An opening degree control device for a blowdown system

Abstract

The application provides an opening degree control device based on a blowdown system. The opening degree control device comprises a relay module and a plurality of limit switches. A driving module is connected with a valve of a blowdown valve, and under the control of a first control end of the driving module, the driving module controls the valve to move from zero position to full opening position in a first direction, and under the control of a second control end of the driving module, the driving module controls the valve to move from full opening position to zero position in a second direction, and the valve is in a completely closed state when at zero position. The relay module is connected with the driving module through the limit switches, and is used for controlling the driving module to drive the valve to move to an intermediate position from the first direction or to move to the intermediate position from the second direction. In this way, the valve can return to the intermediate position at any position, solving the problem of blowdown amount control failure caused by single control when the valve can only return to the intermediate position from a fixed position, avoiding water resource waste, and improving the control precision and operation reliability of the blowdown system.

Description

Technical Field

[0001] This invention relates to the field of sewage discharge technology, and in particular to an opening control device based on a sewage discharge system. Background Technology

[0002] In the prior art, the opening control methods of sewage discharge systems include full-open position control, zero-position control, and intermediate position control. Full-open position control enables the valve to be fully opened, zero-position control enables the valve to be fully closed, and intermediate position control enables the valve to be partially opened.

[0003] Currently, because the port connection method of the sewage system is fixed, the way the valve returns to the zero position is also fixed. For example, in one connection method, the valve can only return from the zero position to the middle position, but not from the fully open position. During normal operation, if the valve is stuck in the fully open position due to a malfunction or external force, since the conductivity of the liquid is within the normal range, that is, the sewage system sends a middle position command, but because the way the valve returns to the middle position is fixed (zero position - middle position), the valve cannot return from the fully open position to the zero position. This causes the sewage valve to remain in the fully open state, and even if the boiler water quality (conductivity) has returned to normal, it will cause continuous and excessive sewage waste. Summary of the Invention

[0004] This invention provides an opening control device for a sewage discharge system. A relay module and a limit switch control the drive module to move the valve from a first direction to the intermediate position, or from a second direction to the intermediate position. In this way, the valve can return to the intermediate position from any location, solving the problem of sewage discharge control failure caused by the single control method when the valve can only return to the intermediate position from a fixed position. This avoids water waste and improves the control accuracy and operational reliability of the sewage discharge system.

[0005] In a first aspect, embodiments of the present invention provide an opening control device based on a sewage system, wherein the sewage system includes a drive module and a sewage valve; the opening control device includes a relay module and multiple limit switches; The drive module is connected to the drain valve. Under the control of the first control terminal of the drive module, the drive module controls the valve to move from the zero position to the fully open position in the first direction. Under the control of the second control terminal of the drive module, the drive module controls the valve to move from the fully open position to the zero position in the second direction. When the valve is in the fully open position, the drain valve is in a fully open state. When the valve is in the zero position, the drain valve is in a fully closed state. The relay module is connected to the drive module through the limit switch and is used to control the drive module to drive the valve to move from a first direction to the middle position, or from a second direction to the middle position. When the valve is in the middle position, the drain valve is in a semi-open state.

[0006] Optionally, the plurality of limit switches include a first limit switch, a second limit switch, and a third limit switch; The first limit switch is used to control the drive module to stop working when the valve is detected to be in the fully open position; the second limit switch is used to control the drive module to stop working when the valve is detected to be in the zero position; and the third limit switch is used to control the drive module to stop working when the valve is detected to be in the intermediate position.

[0007] Optionally, the relay module includes multiple connection terminals and multiple relay units; The plurality of connection terminals include an on control terminal, an off control terminal, a switching control terminal, a first power terminal, a second power terminal, and an intermediate command terminal; The plurality of relay units include a first relay unit, a second relay unit, and a third relay unit. The first relay unit includes a first relay body and a first normally open contact. The second relay unit includes a second relay body and a first normally closed contact. The third relay unit includes a third relay body, a second normally open contact, a third normally open contact, and a second normally closed contact. The first end of the first limit switch is connected to the opening control terminal, the second end is connected to the first control terminal of the drive module, and the third end is connected to the first power terminal. The first power terminal is connected to the first relay body. The first end of the second limit switch is connected to the closing control terminal, the second end is connected to the second control terminal of the drive module, the third end is connected to the second power terminal, and the second power terminal is connected to the second relay body. The first end of the third limit switch is connected to the intermediate command terminal, the second end is connected to the switching control terminal, and the third end is connected to the circuit. The intermediate command terminal is connected to the third relay body. The first normally open contact and the first normally closed contact are connected in series between the intermediate command terminal and the third relay body. The second normally open contact and the first normally open contact are connected in parallel. The switching control terminal is connected to the opening control terminal through the second normally closed contact and also to the closing control terminal through the third normally open contact.

