CN215596402U

CN215596402U - Water stop steel belt for reducing water leakage of main shaft seal of water turbine

Info

Publication number: CN215596402U
Application number: CN202120099144.2U
Authority: CN
Inventors: 周伍; 文宇; 董文婷; 王庆书; 吴定平
Original assignee: China Yangtze Power Co Ltd
Current assignee: China Yangtze Power Co Ltd
Priority date: 2021-01-14
Filing date: 2021-01-14
Publication date: 2022-01-21
Anticipated expiration: 2031-01-14

Abstract

The utility model discloses a water stop steel belt for reducing the water leakage of a main shaft seal of a water turbine, which is characterized in that: the water-stopping steel belt comprises a water-stopping steel belt body, wherein the water-stopping steel belt body comprises a steel ring, a water-stopping ring and a tooth sheet; the steel ring is sleeved on the outer surface of the large shaft and matched with the floating ring on the outer surface of the large shaft; the water retaining ring is connected to the outer surface of the steel ring; the outer surface of the steel ring on one side of the water retaining ring is connected with a plurality of tooth sheets. The device has solved that current main shaft work sealing device water consumption and water leakage are great, and top cap drainage system work load is higher, causes the problem of water logging equipment accident easily after taking place the drainage trouble, has simple structure, need not to change current main shaft seal structure, and the installation of being convenient for is maintained, can effectively reduce the characteristics of main shaft seal's water leakage.

Description

Water stop steel belt for reducing water leakage of main shaft seal of water turbine

Technical Field

The utility model belongs to the technical field of main shaft sealing of water turbines, and particularly relates to a water stopping steel belt for reducing water leakage of a main shaft sealing of a water turbine.

Background

The main shaft seal of the water turbine is a sealing device at the position of a dynamic and static separation part between a main shaft of a rotating part of the water turbine and a supporting cover of a fixed part of the water turbine, is used for reducing or preventing external river water from leaking from a gap between the rotating part and the fixed part, avoids the backflow of the river water, ensures the safe and stable operation of a unit, and is one of key parts of a water turbine generator set. The main shaft seal is divided into a working seal and a maintenance seal, and is respectively used when the unit is operated and the unit is stopped and maintained. The general main shaft seal refers to a main shaft working seal, commonly called a water seal, clean water (tap water) with pressure slightly larger than river water is introduced into a sealing surface to realize the function of sealing the river water, a small part of the clean water at the sealing surface flows outwards into the river, and a large part of the clean water flows inwards into a water collecting tank of a top cover of a unit and is finally discharged by a drainage pump.

For self-compensating end face spindle seals which are adopted in the current industry in a large quantity, under the condition of better sealing performance and longer service life, larger water consumption and water leakage are also brought. The work load of a top cover drainage system is directly increased due to overlarge water leakage, and once the drainage system fails, a flooding equipment accident is easily caused, so that the safe and stable operation of the whole unit is directly damaged.

At present, except for passive precautionary measures such as regular maintenance of main shaft sealing equipment and reinforced redundancy construction of a drainage system, no effective measure for actively reducing the water leakage amount of the main shaft sealing exists. Therefore, it is urgently needed to design a water stopping steel strip for reducing the water leakage of the main shaft seal of the water turbine so as to solve the problems.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a water-stop steel belt for reducing the water leakage of a main shaft seal of a water turbine, solves the problems that the water consumption and the water leakage of the existing main shaft working seal equipment are large, the working load of a top cover drainage system is high, and the accident of water flooding equipment is easily caused after a drainage fault occurs, and has the characteristics of simple structure, no need of changing the existing main shaft seal structure, convenience in installation and maintenance and capability of effectively reducing the water leakage of the main shaft seal.

In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: a water-stopping steel belt for reducing the sealing water leakage of a main shaft of a water turbine comprises a water-stopping steel belt body, wherein the water-stopping steel belt body comprises a steel ring, a water retaining ring and a tooth sheet; the steel ring is sleeved on the outer surface of the large shaft and matched with the floating ring on the outer surface of the large shaft; the water retaining ring is connected to the outer surface of the steel ring; the outer surface of the steel ring on one side of the water retaining ring is connected with a plurality of tooth sheets.

