Switching device applied to sealing of ball valve of pumped storage power station

Abstract

The invention discloses a switching device applied to sealing of a ball valve of a pumped storage power station, which comprises a hydraulic electromagnetic valve used for switching oil ways; the small hydraulic servomotor is connected with the hydraulic electromagnetic valve and used for driving the three-way valve; the three-way valve comprises a first circulation hole, a second circulation hole and a third circulation hole, the first circulation hole is connected with upstream pressure water of the ball valve, the second circulation hole is communicated with a downstream working sealing cavity of the ball valve, and the third circulation hole is communicated with the atmosphere; the position switch is used for detecting the position state of the small hydraulic servomotor; the flow meter is mounted on the water supply loop on the rear side of the second circulation hole and used for monitoring the water supply flow; the pressure sensor is installed on the water supply loop on the rear side of the second circulation hole and used for monitoring pressure changes; and the pipeline comprises a water supply pipe and an oil supply pipe and is used for realizing communication among the components. Effective retreating of ball valve sealing of the pumped storage power station can be achieved, and safety and reliability are good.

Description

Technical Field

[0001] This invention relates to the field of main inlet valve control technology for hydropower stations, specifically to a device for engaging and disengaging the ball valve seal in pumped storage power stations. Background Technology

[0002] Pumped storage power stations typically have a large ball valve installed before the generating unit as the inlet valve. To ensure the safety of unit maintenance and operation, the ball valve is generally equipped with upstream and downstream seals. The downstream working seal isolates the upstream high-pressure water source after the ball valve is closed, and is an important component to ensure the safe operation of the unit.

[0003] Currently, the upstream seals of ball valves in mainstream pumped storage power stations are generally manually operated, while the downstream seals rely on the hydraulic system for automatic control. Given the frequent start-ups and shutdowns of pumped storage units and the high frequency of ball valve seal operations, a device is needed to reliably control the seal operation and ensure its safe and stable operation. This device should also be able to analyze and monitor the seal's condition, thereby monitoring the equipment's health and improving the reliability and safety of pumped storage power station operation. Summary of the Invention

[0004] The purpose of this invention is to provide a device for engaging and disengaging the ball valve seal in a pumped-storage power station. It enables effective engagement and disengagement of the ball valve seal in pumped-storage power stations, offering high safety and reliability.

[0005] The technical solution adopted by this invention to solve its technical problem is: a device for engaging and disengaging the ball valve seal of a pumped storage power station, comprising: Hydraulic solenoid valves are used to switch oil circuits; A small hydraulic relay, connected to a hydraulic solenoid valve, is used to drive a three-way valve; A three-way valve includes a first flow hole, a second flow hole, and a third flow hole. The first flow hole is connected to the upstream pressure water of the ball valve, the second flow hole is connected to the downstream working sealing cavity of the ball valve, and the third flow hole is connected to the atmosphere. A position switch is used to detect the position status of the small hydraulic relay. A flow meter, installed in the water supply circuit behind the second flow hole, is used to monitor the water supply flow rate; A pressure sensor is installed on the water supply circuit behind the second flow hole to monitor pressure changes; Pipelines, including water supply pipes and oil supply pipes, are used to connect the aforementioned components.

[0006] In the aforementioned device for engaging and disengaging the ball valve seal in a pumped storage power station, the hydraulic solenoid valve is a two-position four-way solenoid valve with two operating states. When the hydraulic solenoid valve is in the engaging state, a small hydraulic actuator actuates to connect the first and second flow holes of the three-way valve. When the hydraulic solenoid valve switches to the disengaging state, the small hydraulic actuator actuates to connect the second and third flow holes of the three-way valve, and the pressurized water in the working sealing chamber is discharged to the atmosphere through the third flow hole, thus achieving disengagement.

[0007] In the aforementioned device for engaging and disengaging ball valve seals in pumped storage power stations, the small hydraulic relay is a double-acting cylinder structure.

[0008] In the aforementioned device for engaging and disengaging ball valve seals in pumped storage power stations, the three-way valve is a mechanical three-way ball valve.

[0009] In the aforementioned device for engaging or disengaging the ball valve seal of a pumped storage power station, the position switch is a proximity switch or a limit switch.

[0010] In the aforementioned device for engaging and disengaging ball valve seals in pumped storage power stations, the flow meter is a turbine flow meter or an electromagnetic flow meter.