[0008] Optionally, during the first opening control process, after the valve moves to the fully open position, the first and third ends of the first limit switch are connected, and the first and second ends are disconnected. The first and second ends of the second limit switch are connected, and the first and third ends are disconnected, so that the first relay body is energized, the second relay body is de-energized, and the third relay body is energized and self-locked, so that the switching control terminal is connected to the closing control terminal through the third normally open contact. Then, the first end of the second limit switch is connected to the second control terminal of the drive module to drive the valve to move from the fully open position to the zero position in the second direction. When it moves to the intermediate position, the drive module is controlled to stop working through the third limit switch.

[0009] Optionally, during the second opening control process, after the valve moves to the zero position, the first and third ends of the second limit switch are connected, and the first and second ends are disconnected. The first and second ends of the first limit switch are connected, and the first and third ends are disconnected, so that the second relay body is energized, the first relay body is de-energized, and the third relay body is de-energized, so that the switching control terminal is connected to the opening control terminal through the second normally closed contact. Then, the first end of the first limit switch is connected to the first control terminal of the drive module to drive the valve to move from the zero position to the fully open position in the first direction. When it moves to the intermediate position, the drive module is stopped by the third limit switch.

[0010] Optionally, during the third opening control process, a control signal is sent to the opening control terminal, the first end of the first limit switch and the first control terminal of the drive module are connected, the drive module drives the valve to move from the zero position to the fully open position in the first direction, and when it moves to the fully open position, the drive module is controlled to stop working by the first limit switch.

[0011] Optionally, during the fourth opening control process, a control signal is sent to the closing control terminal, the first end of the second limit switch and the second control terminal of the drive module are connected, the drive module drives the valve to move from the fully open position to the zero position in the second direction, and when it moves to the zero position, the drive module is controlled to stop working by the second limit switch.

[0012] Optionally, the sewage discharge system further includes a boiler and a conductivity detection device. The conductivity detection device is connected to the boiler and the relay module respectively, and is used to detect the conductivity of the liquid in the boiler. When the conductivity is detected to be within a first preset range, a first enable signal is sent to the opening control terminal to perform a third opening control process. When the conductivity is detected to be within a second preset range, a second enable signal is sent to the switching control terminal to perform a first opening control process or a second opening control process. When the conductivity is detected to be within a third preset range, a third enable signal is sent to the closing control terminal to perform a fourth opening control process.

[0013] Optionally, during the third or fourth opening control process, the control of the third limit switch fails.

[0014] Optionally, the drive module includes a drive device and a motor. The drive device is connected to the motor, and the motor is connected to the valve. The drive device is used to drive the motor to rotate forward so as to move the valve from the zero position to the fully open position in a first direction. The drive device is also used to drive the motor to rotate in reverse so as to move the valve from the fully open position to the zero position in a second direction.

[0015] In summary, the opening control device in this embodiment of the invention includes a relay module and multiple limit switches. The drive module is connected to the drain valve. Under the control of the first control terminal of the drive module, the drive module controls the valve to move from the zero position to the fully open position in a first direction. Under the control of the second control terminal of the drive module, the drive module controls the valve to move from the fully open position to the zero position in a second direction. When the valve is in the zero position, the drain valve is in a completely closed state. The relay module is connected to the drive module through the limit switches and is used to control the drive module to move the valve from the first direction to the intermediate position, or from the second direction to the intermediate position. In this way, the valve can return to the intermediate position from any position, solving the problem of drain volume control failure caused by the single control method when the valve can only return to the intermediate position from a fixed position. This avoids water waste and improves the control accuracy and operational reliability of the drain system. Attached Figure Description

[0016] Figure 1 This is a simplified structural diagram of an opening control device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the opening control device provided in an embodiment of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be fully described below with reference to the accompanying drawings in the embodiments of this invention, through specific implementation methods. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort fall within the protection scope of this invention.