Preferably, the steel ring comprises two semicircular split arc panels; the ends of the two split arc panels are connected into a steel ring through clamping plates and fastening bolts.

Preferably, the water retaining ring comprises two semicircular arc-shaped panels; the two arc-shaped panels are respectively welded with the surfaces of the two split arc-shaped panels.

Preferably, the water retaining ring is perpendicular to the outer surface of the steel ring.

Preferably, the number of the tooth sheets is 36, and the 36 tooth sheets are circumferentially connected to the outer surface of the steel ring at equal intervals; the tooth piece is obliquely arranged and forms an inclined included angle with the lower plane of the steel ring.

Further, the inclined included angle can be adjusted according to specific working conditions, and a 45-degree included angle is preferred.

Preferably, the tooth piece is positioned below the water retaining ring, and the top of the tooth piece is not contacted with the lower surface of the water retaining ring.

Preferably, the upper end surface of the water stop steel belt body is flush with the upper end surface of the floating ring; the outer diameter of the water stop steel belt body is 2 mm-3 mm smaller than the inner diameter of the floating ring.

The water stop steel strip for reducing the water leakage of the main shaft seal of the water turbine has the following beneficial effects:

the device is a pure mechanical device, has simple and reliable structure and convenient installation and maintenance, and does not change the existing main shaft sealing structure; the inherent rotation of the large shaft of the water turbine is directly used as a driving force, and power input is not needed;

2, the device generates certain water pressure at the inner side of the main shaft seal, increases the resistance to water leakage, reduces the water consumption of the main shaft seal while reducing the water leakage of the main shaft seal, lightens the working load of a top cover drainage system, ensures the running safety of a unit and also achieves the effects of energy conservation and emission reduction;

3, the device generates certain water pressure at the inner side of the main shaft seal, and the certain water pressure is balanced with the river water pressure at the outer side of the main shaft seal, so that the working environments at the inner side and the outer side of the main shaft seal tend to be consistent, the influence of inherent defects such as eccentric wear of a seal block is greatly reduced, and the sealing performance and the service life of the main shaft seal are favorably improved.

Drawings

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

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

FIG. 2 is a schematic diagram of a structure in which the present invention is embodied.

Fig. 3 is a schematic view of a spindle seal according to a use scenario of the present invention.

The reference numbers in the figures are: the device comprises a steel ring 1, a split cambered plate 11, a clamping plate 12, a water retaining ring 2, a tooth piece 3, a large shaft 4, a floating ring 5, a support ring 6, a sealing cover 7, cleaning water 8 and river water 9.

Detailed Description

As shown in fig. 3, in the spindle sealing structure applied to the present device, when clean water is introduced into the floating ring 5, the floating ring 5 floats upwards by 0.05mm to 0.1mm under the jacking action of the bottom water pressure, and the clean water leaks to both sides of the floating ring 5. The cleaning water flowing to the outside river cavity effectively prevents the river water from leaking inwards, and the effect of sealing the river water is realized, and the water leakage amount is small and accounts for about 20% of the water consumption of the cleaning water due to the obstruction of the pressure of the river water; the cleaning of the water flowing to the inner side drainage cavity is not obstructed, the water leakage amount is large and accounts for about 80 percent of the water consumption of the cleaning water; arrows in the figure indicate the flow direction of the cleaning water 8 and the flow direction of the river water 9.

As shown in fig. 1-2, a water-stopping steel strip for reducing the water leakage of a main shaft seal of a water turbine comprises a water-stopping steel strip body, wherein the water-stopping steel strip body comprises a steel ring 1, a water retaining ring 2 and a tooth piece 3; the steel ring 1 is sleeved on the outer surface of the large shaft 4 and matched with the floating ring 5 on the outer surface of the large shaft 4; the water retaining ring 2 is connected to the outer surface of the steel ring 1; the outer surface of the steel ring 1 at one side of the water retaining ring 2 is connected with a plurality of tooth sheets 3.

