Valve positioner

Abstract

The utility model relates to the technical field of positioners, and discloses a valve positioner which comprises a working part and a backup part, the working part and the backup part comprise a plurality of identical elements, the working part is connected with an executing mechanism of a regulating valve and used for controlling the executing mechanism so as to control the valve opening degree of the regulating valve, and the backup part is connected with the executing mechanism and used for controlling the valve opening degree of the regulating valve. The control module is used for replacing at least one part of the working part through at least one part of the backup part if it is detected that at least one part of the working part breaks down so as to control the executing mechanism and control the valve opening degree of the adjusting valve, and when the working part of the valve positioner breaks down, the backup part replaces the working part to work so as to control the valve opening degree of the adjusting valve. And normal production is not influenced.

Description

Technical Field

[0001] The present application relates to the technical field of positioners, and in particular to a valve positioner. Background Art

[0002] Intelligent valve positioners, essential field control instruments in industries like petrochemicals, play a key role as core accessories for control valves. They typically operate in conjunction with pneumatic control valves to precisely control industrial processes. Their core function is to receive commands from a central control system and, through sophisticated calculations and control mechanisms, accurately adjust valve openings, thereby ensuring process stability and efficiency.

[0003] The control mechanism of an intelligent valve positioner is based on a closed-loop control principle. Its internal structure primarily consists of core components such as the sensor, mainboard, and I / P unit (electrical converter). The sensor monitors the valve stem position in real time and transmits the measured data to the mainboard for processing. The mainboard uses an analog-to-digital converter (AD) module to simultaneously collect valve position data from the valve position sensor and control commands from the central control system. The AD module converts the two into percentages for comparison. Based on the comparison, the I / P unit determines whether to initiate an intake or exhaust operation. Furthermore, the mainboard integrates a key module, display module, valve position feedback module, and communication module to implement functions such as human-machine interaction, status display, and communication. The I / P unit converts the electrical signals from the mainboard into pneumatic signals, directly driving the actuator to perform intake, exhaust, or hold operations, thereby moving the valve stem and adjusting the valve opening.

[0004] However, traditional intelligent valve positioners have limitations in their design, especially their core components such as control motherboards, position sensors and I / P units, which often adopt a single configuration and lack redundant design. This design significantly increases the risk of component failure when facing extreme working environments such as high temperature, strong vibration, and corrosive media. Once these key components fail, it will lead to abnormal control of the control valve, and in severe cases, the intelligent valve positioner may even need to be replaced as a whole. In industries such as petrochemicals and chemicals that have extremely high requirements for the safety of control valve pipeline control, this potential failure risk is unacceptable because it may directly threaten production safety, product quality and environmental protection. In view of this, the applicant has proposed a new valve positioner.

[0005] It should be noted that the above content only provides background technical information related to this application and does not necessarily constitute prior art. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the present application provides a valve positioner. When a working component in the valve positioner fails, a backup component can replace the working component to work without affecting normal production.

[0007] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0008] According to one aspect of an embodiment of the present application, a valve positioner is provided, comprising a working component and a backup component, wherein the working component and the backup component comprise a plurality of identical elements; the working component is connected to an actuator of a regulating valve and is used to control the actuator to control the valve opening of the regulating valve; the backup component is connected to the actuator and is used to replace at least a portion of the working component with at least a portion of the backup component to control the actuator and the valve opening of the regulating valve if a failure of at least a portion of the working component is detected.

[0009] In one embodiment of the present application, based on the aforementioned solution, the working component includes a first mainboard, a first position sensor and a first I / P unit, and the backup component includes a second mainboard, a second position sensor and a second I / P unit.

[0010] In one embodiment of the present application, based on the aforementioned scheme, the first position sensor is connected to the first main board, and the first position sensor is used to measure the valve stem position of the regulating valve to obtain first valve position data; the first main board is connected to the first I / P unit, and the first main board is used to collect the first valve position data to obtain a first actual valve position percentage, and generate a first control instruction based on a comparison result of the first actual valve position percentage and a preset expected valve position percentage; the first I / P unit controls the actuator to perform intake, exhaust or holding operations according to the first control instruction to control the valve opening of the regulating valve.

