A hydraulic control system for an incident pressure reducing valve device

Abstract

The utility model provides a kind of hydraulic control system for accident pressure regulating valve equipment, including hydraulic control cartridge valve, solenoid valve and hydraulic control check valve.Liquid control cartridge valve control cavity is connected with solenoid valve, for keeping closed state when unit is operated;Hydraulic control check valve is connected with oil drain pipe and solenoid valve, for closing oil drain port in reset state;Solenoid valve then controls the communication state between above-mentioned valve according to external electric signal, realizes the accurate reset or input action of accident pressure regulating valve.Compared with the low oil pressure control scheme of existing spring, spool structure, the utility model has the advantages of high structure integration, strong action reliability, rapid response and good control safety, especially suitable for long-term operation condition under the accident control response requirement high water turbine governing system.

Description

Technical Field

[0001] This utility model relates to the field of control technology for emergency pressure regulating valve equipment, and in particular to a hydraulic control system for emergency pressure regulating valve equipment. Background Technology

[0002] The turbine speed control system is a core component of the stable operation of a hydropower station. Among them, the emergency pressure distribution valve is a key actuator that performs the guide vane closing action in an emergency. The response speed and reliability of its control level are directly related to the safety of the entire unit.

[0003] Currently, the CVZT digital turbine governor, widely used in hydropower stations, relies on hydraulic logic cartridge technology to achieve efficient control of the guide vanes. The emergency pressure regulating valve, a key component of the governor, is typically controlled using a traditional combination of a solenoid valve, a low-pressure valve, and a hydraulically controlled valve. The low-pressure valve is often a spool valve, with a spring providing reset force on one side and a pressure oil chamber for control on the other.

[0004] However, in this configuration, the spring will deform due to prolonged compression. Specifically, during normal unit operation, the hydraulic control chamber is continuously pressurized, and the spool valve remains stationary, causing the spring to be in a compressed state for an extended period. This makes its elasticity prone to fatigue decay, making it difficult to provide sufficient restoring force in emergency situations. Furthermore, this configuration also leads to the spool valve core easily sticking or jamming due to the low-pressure valve remaining inactive for extended periods, severely impacting the reliability of the response. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a hydraulic control system for emergency pressure regulating valve equipment. To achieve the above objectives, this utility model adopts the following technical solution:

[0006] A hydraulic control system for an emergency pressure distribution valve device, the system comprising: a hydraulically controlled cartridge valve, a solenoid valve connected to an oil inlet pipe, and a hydraulically controlled check valve;

[0007] in:

[0008] The hydraulically controlled cartridge valve is configured to be connected to the control oil source of the solenoid valve and the pressure regulating valve in a selective manner, and to be in the closed state when the unit equipment connected to the emergency pressure regulating valve is operating normally;

[0009] The hydraulic check valve is configured to be connected to the drain pipe and the solenoid valve respectively, so that when the solenoid valve returns to the reset state, the solenoid valve and the hydraulic check valve are connected to each other, so that the drain of the hydraulic check valve is in a closed state.

[0010] The solenoid valve is configured to receive external electrical signals, enabling it to selectively communicate with pilot-operated cartridge valves and pilot-operated check valves in response to external signals.

[0011] Furthermore, the control chamber of the hydraulic cartridge valve is interconnected with the solenoid valve, so that pressurized oil from the inlet pipe can move into the control chamber after passing through the solenoid valve.

[0012] Furthermore, the other end of the hydraulic cartridge valve is connected to the control oil source of the pressure regulating valve, so that the control oil source from the pressure regulating valve moves outward after passing through the hydraulic cartridge valve.

[0013] Furthermore, the hydraulic control check valve is configured as an integrated block structure, and the oil circuit of the integrated block is connected to the oil drain pipe and the solenoid valve respectively.

[0014] Furthermore, the integrated block structure is equipped with a channel network to achieve efficient distribution of control oil, discharge oil, and feedback oil.

[0015] Furthermore, when the hydraulically controlled cartridge valve and the hydraulically controlled check valve are interconnected and the solenoid valve is in the reset state, the pressure oil from the solenoid valve moves to the hydraulically controlled cartridge valve and the hydraulically controlled check valve respectively, causing the hydraulically controlled cartridge valve to be in the closed state and the hydraulically controlled check valve to be in the closed state, thereby causing the pressure oil to move to the emergency pressure regulating valve equipment, and thus causing the emergency pressure regulating valve equipment to be in the reset state.

