JPH0888951A - Shaft seal device of electric rotating machine - Google Patents

Abstract

PURPOSE: To obtain a shaft seal device of an electric rotating machine which makes possible the attainment of seal between a casing cover of a dust- protection type electric rotating machine and a rotating shaft even when the casing cover is deformed. CONSTITUTION: A packing ring 6 sealing a rotating shaft 1 is made to be supported by a bearing holder 4 holding a bearing, by joining it to the holder by welding with a support material 8 interposed, while this packing ring 6 is provided with a packing 7 of rubber properties by fixing thereto this packing tightly by a bolt 11, and a casing cover 3 is disposed on the packing 7 by bringing it into close contact with the surface of this packing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a shaft sealing device for sealing between a rotating shaft and an outer cover covering a rotating electric machine body.

[0002]

2. Description of the Related Art FIGS. 4 and 5 are sectional views of a rotary electric machine. FIG. 4 is a longitudinal sectional view of a rotary electric machine equipped with a conventional shaft sealing device, and FIG. It is a figure. By the way, there is a fully-closed type in which the outer cover is closed in the protection method using the outer cover of the rotating electric machine. This fully closed type prevents dust and water droplets from entering from the outside of the machine as much as possible, and is configured to prevent outside air from flowing into the main body of the rotating electric machine.The outer cover covers the gap between the rotating shaft and A shaft sealing device is provided. The structure of the fully-enclosed outer cover covers the entire rotating electric machine body including a stator core 13 that houses a stator coil 14 and a rotor that has a magnetic pole core 15 around which a field coil (not shown) is wound. As shown in FIG. 4, there are an integral type outer cover and a split type outer cover 3 which is fixed by bolts 2 on both sides of a stator frame 2 which holds a stator core 13.

As shown in FIG. 5, the shaft sealing device for sealing between the outer cover 3 and the rotary shaft 1 has a structure in which the packing ring 6 surrounding the rotary shaft 1 in the outer cover 3 is bolted. It is configured to be fixed by tightening at 10. Normally, the packing ring 6 is mounted so that the gap between the packing ring 6 and the rotary shaft 1 is 0.2 mm or less. However, even if the packing ring 6 and the rotary shaft 1 come into contact with each other during operation, the rotary shaft 1 will not be damaged. In addition, it is made of brass or an insulating laminated plate.

[0004]

The above-described split type outer cover 3 of the fully-closed rotary electric machine can reduce the weight and can be manufactured as compared with an integral type outer cover that covers the entire main body of the rotary electric machine. It is also used in large, fully-closed rotating electrical machines due to the small number of man-hours. By the way, the split type outer cover 3 of a large-sized rotating electric machine is usually manufactured by a can-making operation by reinforcing a steel plate having a thickness of 4.5 to 6 mm with a beam or the like. However, the surface on which the packing ring 6 is attached may not be perpendicular to the rotary shaft 1 due to the deformation of the outer cover 3 due to the vibration during operation, and the seal between the packing ring 6 and the rotary shaft 1 may be incomplete. There is a problem that it will be enough. Further, as described above, since the gap between the packing ring 6 and the rotary shaft 1 is 0.2 mm or less, when the outer cover 3 is deformed, the packing ring is attached to the outer cover 3 to ensure this dimension. There is also a problem that the work of installing 6 is difficult and the installation work requires a lot of time.

An object of the present invention is to solve the above problems and to provide a shaft sealing device for a rotary electric machine, which can obtain a seal between the outer cover and the rotary shaft even if the outer cover is deformed. .

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a packing which supports a packing ring by a fixed portion of a rotating electric machine and which has a rubber elasticity between the packing ring and the outer cover. They will be placed in close contact with each other.

The fixing portion for supporting the packing ring is preferably a bearing stand for holding the bearing of the rotary shaft.

Further, it is more preferable that the fixing portion for supporting the packing ring is a base for holding the rotating electric machine.

[0009]

According to the present invention, the packing ring, which constitutes the shaft sealing device for sealing between the split type outer cover of the fully-closed rotary electric machine and the rotary shaft, is conventionally installed on the outer cover. , Even if there is mechanical vibration during the operation of the rotating electric machine, the influence of the vibration is small and it is supported by a fixed portion outside the machine that constitutes the rotating electric machine, so that the mechanical strength of the packing ring described above is increased. The deformation due to vibration can be eliminated, and the outer cover can be installed accurately perpendicular to the rotation axis without being affected by the deformation at the time of manufacturing the conventional outer cover. Further, in addition to the above-mentioned packing ring support structure, by inserting and arranging an elastic packing capable of sufficiently following and absorbing the deformation of the outer cover between the outer cover and the packing ring, Even if the deformation occurs, the close contact between the outer cover and the packing ring is maintained, so that the seal between them can be secured.

If the packing ring is supported by a bearing stand fixed to a bearing provided on the rotary shaft, the packing ring surface and the rotary shaft can be reliably arranged vertically.

Further, the same effect can be obtained by supporting the rotary electric machine main body on a base provided outside the machine for fixing and holding the main body of the rotary electric machine.