[0011] In one embodiment of the present application, based on the aforementioned scheme, the second position sensor is connected to the second main board, and the second position sensor is used to measure the valve stem position of the regulating valve to obtain second valve position data; the second main board is connected to the second I / P unit, and the second main board is used to collect the second valve position data to obtain a second actual valve position percentage, so that when at least a part of the working component fails, the second main board generates a second control instruction based on the comparison result of the second actual valve position percentage and the preset expected valve position percentage, and then controls the second I / P unit to execute the second control instruction.

[0012] In one embodiment of the present application, based on the aforementioned scheme, the first main board is communicatively connected to the second main board to transmit communication data; the first position sensor is connected to the second main board, and the first I / P unit is connected to the second main board, so that when the first main board fails, the first main board can be replaced by at least the second main board; the second position sensor is connected to the first main board, and the second I / P unit is connected to the first main board, so that when the second main board fails, the second main board can be replaced by at least the first main board.

[0013] In one embodiment of the present application, based on the aforementioned scheme, the second main board compares the first valve position data collected by the first position sensor with the preset valve position range. If it is outside the preset valve position range, it is determined that the first position sensor has failed; the second main board obtains the input current, current temperature and stored data of the first main board. If at least one of the input current exceeds the preset current range, the current temperature exceeds the preset temperature range and the stored data verification fails, it is determined that the first main board has failed; the second main board obtains the adjustment time of the first I / P unit. If the adjustment time is greater than the preset time threshold, it is determined that the first I / P unit has failed.

[0014] In one embodiment of the present application, based on the aforementioned scheme, the first main board compares the first valve position data collected by the first position sensor with a preset valve position range. If it is outside the preset valve position range, it is determined that the first position sensor has failed; the first main board obtains the input current, current temperature and stored data of the first main board. If at least one of the input current exceeds the preset current range, the current temperature exceeds the preset temperature range and the stored data verification fails, it is determined that the first main board has failed; the first main board obtains the adjustment time of the first I / P unit. If the adjustment time is greater than the preset time threshold, it is determined that the first I / P unit has failed.

[0015] In one embodiment of the present application, based on the aforementioned solution, the valve positioner further includes a human-computer interaction module, which is communicatively connected to the first main board and / or the second main board, and is used to display the first actual valve position percentage and / or the second actual valve position percentage; the human-computer interaction module is used to receive a switching instruction input by a user, and switch the working components according to the switching instruction, the working components including the working components and the backup components; the human-computer interaction module is also used to display the status of the valve positioner to prompt the user.

[0016] In one embodiment of the present application, based on the above solution, the first position sensor and the second position sensor are position sensors of the same type or position sensors of different types.

[0017] In one embodiment of the present application, based on the above solution, the first position sensor and the second position sensor are contact potentiometer position sensors and / or non-contact magnetic induction position sensors.

[0018] Beneficial effects of the present application: The present application provides a valve positioner, comprising a working part and a backup part, the working part and the backup part comprising a plurality of identical elements, the working part being connected to the actuator of the regulating valve and being used to control the actuator to control the valve opening of the regulating valve, the backup part being connected to the actuator and being used to replace at least a part of the working part with at least a part of the backup part to control the actuator and the valve opening of the regulating valve if a failure is detected in at least a part of the working part, when the working part of the valve positioner fails, the backup part replaces the working part to work without affecting normal production.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present application and, together with the specification, serving to explain the principles of the present application. It is obvious that the drawings described below are merely some embodiments of the present application, and a person of ordinary skill in the art can derive other drawings based on these drawings without inventive effort. In the drawings:

[0021] Figure 1 1 is a schematic structural diagram of a regulating valve shown in an exemplary embodiment;

[0022] Figure 2 This is a functional block diagram of a valve positioner according to an exemplary embodiment;

[0023] Figure 3 FIG. 1 is a structural diagram of a valve positioner according to an exemplary embodiment of the present application.

