil is separated and returned to the oil reservoir 126 by gravity or the like.

Furthermore, in the present embodiment, 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 (opposite to the compression mechanism portion 120). , And a second passage portion 170b having a second passage area 170t2 larger than the first passage area 170t1.
As a result, when the working medium moves in the stator passage 170 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 rotor passage 180 is disposed above the first passage portion 180a having the first passage area 180t1 and above the first passage portion 180a (opposite to the compression mechanism portion 120), and the first passage area is formed. It is constituted by a second passage portion 180b having a second passage area 180t2 larger than 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.
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 240 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 251, a notch is formed along the axial direction at an appropriate location along the circumferential direction. The lower end surface 251A and the upper end surface 251B of the stator core 251 communicate with each other between the outer peripheral surface of the stator core 251 and the inner peripheral surface 210a of the hermetic container 210 by this notch portion (of the stator core 251 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 251 forming the stator passage 270 is above the first outer peripheral wall 251 a forming the first passage portion 270 a and the first outer peripheral wall 251 a (opposite to the compression mechanism portion 120) And the second outer circumferential wall 251c forming the second passage portion 270b, and the second outer circumferential wall 251c above the second outer circumferential wall 251c (opposite to the compression mechanism portion 120) to form the third passage portion 270c. Connecting the third outer peripheral wall 251e, the first connecting wall 251b connecting the first outer peripheral wall 251a and the second outer peripheral wall 251c, and the second outer peripheral wall 251c and the third outer peripheral wall 251e And a second connecting wall 251d. In the present embodiment, the first outer peripheral wall 251a, the second outer peripheral wall 251c, and the third outer peripheral wall 251e are formed to extend in parallel (including “substantially parallel”) in the axial direction. The connecting wall 251 b and the second connecting rod 251 d are formed to be orthogonal to (including “substantially orthogonal”) in the axial direction. The first outer peripheral wall 251a, the second outer peripheral wall 251c, and the third outer peripheral wall 251e have a first outer peripheral wall 251a and a first outer peripheral wall 251a at a distance between the second outer peripheral wall 251c and the inner peripheral surface 210a of the sealed container 210. The distance between the third outer peripheral wall 251 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 251 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 251 and the inner peripheral surface 210a of the hermetic container 210 (compression A second passage portion 270b disposed on the side opposite to 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) The stator passage 270, which is disposed on the side opposite to the mechanism portion 220, is constituted by a third passage portion 270c having a third passage area 270t3 (270t3> 270t2) larger than the second passage area 270t2 in the axial direction. It is formed along (along the axial direction of the stator core 251 so as to connect both end faces 251A and 251B).
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 251a, second outer circumferential wall 251c, and first connecting wall 251b (second outer circumferential wall 251c, third outer circumferential wall 251e, and second linking wall) 251 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” in 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.
The rotor passage 280 includes a first passage wall 281a, a second passage wall 281c disposed above the first passage wall 281a (opposite to the compression mechanism 120), and a second passage wall 281c. A third passage wall 281e disposed on the upper side (opposite the compression mechanism portion 120), a first connecting 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 first passage, which is disposed above 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 above the second passage portion 280b (opposite to the compression mechanism portion 220), and 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, a first passage portion 270a having a first passage area 270t1 is disposed, in which the stator passage 270 is disposed in order from the side of the compression mechanism 220 to the side opposite to the compression mechanism 220; The second passage portion 270b has a passage area 270t2 (270t2> 270t1), and the third passage portion 270c has a third passage area 270t3 (270t3> 270t2).
Thus, 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, 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 stator passage 270 from the compression mechanism 220 side to the opposite side of 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 280a having a first passage area 280t1, a second passage area 280t2 (a 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 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.
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.

  Next, a third embodiment of the compressor of the present invention will be described with reference to FIG. 5 and FIG. FIG. 5 is a diagram showing a schematic configuration of a compressor 300 according to the third embodiment. 6 is an enlarged view of a portion of the motor 340 of FIG. That is, FIG. 6 is a view showing a schematic configuration of a third embodiment of the motor of the present invention.

In FIG. 5 and FIG. 6, the components attached with the same reference numerals as those in FIG. 1 and FIG.
The compressor 300 of the third embodiment restricts the flow of the working medium through the rotor passage and separates the lubricating oil mixed in the working medium (also referred to as "oil separator". It has the same configuration as that of the compressor 100 of the first embodiment except that there is provided.
Therefore, the oil separation member will be mainly described below.

Similar to the compressor 100 according to the first embodiment, the rotor core 362 constituting the rotor 360 includes a first passage portion 380a having a first passage area 380t1 and a first passage portion 380a. A rotor passage 380 is formed which is disposed on the upper side (opposite to the compression mechanism portion 320) and includes a second passage portion 280b having a second passage area 380t2 larger than the first passage area 380t1.
Further, an oil separating member 366 is provided above the rotor passage 380 (opposite to the compression mechanism portion 320) at a position facing the opening of the rotor passage 380.
In the present embodiment, as oil separation member 366, collision surface 366a facing the opening of rotor passage 380 (impacted by the working medium passing through the rotor passage) includes an axis perpendicular to the axial direction ("substantially orthogonal"). The rotary plate 361 is attached to a circular plate member extending in the
The oil separation member 366 is not limited to a circular plate-like member as long as the oil separation member 366 has the collision surface 366a on which the working medium passed through the rotor passage 380 contacts. Further, the collision surface 366a of the oil separation member 366 may be disposed so as to intersect in the axial direction, and may not be disposed so as to extend in the direction orthogonal to the axial direction. In addition, the oil separation member 366 may be attached to a location other than the rotation shaft 361.

