JP2016135049A - Hermetically sealed rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a heat removal function without requiring complicated processing for a hermetically sealed rotary electric machine.SOLUTION: The hermetically sealed rotary electric machine comprises: a rotor including a rotor shaft and a rotor core; a stator including a stator core and a stator coil; a frame; and an external cooling structure 110. The external cooling structure 110 includes: a cooling part cover which is arranged oppositely to the frame while interposing an interval therebetween, covers a cylindrical portion of the frame and forms a hermetically sealed space 118 together with the frame; and a partition member 112 which connects an inner surface of the cooling part cover and an outer surface of the frame, partitions the inside of the hermetically sealed space 118 and forms a channel for a coolant. Further, an injection part 115 is formed for a coolant from the outside and in an exit of the channel, a discharge part 116 is formed for the coolant toward the outside.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a hermetic rotary electric machine that is cooled from the outside.

  A current corresponding to the output flows through the stator coil of the rotating electric machine. Copper loss due to Joule heat occurs due to current flow. An insulator for preventing a short circuit is provided between the conductors of the stator coil, or between the conductors of the stator coil and the structures such as the stator core and the support portion.

  Insulator materials differ for each insulation grade depending on temperature conditions. In order to secure the insulation function of the insulator with a margin, it is important to cool the stator.

  As a technique for cooling the stator of a hermetic rotary electric machine from the outside, an example in which a cooling hole is provided in the thickness of the frame is known (Patent Document 1). Further, a technique is known in which a groove through which a cooling medium passes is provided on the inner surface of a frame (Patent Document 2).

Japanese Patent No. 3690920 Utility Model Registration No. 2513586

  The technology of providing a cooling hole in the frame and the technology of providing a groove through which the cooling medium passes in the frame require processing of the frame, which is not preferable from the viewpoint of economy. Moreover, it cannot be said from the viewpoint of ensuring a sufficient heat transfer area.

  Therefore, an object of the present invention is to secure a heat removal function without requiring complicated processing for a hermetic rotary electric machine.

  In order to achieve the above-described object, a hermetic rotary electric machine according to the present invention includes a rotor having an axially extending rotor shaft, and a rotor core provided radially outside the rotor shaft, and the rotating A stator core provided on the outer side in the radial direction of the core and laminated with steel sheets for iron core; a stator having a stator coil installed in a slot formed in the stator core; and the stator and A frame that accommodates the rotor core and extends in a cylindrical shape, and an external cooling structure that is provided on the outer side in the radial direction of the frame and cools the frame from the outside, the external cooling structure, A cooling part cover which is arranged so as to face the frame at an interval and covers the cylindrical part of the frame to form a sealed space together with the frame; an inner surface of the cooling part cover; And a partition member that partitions the inside of the sealed space to form a coolant flow path, and an external coolant injection portion is formed, and an external portion is formed at the outlet of the flow path. A cooling material discharge portion is formed.

  ADVANTAGE OF THE INVENTION According to this invention, about a sealed rotary electric machine, a heat removal function is securable without requiring a complicated process.

1 is an elevational sectional view showing a configuration of a hermetic rotary electric machine according to a first embodiment. 1 is a side view of a hermetic rotary electric machine according to a first embodiment. It is an expanded view of the circumferential direction of the external cooling structure of the hermetic rotary electric machine of the first embodiment. It is a side view of the enclosed rotary electric machine which concerns on 2nd Embodiment. It is an expanded view of the circumferential direction of the external cooling structure of the hermetic rotary electric machine of the second embodiment. It is a side view of the enclosed rotary electric machine which concerns on 3rd Embodiment. It is an expanded view of the circumferential direction of the external cooling structure of the hermetic rotary electric machine of the third embodiment. It is a side view of the enclosed rotary electric machine which concerns on 4th Embodiment. It is an expanded view of the circumferential direction of the external cooling structure of the sealed rotary electric machine of 4th Embodiment.

  Hereinafter, a hermetic rotating electrical machine according to an embodiment of the present invention will be described with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

[First Embodiment]
FIG. 1 is an elevational sectional view showing a configuration of a hermetic rotary electric machine according to the first embodiment. The hermetic rotary electric machine 200 includes a rotor 10, a stator 20, a frame 31, a bearing 40, and an external cooling structure 110.

