JP2014155264A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine which improves waterproofness and reliability and is made compact.SOLUTION: The rotary electric machine comprises a disc-shaped member 5 which is mounted on a rotary shaft 3 protruding from an end bracket 2A and is rotated together with the rotary shaft 3 and disposed in a recess provided outside of the end bracket 2A in an axial direction. A labyrinth structure 6 is provided on opposing surfaces of the end bracket 2A and the disc-shaped member 5 and at an outer circumferential side than a bearing in a radial direction. Further, a cover member 8 which is disposed while being spaced apart from the rotary shaft 3, is mounted to the end bracket 2A.

Description

  The present invention relates to a rotating electrical machine.

  Patent Document 1 is known as an example of a case where a countermeasure against water intrusion is required for a rotating electrical machine, such as when a rotating electrical machine is installed outdoors. In this example, “a disk-like member 10 that rotates together with the rotating shaft 6” is provided, and “a labyrinth structure 12 is formed between the end brackets 2A and 2B to prevent water from entering the rotating electrical cabinet”.

  Further, Patent Document 2 discloses an example provided with a radiation fin “fixed to a rotating shaft (4) by a fitting set screw (8)”, and shows a configuration covered with a protective cover provided with a ventilation hole. ing.

JP 2011-015479 A Microfilm of actual application No. 58-13929 (No. 59-122758)

  Generally, a rotating electrical machine has a structure that has a stator and a frame that covers the rotor, and an output shaft projects from the frame. Since the output shaft rotates when the rotating electrical machine is driven, it is necessary to provide a minute gap between the frame and the output shaft.

  On the other hand, if the rotating electrical machine enters water from the outside into the frame, a malfunction such as a short circuit of the conductive part or deterioration of the lubricating oil used for the bearing may occur, and the function of the rotating electrical machine will be impaired. Countermeasures are required.

  Examples of methods for preventing inundation of the rotating electrical machine into the machine include an example of preventing inundation by using a draining collar or cover at the shaft penetrating part, an example in which a sliding part is provided using a V ring, an oil seal, etc. to increase confidentiality, or A device having a labyrinth structure as in Patent Document 1 is known.

  When a collar or cover is installed in the shaft penetrating portion, it is necessary to secure a space in the axial direction in order to provide these components and structures. For this reason, the position of the bearing is limited, and the degree of freedom in design is reduced. In addition, although a structure using a V ring, an oil seal, or the like is simple, additional consideration is required in terms of reliability, such as the life of the sliding portion.

  In addition, even when a labyrinth structure is employed, it is difficult to secure a space in the axial direction, and it is not certain how much the labyrinth structure is provided to ensure sufficient waterproofing. In the example of Patent Document 1, a labyrinth structure is provided on the inner side of a disk-shaped member that rotates together with the rotation shaft. However, in this configuration, a portion that rotates together with the shaft extends widely in the radial direction from the shaft. . Therefore, since there exists a planar portion that rotates at a high speed around the shaft, there has been a problem that it is necessary to consider safety when installing the rotating electrical machine.

  In Patent Document 2, a protective cover for covering the radiation fins is provided. However, in order to install the radiation fins and the protection cover in the axial direction from the surface of the bracket, it is necessary to ensure the dimensions in the radial direction. Space saving has been difficult.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotating electrical machine that is improved in waterproofness, reliability, and compactness.

  In order to achieve the above object, the rotating electrical machine of the present invention is provided with a cylindrical frame that covers the rotor and the stator, and a bearing that covers the opening of the frame and supports the rotating shaft fixed to the rotor. An end bracket, a disc-like member that is attached to a rotary shaft protruding from the end bracket and rotates together with the rotary shaft, and is disposed in a recess provided outside the axial direction of the end bracket, the end bracket and the disc-like member It is the surface facing the member, and is attached to the end bracket and the labyrinth structure provided on the outer peripheral side in the radial direction from the bearing, covers the entire area of the disk-shaped member, and is arranged with a gap between it and the rotating shaft. Cover member.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary electric machine which aimed at the waterproof improvement, reliability improvement, and compactization can be provided.

  Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

It is a structure figure of the rotary electric machine of a present Example. It is a principal part enlarged view of a rotary electric machine. It is a figure which shows the state which removed the cover member in the principal part enlarged view shown in FIG.

  Hereinafter, modes for carrying out the invention will be described.

