A detection system for an electrically powered ball valve

Abstract

The application discloses a detection system of an electric ball valve, and relates to the technical field of valve detection. The electric ball valve applied by the detection system comprises an electric actuator, a valve rod and a valve, the electric actuator is in transmission connection with the valve rod, and the valve rod is connected with the valve. The detection system comprises a plurality of sensors, a voltage detector, a current detector, an acquisition box and an upper computer, the acquisition box is connected with the voltage detector, the current detector and the plurality of sensors, and the upper computer is connected with the acquisition box. The plurality of sensors are arranged on the valve rod and are used for detecting the torque of the valve rod and the rotation angle of the valve rod. The voltage detector is used for detecting the working voltage of the electric actuator, and the current detector is used for detecting the working current of the electric actuator. The acquisition box collects the detection data of the sensors, the voltage detector and the current detector, and transmits the collected data to the upper computer. Through the detection system, the real-time data of the electric ball valve during operation can be detected, and the real-time state of the electric ball valve can be monitored.

Description

Technical Field

[0001] This disclosure relates to the field of valve testing technology, and in particular to a testing system for an electric ball valve. Background Technology

[0002] Electric ball valves, as crucial components for pipeline fluid control, are widely used in systems such as oil and gas, chemical and pharmaceutical, and energy and power. The normal operation of electric ball valves is essential for the safe and reliable operation of equipment. The on / off state of the valve and the operational reliability of the actuator directly affect the safety and efficiency of the entire production system.

[0003] In existing solutions, the status monitoring of electric ball valves mainly relies on manual inspections or periodic maintenance, lacking real-time monitoring, which may lead to potential faults not being detected in a timely manner. Summary of the Invention

[0004] The purpose of this disclosure is to provide a detection system for electric ball valves, which can realize real-time monitoring of the status of electric ball valves.

[0005] This application provides a testing system for an electric ball valve. The electric ball valve includes an electric actuator, a valve stem, and a valve. The electric actuator is drivenly connected to the valve stem, and the valve stem is connected to the valve. The testing system includes:

[0006] Multiple sensors are mounted on the valve stem to detect the valve stem torque and the valve stem rotation angle.

[0007] A voltage detector, connected to the electric actuator, is used to detect the operating voltage of the electric actuator.

[0008] A current detector, connected to an electric actuator, is used to detect the operating current of the electric actuator.

[0009] The data acquisition box is connected to multiple sensors to acquire their detection data; it is also connected to a voltage detector to acquire its detection data; and it is connected to a current detector to acquire its detection data.

[0010] The host computer is connected to the data acquisition box to acquire the detection data from the sensors, voltage detector, and current detector.

[0011] In one possible design, multiple sensors include a first sensor and a second sensor. The first sensor is disposed on the surface of the valve stem and is used to detect the torque of the valve stem. The second sensor is disposed at one end of the valve stem, and its rotor shaft is connected to the valve stem to detect the rotation angle of the valve stem.

[0012] In one possible design, the angle between the axis of the first sensor and the axis of the valve stem is θ, where θ is between 0° and 90°.

[0013] In one possible design, the angle θ between the axis of the first sensor and the axis of the valve stem is 45°.

[0014] In one possible design, at least two first sensors are provided on the surface of the valve stem, one of which has an angle of θ with the axis of the valve stem, and the other has an angle of -θ with the axis of the valve stem.

[0015] In one possible design approach, the first sensor is a fiber Bragg grating sensor.

[0016] In one possible design, the first sensor is a metal-encapsulated fiber Bragg grating sensor that is soldered onto the valve stem.

[0017] In one possible design, the electric ball valve is equipped with a fixture, and the second sensor is fixedly connected to the fixture.

[0018] In one possible design, the second sensor is an angular displacement sensor.

[0019] In one possible design, the collection box includes:

[0020] The fiber optic demodulator is connected to the first sensor to obtain the torque of the valve stem.

[0021] The data acquisition card is connected to the voltage detector to acquire the detection voltage of the voltage detector; connected to the current detector to acquire the detection current of the current detector; and connected to the second sensor to acquire the rotation angle of the valve stem.

