Novel pivot sealing structure of water inlet valve

Abstract

The utility model provides a novel water inlet valve pivot sealing structure which comprises a water inlet valve body, a water inlet valve pivot and a sealing seat, the sealing seat is arranged on the side of the water inlet valve body, a circle of sealing groove is formed in the contact face between the sealing seat and the water inlet valve pivot, and a plurality of V-shaped sealing rings are arranged in the sealing groove. The V-shaped sealing ring is provided with a sealing gland, the sealing gland is provided with a protrusion, and the protrusion extends into the sealing groove to abut against the V-shaped sealing ring. And a plurality of locking bolts and at least one adjusting bolt are arranged between the sealing gland and the sealing seat. The sealing compression amount of the novel water inlet valve pivot sealing structure can be adjusted along with the increase of the operation time of a unit, the problem that the water inlet valve pivot sealing cannot be adjusted after being abraded is solved, the replacement period of the water inlet valve pivot sealing is effectively prolonged, the risk of unplanned shutdown of a hydropower station and a pump station is reduced, and the service life of the water inlet valve pivot sealing structure is prolonged. And favorable conditions are provided for continuous, safe and stable operation of the power station.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy and hydropower, and particularly relates to a novel water inlet valve pivot sealing structure. Background Art

[0002] As an important sealing component of the entire inlet valve, the pivot seal of the water inlet valve plays a vital role in ensuring the long-term safe and stable operation of the water inlet valve. When the pump-turbine unit, conventional mixed flow unit and water diversion project pump station are started and shut down, the water inlet valve needs to be opened and closed in coordination. Especially for the pump-turbine unit, due to the need to cooperate with the power grid for peak and frequency regulation, the water inlet valve is started and stopped frequently every day. The water inlet valve is subject to the entire static water pressure of the upstream pressure steel pipe at any time, and the operating conditions are complex. With the increase of operating time, the pivot seal of the water inlet valve will gradually wear out. In severe cases, the flow channel pressure water will leak along the pivot into the hydropower plant or pump station, destroying the working environment of the hydropower plant or pump station, and even damaging the live equipment near the water inlet valve. With the continuous increase in the proportion of new energy, accelerating the construction of a clean, low-carbon, safe and efficient energy system, and achieving carbon peak and carbon neutrality, higher requirements are put forward for the operating stability of hydropower stations and pump stations, among which the problem of water inlet valve pivot leakage is more urgent to be solved. Utility Model Content

[0003] The purpose of the utility model is to provide a novel water inlet valve pivot sealing structure for the above-mentioned water inlet valve pivot leakage problem, so as to effectively solve the water inlet valve pivot leakage problem after the unit is put into operation and extend the replacement period of the water inlet valve pivot seal.

[0004] To this end, the above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0005] A novel water inlet valve pivot sealing structure, comprising a water inlet valve body, a water inlet valve pivot and a sealing seat, characterized in that: a sealing seat is provided on the side of the water inlet valve body, a circle of sealing grooves is provided on the contact surface between the sealing seat and the water inlet valve pivot, and a plurality of V-shaped sealing rings are provided in the sealing grooves to enhance the sealing effect;

[0006] The V-shaped sealing ring is provided with a sealing gland, and the sealing gland is provided with a protrusion, and the protrusion extends into the sealing groove to resist the V-shaped sealing ring;

[0007] A plurality of locking bolts and at least one adjusting bolt are arranged between the sealing gland and the sealing seat; the locking bolts ensure that the sealing gland does not loosen during operation;

[0008] The cross section of the space surrounded by the protrusion and the sealing groove is larger than the cross section of the multi-channel V-shaped sealing ring. When the V-shaped sealing ring is worn to a certain extent, the compression amount of the V-shaped sealing ring can be adjusted by tightening the sealing gland by adjusting the bolt.

[0009] While adopting the above technical solutions, the present invention can also adopt or combine the following technical solutions:

[0010] As a preferred technical solution of the utility model: a stainless steel anti-wear plate is provided between the water inlet valve pivot and the V-shaped sealing ring to prevent the water inlet valve pivot from wearing.

[0011] As a preferred technical solution of the utility model: a water collecting box is provided on the side of the sealing seat, and the cavity formed by the water collecting box and the sealing seat wraps the sealing gland inside.

[0012] As a preferred technical solution of the utility model: a drainage pipe is provided at the lower part of the water collecting box to facilitate timely drainage of pivot leakage water.

[0013] As a preferred technical solution of the utility model: the V-shaped opening of the V-shaped sealing ring faces the high-pressure side of the flow channel.

[0014] The utility model provides a new type of water inlet valve pivot seal structure, which effectively improves the reliability of the water inlet valve pivot seal, ensures the sealing effect and does not cause any damage to the water inlet valve pivot; at the same time, the sealing compression can be adjusted as the unit operation time increases, which solves the problem that the water inlet valve pivot seal cannot be adjusted after wear, effectively prolongs the replacement cycle of the water inlet valve pivot seal, reduces the risk of unplanned shutdown of hydropower stations and pump stations, and provides favorable conditions for the continuous, safe and stable operation of the power station. In addition, by reducing or enlarging the sizes of the V-shaped sealing ring, sealing groove, sealing gland and the like according to a certain ratio, it can be applied to water inlet valves of different diameters and different water pressures, and has strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A cross-sectional view of a novel water inlet valve pivot seal structure provided by the utility model;

