Valve control system and control system

Abstract

The present disclosure relates to a valve control system and a control system, the system comprising at least two sets of control components and a linkage valve, the control components comprising at least a solenoid valve, a pressure switch and a control circuit, the pressure switch being configured to open when the pressure is greater than a preset pressure threshold, the control circuit being configured to stop supplying power to the solenoid valve when both pressure switches in the at least two sets of control components are open, the solenoid valve being configured to open when the power supply is stopped, and the linkage valve being configured to open when one or more solenoid valves in the at least two sets of control components are open.

Description

Technical Field

[0001] This disclosure relates to the field of generator set technology, and more specifically, to a valve control system and control system. Background Technology

[0002] With advancements in power generation technology, 100% large bypass is playing an increasingly important role in the startup and operation of large-capacity units, especially those with FCB (Fast Cut Back) functionality. It should be understood that FCB refers to the automatic control function that, when the unit is operating above a certain load, it can instantly disconnect from the grid due to a unit or grid fault, instantly shedding all external power supply loads while maintaining boiler operation at minimum load and ensuring the generator continues to operate with plant auxiliary power or remains operational even during shutdown.

[0003] However, in related technologies, when the pressure switch in the bypass control system is accidentally turned on, the bypass relay connected in series with it will be disconnected due to power failure, causing the bypass solenoid valve controlled by the bypass relay to lose power. At this time, the bypass solenoid valve on one side is accidentally turned on, but the bypass valve can only be allowed to open, resulting in severe pressure loss of the main steam, which brings great pressure and harm to the stable operation of the unit and the regulation of the safety valve. Summary of the Invention

[0004] To overcome the problems existing in related technologies, this disclosure provides a valve control system and a control system.

[0005] According to a first aspect of the present disclosure, a valve control system is provided, the system comprising at least two sets of control components and a linkage valve, wherein the control components include at least a solenoid valve, a pressure switch, and a control circuit.

[0006] The pressure switch is used to open when the pressure is greater than a preset pressure threshold.

[0007] The control circuit is used to stop supplying power to the solenoid valve when both pressure switches in the at least two sets of control components are open;

[0008] The solenoid valve is used to open when power is cut off;

[0009] The linkage valve is used to open when one or more of the at least two solenoid valves in the at least two sets of control components are open.

[0010] Optionally, the system includes a first control component and a second control component, wherein the first control component includes a first solenoid valve, a first pressure switch and a first control circuit;

[0011] The first control circuit includes a first pressure switch, a first target relay, a second target relay, and a first solenoid valve. The first end of the first pressure switch is used to connect to a power source, and the second end of the first pressure switch is connected to the first end of the coil of the first target relay. The second end of the coil of the first target relay is connected to the first solenoid valve through the normally closed contact of the first target relay. The normally closed contact of the second target relay is connected to both ends of the normally closed contact of the first target relay.

[0012] Optionally, the second control component includes a second solenoid valve, a second pressure switch, and a second control circuit.

[0013] The second control circuit includes a second pressure switch, a first target relay, a second target relay, and a second solenoid valve. The first end of the second pressure switch is used to connect to a power supply, and the second end of the second pressure switch is connected to the first end of the coil of the second target relay. The second end of the coil of the second target relay is connected to the second solenoid valve through the normally closed contact of the second target relay. The normally closed contact of the first target relay is connected to both ends of the normally closed contact of the second target relay.

[0014] Optionally, both the first pressure switch and the second pressure switch are used to open when the pressure is greater than a preset pressure threshold;

[0015] Both the first solenoid valve and the second solenoid valve are used to open when both the first pressure switch and the second pressure switch are open;

[0016] The linkage valve is connected to the first solenoid valve and the second solenoid valve, and is used to open when the first solenoid valve and / or the second solenoid valve is open.

[0017] Optionally, the system includes a third control component, a fourth control component, and a fifth control component, wherein the third control component includes a third solenoid valve, a third pressure switch, and a third control circuit;

[0018] The third control circuit includes a third pressure switch, a third target relay, a fifth target relay, and a third solenoid valve. The first end of the third pressure switch is used to connect to a power source, and the second end of the third pressure switch is connected to the first end of the coil of the third target relay. The second end of the coil of the third target relay is connected to the third solenoid valve through the normally closed contact of the third target relay. The normally closed contact of the fifth target relay is connected to both ends of the normally closed contact of the third target relay.