[0024] Description of reference numerals:

[0025] 1: Mainboard 1, 2: Mainboard 2, 3: I / P unit 1, 4: I / P unit 2, 5: Position sensor 1, 6: Position sensor 2, 7: Air source interface, 8: Pressure output interface, 9: Control valve, 10: Mainboard 1 signal source, 11: Mainboard 1 current feedback, 12: Mainboard 2 signal source, 13: Mainboard 2 current feedback, 14: Human-computer interaction module. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention.

[0027] It should be noted that the diagrams provided in this embodiment are only used to illustrate the basic concept of the present invention. Therefore, the diagrams only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. The type, quantity and proportion of each component in actual implementation can be changed at will, and the component layout type may also be more complex. The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read. They are not used to limit the conditions for the implementation of the present invention, so they have no technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the effect and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0028] The valve positioner's control of the valve opening is a closed-loop control, such as Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a regulating valve, illustrating an exemplary embodiment. The valve positioner primarily consists of a sensor, a mainboard, and an I / P unit. The sensor primarily measures the valve stem position in real time and transmits the measured data to the mainboard for acquisition. The mainboard primarily uses the A / D module to collect valve position data from the valve position sensor and control command data from the central control system (central control system). The control command data includes the desired valve position data. Both data are converted into percentages to obtain the current actual valve position percentage and the desired valve position percentage. By comparing the current actual valve position percentage with the desired valve position percentage, the I / P unit determines whether air needs to be introduced or exhausted. Of course, the mainboard typically also includes a key module, a display module, a valve position feedback module, and a communication module. The I / P unit primarily accepts control from the mainboard, converting electrical signals into pneumatic signals to control the actuator's intake, exhaust, or hold operation. When air is introduced or exhausted within the actuator, it pushes the valve stem downward or upward, decreasing or increasing the valve opening, driving changes in the valve position sensor data.

[0029] Figure 2 This is a functional block diagram of a valve positioner according to an exemplary embodiment. Figure 2 As shown in the figure, the intelligent valve positioner is a pneumatic control instrument that requires an external air source input. The DCS system (Distributed Control System, also known as a distributed control system) control controller inputs a 4-20mA current to the intelligent valve positioner to control the valve opening. The intelligent valve positioner MCU (Microcontroller Unit) collects the 4-20mA current through the A / D module, obtains the control command, and converts and calculates the input signal percentage, that is, the desired valve position percentage. At the same time, the MCU collects the valve position travel sensor data, that is, the valve position data, through the A / D module and converts and calculates the current actual valve position percentage. By comparing the input signal percentage with the current actual valve position percentage, the MCU controls the I / P unit to perform the advance, exhaust, or hold operation, affecting the pressure in the actuator, thereby controlling the valve opening. The MCU converts the current actual valve position percentage into a 4-20mA current output through the current feedback module and feeds it back to the DCS system. The pressure sensor mainly measures the air source pressure and output pressure.

[0030] In one embodiment of the present application, a valve positioner includes a working component and a backup component, and the working component and the backup component include multiple identical elements; the working component is connected to an actuator of a regulating valve and is used to control the actuator to control the valve opening of the regulating valve; the backup component is connected to the actuator and is used to replace at least a portion of the working component with at least a portion of the backup component if a failure of at least a portion of the working component is detected, so as to control the actuator and control the valve opening of the regulating valve.

[0031] In one embodiment of the present application, the working component includes a first main board, a first position sensor, and a first I / P unit, and the backup component includes a second main board, a second position sensor, and a second I / P unit.