[0016] Furthermore, when the solenoid valve is activated, the solenoid valve oil circuit is switched, and the oil discharge circuit of the hydraulic control check valve is connected, and the emergency pressure regulating valve device reset chamber is opened for oil discharge.

[0017] Furthermore, the solenoid valve is a two-position two-way or two-position three-way valve, with two stable states: operation and reset.

[0018] Furthermore, the hydraulic cartridge valve has a throttling orifice in its control chamber to reduce hydraulic shock and improve control stability.

[0019] Furthermore, the entire system is rigidly connected to the emergency pressure regulating valve via flanges and bolts, ensuring fluid circuit sealing and structural stability.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This invention includes a hydraulically controlled cartridge valve, a solenoid valve connected to the oil inlet pipe, and a hydraulically controlled check valve. The hydraulically controlled cartridge valve is configured to selectively connect to the control oil sources of the solenoid valve and the pressure regulating valve, ensuring it remains closed during normal operation of the unit equipment connected to the emergency pressure regulating valve. The hydraulically controlled check valve is configured to connect to the oil outlet pipe and the solenoid valve, ensuring that when the solenoid valve returns to its reset state, it connects to the hydraulically controlled check valve, thus closing the oil outlet of the hydraulically controlled check valve. The solenoid valve is configured to receive external electrical signals, allowing it to selectively connect to the hydraulically controlled cartridge valve and the hydraulically controlled check valve upon receiving an external signal. Compared to existing low-oil-pressure control schemes using a spring-slide valve structure, this invention offers advantages such as high structural integration, strong operational reliability, rapid response, and good control safety, making it particularly suitable for turbine speed control systems with high emergency control response requirements under long-term operating conditions. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is a schematic diagram of the overall structure of the hydraulic control system and the emergency pressure regulating valve device combined in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall structure of the hydraulic control system according to an embodiment of the present invention.

[0025] In the above attached figures: emergency pressure regulating valve device 10, emergency pressure regulating valve device control oil source 20, oil drain pipe 30, hydraulic control system 100, hydraulically controlled cartridge valve 1, solenoid valve 2, hydraulically controlled check valve 3. Detailed Implementation

[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0027] To better understand the purpose, structure, and function of this utility model, the following detailed description of a hydraulic control system for an emergency pressure regulating valve device is provided in conjunction with the accompanying drawings.

[0028] like Figure 1 As shown, the hydraulic control system 100 includes a hydraulically controlled cartridge valve 1, a solenoid valve 2, and a hydraulically controlled check valve 3, which are interconnected and installed in the same integrated block structure 6. In this embodiment, the hydraulically controlled cartridge valve 1 is connected to the solenoid valve 2 and the emergency pressure regulating valve device 10 via pipelines, allowing the main control chamber of the hydraulically controlled cartridge valve 1 (not shown) to receive pressurized oil from the inlet pipe 40. Furthermore, the hydraulically controlled check valve 3 is connected to the drain pipe 30 and forms a control linkage with the solenoid valve 2.

[0029] In this configuration, when the solenoid valve 2 is in the reset state, the pressure oil from the oil inlet pipe 40 enters the hydraulic control cartridge valve 1 and the hydraulic control check valve 3 after being opened by the solenoid valve 2, so that the hydraulic control cartridge valve 1 is kept closed and the oil outlet of the hydraulic control check valve 3 is closed, thereby ensuring that the emergency pressure distribution valve equipment 10 is in a stable reset state.

[0030] In one embodiment, such as Figure 1 As shown, the control chamber of the hydraulically controlled cartridge valve 1 is directly connected to the solenoid valve 2, with one end of the solenoid valve 2 connected to the oil inlet pipe 40. In this configuration, when the solenoid valve 2 returns to its original position, pressurized oil enters the control chamber of the hydraulically controlled cartridge valve 1 through its internal oil passage, thus keeping the valve core (not shown in the figure) of the hydraulically controlled cartridge valve 1 in the closed state. In this way, during normal operation of the unit (not shown in the figure), the solenoid valve 2 connects to the pressurized oil from the oil inlet pipe 40, the control chamber remains pressurized, the cartridge valve core closes under pressure, and control oil cannot enter the emergency pressure distribution valve device 10's input chamber.

