Butterfly valve control device with mechanical overspeed protection linkage control

Abstract

This utility model relates to the technical field of butterfly valve control devices, specifically disclosing a butterfly valve control device with mechanical overspeed protection linkage control. It includes an integrated block, inside which an oil pipe is fixedly installed. The oil pipe has multiple sections. A mechanical circuit assembly is arranged on one side of the integrated block. When the mechanical overspeed protection device detects that the turbine speed exceeds a set threshold, the mechanical circuit assembly automatically closes the oil pipe at its output end. An electrical circuit assembly is arranged on one side of the integrated block. Under manual control, the electrical circuit assembly closes the oil pipe. The electrical circuit assembly and the mechanical circuit assembly are connected in series. This butterfly valve control device with mechanical overspeed protection linkage control achieves the closing of the inlet butterfly valve via hydraulic circuit linkage after the mechanical overspeed protection device is activated. The design employs redundant configuration, which not only simplifies the structure but also greatly improves the reliability of the system, ensuring that the butterfly valve can respond quickly and close reliably under critical operating conditions.

Description

Technical Field

[0001] This utility model relates to the technical field of butterfly valve control devices, specifically a butterfly valve control device with mechanical overspeed protection linkage control. Background Technology

[0002] With the widespread adoption of unmanned and minimally staffed operation modes in hydropower stations, the safety and reliability of equipment operation face increasingly stringent requirements. In the event of an abnormal shutdown, it is essential to ensure that the operating equipment can safely and reliably complete the shutdown operation. As the last line of defense for the turbine, the mechanical overspeed protection device plays a crucial role. It not only needs to precisely act on the governor to close the guide vanes, but also directly link with the inlet butterfly valve to ensure its reliable closure, thereby comprehensively protecting the safety of the unit.

[0003] However, the existing turbine inlet butterfly valves and mechanical overspeed protection devices do not have a linkage function. Once the turbine generator set runs away and the power plant's power system malfunctions, these butterfly valves without linkage function cannot close automatically. In this case, the unit will remain in a dangerous state, and the turbine may suffer serious damage due to the inability to cut off the water flow in time, or even cause more serious safety accidents, causing incalculable damage to the facilities of the entire hydropower station and the surrounding environment. Therefore, we propose a butterfly valve control device with mechanical overspeed protection linkage control. Utility Model Content

[0004] The purpose of this utility model is to provide a butterfly valve control device with mechanical overspeed protection linkage control, in order to solve the problem mentioned in the background art. However, the existing turbine inlet butterfly valves and mechanical overspeed protection devices do not have linkage function. Once the turbine generator set runs away and the power plant power system fails, these butterfly valves without linkage function cannot close automatically. In this case, the unit will continue to be in a dangerous state, and the turbine may suffer serious damage due to the inability to cut off the water flow in time, or even cause more serious safety accidents, causing incalculable damage to the facilities of the entire hydropower station and the surrounding environment.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a butterfly valve control device with mechanical overspeed protection linkage control, comprising an integrated block, an oil pipe fixedly installed inside the integrated block, the oil pipe having multiple sections, a mechanical circuit assembly disposed on one side of the integrated block, the mechanical circuit assembly automatically closing the oil pipe at its output end when the mechanical overspeed protection device detects that the turbine speed exceeds a set threshold, an electrical circuit assembly disposed on one side of the integrated block, the electrical circuit assembly closing the oil pipe under manual control, the electrical circuit assembly and the mechanical circuit assembly being connected in series.

[0006] The mechanical circuit assembly includes a hydraulic control valve, which is connected to an oil pipe. The hydraulic control valve is fixedly installed on one side of the integrated block. A pilot hydraulic control valve is fixedly installed on one side of the integrated block and is connected to an oil pipe. A shuttle valve is fixedly installed on the other side of the integrated block and is connected to an oil pipe.

[0007] A hydraulic control valve is fixedly installed on one side of the integrated block, and the oil pipe at the output end of the pilot hydraulic control valve is connected to the input end of the shuttle valve.

[0008] The oil pipe at the output end of the shuttle valve is connected to an interface on one side of the integrated block, and the oil pipe at the output end of the shuttle valve is connected to the input end of the hydraulic control valve.

[0009] The circuit circuit assembly includes a control solenoid valve, which is fixedly installed on one side of the integrated block. An emergency stop solenoid valve is fixedly installed on the top of the integrated block. The control solenoid valve is connected to the oil pipe, and the emergency stop solenoid valve is also connected to the oil pipe.

[0010] The oil pipe at the output end of the emergency stop solenoid valve is connected to the input end of the pilot hydraulic control valve, and the oil pipe at the output end of the control solenoid valve is connected to the input end of the shuttle valve.