[0012]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a sectional view of a rotary electric machine provided with a shaft sealing device according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a P portion of FIG. 1, showing a shaft seal according to a first embodiment of the present invention. It is sectional drawing of a stop device. In addition, the figure includes the second embodiment described below,
The same reference numerals are used for the same parts as the conventional one, and the detailed description is omitted. As shown in FIGS. 1 and 2, the rotary shaft 1
The packing ring 6 surrounding the is made of brass, and is arranged perpendicular to the rotary shaft 1 by welding and joining the packing ring 6 and the bearing base 4 with a pipe-shaped support member 8 made of a tubular steel material. As shown in FIG. 1, two supporting members 8 are provided at the upper and lower positions of the rotary shaft 1. Further, on the surface of the packing ring 6, a rubber ring-shaped packing 7 is arranged so as to match the end surface portion of the outer cover 3 through which the rotary shaft 1 passes, and bolts 11 are provided at a plurality of places on its circumference. The outer cover 3 is placed in close contact with the surface of the packing 7 by tightening and fixing.

As a result, the packing ring 6 is supported by the bearing base 4 which is a fixed portion, and the packing ring 6 and the rotary shaft 1 are supported.
Since the and are arranged at right angles to each other, even if the outer cover 3 is deformed due to vibration or the like, the packing ring 6 and the rotating shaft 1 do not deviate from each other and the sealing function of this portion can be prevented from being deteriorated. It will be possible. Further, the outer cover 3 is
Since the rubber packing 7 is in close contact with the rubber packing 7, the packing 7 described above absorbs the deformation and vibration due to the deformation generated during the manufacturing of the outer cover 3 and the vibration during the operation of the rotating electric machine. The sealing property between the outer cover 3 and the packing ring 6 is not impaired. The supporting member 8 for supporting the packing ring 6 on the bearing base 4 is not limited to the structure in which the pipe-shaped steel material of this embodiment is welded and joined, and may be screwed to each other by a stud bolt. This screw connection is effective when an insulating laminated plate that cannot be welded to the packing ring 6 is used. The packing 7 fixed to the side surface of the packing ring 6 can also be fixed by inserting it into a groove provided on the surface of the packing ring 6.

FIG. 3 is a partial perspective view of a shaft sealing device according to a second embodiment of the present invention, and is an enlarged view of a Q portion of FIG. The difference from the first embodiment of the present invention is that the packing ring 6 is supported by the base 5 that holds the rotating electric machine body. The support leg 9 for supporting the packing ring 6 on the base 5 is made of a steel plate which is processed into an L shape and reinforced as shown in FIG. 3, and one end of the support leg 9 is attached to the base 5 by a bolt 12. The other end is tightened and fixed to the packing ring 6 with a bolt 13 to be supported.

Also in this embodiment, the rubber packing 7 is provided on the surface of the packing ring 6 facing the outer cover 3.
Are fixed by bolts (not shown), and the packing ring 6 and the outer cover 3 are arranged in close contact with each other via the packing 7. With this, the first
Similar to the embodiment, even if external mechanical vibration or deformation of the outer cover 3 is applied, the packing ring 6 can be arranged perpendicularly to the rotating shaft 1 and the outer cover 3 is not affected. Since the deformation of the cover 3 is absorbed by the elastically deformable rubber packing 7, the rotary shaft 1 and the packing ring 6 and the packing ring 6 and the outer cover 3 can be reliably sealed.

[0016]

As described above, according to the present invention, a shaft sealing device for a fully closed rotary electric machine, particularly a shaft sealing device for sealing between a split type outer cover and a rotary shaft, constitutes the shaft sealing device. The packing ring is supported by a fixed part such as a bearing stand that holds the bearing or a base that holds and fixes the main body of the rotating electrical machine, and the packing ring is provided with a rubber-like elastically deformable packing. The cover is in close contact with the cover. Accordingly, it is possible to obtain a shaft sealing device that can seal the rotating shafts even when the outer cover is vibrated or deformed. In addition, because the structure that fixes the packing ring to the outer cover is not adopted, the number of manufacturing steps is less than that of the conventional configuration, which required a lot of time to attach the packing ring due to deformation of the outer cover. It can be reduced and can be manufactured more economically.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary electric machine including a shaft sealing device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a P portion in FIG. 1, and is a cross-sectional view of the shaft sealing device according to the first embodiment of the present invention.

3 is an enlarged view of a Q portion of FIG. 1, and is a perspective view of a shaft sealing device according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a rotary electric machine provided with a conventional shaft sealing device.

5 is an enlarged view of an R portion of FIG.

[Explanation of symbols]

 1 Rotating Shaft 2 Stator Frame 3 Outer Cover 4 Bearing Stand 5 Bed Floor 6 Packing Ring 7 Packing 8 Support Material 9 Support Leg 11 Bolt 12 Bolt 13 Bolt

Claims (3)

[Claims] 1. A shaft sealing device for a rotary electric machine, comprising a packing ring for sealing between an outer cover provided on a stator frame of the rotary electric machine and a rotary shaft, wherein the packing ring is provided at a fixed portion of the rotary electric machine. A shaft sealing device for a rotary electric machine, characterized in that the packing ring and the outer cover are supported and closely arranged via a packing having rubber elasticity. 2. The shaft sealing device for a rotary electric machine according to claim 1, wherein the fixing portion that supports the packing ring is a bearing stand that holds a bearing of the rotary shaft. Stop device. 3. The shaft sealing device for a rotary electric machine according to claim 1, wherein the fixing portion that supports the packing ring is a pedestal that holds the rotary electric machine. .