[0019] Optionally, the fourth control component includes a fourth solenoid valve, a fourth pressure switch, and a fourth control circuit;

[0020] The fourth control circuit includes a fourth pressure switch, a fourth target relay, a third target relay, and a fourth solenoid valve. The first end of the fourth pressure switch is used to connect to a power source, and the second end of the fourth pressure switch is connected to the first end of the coil of the fourth target relay. The second end of the coil of the fourth target relay is connected to the fourth solenoid valve through the normally closed contact of the fourth target relay. The normally closed contact of the third target relay is connected to both ends of the normally closed contact of the fourth target relay.

[0021] Optionally, the fifth control component includes a fifth solenoid valve, a fifth pressure switch, and a fifth power supply control circuit;

[0022] The fifth control circuit includes a fifth pressure switch, a fifth target relay, a fourth target relay, and a fifth solenoid valve. The first end of the fifth pressure switch is used to connect to a power source, and the second end of the fifth pressure switch is connected to the first end of the coil of the fifth target relay. The second end of the coil of the fifth target relay is connected to the fifth solenoid valve through the normally closed contact of the fifth target relay. The normally closed contact of the fourth target relay is connected to both ends of the normally closed contact of the fifth target relay.

[0023] Optionally, the third pressure switch, the fourth pressure switch, and the fifth pressure switch are all used to open when the pressure is greater than a preset pressure threshold.

[0024] One of the third, fourth, and fifth solenoid valves is used to open when any two of the third, fourth, and fifth pressure switches are open.

[0025] The linkage valve is connected to the third solenoid valve, the fourth solenoid valve and the fifth solenoid valve respectively, and is used to open when it is determined that at least one of the third solenoid valve, the fourth solenoid valve and the fifth solenoid valve is open.

[0026] Optionally, the third solenoid valve is configured to open when both the third pressure switch and the fifth pressure switch are open;

[0027] The fourth solenoid valve is used to open when both the third pressure switch and the fourth pressure switch are open;

[0028] The fifth solenoid valve is used to open when both the fourth and fifth pressure switches are open.

[0029] According to a second aspect of the present disclosure, a control system is provided, the control system including the valve control system described in the first aspect of the present disclosure.

[0030] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0031] The valve control system, based on the above technical solution, includes at least two sets of control components and a linkage valve. Each control component includes at least a solenoid valve, a pressure switch, and a control circuit. The pressure switch opens when the pressure exceeds a preset pressure threshold. The control circuit stops supplying power to the solenoid valve when both pressure switches in the at least two control components are open. The solenoid valve opens when power is cut off. The linkage valve opens when one or more of the at least two solenoid valves in the at least two control components are open. This allows the control circuit to stop supplying power to the solenoid valve when both pressure switches in the at least two control components are open. This prevents a faulty pressure switch in the bypass control system from malfunctioning and causing a bypass relay connected in series to disconnect due to power loss, thus avoiding severe pressure loss of the main steam caused by the opening of the bypass valve and improving the safe operation capability of the valve control system.

[0032] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0033] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0034] Figure 1 This is a schematic diagram of the structural connection of the generator unit bypass system in the current related technologies.

[0035] Figure 2 This is a schematic diagram of a valve control system according to an exemplary embodiment.

[0036] Figure 3 This is a schematic diagram illustrating another valve control system according to an exemplary embodiment.

[0037] Figure 4 This is a schematic diagram illustrating another valve control system according to an exemplary embodiment.

[0038] Figure 5 This is a schematic diagram illustrating another valve control system according to an exemplary embodiment.

[0039] Figure 6 This is a structural block diagram of a control system provided in an exemplary embodiment. Detailed Implementation

[0040] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0041] Before detailing the specific embodiments of this disclosure, the application scenarios of this disclosure will first be explained. This disclosure can be applied to the control scenarios of bypass control systems in power units. Currently, during the operation of a power unit, if it is running above a certain load and the unit or the power grid fails and disconnects from the grid, the unit will instantly shed all external power supply loads and maintain the boiler at the minimum load, maintaining the automatic control function of the generator running with plant power or shutting down without stopping the boiler. However, in related technologies, when the pressure switch in the bypass control system is accidentally opened, it will cause the bypass relay connected in series with it to disconnect due to power failure, causing the bypass solenoid valve controlled by the bypass relay to lose power. At this time, the bypass solenoid valve on one side is accidentally activated, but the bypass valve can only be allowed to open, resulting in severe depressurization of the main steam, which brings great pressure and harm to the stable operation of the unit and the regulation of the safety valve.