[0011] This utility model has at least the following beneficial effects: The system achieves the linkage and closure of the inlet butterfly valve via hydraulic circuit after the mechanical overspeed protection device is activated. This design employs redundant configuration, which not only simplifies the structure but also greatly improves the reliability of the system, ensuring that the butterfly valve can respond quickly and close reliably under critical operating conditions. At the same time, after the butterfly valve is closed in linkage, the system automatically cuts off the oil pressure of the butterfly valve control valve group, thereby achieving effective hydraulic interlocking. This function can effectively prevent equipment damage that may be caused by human error and further enhance the safety during operation. In addition, the design feature of unchanged control level in structure not only ensures the stability of system operation but also simplifies the operation and maintenance process. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the planar structure of this utility model; Figure 2 This is a side view of the structural plan of this utility model; Figure 3 This is an enlarged planar structural diagram of point A of this utility model; Figure 4 This is a schematic diagram of the hydraulic system of this utility model.

[0013] In the diagram: 1. Integrated block; 2. Mechanical circuit assembly; 21. Hydraulic control valve; 22. Pilot hydraulic control valve; 23. Shuttle valve; 3. Circuit circuit assembly; 31. Control solenoid valve; 32. Emergency stop solenoid valve; 4. Oil pipe. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figures 1 to 4 This utility model provides a technical solution: a butterfly valve control device with mechanical overspeed protection linkage control, including an integrated block 1, an oil pipe 4 fixedly installed inside the integrated block 1, the oil pipe 4 having multiple sections, a mechanical circuit assembly 2 provided on one side of the integrated block 1, the mechanical circuit assembly 2 automatically closes the oil pipe 4 at its output end when the mechanical overspeed protection device detects that the turbine speed exceeds a set threshold, and an electrical circuit assembly 3 provided on one side of the integrated block 1, the electrical circuit assembly 3 closing the oil pipe 4 under manual control, the electrical circuit assembly and the mechanical circuit assembly 2 being connected in series.

[0016] Mechanical circuit assembly 2 includes a hydraulic control valve 21, which is connected to an oil pipe 4. The hydraulic control valve 21 is fixedly installed on one side of the integrated block 1. A pilot hydraulic control valve 22 is fixedly installed on one side of the integrated block 1 and is connected to the oil pipe 4. A shuttle valve 23 is fixedly installed on the other side of the integrated block 1 and is connected to the oil pipe 4. The hydraulic control valve 21 is fixedly installed on one side of the integrated block 1. The oil pipe 4 at the output end of the pilot hydraulic control valve 22 is connected to the input end of the shuttle valve 23. The oil pipe 4 at the output end of the shuttle valve 23 is connected to the input end of the integrated block 1. The interface on the surface is connected, and the oil pipe 4 at the output end of the shuttle valve 23 is connected to the input end of the hydraulic control valve 21. When the mechanical overspeed protection device is activated, it will cut off the control oil flowing into the control chamber of the pilot hydraulic control valve 22 "313HV" and connect the return oil, causing the control chamber to lose pressure and switch. The system pressure oil enters the shuttle valve 23 through this valve, pushing it to switch and shield the conventional control oil pipe 4. The pressure oil directly flows into the control chamber of the hydraulic control valve 21 "711HV" to activate it, forcing the butterfly valve to close. After the butterfly valve closes, the shuttle valve 23 remains in a state to achieve hydraulic interlocking and prevent misoperation.

[0017] The circuit loop assembly 3 includes a control solenoid valve 31, which is fixedly installed on one side of the integrated block 1. An emergency stop solenoid valve 32 is fixedly installed on the top of the integrated block 1. The control solenoid valve 31 is connected to the oil pipe 4, and the emergency stop solenoid valve 32 is also connected to the oil pipe 4. The oil pipe 4 at the output end of the emergency stop solenoid valve 32 is connected to the input end of the pilot hydraulic control valve 22, and the oil pipe 4 at the output end of the control solenoid valve 31 is connected to the input end of the shuttle valve 23. When the emergency stop solenoid valve 32 "312BV" receives an external electrical protection signal, it will switch the internal oil pipe 4 to connect the pressure oil entering the control chamber of the pilot hydraulic control valve 22 "313HV" to the return oil, causing the control chamber to lose pressure and reverse. The subsequent actions are the same as when the mechanical overspeed protection device is activated, that is, the butterfly valve is forced to close through a series of oil pipe 4 switching, and hydraulic locking is achieved by the shuttle valve 23.

[0018] Under normal operating conditions, the system pressure oil enters the control stage integrated block 1 through the main oil pipe 4 to provide power to each valve group. The mechanical overspeed protection device does not activate, and its output control oil normally flows into the emergency stop solenoid valve 32 "312BV", and then into the control chamber of the pilot hydraulic control valve 22 "313HV", so that the valve core of the pilot hydraulic control valve 22 "313HV" is in the P and A connected and T and B connected states. At this time, the control solenoid valve 31 "311BV" can receive the normal operation signal and control the input pressure of the shuttle valve 23 by switching its own oil pipe 4. The shuttle valve 23 guides the oil pipe 4 to the control chamber of the hydraulic control valve 21 "711HV", so that the valve core of the hydraulic control valve 21 "711HV" operates according to the command, thereby controlling the opening and closing of the butterfly valve. The return oil of all valve groups is collected through the oil pipe 4 inside the integrated block 1 and returned to the oil tank.