  The present embodiment includes a frame that covers the rotor and the stator, an end bracket to which a bearing that supports the rotating shaft fixed to the rotor is attached, a disk-shaped member that rotates together with the rotating shaft that protrudes from the end bracket, And the rotary electric machine which has a cover which covers this is made into object.

  In such a rotating electrical machine, more specifically, by providing the waterproof structure in the outer peripheral direction, not in the periphery of the shaft penetration part, while saving space of the waterproof structure and increasing the design freedom of the bearing position, As will be described in detail below, the waterproof property is further improved and the reliability of the rotating electrical machine is improved.

  Hereinafter, this embodiment will be described in more detail with reference to the drawings. FIG. 1 is a structural diagram of the rotating electrical machine of this embodiment. Although the upper half structure is shown in FIG. 1, the lower half has the same structure unless otherwise specified.

  The casing of the rotating electrical machine is constituted by a cylindrical frame 1 and end brackets 2 (2A and 2B) that cover the opening of the cylindrical frame 1 from both sides. The frame 1 is formed in a substantially cylindrical shape from a metal material such as cast iron, aluminum, or thin steel plate, for example, and constitutes a radial jacket of the rotating electrical machine. The end bracket 2 is attached to the openings on both sides of the frame 1 by using inlay fitting or the like.

  As described above, the frame 1 and the end brackets 2A and 2B form a substantially enclosed space, and a fully-enclosed and jacket-cooled rotating electrical machine that does not actively communicate internal and external air.

  A bearing is attached to each of the end brackets 2 and supports the rotating shaft 3. In the end bracket 2 </ b> B shown on the left side in FIG. 1, an external fan is attached to a rotating shaft that passes through a bearing, and cooling air is sent from the end bracket 2 </ b> B side toward the outer periphery of the frame 1. Specifically, the cover entirely covers the end bracket 2B so as to guide the cooling air to the outer peripheral side, and the space surrounded by the cover and the end bracket 2B is cooled by the rotation of the external fan. An air path is formed, and cooling air flows through the surface of the frame 1.

  Although not shown, a plurality of cooling fins are provided on the outer peripheral surface of the frame 1 in the extending direction of the rotating shaft to increase the efficiency of heat exchange with the cooling air and to ensure cooling performance.

  A stator 4A made of a laminated steel plate is attached to the inner peripheral surface of the frame 1. A coil is wound around the stator 4A, and a rotating magnetic field is generated by receiving power. On the inner peripheral side of the stator 4A, a rotor 4B to which the rotary shaft 3 is attached is disposed with a gap therebetween and rotates with a rotating magnetic field. The rotating shaft 3 is rotatably supported by a bearing on the end bracket 2A side (right side in FIG. 1), and protrudes from the end bracket 2A. This protruding portion serves as an output shaft, and applies a rotational force to a driving object (not shown).

  Since the end bracket 2A and the rotation shaft 3 (output shaft) are structured such that one is fixed and the other rotates, it is necessary to provide a minute gap between them. However, if water enters the inside of the housing from this gap, there is a problem because the stator 4A and the rotor 4B exist inside the housing. Therefore, in this embodiment, the waterproof structure α is provided.

  FIG. 2 is an enlarged view of a main part of the rotating electrical machine, and particularly shows details of the waterproof structure. The rotating electrical machine of this embodiment is waterproofed mainly by the following configuration. First, the disk-shaped member 5 is disposed so as to cover the bearing periphery of the end bracket 2A. The disk-shaped member 5 is fixed to the rotating shaft 3, and the disk-shaped member 5 rotates as the rotating shaft 3 rotates. A labyrinth structure 6 is provided on the surface of the disk-like member 5 facing the end bracket 2A. The surface of the end bracket 2A is also provided with a concavo-convex shape corresponding to the labyrinth structure of the disc-like member 5, and both are non-contacting and facing each other. The labyrinth structure 6 is located on the outer side in the radial direction from the bearing, and is separated from the rotating shaft 3 on the outer peripheral side.

  The end bracket 2A is provided with a recess around the insertion portion of the rotary shaft 3, and the entire disk-shaped member 5 is disposed in the recess to reduce the axial dimension.

  FIG. 3 is a diagram showing a state in which a cover member 8 (described later) is removed from the enlarged view of the main part shown in FIG. The disk-like member 5 is shown in a state where it is housed in a concave portion in the axial direction of the end bracket 2A, and even in this state, a waterproof structure by the labyrinth structure 6 is provided.

