CN216241046U

CN216241046U - Ball valve sealing operation water source pipeline structure

Info

Publication number: CN216241046U
Application number: CN202122920685.XU
Authority: CN
Inventors: 张芳; 吴继兵; 于鹏飞; 张兴宇; 姚文革
Original assignee: Harbin Electric Machinery Co Ltd
Current assignee: Harbin Electric Machinery Co Ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-04-08
Anticipated expiration: 2031-11-26

Abstract

The utility model discloses a ball valve sealing operation water source pipeline structure. The power station is provided with 6 sets which are respectively defined as 1# set-6 # set, every two sets share an upstream pressure steel pipe, standby water source water taking pipes of ball valves of the 1# set and the 2# set are taken from the pressure steel pipes of the power station, and a main operating water source water taking pipe is led from a first water taking main pipe combined by pressure steel pipe water conveying systems of the 4# set and the 6# set; the main operation water source water taking pipes of the ball valves of the 3# unit and the 4# unit are led from a second water taking main pipe combined by the pressure steel pipe water conveying systems of the 2# unit and the 6# unit; the main operation water source water taking pipes of the ball valves of the No. 5 unit and the No. 6 unit are led from a third water taking main pipe combined by the pressure steel pipe water delivery systems of the No. 2 unit and the No. 4 unit, and a manual isolation valve is arranged between the standby water source and the main water source. The working water source and the standby water source are combined to take water. The installation and the maintenance are convenient, and the universality is good.

Description

Ball valve sealing operation water source pipeline structure

Technical Field

The utility model relates to the field of water turbines, in particular to a ball valve sealing operation water source pipeline structure for a hydropower station.

Background

The hydraulic self-excited vibration is represented by the periodic fluctuation of the gradually increased amplitude of the pressure steel pipe in front of the ball valve, the maximum water pressure can reach twice the maximum hydrostatic pressure, and meanwhile, the ball valve body and the pipeline connected with the pressure steel pipe are accompanied by obvious shaking and abnormal sound. The hydraulic self-excited vibration phenomenon caused by abnormal working seal of the ball valve occurs in a plurality of power stations recently, the ball valve and a pressure pipeline system are seriously influenced, and the safety of the power stations is greatly threatened.

The reason why the self-excited vibration is generated is: when the ball valve is in a closed state, the working seal of the ball valve is not tightly put into or the seal putting-in and putting-out operation cavity is subjected to series pressure, so that the working seal ring is in a critical state of a pressing action, the disturbance of a pipeline system causes the repeated putting-in and putting-out of the working seal, and finally, the hydraulic self-excited vibration phenomenon is caused. The operation water source of the prior ball valve working seal is all taken from the pressure steel pipe of the device, when the pressure of the seal operation water source is changed, the pressure in the pressure steel pipe is influenced, and the ball valve seal water taking system which is produced and manufactured in recent years is basically the scheme. At present, large pumped storage power stations are more, the general water head is higher, and the pipeline pressure fluctuation is large due to frequent start-stop operation, so that the requirements on the structural safety, the reliability and the operation performance of the ball valve are higher. The ball valve sealing water taking system is invented aiming at the severe operating conditions of a high-water head large-scale pumped storage power station after ball valve sealing water taking systems of a conventional power station and the high-water head pumped storage power station are contrastively analyzed.

The ball valve work sealing operation water source is taken from the pressure steel pipe of the machine, and the problems existing in the use are that: when the pressure is reduced due to the abrasion of the sealing sliding surface of the working seal of the ball valve, the damage of a soft seal on the sealing ring or the leakage of a sealing operation water pipeline system, the pressure in the local pressure steel pipe can be influenced, and the self-oscillation is caused.

In view of the above factors that may cause self-excited vibration, certain measures need to be taken to improve the reliability of the working sealing operation during the structural design of the water inlet ball valve, but due to the use conditions and the sealing life, the possibility of water leakage and channeling of the working sealing operation cavity cannot be completely avoided, and therefore more importantly, necessary measures are taken in the aspect of sealing operation water sources to avoid damage caused by the occurrence of self-excited vibration.