[0022] Both the data acquisition card and the fiber optic demodulator are connected to the host computer.

[0023] In one possible design, the collection box also includes:

[0024] The voltage transmitter is connected between the voltage detector and the data acquisition card. It steps down the voltage detected by the voltage detector and outputs a voltage of 0 to 10V.

[0025] In one possible design, the collection box also includes:

[0026] The voltage converter, connected to the data acquisition card and voltage transmitter, converts the power supply voltage into the operating voltage required by the data acquisition card and voltage transmitter.

[0027] In one possible design, the current detector detects the operating current of the electric actuator, including:

[0028] Detect the current in the power supply circuit of the electric actuator, detect the current in the main control circuit of the electric actuator when it is turned on, detect the current in the main control circuit of the electric actuator when it is turned off, detect the current in the bypass control circuit of the electric actuator when it is turned on, and detect the current in the bypass control circuit of the electric actuator when it is turned off. Attached Figure Description

[0029] Figure 1 A schematic diagram of the structure of a detection system for an electric ball valve provided in an embodiment of this application;

[0030] Figure 2 A schematic diagram of the interface layout of the data acquisition box in a detection system for an electric ball valve provided in an embodiment of this application;

[0031] Figure 3 A partial circuit diagram of the internal circuitry of the electric actuator in an electric ball valve, provided as an embodiment of this application;

[0032] Figure 4 This is a schematic diagram showing the connection between the first sensor and the valve stem in a detection system for an electric ball valve provided in an embodiment of this application.

[0033] In the diagram: 1-Valve; 2-Valve stem; 3-First sensor; 4-Electric actuator; 5-Second sensor; 6-Control cabinet; 7-Current detector; 8-Voltage detector; 9-Acquisition box; 10-Data acquisition card; 11-Voltage converter; 12-Voltage transmitter; 13-Fiber grating demodulator; 14-Host computer. Detailed Implementation

[0034] Before introducing the embodiments of this disclosure, it should be noted that:

[0035] Some embodiments of this disclosure are described as processing flows. Although the various operational steps of the flow may be numbered sequentially, the operational steps may be performed in parallel, concurrently, or simultaneously.

[0036] The embodiments disclosed herein may use terms such as "first," "second," etc., to describe various features, but these features should not be limited by these terms. These terms are used merely to distinguish one feature from another.

[0037] The term “and / or” may be used in embodiments of this disclosure, and “and / or” includes any and all combinations of one or more of the associated features listed.

[0038] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0039] In this application, "at least one" means one, two, or more, and "more" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0040] It should be understood that when describing the connection or communication relationship between two components, unless it is explicitly stated that the two components are directly connected or communicate directly, the connection or communication between the two components can be understood as a direct connection or communication, or it can be understood as an indirect connection or communication through an intermediate component.

[0041] It should also be understood that the term “comprising” (also referred to as “includes”, “including”, “comprises” and / or “comprising”) as used in this specification specifies the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0042] It should be understood that the terms "an embodiment," "another embodiment," and "a possible design" used throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment or implementation is included in at least one embodiment of this application. Therefore, phrases such as "in one embodiment of this application," "in another embodiment of this application," and "a possible design" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0043] It should also be understood that the specific values ​​mentioned in the embodiments of this application are not intended to limit the specific dimensions of particular features or structures. The relevant values ​​may be illustrative examples for ease of understanding, or they may represent the theoretically optimal value for a certain feature. In practice, the relevant dimensions may be a range of values, such as ±10% or ±20% of the optimal theoretical value, depending on whether the corresponding technical effect can be achieved.

[0044] To make the technical solutions and advantages of the embodiments of this disclosure clearer, the exemplary embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this disclosure can be combined with each other.

[0045] Electric ball valves, as crucial components for pipeline fluid control, are widely used in systems such as oil and gas, chemical and pharmaceutical, and energy and power. The normal operation of electric ball valves is essential for the safe and reliable operation of equipment. The on / off state of the valve and the operational reliability of the actuator directly affect the safety and efficiency of the entire production system.