[0018] Figure 1 This is a simplified structural diagram of an opening control device provided in an embodiment of the present invention. See also... Figure 1 The sewage system includes a drive module 10 and a sewage valve 20. The opening control device includes a relay module 30 and multiple limit switches 40. The drive module 10 is connected to the valve of the sewage valve 20. Under the control of the first control terminal of the drive module 10, the drive module 10 controls the valve to move from the zero position to the fully open position in a first direction. Under the control of the second control terminal of the drive module 10, the drive module 10 controls the valve to move from the fully open position to the zero position in a second direction. When the valve is in the fully open position, the sewage valve 20 is in a fully open state. When the valve is in the zero position, the sewage valve 20 is in a fully closed state. The relay module 30 is connected to the drive module 10 through the limit switches 40 and is used to control the drive module 10 to drive the valve to move from the first direction to the intermediate position, or from the second direction to the intermediate position. When the valve is in the intermediate position, the sewage valve 10 is in a half-open state.

[0019] Specifically, such as Figure 1As shown, the sewage system includes a drive module 10 and a sewage valve 20. The drive module 10 is mechanically connected to the sewage valve 20, thereby driving the valve's movement direction through the drive module 10. For example, the drive module 10 can be driven in both forward and reverse directions. When the first control terminal of the drive module 10 is energized, the drive module 10 rotates forward, controlling the valve to move from the zero position to the fully open position in the first direction. When the second control terminal of the drive module 10 is energized, the drive module 10 rotates in reverse, controlling the valve to move from the fully open position to the zero position in the second direction. When the valve is in the zero position, the sewage valve 20 is completely closed, meaning it cannot discharge sewage. When the valve is in the fully open position, the sewage valve 20 is fully open, meaning it discharges sewage at its maximum opening. Therefore, the first direction can be the opening direction of the sewage valve 20, and the second direction can be the closing direction of the sewage valve 20. The opening control module also includes multiple limit switches 40. The function of the limit switches 40 is to control the drive module 10 to stop working after the valve moves to the set position, thereby controlling the valve to be in the preset position. For example, when the valve moves to the fully open position, the valve is controlled to stop so that the drain valve 20 is in a fully open state; or when the valve moves to the zero position, the valve is controlled to stop so that the drain valve 20 is in a fully closed state; or when the valve moves to the intermediate position, the valve is controlled to stop so that the drain valve 20 is in a half-open state.

[0020] In existing technologies, the control method for the intermediate position is fixed and singular. For example, when the control circuit for the intermediate position is connected to the control circuit for the fully open position, the valve can only return from the zero position to the intermediate position in the first direction (opening direction) and cannot return from the fully open position to the intermediate position. In this case, if the valve is stuck in the fully open position due to a malfunction or external force, since the conductivity of the liquid is in the normal range, that is, the sewage system sends an intermediate position enable command, but because the way the valve returns to the intermediate position is fixed (zero position - intermediate position), the valve cannot return from the fully open position to the intermediate position, which in turn causes the sewage valve to remain in the fully open state. Even if the boiler water quality (conductivity) has returned to normal, it will cause continuous and excessive sewage waste. Similarly, when the control circuit for the intermediate position is connected to the control circuit for the fully closed position, the valve can only return from the fully open position to the zero position in the second direction (the closing direction), and cannot return from the zero position to the fully open position. When the boiler is started, if the valve is stuck in the zero position and the conductivity of the liquid is within the normal range, that is, the sewage system sends an intermediate position enable command, but because the way the valve returns to the intermediate position is fixed (fully open position - intermediate position), the valve cannot return from the zero position to the intermediate position. It must wait until the conductivity exceeds the standard before it is fully opened for sewage discharge, resulting in inaccurate control.