  The rotor 10 includes a rotor shaft 11 that is rotatably supported at both ends, and a cylindrical rotor core 12 that is fixed to the radially outer side of the rotor shaft 11. The stator 20 is formed in the vicinity of the inner surface of the stator core 21 and a cylindrical stator core 21 that is stationary and fixed so as to face the rotor core 12 on the outer side in the radial direction of the rotor core 12. And a stator coil 22 installed in a slot (not shown) arranged in the circumferential direction and extending in the axial direction.

  The frame 31 extends in a cylindrical shape in the axial direction, houses the stator 20 and the rotor core 12, and supports the stator 20 stationary. The bearing 40 is fixedly supported by the frame 31 and supports the rotor shaft 11 in a rotatable manner.

  An external cooling structure 110 is provided outside the frame 31 in the radial direction. Joule heat generated mainly by the stator coil 22 is transferred to the frame 31 by heat conduction. The heat inside the frame is transferred to the frame 31 by heat transfer between the frame 31 and the cooling gas. Thus, the heat transferred to the frame 31 is removed by the external cooling structure 110 attached to the frame 31.

  FIG. 2 is a side view of the hermetic rotary electric machine according to the present embodiment. FIG. 3 is a development view in the circumferential direction of the external cooling structure. The external cooling structure 110 includes a cooling unit cover 111, an axial partition plate 112, an injection unit 115, and a discharge unit 116.

  The cooling unit cover 111 is provided on the radially outer side of the cylindrical surface of the frame 31 so as to be opposed to the cylindrical surface. The cooling unit cover 111 is approximately the length of the frame 31 in the axial direction, and is laid over the entire circumference in the circumferential direction. However, the terminal block 150 is attached to the outer surface of the frame 31, and the portion where the terminal block 150 is provided is excluded from the range where the cooling unit cover 111 is installed.

  A side plate (not shown) is provided between the side surface of the cooling unit cover 111 and the frame 31. The frame 31, the cooling unit cover 111 and the side plate form a sealed space 118. The side plate is attached to the frame 31 by welding or the like.

  The injection part 115 and the discharge part 116 are attached to the frame 31 at a position between one circumferential end of the cooling part cover 111 and the other circumferential end of the cooling part cover 111. 2 shows an example in which the injection part 115 and the discharge part 116 are attached to the upper part of the frame 31, the present invention is not limited to this. Any location in the circumferential direction may be used.

  An injection tube 115 b is connected to the injection unit 115. The injection part 115 has a box shape and communicates with the sealed space 118 in an airtight manner through a communication port (not shown). The discharge portion 116 has a box shape and communicates with the sealed space 118 in an airtight manner through a communication port (not shown).

  For this reason, the cooling medium injected from the injection pipe 115 b flows into the sealed space 118 via the injection part 115. Further, the gas is discharged from the sealed space 118 through the discharge portion 116 and the discharge pipe 116b.

  The sealed space 118 is a substantially annular space. However, although it is almost close to the entire circumference, it does not extend over the entire circumference, and does not include the circumferential angle region of the portion where the injection portion 115 and the discharge portion 116 are provided. Has a partition. The sealed space 118 has a substantially rectangular parallelepiped shape when deployed in the circumferential direction. A communication port with the injection unit 115 and a communication port with the discharge unit 116 are formed at the end in the circumferential direction. In the sealed space 118, a flow path is formed by a plurality of axial partition plates 112 as partition members that form a coolant flow path. The plurality of axial partition plates 112 are arranged at intervals in the circumferential direction in the axial direction. The axial partition plates 112 adjacent to each other are disposed such that the flow direction is the axial direction and the directions are alternately reversed.

  In addition, the position of the injection | pouring part 115 and the discharge part 116 may mutually be reverse, and the flow direction may be reverse to FIG.

  The operation of the hermetic rotary electric machine 200 according to this embodiment configured as described above will be described. During operation of the hermetic rotary electric machine 200, heat generated inside the frame 31 including Joule heat generated in the stator coil 22 is caused by heat conduction via a support structure in the frame 31 or inside the frame 31. It transfers to the flame | frame 31 by heat transfer.