[0046] In existing solutions, the status monitoring of electric ball valves mainly relies on manual inspections or periodic maintenance, lacking real-time monitoring, which may lead to potential faults not being detected in a timely manner.

[0047] To address the aforementioned technical problems, this application provides a detection system for electric ball valves, which can enable real-time monitoring of the status of electric ball valves.

[0048] refer to Figure 1 , Figure 1 This is a schematic diagram of a detection system for an electric ball valve provided in an embodiment of this application. This detection system is used to detect the state of an electric ball valve. In this embodiment, as shown... Figure 1 As shown, the electric ball valve includes an electric actuator 4, a valve stem 2, and a valve 1. The electric actuator 4 is connected to the valve stem 2 via a transmission connection, and the valve stem 2 is connected to the valve 1. When the electric actuator 4 operates, its output shaft drives the valve stem 2 to rotate, which in turn drives the valve core of the valve 1 to move, thus opening and closing the valve 1. It should be noted that the electric ball valve in this embodiment is generally a rotary valve.

[0049] like Figure 1 As shown in this embodiment, the detection system for the electric ball valve specifically includes: multiple sensors, a voltage detector 8, a current detector 7, a data acquisition box 9, and a host computer 14. The multiple sensors are mounted on the valve stem 2 to detect the torque and rotation angle of the valve stem 2.

[0050] In this embodiment, "multiple sensors" refers to various types of sensors, including at least two different types. One type of sensor is mounted on the valve stem 2 and can detect the torque of the valve stem 2. The other type of sensor is also mounted on the valve stem 2 and can detect the rotation angle of the valve stem 2. Because the types of sensors are different, the mounting position and connection method of each type of sensor on the valve stem 2 may also differ. Subsequent embodiments will describe the specific type of each sensor, as well as its connection position and method with the valve stem 2.

[0051] Voltage detector 8 is connected to electric actuator 4 in electric ball valve and is used to detect the operating voltage of electric actuator 4.

[0052] In this embodiment of the application, a control cabinet 6 is also provided for controlling the operation of the electric ball valve. The control cabinet 6 is used to drive the electric actuator 4 in the electric ball valve. Multiple cables are provided between the control cabinet 6 and the electric actuator 4, including power supply cables for supplying power to the electric actuator 4 and control cables for controlling the opening and closing of the electric actuator 4.

[0053] For example, control cabinet 6 uses three-phase power to power electric actuator 4; therefore, the power supply cable may include three cables, named U, V, and W respectively. The control cable may include two cables for controlling electric actuator 4 to open and two cables for controlling electric actuator 4 to close.

[0054] In this embodiment, the voltage detector 8 is connected to the electric actuator 4 in the electric ball valve, meaning the voltage detector 8 is connected to the power supply cable of the electric actuator 4. Detecting the operating voltage of the electric actuator 4 refers to detecting the power supply voltage of the electric actuator 4.

[0055] Since control cabinet 6 supplies three-phase power to electric actuator 4 via U, V, and W cables, when detecting the power supply voltage of electric actuator 4, voltage detector 8 can be connected to any two of the U, V, and W cables in electric actuator 4. For example, voltage detector 8 can be a voltage clamp meter; by connecting the clamp jaws of the voltage clamp meter to any two of the power supply cables of electric actuator 4, the power supply voltage of electric actuator 4 can be detected.

[0056] The current detector 7 is connected to the electric actuator 4 in the electric ball valve and is used to detect the operating current of the electric actuator 4.

[0057] In this embodiment, the current detector 7 is connected to the electric actuator 4 in the electric ball valve, meaning that the current detector 7 is connected to both the power supply cable and the control cable of the electric actuator 4. Therefore, detecting the operating current of the electric actuator 4 includes detecting the power supply current of the electric actuator 4 and detecting other currents of the electric actuator 4, including detecting the current in the control circuit of the electric actuator 4. It should be noted that the current detector 7 used to detect the power supply current and the current in the control circuit of the electric actuator 4 can be the same current detector or multiple different current detectors. The specific selection can be based on actual needs and the function of the current detector 7.

