CN201031764Y - Non-contact metal seal structure of turbine main shaft - Google Patents

Abstract

The utility model relates to a non-contact metal sealing structure for a main shaft of a hydraulic turbine, comprising: a main shaft, a shaft sleeve and a sealing seat body, a shaft sleeve is fixedly installed on the main shaft, and a bearing bush is fastened on the inner ring of the sealing seat and several grooves are formed. The lower end of the seal seat body is connected with an inspection seal body, and the side of the seal inspection seat body close to the shaft sleeve is embedded with an inspection seal. A sealed drainage pipe is connected to the groove on the bottom or upper layer of the body. Its advantages are: the seal seat of the shaft seal is not in contact with the shaft sleeve, which reduces unnecessary wear and prolongs the service life of the main shaft seal; solves the problem of poor sealing performance of the hydraulic seal caused by unstable water pressure. Stability problem; no cooling or lubrication is required during normal turbine operation, which can reduce production costs and has a good market development prospect.

Description

Non-contact metal seal structure of turbine main shaft

technical field

The utility model belongs to the technical field of water turbine manufacturing, in particular to a non-contact metal sealing structure for a main shaft of a water turbine with simple structure, reliable sealing performance and long service life.

Background technique

The main function of the main shaft seal of the turbine is to block water leakage in the gap between the rotating part and the fixed part of the turbine. The quality of the sealing effect of the main shaft of the turbine directly affects the stable operation of the unit. At present, the commonly used main shaft seal form of known water turbines is a hydraulic seal, which uses water pressure to lift the seal block and rub against the wear plate, thereby preventing the passage of water and achieving the purpose of sealing. The disadvantages of hydraulic seals are: unstable sealing performance due to unstable water pressure; sand or solid matter sometimes exists in the water, which is easy to make the shaft sleeve and sealing seat (seal block and wear plate) ) between increased wear and tear, reducing the service life of the seal; in addition, due to the limited material of the seal block itself, there is an aging problem, which will also affect the reliability of the spindle seal.

Contents of the invention

The utility model provides a non-contact metal sealing structure for a main shaft of a hydraulic turbine with simple structure, reliable sealing performance and long service life in order to solve the technical problems existing in the known technology.

The technical scheme that the utility model takes for solving the technical problem existing in the known technology is:

The non-contact metal seal structure of the main shaft of the water turbine, including: the main shaft, the shaft sleeve and the sealing seat body, is characterized in that: the shaft sleeve made of metal material is fixed on the main shaft, the bearing bush is fastened on the inner ring of the sealing seat and several Groove, the lower end of the seal seat body is connected with an inspection seal body through studs, the seal inspection seat body is embedded with an inspection seal on the side close to the shaft sleeve, the inner side of the bearing bush of the seal seat body, the inner side surface of the inspection seal seat and the shaft sleeve There is a gap between them, and a sealing drainage pipe is connected to the groove of the sealing seat body.

The utility model can also adopt the following technical measures:

The inner ring of the sealing seat is formed with at least three grooves.

A sealing drainage pipe is connected to the groove on the uppermost layer of the sealing seat body, and a sealing drainage pipe may also be connected to the groove on the lowermost layer of the sealing seat body.

The gap between the inner surface of the bearing bush of the sealing seat body and the shaft sleeve is 0.6-0.8mm.

The gap between the inner side of the maintenance seal seat and the shaft sleeve is 1.8-2.0mm.

The bearing shell of the sealing seat has a dovetail structure.

The shaft sleeve is a shaft sleeve made of stainless steel.

The advantages and positive effects of the utility model are: because the utility model provides a gap between the main shaft sleeve and the sealing seat body and the maintenance sealing seat body, the sealing seat body of the shaft seal, the maintenance sealing body and the shaft sleeve The parts are not in contact, which reduces unnecessary wear and prolongs the service life of the main shaft seal; it does not need to seal clean water, and solves the problem of unstable sealing performance of the hydraulic seal caused by unstable water pressure; the sealing structure is in the No cooling or lubrication is required during normal water turbine operation, which can reduce production costs; in addition, the utility model has a simple and reasonable design structure, reliable sealing performance, good social and economic benefits, and has a market development prospect.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is a sectional view along A-A of Fig. 1 .