[0032] Figure 3 This is a schematic diagram of the structure of a valve positioner shown in an exemplary embodiment of the present application. It should be noted that: Figure 3 This is only a structural diagram of the valve positioner shown in this application, and is presented as an example. It should not bring any restrictions on the composition, connection, etc. of the valve positioner of this application, nor should it bring any restrictions on the functions and scope of use of the embodiments of this application. In fact, there may be other structures, and please refer to the text description for details. Figure 3As shown, the working components include a main board 1, an I / P unit 1, and a position sensor 1, and the backup components include a main board 2, an I / P unit 2, and a position sensor 2. It should be noted that the valve positioner main boards 1 and 2 of the present application have all the functions of a common intelligent valve positioner main board, including an input current acquisition module, a position sensor acquisition module, a current feedback module, a communication module, a data storage module, an IP unit control module, an air source pressure acquisition module, an output pressure acquisition module, etc. The intelligent valve positioner in the present application is a type of valve positioner. Here, the main boards 1 and 2 of the present application have the same structure as the valve positioner main boards in the prior art, such as the main board in the HVP intelligent valve positioner. The difference is that the valve positioner in the present application is designed with a redundant structure.

[0033] In one embodiment of the present application, a first position sensor is connected to a first mainboard and is used to measure the valve stem position of a control valve to obtain first valve position data. The first mainboard is connected to a first I / P unit and is used to collect the first valve position data, calculate a first actual valve position percentage based on the first valve position data, and generate a first control instruction based on a comparison result of the first actual valve position percentage and a preset desired valve position percentage. The first I / P unit controls the actuator to perform an intake, exhaust, or hold operation based on the first control instruction to control the valve opening of the control valve. The above calculation is a simple percentage conversion and does not involve a new computer program.

[0034] In this embodiment, continue to refer to Figure 3 As shown, when the valve positioner is in normal operation, the air source is provided to the positioner through the air source interface (7), and the pressure output interface (8) is connected to the actuator of the regulating valve (9); the main board 1 (1) collects the first valve position data of the position sensor 1 (5) and the command data input by the main board 1 signal source (10), namely the control command data, wherein the control command data includes the expected valve position data, and the first valve position data and the expected valve position data are respectively converted to obtain the first actual valve position percentage and the expected valve position percentage, and a first control instruction is generated based on the comparison result of the first actual valve position percentage and the expected valve position percentage, and the I / P unit 1 (3) is controlled according to the first control instruction to perform intake, exhaust or maintenance to adjust the valve position, and the first actual valve position percentage is fed back to the upper layer system, namely the central control system, through the main board 1 current feedback (11).

[0035] In one embodiment of the present application, a second position sensor is connected to a second mainboard and is used to measure the valve stem position of the regulating valve to obtain second valve position data. The second mainboard is also connected to a second I / P unit and is used to collect the second valve position data and calculate a second actual valve position percentage based on the second valve position data. When at least a portion of the working component fails, the second mainboard generates a second control instruction based on a comparison result of the second actual valve position percentage and a preset expected valve position percentage, thereby controlling the second I / P unit to execute the second control instruction. The above calculation is a simple percentage conversion and does not involve a new computer program.

[0036] In this embodiment, continue to refer to Figure 3 As shown, when the valve positioner is working normally, the main board 2 (2), the I / P unit 2 (4), and the position sensor 2 (6) are in a hot backup state. The main board 2 (2) collects the second valve position data of the position sensor 2 (6), and calculates the second actual valve position percentage based on the second valve position data. The second actual valve position percentage is fed back to the upper layer system through the main board 2 current feedback (13). The system receives two sets of feedback signals, namely the valve positioner main board 1 current feedback (11) and the main board 2 current feedback (13), and controls the I / P unit 2 (4) to be in a holding state.

[0037] In one embodiment of the present application, the first main board is communicatively connected to the second main board to transmit communication data; the first position sensor is connected to the second main board, and the first I / P unit is connected to the second main board, so that when the first main board fails, the first main board can be replaced by at least the second main board; the second position sensor is connected to the first main board, and the second I / P unit is connected to the first main board, so that when the second main board fails, the second main board can be replaced by at least the first main board.