In the present embodiment, the working medium mixed with lubricating oil, which has passed through the rotor passage 380, strikes the collision surface 366a of the oil separation member 366, and flows along the collision surface 366a in the circumferential direction. In this manner, the working medium contacts the collision surface 366a of the oil separation member 366, and the flow direction of the working medium is changed from the axial direction to the outer peripheral direction (radial direction), whereby the lubricating oil mixed in the working medium is separated. And returned to the oil reservoir 326 by gravity or the like. Thus, the amount of lubricating oil mixed into the working medium discharged from the discharge port 312 can be further reduced.
The oil separation member can also be used for the compressor and motor of the second embodiment shown in FIGS. 3 and 4.

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 rotary type compression mechanism section has been described in the embodiment, the compressor mechanism section is not limited to the rotary type compression mechanism section, and compression mechanism sections of various configurations can be used.
Although the motor having the stator passage and the rotor passage has been described, it is sufficient to have at least one of the stator passage and the rotor passage.
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 connecting 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 compression mechanism side (one side along the axial direction), You may form in shapes other than this, for example, inclination 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.
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 stator passage and the rotor passage are formed, and both the passages are constituted by passage portions having different passage areas, but at least one of the stator passage and the rotor passage has different passage areas. It should just be comprised by the passage part which it has. Further, only one of the stator passage and the rotor passage may be formed, and the one passage may be constituted by passage portions having different passage areas.
Each configuration described in the embodiment may be used alone or in combination of a plurality selected appropriately.

The present invention can also be configured as follows.
(Aspect 1)
It is a compressor as described in any one of Claims 1-5 , Comprising:
The compressor has a discharge port above the electric motor along the vertical direction and an oil reservoir below the compression mechanism.
In this aspect, preferably, a rotary type compression mechanism unit is used as the compression mechanism unit.

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, 420 Compression mechanism part 121, 221, 321, 421 Cylinder 122, 222, 322, 422 Eccentric rotor 123, 223, 323, 423 Compression chamber 124, 125, 224, 225, 324, 325, 424, 425 Bearing part 126, 226, 326, 426 Oil reservoir 130, 230, 330, 430 Accumulator 131, 231, 331, 431 Suction pipe 140, 240, 340, 440 Motor 141, 241, 341, 441 Air gap
150, 250, 350, 450 Stator 151, 251, 351, 451 Stator core 151a, 151c, 251a, 251c, 251e, 351a, 351c Outer peripheral wall 151b, 251b, 251d, 351b Connecting wall 152, 252, 352, 452 Stator winding 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, 370a, 370b passage portions 180, 280, 380, 480 Rotor passages 180a, 180b, 280a, 28 b, 280c, 380a, 380b passageway portion 181a, 181c, 281a, 281c, 281e, 381a, 381c passage wall 181b, 281b, 281d, 381b connecting wall 366 oil separator member (oil separator)
366a collision surface

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 Along the axial direction so as to communicate the stator, the rotor rotatable relative to the stator, and the compression mechanism side and the opposite side to the compression mechanism , while being disposed upward A compressor having a passage formed to move the working medium from the compression mechanism side to the opposite side of the compression mechanism ;
The passage is formed between a rotor passage formed in a rotor core forming the rotor of the motor and an outer peripheral surface of a stator core forming the stator of the motor and an inner peripheral surface of the container. Including at least one of the stator passages formed;
The compressor is characterized in 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 according to claim 1, wherein
  The passage is provided with a first passage portion having a first passage area, and a second passage area larger than the first passage area and disposed on the opposite side of the compression mechanism from the first passage portion. A compressor characterized by comprising a second passage portion. The compressor according to claim 2 , wherein
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 is arranged, connecting the first passage and area greater than the second passage wall forming the second passage portion having a second passage area, said first passage wall and the second passage wall A compressor characterized by comprising a connecting wall. A compressor according to claim 2 or 3 , wherein
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 parts and arranged on the opposite side, the second outer peripheral wall forming the second passage portion having a first passage area larger than the second passage area, the first outer peripheral wall and the second A compressor characterized by comprising a connecting wall connecting the outer peripheral walls of. A compressor according to any one of claims 1 to 4 , wherein
A compressor characterized in that an oil separation member is provided at a position opposite to the rotor mechanism from the rotor passage and facing the rotor passage. A container, a stator provided in the container, and a rotor rotatable relative to the stator, the axial direction communicating one side and the other side along the axial direction A motor having a passage formed along the axis, the working medium moving from the one side along the axial direction to the other side along the axial direction ;
The passage is a rotor passage formed in a rotor core forming the rotor, and a stator passage formed between an outer peripheral surface of a stator core forming the stator and an inner peripheral surface of the container. Including at least one of the
The motor according to claim 1, wherein the passage is formed such that a passage area of the other passage portion along the axial direction is larger than a passage area of the one passage portion along the axial direction.

Images