Speed regulator control system with interlocking function

Abstract

The utility model relates to the field of industrial automation control, in particular to a speed regulator control system with an interlocking function, which comprises a shutdown interlocking valve, the shutdown interlocking valve is communicated with an emergency shutdown valve through an oil way pipeline, and an oil way between the shutdown interlocking valve and the emergency shutdown valve is communicated with a second pressure switch. A fourth pressure switch used for controlling the shutdown interlocking valve to be opened or closed is arranged on the shutdown interlocking valve, the shutdown interlocking valve is communicated with a control pressure oil way, the control pressure oil way is communicated with a related digital valve through an oil way pipeline, and the emergency shutdown valve is communicated with a hydraulic control reversing valve through an oil way pipeline. By introducing automatic components such as the interlocking valve, the pressure switch and the pressure transmitter, linkage and interlocking functions of the water turbine multistage system assembly and the speed regulating system can be achieved, and the safety level and the risk resistance of a water turbine control system are improved.

Description

Technical Field

[0001] The utility model relates to the field of industrial automation control, in particular to a speed regulator control system with an interlocking function. Background Art

[0002] The turbine speed governor is the core component of turbine motion control. It has the functions of realizing turbine guide and blade opening, closing and opening adjustment to match the power generation demand of the power grid.

[0003] The primary prerequisite for the operation of a hydropower station turbine is the safety of the unit equipment and personnel. While controlling the operation of the turbine to generate electricity, the governor system needs to work with other components and systems of the unit to provide redundant safety monitoring and control to ensure the personal safety of operation and maintenance personnel, thereby achieving the safe production goals of the hydropower station.

[0004] A speed regulator system control scheme with a multi-level safety redundancy design, comprehensive operating rules and regulations, and strong personnel execution and safety awareness are the three magic weapons for safe production in hydropower stations. Among them, a speed regulation system control scheme that takes the overall situation into consideration can largely avoid operational risks caused by personal operating habits and negligence. Formulating a practical and feasible multi-level safety redundancy speed regulation system control scheme is an important goal of hydropower station construction and development. Utility Model Content

[0005] The purpose of the present utility model is to provide a speed governor control system with an interlocking function to solve the problems raised in the above background technology.

[0006] The technical solution of the utility model is: a speed governor control system with an interlocking function, comprising a shutdown interlock valve, wherein the shutdown interlock valve is connected to an emergency stop valve through an oil pipeline, the oil pipeline between the shutdown interlock valve and the emergency stop valve is connected to a second pressure switch, the shutdown interlock valve is provided with a fourth pressure switch for controlling the opening or closing of the shutdown interlock valve, the shutdown interlock valve is connected to a control pressure oil pipeline, the control pressure oil pipeline is connected to relevant digital valves through an oil pipeline, the emergency stop valve is connected to a hydraulically controlled reversing valve through an oil pipeline, the closing digital valve is connected to a main pressure distributing valve through an oil pipeline, and the main pressure distributing valve is connected to an opening digital valve through an oil pipeline.

[0007] Preferably, the shutdown interlock valve has two functional states and three working oil ports, the emergency shutdown valve has two functional states and three working oil ports, the hydraulically controlled reversing valve has two functional states and four working oil ports, and the main pressure regulating valve has three functional states and four working oil ports.

[0008] Preferably, the three working oil ports of the shutdown interlock valve are P1, T1 and A1 respectively; the three working oil ports of the emergency shutdown valve are P2, T2 and A2 respectively; the four working oil ports of the hydraulically controlled reversing valve are P3, T3, A3 and B3 respectively; and the four working oil ports of the main pressure regulating valve are P6, T6, A6 and B6 respectively.

[0009] Preferably, the shutdown interlock valve, emergency shutdown valve, digital valve and pressure switch are all powered by power supply, and the hydraulically controlled reversing valve and main pressure regulating valve are all powered by high-pressure hydraulic oil.

