JP2016109067A - Compressor and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for reducing an amount of a lubricant mixed in a working medium discharged from a compressor.SOLUTION: A compressing mechanism portion 120 and a motor 140 are disposed in a sealed container 110. The motor 140 has a stator 150 and a rotor 170. A stator passage 180 is formed between an outer peripheral face of a stator core 160 of the stator 150 and an inner peripheral face 110a of the sealed container 110, and a rotor passage 190 is formed on a rotor core 172 of the rotor 170. An oil separation member (oil separator )176 is disposed on a part opposed to an opening portion of a rotor passage 190 at a side opposite to the compressing mechanism portion 120 with respect to the rotor passage 190. The rotor passage 190 is composed of a first passage part 190a, and a second passage part 190b disposed at a side opposite to the compressing mechanism portion 120 with respect to the first passage part 190a, and having a passage area smaller than a passage area of the first passage part 190a.SELECTED DRAWING: Figure 1

Description

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

An air conditioner (for example, an air conditioner or an air conditioner), a cooler or a refrigeration apparatus has a compressor for compressing a working medium (generally called “refrigerant”) that moves heat energy. I have. A compressor used in such an apparatus usually includes a compression mechanism portion and an electric motor (referred to as a “sealed compressor”) arranged in a sealed container. As the compressor, for example, a compressor having various structures such as a rotary compressor having a rotary type compression mechanism and a scroll type compressor having a scroll type compression mechanism is used.
Conventionally, for example, a compressor 600 as shown in FIG. The compressor 600 includes a sealed container 610, a compression mechanism unit 620 and an electric motor 640 disposed in the sealed container 610. A compressor 600 shown in FIG. 10 is configured as a rotary type compressor having a rotary type compression mechanism 620.
An electric motor 640 is arranged above the compression mechanism unit 620 along the vertical direction (vertical arrangement). A discharge port 612 is provided above the electric motor 640, and an oil sump 626 is provided below the compression mechanism 620. The oil sump 626 stores lubricating oil supplied to the bearing portions 624 and 625 of the rotating shaft 671, the sliding portion of the compression mechanism portion 620, and the like.
The electric motor 640 has a stator 650 and a rotor 670. A stator passage 680 is formed between the outer peripheral surface of the stator core 660 constituting the stator 650 and the inner peripheral surface of the sealed container 610 along the axial direction (extending direction of the rotating shaft 671). . A rotor passage 690 is formed in the rotor core 672 constituting the rotor 670 along the axial direction.
The working medium sucked through the suction port 611 is compressed by the compression mechanism 620 and then discharged from the discharge port 612 through the stator passage 680 and the rotor passage 690.
Here, a part of the lubricating oil supplied to the bearing portion or the like is scattered as oil droplets. When the working medium compressed by the compression mechanism unit 620 comes into contact with the oil droplet, the working medium captures the oil droplet. For this reason, the working medium mixed with lubricating oil is discharged from the discharge port 612. When the lubricating oil is discharged from the discharge port 612 together with the working medium, the lubricating oil stored in the oil sump 626 decreases, and there is a possibility that the oil runs out.
In the conventional compressor 600, the working fluid compressed by the compression mechanism 620 is passed through the stator passage 680 and the rotor passage 690, whereby the lubricating oil mixed in the working medium is separated, and the oil reservoir is collected by gravity or the like. 626.
In addition, an oil separation member (oil separator) 676 is disposed at a location opposite to the compression mechanism 620 from the rotor passage 690 and facing the opening of the rotor passage 690. The working medium that has passed through the rotor passage 690 hits the oil separation member 676 and the flow direction is changed. Thereby, the lubricating oil mixed in the working medium is separated and collected in the oil sump 626 by gravity or the like.
Note that a gap (air gap) 641 formed between the inner peripheral surface of the stator core 660 and the outer peripheral surface of the rotor core 672 also acts as a passage for the working medium.

JP-A-8-28476

In a conventional compressor, a rotor passage along the axial direction is formed in the rotor of the electric motor, and an oil separating member is provided on the opposite side of the compression mechanism portion of the rotor passage, so that it is mixed into the working medium. The lubricating oil is separated.
However, in the conventional compressor, the passage area of the rotor passage is constant, and the lubricating oil mixed in the working medium cannot be sufficiently separated.
The present invention has been made in view of such a point, and an object thereof is to provide a technique capable of reducing the amount of lubricating oil mixed in a working medium discharged from a discharge port.