[0021] To this end, this embodiment of the invention includes a relay module 30. The relay module 30 and the limit switch 40 jointly control the drive module 10, enabling the valve to return to the intermediate position from any position (zero or fully open). Specifically, under the action of the relay module 30 and the limit switch 40, the first control terminal of the drive module 10 can be energized, thereby driving the valve to move from the zero position to the fully open position in the first direction (opening direction) to open the drain valve 20. When it reaches the intermediate position, the limit switch 40 controls the valve drive module 10 to stop, thus controlling the valve to stop at the intermediate position. Alternatively, under the action of the relay module 30 and the limit switch 40, the second control terminal of the drive module 10 can be energized, thereby driving the valve to move from the fully open position to the zero position in the second direction (closing direction) to close the drain valve 20. When it reaches the intermediate position, the limit switch 40 controls the valve drive module 10 to stop, thus controlling the valve to stop at the intermediate position. In this way, the valve can return to the middle position from any position, which solves the problem of sewage discharge control failure caused by the single control method when the valve can only return to the middle position from a fixed position in the background technology mentioned above. This avoids water waste and improves the control accuracy and operational reliability of the sewage system.

[0022] It should be noted that the drive module 10 may include a drive device and a motor. The drive device is connected to the motor, and the motor is connected to the valve. The drive device is used to drive the motor to rotate forward, so as to move the valve from the zero position to the fully open position in a first direction. The drive device is also used to drive the motor to rotate in reverse, so as to move the valve from the fully open position to the zero position in a second direction. The embodiments of the present invention do not limit the specific structure of the drive module 10, and those skilled in the art can set it as needed.

[0023] In summary, the opening control device in this embodiment of the invention includes a relay module and multiple limit switches. The drive module is connected to the drain valve. Under the control of the first control terminal of the drive module, the drive module controls the valve to move from the zero position to the fully open position in a first direction. Under the control of the second control terminal of the drive module, the drive module controls the valve to move from the fully open position to the zero position in a second direction. When the valve is in the zero position, the drain valve is in a completely closed state. The relay module is connected to the drive module through the limit switches and is used to control the drive module to move the valve from the first direction to the intermediate position, or from the second direction to the intermediate position. In this way, the valve can return to the intermediate position from any position, solving the problem of drain volume control failure caused by the single control method when the valve can only return to the intermediate position from a fixed position. This avoids water waste and improves the control accuracy and operational reliability of the drain system.

[0024] Optionally, based on the above embodiments, Figure 2 This is a schematic diagram of the opening control device provided in an embodiment of the present invention. See also: Figure 2The multiple limit switches 40 include a first limit switch 410, a second limit switch 420, and a third limit switch 430. The first limit switch 410 is used to control the drive module 10 to stop working when the valve position is detected to be fully open; the second limit switch 420 is used to control the drive module 10 to stop working when the valve position is detected to be zero; and the third limit switch 430 is used to control the drive module 10 to stop working when the valve position is detected to be intermediate.

[0025] Specifically, such as Figure 2 As shown, the multiple limit switches 40 include a first limit switch 410, a second limit switch 420, and a third limit switch 430. The first limit switch 410 can be a fully open limit switch, and the corresponding first sensor can be set at the fully open position of the drain valve. When the first sensor detects that the valve is in the fully open position, the corresponding first limit switch 410 will disconnect from the first control terminal of the drive module 10, thereby stopping the drive module 10 and stopping the valve in the fully open position, making the drain valve 20 fully open. The second limit switch 420 can be a zero-position limit switch, and the corresponding second sensor can be set at the zero position of the drain valve. When the second sensor detects that the valve is in the zero position, the corresponding second limit switch 420 will disconnect from the second control terminal of the drive module 10, thereby stopping the drive module 10 and stopping the valve in the zero position, making the drain valve 20 fully closed. The third limit switch 430 can be an intermediate limit switch. The corresponding third sensor can be set in the middle position of the drain valve. When the third sensor detects that the valve is in the middle position, the corresponding third limit switch 430 will disconnect from the control terminal (first control terminal or second control terminal) of the drive module 10, thereby stopping the drive module 10 and stopping the valve in the middle, so that the drain valve 20 is in a half-open state. In this way, the operation of the drive module is controlled by the limit switch 40, thereby realizing the control of the stop position of the valve and ensuring the control accuracy of the opening control device.