[0010] Preferably, the P6 port of the main pressure regulating valve is connected to the main pressure oil circuit, the T port of the main pressure regulating valve is connected to the main return oil circuit, the A6 port of the main pressure regulating valve is connected to the relay closing chamber, and the B6 port of the main pressure regulating valve is connected to the relay opening chamber.

[0011] Preferably, the emergency stop valve and the pressure switch can be replaced by a pressure transmitter or multiple sets of pressure transmitters in a redundant configuration.

[0012] Preferably, one end of the oil pipeline between the shutdown interlock valve and the emergency stop valve is fixedly connected to the A1 port of the shutdown interlock valve, and the other end of the oil pipeline between the shutdown interlock valve and the emergency stop valve is fixedly connected to the P2 port of the emergency stop valve.

[0013] Preferably, the B port of the hydraulically controlled reversing valve is connected to the T port of the closing digital valve through an oil pipeline, and the oil pipeline between the closing digital valve and the hydraulically controlled reversing valve is connected to a pressure switch 1.

[0014] The present invention provides a speed governor control system with an interlocking function through improvement. Compared with the prior art, it has the following improvements and advantages:

[0015] Firstly, the utility model introduces a shutdown interlock valve to realize the locking function of the turbine front control equipment on the speed governor, thereby enhancing the control logic of the turbine and reducing the risk of equipment damage caused by personnel process confusion;

[0016] Second: In this utility model, the introduction of automation components such as interlock valves, pressure switches and pressure transmitters can realize the linkage and interlocking functions of the turbine multi-stage system components and the speed control system, thereby improving the safety level and risk resistance of the turbine control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of a speed governor control system with an interlocking function of the present utility model;

[0019] Description of reference numerals:

[0020] 1. Shutdown interlock valve; 2. Pressure switch 2; 3. Emergency shutdown valve; 4. Pressure switch 4; 5. Close digital valve; 6. Hydraulic-controlled reversing valve; 7. Pressure switch 1; 8. Open digital valve; 9. Main pressure distribution valve. DETAILED DESCRIPTION

[0021] The following is a detailed description of the present invention, clearly and completely describing the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The utility model provides a speed regulator control system with an interlocking function through improvement. The technical solution of the utility model is:

[0023] like Figure 1 As shown, a speed governor control system with an interlocking function includes a shutdown interlock valve 1, which is connected to an emergency stop valve 3 through an oil pipeline. The oil pipeline between the shutdown interlock valve 1 and the emergency stop valve 3 is connected to a pressure switch 2. The shutdown interlock valve 1 is provided with a pressure switch 4 for controlling the opening or closing of the shutdown interlock valve 1. The shutdown interlock valve 1 is connected to a control pressure oil circuit, which is connected to a related digital valve 5 through an oil pipeline. The emergency stop valve 3 is connected to a hydraulically controlled reversing valve 6 through an oil pipeline. The closing digital valve 5 is connected to a main pressure regulating valve 9 through an oil pipeline. The main pressure regulating valve 9 is connected to an opening digital valve 8 through an oil pipeline.

[0024] Furthermore, the shutdown interlock valve 1 has two functional states and three working oil ports, the emergency shutdown valve 3 has two functional states and three working oil ports, the hydraulically controlled reversing valve 6 has two functional states and four working oil ports, and the main pressure regulating valve 9 has three functional states and four working oil ports. The two functional states enable switching between operating modes under different control logics. For example, different oil circuit connection methods can be implemented in different scenarios such as normal operation and fault shutdown.

[0025] Furthermore, the three working oil ports of the shutdown interlock valve 1 are P1, T1, and A1, respectively; the three working oil ports of the emergency shutdown valve 3 are P2, T2, and A2, respectively; the four working oil ports of the hydraulically controlled reversing valve 6 are P3, T3, A3, and B3, respectively; and the four working oil ports of the main pressure regulating valve 9 are P6, T6, A6, and B6.

