Swing check valve position detection method

Abstract

The invention relates to a valve position detection method for a swing check valve. Comprising the steps that S1, a groove is formed in the non-sealing side of a valve clack of the check valve, and a first number of permanent magnet components are arranged in the groove; s2, a second number of magnetic field induction parts are arranged on the periphery of the valve body of the check valve, and the induction range formed by all the magnetic field induction parts is larger than or equal to the swing range of the valve clack; s3, when the valve clack is at the preset initial position, magnetic field induction data corresponding to the magnetic field induction component are initialized; and S4, when the valve clack swings, magnetic field induction data corresponding to each magnetic field induction part are obtained, and the current position of the valve clack is obtained according to the magnetic field induction data corresponding to the magnetic field parts so as to obtain the valve position of the check valve. According to the invention, non-contact real-time high-precision measurement can be realized.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and more specifically to a method for detecting the valve position of a swing check valve. Background Art

[0002] The swing check valve relies on the open and closed state of the valve disc to ensure the unidirectional flow of the process fluid, but its operating status monitoring faces significant challenges under complex working conditions such as high temperature, high pressure, and strong corrosion. Traditional detection methods that rely on manual inspections or mechanical contacts cannot accurately quantify the dynamic opening and have serious lags; optical and strain sensors have technical bottlenecks such as poor stability and measurement distortion due to structural limitations and environmental interference, resulting in the lack of early prediction and warning mechanisms for potential backflow risks, which seriously threatens the safety and operation and maintenance efficiency of industrial systems.

[0003] As a key fluid control device, real-time monitoring of the open and closed status of the swing check valve is crucial to the safe and stable operation of nuclear power plants. When the valve disc is not completely closed (such as due to foreign matter blocking or wear), the medium backflow can easily cause pipeline pressure fluctuations, pump reversal, and even system paralysis. Traditional regular inspections or empirical judgments have serious lags, and existing automated detection technologies are limited by valve body structure and harsh working conditions (high temperature / corrosion / vibration), making it difficult to provide high-precision real-time feedback on valve position. It is urgent to develop new embedded measurement solutions.

[0004] Commonly used methods include mechanical trigger switches, external visual monitoring, and strain sensors. Among them, the mechanical trigger switch is installed in the closed position of the valve disc, which can only determine the fully open / closed state, but cannot quantify the opening. External visual monitoring uses a camera or laser scanner to capture the valve disc angle, which is easily affected by medium atomization and oil pollution. The strain sensor is pasted on the shaft to detect torque, but it is prone to fatigue and fall off under long-term alternating stress, and has poor stability. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for detecting the valve position of a swing check valve in view of the above-mentioned partial technical defects of the prior art.

[0006] The technical solution adopted by the present invention to solve the technical problem is to construct a method for detecting the valve position of a swing check valve. The method comprises:

[0007] S1. Arranging a groove on the non-sealing side of the valve disc of the check valve, and arranging a first number of permanent magnet components in the groove;

[0008] S2. Disposing a second number of magnetic field sensing components around the valve body of the check valve, wherein the sensing range formed by all the magnetic field sensing components is greater than or equal to the swing range of the valve disc;

[0009] S3, when the valve flap is at a preset initial position, initializing the magnetic field sensing data corresponding to the magnetic field sensing component;

[0010] S4. When the valve flap swings, magnetic field sensing data corresponding to each magnetic field sensing component is obtained, and the position of the current valve flap is obtained according to the magnetic field sensing data corresponding to the magnetic field component to obtain the valve position of the check valve.

[0011] Preferably, in the method for detecting the valve position of a swing check valve described in an embodiment of the present invention, the first number is greater than or equal to 4 and / or the second number is greater than or equal to 3.

[0012] Preferably, in the swing check valve position detection method described in the embodiment of the present invention, in the step S1, the step of providing a first number of permanent magnet components in the groove includes:

[0013] The first number of permanent magnet components are arranged in a circle around the center of the valve flap.

[0014] Preferably, in the method for detecting the valve position of a swing check valve described in the embodiment of the present invention, the permanent magnet components are arranged at equal intervals.

