Four-speed hydraulic control executing mechanism for circulating water pump outlet butterfly valve

Abstract

An oil tank is connected with an electric oil pump and an energy accumulator, the output end of the electric oil pump is connected with the input end of a zero-leakage electromagnetic valve, and the output end of the zero-leakage electromagnetic valve is connected with oil inlets of a high-speed electromagnetic valve and a low-speed electromagnetic valve. Two working ports of the high-speed electromagnetic valve are connected with two input ports of the first stacked type double-one-way throttle valve respectively, and two working ports of the low-speed electromagnetic valve are connected with two input ports of the second stacked type double-one-way throttle valve respectively. One output port of the first stacked type double one-way throttle valve and one output port of the second stacked type double one-way throttle valve are connected with the valve closing end of the oil cylinder, and the other output port of the first stacked type double one-way throttle valve and the other output port of the second stacked type double one-way throttle valve are connected with the valve opening end of the oil cylinder. And the zero-leakage electromagnetic valve, the high-speed electromagnetic valve, the low-speed electromagnetic valve and the electric oil pump are electrically connected with the control cabinet.

Description

Technical Field

[0001] The utility model relates to the field of actuators, in particular to a four-speed hydraulically controlled actuator for an outlet butterfly valve of a circulating water pump. Background Art

[0002] For thermal power, nuclear power, biomass power generation and other fields that use steam turbines to generate electricity, water is converted into high-pressure steam to drive the steam turbine to rotate and generate electricity. A large amount of water resources are needed in the process. A circulating water pipeline with a diameter of about DN2000 to DN3000 is set inside the factory. A circulating water pump is set at the front end of the pipeline for transportation. A hydraulically controlled butterfly valve is set at the outlet of the pump. The hydraulic actuator driven by the butterfly valve has the following requirements: the valve opening process is divided into two sections of control, 0 to 15° fast opening, 15 to 90° uniform opening; the valve closing process is also divided into two sections of control, 90 to 15° fast closing, 15 to 0° slow closing. Its purpose is to achieve on-site water hammer protection to prevent damage to pipelines or water pumps. In particular, when the main pump stops working after power failure on site, the outlet butterfly valve needs to be closed quickly at a large angle immediately to prevent water backflow from damaging the main pump. At the same time, it cannot be completely closed immediately, otherwise a large-energy positive water hammer effect will occur, which will damage the rear-end pipeline. Since the diameter of the pipe used by the butterfly valve is large, the positive water hammer effect is more obvious. Therefore, the two-stage control of the actuator in the valve opening and protection is the key to realizing the protection of the water pump and the shutoff. In order to deal with the positive water hammer effect of the circulating water pump outlet butterfly valve, a hydraulic single-acting heavy hammer structure is currently used. The closing process relies on the gravity potential energy of the heavy hammer to provide power. The heavy hammer is large in size and heavy in weight. After opening, it relies on hydraulic pressure to balance gravity, which has a high risk of accidents. At the same time, the opening process needs to offset gravity first, which consumes a lot of energy.

[0003] The patent application with the publication number CN114278742A discloses an integrated energy storage type hydraulic controlled slow closing butterfly valve and a method of using the same. The mechanical, electrical and hydraulic systems of the control valve body are integrated into a whole. A flow control valve and a first solenoid valve are arranged between the accumulator and the oil pump motor, a second solenoid valve and a pipeline stop valve are arranged between the oil pump motor and the oil cylinder, and an overflow valve is arranged on the oil pipeline between the accumulator and the oil cylinder; and a fast closing regulating valve, a slow closing regulating valve and a fast and slow angle regulating valve are arranged at one end of the oil cylinder, and the output end of the other end is connected to the rocker arm, and the rocker arm is connected to the valve plate through an actuator. In this scheme, the oil pump motor and the oil cylinder are only controlled by the second solenoid valve, and the fast closing regulating valve, the slow closing regulating valve and the fast and slow angle regulating valve are only arranged at one end of the oil cylinder, and the oil circuits of the two inlets and outlets of the oil cylinder cannot be adjusted. Although slow closing can be achieved, it can only be used on butterfly valves with smaller control pipe diameters, and is not applicable to butterfly valves with larger pipe diameters, and has low reliability. How to solve this problem? A four-speed hydraulically controlled actuator is needed for the circulating water pump outlet butterfly valve. Summary of the invention

[0004] The purpose of the utility model is to address the deficiencies in the prior art and provide a four-speed hydraulically controlled actuator for a circulating water pump outlet butterfly valve, thereby solving the problem of the circulating water pump outlet butterfly valve being damaged by the positive water hammer effect and the problem of low reliability of hydraulic control.