[0042] The bypass system of Unit A will now be used as an example to further illustrate the relevant technologies: Figure 1 As shown, Figure 1 This is a schematic diagram of the structural connection of the generator bypass system in the current related technology. The generator A includes pressure protection devices on both sides A and B. Each pressure protection device has 3 pressure switches (29B1, 29B2 and 29B3 as shown in the figure). When any pressure switch is activated, it triggers the high-pressure bypass valve on the same side to open through the equipment control circuit.

[0043] Assuming any pressure switch (e.g., 29B2) activates, its normally closed contacts 1 and 2 open, causing the 24V voltage to the drive terminal A1 of relay 29K2 to be lost. This causes the two normally open contacts 13-14 and 23-24 of relay 29K2 to open, resulting in the de-energization of the safety solenoid valves of the two high-pressure bypass valves on the same side. This connects the oil circuits of the upper and lower oil cylinders of the bypass valves, and the bypass valves are pulled open by their own springs.

[0044] To overcome the technical problems existing in the above-mentioned related technologies, this disclosure provides a valve control system and control system. Through the above technical solution, the valve control system includes at least two sets of control components and a linkage valve. Each control component includes at least a solenoid valve, a pressure switch, and a control circuit. The pressure switch is used to open when the pressure exceeds a preset pressure threshold. The control circuit is used to stop supplying power to the solenoid valve when both pressure switches in the at least two sets of control components are open. The solenoid valve is used to open when power is stopped. The linkage valve is used to open when one or more of the at least two solenoid valves in the at least two sets of control components are open. This allows the control circuit to stop supplying power to the solenoid valve when both pressure switches in the at least two sets of control components are open. This prevents a faulty pressure switch in the bypass control system from causing a bypass relay connected in series to disconnect due to power failure, thus avoiding severe pressure loss of the main steam caused by the opening of the bypass valve and improving the safe operation capability of the valve control system.

[0045] The present disclosure will now be described in conjunction with specific embodiments.

[0046] Figure 2 This is a schematic diagram of a valve control system according to an exemplary embodiment, such as... Figure 2 As shown, the system 1 includes at least two sets of control components and a linkage valve 12. The control components include at least a solenoid valve 111, a pressure switch 112, and a control circuit 113.

[0047] The pressure switch 112 is used to open when the pressure exceeds a preset pressure threshold.

[0048] The control circuit 113 is used to stop supplying power to the solenoid valve when both pressure switches in the at least two sets of control components are open;

[0049] The solenoid valve 111 is used to open when power is cut off;

[0050] The linkage valve 12 is used to open when one or more of the at least two solenoid valves 111 in the at least two sets of control components are open.

[0051] The linkage valve 12 may include a high-pressure bypass valve, which is used to determine its own valve opening and closing state based on the valve opening and closing state of one or more of the at least two solenoid valves 111 in the at least two sets of control components.

[0052] In some embodiments, such as Figure 3As shown, the control component may include at least a first control component and a second control component, and the control circuit 113 may include at least a first control circuit 1131 and a second control circuit 1132; the first control component may include at least a first solenoid valve 1111, a first pressure switch 1121 and a first control circuit 1131, and the second control component may include at least a second solenoid valve 1112, a second pressure switch 1122 and a second control circuit 1132.