[0058] In this embodiment, the control cabinet 6 supplies three-phase power to the electric actuator 4 via three cables: U, V, and W. Therefore, when detecting the power supply current of the electric actuator 4, the power supply current of the electric actuator 4 can be detected by detecting the current on any one of the three cables: U, V, and W.

[0059] Control cabinet 6 primarily controls the opening of electric actuator 4 via the open control cable and the closing control cable via the close control cable. Therefore, current detector 7 also detects the current on the open control cable and the current on the close control cable.

[0060] For example, the current detector 7 in this embodiment can be a clamp-on ammeter, also known as a current clamp. To detect the supply current of the electric actuator 4, the clamp probe of the current clamp is connected to any one of the power supply cables of the electric actuator 4, thus detecting the supply current of the electric actuator 4. To detect the current on the opening control cable, the clamp probe of the current clamp is connected to the opening control cable of the electric actuator 4, thus detecting the current in the opening control cable of the electric actuator 4. To detect the current on the closing control cable, the clamp probe of the current clamp is connected to the closing control cable of the electric actuator 4, thus detecting the current in the closing control cable of the electric actuator 4.

[0061] The data acquisition box 9 is used to acquire data detected by the sensors, voltage detector 8, and current detector 7. Specifically, the data acquisition box 9 is connected to multiple sensors and acquires the detection data from each sensor. The data acquisition box 9 is also connected to the voltage detector 8 and acquires its detection data. The data acquisition box 9 is connected to the current detector 7 and acquires its detection data. The host computer 14 is connected to the data acquisition box 9 and obtains the detection data from the multiple sensors, voltage detector 8, and current detector 7 acquired by the data acquisition box 9.

[0062] The data acquisition box 9 communicates with the host computer 14, and the data acquisition box 9 uploads the acquired data to the host computer 14 via USB and / or Modbus protocol. The host computer 14 then performs data storage, display, or fault diagnosis.

[0063] In one embodiment of this application, the plurality of sensors include a first sensor 3 and a second sensor 5. The first sensor 3 is disposed on the surface of the valve stem 2 and is used to detect the torque of the valve stem 2. The second sensor 5 is disposed at one end of the valve stem 2, and its rotor shaft is connected to the valve stem 2, used to detect the rotation angle of the valve stem 2.

[0064] During the operation of an electric ball valve, among the many parameters closely related to its operating status and overall performance, the dynamically changing torque of the valve stem 2 and the stroke of the valve stem 2 are two important parameters. The stroke of the valve stem 2 refers to the angular displacement generated when the output shaft of the electric ball valve actuator rotates, causing the valve stem 2, which is connected to the transmission, to move. Measuring the stroke of the valve stem 2 is crucial for accurately obtaining the real-time valve position and ensuring the valve opening degree.

[0065] Since the electric ball valve in this embodiment is mainly a rotary valve, the stroke of the valve stem 2 can be obtained by detecting the rotation angle of the valve stem 2. To detect the torque and rotation angle of the valve stem 2 in the electric ball valve, a first sensor 3 and a second sensor 5 are provided in this embodiment. The first sensor 3 is placed on the surface of the valve stem 2. When the axial force of the valve stem 2 changes, the relevant parameters in the first sensor 3 will change. By collecting the changes in the first sensor 3 through the acquisition box 9, the torque change on the valve stem 2 can be calculated. The second sensor 5 is placed at one end of the valve stem 2, and the rotor shaft of the second sensor 5 is connected to the valve stem 2. When the valve stem 2 rotates, the valve stem 2 will drive the rotor shaft of the second sensor 5 to rotate together, and the second sensor 5 can detect the rotation angle of the valve stem 2.

[0066] In one embodiment of this application, the first sensor 3 is, by way of example, a fiber Bragg grating sensor. A fiber Bragg grating sensor, based on the sensing process of a fiber Bragg grating, acquires sensing information by modulating the wavelength of the fiber Bragg grating with external physical parameters; it is a wavelength modulation type fiber optic sensor.

