CN-117006294-B - Large ball valve expansion joint water collecting device

CN117006294BCN 117006294 BCN117006294 BCN 117006294BCN-117006294-B

Abstract

The invention provides a large-scale ball valve expansion joint water collecting device, which is characterized in that an outer ring of a ball valve expansion joint is sleeved with a water collecting tank, the water collecting tank comprises an upper shell and a lower shell, the upper shell and the lower shell are fixedly connected through a flange combination surface to form an annular water collecting tank, a sealing ring is arranged between the upper shell and the outer wall of a pipeline in front of and behind the expansion joint, a water collecting cavity is formed between the water collecting tank and the outer wall of the ball valve expansion joint, a water blocking ring concentric with the ball valve expansion joint is arranged in the water collecting cavity, a blocking layer is arranged at the top of the water blocking ring, the water blocking ring is arranged at the outer side of a horizontal water leakage point of the ball valve expansion joint, the lower shell is connected with a drain pipe, and water leakage is discharged into a drain open channel through the drain pipe. The large ball valve expansion joint water collecting device provided by the invention is simple and portable, is convenient to install and detach, can resist instant large water pressure water leakage and reduce the water pressure capacity of the large ball valve expansion joint water collecting device, meets the daily collection and drainage requirements of a small amount of water leakage, is convenient to observe a water outlet, and is convenient to judge the development trend of water leakage.

Inventors

GUO XIANGUANG
ZANG KEJIA
JIANG PEIDONG
LIU ZUOTING
WANG XIAO
JIA RUIQING
ZHAO WEIWEI
DUAN JIAYI

Assignees

国网新源集团有限公司
河南国网宝泉抽水蓄能有限公司

Dates

Publication Date: 20260508
Application Date: 20230727

Claims (5)

1. The water collecting device of the large ball valve expansion joint is characterized in that a water collecting groove is sleeved on an outer ring of the ball valve expansion joint, the water collecting groove comprises an upper shell (51) and a lower shell (52), the upper shell (52) and the lower shell (52) are fixedly connected through a flange combination surface (53) to form an annular water collecting groove, and a sealing ring (505) is arranged between the upper shell (52) and the outer walls of a pipeline in front of and behind the expansion joint; a water collecting cavity (501) is formed between the water collecting tank and the outer wall of the ball valve expansion joint, a water retaining ring (502) concentric with the ball valve expansion joint is arranged in the water collecting cavity (501), a blocking layer (504) is arranged at the top of the water retaining ring (502), the water retaining ring (502) is arranged at the outer side of a horizontal water leakage point of the ball valve expansion joint, at least two water outlets (507) are arranged on the lower shell (52), the two water outlets (507) are respectively arranged at two sides of the water retaining ring (502), the water outlets (507) are connected with a drain pipe (503) at the outer side, a blocking layer (504) is formed by rubber sheets at the top of the water retaining ring (502), the rubber sheets are uniformly fixed at the top of the water retaining ring (502), the positions of the plurality of rubber sheets are staggered with each other, the rubber sheets of the second layer correspond to the interval of the rubber sheets of the first layer, the rubber sheets of the third layer correspond to the interval of the second layer to form a staggered multi-layer structure, after the water leakage sprayed horizontally, the water leakage is sprayed outwards, and no pressure leakage is formed through the reduction of the plurality of rubber sheets, and then discharged into the drain open channel through a drain pipe (503).
2. The large ball valve expansion joint water collecting device according to claim 1, wherein the barrier layer (504) is a brush structure composed of a hard multi-layer brush.
3. The large ball valve expansion joint water collecting device according to claim 1, wherein the upper housing (51) and the lower housing (52) are made of aluminum, and an oxidation preventing layer is provided on the surface layer of the aluminum housing.
4. The large ball valve expansion joint water collecting device according to claim 1, wherein the water retaining ring (502) and the blocking layer (504) are higher than the water collecting cavity (501), and the top of the blocking layer (504) is attached to the outer wall of the pipeline.
5. The large ball valve expansion joint water collecting device according to claim 1, wherein one side of the upper shell (51) and the lower shell (52) is hinged through a hinge, and the other side is provided with a flange combination surface (53).

