JP5750503B2 - Rotating electric machine - Google Patents

Description

  Embodiments of the present invention relate to a rotating electrical machine in which a plurality of cooling pipes are provided in a pressure vessel that houses a rotating electrical machine main body.

  Generally, in a rotating electrical machine such as a motor, it is necessary to efficiently release the heat generated during operation to the outside for cooling, and many proposals regarding a cooling structure for that purpose have been made (for example, see Patent Document 1).

  There is a so-called explosion-proof type as a structure of a rotating electrical machine. This explosion-proof type rotating electrical machine is configured such that a rotating electrical machine main body composed of a rotor and a stator is housed in a pressure vessel so that even if an explosion occurs inside, the explosion pressure does not propagate to the outside. . As such a rotating electrical machine cooling structure, in the pressure vessel, a plurality of heat exchange type cooling pipes along the rotation axis direction are arranged so as to surround the rotating electrical machine main body, and heat generated from the rotating electrical machine main body during operation is obtained. It is configured to discharge to the outside. In such a rotating electrical machine, since the plurality of cooling pipes are arranged so as to surround the outer periphery of the rotating electrical machine main body as described above, many cooling pipes also exist on the lower outer periphery of the rotating electrical machine main body.

  When installing a normal rotating electrical machine, the rotating electrical machine is installed by leg plates formed on the frame of the rotating electrical machine so that the lower outer periphery of the rotating electrical machine is in contact with the installation surface. However, in the case of the structure described above, since there are many cooling pipes on the lower outer periphery of the rotating electrical machine body, when the lower outer periphery of the rotating electrical machine body is installed on the installation surface, the rotating electrical machine body and its The lower outer periphery of the pressure vessel that accommodates the cooling pipe arranged to surround the outer periphery swells downward from the installation surface. For this reason, it is necessary to secure a space for accommodating the portion swelled downward from the installation surface at the installation location, and it is necessary to form a recess for securing the space, and it can be installed at a standard installation location. There wasn't.

JP 2008-245512 A

  The problem to be solved by the present invention is to provide a rotating electrical machine having a cooling structure that can be installed on a normal installation surface.

A rotating electrical machine according to an embodiment of the present invention includes a rotor core provided on the outer periphery of a rotating shaft, a rotating electrical machine main body having a cylindrical stator core provided at a distance from the outer periphery of the rotor core, A pressure vessel surrounding the periphery of the rotating electrical machine body, and a plurality of cooling pipes arranged along the axial direction of the rotating shaft at positions surrounding the outer periphery of the rotating electrical machine body in the pressure vessel. the rotary electric machine main body, said eccentrically provided downward in a pressure vessel, wherein the cooling pipe is in the upper space of the pressure vessel, are installed a number of number than the lower space, said pressure vessel , Having an opening in a penetrating portion of the rotating shaft, and the opening is closed by a peripheral portion of a bearing bracket that rotatably supports the rotating shaft, and the bearing bracket is formed on the outer surface of the rotating shaft. Are integrally fastened to the periphery of the opening by a plurality of bolts arranged on a circumference centered on the circumference, the circumference where the plurality of bolts are arranged is located outside the outer circumference of the rotating electrical machine body, Some of the plurality of cooling pipes have their ends arranged between the plurality of bolts on the circumference .

It is a longitudinal cross-sectional view which opens and shows the upper part of the rotary electric machine which concerns on one Embodiment of this invention. It is a right view of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The rotating electrical machine shown in FIGS. 1 and 2 is configured by housing a rotating electrical machine main body 12 in a pressure vessel 11. The rotating electrical machine main body 12 has a rotor core 14 provided on the outer periphery of the rotary shaft 13 and a cylindrical shape, and an inner periphery of the stator core 15 provided at a distance from the outer periphery of the rotor core 14. Have. The pressure vessel 11 surrounds the periphery of the rotating electrical machine main body 12 with an interval therebetween. Further, openings are formed in portions of the frame 111 constituting the left and right end surfaces through which the rotary shaft 13 passes, and these left and right openings are integrally closed by bearing brackets 17 respectively.

  The bearing bracket 17 includes a bearing portion 18 that rotatably supports the rotary shaft 13, and a peripheral portion 19 of the bearing portion 18 is provided so as to close the opening of the left and right end surfaces of the pressure vessel 11 described above. That is, as shown in FIG. 2, the bearing bracket 17 is attached to the opening periphery of the frame 111 by a plurality of bolts 21 arranged on the circumference 19 a centering on the rotation shaft 13 on the outer surface of the peripheral portion 19. It is attached integrally. A circumference 19 a where the plurality of bolts 21 are arranged is located outside the outer periphery of the rotating electrical machine main body 12, more specifically, from the outer periphery of the stator core 15.

  Legs 111a for installation are integrally formed on the left and right sides of the frame 111 constituting the left and right end surfaces of the pressure vessel 11 as shown in FIG. In FIG. 2, 22 is a cable for external connection, and 23 is a flange for a terminal box.