[0067] When the torque of valve stem 2 changes, that is, when the stress and strain in valve stem 2 change, the center wavelength of the fiber Bragg grating sensor will change accordingly. Therefore, by detecting the change in the center wavelength of the fiber Bragg grating sensor, and based on the relationship between the amount of change in the center wavelength of the fiber Bragg grating sensor and the torque of valve stem 2, the change in the torque of valve stem 2 can be detected.

[0068] In one embodiment of this application, the second sensor 5 is, by way of example, an angular displacement sensor. By setting an angular displacement sensor at one end of the valve stem 2 and connecting the rotor shaft of the angular displacement sensor to the valve stem 2, the rotation angle of the valve stem 2 can be detected. Angular displacement sensors generally provide high measurement accuracy and resolution, enabling precise measurement of the rotation angle of the valve stem 2 in an electric ball valve. Furthermore, the output signal of the angular displacement sensor includes analog voltage signals, current signals, digital signals, etc., which can be easily connected to various control devices and measuring instruments to achieve data transmission and processing.

[0069] In one embodiment of this application, since the multiple sensors include different types of sensors, and the data acquisition methods of the voltage detector 8 and the current detector 7 may also differ from those of the sensors, a data acquisition box 9 is provided to facilitate the acquisition of data from multiple sensors, as well as the acquisition of data detected by the voltage detector 8 and the current detector 7. The acquisition box 9 includes a fiber Bragg grating demodulator 13 and a data acquisition card 10, both of which are connected to the host computer 14.

[0070] The first sensor 3 is connected to the optical channel interface of the fiber Bragg grating demodulator 13 via a cable. The fiber Bragg grating demodulator 13 is used to convert optical signals into electrical signals and transmit the data to the host computer 14 via the Modbus protocol to obtain the torque of the valve stem 2.

[0071] Data acquisition card 10 is connected to voltage detector 8 to acquire the detection voltage of voltage detector 8. Data acquisition card 10 is connected to current detector 7 to acquire the detection current of current detector 7. Data acquisition card 10 is connected to the second sensor 5 to acquire the rotation angle of valve stem 2. Data acquisition card 10 is connected to host computer 14 via USB data cable to send the acquired data to host computer 14.

[0072] The interface layout inside the data acquisition box 9 can be referenced. Figure 2 , Figure 2 This is a schematic diagram of the interface layout of the data acquisition box 9 in a detection system for an electric ball valve provided in an embodiment of this application. Figure 2 As shown, the data acquisition box 9 is equipped with a current detector 7 interface, a voltage detector 8 interface, a first sensor 3 interface, and a second sensor 5 interface. Connecting the voltage detector 8, current detector 7, first sensor 3, and second sensor 5 to their respective interfaces on the data acquisition box 9 establishes a connection between the data acquisition box 9 and the sensor.

[0073] The system includes multiple interfaces for both the current detector 7 and the first sensor 3, allowing connection to multiple current detectors 7 and multiple first sensors 3. Alternatively, interfaces for a voltage detector 8 and a second sensor 5 can be added as needed. In this embodiment, since only one voltage detector 8 and one second sensor 5 are required, one voltage detector 8 interface and one second sensor 5 interface on the data acquisition box 9 suffice.

[0074] In one embodiment of this application, the rated supply voltage of the electric actuator 4 is 380V, and its actual operating voltage is also around 380V. The voltage detected by the voltage detector 8 is the supply voltage of the electric actuator 4, which is also around 380V. However, the voltage range that the data acquisition card 10 can accept is relatively small, generally between 0 and 10V. Therefore, to facilitate information acquisition by the data acquisition card 10, the acquisition box 9 also includes a voltage transmitter 12, which is connected between the voltage detector 8 and the data acquisition card 10. The voltage transmitter 12 can transform the voltage according to a certain proportional relationship, reducing the voltage detected by the voltage detector 8. The voltage output of the voltage transmitter 12 is between 0 and 10V, so that its output voltage is within the operating range of the data acquisition card 10.