Description

Large ball valve expansion joint water collecting device Technical Field The invention belongs to the technical field of water leakage prevention of ball valve expansion joints, and particularly relates to a large ball valve expansion joint water collecting device. Background The structure of the expansion joint of the main water inlet ball valve of the pumped storage power station unit is shown in figure 1, and the expansion joint is formed by matching 3 sealing support rings with a U-shaped seal and 2O-shaped seals and is fixed by 24M 32 bolts. The telescopic joint has the function of solving the problem of ball valve displacement caused by temperature and water thrust changes, and is also convenient for overhauling and assembling and disassembling the ball valve and the downstream working seal thereof. The O-shaped seal of the expansion joint is static seal, so that water seepage along a seal supporting annular gap in the vertical direction is prevented, the U-shaped seal is dynamic seal, and water seepage along the downstream extension section of the ball valve in the horizontal direction is prevented. When the ball valve is closed, the water pressure in the volute is 1.0Mpa, and after the ball valve is opened, the water pressure in the volute is 6.4Mpa, and the pressure in the U-shaped sealing cavity is changed due to the change of the volute pressure, so that the U-shaped sealing elastic deformation is changed, and the water stopping effect is realized. Before the ball valve is opened, the bypass valve is opened or the working seal is withdrawn to charge the volute to the horizontal pressure, the volute pressure is instantaneously increased from 1.0Mpa to 5.5Mpa, and the elastic deformation time of the U-shaped seal is delayed from the rising time of the water pressure, so that a pressure water flow is sprayed out from the U-shaped seal along the horizontal direction, the expansion joint water leakage phenomenon is caused, and the water leakage at the moment has the characteristics of short time, high water pressure and high instantaneous flow. In addition, during daily operation, a small amount of water leakage inevitably flows out along the downstream extension section of the ball valve and the wall of the volute, so that a small amount of water dripping is kept for a long time below the ball valve, and water accumulation on the ground is caused. The water leakage of the expansion joint affects the automatic elements around the ball valve body and below the expansion joint, which possibly causes the short circuit or the grounding of the automatic elements, meanwhile, water accumulation on the ground is caused by water leakage, the risk of slipping easily occurs for personnel, and the ground is polluted by long-term water leakage, so that water stains are generated. Disclosure of Invention Aiming at the problems that the U-shaped sealing part of the expansion joint instantaneously leaks water along the horizontal direction, the water leakage time is short, the water pressure is high, and the instantaneous flow is high, the invention provides the large ball valve expansion joint water collecting device which is convenient to install and detach and can reduce the instantaneous water leakage pressure of the U-shaped sealing part. The water collecting device for the large ball valve expansion joint comprises a water collecting tank sleeved on an outer ring of the ball valve expansion joint, wherein the water collecting tank comprises an upper shell and a lower shell, the upper shell and the lower shell are fixedly connected through flange combination surfaces to form an annular water collecting tank, a sealing ring is arranged between the upper shell and the outer wall of a pipeline in front of and behind the expansion joint, a water collecting cavity is formed between the water collecting tank and the outer wall of the ball valve expansion joint, a water blocking ring concentric with the ball valve expansion joint is arranged in the water collecting cavity, a blocking layer is arranged at the top of the water blocking ring, the water blocking ring is arranged on the outer side of a horizontal water leakage point of the ball valve expansion joint, at least two water outlets are arranged on the lower shell, the two water outlets are respectively positioned on two sides of the water blocking ring, the outer sides of the water outlets are connected with a drain pipe, and water leakage is discharged into a water draining open channel through the drain pipe. Further, the barrier layer is a brush structure formed by a hard multi-layer brush. Further, the top of the water retaining ring is provided with a blocking layer formed by rubber sheets, the rubber sheets are uniformly fixed at the top of the water retaining ring, and the positions of the multi-layer rubber sheets are staggered. Further, the upper and lower cases are aluminum cases, and an oxidation preventing layer is provided on the surface layer of th