Flat pressing opening device for high-pressure ball valve of 700MW hydroelectric generating set

Abstract

The utility model discloses a 700MW hydroelectric generating set high-pressure ball valve flat pressing opening device which comprises a high-pressure ball valve, the oil inlet end of the high-pressure ball valve is connected with an oil inlet pipe, the oil outlet end of the high-pressure ball valve is connected with an oil outlet pipe, and the high-pressure ball valve is connected with a needle valve in parallel through a first pressure measuring module and a second pressure measuring module. The oil inlet pipe and the oil outlet pipe are respectively communicated with the needle valve through the second pressure measuring module and the first pressure measuring module, so that the opening torque of the high-pressure ball valve is reduced, the abrasion of a sealing surface is reduced, the loss of a valve shaft is reduced, and hidden defects such as valve shaft deformation and abnormal sealing abrasion caused by manual high-torque operation of the valve are eliminated; the method is mainly suitable for a large-drift-diameter manual main ball valve of a hydraulic system, the sealing effect is guaranteed, the service life of the high-pressure ball valve is prolonged, and electric power safety production is guaranteed essentially.

Description

Technical Field

[0001] The utility model relates to the technical field of hydropower maintenance, in particular to a flat-pressure opening device for a high-pressure ball valve of a 700MW hydraulic generator set. Background Technique

[0002] In domestic medium and large-sized hydropower stations with a single installed capacity of 700MW, the hydraulic speed regulation system is the core execution system for control and regulation. The safety and reliability of the speed regulation system are directly related to the safety of power production and national economic production. Basically, all the medium and high-pressure ball valves used in the hydraulic speed regulation systems of existing domestic medium and large-sized hydropower stations are worm-driven ball valves. By amplifying the manual operation force through worm drive, the purpose of opening and closing the valve is achieved. This type of valve is widely used in the hydraulic speed regulation system.

[0003] When the valve is in the closed state, one side is pressurized and the other side is not pressurized, and the pressure difference reaches 6.3 Mpa. When directly opening the valve in this state, the valve shaft bears a large torque. With the increase in the number of opening and closing operations, especially the number of opening operations, the wear of the valve seal and the valve shaft will be aggravated. The most direct impact is that the valve has internal leakage and the valve shaft has micro-deformation, and at the same time, the switch limit of the valve shifts. Content of the Utility Model

[0004] The utility model provides a flat-pressure opening device for a high-pressure ball valve of a 700MW hydraulic generator set, aiming to solve the problem of opening the valve in the state where one side has pressure and the other side has no pressure after the valve of the hydraulic speed regulation system of medium and large-sized hydropower stations is closed. Through the developed opening device, the two sides are quickly opened in a flat-pressure manner, eliminating the resistance generated by the high pressure difference. Only by overcoming the static friction resistance between the valve sealing surface and the seal can the high-pressure ball valve be easily opened, achieving the purpose of protecting the valve shaft and the seal of the valve, and ultimately ensuring the safety of power production.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A flat-pressure opening device for a high-pressure ball valve of a 700MW hydraulic generator set includes a high-pressure ball valve. The oil inlet end of the high-pressure ball valve is connected to an oil inlet pipe, and the oil outlet end of the high-pressure ball valve is connected to an oil outlet pipe. The high-pressure ball valve is shunted with a needle valve through a first pressure measurement module and a second pressure measurement module, and the oil inlet pipe and the oil outlet pipe are respectively communicated with the needle valve through the second pressure measurement module and the first pressure measurement module.

[0007] Preferably, the oil outlet end of the needle valve is communicated with the oil outlet pipe through the first pressure measurement module, and the oil inlet end of the needle valve is communicated with the oil inlet pipe through the second pressure measurement module.

[0008] More preferably, the first pressure measurement module includes a first pressure measurement joint and a first pressure measurement pipe connected in series.

[0009] Further, one end of the first pressure measuring joint is communicated with the oil outlet pipe, and the other end of the first pressure measuring joint is communicated with the oil outlet end of the needle valve through a first pressure measuring pipe.

[0010] Furthermore, the second pressure measuring module includes a second pressure measuring joint and a second pressure measuring pipe connected in series.