[0075] In one embodiment of this application, the conventional power supply voltage is generally around 220V, while the operating voltage of the data acquisition card 10 and voltage transmitter 12 inside the acquisition box 9 is lower, and the power supply voltage of the data acquisition card 10 and voltage transmitter 12 is generally around 24V.

[0076] Therefore, a voltage converter 11 is also installed inside the data acquisition box 9. The input terminal of the voltage converter 11 is connected to the power supply, and the output terminal is connected to the data acquisition card 10 and the voltage transmitter 12. The voltage converter 11 converts the power supply voltage (220V) into the operating voltage required by the data acquisition card 10 and the voltage transmitter 12. The output voltage of the voltage converter 11 is generally around 24V, depending on the operating voltage of the data acquisition card 10 and the voltage transmitter 12.

[0077] refer to Figure 3 , Figure 3 This is a partial circuit diagram of the internal wiring of the electric actuator in an electric ball valve, provided as an embodiment of this application. Figure 3As shown, ST(0) is the main closing control circuit of electric actuator 4 in the electric ball valve, and 5A-5B are the bypass closing control circuits of electric actuator 4 in the electric ball valve. ST(C) is the main opening control circuit of electric actuator 4 in the electric ball valve, and 1A-1B are the bypass opening control circuits of electric actuator 4 in the electric ball valve. The bypass closing control circuit of electric actuator 4 is a parallel line connected to the main closing control circuit. Its function is to increase the current to the main closing control circuit at the moment of closing, thereby increasing the power of electric actuator 4 and making the electric ball valve easier to close. Similarly, the bypass opening control circuit of electric actuator 4 is a parallel line connected to the main opening control circuit. Its function is to increase the current to the main opening control circuit at the moment of opening, thereby increasing the power of electric actuator 4 and making the electric ball valve easier to open.

[0078] In one embodiment of this application, the current detector 7 detects the operating current of the electric actuator 4, including: detecting the current of the power supply circuit of the electric actuator 4, detecting the current of the electric actuator 4 opening the main control circuit, detecting the current of the electric actuator 4 closing the main control circuit, detecting the current of the electric actuator 4 opening the control bypass circuit, and detecting the current of the electric actuator 4 closing the control bypass circuit.

[0079] For example, taking the current detector 7 as a current clamp. Connect one current clamp to one of the three-phase power supply cables, connect one current clamp to the main control circuit for opening, one current clamp to the main control circuit for closing, one current clamp to the bypass control circuit for opening, and one current clamp to the bypass control circuit for closing. This allows for the detection of the current in the power supply circuit of the electric actuator 4, the current in the main control circuit for opening the electric actuator 4, the current in the main control circuit for closing the electric actuator 4, the current in the bypass control circuit for opening the electric actuator 4, and the current in the bypass control circuit for closing the electric actuator 4, respectively.

[0080] In one embodiment of this application, the first sensor 3 is a fiber Bragg grating sensor with metal encapsulation, wherein the fiber Bragg grating sensor is welded to the valve stem 2.

[0081] In this embodiment, the fiber Bragg grating sensor is encapsulated in metal, providing excellent protection. Furthermore, the metal encapsulation offers superior force transmission, allowing for more sensitive detection of torque changes on the valve stem 2 when the metal-encapsulated fiber Bragg grating sensor is mounted on the valve stem 2. Additionally, the metal encapsulation allows for direct welding of the fiber Bragg grating sensor to the valve stem 2, ensuring a secure connection. This welding method offers better stability compared to adhesive bonding.

[0082] In one embodiment of this application, the angle between the axis of the first sensor 3 and the axis of the valve stem 2 is θ, where θ is 0° to 90°.