[0026] Optionally, based on the above embodiments, see also... Figure 2 The relay module 30 includes multiple connection terminals and multiple relay units. The multiple connection terminals include an on control terminal 2, an off control terminal 3, a switching control terminal 9, a first power supply terminal 4, a second power supply terminal 5, and an intermediate command terminal 10.

[0027] Multiple relay units include a first relay unit, a second relay unit, and a third relay unit. The first relay unit includes a first relay body KA1 and a first normally open contact KA1-1. The second relay unit includes a second relay body KA2 and a first normally closed contact KA2-1. The third relay unit includes a third relay body KA3, a second normally open contact KA3-1, a third normally open contact KA3-2, and a second normally closed contact KA3-3. The first limit switch 410 has its first end connected to the opening control terminal 2, its second end connected to the first control terminal of the drive module 10, and its third end connected to the first power terminal 4. The first power terminal 4 is connected to the first relay body KA1. The second limit switch 420 has its first end connected to the closing control terminal 3, its second end connected to the second control terminal of the drive module 10, and its third end connected to the second power terminal 5. The second power terminal 5 is connected to the second relay body KA2. The first end of the third limit switch 430 is connected to the intermediate command terminal 10, the second end is connected to the switching control terminal 9, and the third end is connected to the circuit. The intermediate command terminal 10 is connected to the third relay body KA3. The first normally open contact KA1-1 and the first normally closed contact KA2-1 are connected in series between the intermediate command terminal 10 and the third relay body KA3. The second normally open contact KA3-1 is connected in parallel with the first normally open contact KA1-1. The switching control terminal 9 is connected to the opening control terminal 2 through the second normally closed contact KA3-2, and also to the closing control terminal 3 through the third normally open contact KA3-3.

[0028] Specifically, such as Figure 2As shown, the relay module 30 includes multiple connection terminals and multiple relay units. The drive module 10 is jointly controlled by the first limit switch 410, the second limit switch 420, the third limit switch 430, the multiple connection terminals, and the multiple relay units, thereby controlling the opening degree of the drain valve 20. The opening degree control process of the drain valve 20 includes a first opening degree control process and a second opening degree control process. The first opening degree control process can be a control process from the fully open position back to the intermediate position. For example, when the drain system sends an intermediate position enable command to the intermediate command terminal 10, the third limit switch 430 is enabled, and the opening degree control device begins to execute the return to the intermediate position operation. After detecting that the valve has moved to the fully open position, the first opening degree control process is performed. The first sensor detects that the valve is in the fully open position, and the first and third terminals of the corresponding first limit switch 410 are connected (i.e., the control terminal 2 and the first power terminal 4 are connected). The first relay body KA1 connected to the first power terminal 4 is energized, and the first normally open contact KA1-1 corresponding to the first relay body KA1 closes. Simultaneously, the first and second ends of the first limit switch 410 are closed (i.e., the control terminal 2 is disconnected from the first control terminal of the drive module 10). Furthermore, since the valve has not yet reached the zero position, the first and second ends of the second limit switch 420 are connected (i.e., the control terminal 3 is connected to the second control terminal of the drive module 10), and the first and third ends of the second limit switch 420 are disconnected (i.e., the control terminal 3 is disconnected from the second power terminal 5). Therefore, the second relay body KA2 connected to the second power terminal 5 is de-energized. The first normally closed contact KA2-1 corresponding to the second relay body KA2 remains closed, the first normally open contact KA1-1 closes, and the first normally closed contact KA2-1 closes, energizing the third relay body KA3. This energizes the third relay body KA3, which self-locks through the second normally open contact KA3-1, ensuring that the third relay body KA3 remains continuously energized. When energized, the switching control terminal 9 is connected to the closing control terminal 3 through the third normally open contact KA3-2, and disconnected from the opening control terminal 2 through the second normally closed contact KA3-3. With the first end of the second limit switch 420 connected to the second control end of the drive module 10, the drive module 10 drives the valve to move from the fully open position to the zero position in the second direction (closing direction). When the valve moves to the middle position, the first end of the third limit switch 430 is disconnected from the second end (the middle command terminal 10 and the switching control terminal 9 are disconnected, that is, the middle command terminal 10 and the closing control terminal 3 are disconnected). The second control end of the drive module 10 is disconnected to stop driving the valve, so that the drain valve is in a semi-closed state.