[0005] The purpose of the utility model is to adopt the following scheme to achieve: a four-speed hydraulic control actuator for a circulating water pump outlet butterfly valve, including an electric oil pump, an oil cylinder, an accumulator, an oil tank, a control cabinet, and a control valve group, wherein the control valve group includes a zero-leakage solenoid valve, a fast solenoid valve, a slow solenoid valve, a first stacked double-check throttle valve, and a second stacked double-check throttle valve, wherein the oil tank is connected to the electric oil pump, and the output ends of the accumulator and the electric oil pump are connected to the input end of the zero-leakage solenoid valve, and the output ends of the zero-leakage solenoid valve are respectively connected to the oil inlets of the fast solenoid valve and the slow solenoid valve. The two working ports of the fast solenoid valve are respectively connected to the two input ports of the first superimposed double one-way throttle valve, and the two working ports of the slow solenoid valve are respectively connected to the two input ports of the second superimposed double one-way throttle valve. One output port of the first superimposed double one-way throttle valve and the second superimposed double one-way throttle valve is connected to the valve closing end of the oil cylinder, and the other output port is connected to the valve opening end of the oil cylinder. The oil return ports of the fast solenoid valve and the slow solenoid valve are connected to the oil tank through pipelines, and the zero-leakage solenoid valve, the fast solenoid valve, the slow solenoid valve, and the electric oil pump are electrically connected to the control cabinet.

[0006] Preferably, a manual operating mechanism is arranged between the oil tank and the oil cylinder, and the manual operating mechanism includes a two-way hydraulic lock, a manual reversing valve, and a manual pump. The oil tank is connected to the two-way hydraulic lock through the manual pump via the manual reversing valve. The two outlets of the two-way hydraulic lock are respectively connected to the valve opening end and the valve closing end of the oil cylinder. The manual reversing valve is a three-position four-way manual reversing valve.

[0007] Preferably, a first superimposed bidirectional hydraulic lock is arranged between the working port of the fast solenoid valve and the first superimposed double one-way throttle valve, and a second superimposed bidirectional hydraulic lock is arranged between the slow solenoid valve and the second superimposed double one-way throttle valve.

[0008] Preferably, a pressure relief valve is provided between the input end and the output end of the electric oil pump, and a pressure gauge is provided at the output end of the electric oil pump.

[0009] Preferably, the fast solenoid valve and the slow solenoid valve are both three-position four-way solenoid valves.

[0010] Preferably, a pressure sensor is provided between the electric oil pump and the zero-leakage solenoid valve.

[0011] Preferably, the electric oil pump, control valve group, control cabinet, accumulator and oil tank are all installed on a floor bracket, and a valve position sensor is provided on the oil cylinder.

[0012] Preferably, the control valve group includes a valve block, and the zero-leakage solenoid valve, fast solenoid valve, slow solenoid valve, first stacked double one-way throttle valve, second stacked double one-way throttle valve, first stacked two-way hydraulic lock, and second stacked two-way hydraulic lock are all installed on the valve block.

[0013] Preferably, a wiring terminal and a drain outlet sleeve are provided on the valve block of the control valve group, and the wiring terminal is used to connect the valves in the control valve group. The connecting wires of the zero-leakage solenoid valve, the fast solenoid valve and the slow solenoid valve extend out of the drain outlet sleeve and are connected to the control cabinet.

[0014] Preferably, a dust cover is provided on the control valve group.

