CN212377285U

CN212377285U - Composite sealing device for shaft end of generator

Info

Publication number: CN212377285U
Application number: CN202021590154.8U
Authority: CN
Inventors: 毕雨; 田栋; 史凤林; 刘桂民; 王婷婷; 朱双
Original assignee: Veolia Harbin Thermal Power Co Ltd
Current assignee: Veolia Harbin Thermal Power Co Ltd
Priority date: 2020-08-04
Filing date: 2020-08-04
Publication date: 2021-01-19
Anticipated expiration: 2030-08-04

Abstract

The utility model relates to a compound sealing device of generator shaft end, on broach sealing strip (2) pressed and inlayed compound seal body (3) inner ring, each was a set of in the inside and outside, broach sealing strip (2) kept 0.1 mm's clearance with the surface of axis of rotation (1), had one toroidal cavity (7) in the compound seal body (3), intake pipe (4) communicate with each other with toroidal cavity (7), compound seal body (3) are together fixed through fastening bolt (5) and equipment casing (6). The utility model discloses outside compressed air forms the pressure-fired pressure in entering into toroidal cavity (7) through intake pipe (4), and the cavity of pressure-fired pressure can keep off outside air in sealing device outside, and the inside clean compressed air that gets into the generator can not cause any adverse effect to the system, and when broach sealing strip (2) wearing and tearing back clearance was too big, can effectively prevent inside contaminated air entering casing (6) of equipment casing (6) outside.

Description

Composite sealing device for shaft end of generator

Technical Field

The utility model relates to a compound sealing device of generator axle head.

Background

The inside cooling to rotor and stator that adopts the air-cooled mode of circulation of present small-size generator, there is a coaxial pivoted fan respectively at the axle head of generator, the fan is very close to axle head sealing device, can the stroke little negative pressure when unit during operation axle head sealing device department, take in the outside air from the axle head sealing in the clearance department of main shaft, and axle head sealing device is very close again from the bearing frame, so the greasy dirt that the bearing frame leaked out will be taken into generator, pollute stator winding coil and other spare parts, cause the increase of the improvement of equipment fault rate and maintenance volume, conventional broach is sealed can not satisfy the requirement of this kind of operating mode, consequently, it is very necessary to develop an effectual axle head seal structure.

Disclosure of Invention

The utility model aims at providing a compound sealing device of generator axle head keeps off outside air in sealing device outside, and the inside clean compressed air of entering generator can not cause any adverse effect to the system. The technical scheme of the utility model is that: the utility model provides a compound sealing device of generator shaft end, by axis of rotation (1), broach sealing strip (2), compound seal (3), intake pipe (4), fastening bolt (5) and equipment casing (6) are constituteed, the both sides of compound seal (3) respectively have an inner ring (8), two broach sealing strip (2) pressure equipment respectively are on two inner rings (8), two broach sealing strip (2) suit are on axis of rotation (1) external diameter, the surface of broach sealing strip (2) keeps 0.1 mm's clearance with axis of rotation (1) external diameter, there is annular cavity (7) that a cross-section is the U type in compound seal (3), intake pipe (4) communicate with each other with annular cavity (7) from compound seal (3) lateral wall, compound seal (3) are fixed together through fastening bolt (5) and equipment casing (6).

The utility model discloses a theory of operation:

the utility model provides a composite sealing device, there is a U type cavity in the composite sealing body, the intake pipe communicates with each other with the cavity, outside compressed air forms the pressure-fired in entering into U type cavity through the intake pipe, can effectively prevent inside the outside air admission casing of equipment casing, along with the long-time rotation operation of generator, the axis of rotation is possible to vibrate, will cause wearing and tearing to the broach sealing strip when vibration exceedes certain restriction, it is too big to lead to the clearance, if there is not this composite sealing's effect, outside contaminated air will be taken out into the generator. It is known that the rotating shaft (1) is a sliding bearing after extending out of the equipment shell (6), oil leakage is easy to occur at the oil seal of the bearing, leaked oil gas can permeate into the surrounding air, and if the composite seal does not exist, oil stains can be attached to the rotor and the stator winding in the generator after long-time operation, so that the insulation aging and the equipment failure rate are increased.

The utility model discloses technological effect:

the utility model discloses a sealed two kinds of combination pattern of broach and atmoseal, prevented outside air effectively and entered into inside the generator, the broach is sealed first, but long-time operation can cause the wearing and tearing of broach, lead to producing too big clearance between broach and the axis of rotation, if do not have airtight outside air will be taken in, it breaks down to get into to be stained with the greasy dirt on inside rotor and the stator winding that leads to of generator, but the pressure-fired that has had U type cavity just can solve this problem effectively, the cavity of pressure-fired can keep off outside air in sealing device outside, the inside clean compressed air of entering generator can not cause any adverse effect to the system. The utility model is suitable for a shaft end of small-size generator is sealed, the wide application in the thermoelectric industry.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a partially enlarged view.

The specific implementation mode is as follows:

as shown in figure 1, a composite sealing device of generator shaft end, by axis of rotation 1, broach sealing strip 2, composite seal body 3, intake pipe 4, fastening bolt 5 and equipment casing 6 are constituteed, as shown in figure 2, the both sides of composite seal body 3 respectively have an inner ring 8, two broach sealing strips 2 pressure equipment respectively are on two inner rings 8, two broach sealing strips 2 suit are on 1 external diameter of axis of rotation, the surface of broach sealing strip 2 keeps 0.1 mm's clearance with 1 external diameter of axis of rotation, there is an annular cavity 7 that the cross-section is the U type in the composite seal body 3, intake pipe 4 communicates with each other with annular cavity 7 from 3 lateral walls of composite seal body, composite seal body 3 passes through fastening bolt 5 and is fixed together with equipment casing 6.

In the generator rotation process, because of various reasons, axis of rotation 1 can vibrate, in case vibration will cause wearing and tearing to broach sealing strip 2 more than 0.1mm, lead to the clearance too big, outside compressed air enters into annular cavity 7 through intake pipe 4 and forms the pressure-fired, can effectively prevent that the outside air of equipment casing 6 from getting into inside the casing 6, we know that axis of rotation 1 is a slide bearing after stretching out equipment casing 6, the easy oil leak of oil blanket department of bearing, the oil gas that leaks can be diffused in the air around, if do not have this compound sealed existence, will be stained with the greasy dirt on generator inside rotor and the stator winding after long-time operation, cause insulating ageing and the rising of equipment fault rate.

Claims

1. A composite sealing device of a generator shaft end is characterized in that: by axis of rotation (1), broach sealing strip (2), composite seal (3), intake pipe (4), fastening bolt (5) and equipment casing (6) are constituteed, the both sides of composite seal (3) respectively have an inner ring (8), two broach sealing strip (2) pressure equipment respectively are on two inner ring (8), two broach sealing strip (2) suit are on axis of rotation (1) external diameter, the surface of broach sealing strip (2) keeps 0.1 mm's clearance with axis of rotation (1) external diameter, there is annular cavity (7) that a cross-section is the U type in composite seal (3), intake pipe (4) communicate with each other with annular cavity (7) from composite seal (3) lateral wall, composite seal (3) are together fixed through fastening bolt (5) and equipment casing (6).