CN213117480U - Combined sealing device suitable for low water head water turbine - Google Patents

Abstract

The utility model belongs to the technical field of the hydraulic turbine technique and specifically relates to a composite sealing device suitable for low head hydraulic turbine. The combined sealing device comprises a drainage structure and a water retaining structure, wherein the drainage structure is arranged above the rotating wheel, the water retaining structure is arranged below the drainage structure, the drainage structure comprises sealing bodies and sealing sleeves which are in threaded fit in different rotation directions, and the water retaining structure comprises a rubber pad and a gasket. This simple structure, material saving uses simultaneously and seals effectually, overhauls and maintains the convenience, uses in low water head unit, and the effect is showing.

Description

Combined sealing device suitable for low water head water turbine

Technical Field

The utility model belongs to the technical field of the hydraulic turbine technique and specifically relates to a composite sealing device suitable for low head hydraulic turbine.

Background

The low-head water turbine has the advantages that the water leakage quantity above the rotating wheel is small and the water pressure is low due to the fact that the opening of the rotating wheel is large and the water head is low in operation, the water pressure before the main shaft is sealed can be easily ignored in the design of the unit due to the low water head of the low-head water turbine, the main shaft of the unit of a general low-head power station leaks water greatly, and the operation safety of the unit of the hydropower station is endangered if the self-flowing; the low head hydraulic turbine is because the big runner crown structure of runner overflow is difficult for seting up runner crown decompression outlet, and the outlet is seted up improperly sometimes, and the runner outlet can not play the decompression effect but plays pump water pressure boost effect, and the water leakage of low head hydraulic turbine runner epicoele is big, if adopts conventional seal structure, obviously extravagant material, unit maintenance cycle length increases the power station maintenance cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve the not enough of prior art, provide a combination seal suitable for low head hydraulic turbine.

The utility model discloses a concrete technical scheme as follows:

the utility model provides a combined seal suitable for a low water head water turbine, which comprises a drainage structure and a water retaining structure, wherein the drainage structure is arranged above a runner, the water retaining structure is arranged below the drainage structure,

the drainage structure comprises a sealing body and a sealing sleeve which are matched with threads in different screwing directions, and the water retaining structure comprises a rubber pad and a gasket.

Preferably, the thread of the sealing body is a right spiral thread, and the thread of the sealing sleeve is a left spiral thread.

Preferably, the combined sealing device further comprises a maintenance seal and a drain pipe, the maintenance seal is arranged below the water retaining structure, and the drain pipe is arranged at the upper part of the sealing body.

The service seal is a conventional arrangement known in the art.

Compared with the prior art, the utility model beneficial effect be:

the utility model discloses simple structure, material saving uses simultaneously and seals effectually, overhauls and maintains the convenience, uses in low water head unit, and the effect is showing.

Drawings

Fig. 1 is a schematic view of the combined sealing device suitable for the low head water turbine of the present invention;

reference numerals:

1. drainage structure, 2, manger plate structure, 3, overhaul sealed, 4, drain pipe, 5, seal, 6, seal cover.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

The water turbine consists of a fixed part and a rotating part, wherein the fixed part comprises a seat ring, a top cover and the like, and the rotating part comprises a main shaft, a rotating wheel and the like. This novel combination seal structure sets up between rotating part and fixed part, and water retaining structure 2 sets up in overhauing sealed 3 tops, and drainage structures 1 sets up in the runner top.

This novel combined seal is applicable to lower flood peak hydraulic turbine, combined seal device includes drainage structures 1 (drainage pressure relief structure) and manger plate structure 2 (manger plate pressure relief structure), drainage structures 1 sets up the top at the runner, manger plate structure 2 sets up the below at drainage structures 1, combined seal device is still sealed 3 and drain pipe 4 including overhauing, overhauing sealed 3 below that sets up at manger plate structure 2, drain pipe 4 sets up the upper portion at seal 5.

Drainage structure includes different soon to screw-thread fit's seal 5 and seal cover 6, the screw thread of seal 5 is right spiral line, the screw thread of seal cover 6 is left spiral line. The water retaining structure 2 consists of a wear-resistant rubber pad and an adjusting gasket.

When the water turbine operates, the maintenance seal does not work; the water leakage enters the water retaining pressure reducing structure through maintenance and sealing, and the wear-resistant rubber pad can rapidly reduce the water pressure of the water leakage and prevent most of water from continuously flowing upwards; the water flow which is not completely blocked continues to enter the drainage pressure reduction structure, the leaked water continues to be reduced in pressure under the centrifugal action of the reverse rotation direction threads, and finally, the non-pressure water flows out through the drainage pipe, so that the sealing effect is achieved.

The pressure water above the rotating wheel is reduced in pressure through the combined seal in two steps and is finally discharged through the drain pipe, the sealing effect is finally achieved, and the safe and stable operation of the unit is guaranteed.

Conventional technical knowledge in the field can be adopted in the content which is not described in detail in the present invention.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art will understand that modifications and equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of them shall fall within the scope of the claims of the present invention.

Claims (3)

1. A combined sealing device suitable for a low water head water turbine is characterized by comprising a drainage structure and a water retaining structure, wherein the drainage structure is arranged above a rotating wheel, the water retaining structure is arranged below the drainage structure,

the drainage structure comprises a sealing body and a sealing sleeve which are matched with threads in different screwing directions, and the water retaining structure comprises a rubber pad and a gasket.

2. The combination seal of claim 1, wherein the seal body threads are right hand threads and the seal gland threads are left hand threads.

3. The combination seal of claim 1, further comprising a service seal disposed below the water dam and a drain disposed in an upper portion of the seal body.

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