  Generally, when a waterproof structure is formed in the shaft penetrating portion, it is necessary to secure a space in the axial direction in order to provide these components and structure. For this reason, the position of the bearing is limited, and the degree of freedom in design is reduced. When the degree of freedom in design of the bearing position is low, it is difficult to secure a space in the rotating electrical machine. This limits the size of the parts that make up the interior of the rotating electrical machine. In this case, since the internal density of the rotating electrical machine increases, the in-machine temperature tends to increase. Furthermore, the position of the bearing has a great influence on securing the strength of the shaft. However, if the degree of freedom in design is low, a problem arises in securing the strength.

  In the waterproof structure as in the present embodiment, the labyrinth structure 6 is provided between the disk-shaped member 5 and the portion outside the bearing outer diameter on the surface of the end bracket 2A in the radial direction, thereby reducing the waterproof structure of the shaft through portion. It is possible to configure the space, and it is possible to improve the degree of freedom in designing the bearing position.

  In the present embodiment, when the disk-shaped member 5 is submerged, it is only necessary to provide a vertically downward drainage groove 7 between the end bracket 2A, thereby enabling drainage.

  Returning to FIG. As described above, the disk-shaped member 5 is attached to the rotary shaft 3 so that the disk-shaped member 5 is positioned in the concave portion of the end bracket 2A. In this embodiment, the disk-shaped member 5 is moved in the axial direction. A cover member 8 is attached so as to cover from the outside. The cover member 8 is fixed to the end bracket 2 </ b> A, and a minute gap exists between the cover member 8 and the rotary shaft 3.

  That is, there is a cover member 8 for protecting the disk-shaped member 5 that rotates together with the rotating shaft 3. This cover member 8 has the following action.

  First, by covering a planar portion (disk-like member 5) that rotates at high speed around the shaft with a cover member 8 that does not rotate, safety can be improved in installing the rotating electrical machine.

  Secondly, it is possible to protect the disk-shaped member 5 itself extended to the outer peripheral side of the bearing in order to enhance the waterproofness.

  Thirdly, it is possible to further enhance the effect of improving waterproofness. That is, the cover member 8 is attached with a minute gap between the cover member 8 and the disk-like member 5 is fixed to the rotatable shaft 3 on the inner peripheral side of the minute gap. The effect of suppressing the intrusion of water is dramatically increased.

  Specifically, the water that has entered from the minute gap between the cover member 8 and the rotary shaft 3 is restricted from entering the housing by the disk-shaped member 5, and the rotation of the disk-shaped member 5 It is guided outward in the radial direction by centrifugal force. When the water led to the outside enters the housing, it needs to be led to the inside again. However, as long as the disk-shaped member 5 is rotating, it must move against the centrifugal force. (When the disc-like member 5 is stopped, it is discharged to the outside through the drainage groove 7 as described above). Furthermore, since the labyrinth structure 6 is provided between the disk-shaped member 5 and the end bracket 2A, it is extremely difficult to enter water into the housing.

  The cover member 8 used in the present embodiment is sufficient if it covers the disk-like member 5 over the entire area, and does not require a complicated shape. That is, by providing the cover member 8 having a simple shape, the above-described action can be expected, and the waterproof property can be enhanced by an extremely simple configuration. In addition, the material of the disk-shaped member 5 and the cover member 8 of a present Example is not specifically limited, What is necessary is just to have the shape which has said effect | action.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. It is possible to replace a part of the configuration of a certain embodiment with another configuration having an equivalent action, and it is also possible to add another configuration to the configuration of the embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Frame, 2 (2A, 2B) ... End bracket, 3 ... Rotating shaft, 4A ... Stator, 4B ... Rotor, 5 ... Disk-shaped member, 6 ... Labyrinth structure, 7 ... Drain groove, 8 ... Cover member, α… Waterproof structure.

Claims (2)

A cylindrical frame covering the rotor and stator;
An end bracket that covers an opening of the frame and is attached with a bearing that supports a rotating shaft fixed to the rotor;
A disc-shaped member attached to a rotating shaft protruding from the end bracket and rotated together with the rotating shaft, and disposed in a recess provided on the outer side in the axial direction of the end bracket;
A labyrinth structure provided on the outer peripheral side in the radial direction of the end bracket and the disk-shaped member, the radial direction from the bearing;
A rotating electrical machine comprising: a cover member that is attached to the end bracket and covers the entire area of the disk-shaped member, and is disposed with a gap between the rotating shaft.   The rotating electrical machine according to claim 1, further comprising a drainage groove that guides water that has entered between the disk-shaped member and the end bracket to the outside.

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