[0011] In the aforementioned device for engaging and disengaging ball valve seals in pumped storage power stations, the pressure sensor is a resistance strain gauge or piezoresistive sensor.

[0012] In the aforementioned device for engaging and disengaging ball valve seals in pumped storage power stations, the pipeline is arranged in a combination of rigid metal pipes and flexible hoses.

[0013] In the aforementioned device for engaging and disengaging ball valve seals in pumped storage power stations, a signal acquisition module and a data analysis module are provided on one side of the flow meter and pressure sensor.

[0014] The beneficial effects of this invention are as follows: This invention enables the control of a small hydraulic relay via a hydraulic solenoid valve, allowing the small hydraulic relay to operate a three-way valve. This achieves effective deactivation and reactivation of the ball valve seal in a pumped storage power station, with good safety and reliability. Attached Figure Description

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention when it is sealed and put into operation; Figure 2 This is a schematic diagram of the structure when the seal is removed according to the present invention.

[0017] Legend: 1-Hydraulic solenoid valve, 2-Small hydraulic relay, 3-Three-way valve, 3.1-First flow hole, 3.2-Second flow hole, 3.3-Third flow hole, 4-Position switch, 5-Flow meter, 6-Pressure sensor, 7-Pipeline, 7.1-Water supply pipe, 7.2-Oil supply pipe. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Specific implementation examples are given below.

[0020] like Figures 1 to 2 As shown in the embodiment of the present invention, an activation / deactivation device for a ball valve seal in a pumped storage power station includes: Hydraulic solenoid valve 1 is used to switch the oil circuit; A small hydraulic relay 2 is connected to a hydraulic solenoid valve 1 and is used to drive a three-way valve 3; The three-way valve 3 includes a first flow hole 3.1, a second flow hole 3.2 and a third flow hole 3.3. The first flow hole 3.1 is connected to the upstream pressure water of the ball valve, the second flow hole 3.2 is connected to the downstream working sealing cavity of the ball valve, and the third flow hole 3.3 is connected to the atmosphere. Position switch 4 is used to detect the position status of the small hydraulic relay 2; Flow meter 5 is installed in the water supply circuit behind the second flow hole 3.2 to monitor the water supply flow rate; Pressure sensor 6 is installed on the water supply circuit behind the second flow hole 3.2 to monitor pressure changes; Pipeline 7, including water supply pipe 7.1 and oil supply pipe 7.2, is used to connect the above-mentioned components.

[0021] The hydraulic solenoid valve 1 is a two-position four-way solenoid valve. The hydraulic solenoid valve 1 has two working states. When the hydraulic solenoid valve 1 is in the sealed engagement state, the small hydraulic servo 2 is activated to connect the first flow hole 3.1 and the second flow hole 3.2 of the three-way valve 3. When the hydraulic solenoid valve 1 is switched to the sealed disengagement state, the small hydraulic servo 2 is activated to connect the second flow hole 3.2 and the third flow hole 3.3 of the three-way valve 3. The pressurized water in the working sealing chamber is discharged to the atmosphere through the third flow hole 3.3, realizing the sealed disengagement.

[0022] The small hydraulic relay 2 is a double-acting cylinder structure.

[0023] The three-way valve 3 is a mechanical three-way ball valve.

[0024] The position switch 4 is a proximity switch or a limit switch.

[0025] The flow meter 5 is a turbine flow meter or an electromagnetic flow meter.

[0026] The pressure sensor 6 is a resistance strain gauge or piezoresistive sensor.

[0027] The pipeline 7 is arranged in a combination of rigid metal pipes and flexible hoses.

[0028] The flow meter 5 and pressure sensor 6 are equipped with a signal acquisition module and a data analysis module on one side, which are connected via wired or wireless transmission. The signal acquisition module converts the physical quantities acquired by the flow meter 5 and pressure sensor 6 into digital signals to achieve data acquisition. The data analysis module can display and monitor the digital signals converted by the signal acquisition module, and further control the hydraulic solenoid valve based on the digital signals converted by the signal acquisition module.