[0029] Similarly, the second opening control process can be a control process from zero position back to the intermediate position. For example, when the sewage system sends an intermediate position enable command to the intermediate command terminal 10, the third limit switch 430 is enabled, and the opening control device begins to execute the return-to-intermediate-position operation. After detecting that the valve has moved to the zero position, the second opening control process is performed. The first sensor detects that the valve is at the zero position, and the first and third terminals of the corresponding second limit switch 420 are connected (i.e., the control terminal 3 and the second power terminal 5 are connected). The second relay body KA2 connected to the second power terminal 5 is energized, and the first normally closed contact KA2-1 corresponding to the second relay body KA2 is opened. At the same time, the first and second terminals of the second limit switch 420 are closed (i.e., the control terminal 3 is disconnected from the second control terminal of the drive module 10). Furthermore, since the valve has not yet moved to the fully open position, the first and second ends of the first limit switch 410 are connected (i.e., the opening control terminal 2 is connected to the first control terminal of the drive module 10), and the first and third ends of the first limit switch 410 are disconnected (i.e., the opening control terminal 2 is disconnected from the first power terminal 4). Therefore, the first relay body KA1 connected to the first power terminal 4 is de-energized, and the first normally open contact KA1-1 corresponding to the first relay body KA1 is disconnected. Because the first normally closed contact KA2-1 is disconnected, the third relay body KA3 is de-energized and its self-locking is released. At this time, the switching control terminal 9 is activated through the third normally open contact... When KA3-2 is disconnected from the closing control terminal 3, the switching control terminal 9 is connected to the opening control terminal 2 through the second normally closed contact KA3-3. When the first end of the first limit switch 410 is connected to the first control end of the drive module 10, the drive module 10 drives the valve to move from the zero position to the fully open position in the first direction (opening direction). When the valve moves to the middle position, the first end of the third limit switch 430 is disconnected from the second end (the middle command terminal 10 and the switching control terminal 9 are disconnected, that is, the middle command terminal 10 and the opening control terminal 2 are disconnected). The first control end of the drive module 10 is disconnected to stop driving the valve, so that the drain valve is in a semi-closed state. As described above, this embodiment of the invention detects the extreme positions (zero or fully open) of the valve through the first limit switch 410 and the second limit switch 420, and transmits the signal to the relay module 30. By controlling the on / off state of the third relay body KA3, the connection target of the switching control terminal 9 (connecting to the open control terminal 2 or the closed control terminal 3) is dynamically controlled. Ultimately, after receiving the intermediate position control command, the intermediate command terminal 10 can run in the correct direction (such as from the zero position or from the fully open position), and the intermediate position is stopped by the third limit switch 430. This solves the problem of sewage discharge control failure caused by the single control when the valve can only return from a fixed position to the intermediate position, avoids water waste, and improves the control accuracy and operational reliability of the sewage system.

[0030] Optional, see below Figure 2 During the third opening control process, a control signal is sent to the opening control terminal 2, the first end of the first limit switch 410 and the first control end of the drive module 10 are connected, the drive module 10 drives the valve to move from the zero position to the fully open position in the first direction, and when it moves to the fully open position, the drive module 10 is controlled to stop working by the first limit switch 410.

[0031] Specifically, the third opening control process can be a fully open control process, that is, by controlling the valve to move from the zero position to the fully open position, the drain valve is switched from the fully closed state to the fully open state. For example, when it is necessary to fully open the drain valve, a control signal is sent to the opening control terminal 2. At this time, the first end of the first limit switch 410 and the first control end of the drive module 10 are connected. The drive module 10 rotates forward to control the valve to move from the zero position to the fully open position. When the valve moves to the fully open position, the first limit switch 410 is disconnected (the first end of the first limit switch 410 is disconnected from the second end, and the first end is connected to the third end), thereby controlling the drive module 10 to stop working.

[0032] Optionally, during the fourth opening control process, a control signal is sent to the closing control terminal 3, the first end of the second limit switch 420 and the second control end of the drive module 10 are connected, the drive module 10 drives the valve to move from the fully open position to the zero position in the second direction, and when it moves to the zero position, the drive module 10 is controlled to stop working by the second limit switch 420.