The present invention is configured as follows.
The first invention relates to a compressor.
The compressor of the present invention includes a container, a compression mechanism section for compressing the working medium, and an electric motor for driving the compression mechanism section, which are provided in the container. The container is typically configured as a hermetically sealed container.
The electric motor has a stator and a rotor that can rotate relative to the stator. The electric motor has 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 in which a permanent magnet is inserted into a magnet insertion hole), an induction motor, and the like. An electric motor can be used.
As the compression mechanism section, compression mechanism sections having various configurations can be used, but typically, a rotary type compression mechanism section is used. When a rotary type compression mechanism is used, typically, the electric motor is arranged above the compression mechanism along the vertical direction.
The rotating shaft of the electric motor and the rotating shaft of the compression mechanism unit may be formed integrally or may be formed separately and connected.
A rotor passage is formed in the rotor along the axial direction so as to communicate the compression mechanism portion side of the electric motor with the side opposite to the compression mechanism portion. The description of “axial direction” represents a direction (extending direction) in which the rotor shaft constituting the rotor extends in a state where the rotor is rotatably supported relative to the stator. Yes. Further, an oil separation member is provided at a position opposite to the compression mechanism portion from the rotor passage and facing the opening of the rotor passage. As the oil separation member, a member having a collision surface on which the working medium that has passed through the rotor passage hits is used. The oil separation member is preferably arranged so as to be orthogonal (including “substantially orthogonal”) so that the collision surface intersects the extending direction of the rotor passage. The location where the oil separation member is attached and the method of attachment can be selected as appropriate.
Furthermore, the rotor passage of the present invention is formed such that the passage area of the passage portion on the side opposite to the compression mechanism portion is smaller than the passage area of the passage portion on the compression mechanism portion side. The passage area is an area of a cross section that intersects (typically orthogonal (including “substantially orthogonal”)) with the extending direction of the passage.
In the present invention, the rotor passage for passing the working medium is formed such that the passage area of the passage portion on the side opposite to the compression mechanism portion is smaller than the passage area of the passage portion on the compression mechanism portion side. When passing through the rotor passage, the speed of the working medium is increased by reducing the passage area. As a result, the working medium passing through the rotor passage strikes the collision surface of the oil separation member at a higher speed than when the passage area of the rotor passage is constant. Therefore, the effect of separating the lubricating oil mixed in the working medium by the oil separating member is improved, and the amount of lubricating oil mixed in the working medium discharged from the discharge port can be reduced.
In a different form of the first invention, the passage wall forming the rotor passage includes a first passage wall forming a first passage portion having a first passage area, and a compression mechanism portion than the first passage wall. A second passage wall that forms a second passage portion that is disposed opposite to the first passage area and has a second passage area that is smaller than the first passage area (second passage area <first passage area); It is comprised by the connection wall which connects 1 passage wall and 2nd 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 so as to be orthogonal (including “substantially orthogonal”) to the extending direction of the first passage wall. The connecting wall may be formed in a step shape (step shape) or an inclined shape. The passage wall forming the rotor passage may be constituted by three or more passage walls and two or more connection walls connecting the passage walls.
In this embodiment, when the working medium mixed with the lubricating oil passes through the rotor passage, the speed of the working medium can be increased efficiently.
In another different form of the first aspect of the invention, the compression mechanism portion side along the axial direction and the opposite side of the compression mechanism portion are communicated axially between the outer peripheral surface of the stator and the inner peripheral surface of the container. And a stator passage formed along the line. The shape of the stator passage can be set as appropriate.
In this embodiment, when the working medium passes through the stator passage, the lubricating oil mixed in the working medium is brought into contact with the outer peripheral surface of the stator and the inner peripheral surface of the container that form the stator passage. To be separated. Thereby, the amount of lubricating oil mixed in the working medium discharged from the discharge port can be further reduced.
In another different form of the first invention, the stator passage is formed such that the passage area of the passage portion on the side opposite to the compression mechanism portion is larger than the passage area of the passage portion on the compression mechanism portion side.
In this embodiment, since the stator passage is formed so that the passage area of the passage portion on the opposite side to the compression mechanism portion is larger than the passage area of the passage portion on the compression mechanism portion side, the working medium is contained in the stator passage. Is moved from the compression mechanism portion side to the opposite side of the compression mechanism portion, the moving area of the working medium is reduced by increasing the passage area. When the moving speed of the working medium decreases, small particles of the lubricating oil mixed in the working medium are combined with each other to form large particles. When 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 lubricating oil mixed in the working medium discharged from the discharge port can be further reduced.
In another different form of the first invention, the outer peripheral surface of the stator that forms the stator passage includes a first outer peripheral wall that forms a first passage portion having a first passage area, and a first outer periphery. A second passage portion is disposed on the opposite side of the compression mechanism portion from the wall and forms a second passage portion having a second passage area larger than the first passage area (second passage area> first passage area). It is comprised by the outer peripheral wall and the connection wall which connects a 1st outer peripheral wall and a 2nd outer peripheral 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 so as 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 shape (step shape) or an inclined shape. The outer peripheral wall that forms the stator passage may be constituted by three or more outer peripheral walls and two or more connecting walls that connect the outer peripheral walls.
In this embodiment, when the working medium mixed with the lubricating oil passes through the stator passage, the lubricating oil mixed in the working medium can be efficiently separated.

The second invention. The present invention relates to an electric motor used in a compressor.
The electric motor of the present invention includes a container, a stator provided in the container, and a rotor that can rotate relative to the stator. The rotor has a rotor passage formed along the axial direction so as to communicate one side and the other side along the axial direction. Further, an oil separation member is provided at a position facing the opening of the rotor passage on the other side along the axial direction from the rotor passage.
The container is typically configured as a hermetically sealed container. “One side” represents, for example, the compression mechanism portion side of the electric motor, and “the other side” represents, for example, the side opposite to the compression mechanism portion of the electric motor.
The electric motor according to the present invention includes a permanent magnet electric motor including a rotor provided with a permanent magnet (for example, a magnet embedded electric motor including a rotor in which a permanent magnet is inserted into a magnet insertion hole), an induction motor, and the like. It can be configured as an electric motor having a structure.
Furthermore, the rotor passage of the present invention is formed such that the passage area of the other passage portion along the axial direction is smaller than the passage area of the one passage portion along the axial direction.
In the present invention, typically, when the compression mechanism portion is arranged on one side along the axial direction from the electric motor, the working medium moves in the rotor passage from one side along the axial direction to the other side. In doing so, the movement speed of the working medium is increased by reducing the passage area. As a result, the working medium passing through the rotor passage strikes the collision surface of the oil separation member at a higher speed than when the passage area of the rotor passage is constant. Therefore, the effect of separating the lubricating oil mixed in the working medium by the oil separating member is improved, and the amount of lubricating oil mixed in the working medium discharged from the discharge port can be reduced.
In a different form of the second invention, the stator is formed along the axial direction so as to communicate the one side and the other side along the axial direction between the outer peripheral surface of the stator and the inner peripheral surface of the container. Has a passage.
In this embodiment, when the working medium passes through the stator passage, the lubricating oil mixed in the working medium is brought into contact with the outer peripheral surface of the stator and the inner peripheral surface of the container that form the stator passage. To be separated.
In another different form of the second invention, the stator passage is formed such that the passage area of the passage portion on the other side along the axial direction is larger than the passage area of the passage portion on the one side along the axial direction. ing.
In this embodiment, when the working medium moves from the one side along the axial direction in the stator passage to the other side, the moving area of the working medium decreases as the passage area increases. When the moving speed of the working medium decreases, small particles of the lubricating oil mixed in the working medium are combined with each other to form large particles. When 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 using the compressor and electric 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 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 2nd 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 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 compressor of 4th Embodiment. It is the elements on larger scale which expanded the part of the electric motor of FIG. It is the elements on larger scale which expanded the part of the electric motor used with the compressor of 5th Embodiment. It is a schematic block diagram of the conventional compressor.