[0029] The principle of this application is as follows: This application is mainly used for the activation and deactivation device of the ball valve seal in a pumped storage power station. The hydraulic solenoid valve 1 switches the oil circuit, controlling the movement direction of the small hydraulic relay 2. This application has two working states. When the hydraulic solenoid valve 1 is in the sealing activation state, the small hydraulic relay 2 actuates to connect the first flow hole 3.1 and the second flow hole 3.2 of the three-way valve 3. When the hydraulic solenoid valve 1 switches to the sealing deactivation state, the small hydraulic relay 2 actuates to connect the second flow hole 3.2 and the third flow hole 3.3 of the three-way valve 3. The pressurized water in the working sealing chamber is discharged to the atmosphere through the third flow hole 3.3, achieving sealing deactivation. The hydraulic solenoid valve 1 is connected to the oil circuit, with a working pressure of 6.4 MPa and a working voltage of 24 VDC. This solenoid valve has a two-position four-way electromagnetic switching function, an extremely short response time (≤20 ms), and is suitable for systems with frequent operation. The valve body is made of stainless steel, which is corrosion-resistant, and the sealing method is an O-type seal. It has an IP65 protection rating and can operate normally in harsh environments. When the hydraulic solenoid valve 1 is activated, it switches the oil circuit and drives the small hydraulic relay 2 to perform reciprocating motion. The small hydraulic servo 2 is a double-acting cylinder structure with a rated pressure of 6.4 MPa, suitable for hydraulic systems requiring high-precision control. The movement of the small hydraulic servo 2 drives the valve core of the three-way valve to switch via a mechanical connection, enabling the three-way valve to connect the first flow port 3.1 with the second flow port 3.2 or the second flow port 3.2 with the third flow port 3.3 under different operating conditions.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for engaging or disengaging the seal of a ball valve in a pumped storage power station, characterized in that, include: Hydraulic solenoid valve (1) is used to switch oil circuits; A small hydraulic relay (2) is connected to a hydraulic solenoid valve (1) and is used to drive a three-way valve (3). The three-way valve (3) includes a first flow hole (3.1), a second flow hole (3.2) and a third flow hole (3.3). The first flow hole (3.1) is connected to the upstream pressure water of the ball valve, the second flow hole (3.2) is connected to the downstream working sealing cavity of the ball valve, and the third flow hole (3.3) is connected to the atmosphere. Position switch (4) is used to detect the position status of the small hydraulic relay (2); A flow meter (5) is installed in the water supply circuit behind the second flow hole (3.2) to monitor the water supply flow rate; A pressure sensor (6) is installed on the water supply circuit behind the second flow hole (3.2) to monitor pressure changes; Pipeline (7), including water supply pipe (7.1) and oil supply pipe (7.2), is used to connect the above components.

2. The device for engaging and disengaging a ball valve seal in a pumped storage power station according to claim 1, characterized in that: The hydraulic solenoid valve (1) is a two-position four-way solenoid valve. The hydraulic solenoid valve (1) has two working states. When the hydraulic solenoid valve (1) is in the sealed engagement state, the small hydraulic relay (2) is activated to connect the first flow hole (3.1) and the second flow hole (3.2) of the three-way valve (3). When the hydraulic solenoid valve (1) is switched to the sealed disengagement state, the small hydraulic relay (2) is activated to connect the second flow hole (3.2) and the third flow hole (3.3) of the three-way valve (3). The pressurized water in the working sealing chamber is discharged to the atmosphere through the third flow hole (3.3), thus realizing the sealed disengagement.

3. The device for engaging and disengaging a ball valve seal in a pumped storage power station according to claim 1, characterized in that: The small hydraulic relay (2) is a double-acting cylinder structure.

4. The device for engaging and disengaging a ball valve seal in a pumped storage power station according to claim 1, characterized in that: The three-way valve (3) is a mechanical three-way ball valve.

5. The device for engaging and disengaging a ball valve seal in a pumped storage power station according to claim 1, characterized in that: The position switch (4) is a proximity switch or a limit switch.

6. The device for engaging and disengaging a ball valve seal in a pumped storage power station according to claim 1, characterized in that: The flow meter (5) is a turbine flow meter or an electromagnetic flow meter.

7. The device for engaging and disengaging a ball valve seal in a pumped storage power station according to claim 1, characterized in that: The pressure sensor (6) is a resistance strain gauge or piezoresistive sensor.

8. The device for engaging and disengaging a ball valve seal in a pumped storage power station according to claim 1, characterized in that: The pipeline (7) is arranged in a combination of rigid metal pipes and flexible hoses.

9. The device for engaging and disengaging a ball valve seal in a pumped storage power station according to claim 1, characterized in that: The flow meter (5) and pressure sensor (6) are equipped with a signal acquisition module and a data analysis module on one side.

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