  The heat transferred to the frame 31 is transferred to the cooling medium by heat transfer between the frame 31 and the cooling medium flowing in the sealed space 118. Further, a part of the heat transferred to the frame 31 is transferred by heat conduction to each axial partition plate 112 fixed to the frame 31 by welding or the like. The heat transferred to the axial partition 112 is transferred to the cooling medium by heat transfer between the axial partition 112 and the cooling medium flowing in the sealed space 118. As described above, the heat transfer area to the cooling medium includes not only the surface area of the frame 31 but also the surface areas of both surfaces of the axial partition plate 112 although the form is different from this. That is, the heat removal capability is improved accordingly.

  Further, since the flow direction of the cooling medium in the sealed space 118 is axial and alternately changes in opposite directions, the temperature distribution in the axial direction of the cooling gas in the frame 31 on the cooled side is generated. The temperature in the frame 31 can be made uniform.

  As described above, according to this embodiment, the heat removal function can be ensured for the hermetic rotary electric machine 200 without requiring complicated processing.

[Second Embodiment]
This embodiment is a modification of the first embodiment. In the second embodiment, the partition member that forms the flow path of the coolant inside the sealed space 118 is different from the first embodiment. FIG. 4 is a side view of the hermetic rotary electric machine according to the second embodiment. As shown in FIG. 4, the outer shape of the second embodiment is the same as that of the first embodiment.

  FIG. 5 is a development view in the circumferential direction of the external cooling structure of the hermetic rotary electric machine according to the second embodiment. As in the first embodiment, the flow path configuration of the external cooling structure 120 is formed such that the flow direction is the axial direction and is alternately reversed. The partition member includes a plurality of first short partition plates 122 and a plurality of second short partition plates 123. That is, instead of the respective axial partition plates 112 in the first embodiment, a plurality of first short partition plates 122 and a plurality of second short partition plates 123 are arranged.

  The plurality of first short partition plates 122 are arranged with the longitudinal direction in the flow direction and the row direction. The plurality of second short partition plates 123 are alternately arranged with the first short partition plates 122 so as to be inclined with respect to the column direction.

  In the hermetic rotary electric machine according to the present embodiment configured as described above, the surface areas of both surfaces of the partition member are the surface areas of both surfaces of the plurality of first short partition plates 122 and both surfaces of the plurality of second short partition plates 123. Therefore, the heat transfer area increases.

  Further, since the flow in the sealed space 118 is disturbed, the flow velocity of the cooling medium increases in each part of the partition member, and the number of lay nozzles increases. The heat transfer coefficient increases as the number of lay nozzles increases.

  As described above, as a result of increasing the heat transfer area and the heat transfer coefficient, the cooling capacity increases.

[Third Embodiment]
This embodiment is a modification of the first embodiment. FIG. 6 is a side view of the hermetic rotary electric machine according to the third embodiment. In the third embodiment, the cooler cover 131 is provided over the entire circumference except for the injection portion 115 and the discharge portion 116.

  FIG. 7 is a development view in the circumferential direction of the external cooling structure of the hermetic rotary electric machine according to the third embodiment. In the present embodiment, a spiral partition plate 133 is provided as a partition member of the external cooling structure 130. The spiral partition plate 133 is attached with an inclination, that is, in a spiral shape along the circumferential direction perpendicular to the axial direction. In the present embodiment, the flow path of the cooling medium is a flow path in only one direction. In other words, the cooling medium that has flowed into the sealed space 118 from the injection unit 115 proceeds in the circumferential direction in the sealed space 118 without changing the flow direction, and is discharged from the discharge unit 116.

  In the present embodiment formed as described above, the flow path in the sealed space 118 is not redirected, enlarged, or reduced, so that the pressure loss is low, and the power of the cooling medium circulation system can be reduced. .

[Fourth Embodiment]
In the present embodiment, the flow direction is not the axial direction but the direction perpendicular to the axis, as compared with the first embodiment. Further, the difference is that two sealed spaces, a sealed space 149a and a sealed space 149b, are formed. FIG. 8 is a side view of a hermetic rotary electric machine according to the fourth embodiment. Two sets of a box-shaped injection part 145 and discharge part 146, and an injection part 147 and a discharge part 148 are provided. In addition, the pipes connected to the injection part 145 and the discharge part 146, the injection part 147 and the discharge part 148, respectively, are provided with an injection pipe 145b and a discharge pipe 146b, and an injection pipe 147b and a discharge pipe 148b.