[0053] For example, in one possible implementation, in the first control component, the first pressure switch 1121 can be opened when the detected pressure is greater than a preset pressure threshold, and the contacts (B11-B12) of the first pressure switch 1121 are opened; and in the second control component, the second pressure switch 1122 can be opened when the detected pressure is greater than a preset pressure threshold, and the contacts (B21-B22) of the second pressure switch 1122 are opened. Then, when it is determined that the contacts (B11-B12) of the first pressure switch 1121 are open and the contacts (B21-B22) of the second pressure switch 1122 are open, the voltage of the first control circuit 1131 and the second control circuit 1132 can be lost. As a result, the first control circuit 1131 controls the cessation of power supply to the first solenoid valve 1111, and the second control circuit 1132 controls the cessation of power supply to the second solenoid valve 1112. The first solenoid valve 1111 is de-energized and opens, and the second solenoid valve 1112 is de-energized and opens. Finally, when both the first solenoid valve 1111 and the second solenoid valve 1112 are open, the linkage valve opens.

[0054] It should be noted that when the first solenoid valve 1111 and / or the second solenoid valve 1112 are open, the linkage valve can also be opened.

[0055] In another possible implementation, in the first control component, the first pressure switch 1121 may not open when the detected pressure is less than or equal to a preset pressure threshold, and the contacts (B11-B12) of the first pressure switch 1121 are closed; and in the second control component, the second pressure switch 1122 may open when the detected pressure is greater than the preset pressure threshold, and the contacts (B21-B22) of the second pressure switch 1122 are open. Then, when it is determined that the contacts (B11-B12) of the first pressure switch 1121 are closed and the contacts (B21-B22) of the second pressure switch 1122 are open, the first control circuit 1131 and the second control circuit 1132 can be energized. Thus, the first control circuit 1131 supplies power to the first solenoid valve 1111, and the second control circuit 1132 supplies power to the second solenoid valve 1112. The first solenoid valve 1111 is energized and closes, and the second solenoid valve 1112 is energized and closes. Finally, when both the first solenoid valve 1111 and the second solenoid valve 1112 are closed, the linkage valve closes.

[0056] It should be noted that the linkage valve closes only when both the first solenoid valve 1111 and the second solenoid valve 1112 are closed.

[0057] The valve control system, based on the above technical solution, includes at least two sets of control components and a linkage valve. Each control component includes at least a solenoid valve, a pressure switch, and a control circuit. The pressure switch opens when the pressure exceeds a preset pressure threshold. The control circuit stops supplying power to the solenoid valve when both pressure switches in the at least two control components are open. The solenoid valve opens when power is cut off. The linkage valve opens when one or more of the at least two solenoid valves in the at least two control components are open. This allows the control circuit to stop supplying power to the solenoid valve when both pressure switches in the at least two control components are open. This prevents a faulty pressure switch in the bypass control system from malfunctioning and causing the bypass relay connected in series to disconnect due to power loss, thus avoiding severe pressure loss of the main steam caused by the opening of the bypass valve and improving the safe operation capability of the valve control system.

[0058] In some embodiments, such as Figure 4 As shown, the system includes a first control component and a second control component. The first control component includes a first solenoid valve 1111, a first pressure switch 1121, and a first control circuit 1131. The second control component includes a second solenoid valve 1112, a second pressure switch 1122, and a second control circuit 1132.

[0059] The first control circuit 1131 includes a first pressure switch 1121, a first target relay 1141, a second target relay 1142, and a first solenoid valve 1111. The first end of the first pressure switch 1121 is connected to a power supply, and the second end of the first pressure switch 1121 is connected to the first end of the coil of the first target relay 1141. The second end of the coil of the first target relay 1141 is connected to the first solenoid valve 1111 through the normally closed contact of the first target relay 1141. The normally closed contact of the second target relay 1142 is connected to both ends of the normally closed contact of the first target relay 1141.

[0060] The second control circuit 1132 includes a second pressure switch 1122, a first target relay 1141, a second target relay 1142, and a second solenoid valve 1112. The first end of the second pressure switch 1122 is used to connect to a power supply, and the second end of the second pressure switch 1122 is connected to the first end of the coil of the second target relay 1142. The second end of the coil of the second target relay 1142 is connected to the second solenoid valve 1112 through the normally closed contact of the second target relay 1142. The normally closed contact of the first target relay 1141 is connected to both ends of the normally closed contact of the second target relay 1142.