[0033] Specifically, the fourth opening control process can be a full-close control process, that is, by controlling the valve to move from the fully open position to the zero position, the drain valve is switched from the fully open state to the fully closed state. For example, when it is necessary to fully close the drain valve, a control signal is sent to the closing control terminal 3. At this time, the first end of the second limit switch 420 and the second control terminal of the drive module 10 are connected. The drive module 10 reverses to control the valve to move from the fully open position to the zero position. When it moves to the zero position, the second limit switch 420 is disconnected (the first end of the first limit switch 410 is disconnected from the second end, and the first end is connected to the third end), thereby controlling the drive module 10 to stop working. In this way, the full opening and closing control of the drain valve is achieved through the first limit switch 410 and the second limit switch 420, ensuring a simple control method for the drain valve.

[0034] Optionally, based on the above embodiments, see also... Figure 2The sewage system also includes a boiler (not shown in the figure) and a conductivity detection device (not shown in the figure). The sewage valve is installed on the boiler, and the conductivity detection device is installed inside the boiler to detect the conductivity of the liquid inside the boiler. The conductivity detection device is connected to both the boiler and the relay module. When the conductivity is detected to be within a first preset range (the first preset range is greater than the second and third preset ranges), it indicates that the conductivity of the liquid inside the boiler is high, and the liquid needs to be discharged to reduce the conductivity. A first enable signal is then sent to the opening control terminal 2, controlling the valve to move from the zero position to the fully open position, thus switching the sewage valve from the fully closed state to the fully open state, thereby performing the third opening control process. When the conductivity is detected to be within the second preset range (the second preset range is less than the third preset range), the system continues to operate. When the conductivity is greater than the first preset range, it indicates that the conductivity of the liquid inside the boiler is normal. A second enable signal is sent to the switching control terminal 9 to initiate either the first or second opening control process, thereby controlling the drain valve to be in a semi-open state. When the conductivity is detected to be within the third preset range (less than the first and second preset ranges), it indicates that the conductivity of the liquid inside the boiler is low. A third enable signal is sent to the closing control terminal 3, controlling the valve to move from the fully open position to the zero position, thus switching the drain valve from the fully open state to the fully closed state for the fourth opening control process. In this way, the conductivity of the liquid inside the boiler is used to enable signals for the opening control terminal 2, closing control terminal 3, and switching control terminal 9, thereby ensuring that the conductivity of the liquid inside the boiler is normal and avoiding waste of water resources.

[0035] It should be noted that during the third or fourth opening control process, the control of the third limit switch 430 fails. That is, during the fully open and fully closed control processes, the opening control terminal is enabled and the closing control terminal is enabled, respectively. However, the switching control terminal does not have an enable signal. Therefore, the control of the third limit switch 430 fails, thereby preventing the control of the intermediate position from affecting the control of the fully open and fully closed processes, and improving the reliability of the opening control device.

[0036] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An opening degree control device based on a sewage discharge system, characterized in that, The sewage system includes a drive module and a sewage valve; the opening control device includes a relay module and multiple limit switches. The drive module is connected to the drain valve. Under the control of the first control terminal of the drive module, the drive module controls the valve to move from the zero position to the fully open position in the first direction. Under the control of the second control terminal of the drive module, the drive module controls the valve to move from the fully open position to the zero position in the second direction. When the valve is in the fully open position, the drain valve is in a fully open state. When the valve is in the zero position, the drain valve is in a fully closed state. The relay module is connected to the drive module through the limit switch and is used to control the drive module to drive the valve to move from a first direction to the middle position, or from a second direction to the middle position. When the valve is in the middle position, the drain valve is in a semi-open state.

2. The opening control device according to claim 1, characterized in that, The plurality of limit switches include a first limit switch, a second limit switch, and a third limit switch; The first limit switch is used to control the drive module to stop working when the valve is detected to be in the fully open position; the second limit switch is used to control the drive module to stop working when the valve is detected to be in the zero position; and the third limit switch is used to control the drive module to stop working when the valve is detected to be in the intermediate position.