[0026] Furthermore, the shutdown interlock valve 1, the emergency shutdown valve 3, the closing digital valve 5 and the pressure switch 7 are all powered by power for functional switching, and the hydraulically controlled directional valve 6 and the main pressure regulating valve 9 are all powered by high-pressure hydraulic oil for functional switching. The hydraulic oil itself has a certain lubricity, and in the process of driving the hydraulically controlled directional valve 6 and the main pressure regulating valve 9 for functional switching, it can lubricate the valve core and other moving parts.

[0027] Furthermore, port P6 of the main pressure-regulating valve 9 is connected to the main pressure oil circuit, port T6 of the main pressure-regulating valve 9 is connected to the main return oil circuit, port A6 of the main pressure-regulating valve 9 is connected to the servomotor closing chamber, and port B6 of the main pressure-regulating valve 9 is connected to the servomotor opening chamber. By connecting ports P6, T6, A6, and B6 of the main pressure-regulating valve 9 with different oil circuits and servomotor chambers, the movement of the servomotor can be precisely controlled. When the valve core of the main pressure-regulating valve 9 moves to different positions, changing the connection relationship between port P6 and ports A6, B6, and T6, the flow rate and direction of the hydraulic oil entering the servomotor opening and closing chambers can be controlled.

[0028] Furthermore, the emergency stop valve 3 and the pressure switch 7 can be replaced by a pressure transmitter or multiple sets of pressure transmitters in a redundant configuration. The pressure transmitter can provide more accurate pressure measurement. Compared with the pressure switch 7, the pressure transmitter can output a continuous pressure signal instead of a simple switch value, which enables the system to understand the pressure changes more accurately. For some hydraulic systems that are more sensitive to pressure changes, such as high-precision turbine speed control systems, it can better perform precise control based on the actual pressure value.

[0029] Furthermore, one end of the oil pipeline between shutdown interlock valve 1 and emergency stop valve 3 is fixedly connected to port A of shutdown interlock valve 1, and the other end of the oil pipeline between shutdown interlock valve 1 and emergency stop valve 3 is fixedly connected to port P2 of emergency stop valve 3. When an emergency shutdown is required, shutdown interlock valve 1 and emergency stop valve 3 can work together. This connection method allows hydraulic oil to be quickly delivered to port P2 of emergency stop valve 3 after shutdown interlock valve 1 is activated. Emergency stop valve 3 can use this hydraulic oil to quickly switch its functional state, thereby cutting off the system's power transmission or redirecting the hydraulic oil flow, ensuring that the equipment can be stopped in the shortest possible time, effectively preventing equipment damage or further escalation of the accident.

[0030] Furthermore, the B3 port of the hydraulically controlled reversing valve 6 is connected to the T3 port of the closing digital valve 5 through an oil pipeline. The oil pipeline between the closing digital valve 5 and the hydraulically controlled reversing valve 6 is connected with a pressure switch 7. The pressure switch 7 is set on the connecting oil pipeline between the closing digital valve 5 and the hydraulically controlled reversing valve 6, and can monitor the pressure of this section of the oil pipeline in real time. When the pressure changes abnormally, the pressure switch 7 can send a signal in time.

[0031] The working process of the speed regulator control scheme with interlocking function provided by the utility model is as follows:

[0032] Normal startup of the speed governor: The shutdown interlock valve 1 and the emergency shutdown valve 3 are both in the reset state. The control chamber CA of the hydraulically controlled reversing valve 6 is connected to the control pressure oil circuit. The control pressure oil from port P3 of the hydraulically controlled reversing valve 6 is introduced into port A3 of the hydraulically controlled reversing valve 6. Port A of the hydraulically controlled reversing valve 6 is connected to port P4 of the open digital valve 8. The control return oil from port T3 of the hydraulically controlled reversing valve 6 is connected to port T5 of the close digital valve 5 through port B3 of the hydraulically controlled reversing valve 6. The solenoid coil of the open digital valve 8 is energized, and the solenoid coil of the close digital valve 5 is de-energized. The control pressure oil circuit enters the control chamber CB of the main pressure regulating valve 9 through port A4 of the open digital valve 8. The control return oil circuit enters the control chamber CA of the main pressure regulating valve 9 through port A5 of the close digital valve 5. The function of the main pressure regulating valve 9 is switched. The main pressure oil circuit is connected to the servomotor open chamber through port B6 of the main pressure regulating valve 9. The main return oil circuit is connected to the servomotor close chamber through port A6 of the main pressure regulating valve 9. The servomotor is started.

[0033] Normal shutdown of the speed governor: The shutdown interlock valve 1 and the emergency shutdown valve 3 are both in the reset state. The control pressure oil is connected to the control chamber CA of the hydraulically controlled reversing valve 6. The control pressure oil from port P3 of the hydraulically controlled reversing valve 6 is introduced into port A3 of the hydraulically controlled reversing valve 6. Port A3 of the hydraulically controlled reversing valve 6 is connected to port P4 of the open digital valve 8. The control return oil from port T3 of the hydraulically controlled reversing valve 6 is connected to port T5 of the close digital valve 5 through port B3 of the hydraulically controlled reversing valve 6. The solenoid coil of the open digital valve 8 is de-energized, while the solenoid coil of the close digital valve 5 is energized. The control pressure oil enters the control chamber CA of the main pressure regulating valve 9 through port A5 of the close digital valve 5. The control return oil enters the control chamber CB of the main pressure regulating valve 9 through port A4 of the open digital valve 8. The function of the main pressure regulating valve 9 is switched. The main pressure oil line is connected to the relay closing chamber through port A6 of the main pressure regulating valve 9, and the main return oil line is connected to the relay opening chamber through port B6 of the main pressure regulating valve 9. The servomotor is shut down.

[0034] Governor emergency shutdown: shutdown interlock valve 1 is in reset state, emergency shutdown valve 1 is in input state, open digital valve 8 and close digital valve 5 are both in power-off state, control chamber CA of hydraulically controlled directional control valve 6 is connected to control oil return line, function of hydraulically controlled directional control valve 6 is switched, control pressure oil from P3 port of hydraulically controlled directional control valve 6 is introduced into B3 port of hydraulically controlled directional control valve 6, B3 port of hydraulically controlled directional control valve 6 is connected to T5 port of close digital valve 5, control pressure oil line is connected to control chamber CA port of main pressure distributing valve 9 through A5 port of close digital valve 5, control oil return line is connected to control chamber CB port of main pressure distributing valve 9 through A4 port of open digital valve 8, function of main pressure distributing valve 9 is switched, main pressure oil line is connected to servomotor close chamber through A6 port of main pressure distributing valve 9, main return oil is connected to servomotor open chamber through B6 port of main pressure distributing valve 9, and servomotor is shut down. At this time, neither open nor close digital valve 5 can actuate the servomotor.

[0035] Governor shutdown interlock: emergency stop valve 3 is in reset state, shutdown interlock valve 1 is in input state, open digital valve 8 and close digital valve 5 are both in power-off state, control chamber CA of hydraulic control directional valve 6 is connected to control oil return line, the function of hydraulic control directional valve 6 is switched, hydraulic control directional valve 6 obtains control pressure oil from P3 port and introduces it into B3 port of hydraulic control directional valve 6, B33 port of hydraulic control directional valve 6 is connected with T5 port of close digital valve 5, and the control pressure oil line is connected through close digital valve 5. The A5 port of the digital valve 5 is connected to the control chamber CA port of the main pressure-regulating valve 9, and the control return oil circuit is connected to the control chamber CB port of the main pressure-regulating valve 9 through the A4 port of the open digital valve 8. The function of the main pressure-regulating valve 9 is switched, and the main pressure oil circuit is connected to the relay closing chamber through the A6 port of the main pressure-regulating valve 9, and the main return oil circuit is connected to the relay opening chamber through the B6 port of the main pressure-regulating valve 9. The relay is shut down. At this time, the opening and closing digital valves 5 cannot actuate the relay, and the relay is shut down and locked.