  FIG. 9 is a development view in the circumferential direction of the external cooling structure of the hermetic rotary electric machine according to the fourth embodiment. The external cooling structure 140 includes a partition partition plate 142 and a circumferential partition plate 143 as partition members in the sealed space.

  The partition partition plate 142 is provided in a direction perpendicular to the axis, and defines a sealed space 149a and a sealed space 149b. A flow path is formed by a circumferential partition plate 143 in each of the sealed space 149a and the sealed space 149b. The flow paths are perpendicular to the axis, and the flow paths adjacent to each other are flow paths in opposite directions.

  In the present embodiment configured as described above, the flow path is perpendicular to the axis and the direction is alternately reversed, so that the temperature distribution in the circumferential direction can be made uniform. Further, by dividing in the axial direction, the temperature distribution in the axial direction can be made uniform.

[Other Embodiments]
As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. For example, the case where the external cooling mechanism is fixed to the frame by welding or the like at a position in contact with the outer surface of the frame is shown, but the present invention is not limited to this. For example, the external cooling mechanism may be configured to be removable from the frame. Moreover, you may combine the characteristic of each embodiment.

  Furthermore, these embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention.

  These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Rotor, 11 ... Rotor shaft, 12 ... Rotor core, 20 ... Stator, 21 ... Stator core, 22 ... Stator coil, 31 ... Frame, 40 ... Bearing, 110 ... External cooling structure, 111 ... Cooling unit cover, 112 ... axial partition plate (partition member), 115 ... injection unit, 115b ... injection tube, 116 ... discharge unit, 116b ... discharge tube, 118 ... sealed space, 120 ... external cooling structure, 122 ... first DESCRIPTION OF SYMBOLS 1 Short partition plate (partition member), 123 ... 2nd short partition plate (partition member), 130 ... External cooling structure, 131 ... Cooler cover, 133 ... Spiral partition plate (partition member), 140 ... External cooling structure 142 partition partition plate (partition member) 143 circumferential partition plate partition member 145 injection part 145b injection pipe 146 discharge part 146b discharge pipe 14 ... injection portion, 147b ... inlet tube, 148 ... discharge unit, 148b ... exhaust pipe, 149a, 149 b ... closed space, 150 ... terminal block, 200 ... sealed type rotary electric machine

Claims (5)

A rotor having a rotor shaft extending in the axial direction and a rotor core provided on the radially outer side of the rotor shaft;
A stator core provided on the outer side in the radial direction of the rotor core and laminated with steel sheets for iron core, and a stator having a stator coil laid in a slot formed in the stator core;
A frame that accommodates the stator and the rotor core and extends in a cylindrical shape;
An external cooling structure that is provided radially outside the frame and cools the frame from the outside;
With
The external cooling structure is
A cooling part cover that is arranged so as to face the frame at an interval and covers a cylindrical part of the frame to form a sealed space together with the frame;
A partition member that connects an inner surface of the cooling unit cover and an outer surface of the frame, partitions the sealed space, and forms a flow path of the coolant;
Have
A hermetic rotary electric machine characterized in that a coolant injection portion from the outside is formed and a coolant discharge portion to the outside is formed at the outlet of the flow path.   The partition member has an axial partition plate disposed in such a manner that the flow direction is an axial direction and is alternately reversed at intervals in the circumferential direction toward the axial direction. Item 2. The hermetic rotary electric machine according to Item 1. The partition member has a plurality of first short partition plates arranged in a row and in a row direction so as to be spaced apart from each other in the circumferential direction in the axial direction and the flow direction is the axial direction and alternately reverse. A second short partition plate disposed and inclined with respect to the row direction;
The first short partition plates and the second short partition plates are arranged alternately,
The hermetic rotary electric machine according to claim 1, wherein:   2. The hermetic rotating electric machine according to claim 1, wherein the partition member includes a spiral partition plate arranged to advance spirally in an axial direction. The partition member is
Two partition partitions arranged in the axial direction dividing the sealed space into two regions;
In each of the two regions, a circumferential partition plate that is disposed so as to be axially spaced apart from each other in the axial direction, and the flow direction is the axial direction and is alternately reversed.
Have
The hermetic rotary electric machine according to claim 1, wherein the injection part and the discharge part are independently formed in each section.

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