[0015] Preferably, in the method for detecting the valve position of a swing check valve described in the embodiment of the present invention, the permanent magnet component is spherical.

[0016] Preferably, in the swing check valve position detection method described in the embodiment of the present invention, in the step S2, the second number of magnetic field sensing components are arranged around the valve body of the check valve, including:

[0017] All the magnetic field induction components are arranged in an arc shape on the central axis section of the valve cover of the check valve.

[0018] Preferably, in the swing check valve position detection method described in the embodiment of the present invention, all the magnetic field sensing components and the centers of the valve discs are arranged at equal intervals.

[0019] Preferably, in the swing check valve position detection method described in the embodiment of the present invention, in the step S3, when the valve flap is in a preset initial position, the magnetic field sensing data corresponding to the magnetic field sensing component is initialized; comprising:

[0020] When the valve flap swings at zero degree, the magnetic field sensing data of the magnetic field sensing component is initialized.

[0021] Preferably, in the swing check valve position detection method described in the embodiment of the present invention, in the step S4, when the valve disc swings, the magnetic field sensing data corresponding to each magnetic field sensing component is obtained, and the current position of the valve disc is obtained according to the magnetic field sensing data corresponding to the magnetic field sensing component to obtain the valve position of the check valve; comprising:

[0022] According to the formula Get the current position of the valve disc, where θ is the swing angle of the valve disc, k is the calibration coefficient, and B i is the magnetic induction data of the i-th magnetic field induction component, and n is the second number.

[0023] Preferably, the swing check valve position detection method described in the embodiment of the present invention further includes:

[0024] The pressure data before and after the check valve are obtained to obtain the pressure difference data therebetween. When the pressure difference is greater than a preset value, Kalman filtering is performed on the magnetic induction data of the magnetic field induction component.

[0025] The implementation of the method for detecting the valve position of a swing check valve of the present invention has the following beneficial effects: non-contact real-time high-precision measurement can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0027] Figure 1 It is a program flow chart of an embodiment of a method for detecting the valve position of a swing check valve of the present invention;

[0028] Figure 2 is a schematic diagram of the layout of permanent magnet components in one embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of the layout of magnetic field sensing components in one embodiment of the present invention;

[0030] Figure 4 It is a schematic diagram of the layout of magnetic field sensing components in one embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0032] like Figure 1 As shown, an embodiment of a method for detecting the valve position of a swing check valve of the present invention is disclosed. Figure 1In the embodiment of a swing check valve position detection method of the present invention shown, the method of the present invention includes the following steps, specifically, S1, setting a groove on the non-sealing side of the valve disc of the check valve, and setting a first number of permanent magnet components in the groove. S2, setting a second number of magnetic field sensing components on the periphery of the valve body of the check valve, wherein the sensing range formed by all the magnetic field sensing components is greater than or equal to the swing range of the valve disc. S3, when the valve disc is in a preset initial position, initializing the magnetic field sensing data corresponding to the magnetic field sensing component. S4, when the valve disc swings, obtaining the magnetic field sensing data corresponding to each magnetic field sensing component, and obtaining the position of the current valve disc according to the magnetic field sensing data corresponding to the magnetic field component to obtain the valve position of the check valve.

[0033] Based on step S1, a groove can be mechanically designed on the non-sealed side of the valve disc edge of the check valve, and a first number of corrosion-resistant permanent magnets, i.e., permanent magnet components, can be embedded in the groove. Multiple permanent magnets form a magnet array to ultimately form a corresponding magnetic field source. The permanent magnet is encapsulated in the internal cavity of the valve disc to avoid direct contact with the medium to ensure that the working parameters of the permanent magnet will not change or become abnormal due to contamination of the medium. In one embodiment, the permanent magnet can be a samarium cobalt component. The shape of the permanent magnet component can be spherical, for example, using samarium cobalt magnets, wherein the volume of the sphere can be set according to the valve disc structure. In one embodiment, a magnetic bead with a structure that meets Φ3mm×5mm can be selected.