[0083] It should be noted that in this embodiment, the first sensor 3 mainly refers to a fiber optic grating sensor. Therefore, the axis of the first sensor 3 refers to the straight line where the optical fiber is located, or a straight line passing through the center of the first sensor 3 and parallel to the optical fiber in the first sensor 3. Setting the angle between the axis of the first sensor 3 and the axis of the valve stem 2 to 0° to 90° facilitates the installation of the first sensor 3 on the valve stem 2, reduces restrictions on the orientation of the first sensor 3, and also enables the detection of the torque of the valve stem 2.

[0084] In one embodiment of this application, the angle θ between the axis of the first sensor 3 and the axis of the valve stem 2 is 45°.

[0085] For example, refer to Figure 4 , Figure 4 This is a schematic diagram showing the connection between the first sensor and the valve stem in a detection system for an electric ball valve provided in an embodiment of this application.

[0086] like Figure 4 As shown, the first sensor 3 is mounted on the outer surface of the valve stem 2, and the angle between the axis of the first sensor 3 and the axis of the valve stem 2 is 45°. Both ends of the first sensor 3 are fixed to the valve stem 2 by welding. For example, welding both ends of the first sensor 3 to the valve stem 2 ensures the stability of the connection between the first sensor 3 and the valve stem 2. Of course, besides welding, other connection methods can also be used to fix the first sensor 3. For example, adhesive can be used to fix the first sensor 3 to the outer surface of the valve stem 2.

[0087] Generally, the valve stem 2 is positioned perpendicular to the horizontal direction, meaning its axis is perpendicular to the horizontal. In this embodiment, the angle between the axis of the first sensor 3 and the axis of the valve stem 2 is 45°. Since the axis of the valve stem 2 is perpendicular to the horizontal direction, the angle between the axis of the first sensor 3 and the horizontal direction is also 45°. When setting the first sensor 3, the horizontal direction can also be used as a reference to determine its position on the valve stem 2.

[0088] In this embodiment, by setting the angle between the axis of the first sensor 3 and the axis of the valve stem 2 to 45°, the deformation at the welded positions at the upper and lower ends of the first sensor 3 is greatest when the valve stem 2 rotates, resulting in the greatest tensile force on the optical fiber inside the first sensor 3 and the most significant change in the wavelength of the optical fiber. The torque of the valve stem 2 can be calculated by subtracting the changed wavelength of the optical fiber in the first sensor 3 from its initial wavelength, and by considering the relationship between the offset of the center wavelength and the output torque of the electric actuator 4 in the electric ball valve.

[0089] In one embodiment of this application, at least two first sensors 3 are provided on the surface of the valve stem 2, wherein the angle between the axis of one first sensor 3 and the axis of the valve stem 2 is θ, and the angle between the axis of the other first sensor 3 and the axis of the valve stem 2 is -θ.

[0090] For example, at least two first sensors 3 are provided on the surface of the valve stem 2, wherein the angle between the axis of one first sensor 3 and the axis of the valve stem 2 is 45°, and the angle between the axis of the other first sensor 3 and the axis of the valve stem 2 is -45°.

[0091] In this embodiment, the first sensor 3 is a fiber Bragg grating sensor, which can directly measure physical quantities such as temperature and strain. However, because the fiber Bragg grating wavelength is sensitive to both temperature and strain—that is, both temperature and strain cause a shift in the fiber Bragg grating coupling wavelength—it is impossible to distinguish between temperature and strain simply by measuring this shift. Therefore, to solve the problem of cross-sensitivity and achieve differentiated measurement of temperature and stress, this paper proposes a method.

[0092] For example, by using two first sensors 3 with the same strain and temperature sensitivity, temperature interference during measurement can be eliminated, and measurement errors can be eliminated or reduced, making the detection results more accurate.

[0093] In one embodiment of this application, since the second sensor 5 is disposed at one end of the valve stem 2, and the rotor shaft of the second sensor 5 needs to be connected to the valve stem 2, a fixing fixture is provided on the electric ball valve to facilitate fixing the second sensor 5, and the second sensor 5 is fixedly connected to the fixing fixture.