Embodiments of the present invention will be described below with reference to the drawings.
In this specification, the term “axial direction” refers to the direction in which the rotating shaft that constitutes the rotor extends (extension) in a state where the rotor of the electric motor is rotatably supported with respect to the stator. Direction).
In addition, the description of “upper” or “upper” indicates the upper or upper side in the vertical direction unless otherwise specified, and the description of “lower” or “lower” indicates that there is no particular notice. Represents the lower or 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 illustrating a schematic configuration of a compressor 100 according to the first embodiment. FIG. 2 is an enlarged view of a portion of the electric motor 140 of FIG. That is, FIG. 2 is a diagram showing a schematic configuration of the first embodiment of the electric 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 is disposed in a hermetic container.
The compressor 100 includes an airtight container 110, a compression mechanism unit 120 accommodated in the airtight container 110, an electric motor 140, an accumulator 130, and the like. In the present embodiment, the electric motor 140 is disposed above the compression mechanism unit 120 along the vertical direction.
The airtight container 110 is provided with a suction port 111 below the electric motor 140 and a discharge port 112 above the electric motor 140. In addition, an oil sump 126 in which lubricating oil supplied to the bearing portions 124 and 125 of the rotating shaft 171, the sliding portion of the compression mechanism portion 120, and the like is stored at the bottom of the sealed container 110 (below the compression mechanism portion 120). Is provided.
The sealed container 110 corresponds to the “container” of the present invention.

The compression mechanism unit 120 compresses a working medium (generally called “refrigerant”) that moves thermal energy. As the working medium, an HFC (hydrofluorocarbon) refrigerant having an ozone depletion potential (ODP) of zero, for example, HFC-R410a is used. In recent years, HFC-R32 having a global warming potential (GWP) smaller than HFC-R410a (about 1/3) has been used.
The compression mechanism unit 120 includes a cylinder 121, an eccentric rotor 122 rotated by a rotation shaft 171, and a compression chamber 123. The rotating shaft 171 is rotatably supported by the bearing portions 124 and 125. When the eccentric rotor 122 of the compression mechanism unit 120 is rotated by the rotation of the rotation shaft 171, the working medium sucked from the suction port 111 is compressed in the compression chamber 123.
Note that the lubricating oil stored in the oil sump 126 is supplied to the bearing portions 124 and 125, the sliding portion of the compression mechanism portion 120, and the like by the rotation of the rotating shaft 171. The lubricating oil that has lubricated the bearing portions 124 and 125 and the sliding portion is returned to the oil sump 126.

The electric motor 140 includes a stator 150 and a rotor 170 that is rotatably supported with respect to the stator 150.
The stator 150 has a stator core 160 and a stator winding 151. The stator core 160 is formed by laminating a plurality of thin plate-shaped electromagnetic steel plates. The stator core 160 is a slot formed by a yoke extending along the circumferential direction, a tooth extending radially from the yoke toward the center side, and teeth adjacent in the circumferential direction when viewed in a cross section perpendicular to the axial direction. have. The stator winding 151 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 160 (virtual outer peripheral shape in which notches are not formed) are formed in appropriate shapes including a circular shape.

On the outer peripheral side of the stator core 160, cutout portions extending along the axial direction are formed at appropriate locations along the circumferential direction. By this notch, the lower end surface 160A and the upper end surface 160B of the stator core 160 communicate with each other between the outer peripheral surface of the stator core 160 and the inner peripheral surface 110a of the sealed container 110 (the stator core 160 A stator passage 180 (communicating between the compression mechanism 120 side and the opposite side of the compression mechanism 120) is formed along the inner peripheral surface 110a of the hermetic container 110.
In the present embodiment, the outer peripheral surface of the stator core 160 forming the stator passage 180 is formed by an outer peripheral surface 160a that extends parallel to the axial direction (including “substantially parallel”).
As a result, the stator passage 180 having a passage portion having the same passage area between the outer peripheral surface of the stator core 160 and the inner peripheral surface 110a of the hermetic container 110 extends along the axial direction (the axis of the stator core 160). The two end faces 160A and 160B along the direction are formed to communicate with each other. The passage area is an area of a cross section that intersects (typically orthogonal (including “substantially orthogonal”)) with the extending direction of the passage (passage portion).
The stator passage 180 is formed along the axial direction so that the compression mechanism portion side and the opposite side of the compression mechanism portion communicate with each other between the outer peripheral surface of the stator and the inner peripheral surface of the container of the present invention. "Stator passage" or "stator passage formed along the axial direction between the outer peripheral surface of the stator and the inner peripheral surface of the container so as to communicate one side and the other side along the axial direction" Correspond.