[0038] In this embodiment, referring to Figure 3 As shown, the main board 1 (1) is connected to the main board 2 (2) for communication and data transmission; the main board 1 (1) is connected to the I / P unit 1 (3), the I / P unit 2 (4), the position sensor 1 (5) and the position sensor 2 (6); the main board 2 (2) is connected to the I / P unit 1 (3), the I / P unit 2 (4), the position sensor 1 (5) and the position sensor 2 (6); the I / P unit 1 (3) and the I / P unit 2 (4) are connected to the actuator of the regulating valve (9) through the pressure output interface (8), so that when one or more of the main board 1 (1), the position sensor 1 (5) and the IP unit 1 (3) fail, the valve positioner can enter the backup control state, that is, the opening of the regulating valve is controlled by one or more of the backup components of the main board 2 (2), the IP unit 2 (4) and the position sensor 2 (6), so as not to affect normal production.

[0039] In this embodiment, at least a part of the working components that have failed is determined to be a failed component, and the failed component includes at least one of the first main board, the first position sensor and the first I / P unit. The failed component can be replaced by the corresponding component of the failed component, or the same component thereof can be replaced by the corresponding component and other components together. The corresponding component includes at least one of the second main board, the second position sensor and the second I / P unit, and the other components are components in the backup component except the corresponding component. For example, when position sensor 1(5) fails, position sensor 2(6) can be used to replace position sensor 1(5), i.e., the main board 1(1), position sensor 2(6) and IP unit 1(3) can be used to control the opening of the regulating valve. Alternatively, position sensor 2(6) and main board 2(2) can be used to replace position sensor 1(5) and main board 1(1), i.e., the main board 2(2), IP unit 1(3) and position sensor 2(6) can be used to control the opening of the regulating valve. Alternatively, position sensor 2(6) and I / P unit 2(4) can be used to replace position sensor 1(5) and I / P unit 1(3), i.e., the main board 1(1), IP unit 2(4) and position sensor 2(6) can be used to replace main board 1(1), position sensor 1(5) and IP unit 1(3), i.e., the main board 2(2), IP unit 2(4) and position sensor 2(6) can be used to control the opening of the regulating valve. Other situations are similar and will not be described here. The specific replacement method can be determined according to a preset replacement scheme. For example, the preset replacement scheme is set to replace the faulty component with a corresponding component of the faulty component.

[0040] In another embodiment, referring to Figure 3 The module in the figure indicates that the following connection methods can also be used: the main board 1 (1) is connected to the main board 2 (2) in communication, the main board 1 (1) is connected to the I / P unit 1 (3), the I / P unit 2 (4) and the position sensor 1 (5), the main board 2 (2) is connected to the I / P unit 1 (3), the I / P unit 2 (4) and the position sensor 2 (6), and the I / P unit 1 (3) and the I / P unit 2 (4) are connected to the actuator of the regulating valve (9) through the pressure output interface (8), so that when one or more of the circuit main board 1 (1), the position sensor 1 (5) and the IP unit 1 (3) fails, the valve positioner can enter the backup control state, that is, the main board 2 (2), the IP unit 2 (4) and the position sensor 2 (6) of the backup component control the opening of the regulating valve, thereby not affecting normal production. It should be noted that this embodiment is only an example of a connection method and should not bring any limitation to the function and scope of use of the embodiment of the present application.

[0041] In one embodiment of the present application, the first main board and / or the second main board generates a test control command at a preset interval, and controls the backup component to control the actuator according to the test control command to control the valve opening of the regulating valve.

[0042] In this embodiment, in order to ensure that the main board 2 (2) and the IP unit 2 (4) can work normally when they enter the working state from the backup state, the valve positioner can configure the circuit main board 1 (1) or the main board 2 (2) through the menu to test the intake, exhaust and maintenance operation of the IP unit 2 (4) at certain intervals.

[0043] In one embodiment of the present application, the second main board compares the first valve position data collected by the first position sensor with a preset valve position range. If the data is outside the preset valve position range, the first position sensor is determined to be faulty. The second main board obtains the input current, current temperature and stored data of the first main board. If at least one of the input current exceeds the preset current range, the current temperature exceeds the preset temperature range and the stored data verification fails, the first main board is determined to be faulty. The second main board obtains the adjustment time of the first I / P unit. If the adjustment time is greater than the preset time threshold, the first I / P unit is determined to be faulty.