[0031] According to a preferred embodiment of the present invention, such as Figure 1 As shown, the main passage of the hydraulically controlled cartridge valve 1 is connected to the control oil source 20 of the emergency pressure regulating valve device, and its other end is connected to the input chamber of the emergency pressure regulating valve device 10. Under normal operation, the hydraulically controlled cartridge valve 1 is in the closed state. Under emergency conditions, it opens when the control chamber loses pressure, allowing the control oil source 20 to supply oil to the emergency pressure regulating valve device 10.

[0032] In this configuration, when the solenoid valve 2 receives an external shutdown or accident signal and switches, the control chamber of the hydraulic cartridge valve 1 loses pressure, and the main valve core opens under the pressure of the control oil source 20 of the accident pressure regulating valve equipment, thereby allowing the control oil to quickly enter the input chamber of the accident pressure regulating valve equipment 10 and complete the closing action of the guide vane (not shown in the figure).

[0033] According to a preferred embodiment of this utility model, the hydraulically controlled check valve 3 is housed within an integrated block structure and forms a channel network connection with the oil drain pipe 30 and the solenoid valve 2. This facilitates centralized pipe routing, reduces connection errors, lowers leakage risk, and enables rapid reversal. In this manner, when the solenoid valve 2 is in the reset state, the hydraulically controlled check valve 3 receives pressurized oil from the oil inlet pipe 40. This oil pressure closes the drain port of the hydraulically controlled cartridge valve 1, blocking oil discharge from the reset chamber and maintaining the emergency pressure regulating valve device 10 in a stable open position.

[0034] In one embodiment, such as Figure 1As shown, the integrated block structure has three pre-set channels for control oil, drain oil, and feedback oil. Through reasonable spatial layout and machining precision, it ensures independent and efficient operation of multiple oil circuits and simplifies the overall structure. Specifically, the oil is quickly switched to the relevant parts of the hydraulically controlled cartridge valve 1 and check valve 3 through a three-dimensional pipeline network inside the integrated block, minimizing response delay and realizing real-time control of the emergency pressure regulating valve device 10.

[0035] In one embodiment, such as Figure 2 As shown, when the solenoid valve 2 is in the reset state, the pressure oil from the oil inlet pipe 40 will enter the control chamber of the hydraulic cartridge valve 1 and the oil inlet of the hydraulic check valve 3 respectively, so that the hydraulic cartridge valve 1 is kept closed and the oil outlet of the check valve 2 is closed, thereby controlling the oil to enter the reset chamber of the emergency pressure distribution valve device 10.

[0036] In this configuration, control oil enters the return chamber, keeping the guide vanes open; the engagement chamber allows for oil discharge, ensuring stable operation of the unit (not shown in the figure); the entire return state is controlled by the hydraulic circuit rather than the mechanical spring, improving long-term reliability.

[0037] According to a preferred embodiment of the present invention, such as Figure 2 As shown, when solenoid valve 2 receives an electrical signal and switches its operation, the internal oil circuit switches, preventing pressurized oil from entering the control chamber of hydraulically controlled cartridge valve 1. The valve core opens due to pressure loss, and simultaneously, the drain port of hydraulically controlled check valve 3 is opened, activating the emergency pressure regulating valve. In this configuration, the main oil circuit of hydraulically controlled cartridge valve 1 is open, allowing control oil to enter the activation chamber and close the guide vane; the drain channel of hydraulically controlled check valve 3 is open, allowing oil to drain from the return chamber, and the guide vane moves rapidly, completing the emergency shutdown.

[0038] According to a preferred embodiment of the present invention, such as Figure 2 As shown, the solenoid valve 2 is preferably a two-position two-way or two-position three-way valve, each having two stable states: actuation and reset. In this way, during equipment operation, the solenoid valve supplies oil in a stable reset state; in case of an accident, it receives a signal and quickly switches the oil circuit, supporting synchronous control of the hydraulically controlled cartridge valve 1 and the hydraulically controlled check valve 3, thus improving control accuracy.

[0039] According to a preferred embodiment of the present invention, such as Figure 2 As shown, to suppress the pressure surge caused by the instantaneous action of solenoid valve 2, a throttling orifice can be installed in the oil circuit of the control chamber of the hydraulic cartridge valve 1. This controls the pressure change process, preventing system shock and valve core vibration. Consequently, when solenoid valve 2 switches or resets, the throttling orifice limits the flow rate of oil entering the control chamber, achieving a flexible response, reducing hydraulic shock, and improving system stability and component lifespan.