The rotor 170 includes a rotation shaft 171 and a rotor core 172.
Rotor core 172 has a cylindrical shape and is formed by laminating a plurality of plate-shaped electromagnetic steel plates. End plates 173 and balance weights 174 are disposed at both axial ends of the laminate. And the laminated body, the end plate 173, and the balance weight 174 are integrated by the crimping pin 175 inserted in the crimping pin insertion hole. The rotor core 172 is rotatably disposed on the inner peripheral side of the stator core 160 in a state where the rotation shaft 171 is inserted into the rotation shaft insertion hole. As a result, a gap (air gap) 141 along the axial direction is formed between the inner peripheral surface of the stator core 160 and the outer peripheral surface of the rotor core 172.
In addition, although illustration is abbreviate | omitted, the magnet insertion hole is formed in the rotor core 172, and the permanent magnet is inserted in the magnet insertion hole.

The lower end surface 172A and the upper end surface 172B of the rotor core 172 communicate with the rotor core 172 at appropriate locations along the circumferential direction (the compression mechanism portion 120 side of the rotor core 172 and the compression mechanism portion). A rotor passage 190 (communication on the opposite side to 120) is formed.
In the present embodiment, the rotor passage 190 includes a first passage wall 191a, a second passage wall 191c disposed above the first passage wall 191a (on the side opposite to the compression mechanism portion 120), and a first passage wall 191c. It is formed by a connecting wall 191b that connects the first passage wall 191a and the second passage wall 191c. The first passage wall 191a forms a first passage portion 190a having a first passage area 190t1. The second passage wall 191c forms a second passage portion 190b having a second passage area 190t2 (190t2 <190t1) smaller than the first passage area 190t1. In this embodiment, since the rotor passage 190 having a circular cross-sectional shape is used, the inner diameter of the second passage portion 190b is set to be smaller than the inner diameter of the first passage portion 190a. In the present embodiment, the first passage wall 191a and the second passage wall 191c are formed to extend parallel to the axial direction (including “substantially parallel”), and the connection wall 191b is the first passage wall. It is formed so as to be orthogonal to the extending direction of 191a (including “substantially orthogonal”).
As a result, the rotor core 172 is disposed on the first passage portion 190a having the first passage area 190t1 and above the first passage portion 190a (on the side opposite to the compression mechanism portion 120). The rotor passage 190 constituted by the second passage portion 190b having the second passage area 190t2 (190t2 <190t1) smaller than the area 190t1 is along the axial direction (both end surfaces along the axial direction of the rotor core 172). 172A and 172B in communication). In addition, when the rotor passage 190 is blocked by the end plate 173, a through hole is formed at a location facing the rotor passage 190 of the end plate 173.
The rotor passage 190 of the present invention is “the rotor passage formed along the axial direction so as to communicate with the rotor on the compression mechanism portion side and the opposite side of the compression mechanism portion” or “the rotor in the axial direction. Corresponds to a rotor passage formed along the axial direction so as to communicate one side and the other side.
The first passage portion 190a and the second passage portion 190b correspond to the “first passage portion of the rotor passage” and the “second passage portion of the rotor passage” of the present invention, and the first passage wall. The 191a, the second passage wall 191c, and the connection wall 191b correspond to the “first passage wall of the rotor”, the “second passage wall of the rotor”, and the “connection wall of the rotor” of the present invention.

In addition, an oil separating member (oil separator) 176 is disposed on the rotor 170 at a location above the rotor passage 190 (on the side opposite to the compression mechanism portion 120) and facing the opening of the rotor passage 190. . The oil separating member 176 is provided to separate the lubricating oil mixed in the working medium that has passed through the rotor passage 190.
In the present embodiment, the oil separation member 176 is formed as a disk-shaped plate member, and is integrated with the laminate, the end plate 173 and the balance weight 174 by caulking pins 175. The oil separation member 176 is arranged so that the working medium that has passed through the rotor passage 190 hits the collision surface 176a of the oil separation member 176. In the present embodiment, the oil separation member 176 is disposed so that the collision surface 176a extends in a direction orthogonal to the axial direction (including “substantially orthogonal”). In addition, a spacer 177 is provided between the oil separation member 176 and the end plate 173 in order to form a space having a predetermined size between the oil separation member 176 and the end plate 173.

The accumulator 130 separates the lubricating oil mixed in the working medium discharged from the discharge port 112. The working medium from which the lubricating oil has been separated by the accumulator 130 is returned to the compression mechanism unit 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 sump 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 151 by supplying current to the stator winding 151 and the rotor 170 (rotating shaft 171) rotates, the working medium sucked from the suction port 111 is compressed by the compression mechanism 120. Compressed.
The working medium compressed by the compression mechanism 120 is a stator passage 180 formed between the outer peripheral surface of the stator core 160 and the inner peripheral surface 110a of the hermetic container 110, and the rotor formed in the rotor core 172. Passing through the gap 190 (air gap) 141 formed between the inner peripheral surface of the passage 190 and the stator core 160 and the outer peripheral surface of the rotor core 172, from the lower side (compression mechanism 120 side) of the electric motor 140 to the upper side (compression) It flows to the opposite side of the mechanism portion 120 and is discharged from the discharge port 112.

Here, in the lower space of the electric motor 140, a part of the lubricating oil is scattered as oil droplets. For this reason, when the working medium moves from the compression mechanism 120 to the electric motor 140, the working medium and the oil droplet come into contact with each other, the working medium captures the oil droplet, and the lubricating oil is mixed into the working medium.
In the present embodiment, the working medium mixed with lubricating oil is passed through the stator passage 180 and the rotor passage 190. Thus, in the stator passage 180 and the rotor passage 190, the working medium mixed with the lubricating oil comes into contact with the outer peripheral wall forming the stator passage and the passage wall forming the rotor passage. The mixed lubricating oil is separated and returned to the oil sump 126 by gravity or the like.