[0094] like Figure 1 As shown, the second sensor 5 is located at one end of the valve stem 2. To facilitate the connection between the second sensor 5 and the valve stem 2, a fixing fixture is provided on the electric ball valve to fix the second sensor 5 to the fixing fixture. The main function of the fixing fixture is to provide support for the second sensor 5. When setting the fixing fixture, it can be placed on the electric actuator 4, or it can be placed elsewhere on the electric ball valve. It is advisable to do so without affecting the normal operation of the electric ball valve and while providing support for the second sensor 5.

[0095] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

[0096] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0097] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the scope of protection of this application includes the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of this application.

[0098] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the transmission circuit and its core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

[0099] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A detection system for an electric ball valve, the electric ball valve comprising an electric actuator, a valve stem, and a valve, wherein the electric actuator is throttle-connected to the valve stem, and the valve stem is connected to the valve, characterized in that, The detection system includes: Multiple sensors are mounted on the valve stem to detect the torque and rotation angle of the valve stem. A voltage detector, connected to the electric actuator, is used to detect the operating voltage of the electric actuator; A current detector, connected to the electric actuator, is used to detect the operating current of the electric actuator; The data acquisition box is connected to the multiple sensors to acquire the detection data of the sensors; it is also connected to the voltage detector to acquire the detection data of the voltage detector; and it is connected to the current detector to acquire the detection data of the current detector. The host computer is connected to the acquisition box to acquire the detection data of the sensor, the detection data of the voltage detector, and the detection data of the current detector.

2. The detection system according to claim 1, characterized in that, The plurality of sensors includes a first sensor and a second sensor; The first sensor is disposed on the surface of the valve stem and is used to detect the torque of the valve stem; The second sensor is disposed at one end of the valve stem, and the rotor shaft of the second sensor is connected to the valve stem to detect the rotation angle of the valve stem.

3. The detection system according to claim 2, characterized in that, The angle between the axis of the first sensor and the axis of the valve stem is θ, where θ is between 0° and 90°.

4. The detection system according to claim 3, characterized in that, The angle θ between the axis of the first sensor and the axis of the valve stem is 45°.

5. The detection system according to claim 3 or 4, characterized in that, At least two of the first sensors are provided on the surface of the valve stem, wherein the angle between the axis of one of the first sensors and the axis of the valve stem is θ, and the angle between the axis of the other first sensor and the axis of the valve stem is -θ.

6. The detection system according to claim 2, characterized in that, The first sensor is a fiber Bragg grating sensor.

7. The detection system according to claim 6, characterized in that, The first sensor is a metal-encapsulated fiber Bragg grating sensor, which is welded to the valve stem.

8. The detection system according to claim 2, characterized in that, The electric ball valve is equipped with a fixing fixture, and the second sensor is fixedly connected to the fixing fixture.

9. The detection system according to claim 8, characterized in that, The second sensor is an angular displacement sensor.

10. The detection system according to claim 2, characterized in that, The collection box includes: A fiber optic demodulator, connected to the first sensor, acquires the torque of the valve stem; A data acquisition card is connected to the voltage detector to acquire the detection voltage of the voltage detector; connected to the current detector to acquire the detection current of the current detector; and connected to the second sensor to acquire the rotation angle of the valve stem. Both the data acquisition card and the fiber Bragg grating demodulator are connected to the host computer.

11. The detection system according to claim 10, characterized in that, The collection box also includes: A voltage transmitter is connected between the voltage detector and the data acquisition card to step down the voltage detected by the voltage detector. The voltage output by the voltage transmitter is 0 to 10V.

12. The detection system according to claim 11, characterized in that, The collection box also includes: A voltage converter, connected to the data acquisition card and the voltage transmitter, converts the power supply voltage into the operating voltage required by the data acquisition card and the voltage transmitter.

13. The detection system according to claim 1, characterized in that, The current detector detects the operating current of the electric actuator, including: The current of the power supply circuit of the electric actuator is detected, the current of the main control circuit of the electric actuator is detected, the current of the main control circuit of the electric actuator is detected, the current of the control bypass circuit of the electric actuator is detected, and the current of the control bypass circuit of the electric actuator is detected.

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