  A plurality of cooling pipes 25 are provided in the pressure vessel 11 along the axial direction of the rotary shaft 13. The plurality of cooling pipes 25 are of a heat exchange type, and both ends of the cooling pipes 25 pass through the frames 111 constituting both end faces of the pressure vessel 11 and communicate with the outside so that a cooling medium such as air flows from the outside. It is configured. Further, the plurality of cooling pipes 25 are arranged at positions surrounding the outer periphery of the rotating electrical machine main body 12.

  Here, the rotating electrical machine main body 12 is provided eccentrically downward in the pressure vessel 11 as shown in FIG. For this reason, an upper space having a larger volume than the lower space is generated in the pressure vessel 11. As shown in the figure, the plurality of cooling pipes 25 are mostly concentrated in the upper space in the pressure vessel 11 and more than the lower space are installed.

  Further, as shown in FIG. 2, some of the plurality of cooling pipes 25 have their end portions on the circumference 19 a where the plurality of bolts 21 are disposed, in other words, portions where the bolts 21 are not disposed. , Between the plurality of bolts 21. As described above, the circumference 19 a where the plurality of bolts 21 are arranged is located outside the outer periphery of the stator core 15, but the plurality of bolts 21 fasten the bearing bracket 17 to the opening periphery of the frame 111. Due to this structure, the position of the circumference 19 a is very close to the outer periphery of the stator core 15. For this reason, the cooling pipe 25 which opens both ends on this circumference 19 a is also located near the outer periphery of the stator core 15.

  As described above, by arranging some of the plurality of cooling pipes 25 at positions near the outer periphery of the stator core 15, the accommodation capacity of the cooling pipes 25 in the pressure vessel 11 can be reduced accordingly. .

  In the above configuration, heat generated in the rotating electrical machine main body 12 during operation of the rotating electrical machine is heat-exchanged by the plurality of cooling pipes 25 installed in the pressure vessel 11 and released to the outside. In this embodiment, many of the plurality of cooling pipes 25 are concentrated in the upper space in the pressure vessel 11, but the heat generated in the rotating electrical machine body 12 rises in the pressure vessel 11. The generated heat can be efficiently released to the outside.

  In addition, since most of the plurality of cooling pipes 25 are arranged in the upper space in the pressure vessel 11, the cooling pipes 25 are hardly arranged on the outer periphery of the lower part of the rotating electrical machine main body 12 as shown in FIG. 2. That is, the cooling pipe 25 is not disposed on the outer periphery of the lower part of the rotating electrical machine body 12 except for the several cooling pipes 25 on the circumference 19a where the bolt 21 is disposed. Accordingly, the outer periphery of the lower portion does not swell downward, and the leg plate 111a shown in FIG. 2 is used to form a recess for securing a space for installing the swelled portion even when installed on a flat installation surface. However, the explosion-proof type rotating electrical machine according to this embodiment can be installed at a standard installation location similar to a general rotating electrical machine.

  In general, in a pressure-proof explosion-proof rotating electrical machine, if the volume of the pressure vessel is large, if an explosion occurs inside, the explosion pressure becomes high, and it is necessary to increase the pressure strength such as increasing the plate pressure of the pressure vessel. For this reason, the overall shape is increased in size and weight. Therefore, in this embodiment, as described above, some of the plurality of cooling pipes 25 are arranged on their circumferences 19 a so that their ends are close to the outer periphery of the stator core 15. As a result, the accommodation capacity of the cooling pipe 25 in the pressure vessel 11 was reduced accordingly. Therefore, since the volume of the pressure vessel 11 can be reduced, if an explosion occurs inside, the explosion pressure can be kept low, and the overall shape can be reduced in size and weight.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel 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 modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 11 ... Pressure vessel 111 ... Frame 111a ... Leg plate 12 ... Leg plate 12 ... Rotating electrical machine main body 13 ... Rotating shaft 14 ... Rotor core 15 ... Stator core 17 ... Bearing bracket 18 ... Bearing part 19 ... Peripheral part 19a ... Circumference 21 ... Bolt 25 ... Cooling pipe

Claims (1)

A rotor core provided on the outer periphery of the rotating shaft, a rotating electric machine main body having a cylindrical stator core provided at a distance from the outer periphery of the rotor core;
A pressure vessel surrounding the rotating electrical machine main body,
A plurality of cooling pipes arranged along the axial direction of the rotating shaft at positions surrounding the outer periphery of the rotating electrical machine main body in the pressure vessel,
The rotating electrical machine main body is provided eccentrically downward in the pressure vessel, and the cooling pipe is installed in a larger number in the upper space in the pressure vessel than in the lower space ,
The pressure vessel has an opening in a penetrating portion of the rotating shaft, and the opening is closed by a peripheral portion of a bearing bracket that rotatably supports the rotating shaft, and the bearing bracket is formed on the outer surface of the rotating shaft. Fastened integrally to the periphery of the opening by a plurality of bolts arranged on the circumference centered on the shaft,
The circumference where the plurality of bolts are arranged is located outside the outer periphery of the rotating electrical machine main body, and some of the plurality of cooling pipes have their ends on the circumference. A rotating electrical machine characterized by being disposed between .

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