In addition, the working medium that has passed through the rotor passage 190 strikes the collision surface 176 a of the oil separation member 176. When the working medium hits the collision surface 176a, the lubricating oil mixed in the working medium is separated.
In addition, the working medium moves along the collision surface 176a in the outer circumferential direction (outer circumferential direction along the radial direction) by the rotation of the rotor 170. Thereby, the lubricating oil mixed in the working medium is separated by the centrifugal force.

Further, in the present embodiment, the rotor passage 190 is disposed above the first passage portion 190a having the first passage area 190t1 and above the first passage portion 190a (on the opposite side to the compression mechanism portion 120). The second passage portion 190b has a second passage area 190t2 smaller than the first passage area 190t1. Accordingly, when the working medium flows in the rotor passage 190 from the compression mechanism part 120 side to the opposite side to the compression mechanism part 120, the speed of the working medium is increased (accelerated) by reducing the passage area. Then, after the speed of the working medium increases (accelerated) in the rotor passage 190, the working medium strikes the collision surface 176a of the oil separation member 176. Therefore, compared with the case where the passage area of the rotor passage 190 is constant, the separation effect of the lubricating oil mixed in the working medium due to the working medium hitting the collision surface 176a of the oil separating member 176 is improved.
Note that the position and number of the stator passages 180 and the shape of the stator passage 180 are appropriately set in consideration of the magnetic circuit of the stator core 160, the separation effect of the lubricating oil mixed in the working medium, and the like. Further, the position and number of the rotor passage 190, the first passage area 190t1 of the first passage portion 190a of the rotor passage 190, and the second passage area 190t2 of the second passage portion 190b are determined by the rotor core 172. It is set as appropriate 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 passage area of the stator passage 180 is constant, but may be configured by a plurality of passage portions having different passage areas.
A compressor according to a second embodiment in which the stator passage and the rotor passage are configured by two passage portions having different passage areas (the number of steps is set to one) will be described with reference to FIGS. 3 and 4. To do. FIG. 3 is a diagram illustrating a schematic configuration of the compressor 200 according to the second embodiment. FIG. 4 is an enlarged view of the electric motor 240 shown in FIG. That is, FIG. 4 is a diagram showing a schematic configuration of the second embodiment of the electric motor of the present invention.

3 and FIG. 4, the constituent elements having the same reference numerals other than the hundreds and the reference numerals assigned to the constituent elements shown in FIGS. 1 and 2 represent the same constituent elements.
The compressor 200 according to the second embodiment has the same configuration except that the configuration of the stator passage 280 is different from the stator passage 180 of the compressor 100 according to the first embodiment.
Therefore, only the stator passage 280 of the compressor 200 according to the second embodiment will be described below.

On the outer peripheral side of the stator core 260, cutout portions extending along the axial direction are formed at appropriate locations along the circumferential direction. By this notch, the lower end surface 260A and the upper end surface 260B of the stator core 260 communicate with each other between the outer peripheral surface of the stator core 260 and the inner peripheral surface 210a of the hermetic container 210 (the stator core 260 A stator passage 280 (which communicates the compression mechanism 220 side and the opposite side of the compression mechanism 220) is formed along the inner peripheral surface 210 a of the sealed container 210.
In the present embodiment, the outer peripheral surface of the stator core 260 forming the stator passage 280 is above the first outer peripheral wall 260a forming the first passage portion 280a and the first outer peripheral wall 260a (compression mechanism). And a second outer peripheral wall 260c that forms the second passage portion 280b, and a connecting wall 260b that connects the first outer peripheral wall 260a and the second outer peripheral wall 260c. ing. In the present embodiment, the first outer peripheral wall 260a and the second outer peripheral wall 260c are formed to extend parallel to the axial direction (including “substantially parallel”), and the connecting wall 260b is the first outer peripheral wall. It is formed to be orthogonal to the extending direction of 260a (including “substantially orthogonal”). The first outer peripheral wall 260a and the second outer peripheral wall 260c are such that the distance between the second outer peripheral wall 260c and the inner peripheral surface 210a of the sealed container 210 is the inner peripheral surface of the first outer peripheral wall 260a and the sealed container 210. It is formed in a stepped shape (stepped shape) along the axial direction so as to be larger than the interval with 210a.
Accordingly, the first passage portion 280a having the first passage area 280t1 between the outer peripheral surface of the stator core 260 and the inner peripheral surface 210a of the hermetic container 210, and above the first passage portion 280a (compression) A stator passage 280 formed by a second passage portion 280b disposed on the opposite side of the mechanism portion 220 and having a second passage area 280t2 (280t2> 280t1) larger than the first passage area 280t1 is provided in the axial direction. Along both ends (260A and 260B along the axial direction of the stator core 260).
The stator passage 280 of the present invention is formed along the axial direction so that the compression mechanism portion side and the opposite side of the compression mechanism portion communicate with each other between the outer peripheral surface of the stator and the inner peripheral surface of the container. "Stator passage" or "stator passage formed along the axial direction between the outer peripheral surface of the stator and the inner peripheral surface of the container so as to communicate one side and the other side along the axial direction" Correspond.
The first passage portion 280a and the second passage portion 280b correspond to the “first passage portion of the stator passage” and the “second passage portion of the stator passage” of the present invention, and the first outer peripheral wall. The 260a, the second outer peripheral wall 260c, and the connecting wall 260b 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” of the present invention.