[0061] For example, in one possible implementation, in the first control component, the first pressure switch 1121 can be opened when the detected pressure is greater than a preset pressure threshold, and the contacts (B11-B12) of the first pressure switch 1121 are opened, causing the 24V voltage at the first end of the coil of the first target relay 1141 connected to the first pressure switch 1121 to be lost, and the contacts (K11-K12) and (K13-K14) of the first target relay 1141 to be opened; and in the second control component, the second pressure switch 1122 can be opened when the detected pressure is greater than a preset pressure threshold, and the contacts (B21-B22) of the second pressure switch 1122 are opened, causing the 24V voltage at the first end of the coil of the second target relay 1142 connected to the second pressure switch 1122 to be lost, and the contacts (K21-K22) and (K23-K24) of the second target relay 1142 to be opened. Then, when it is determined that the contacts (K11-K12) of the first target relay 1141 and the contacts (K23-K24) of the second target relay 1142 are both open, the voltage of the first solenoid valve 1111 can be lost, thereby opening. And when it is determined that the contacts (K13-K14) of the first target relay 1141 and the contacts (K21-K21) of the second target relay 1142 are both open, the voltage of the second solenoid valve 1112 can be lost, thereby opening. Finally, when both the first solenoid valve 1111 and the second solenoid valve 1112 are open, the linkage valve closes.

[0062] In another possible implementation, in the first control component, the first pressure switch 1121 can be closed when the detected pressure is less than or equal to a preset pressure threshold. The contacts (B11-B12) of the first pressure switch 1121 are turned on, so that the first terminal of the coil of the first target relay 1141 connected to the first pressure switch 1121 receives 24V, and the contacts (K11-K12) and (K13-K14) of the first target relay 1141 are turned on. In the second control component, the second pressure switch 1122 can be opened when the detected pressure is greater than the preset pressure threshold. The contacts (B21-B22) of the second pressure switch 1122 are turned off, so that the 24V voltage at the first terminal of the coil of the second target relay 1142 connected to the second pressure switch 1122 is lost, and the contacts (K21-K22) and (K23-K24) of the second target relay 1142 are turned off. Then, when it is determined that the contacts (K11-K12) of the first target relay 1141 are on and the contacts (K23-K24) of the second target relay 1142 are off, the first solenoid valve 1111 can be energized and thus closed. And when it is determined that the contacts (K13-K14) of the first target relay 1141 are on and the contacts (K21-K21) of the second target relay 1142 are off, the second solenoid valve 1112 can be energized and thus closed. Finally, when the first solenoid valve 1111 is closed and the second solenoid valve 1112 is open, the linkage valve closes.

[0063] By adopting the above technical solution, the first pair of contacts of the first target relay 1141 can be connected in parallel to the second pair of contacts of the second target relay 1142, and the first pair of contacts of the second target relay 1142 can be connected in parallel to the second pair of contacts of the first target relay 1141. In this way, the valve status of the linkage valve can be determined by simultaneously determining the switching status of the first pressure switch 1121 and the second pressure switch 1122. This can prevent the bypass relay connected in series from disconnecting due to power failure because a pressure switch in the bypass control system malfunctions, thus avoiding the opening of the bypass valve and causing serious pressure loss of the main steam, thereby improving the safe operation capability of the valve control system.

[0064] In some embodiments, both the first pressure switch 1121 and the second pressure switch 1122 are used to open when the pressure is greater than a preset pressure threshold.

[0065] Optionally, the first solenoid valve 1111 and the second solenoid valve 1112 are both used to open when the first pressure switch 1121 and the second pressure switch 1122 are both open; the linkage valve is connected to the first solenoid valve 1111 and the second solenoid valve 1112 and is used to open when the first solenoid valve 1111 and / or the second solenoid valve 1112 are open.

[0066] In some embodiments, such as Figure 5 As shown, the system includes a third control component, a fourth control component, and a fifth control component.

[0067] Optionally, the third control component may include a third solenoid valve 1113, a third pressure switch 1123, and a third control circuit 1133; the fourth control component may include a fourth solenoid valve 1114, a fourth pressure switch 1124, and a fourth control circuit 1134; and the fifth control component may include a fifth solenoid valve 1115, a fifth pressure switch 1125, and a fifth control circuit 1135.