3. The opening control device according to claim 2, characterized in that, The relay module includes multiple connection terminals and multiple relay units; The plurality of connection terminals include an on control terminal, an off control terminal, a switching control terminal, a first power terminal, a second power terminal, and an intermediate command terminal; The plurality of relay units include a first relay unit, a second relay unit, and a third relay unit. The first relay unit includes a first relay body and a first normally open contact. The second relay unit includes a second relay body and a first normally closed contact. The third relay unit includes a third relay body, a second normally open contact, a third normally open contact, and a second normally closed contact. The first end of the first limit switch is connected to the opening control terminal, the second end is connected to the first control terminal of the drive module, and the third end is connected to the first power terminal. The first power terminal is connected to the first relay body. The first end of the second limit switch is connected to the closing control terminal, the second end is connected to the second control terminal of the drive module, the third end is connected to the second power terminal, and the second power terminal is connected to the second relay body. The first end of the third limit switch is connected to the intermediate command terminal, the second end is connected to the switching control terminal, and the third end is connected to the circuit. The intermediate command terminal is connected to the third relay body. The first normally open contact and the first normally closed contact are connected in series between the intermediate command terminal and the third relay body. The second normally open contact and the first normally open contact are connected in parallel. The switching control terminal is connected to the opening control terminal through the second normally closed contact and also to the closing control terminal through the third normally open contact.

4. The opening control device according to claim 3, characterized in that, During the first opening control process, after the valve moves to the fully open position, the first and third ends of the first limit switch are connected, and the first and second ends are disconnected. The first and second ends of the second limit switch are connected, and the first and third ends are disconnected, so that the first relay body is energized, the second relay body is de-energized, and the third relay body is energized and self-locked, so that the switching control terminal is connected to the closing control terminal through the third normally open contact. Then, the first end of the second limit switch is connected to the second control terminal of the drive module to drive the valve to move from the fully open position to the zero position in the second direction. When it moves to the intermediate position, the drive module is stopped by the third limit switch.

5. The opening control device according to claim 3, characterized in that, During the second opening control process, after the valve moves to the zero position, the first and third ends of the second limit switch are connected, and the first and second ends are disconnected. The first and second ends of the first limit switch are connected, and the first and third ends are disconnected, so that the second relay body is energized, the first relay body is de-energized, and the third relay body is de-energized, so that the switching control terminal is connected to the opening control terminal through the second normally closed contact. Then, the first end of the first limit switch is connected to the first control terminal of the drive module to drive the valve to move from the zero position to the fully open position in the first direction. When it moves to the intermediate position, the drive module is stopped by the third limit switch.

6. The opening control device according to claim 3, characterized in that, During the third opening control process, a control signal is sent to the opening control terminal, the first end of the first limit switch and the first control end of the drive module are connected, the drive module drives the valve to move from the zero position to the fully open position in the first direction, and when it moves to the fully open position, the drive module is controlled to stop working by the first limit switch.

7. The opening control device according to claim 3, characterized in that, During the fourth opening control process, a control signal is sent to the closing control terminal, the first end of the second limit switch and the second control terminal of the drive module are connected, the drive module drives the valve to move from the fully open position to the zero position in the second direction, and when it moves to the zero position, the drive module is controlled to stop working by the second limit switch.

8. The opening control device according to claim 3, characterized in that, The sewage discharge system also includes a boiler and a conductivity detection device. The conductivity detection device is connected to the boiler and the relay module respectively, and is used to detect the conductivity of the liquid in the boiler. When the conductivity is detected to be within a first preset range, a first enable signal is sent to the opening control terminal to perform a third opening control process. When the conductivity is detected to be within a second preset range, a second enable signal is sent to the switching control terminal to perform a first opening control process or a second opening control process. When the conductivity is detected to be within a third preset range, a third enable signal is sent to the closing control terminal to perform a fourth opening control process.

9. The opening control device according to claim 8, characterized in that, During the third or fourth opening control process, the control of the third limit switch fails.

10. The opening control device according to claim 1, characterized in that, The drive module includes a drive device and a motor. The drive device is connected to the motor, and the motor is connected to the valve. The drive device is used to drive the motor to rotate forward so as to move the valve from the zero position to the fully open position in a first direction. The drive device is also used to drive the motor to rotate in reverse so as to move the valve from the fully open position to the zero position in a second direction.

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