In the present embodiment, the stator passage 280 is disposed in order from the compression mechanism portion 220 side to the opposite side of the compression mechanism portion 220, and the first passage portion 280a having the first passage area 280t1 and the second passage portion 280a. The second passage portion 280b has a passage area 280t2 (280t2> 280t1).
Thereby, when the working medium moves in the stator passage 280 from the compression mechanism section 220 side to the opposite side to the compression mechanism section 220, the movement area of the working medium decreases (decelerates) by increasing the passage area. . When the moving speed of the working medium decreases, small particles of the lubricating oil mixed in the working medium are combined with each other to form large particles. When 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, the amount of lubricating oil mixed in the working medium discharged from the discharge port 212 can be further reduced.
Note that the position and number of the stator passages 280, the first passage area 280t1 of the first passage portion 280a of the stator passage 280, and the second passage area 280t2 of the second passage portion 280b depend on the stator core 260. It is set as appropriate in consideration of the separation effect of the lubricating oil mixed in the magnetic circuit and the working medium. Further, the position and number of the rotor passage 290, the first passage area 290t1 of the first passage portion 290a of the rotor passage 290, and the second passage area 290t2 of the second passage portion 290b are determined by the rotor core 272. It is set as appropriate 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 rotor passage 190 is configured by two passage portions having different passage areas (the number of steps is set to one), but three or more passage portions having different passage areas are provided. (Can be set to two or more stages).
A compressor according to a third embodiment in which the rotor passage is configured by three passage portions having different passage areas (the number of steps is set to two) will be described with reference to FIGS. 5 and 6. FIG. 5 is a diagram illustrating a schematic configuration of a compressor 300 according to the third embodiment. FIG. 6 is an enlarged view of a portion of the electric motor 340 in FIG. That is, FIG. 6 is a diagram showing a schematic configuration of the third embodiment of the electric motor of the present invention.

5 and FIG. 6, the constituent elements to which the same reference numerals are assigned except the hundreds and the reference numerals assigned to the constituent elements shown in FIG. 1 and FIG. 2 represent the same constituent elements.
The compressor 300 of the third embodiment is the same in other configurations except that the configuration of the rotor passage 390 is different from the rotor passage 190 of the compressor 100 of the first embodiment.
Therefore, only the rotor passage 390 of the compressor 300 of the third embodiment will be described below.

The lower end surface 372A and the upper end surface 372B of the rotor core 372 are communicated with the rotor core 372 at appropriate locations along the circumferential direction (the compression mechanism portion 320 side of the rotor core 372 and the compression mechanism portion). A rotor passage 390 (which communicates with the side opposite to 320) is formed.
The rotor passage 390 includes a first passage wall 391a, a second passage wall 391c disposed above the first passage wall 391a (on the side opposite to the compression mechanism section 320), and a second passage wall 391c. A third passage wall 391e disposed on the upper side (opposite to the compression mechanism section 320), a first connection wall 391b for connecting the first passage wall 391a and the second passage wall 391c, and a second It is formed by a second connecting wall 391d that connects the passage wall 391c and the third passage wall 391e. The first passage wall 391a forms a first passage portion 390a having a first passage area 390t1. The second passage wall 391c forms a second passage portion 390b having a second passage area 390t2 (390t2 <390t1) that is smaller than the first passage area 390t1. The third passage wall 391e forms a third passage portion 390c having a third passage area 390t3 (390t3 <390t2) that is smaller than the second passage area 390t2. In the present embodiment, the first passage wall 391a, the second passage wall 391c, and the third passage wall 391e are formed so as to extend parallel to the axial direction (including “substantially parallel”). The connecting wall 391b is formed so as to be orthogonal (including “substantially orthogonal”) to the extending direction of the first passage wall 391a, and the second connecting wall 391d is connected to the extending direction of the second passage wall 391c. It is formed to be orthogonal (including “substantially orthogonal”).
As a result, the rotor core 372 is disposed on the first passage portion 390a having the first passage area 390t1 and above the first passage portion 390a (on the side opposite to the compression mechanism portion 320). A second passage portion 390b having a second passage area 390t2 (390t2 <390t1) smaller than the area 390t1, and a second passage portion disposed above the second passage portion 390b (on the side opposite to the compression mechanism section 320). A rotor passage 390 constituted by a third passage portion 390c having a third passage area 390t3 (390t3 <390t2) smaller than the area 390t2 is provided along the axial direction (both end surfaces along the axial direction of the rotor core 372). 372A and 372B in communication).

In the present embodiment, the rotor passage 390 is arranged in order from the compression mechanism portion 320 side to the opposite side of the compression mechanism portion 320, and the first passage portion 390a having the first passage area 390t1 and the second passage portion 390a. The second passage portion 390b has a passage area 390t2 (390t2 <390t1), and the third passage portion 390c has a third passage area 390t3 (390t3 <390t2).
Thereby, when the working medium moves from the first passage portion 390a of the rotor passage 390 to the second passage portion 390b and when it moves from the second passage portion 390b to the third passage portion 390c, the passage area is increased. The movement speed of the working medium is increased by decreasing the value of. That is, when the working medium moves in the rotor passage 390 from the compression mechanism section 320 side to the opposite side to the compression mechanism section 320, the operation medium moving speed increases (acceleration operation) is performed a plurality of times. Can further increase the speed at which the oil hits the collision surface 376a of the oil separation member 376.
Therefore, in the present embodiment, the amount of lubricating oil mixed in the working medium discharged from the discharge port 312 can be further reduced.