In the figure: 1. Stud; 2. Nut; 3. Seal body; 3-1. Groove; 4. Shaft sleeve; 5. Inspection seal body; 6. Sealing strip; Plug; 9. Gasket; 10. Bearing bush; 11. Main shaft; 12. Seal drain pipe; 13. Gap.

Detailed ways

In order to further understand the invention content, characteristics and effects of the present utility model, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Please refer to Figure 1 and Figure 2, the non-contact metal seal structure of the main shaft of the hydraulic turbine, including: the main shaft 11, the shaft sleeve 4 and the sealing seat 3, the shaft sleeve 4 made of stainless steel is fixed on the main shaft 11, and the sealing seat 3 A dovetail-shaped bearing bush 10 is fastened on the inner ring and at least three grooves 3-1 are formed, and two symmetrically distributed sealing drain pipes 12 are connected to the groove 3-1 at the bottom or the top layer of the sealing seat body . The lower end of the sealing seat body is tightly connected with the inspection sealing seat body 5 through the stud 1 and the nut 2, the inspection sealing seat body is fixed on the top cover, and the connection between the sealing seat body 3 and the inspection sealing seat body 5 is also provided with a The manufactured sealing strip 6. A maintenance seal 7 is embedded on the side of the seal maintenance seat body 5 close to the shaft sleeve 4, and the maintenance seal 7 adopts an air shroud type seal, and the air pressure is 0.5-0.8 MPa. When the water turbine unit is shut down, the maintenance seal 7 is inflated and inflated to closely fit the main shaft, so as to achieve the purpose of maintenance seal. There is a gap 13 between the inner surface of the sealing seat bearing bush 10, the inner surface of the maintenance sealing seat 5 and the shaft sleeve 4, so as to form a gap 13 between the shaft sleeve 4 of the rotating part and the sealing seat bearing bush 10 of the stationary part and the inspection sealing seat 5. touch. The gap between the inner side of the bearing bush of the sealing seat and the shaft sleeve is 0.6-0.8 mm, and the gap between the inner side of the maintenance seal seat and the shaft sleeve is 1.8-2.0 mm. A screw plug 8 and a washer 9 for adjusting the inspection seal 7 are installed in the radial direction on the outer circumference of the inspection seal seat body 5 .

The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model, All belong to the scope of the technical solution of the utility model.

Claims (7)

1. hydraulic turbine main shaft non-contact type shape metallic leak-proof structure, comprise: main shaft, axle sleeve and sealing pedestal, it is characterized in that: the axle sleeve that is fixed with metallic material system on the main shaft, tighten intrinsic bearing shell and be shaped on several grooves at sealing pedestal inner ring, sealing pedestal lower end is connected with maintenance sealing pedestal by double-screw bolt, sealing maintenance pedestal is embedded with the maintenance sealing near axle sleeve one side, be provided with the gap between described sealing seat body bearing shell inner side surface, maintenance sealing pedestal inner side surface and the axle sleeve, on the groove of sealing pedestal, be connected with the sealing waste pipe.

2. hydraulic turbine main shaft non-contact type shape metallic leak-proof structure according to claim 1 is characterized in that: described sealing pedestal inner ring is shaped on three grooves at least.

3. hydraulic turbine main shaft non-contact type shape metallic leak-proof structure according to claim 1 is characterized in that: be connected with the sealing waste pipe on the groove of the sealing pedestal the superiors, be connected with the sealing waste pipe on the undermost groove of sealing pedestal.

4. hydraulic turbine main shaft non-contact type shape metallic leak-proof structure according to claim 1 is characterized in that: the gap between described sealing seat body bearing shell inner side surface and the axle sleeve is 0.6-0.8mm.

5. hydraulic turbine main shaft non-contact type shape metallic leak-proof structure according to claim 1 is characterized in that: the gap between described maintenance sealing pedestal inner side surface and the axle sleeve is 1.8-2.0mm.

6. hydraulic turbine main shaft non-contact type shape metallic leak-proof structure according to claim 1 is characterized in that: described sealing seat body bearing shell is the dovetail shaped structure.

7. hydraulic turbine main shaft non-contact type shape metallic leak-proof structure according to claim 1 is characterized in that: described axle sleeve is the axle sleeve of stainless steel material system.

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