Disclosure of Invention

The utility model aims to provide a ball valve sealing operation water source pipeline structure which can replace the prior structure, fundamentally solve the problem of self-oscillation caused by a sealing operation water source and is suitable for a high-water-head pumped storage power station with severe operation conditions. The purpose of the utility model is realized by the following scheme: the power station is provided with 6 sets which are respectively defined as 1# set-6 # set, every two sets share an upstream pressure steel pipe, standby water source water taking pipes of ball valves of the 1# set and the 2# set are taken from the pressure steel pipes of the power station, and a main operating water source water taking pipe is led from a first water taking main pipe combined by pressure steel pipe water conveying systems of the 4# set and the 6# set; the main operation water source water taking pipes of the ball valves of the 3# unit and the 4# unit are led from a second water taking main pipe combined by the pressure steel pipe water conveying systems of the 2# unit and the 6# unit; the main operation water source water taking pipes of the ball valves of the No. 5 unit and the No. 6 unit are led from a third water taking main pipe combined by the pressure steel pipe water delivery systems of the No. 2 unit and the No. 4 unit, and a manual isolation valve is arranged between the standby water source and the main water source. The working water source and the standby water source are combined to take water.

Technical effects

1. After the ball valve seals a main operating water source and is taken from the water taking main pipe of other pressure steel pipe water delivery systems, when the pressure is reduced due to abrasion of a sealing sliding surface of a working seal of the ball valve, damage of a soft seal on a sealing ring or leakage of a sealing operating water pipeline system, the pressure in the pressure steel pipe of the ball valve cannot be influenced, and therefore self-oscillation is avoided.

2. The utility model has the advantages of simplicity, convenient installation and maintenance and good universality.

Drawings

FIG. 1 is a schematic diagram of a six-machine ball valve seal operating water source piping system of the present invention.

FIG. 2 is a schematic diagram of a single machine ball valve seal operating water source piping system of the present invention.

The notation in the figure is: 1-a manual isolation valve; 2-a spare water source water taking pipe; 3-main operation water source intake pipe; 4-pressure steel pipe; 5-a first water intake main; 6-a second water intake main; 7-third water intake manifold.

The specific implementation mode is as follows:

the utility model is further described with reference to the following figures and detailed description.

A ball valve sealing operation water source pipeline structure as shown in fig. 1 and 2, which is composed of a manual isolation valve 1, a standby water source water intake pipe 2 and a main operation water source water intake pipe 3. Taking a water delivery system with 6 units in a power station, wherein every two units share an upstream pressure steel pipe (namely one pipe and two units) as an example, a 1# and 2# unit ball valve standby water source water taking pipe 2 is taken from a local pressure steel pipe 4, and a main operation water source water taking pipe 3 is led from a first water taking main pipe 5 combined by the 4# and 6# unit pressure steel pipe water delivery systems; the main operation water source water taking pipe 3 of the ball valve of the No. 3 and No. 4 units is led from a second water taking main pipe 6 combined by the pressure steel pipe water delivery systems of the No. 2 and No. 6 units; the ball valve main operation water source water intake pipe 3 of the No. 5 and No. 6 units is led from a third water intake header pipe 7 combined with the pressure steel pipe water delivery systems of the No. 2 and No. 4 units; a manual isolation valve 1 is arranged between the standby water source and the main water source, and the working water source and the standby water source are combined to take water. The pipeline structure cuts off the connection between the working sealing operation water source water intake pipe 3 and the local pressure steel pipe 4, and can avoid the self-oscillation phenomenon.

The working principle is as follows: in order to improve the reliability of the operation of the working seal of the ball valve, an operating water source of the ball valve seal is provided with a standby water source, a standby water source water taking pipe is taken from a pressure steel pipe of the ball valve seal, a main operating water source water taking pipe is taken from a water taking main pipe combined by other pressure steel pipe water conveying systems, and the working water source and the standby water source are combined to take water. The pipeline system cuts off the connection between the working sealing operation water source water intake pipe and the pressure steel pipe of the machine, and can avoid the self-oscillation phenomenon.

The foregoing has outlined rather broadly the principles and features of the present invention in connection with the accompanying drawings. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims

1. The utility model provides a ball valve seal operation water source pipeline structure, characterized by: the power station is provided with 6 units which are respectively defined as 1# unit-6 # unit, every two units share an upstream pressure steel pipe, a standby water source water taking pipe (2) of ball valves of the 1# unit and the 2# unit is taken from the pressure steel pipe (4) of the power station, and a main operation water source water taking pipe (3) is led from a first water taking main pipe (5) combined by a pressure steel pipe water conveying system of the 4# unit and the 6# unit; the main operation water source water taking pipe (3) of the ball valves of the 3# unit and the 4# unit is led from a second water taking main pipe (6) combined by the pressure steel pipe water conveying systems of the 2# unit and the 6# unit; the main operation water source water intake pipe (3) of the ball valves of the No. 5 unit and the No. 6 unit is led from a third water intake header pipe (7) combined by the pressure steel pipe water delivery systems of the No. 2 unit and the No. 4 unit, a manual isolation valve (1) is arranged between the standby water source and the main water source, and the working water source and the standby water source are combined to take water.