[0015] By adopting the above scheme, a zero-leakage solenoid valve is set between the oil tank and the oil cylinder as the main valve, and the outlet end of the zero-leakage solenoid valve is connected to the valve opening end and the valve closing end of the oil cylinder through a fast solenoid valve, a slow solenoid valve and a superimposed double one-way throttle valve respectively. By independently conducting the two working ports of the fast solenoid valve and the slow solenoid valve, the pressure is supplemented by the accumulator to realize the four-speed control of the butterfly valve. The hydraulic control execution structure is simple and the reliability is high. The oil cylinder and the power unit are set separately to reduce the gravity load of the valve pipeline and facilitate maintenance.

[0016] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the principle diagram of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the utility model;

[0019] Figure 3 It is a structural schematic diagram of another viewing angle of the utility model;

[0020] Figure 4 It is a structural schematic diagram of the control valve group of the utility model. DETAILED DESCRIPTION

[0021] See also Figures 1 to 4A four-speed hydraulically controlled actuator for a circulating water pump outlet butterfly valve comprises an electric oil pump 3, an oil cylinder 7, an accumulator 9, an oil tank 10, a control cabinet 4, and a control valve group 5. The electric oil pump 3 is driven by a motor 2. The control valve group 5 comprises a zero leakage solenoid valve 26, a fast solenoid valve 17, a slow solenoid valve 16, a first stacked double one-way throttle valve 18, and a second stacked double one-way throttle valve 19. The fast solenoid valve 17 and the slow solenoid valve 16 are both three-position four-way solenoid valves. The diameter of the throttle valve in the first stacked double one-way throttle valve 18 is greater than the diameter of the throttle valve in the second stacked double one-way throttle valve 19. The oil tank 10 is connected to the electric oil pump 3, the output ends of the accumulator 9 and the electric oil pump 3 are connected to the input end of the zero leakage solenoid valve 26, a pressure sensor 27 is arranged between the electric oil pump 3 and the zero leakage solenoid valve 26, the output end of the zero leakage solenoid valve 26 is respectively connected to the oil inlet of the fast solenoid valve 17 and the slow solenoid valve 16, the two working ports of the fast solenoid valve 17 are respectively connected to the two input ports of the first superimposed double one-way throttle valve 18, the two working ports of the slow solenoid valve 16 are respectively connected to the two input ports of the second superimposed double one-way throttle valve 19, one output port of the first superimposed double one-way throttle valve 18 and the second superimposed double one-way throttle valve 19 is connected to the valve closing end of the oil cylinder 7, and the other output port is connected to the valve opening end of the oil cylinder 7. A first superimposed two-way hydraulic lock 33 is arranged between the working port of the fast solenoid valve 17 and the first superimposed double one-way throttle valve 18, and a second superimposed two-way hydraulic lock 34 is arranged between the slow solenoid valve 16 and the second superimposed double one-way throttle valve 19. A pressure relief valve 25 is provided between the input end and the output end of the electric oil pump 3, and a pressure gauge 24 is provided at the output end of the electric oil pump 3. The oil return ports of the fast solenoid valve 17 and the slow solenoid valve 16 are connected to the oil tank 10 through pipelines, and the zero leakage solenoid valve 26, the fast solenoid valve 17, the slow solenoid valve 16, the electric oil pump 3 and the control cabinet 4 are electrically connected.

[0022] The zero leakage solenoid valve 26 is used as a main switch valve to prevent the fast solenoid valve 17 and the slow solenoid valve 16 from releasing a large pressure, thereby reducing the pressure holding time of the accumulator.

[0023] In this embodiment, a manual operating mechanism is arranged between the oil tank 10 and the oil cylinder 7, and the manual operating mechanism comprises a two-way hydraulic lock 31, a manual reversing valve 32, and a manual pump 20. The oil tank 10 is connected to the two-way hydraulic lock 31 through the manual reversing valve 32 via the manual pump 20. The two outlets of the two-way hydraulic lock 31 are respectively connected to the valve opening end and the valve closing end of the oil cylinder 7. The manual reversing valve 32 is a three-position four-way manual reversing valve. The manual operating mechanism can manually operate the opening and closing of the butterfly valve when the electrical control valve fails or in an emergency, thereby improving the reliability of the actuator.