Preferably, the steel ring 1 comprises two semicircular split arc panels 11; the end parts of the two split arc panels 11 are connected into a steel ring 1 through clamping plates 12 and fastening bolts.

Preferably, the water retaining ring 2 comprises two semicircular arc-shaped panels; the two arc-shaped panels are respectively welded with the surfaces of the two split arc-shaped panels 11.

Preferably, the water retaining ring 2 is perpendicular to the outer surface of the steel ring 1.

Preferably, the number of the tooth sheets 3 is 36, and the 36 tooth sheets 3 are circumferentially connected to the outer surface of the steel ring 1 at equal intervals; the tooth piece 3 is obliquely arranged and forms an inclined included angle with the lower plane of the steel ring 1.

Preferably, the tooth blade 3 is positioned below the water retaining ring 2, and the top of the tooth blade 3 is not contacted with the lower surface of the water retaining ring 2.

Preferably, the upper end surface of the water stop steel belt body is flush with the upper end surface of the floating ring 5; the outer diameter of the water stop steel belt body is 2 mm-3 mm smaller than the inner diameter of the floating ring 5.

The working principle of the water stopping steel strip for reducing the water leakage of the main shaft seal of the water turbine is as follows:

the water stop steel belt body is arranged on a large shaft 4 on the inner side of the main shaft seal of the unit, the outer diameter of the water stop steel belt body and the inner diameter of the floating ring 5 keep a clearance of 2 mm-3 mm, and the upper end faces of the water stop steel belt body and the floating ring are flush; when the unit operates, the large shaft 4 rotates clockwise to synchronously drive the water stop steel belt to push water flow to move downwards along the axial direction, certain water pressure is formed on the inner side of the floating ring 5, the water leakage resistance of the spindle seal is increased, and the effect of reducing the water leakage amount of the spindle seal is realized.

The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the utility model.

Claims

1. The utility model provides a reduce stagnant water steel band of hydraulic turbine main shaft seal water leakage volume which characterized in that: the water-stopping steel belt comprises a water-stopping steel belt body, wherein the water-stopping steel belt body comprises a steel ring (1), a water-retaining ring (2) and a tooth piece (3); the steel ring (1) is sleeved on the outer surface of the large shaft (4) and matched with the floating ring (5) on the outer surface of the large shaft (4); the water retaining ring (2) is connected to the outer surface of the steel ring (1); the outer surface of the steel ring (1) at one side of the water retaining ring (2) is connected with a plurality of tooth sheets (3).

2. The water stop steel strip for reducing the water leakage of the main shaft seal of the water turbine as claimed in claim 1, wherein: the steel ring (1) comprises two semicircular split arc panels (11); the end parts of the two split arc panels (11) are connected into a steel ring (1) through clamping plates (12) and fastening bolts.

3. The water stop steel strip for reducing the water leakage of the main shaft seal of the water turbine as claimed in claim 1, wherein: the water retaining ring (2) comprises two semicircular arc-shaped panels; the two arc-shaped panels are respectively welded with the surfaces of the two split arc-shaped panels (11).

4. The water stop steel strip for reducing the water leakage of the main shaft seal of the water turbine as claimed in claim 1, wherein: the water retaining ring (2) is perpendicular to the outer surface of the steel ring (1).

5. The water stop steel strip for reducing the water leakage of the main shaft seal of the water turbine as claimed in claim 1, wherein: the tooth sheets (3) are circumferentially connected to the outer surface of the steel ring (1) at equal intervals; the tooth piece (3) is obliquely arranged and forms an inclined included angle with the lower plane of the steel ring (1).

6. The water stop steel strip for reducing the water leakage of the main shaft seal of the water turbine as claimed in claim 1, wherein: the tooth piece (3) is positioned below the water retaining ring (2), and the top of the tooth piece (3) is not contacted with the lower surface of the water retaining ring (2).

7. The water stop steel strip for reducing the water leakage of the main shaft seal of the water turbine as claimed in claim 1, wherein: the upper end surface of the water stop steel belt body is flush with the upper end surface of the floating ring (5); the outer diameter of the water stop steel belt body is 2 mm-3 mm smaller than the inner diameter of the floating ring (5).