Frame of water-cooling rotary machine and manufacturing method of the same

Abstract

To provide a frame of a water-cooling type rotary machine which enables efficient cooling.SOLUTION: A frame of a water-cooling rotary machine houses a stator and a rotor of the water-cooling rotary machine at the radial inner side. The frame includes: an inner cylinder in which the stator is disposed at the radial inner side; an outer cylinder disposed at the radial outer side of the inner cylinder; a channel of a coolant formed between the inner cylinder and the outer cylinder; and a partition wall which partitions the channel, inclining in an axial direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a frame of a water-cooled rotating machine and a method for manufacturing the same. [Background technology]

[0002] Conventionally, a cooling structure has been known in which a water channel is provided in the frame of a rotating machine and water is flowed through this channel to cool the rotating machine. Patent Document 1 discloses a water-cooled rotating machine in which the frame is composed of an inner cylinder and an outer cylinder provided radially outside the inner cylinder, and a water channel separated by a partition wall is provided between the inner cylinder and the outer cylinder. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 2563562 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the water-cooled rotating machine described in Patent Document 1, the partition wall between the inner and outer cylinders is shaped to extend in a direction parallel to the rotating axis of the rotating machine, which lacks variety in the water channels and may result in inefficient cooling.

[0005] An object of the present invention is to provide a frame of a water-cooled rotating machine that can be cooled efficiently. [Means for solving the problem]

[0006] A frame of a water-cooled rotating machine according to one aspect of the present invention is a frame of the water-cooled rotating machine that houses the stator and rotor of the water-cooled rotating machine radially inside, and is characterized by having an inner tube in which the stator is arranged radially inside, an outer tube arranged radially outside the inner tube, a water channel for cooling water formed between the inner tube and the outer tube, and a partition wall that separates the water channel at an angle in the axial direction. [Effects of the Invention]

[0007] According to one aspect of the present invention, it is possible to provide a frame of a water-cooled rotating machine that can be cooled efficiently. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a frame 100 according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of a water channel 200 in the frame 100. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a frame according to an embodiment of the present invention will be described with reference to the drawings. Note that in the drawings, the scale and number of components may differ from the actual structure in order to make each component easier to understand.

[0010] The direction in which the central axis J shown in FIG. 1 extends is referred to as the axial direction. In the axial direction, the lower right side in FIG. 1 is referred to as the "one side," and the upper left side in FIG. 1 is referred to as the "other side." Note that the terms "one side" and "other side" are names used merely for explanation and do not limit the actual positional relationship or direction. Furthermore, unless otherwise specified, the radial direction centered on the central axis J is simply referred to as the "radial direction," and the circumferential direction centered on the central axis J, i.e., around the axis of the central axis J, is simply referred to as the "circumferential direction." In the radial direction, the side closer to the central axis J is referred to as the "radially inner side," and the side away from the central axis J is referred to as the "radially outer side." In the circumferential direction, the clockwise side when viewed from the other axial side is referred to as the "one circumferential side," and the counterclockwise side is referred to as the "other circumferential side."

[0011] In this specification, "extending in the axial direction" includes not only extending strictly in the axial direction but also extending in a direction tilted by less than 45° with respect to the axial direction. Furthermore, in this specification, "extending in the radial direction" includes not only extending strictly in the radial direction, i.e., in a direction perpendicular to the axial direction, but also extending in a direction tilted by less than 45° with respect to the radial direction. Furthermore, "parallel" includes not only being strictly parallel but also being tilted by an angle of less than 45° with respect to the direction perpendicular to the axial direction. Furthermore, "extending in a direction perpendicular to the axial direction" includes not only extending in a direction perpendicular to the axial direction but also extending in a direction tilted by less than 45° with respect to the direction perpendicular to the axial direction.

[0012] First Embodiment FIG. 1 is a perspective view of a frame 100 according to a first embodiment of the present invention. FIG. 2 is a perspective view of a water channel 200 in the frame 100. The frame 100 is an example of a motor frame. The motor is an example of a water-cooled rotating machine. The frame 100 is manufactured, for example, by die-casting using a die-cast mold.

[0013] The frame 100 has an inner cylinder 110 and an outer cylinder 120. The outer cylinder 120 is disposed radially outward of the inner cylinder 110. In FIG. 1, a portion of the outer cylinder 120 is cut away so that the ribs 112 of the inner cylinder 110 are visible. The frame 100 accommodates a stator (not shown) and a rotor (not shown) of a motor, with the stator and rotor disposed radially inside the inner cylinder 110. The rotor is disposed radially inside the stator via a gap. A shaft (not shown) serving as a rotating shaft is fixed to the rotor. The shaft is disposed along a central axis J.