[0016] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0017] In the figure: 1-water inlet valve body; 2-water inlet valve pivot; 3-sealing seat; 4-water collecting tank; 5-adjusting bolt; 6-sealing cover; 61-protrusion; 7-stainless steel anti-wear plate; 8-V-shaped sealing ring; 9-locking bolt; 10-drain pipe. DETAILED DESCRIPTION

[0018] The utility model is further described in detail with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1As shown, a sealing seat 3 is installed on the water inlet valve body 1, and a V-shaped sealing ring 8 is arranged between the sealing seat 3 and the water inlet valve pivot 2. A stainless steel anti-wear plate 7 is arranged between the V-shaped sealing ring 8 and the water inlet valve pivot 2 to prevent the water inlet valve pivot 2 from being worn. The compression amount of the V-shaped sealing ring 8 is adjusted by the sealing gland 6 (the sealing gland 6 is provided with a protrusion 61, and the protrusion 61 extends into the sealing groove to resist the V-shaped sealing ring 8), and the sealing gland 6 is fixed with an adjusting bolt 5 and a locking bolt 9. At the same time, a water collecting box 4 is arranged outside the sealing gland 6, and a drain pipe 10 is arranged on the water collecting box 4 to facilitate the timely discharge of pivot leakage water.

[0020] 1) Prevent water leakage from the water inlet valve pivot:

[0021] When the unit is shut down or running, the high-pressure water in the flow channel leaks outward along the gap between the water inlet valve body 1 and the water inlet valve pivot 2.

[0022] In order to prevent the high-pressure water from leaking through the gap, a sealing seat 3 is installed on the inlet valve body 1. Multiple V-shaped sealing rings 8 are arranged between the sealing seat 3 and the inlet valve pivot 2. The opening direction of the V-shaped sealing ring 8 faces the high-pressure side of the flow channel. Under the action of the leaking high-pressure water, the V-shaped sealing ring 8 opens to both sides and respectively adheres to the stainless steel anti-wear plate 7 and the sealing seat 3 on the surface of the inlet valve pivot to play a sealing role. In the early stage of the unit commissioning, the compression amount of the V-shaped sealing ring 8 is controlled by adjusting the adjustment bolt 5 on the sealing gland 6 to ensure that the high-pressure water in the flow channel will not leak. After the adjustment, tighten the locking bolt 9 to ensure that the sealing gland 6 will not loosen when the inlet valve is opened or closed.

[0023] 2) Extend the replacement cycle of the water inlet valve pivot seal:

[0024] As the running time of the unit increases, the V-shaped sealing ring 8 will be worn to a certain extent after friction with the stainless steel anti-wear plate 7 on the water inlet valve pivot 2, and the sealing effect will be weakened, and pivot leakage may occur.

[0025] In order to solve the leakage caused by the wear of the pivot seal of the water inlet valve, the V-shaped sealing ring 8 is further compressed by tightening the adjusting bolt 5 on the sealing gland 6, so that the compression amount of the V-shaped sealing ring 8 is increased, thereby restoring the sealing effect, without stopping the unit to replace the pivot seal of the water inlet valve.

[0026] As the running time of the unit further increases, the wear of the V-shaped sealing ring 8 is further aggravated. At this time, the water leakage cannot be controlled by adjusting the compression amount of the sealing cover 6. The leakage of the water inlet valve pivot 2 can still be discharged to the appropriate position of the hydropower station or pumping station in time through the drain pipe 10 on the water collecting tank 4, so as to avoid the leakage of the water inlet valve pivot from damaging the working environment of the factory or affecting nearby equipment, thereby ensuring the safe operation of the unit. The operation and maintenance personnel can replace the water inlet valve pivot seal at a later time.

[0027] The above-mentioned specific implementation methods are used to explain the present invention and are only preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent substitutions, improvements, etc. made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A novel water inlet valve pivot sealing structure, comprising a water inlet valve body (1), a water inlet valve pivot (2), and a sealing seat (3), characterized in that: A sealing seat (3) is provided on the side of the water inlet valve body (1), a circle of sealing grooves is provided on the contact surface between the sealing seat (3) and the water inlet valve pivot (2), and a plurality of V-shaped sealing rings (8) are provided in the sealing grooves; The V-shaped sealing ring (8) is provided with a sealing gland (6), and the sealing gland (6) is provided with a protrusion (61), and the protrusion (61) extends into the sealing groove to abut against the V-shaped sealing ring (8); A plurality of locking bolts (9) and at least one adjusting bolt (5) are provided between the sealing gland (6) and the sealing seat (3); the cross section of the space surrounded by the protrusion (61) and the sealing groove is larger than the cross section of the multiple V-shaped sealing rings (8).

2. The novel water inlet valve pivot seal structure according to claim 1 is characterized in that: A stainless steel anti-wear plate (7) is provided between the water inlet valve pivot (2) and the V-shaped sealing ring (8).

3. The novel water inlet valve pivot seal structure according to claim 1 is characterized in that: A water collecting box (4) is provided on the side of the sealing seat (3), and the cavity formed by the water collecting box (4) and the sealing seat (3) wraps the sealing gland (6) therein.

4. The novel water inlet valve pivot seal structure according to claim 3 is characterized in that: A drainage pipe (10) is provided at the lower part of the water collecting tank (4).

5. The novel water inlet valve pivot seal structure according to claim 1 is characterized in that: The V-shaped opening of the V-shaped sealing ring (8) faces the high-pressure side of the flow channel.

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