[0034] In one embodiment, the first number is greater than or equal to 4. That is, the number of permanent magnets may be set to be greater than or equal to 4.

[0035] Optionally, in step S1, the first number of permanent magnet components are arranged in the groove, including: the first number of permanent magnet components are arranged in a circular shape around the center of the valve flap. Specifically, when designing the groove, the groove can be annular or arc-shaped around the center of the valve flap, and a plurality of permanent magnets can be arranged in the groove to eventually form a rotating magnetic field. In a specific embodiment, when the valve flap is circular, the groove and the edge of the valve flap can be arranged at equal intervals, and the groove is finally made into an annular or arc-shaped shape similar to the shape of the valve flap.

[0036] like Figure 2 As shown, in a specific embodiment, the number of permanent magnet components is four, and the four permanent magnet components 111 are arranged on the valve flap 110 along the center of the valve flap 110 to form a circumferential arrangement with equal spacing.

[0037] Based on step S2, a second number of magnetic field sensing components can be installed on the outer periphery of the valve body of the check valve, and the magnetic field generated by the permanent magnet component can be sensed by the magnetic field sensing component to generate corresponding sensing data. It can be understood that each magnetic field sensing component may only sense a part of the area. In order to avoid the situation where the swinging position of the valve flap cannot be sensed by any magnetic field sensing component during the swinging process of the valve flap, when setting the number and position of the magnetic field sensing components, the valve flap cannot exceed the sensing range formed by all magnetic field sensing components during the swinging process of the valve flap.

[0038] In a specific embodiment, the second number is greater than or equal to 3. That is, the number of magnetic field sensing components can be set to be greater than or equal to 3. In another embodiment, the magnetic field sensing component can be a magnetic field sensor such as a Hall sensor.

[0039] In one embodiment, in step S2, the second number of magnetic field sensing components are arranged around the valve body of the check valve, including: all the magnetic field sensing components are arranged symmetrically in an arc shape on the middle axis section of the valve cover of the check valve. Specifically, the arc-shaped symmetrical arrangement can avoid sudden changes in the output voltage of the magnetic field sensing components, such as Hall sensors, and ensure fitting accuracy.

[0040] In one embodiment, all the magnetic field sensing components and the center of the valve disc are arranged at equal intervals. Specifically, when an arc-shaped symmetrical arrangement is performed, the magnetic field sensing components and the center of the valve disc are arranged at equal intervals to improve the accuracy of data processing. The magnetic sensing components are based on the principle of covering the full range of valve disc swing, so that the full opening of the valve can be measured and the fitting distortion of partial opening angles (such as too large opening) can be avoided. The array arrangement of multiple magnetic sensing components can reduce the output signal fluctuations caused by the rapid and small vibration of the valve disc.

[0041] like Figure 3 and Figure 4 As shown, in a specific embodiment, the magnetic field sensing component is a Hall sensor, and the number is 3. The center of the valve cover is zero degrees, and the positions of three Hall sensors 121 are arranged in sequence at intervals of 90 degrees as zero degrees. The three Hall sensors 121 are arranged on the periphery of the valve body 120 at angles of 90°, 180°, and 207°, that is, two are arranged horizontally and radially on the valve body 120, and one is arranged at the bottom of the valve body 120. The center point of the sensor is located on the central axis of the valve cover 130, covering the full range of valve flap swing. It should be understood that for different types of check valves, the position of the sensor can be arranged according to the specific situation, with covering the full range of valve flap swing as the standard for arrangement.

[0042] Based on step S3, in order to ensure the accuracy of the data and eliminate the influence of environmental factors during the processing of the sensing signal, the data needs to be initialized. That is, when the valve flap is set at a preset initial position, the sensing data corresponding to all magnetic field sensing components are initialized to obtain the calibration value of each magnetic field sensing component. In one embodiment, the subsequent processing process can also be compensated based on the obtained data.