[0019] When the mechanical overspeed protection device detects that the turbine speed exceeds the set threshold and activates, the control oil output from it no longer flows into the emergency stop solenoid valve 32 "312BV". Instead, it directly connects to the return oil. Here, "return oil" means that the control oil originally used to maintain the valve core position is no longer pressurized and flows back to the oil tank through the return oil path. This causes the control chamber of the pilot hydraulic control valve 22 "313HV" to lose pressure. At this time, the valve core switches to the P-B connected and T-A connected state under the action of spring force or system pressure difference. Subsequently, the system pressure oil enters one input terminal of the shuttle valve 23 through the P→B ​​port of the pilot hydraulic control valve 22 "313HV", pushing the valve core of the shuttle valve 23 to switch. At this time, shuttle valve 23 responds first to the high-pressure oil signal, shielding the conventional control oil pipe 4 of control solenoid valve 31 "311BV". The pressure oil is directly introduced into the control chamber of hydraulic control valve 21 "711HV", forcing the valve core of "711HV" to switch, so that the pressure oil is introduced into the closing chamber and the opening chamber of the butterfly valve servo to return oil, driving the butterfly valve to close quickly. After the butterfly valve closes, shuttle valve 23 maintains its current position due to the pressure oil transmitted from pilot hydraulic control valve 22 "313HV", disconnecting the oil pipe 4 between control solenoid valve 31 "311BV" and hydraulic control valve 21 "711HV", realizing hydraulic interlocking and preventing misoperation.

[0020] When the emergency stop solenoid valve 32 "312BV" receives an external electrical protection signal, its internal oil pipe 4 switches, connecting the pressure oil that was originally connected to the control chamber of the pilot hydraulic control valve 22 "313HV" to the return oil. This causes the control chamber of the pilot hydraulic control valve 22 "313HV" to lose pressure and switch to the state where P and B are connected and T and A are connected. The subsequent actions are consistent with the action of the mechanical overspeed protection device. The system pressure oil enters the shuttle valve 23 through the P→B ​​port of the pilot hydraulic control valve 22 "313HV", pushing the shuttle valve 23 to switch and shielding the conventional control oil pipe 4. The pressure oil directly drives the hydraulic control valve 21 "711HV" to operate, forcing the butterfly valve to close. After closing, the shuttle valve 23 achieves hydraulic locking.

[0021] Furthermore, the control-level valve assembly of this device is integrated on the integrated block 1 to form a fixed structure. The control logic and the oil pipe 4 interface remain unchanged. The hydraulic control valve 21 "711HV" serves as the actuator level. Different specifications of valve assemblies can be replaced according to the volume of the butterfly valve relay. It is only necessary to ensure that it matches the oil pipe 4 interface of the control level. There is no need to change the control logic, thereby adapting to the needs of butterfly valves of different sizes and improving the versatility and extensibility of the equipment.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A butterfly valve control apparatus having mechanical overspeed protection linkage control comprising an integrated block, characterized by: An oil pipe is fixedly installed inside the integrated block. The oil pipe has multiple sections. A mechanical circuit assembly is provided on one side of the integrated block. When the mechanical overspeed protection device detects that the turbine speed exceeds a set threshold, the mechanical circuit assembly automatically closes the oil pipe at its output end. An electrical circuit assembly is provided on one side of the integrated block. The electrical circuit assembly closes the oil pipe under manual control. The electrical circuit assembly is connected in series with the mechanical circuit assembly.

2. The butterfly valve control apparatus with mechanical overspeed protection linkage control of claim 1, wherein: The mechanical circuit assembly includes a hydraulic control valve connected to an oil pipe. The hydraulic control valve is fixedly installed on one side of the integrated block. A pilot hydraulic control valve is fixedly installed on one side of the integrated block and is connected to an oil pipe. A shuttle valve is fixedly installed on the other side of the integrated block and is connected to an oil pipe.

3. The butterfly valve control apparatus with mechanical overspeed protection linkage control of claim 2, wherein: A hydraulic control valve is fixedly installed on one side of the integrated block, and the oil pipe at the output end of the pilot hydraulic control valve is connected to the input end of the shuttle valve.

4. The butterfly valve control apparatus having mechanical overspeed protection linkage control according to claim 3, characterized in that: The oil pipe at the output end of the shuttle valve is connected to an interface provided on one side of the integrated block, and the oil pipe at the output end of the shuttle valve is connected to the input end of the hydraulic control valve.

5. The butterfly valve control apparatus having mechanical overspeed protection linkage control as defined in claim 4 wherein: The circuit loop assembly includes a control solenoid valve, which is fixedly installed on one side of the integrated block. An emergency stop solenoid valve is fixedly installed on the top of the integrated block. The control solenoid valve is connected to the oil pipe, and the emergency stop solenoid valve is also connected to the oil pipe.

6. The butterfly valve control apparatus having mechanical overspeed protection linkage control as defined in claim 5 wherein: The oil pipe at the output end of the emergency stop solenoid valve is connected to the input end of the pilot hydraulic control valve, and the oil pipe at the output end of the control solenoid valve is connected to the input end of the shuttle valve.

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