[0040] According to a preferred embodiment of the present invention, such as Figure 2As shown, the overall structure of the hydraulic control system 100 is connected to the emergency pressure regulating valve via a flange face and rigidly fixed with bolts, ensuring reliable connection sealing and minimal vibration transmission, which helps maintain system consistency and long-term stability. This method allows for quick connection via bolts and flanges during installation; during on-site commissioning, only the oil source and electrical signals need to be connected to achieve precise control, greatly improving maintenance efficiency and overall equipment integration.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A hydraulic control system for an emergency pressure regulating valve device, characterized in that, The system (100) includes: a hydraulically controlled cartridge valve (1), a solenoid valve (2) connected to the oil inlet pipe (40), and a hydraulically controlled check valve (3). in: The hydraulic cartridge valve (1) is configured to be connected to the solenoid valve (2) and the pressure regulating valve equipment control oil source (20) in a selective manner, and to be in the closed state when the unit equipment connected to the emergency pressure regulating valve equipment (10) is running normally; The hydraulic check valve (3) is configured to be connected to the drain pipe (30) and the solenoid valve (2) respectively, so that when the solenoid valve (2) returns to the state, the solenoid valve (2) and the hydraulic check valve (3) are connected to each other, so that the drain of the hydraulic check valve (3) is in a closed state. The solenoid valve (2) is configured to receive external electrical signals so that the solenoid valve (2) can be selectively connected to the hydraulic cartridge valve (1) and the hydraulic check valve (3) under external signals.

2. The hydraulic control system for an emergency pressure distribution valve device according to claim 1, characterized in that, The control chamber of the hydraulic cartridge valve (1) is connected to the solenoid valve (2) so that the pressure oil from the inlet pipe (40) can move into the control chamber after passing through the solenoid valve (2).

3. The hydraulic control system for an emergency pressure distribution valve device according to claim 2, characterized in that, The other end of the hydraulic cartridge valve (1) is connected to the control oil source (20) of the pressure regulating valve device, so that the control oil source (20) from the pressure regulating valve device moves outward after passing through the hydraulic cartridge valve (1).

4. The hydraulic control system for an emergency pressure distribution valve device according to claim 3, characterized in that, The hydraulic control check valve (3) is configured as an integrated block structure, and the oil circuit of the integrated block is connected to the oil drain pipe and the solenoid valve (2) respectively.

5. The hydraulic control system for an emergency pressure distribution valve device according to claim 4, characterized in that, The integrated block structure is equipped with a channel network to achieve efficient distribution of control oil, discharge oil and feedback oil.

6. The hydraulic control system for an emergency pressure distribution valve device according to claim 5, characterized in that, When the hydraulic cartridge valve (1) and the hydraulic check valve (3) are connected to each other and the solenoid valve (2) is in the reset state, the pressure oil from the solenoid valve (2) moves into the hydraulic cartridge valve (1) and the hydraulic check valve (3) respectively, and the hydraulic cartridge valve (1) is in the closed state, and the hydraulic check valve (3) is in the closed state, so that the pressure oil moves into the emergency pressure regulating valve device (10), and then the emergency pressure regulating valve device (10) is in the reset state.

7. The hydraulic control system for an emergency pressure distribution valve device according to claim 6, characterized in that, When the solenoid valve (2) is activated, the oil circuit of the solenoid valve (2) is switched, and the oil discharge circuit of the hydraulic control check valve (3) is connected, and the emergency pressure distribution valve device (10) returns to the discharge chamber.

8. The hydraulic control system for an emergency pressure distribution valve device according to claim 7, characterized in that, The solenoid valve (2) is a two-position two-way or two-position three-way valve, and has two stable states: action and reset.

9. The hydraulic control system for an emergency pressure regulating valve device according to claim 1, characterized in that, The hydraulic cartridge valve (1) has a throttling orifice in its control chamber to reduce hydraulic shock and improve control stability.

10. The hydraulic control system for an emergency pressure distribution valve device according to claim 1, characterized in that, The system (100) is rigidly connected to the emergency pressure regulating valve device (10) through flange face and bolts to ensure liquid circuit sealing and structural stability.

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