[0068] Specifically, the third control circuit 1133 includes a third pressure switch 1123, a third target relay 1143, a fifth target relay 1145, and a third solenoid valve 1113. The first end of the third pressure switch 1123 is used to connect to the power supply, and the second end of the third pressure switch 1123 is connected to the first end of the coil of the third target relay 1143. The second end of the coil of the third target relay 1143 is connected to the third solenoid valve 1113 through the normally closed contact of the third target relay 1143. The normally closed contact of the fifth target relay 1145 is connected to both ends of the normally closed contact of the third target relay 1143.

[0069] The fourth control circuit 1134 includes a fourth pressure switch 1124, a fourth target relay 1144, a third target relay 1143, and a fourth solenoid valve 1114. The first end of the fourth pressure switch 1124 is used to connect to the power supply, and the second end of the fourth pressure switch 1124 is connected to the first end of the coil of the fourth target relay 1144. The second end of the coil of the fourth target relay 1144 is connected to the fourth solenoid valve 1114 through the normally closed contact of the fourth target relay 1144. The normally closed contact of the third target relay 1143 is connected to both ends of the normally closed contact of the fourth target relay 1144.

[0070] The fifth control circuit 1135 includes a fifth pressure switch 1125, a fifth target relay 1145, a fourth target relay 1144, and a fifth solenoid valve 1115. The first end of the fifth pressure switch 1125 is used to connect to the power supply, and the second end of the fifth pressure switch 1125 is connected to the first end of the coil of the fifth target relay 1145. The second end of the coil of the fifth target relay 1145 is connected to the fifth solenoid valve 1115 through the normally closed contact of the fifth target relay 1145. The normally closed contact of the fourth target relay 1144 is connected to both ends of the normally closed contact of the fifth target relay 1145.

[0071] For example, in one possible implementation, in the third control component, the third pressure switch 1123 can open when the detected pressure is greater than a preset pressure threshold, and the contacts (B31-B32) of the third pressure switch 1123 open, causing the 24V voltage at the first end of the coil of the third target relay 1143 connected to the third pressure switch 1123 to be lost, and the contacts (K31-K32) and (K33-K34) of the third target relay 1143 open; and the fourth pressure switch 1124 can close when the detected pressure is less than or equal to the preset pressure threshold, and the contacts (B41-B42) of the fourth pressure switch 1124 close. When the pressure is turned on, the first terminal of the coil of the fourth target relay 1144 connected to the fourth pressure switch 1124 receives a 24V voltage, and the contacts (K41-K42) and (K43-K44) of the fourth target relay 1144 are turned on. When the detected pressure is less than or equal to a preset pressure threshold, the fifth pressure switch 1125 can be turned off. When the detected pressure is less than or equal to a preset pressure threshold, the contacts (B51-B52) of the fifth pressure switch 1125 are turned on, the first terminal of the coil of the fifth target relay 1145 connected to the fifth pressure switch 1125 receives a 24V voltage, and the contacts (K51-K52) and (K53-K54) of the fourth target relay 1144 are turned on.

[0072] Then, when it is determined that the contacts (K31-K32) of the third target relay 1143 are open and the contacts (K53-K54) of the fifth target relay 1145 are closed, the third solenoid valve 1113 can be energized and thus closed. When it is determined that the contacts (K41-K42) of the fourth target relay 1144 are closed and the contacts (K33-K34) of the third target relay 1143 are open, the fourth solenoid valve 1114 can be energized and thus closed. When it is determined that the contacts (K51-K52) of the fifth target relay 1145 are closed and the contacts (K43-K44) of the fourth target relay 1144 are closed, the fifth solenoid valve 1115 can be energized and thus closed. Finally, when the third solenoid valve 1113, the fourth solenoid valve 1114, and the fifth solenoid valve 1115 are closed, the linkage valve is closed.

[0073] In another possible implementation, in this third control component, the third pressure switch 1123 can open when the detected pressure exceeds a preset pressure threshold, and its contacts (B31-B32) open, causing the 24V voltage at the first terminal of the coil of the third target relay 1143 connected to the third pressure switch 1123 to be lost, and the contacts (K31-K32) and (K33-K34) of the third target relay 1143 to open; and the fourth pressure switch 1124 can open when the detected pressure exceeds a preset pressure threshold, and its contacts (B41-B42) open. This causes the 24V voltage at the first end of the coil of the fourth target relay 1144, which is connected to the fourth pressure switch 1124, to be lost, and the contacts (K41-K42) and (K43-K44) of the fourth target relay 1144 to open. The fifth pressure switch 1125 can be closed when the detected pressure is less than or equal to a preset pressure threshold, and the contacts (B51-B52) of the fifth pressure switch 1125 are turned on, so that the first end of the coil of the fifth target relay 1145, which is connected to the fifth pressure switch 1125, receives a 24V voltage, and the contacts (K51-K52) and (K53-K54) of the fourth target relay 1144 are turned on.