[0044] In one embodiment of the present application, the first main board compares the first valve position data collected by the first position sensor with a preset valve position range. If the data is outside the preset valve position range, the first position sensor is determined to be faulty. The first main board obtains the input current, current temperature and stored data of the first main board. If at least one of the input current exceeds the preset current range, the current temperature exceeds the preset temperature range and the stored data verification fails, the first main board is determined to be faulty. The first main board obtains the adjustment time of the first I / P unit. If the adjustment time is greater than the preset time threshold, the first I / P unit is determined to be faulty.

[0045] In this embodiment, the first mainboard or the second mainboard determines whether the first position sensor has failed by determining whether the acquisition code value of the first position sensor is within a specified reasonable range. The first mainboard or the second mainboard detects whether the first I / P unit has not adjusted the valve position to the desired position within a preset time. If the adjustment time exceeds a preset time threshold, the first I / P unit is determined to have failed. The first mainboard or the second mainboard obtains the input current, current temperature, and stored data of the first mainboard, determines whether the acquisition code value of the input current is within a preset current range, whether the current temperature is within a preset temperature range, and performs data verification on the data in the memory to determine whether the stored data verification is successful. If at least one of the following conditions is met: the input current exceeds the preset current range, the current temperature exceeds the preset temperature range, or the stored data verification fails, the first mainboard is determined to have failed. In this embodiment, the data verification may be a CRC (Cyclic Redundancy Check).

[0046] It should be noted that in this application, when the mainboard judges the fault of each component, it can determine whether it is a fault by comparing the parameters of the acquisition component with the preset threshold value. No new computer program is involved in the mainboard, and the comparison and judgment process can be replaced by hardware, such as digital comparators, hardware comparators, comparator chips, and amplifiers with comparison functions, etc., which will not be repeated here.

[0047] In one embodiment of the present application, the valve positioner also includes a human-computer interaction module, which is communicatively connected to the first main board and / or the second main board, and is used to display the first actual valve position percentage and / or the second actual valve position percentage; the human-computer interaction module is used to receive a switching instruction input by the user, and switch the working components according to the switching instruction, and the working components include working components and backup components; the human-computer interaction module is also used to display the status of the valve positioner to prompt the user.

[0048] In this embodiment, continue to refer to Figure 3 As shown, the human-machine interaction module (14) is connected to the main board 1 (1) and the main board 2 (2) in communication, and displays the current valve position percentage of the main board 1 (1) and the main board 2 (2), i.e., the first actual valve position percentage and the second actual valve position percentage, on the display; a test switch is provided on the human-machine interaction module (14), and when the working status of the equipment needs to be tested, the control of the main board 1 (1) or the control of the main board 2 (2) can be switched; a number of LED indicators are provided on the human-machine interaction module (14) to indicate the current status of the valve positioner, so that the user can conduct inspections and know whether the valve positioner has a fault. Among them, the human-machine interaction module (14) is an optional module, that is, the human-machine interaction module (14) can be configured or not configured according to needs.

[0049] In one embodiment of the present application, the first position sensor and the second position sensor are the same type of position sensors or different types of position sensors; the first position sensor and the second position sensor are contact potentiometer position sensors and / or non-contact magnetic induction position sensors.

[0050] In this embodiment, continue to refer to Figure 3 , position sensor 1 (5) and position sensor 2 (6) can be contact potentiometer position sensors or non-contact magnetic induction position sensors; position sensor 1 (5) and position sensor 2 (6) can be the same type of position sensors or different types of position sensors.

[0051] This application innovatively designs redundant components of the traditional intelligent valve positioner, including the control motherboard, position sensor, and IP unit. During normal operation, one group of components is in working state, and another group of components is in hot backup state. When a system failure occurs, the system can be switched to the backup component working state without interruption, without affecting normal production.