In the compressor 300 according to the third embodiment, the passage area of the stator passage 380 is constant, but may be configured by a plurality of passage portions having different passage areas.
A compressor according to a fourth 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) will be described with reference to FIGS. 7 and 8. To do. FIG. 7 is a diagram illustrating a schematic configuration of a compressor 400 according to the fourth embodiment. FIG. 8 is an enlarged view of the electric motor 440 in FIG. That is, FIG. 8 is a diagram showing a schematic configuration of the fourth embodiment of the electric motor of the present invention.

7 and 8, the constituent elements to which the same reference numerals are assigned except the hundreds and the reference numerals assigned to the constituent elements shown in FIGS. 5 and 6 represent the same constituent elements.
The compressor 400 of the fourth embodiment is the same in other configurations except that the configuration of the stator passage 480 is different from the stator passage 380 of the compressor 300 of the third embodiment.
Therefore, only the stator passage 480 of the compressor 400 according to the fourth embodiment will be described below.

In the present embodiment, the outer peripheral surface of the stator core 460 forming the stator passage 480 is above the first outer peripheral wall 460a forming the first passage portion 480a and the first outer peripheral wall 460a (compression mechanism). The second outer peripheral wall 460c that forms the second passage portion 480b, and the second outer peripheral wall 460c (on the opposite side to the compression mechanism section 420), A third outer peripheral wall 460e forming the passage portion 480c, a first connecting wall 460b connecting the first outer peripheral wall 460a and the second outer peripheral wall 460c, a second outer peripheral wall 460c and a third It has the 2nd connection wall 460d which connects the outer peripheral wall 460e. In the present embodiment, the first outer peripheral wall 460a, the second outer peripheral wall 460c, and the third outer peripheral wall 460e are formed to extend parallel to the axial direction (including “substantially parallel”), The connecting wall 460b and the second connecting wall 460d are formed so as to be orthogonal (including “substantially orthogonal”) to the axial direction. The first outer peripheral wall 460a, the second outer peripheral wall 460c, and the third outer peripheral wall 460e are spaced apart from the first outer peripheral wall 460a by the distance between the second outer peripheral wall 460c and the inner peripheral surface 410a of the sealed container 410. The distance between the inner peripheral surface 410a of the sealed container 410 is larger than the distance between the third outer peripheral wall 460e and the inner peripheral surface 410a of the sealed container 410, and the inner space between the second outer peripheral wall 460c and the sealed container 410 is larger. It is formed in a step shape (step shape) along the axial direction so as to be larger than the distance between the peripheral surface 410a.
Thereby, between the outer peripheral surface of the stator core 460 and the inner peripheral surface 410a of the sealed container 410, the first passage portion 480a having the first passage area 480t1 and the first passage portion 480a above (compressed) A second passage portion 480b having a second passage area 480t2 larger than the first passage area 480t1 and disposed above the second passage portion 480b (opposite to the compression mechanism portion 420). And a stator passage 480 formed by a third passage portion 480c having a third passage area 480t3 larger than the second passage area 480t2 is formed along the axial direction.

In the present embodiment, when the working medium moves from the first passage portion 480a of the stator passage 480 to the second passage portion 480b and when it moves from the second passage portion 480b to the third passage portion 480c. As the passage area increases, the moving speed of the working medium decreases (decelerates). That is, when the working medium moves in the stator passage 480 from the compression mechanism unit 420 side to the opposite side to the compression mechanism unit 420, the operation medium moving speed lowering operation (deceleration operation) is performed a plurality of times.
Therefore, the amount of lubricating oil mixed into the working medium discharged from the discharge port 412 can be further reduced.

In the first to fourth embodiments, the oil separation member is integrated with the laminate, the end plate, and the balance weight by the caulking pin, but the attachment location and the attachment method of the oil separation member are not limited thereto.
A compressor according to a fifth embodiment will be described with reference to FIG. Note that the compressor of the fifth embodiment is different from the compressors of the other embodiments only in the mounting location and mounting method of the oil separation member, so FIG. 9 shows the fifth embodiment. Only the electric motor used in the compressor of the form is shown. FIG. 9 is a diagram showing a schematic configuration of the fifth embodiment of the electric motor of the present invention.
In the present embodiment, oil separation member 576 is attached to rotating shaft 571 constituting rotor 570 of electric motor 540.
In the present embodiment, the oil separating member 576 can be attached separately from the operation of integrating the laminate, the end plate 573 and the balance weight 574 with the caulking pin 575.

The present invention is not limited to the configuration described in the embodiment, and various changes, additions and deletions are possible.
In the embodiment, the magnet embedded type electric motor in which the permanent magnet is inserted into the magnet insertion hole formed in the rotor core has been described. However, the electric motor of the present invention includes an airtight container, a rotor, a stator, and a stator. It is sufficient if at least one of the passage and the rotor passage is provided, and the type of the motor and the specific configuration of each component can be variously changed.
Although the rotary type compression mechanism unit has been described in the embodiment, the compressor mechanism unit is not limited to the rotary type compression mechanism unit, and various types of compression mechanism units can be used.
The oil separation member only needs to change the flow direction of the working medium when the working medium that has passed through the rotor passage hits the collision surface, and the shape of the oil separation member, the shape of the collision surface, and the arrangement mode of the collision surface with respect to the rotor passage, The attachment position and attachment method of the oil separation member can be variously changed.
The number of steps in the stator passage and the number of steps in the rotor passage may be one step or two or more steps. Further, the number of steps in the stator passage and the number of steps in the rotor passage may be different.
The stator passage and the rotor passage are preferably formed in steps, but may be formed in other shapes.
The connecting wall forming the stator passage is preferably formed so as to be orthogonal (including “substantially orthogonal”) to the extending direction of the outer peripheral wall on the compression mechanism portion side (one side along the axial direction) You may form in shapes other than this, for example, inclination. Further, the connecting wall forming the rotor passage is preferably formed so as to be orthogonal (including “substantially orthogonal”) to the extending direction of the passage wall on the compression mechanism portion side (one side along the axial direction). However, you may form in shapes other than this, for example, inclination.
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 circularly or linearly along the circumferential direction, or a shape (circular shape or polygonal shape) corresponding to the inner peripheral surface of the sealed container is cut linearly or curvedly. It can be set to a missing shape.
The arrangement position and number of stator passages and rotor passages can be set as appropriate.
The present invention only needs to include a rotor passage and an oil separation member, and the stator passage can be omitted.
Each structure demonstrated by embodiment may be used independently, and may be used combining the several selected suitably.