[0074] Then, when it is determined that the contacts (K31-K32) of the third target relay 1143 are open and the contacts (K53-K54) of the fifth target relay 1145 are closed, the third solenoid valve 1113 can be energized and thus closed. When it is determined that the contacts (K41-K42) of the fourth target relay 1144 are open and the contacts (K33-K34) of the third target relay 1143 are open, the fourth solenoid valve 1114 can be de-energized and opened. When it is determined that the contacts (K51-K52) of the fifth target relay 1145 are closed and the contacts (K43-K44) of the fourth target relay 1144 are open, the fifth solenoid valve 1115 can be energized and thus closed. Finally, when the third solenoid valve 1113 is closed, the fourth solenoid valve 1114 is open, and the fifth solenoid valve 1115 is closed, the linkage valve opens.

[0075] By adopting the above technical solution, by connecting a pair of contacts of another target relay in parallel to a pair of contacts of each target relay, the valve status of the linkage valve can be determined simultaneously based on the switching status of the pressure switch corresponding to the target relay and the switching status of the pressure switch corresponding to the other target relay. This can prevent the bypass relay connected in series from disconnecting due to power failure caused by a faulty operation of a pressure switch in the bypass control system, thus avoiding severe pressure loss of the main steam caused by the opening of the bypass valve and improving the safe operation capability of the valve control system.

[0076] In one embodiment, the third control circuit 1133 may further include a third bypass relay, the fourth control circuit 1134 may further include a fourth bypass relay, and the fifth control circuit 1135 may further include a fifth bypass relay.

[0077] In one embodiment, the third pressure switch 1123, the fourth pressure switch, and the fifth pressure switch 1125 are all used to open when the pressure is greater than a preset pressure threshold.

[0078] Optionally, one of the third solenoid valve 1113, the fourth solenoid valve 1114, and the fifth solenoid valve 1115 is configured to open when any two of the third pressure switch 1123, the fourth pressure switch 1124, and the fifth pressure switch 1125 are open; the linkage valve is connected to all of the third solenoid valve 1113, the fourth solenoid valve 1114, and the fifth solenoid valve 1115, and is configured to open when at least one of the third solenoid valve 1113, the fourth solenoid valve 1114, and the fifth solenoid valve 1115 is determined to be open.

[0079] For example, the third solenoid valve 1113 is used to open when both the third pressure switch 1123 and the fifth pressure switch 1125 are open; the fourth solenoid valve 1114 is used to open when both the third pressure switch 1123 and the fourth pressure switch 1124 are open; and the fifth solenoid valve 1115 is used to open when both the fourth pressure switch 1124 and the fifth pressure switch 1125 are open.

[0080] Figure 6 This is a structural block diagram of a control system provided in an exemplary embodiment, such as Figure 6 As shown, this disclosure also provides a control system 600, including the valve control system 1 provided above.

[0081] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0082] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0083] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A valve control system, characterized in that, The valve control system includes at least two sets of control components and a linkage valve. The control components include at least a solenoid valve, a pressure switch, and a control circuit. The pressure switch is used to open when the pressure is greater than a preset pressure threshold. The control circuit is configured to stop supplying power to the solenoid valve when both pressure switches in the at least two sets of control components are open; and to continue supplying power to the solenoid valve when one pressure switch in the at least two sets of control components is open and the other pressure switch is not open. The solenoid valve is used to open when power is cut off and to close when power is continued. The linkage valve is used to open when one or more of the at least two solenoid valves in the at least two sets of control components are open; and also to close when both of the at least two solenoid valves in the at least two sets of control components are closed.