[0011] Specifically, one end of the second pressure measuring joint is communicated with the oil inlet pipe, and the other end of the second pressure measuring joint is communicated with the oil inlet end of the needle valve through a second pressure measuring pipe.

[0012] More specifically, a pressure gauge is provided on the second pressure measuring pipe.

[0013] Advantages of the utility model:

[0014] Before opening the high-pressure ball valve, the utility model equalizes the pressure on both sides of the high-pressure ball valve through the first pressure measuring module and the second pressure measuring module, achieving the purpose of non-destructive opening, eliminating the loss of the valve shaft strength, seal loss and life loss of the valve when opening with pressure difference, fundamentally realizing the equipment safety of the valve in the speed regulation hydraulic system, and also eliminating the hidden defects such as valve shaft deformation and abnormal seal wear caused by manually operating the valve with a large torque, and even eliminating the pressure leakage accident caused by valve shaft fracture. Description of the drawings

[0015] Figure 1 is a connection schematic diagram of the utility model;

[0016] In the figure: 1, the first pressure measuring joint; 2, the second pressure measuring joint; 3, the first pressure measuring pipe; 4, the second pressure measuring pipe; 5, the needle valve; 6, the high-pressure ball valve; 7, the pressure gauge. Specific implementation manners

[0017] As follows, the embodiments will be further described with reference to the drawings.

[0018] As Figure 1 shown, as a preferred Embodiment 1, a device for equalizing the pressure and opening a high-pressure ball valve of a 700MW hydro-generating unit includes a high-pressure ball valve 6. The oil inlet end of the high-pressure ball valve 6 is connected to the oil inlet pipe, and the oil outlet end of the high-pressure ball valve 6 is connected to the oil outlet pipe. The high-pressure ball valve 6 is shunted with a needle valve 5 through a first pressure measuring module and a second pressure measuring module, and the oil inlet pipe and the oil outlet pipe are respectively communicated with the needle valve 5 through the second pressure measuring module and the first pressure measuring module. Before opening the high-pressure ball valve 6, first open the needle valve 5, connect the oil inlet pipe and the oil outlet pipe through the first pressure measuring module and the second pressure measuring module to equalize the pressure, and then the high-pressure ball valve 6 can be easily opened after stabilization.

[0019] The oil outlet end of the needle valve 5 is communicated with the oil outlet pipe through the first pressure measuring module, and the oil inlet end of the needle valve 5 is communicated with the oil inlet pipe through the second pressure measuring module.

[0020] The first pressure measurement module includes a first pressure measurement joint 1 and a first pressure measurement pipe 3 connected in series.

[0021] One end of the first pressure measurement joint 1 is communicated with the oil outlet pipe, and the other end of the first pressure measurement joint 1 is communicated with the oil outlet end of the needle valve 5 through the first pressure measurement pipe 3, ensuring the communication between the oil outlet end of the needle valve 5 and the oil outlet pipe.

[0022] The second pressure measurement module includes a second pressure measurement joint 2 and a second pressure measurement pipe 4 connected in series.

[0023] One end of the second pressure measurement joint 2 is communicated with the oil inlet pipe, and the other end of the second pressure measurement joint 2 is communicated with the oil inlet end of the needle valve 5 through the second pressure measurement pipe 4, ensuring the communication between the oil inlet end of the needle valve 5 and the oil inlet pipe.

[0024] A pressure gauge 7 is provided on the second pressure measurement pipe 4, which is convenient for observation. When the high-pressure ball valve 6 is closed, it is ensured that there is no internal leakage in the device and it does not affect the cut-off performance of the main high-pressure ball valve 6.

[0025] As a preferred embodiment 2, a flat-pressure non-destructive opening method is carried out by using the above-mentioned flat-pressure opening device for the high-pressure ball valve of a 700MW hydraulic generator set, including the following steps:

[0026] The function of the needle valve 5 is to ensure the safety during the opening process and the effective withdrawal of the device after opening;

[0027] Initially, the high-pressure ball valve 6 is in the closed state, and the needle valve 5 is in the closed state;

[0028] Before the high-pressure ball valve 6 needs to be opened, the needle valve 5 is opened. When the pressure gauge 7 shows a pressure of 6.3 Mpa, the pressure is quickly equalized at this time, and the high-pressure ball valve 6 is opened;

[0029] After the high-pressure ball valve 6 is opened, the needle valve 5 is closed, completing the full process of the flat-pressure opening of the hydraulic high-pressure ball valve of the speed regulation system.