[0043] In one embodiment, in step S3, when the valve flap is in a preset initial position, the magnetic field sensing data corresponding to the magnetic field sensing component is initialized; including: when the valve flap is in a zero-degree swing, the magnetic field sensing data of the magnetic field sensing component is initialized. That is, in order to facilitate the initialization of data during the measurement process, when the valve flap is in a zero-degree swing, i.e., in a fully closed state, the magnetic field sensing data corresponding to all magnetic field sensing components are obtained and initialized.

[0044] Based on step S4, during the application of the check valve, when the check valve opening is adjusted, that is, the valve disc swings, the magnetic field sensing data corresponding to all magnetic field sensing components can be detected in real time to determine the current valve disc swing angle based on all the magnetic field sensing data obtained, and then obtain the valve position of the check valve.

[0045] Optionally, in step S4, when the valve flap swings, the magnetic field sensing data corresponding to each magnetic field sensing component is obtained, and the current position of the valve flap is obtained according to the magnetic field sensing data corresponding to the magnetic field sensing component to obtain the valve position of the check valve; including: according to the formula Get the current position of the valve disc, where θ is the swing angle of the valve disc, k is the calibration coefficient, and B i is the magnetic induction data of the i-th magnetic field induction component, and n is the second number.

[0046] Specifically, the magnetic induction data corresponding to each magnetic field sensing component is obtained. Among them, the magnetic field sensing data of the magnetic field sensing component can be obtained by processing the sensing signal of the magnetic field sensing component through a specific data processing circuit. The data processing circuit may include an instrument amplifier and a microcontroller, that is, the sensing signal of the magnetic field sensing component is amplified by the instrument amplifier and input into the microcontroller, and the microcontroller obtains the corresponding magnetic field sensing data based on internal calculations. When reading the sensing data of a magnetic field sensing component such as a Hall sensor, the signal can be sampled by a sampling circuit. For example, the sampling frequency is set to 10kHz, the sampling time is 10ms each time, and 500 data points are collected. A low-pass filter (cut-off frequency 160Hz) is used to remove high-frequency noise. The signal is amplified to a range of 0-2.5V by an instrument amplifier of model AD620. The analog signal is converted into a 24-bit digital signal using ADS1256, and finally input into the microcontroller. Based on the obtained magnetic field induction intensity, the formula is used The magnetic field sensing data of all magnetic induction components are fitted to obtain the swing angle θ of the current valve flap. Among them, the calibration coefficient k can be obtained according to the specific structure of the valve, the installation position of the magnet and the installation position of the sensor. This calibration coefficient k can be understood as the slope when the fitting function is selected as a linear function in the least squares method. In some embodiments, the fitting function can be selected according to specific needs, such as linear function fitting, exponential function fitting, etc., so as to obtain the functional relationship between the magnetic field intensity B measured by the magnetic induction component and the swing angle of the valve flap, that is, the opening angle θ, through a suitable fitting function, so as to obtain the swing angle θ of the current valve flap.

[0047] At the same time, when obtaining the magnetic field induction intensity, the formula Get the magnetic field sensing data of the i-th magnetic field sensing component, where V i It is the induced voltage of the magnetic field sensing component obtained by the microcontroller, Gain is the amplification factor of the instrument amplifier, and K is the magnetic field intensity coefficient, which is determined according to the properties of the Hall element itself and is usually provided by the sensing component manufacturer.

[0048] In one embodiment, the swing check valve position detection method provided by the present invention also includes: obtaining the pressure data before and after the check valve to obtain the pressure difference data between the two, and when the pressure difference is greater than a preset value, performing Kalman filtering on the magnetic induction data of the magnetic field sensing component. That is, during the test, pressure transmitters can be respectively set in front of and behind the check valve to obtain the pressure data before and after the check valve through the pressure transmitter, and the pressure difference fluctuation before and after the check valve is obtained according to the difference between the pressure data before and after the valve. If the pressure difference fluctuation ΔP before and after the valve is greater than a preset value, Kalman filtering is started to suppress the instantaneous jitter error of the valve disc. Among them, the preset value can be set to be greater than or equal to 0.2MPa. That is, when the pressure difference fluctuation ΔP before and after the valve>0.2MPa, Kalman filtering is started.