2. The valve control system according to claim 1, characterized in that, The valve control system includes a first control component and a second control component. The first control component includes a first solenoid valve, a first pressure switch, and a first control circuit. The first control circuit includes a first pressure switch, a first target relay, a second target relay, and a first solenoid valve. The first end of the first pressure switch is used to connect to a power source, and the second end of the first pressure switch is connected to the first end of the coil of the first target relay. The second end of the coil of the first target relay is connected to the first solenoid valve through the normally closed contact of the first target relay. The normally closed contact of the second target relay is connected to both ends of the normally closed contact of the first target relay.

3. The valve control system according to claim 2, characterized in that, The second control component includes a second solenoid valve, a second pressure switch, and a second control circuit. The second control circuit includes a second pressure switch, a first target relay, a second target relay, and a second solenoid valve. The first end of the second pressure switch is used to connect to a power supply, and the second end of the second pressure switch is connected to the first end of the coil of the second target relay. The second end of the coil of the second target relay is connected to the second solenoid valve through the normally closed contact of the second target relay. The normally closed contact of the first target relay is connected to both ends of the normally closed contact of the second target relay.

4. The valve control system according to claim 3, characterized in that, Both the first pressure switch and the second pressure switch are used to open when the pressure is greater than a preset pressure threshold; Both the first solenoid valve and the second solenoid valve are used to open when both the first pressure switch and the second pressure switch are open; The linkage valve is connected to the first solenoid valve and the second solenoid valve, and is used to open when the first solenoid valve and / or the second solenoid valve is open.

5. The valve control system according to claim 1, characterized in that, The valve control system includes a third control component, a fourth control component, and a fifth control component. The third control component includes a third solenoid valve, a third pressure switch, and a third control circuit. The third control circuit includes a third pressure switch, a third target relay, a fifth target relay, and a third solenoid valve. The first end of the third pressure switch is used to connect to a power source, and the second end of the third pressure switch is connected to the first end of the coil of the third target relay. The second end of the coil of the third target relay is connected to the third solenoid valve through the normally closed contact of the third target relay. The normally closed contact of the fifth target relay is connected to both ends of the normally closed contact of the third target relay.

6. The valve control system according to claim 5, characterized in that, The fourth control component includes a fourth solenoid valve, a fourth pressure switch, and a fourth control circuit. The fourth control circuit includes a fourth pressure switch, a fourth target relay, a third target relay, and a fourth solenoid valve. The first end of the fourth pressure switch is used to connect to a power source, and the second end of the fourth pressure switch is connected to the first end of the coil of the fourth target relay. The second end of the coil of the fourth target relay is connected to the fourth solenoid valve through the normally closed contact of the fourth target relay. The normally closed contact of the third target relay is connected to both ends of the normally closed contact of the fourth target relay.

7. The valve control system according to claim 6, characterized in that, The fifth control component includes a fifth solenoid valve, a fifth pressure switch, and a fifth power supply control circuit. The fifth control circuit includes a fifth pressure switch, a fifth target relay, a fourth target relay, and a fifth solenoid valve. The first end of the fifth pressure switch is used to connect to a power source, and the second end of the fifth pressure switch is connected to the first end of the coil of the fifth target relay. The second end of the coil of the fifth target relay is connected to the fifth solenoid valve through the normally closed contact of the fifth target relay. The normally closed contact of the fourth target relay is connected to both ends of the normally closed contact of the fifth target relay.

8. The valve control system according to claim 7, characterized in that, The third pressure switch, the fourth pressure switch, and the fifth pressure switch are all used to open when the pressure is greater than a preset pressure threshold. One of the third, fourth, and fifth solenoid valves is used to open when any two of the third, fourth, and fifth pressure switches are open. The linkage valve is connected to the third solenoid valve, the fourth solenoid valve and the fifth solenoid valve respectively, and is used to open when it is determined that at least one of the third solenoid valve, the fourth solenoid valve and the fifth solenoid valve is open.

9. The valve control system according to claim 8, characterized in that, The third solenoid valve is used to open when both the third pressure switch and the fifth pressure switch are open; The fourth solenoid valve is used to open when both the third pressure switch and the fourth pressure switch are open; The fifth solenoid valve is used to open when both the fourth and fifth pressure switches are open.

10. A control system, characterized in that, The control system includes the valve control system according to any one of claims 1-9.

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