[0014] The frame 100 has a water channel 200 shown in FIG. 2 between the inner cylinder 110 and the outer cylinder 120. Cooling water flows through the water channel 200 to cool the water-cooled rotating machine. The liquid flowing through the water channel 200 is not limited to cooling water, and may be any known refrigerant, such as oil. In the frame 100, both axial ends of the water channel 200 are water-sealed, for example, by ring-shaped rubber packing. The water channel 200 has an inlet water channel 210 through which the cooling water flows and an outlet water channel 220 through which the cooling water flows out. The inlet water channel 210 and the outlet water channel 220 may be reversed. The cooling water flowing in from the inlet water channel 210 flows through the water channel 200, which extends around the entire circumferential direction between the inner cylinder 110 and the outer cylinder 120, and then flows out from the outlet water channel 220.

[0015] The inner cylinder 110 has a wall portion 111 on its radially outer surface that forms the radially inner wall of the water passage 200. The wall portion 111 has a first wall portion 111a on one axial side of the wall portion 111, and a second wall portion 111b on the other axial side of the wall portion 111. The wall portion 111 is formed by butting together the other axial end of the first wall portion 111a and the one axial end of the second wall portion 111b.

[0016] The inner cylinder 110 has ribs 112 that protrude radially outward from the radially outer surface of the wall portion 111. The ribs 112 function as partition walls that separate the water passage 200. A plurality of ribs 112 are arranged in the circumferential direction. The ribs 112 include a first rib 112a provided on the first wall portion 111a and a second rib 112b provided on the second wall portion 111b. The rib 112 is formed by butting together the other axial end of the first rib 112a and one axial end of the second rib 112b.

[0017] The first rib 112a does not extend to one axial end of the first wall portion 111a. The first rib 112a extends to the other axial end of the first wall portion 111a. The rib 112 is inclined in the axial direction so that the circumferential position on one axial end is located closer to one circumferential side than the circumferential position on the other axial end.

[0018] The outer cylinder 120 has ribs 122 at positions facing the ribs 112 of the inner cylinder 110. The outer cylinder 120 has a structure divided in the axial direction, similar to the inner cylinder 110, and therefore a detailed description will be omitted. The ribs 112 and 122 are butted together to form an area 202 in the water channel 200 in FIG. 2 through which cooling water does not flow. As shown in FIG. 2, the water channel 200 has a circumferential water channel 201 that extends around the entire circumferential direction. The circumferential water channel 201 has a first circumferential water channel 201a formed by the first wall portion 111a and a second circumferential water channel 201b formed by the second wall portion 111a.

[0019] The first wall portion 111a and the second wall portion 111b are manufactured by die-casting using separate die-casting dies. As in the past, when the ribs functioning as partition walls extend in the axial direction, it is sufficient to simply pull the die-casting die straight in the axial direction. However, this method cannot be used when the ribs 112 have a shape that is inclined in the axial direction, as in this embodiment. Therefore, in this embodiment, the wall portion 111 having the ribs 112 that are inclined in the axial direction is manufactured by rotating the die-casting die along the inclination of the ribs 112 around the central axis J as the rotation axis and pulling it out.

[0020] The inclination direction of the ribs 112 is arranged in the opposite direction to the rotation direction of the rotor, thereby improving the vibration suppression performance of the motor.

[0021] According to this embodiment, it is possible to provide a frame in which the ribs 112 serving as partition walls of the water channel are shaped to be inclined in the axial direction. That is, according to this embodiment, it is possible to provide a frame having partition walls positioned and shaped so that the motor can be cooled efficiently.

[0022] Second Embodiment In the first embodiment, the outer tube 120 and the inner tube 110 are separate bodies, each separated in the axial direction. However, the present invention is not limited to this. For example, the outer tube and the inner tube may be integral and not separated in the axial direction. In this case, to manufacture a frame member in which the outer tube and the inner tube are integrated, a first die-casting mold is used to form one axial side of the frame member, and a second die-casting mold is used to form the other axial side of the frame member. When the first die-casting mold and the second die-casting mold are removed from the frame member, the first die-casting mold and the second die-casting mold are rotated along the inclination of the rib around the central axis J as a rotation axis, thereby forming an inclined rib in the axial direction between the outer tube and the inner tube.

[0023] The present invention is not limited to the above-described embodiments, and various improvements and design changes may be made without departing from the spirit of the present invention. In addition, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0024] 100...frame, 200...waterway

Claims

1. A frame of the water-cooled rotating machine that accommodates a stator and a rotor of the water-cooled rotating machine radially inside, an inner cylinder having the stator disposed radially inside; an outer cylinder disposed radially outside the inner cylinder; a cooling water channel formed between the inner cylinder and the outer cylinder; A partition wall that partitions the water channel at an inclination in the axial direction; A frame comprising:

2. A method for manufacturing a frame of a water-cooled rotating machine that houses a stator and a rotor of the water-cooled rotating machine radially inside, comprising: The frame is an inner cylinder having the stator disposed radially inside; an outer cylinder disposed radially outside the inner cylinder; a cooling water channel formed between the inner cylinder and the outer cylinder; A partition wall that partitions the water channel at an inclination in the axial direction; and The die-casting mold for die-casting is rotated according to the inclination of the partition wall and pulled out. A manufacturing method characterized by:

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