[0049] In one embodiment, the swing angle θ of the current valve disc detected is encapsulated according to the communication protocol, and the encapsulated data is sent to the CAN bus through a controller area network transceiver such as TJA1050. The operating status and abnormal events are stored and uploaded to the DCS system through the CAN bus to support online monitoring and remote control.

[0050] In one embodiment, the control state of the check valve can be monitored. When the check valve is not operated, the low power consumption mode is entered, and the relevant detection process is not performed. Until the check valve is detected to be operated, the detection process is triggered to be executed. In one embodiment, the detection process can also be triggered by a set trigger instruction. In one embodiment, the detection process can also be performed by setting a timing operation, for example, according to a preset time interval.

[0051] Through this process, high-precision detection can be achieved, and the detection accuracy of the valve disc position can reach 0.5°. At the same time, it can be applied to various environments. The magnetic induction process is not affected by oil and water vapor and can withstand working conditions of -40℃ to 150℃. The process supports online replacement of sensors through modular design without stopping the valve body for disassembly. It can also be linked with the DCS system to warn of jamming / delayed closing failures in advance to avoid backflow accidents.

[0052] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A method for detecting the valve position of a swing check valve, characterized in that: The method comprises: S1. Arranging a groove on the non-sealing side of the valve disc of the check valve, and arranging a first number of permanent magnet components in the groove; S2. Disposing a second number of magnetic field sensing components around the valve body of the check valve, wherein the sensing range formed by all the magnetic field sensing components is greater than or equal to the swing range of the valve disc; S3, when the valve flap is at a preset initial position, initializing the magnetic field sensing data corresponding to the magnetic field sensing component; S4. When the valve flap swings, magnetic field sensing data corresponding to each magnetic field sensing component is obtained, and the position of the current valve flap is obtained according to the magnetic field sensing data corresponding to the magnetic field component to obtain the valve position of the check valve.

2. The method for detecting the position of a swing check valve according to claim 1, characterized in that: The first number is greater than or equal to 4 and / or the second number is greater than or equal to 3.

3. The method for detecting the position of a swing check valve according to claim 1, characterized in that: In the step S1, the step of arranging a first number of permanent magnet components in the groove includes: The first number of permanent magnet components are arranged in a circle around the center of the valve flap.

4. The method for detecting the valve position of a swing check valve according to claim 3, characterized in that: The permanent magnet components are arranged at equal intervals.

5. The method for detecting the position of a swing check valve according to claim 1, characterized in that: The permanent magnet component is arranged in a spherical shape.

6. The method for detecting the position of a swing check valve according to claim 1, characterized in that: In the step S2, the second number of magnetic field sensing components are arranged around the valve body of the check valve, including: All the magnetic field induction components are arranged in an arc shape on the central axis section of the valve cover of the check valve.

7. The method for detecting the position of a swing check valve according to claim 6, characterized in that: All the magnetic field sensing components and the centers of the valve flaps are arranged at equal intervals.

8. The method for detecting the position of a swing check valve according to claim 1, characterized in that: In the step S3, when the valve flap is at a preset initial position, the magnetic field sensing data corresponding to the magnetic field sensing component is initialized; including: When the valve flap swings at zero degree, the magnetic field sensing data of the magnetic field sensing component is initialized.

9. The method for detecting the position of a swing check valve according to claim 1, characterized in that: In the step S4, when the valve flap swings, the magnetic field sensing data corresponding to each magnetic field sensing component is obtained, and the current position of the valve flap is obtained according to the magnetic field sensing data corresponding to the magnetic field sensing component to obtain the valve position of the check valve; including: According to the formula Get the current position of the valve disc, where θ is the swing angle of the valve disc, k is the calibration coefficient, and B i is the magnetic induction data of the i-th magnetic field induction component, and n is the second number.

10. The method for detecting the position of a swing check valve according to claim 1, characterized in that: The method further comprises: The pressure data before and after the check valve are obtained to obtain the pressure difference data therebetween. When the pressure difference is greater than a preset value, Kalman filtering is performed on the magnetic induction data of the magnetic field induction component.

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