The present invention can also be configured as follows.
(Aspect 1)
It is a compressor as described in any one of Claims 1-4, Comprising:
The electric motor is disposed above the compression mechanism along the vertical direction,
The said container has a discharge outlet above the said electric motor along a perpendicular direction, and has a sump below the said compression mechanism part, The compressor characterized by the above-mentioned.
In this aspect, a rotary type compression mechanism is preferably used as the compression mechanism.

100, 200, 300, 400, 600 Compressor 110, 210, 310, 410, 510, 610 Airtight container 111, 211, 311, 411, 611 Suction port 112, 212, 312, 412, 612 Discharge port 120, 220, 320, 420, 620 Compression mechanism 121, 221, 321, 421, 621 Cylinder 122, 222, 322, 422, 622 Eccentric rotor 123, 223, 323, 423, 623 Compression chamber 124, 125, 224, 225, 324, 325, 424, 425, 624, 625 Bearing portion 126, 226, 326, 426, 626 Oil sump 130, 230, 330, 430, 630 Accumulator 131, 231, 331, 431, 631 Suction pipe 140, 240, 340, 440 540, 640 Electric motor 141, 2 41, 341, 441, 541, 641 Air gap
150, 250, 350, 450, 550, 650 Stator 151, 251, 351, 451, 551, 651 Stator winding 160, 260, 360, 460, 560, 660 Stator core 160a, 260a, 260c, 360a, 460a, 460c, 460e, 560a Outer peripheral wall 170, 270, 370, 470, 570, 670 Rotor 171, 271, 371, 471, 571, 671 Rotating shaft 172, 272, 372, 472, 572, 672 Rotor core 173 273, 373, 473, 573, 673 End plates 174, 274, 374, 474, 574, 674 Balance weights 175, 275, 375, 475, 575, 675 Caulking pins 176, 276, 376, 476, 576, 676 Oil separation Member (oil separator)
176a, 276a, 376a, 476a, 576a Colliding surface 177, 277, 377, 477, 677 Spacer 180, 280, 380, 480, 580, 680 Stator passage 190, 290, 390, 490, 590, 690 Rotor passage 190a , 190b, 290a, 290b, 390a, 390b, 390c, 490a, 490b, 490c, 590a, 590b passage portion 191a, 191c, 291a, 291c, 391a, 391c, 391e, 491a, 491c, 491e, 591a, 591c passage wall 191b , 291b, 391b, 391d, 491b, 491d, 591b Connecting wall 260b, 460b, 460d Connecting wall 280a, 280b, 480a, 480b, 480c

Claims (8)

A container, a compression mechanism portion for compressing the working medium, and an electric motor for driving the compression mechanism portion provided in the container, the electric motor being relative to the stator and the stator And a rotor passage formed along an axial direction so as to communicate between the compression mechanism portion side and the opposite side of the compression mechanism portion; and The compressor is provided with an oil separation member at a position opposite to the rotor passage on the side opposite to the compression mechanism portion from the rotor passage,
The compressor passage is formed so that a passage area of a passage portion on the opposite side to the compression mechanism portion is smaller than a passage area of a passage portion on the compression mechanism portion side. The compressor according to claim 1,
A passage wall forming the rotor passage is disposed on the opposite side of the compression mechanism portion from the first passage wall forming a first passage portion having a first passage area, and the first passage wall. A second passage wall forming a second passage portion having a second passage area smaller than the first passage area, and a connecting wall connecting the first passage wall and the second passage wall. A compressor characterized in that it is configured. The compressor according to claim 1 or 2,
Between the outer peripheral surface of the stator and the inner peripheral surface of the container, there is a stator passage formed along the axial direction so as to communicate the compression mechanism portion side and the opposite side of the compression mechanism portion. The compressor characterized by having. The compressor according to claim 3, wherein
The stator passage is formed so that a passage area of a passage portion on the side opposite to the compression mechanism portion is larger than a passage area of a passage portion on the compression mechanism portion side. A compressor according to claim 4,
The outer peripheral surface of the stator forming the stator passage is opposite to the compression mechanism portion from 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 disposed on a side and forming a second passage portion having a second passage area larger than the first passage area, and connecting the first outer peripheral wall and the second outer peripheral wall A compressor characterized by comprising a connecting wall. A container, a stator provided in the container, and a rotor that can rotate relative to the stator, and the rotor communicates with one side and the other side along an axial direction; A rotor passage formed along the axial direction, and an oil separating member is provided at a position facing the rotor passage on the other side along the axial direction from the rotor passage. An electric motor,
The rotor passage is formed such that a passage area of the other passage portion along the axial direction is smaller than a passage area of the one passage portion along the axial direction. . The electric motor according to claim 6,
Between the outer peripheral surface of the stator and the inner peripheral surface of the container, there is a stator passage formed along the axial direction so as to communicate the one side and the other side along the axial direction. An electric motor characterized by that. The electric motor according to claim 7,
The stator passage is formed so that a passage area of the passage portion on the other side along the axial direction is larger than a passage area of the passage portion on the one side along the axial direction. .

Images