[0024] In this embodiment, the motor 2, the electric oil pump 3, the control valve group 5, the control cabinet 4, the accumulator 9, and the oil tank 10 are all installed on a floor bracket 1, and the oil cylinder 7 is provided with a valve position sensor 8. The control valve group 5 includes a valve block, and the zero leakage solenoid valve 26, the fast solenoid valve 17, the slow solenoid valve 16, the first superimposed double one-way throttle valve 18, the second superimposed double one-way throttle valve 19, the first superimposed two-way hydraulic lock 33, and the second superimposed two-way hydraulic lock 34 are all installed on the valve block. The valve block of the control valve group 5 is provided with a wiring terminal 28, a drain outlet sleeve 22, and a drain outlet sleeve 23. The wiring terminal 28 is used to connect the valve in the control valve group 5, which is convenient for maintenance. The connection lines of the zero leakage solenoid valve 26, the fast solenoid valve 17, and the slow solenoid valve 16 extend out of the drain outlet sleeve 22 and the drain outlet sleeve 23 and are connected to the control cabinet 4. The control valve group 5 is provided with a dust cover 6. The actuator is divided into a cylinder part and a power unit part, and the motor 2, electric oil pump 3, control valve group 5, control cabinet 4, accumulator 9, and oil tank 10 of the power unit part are installed through the bracket 1, which greatly reduces the gravity load of the valve pipeline, improves earthquake resistance, and facilitates maintenance.

[0025] like Figure 1 As shown, the fast solenoid valve 17 is provided with coil 1DT and coil 2DT, and the slow solenoid valve 16 is provided with coil 3DT and coil 4DT, and two working ports of the fast solenoid valve and the slow solenoid valve are independently controlled to be respectively turned on, thereby realizing the switching of four-speed control.

[0026] When the butterfly valve is opened by using the present embodiment, the coil 1DT of the fast electromagnetic valve 17 is firstly attracted, the fast electromagnetic valve 17 is connected to the working port of the valve opening end of the oil cylinder 7, the oil enters the valve opening end of the oil cylinder, and the valve is quickly opened until the valve position sensor 8 detects that the valve is opened to 15°, then the coil 3DT of the slow electromagnetic valve 16 is controlled to be attracted, the slow electromagnetic valve 16 is connected to the working port of the valve opening end of the oil cylinder 7, the oil enters the valve opening end of the oil cylinder, and the valve is opened at a uniform speed until the valve position sensor 8 detects that the valve is opened to 90°, and the butterfly valve is completed. opening; when closing the butterfly valve, first the coil 2DT of the fast solenoid valve 17 is attracted, the fast solenoid valve 17 is connected with the working port of the valve closing end of the oil cylinder 7, the oil enters the valve closing end of the oil cylinder, and the valve is quickly closed until the valve position sensor 8 detects that the valve is closed to 15°, then the coil 4DT of the slow solenoid valve 16 is controlled to be attracted, the slow solenoid valve 16 is connected with the working port of the valve closing end of the oil cylinder 7, the oil enters the valve closing end of the oil cylinder, and the valve is slowly closed until the valve position sensor 8 detects that the valve is closed to 0°, completing the closing of the butterfly valve.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A four-speed hydraulically controlled actuator for a circulating water pump outlet butterfly valve, comprising an electric oil pump (3), an oil cylinder (7), an accumulator (9), an oil tank (10), a control cabinet (4), and a control valve group (5), characterized in that: The control valve group (5) comprises a zero-leakage solenoid valve (26), a fast solenoid valve (17), a slow solenoid valve (16), a first stacked double one-way throttle valve (18), and a second stacked double one-way throttle valve (19); the oil tank (10) is connected to the electric oil pump (3); the output ends of the accumulator (9) and the electric oil pump (3) are connected to the input end of the zero-leakage solenoid valve (26); the output end of the zero-leakage solenoid valve (26) is respectively connected to the oil inlets of the fast solenoid valve (17) and the slow solenoid valve (16); the two working ports of the fast solenoid valve (17) are respectively connected to the two working ports of the first stacked double one-way throttle valve (18); The input port is connected to the two working ports of the slow solenoid valve (16), respectively, and the two input ports of the second stacked double one-way throttle valve (19) are connected. One output port of the first stacked double one-way throttle valve (18) and the second stacked double one-way throttle valve (19) is connected to the valve closing end of the oil cylinder (7), and the other output port is connected to the valve opening end of the oil cylinder (7). The oil return ports of the fast solenoid valve (17) and the slow solenoid valve (16) are connected to the oil tank (10) through pipelines. The zero leakage solenoid valve (26), the fast solenoid valve (17), the slow solenoid valve (16), and the electric oil pump (3) are electrically connected to the control cabinet (4).