[0030] As a preferred embodiment 3, the first pressure measurement joint 1 is detachably and sealingly installed with the oil inlet pipe, and the second pressure measurement joint 2 is detachably and sealingly installed with the oil outlet pipe. After disassembly, a plugging mechanism can be installed at the joint installation place, and the corresponding pressure measurement pipe is also detachably installed with the pressure measurement joint.

[0031] This device can be fixedly installed on both sides of the high-pressure ball valve 6 through stainless steel pressure measurement pipes. Fixed installation has risks. If the installation quality is not good, loosening of the connecting parts and sealing failure may occur after long-term operation, and leakage may cause new system leakage points. Based on this consideration, it can also be used as an auxiliary solution when the on-site valve is not easy to open. The pressure measurement hose connection method is adopted. After the valve is normally opened, the first pressure measurement pipe 3 and the first pressure measurement head 1 are disconnected, the second pressure measurement pipe 4 and the second pressure measurement head 2 are disconnected, and the device is removed, which will not increase additional leakage risks to the system operation.

[0032] Working principle of the utility model:

[0033] The utility model equalizes the pressure on both sides of the high-pressure ball valve before opening through the first pressure measurement module and the second pressure measurement module, achieving the purpose of lossless opening, eliminating the loss of the valve shaft strength, seal loss and life loss of the valve during opening with differential pressure, fundamentally realizing the equipment safety of the valve in the speed regulation hydraulic system, and also eliminating the generation of hidden defects such as valve shaft deformation and abnormal seal wear caused by manually operating the valve with great torque, and even eliminating the pressure leakage accident caused by valve shaft fracture.

Claims

1. A 700MW hydroelectric generator set high-pressure ball valve flat pressure opening device, comprising a high-pressure ball valve (6), wherein the oil inlet end of the high-pressure ball valve (6) is connected to the oil inlet pipe, and the oil outlet end of the high-pressure ball valve (6) is connected to the oil outlet pipe, characterized in that: The high-pressure ball valve (6) is connected in parallel with a needle valve (5) via a first pressure measuring module and a second pressure measuring module, and the oil inlet pipe and the oil outlet pipe are respectively connected to the needle valve (5) via the second pressure measuring module and the first pressure measuring module.

2. A 700MW hydroelectric generator set high-pressure ball valve horizontal pressure opening device according to claim 1, characterized in that: The oil outlet end of the needle valve (5) is connected to the oil outlet pipe via a first pressure measuring module, and the oil inlet end of the needle valve (5) is connected to the oil inlet pipe via a second pressure measuring module.

3. A 700MW hydroelectric generator set high-pressure ball valve horizontal pressure opening device according to claim 2, characterized in that: The first pressure measuring module comprises a first pressure measuring joint (1) and a first pressure measuring tube (3) connected in series.

4. A 700MW hydroelectric generator set high-pressure ball valve horizontal pressure opening device according to claim 3, characterized in that: One end of the first pressure measuring joint (1) is connected to the oil outlet pipe, and the other end of the first pressure measuring joint (1) is connected to the oil outlet end of the needle valve (5) through the first pressure measuring pipe (3).

5. A 700MW hydroelectric generator set high-pressure ball valve horizontal pressure opening device according to claim 4, characterized in that: The second pressure measuring module comprises a second pressure measuring joint (2) and a second pressure measuring tube (4) connected in series.

6. A 700MW hydroelectric generator set high-pressure ball valve horizontal pressure opening device according to claim 5, characterized in that: One end of the second pressure measuring joint (2) is connected to the oil inlet pipe, and the other end of the second pressure measuring joint (2) is connected to the oil inlet end of the needle valve (5) through the second pressure measuring pipe (4).

7. A 700MW hydroelectric generator set high-pressure ball valve horizontal pressure opening device according to claim 6, characterized in that: The second pressure measuring tube (4) is provided with a pressure gauge (7).

Images