[0052] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A valve positioner, characterized in that: The method comprises a working part and a backup part, wherein the working part and the backup part comprise a plurality of identical elements; The working component is connected to the actuator of the regulating valve and is used to control the actuator to control the valve opening of the regulating valve; The backup component is connected to the actuator and is used to control the actuator and the valve opening of the regulating valve by replacing at least a part of the working component with at least a part of the backup component if a failure is detected in at least a part of the working component.

2. The valve positioner according to claim 1, characterized in that: The working component includes a first main board, a first position sensor, and a first I / P unit, and the backup component includes a second main board, a second position sensor, and a second I / P unit.

3. The valve positioner according to claim 2, characterized in that: The first position sensor is connected to the first mainboard, and is used to measure the valve stem position of the regulating valve to obtain first valve position data; The first mainboard is connected to the first I / P unit, and is configured to collect the first valve position data to obtain a first actual valve position percentage, and generate a first control instruction based on a comparison result of the first actual valve position percentage and a preset expected valve position percentage; The first I / P unit controls the actuator to perform intake, exhaust or holding operation according to the first control instruction to control the valve opening of the regulating valve.

4. The valve positioner according to claim 2, characterized in that: The second position sensor is connected to the second main board, and is used to measure the valve stem position of the regulating valve to obtain second valve position data; The second main board is connected to the second I / P unit. The second main board is used to collect the second valve position data to obtain a second actual valve position percentage so that when at least part of the working component fails, the second main board generates a second control instruction based on the comparison result of the second actual valve position percentage and the preset expected valve position percentage, and then controls the second I / P unit to execute the second control instruction.

5. The valve positioner according to claim 2, characterized in that: The first mainboard is communicatively connected to the second mainboard to transmit communication data; The first position sensor is connected to the second mainboard, and the first I / P unit is connected to the second mainboard, so that when the first mainboard fails, the first mainboard can be replaced by at least the second mainboard; The second position sensor is connected to the first mainboard, and the second I / P unit is connected to the first mainboard, so that when the second mainboard fails, the second mainboard can be replaced by at least the first mainboard.

6. The valve positioner according to any one of claims 1 to 5, characterized in that: The second mainboard compares the first valve position data collected by the first position sensor with a preset valve position range, and determines that the first position sensor is faulty if the data is outside the preset valve position range; The second mainboard obtains the input current, current temperature, and stored data of the first mainboard, and determines that the first mainboard has failed if at least one of the following conditions is met: the input current exceeds a preset current range, the current temperature exceeds a preset temperature range, and the stored data fails to be verified; The second mainboard obtains an adjustment time of the first I / P unit, and determines that the first I / P unit fails if the adjustment time is greater than a preset time threshold.

7. The valve positioner according to any one of claims 1 to 5, characterized in that: The first mainboard compares the first valve position data collected by the first position sensor with a preset valve position range, and determines that the first position sensor is faulty if the data is outside the preset valve position range; The first mainboard obtains an input current, a current temperature, and stored data of the first mainboard, and determines that the first mainboard has failed if at least one of the following conditions is met: the input current exceeds a preset current range, the current temperature exceeds a preset temperature range, and a data verification of the stored data fails; The first mainboard obtains an adjustment time of the first I / P unit, and determines that the first I / P unit fails if the adjustment time is greater than a preset time threshold.

8. The valve positioner according to any one of claims 1 to 5, characterized in that: The valve positioner further includes a human-computer interaction module, the human-computer interaction module being communicatively connected to the first main board and / or the second main board, the human-computer interaction module being configured to display the first actual valve position percentage and / or the second actual valve position percentage; The human-computer interaction module is used to receive a switching instruction input by a user and switch the working components according to the switching instruction, wherein the working components include the working component and the backup component; The human-computer interaction module is also used to display the status of the valve positioner to prompt the user.

9. The valve positioner according to any one of claims 1 to 5, characterized in that: The first position sensor and the second position sensor are position sensors of the same type or position sensors of different types.

10. The valve positioner according to any one of claims 1 to 5, characterized in that: The first position sensor and the second position sensor are contact potentiometer position sensors and / or non-contact magnetic induction position sensors.

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