[0036] The above description is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A governor control system with an interlocking function, comprising a shutdown interlocking valve (1), characterized in that: The shutdown interlock valve (1) is connected to the emergency shutdown valve (3) through an oil pipeline, the oil pipeline between the shutdown interlock valve (1) and the emergency shutdown valve (3) is connected to a second pressure switch (2), the shutdown interlock valve (1) is provided with a fourth pressure switch (4) for controlling the opening or closing of the shutdown interlock valve (1), the shutdown interlock valve (1) is connected to a control pressure oil pipeline, the control pressure oil pipeline is connected to a related digital valve (5) through an oil pipeline, the emergency shutdown valve (3) is connected to a hydraulically controlled reversing valve (6) through an oil pipeline, the closing digital valve (5) is connected to a main pressure regulating valve (9) through an oil pipeline, and the main pressure regulating valve (9) is connected to an opening digital valve (8) through an oil pipeline.

2. A speed governor control system with an interlocking function according to claim 1, characterized in that: The shutdown interlock valve (1) has two functional states and three working oil ports, the emergency shutdown valve (3) has two functional states and three working oil ports, the hydraulically controlled reversing valve (6) has two functional states and four working oil ports, and the main pressure regulating valve (9) has three functional states and four working oil ports.

3. The speed governor control system with interlocking function according to claim 1, characterized in that: The three working oil ports of the shutdown interlock valve (1) are respectively P1 port, T1 port, and A1 port; the three working oil ports of the emergency shutdown valve (3) are respectively P2 port, T2 port, and A2 port; the four working oil ports of the hydraulically controlled reversing valve (6) are respectively P3 port, T3 port, A3 port, and B3 port; the four working oil ports of the main pressure regulating valve (9) are respectively P6 port, T6 port, A6 port, and B6 port.

4. A speed governor control system with an interlocking function according to claim 1, characterized in that: The shutdown interlock valve (1), emergency shutdown valve (3), digital valve (5) and pressure switch 1 (7) are all powered by power supply for switching functions, and the hydraulically controlled reversing valve (6) and main pressure regulating valve (9) are all powered by high-pressure hydraulic oil for switching functions.

5. The speed governor control system with interlocking function according to claim 1, characterized in that: The P6 port of the main pressure regulating valve (9) is connected to the main pressure oil circuit, the T6 port of the main pressure regulating valve (9) is connected to the main return oil circuit, the A6 port of the main pressure regulating valve (9) is connected to the servomotor closing chamber, and the B6 port of the main pressure regulating valve (9) is connected to the servomotor opening chamber.

6. The speed governor control system with interlocking function according to claim 1, characterized in that: The emergency stop valve (3) and the pressure switch (7) can be replaced by a pressure transmitter or multiple sets of pressure transmitters in a redundant configuration.

7. The speed governor control system with interlocking function according to claim 1, characterized in that: One end of the oil pipeline between the shutdown interlock valve (1) and the emergency stop valve (3) is fixedly connected to the A1 port of the shutdown interlock valve (1), and the other end of the oil pipeline between the shutdown interlock valve (1) and the emergency stop valve (3) is fixedly connected to the P2 port of the emergency stop valve (3).

8. The speed governor control system with interlocking function according to claim 1, characterized in that: The B3 port of the hydraulically controlled reversing valve (6) is connected to the T port of the closing digital valve (5) through an oil pipeline, and the oil pipeline between the closing digital valve (5) and the hydraulically controlled reversing valve (6) is connected to a pressure switch 1 (7).

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