2. The four-speed hydraulically controlled actuator for the outlet butterfly valve of a circulating water pump according to claim 1 is characterized in that: A manual operating mechanism is arranged between the oil tank (10) and the oil cylinder (7), the manual operating mechanism comprising a two-way hydraulic lock (31), a manual reversing valve (32), and a manual pump (20); the oil tank (10) is connected to the two-way hydraulic lock (31) via the manual pump (20) and the manual reversing valve (32); two outlets of the two-way hydraulic lock (31) are respectively connected to a valve opening end and a valve closing end of the oil cylinder (7); the manual reversing valve (32) is a three-position four-way manual reversing valve.

3. The four-speed hydraulically controlled actuator for the outlet butterfly valve of a circulating water pump according to claim 1 is characterized in that: A first stacked bidirectional hydraulic lock (33) is provided between the working port of the fast solenoid valve (17) and the first stacked dual one-way throttle valve (18), and a second stacked bidirectional hydraulic lock (34) is provided between the slow solenoid valve (16) and the second stacked dual one-way throttle valve (19).

4. The four-speed hydraulically controlled actuator for the outlet butterfly valve of a circulating water pump according to claim 1 is characterized in that: A pressure relief valve (25) is provided between the input end and the output end of the electric oil pump (3), and a pressure gauge (24) is provided at the output end of the electric oil pump (3).

5. The four-speed hydraulically controlled actuator for the outlet butterfly valve of a circulating water pump according to claim 1 is characterized in that: The fast solenoid valve (17) and the slow solenoid valve (16) are both three-position four-way solenoid valves.

6. The four-speed hydraulically controlled actuator for the outlet butterfly valve of a circulating water pump according to claim 1 is characterized in that: A pressure sensor (27) is provided between the electric oil pump (3) and the zero-leakage solenoid valve (26).

7. The four-speed hydraulically controlled actuator for the outlet butterfly valve of a circulating water pump according to claim 1 is characterized in that: The electric oil pump (3), the control valve group (5), the control cabinet (4), the accumulator (9), and the oil tank (10) are all mounted on a floor bracket (1), and a valve position sensor (8) is arranged on the oil cylinder (7).

8. The four-speed hydraulically controlled actuator for the outlet butterfly valve of a circulating water pump according to claim 1 is characterized in that: The control valve group (5) comprises a valve block, and the zero-leakage solenoid valve (26), the fast solenoid valve (17), the slow solenoid valve (16), the first stacked double one-way throttle valve (18), the second stacked double one-way throttle valve (19), the first stacked two-way hydraulic lock (33), and the second stacked two-way hydraulic lock (34) are all mounted on the valve block.

9. The four-speed hydraulically controlled actuator for the outlet butterfly valve of a circulating water pump according to claim 1, characterized in that: A connection terminal (28) and a drain outlet sleeve (22) are provided on the valve block of the control valve group (5); the connection terminal (28) is used to connect the valves in the control valve group (5); and the connection wires of the zero leakage solenoid valve (26), the fast solenoid valve (17), and the slow solenoid valve (16) extend out of the drain outlet sleeve (22) and are connected to the control cabinet (4).

10. The four-speed hydraulically controlled actuator for the outlet butterfly valve of a circulating water pump according to claim 1, characterized in that: A dust cover (6) is provided on the control valve group (5).

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