A pressure measurement system suitable for use with a variable angle pipe

Abstract

The present application relates to the technical field of pipeline pressure measurement, and provides a pressure measurement system suitable for pipelines with variable angles, which comprises a conveying pipeline, a first short pipe, a rotating pipeline, a pressure measurement box, a second short pipe and a pressure measurement device; the conveying pipeline is connected with the rotating pipeline through the first short pipe; the rotating pipeline is fixedly connected with the pressure measurement box; the pressure measurement box is fixedly connected with the second short pipe; the pressure measurement device is installed on the second short pipe; an exhaust hole is arranged on the pressure measurement box; an inclination sensor is installed on the inner side wall of the pressure measurement box; a control unit is arranged in the rotating pipeline; the control unit controls the rotation of the rotating pipeline according to the inclination signal of the inclination sensor so that the exhaust hole on the pressure measurement box is kept at the highest position. The pressure measurement system can be used for pressure measurement in the scene where the included angle between the conveying pipeline and the horizontal plane is 0°-90°, and can be adapted to various angle pipeline structures such as elbows and inclined pipeline sections without the need for customized modification, thereby solving the problem of poor adaptability of traditional measurement systems to pipeline angles.

Description

Technical Field

[0001] This invention relates to the technical field of pipeline pressure measurement, and in particular to a pressure measurement system applicable to pipelines with varying angles. Background Technology

[0002] In pipeline pressure measurement experiments, different actual working conditions need to be simulated by adjusting the pipeline angle, and the pressure data of the fluid inside the pipeline needs to be acquired simultaneously to verify the rationality of the pipeline design or to analyze the correlation between fluid pressure and pipeline angle. Currently, existing fixed-point pressure measurement technologies typically design sensor installation positions based on the pressure distribution characteristics of straight pipe sections, without considering the flow regime and pressure field distortion caused by angle changes. These technologies generally suffer from low measurement accuracy, poor angle adaptability, and insufficient dynamic response, making it difficult to meet the requirements for accurate and stable pressure monitoring in pipe sections with varying angles. Therefore, there is an urgent need for those skilled in the art to design a pressure measurement system that can adapt to pipelines with different angle changes and achieve high-precision pressure measurement. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a pressure measurement system applicable to pipelines with variable angles, including a delivery pipeline, a first short pipe, a rotating pipeline, a pressure measuring box, a second short pipe, and a pressure measuring device; The conveying pipeline is connected to the rotating pipeline through the first short pipe. The rotating pipeline is fixedly connected to the pressure measuring box. The rotating pipeline is configured to drive the pressure measuring box to rotate within the range of 0°-360°. The pressure measuring box is fixedly connected to the second short pipe. The pressure measuring device is installed on the second short pipe. The pressure testing chamber is equipped with an exhaust port, and an inclination sensor is installed on the inner wall of the pressure testing chamber. The inclination sensor is configured to measure the angle between the pressure testing chamber and the horizontal plane in real time. The rotating pipe is equipped with a control unit, which controls the rotation of the rotating pipe according to the tilt signal of the tilt sensor so that the exhaust port on the pressure measuring box is kept at the highest position.

[0004] Furthermore, when the exhaust port is at its highest point, the axis of the pressure measuring box is perpendicular to the horizontal plane.

[0005] Furthermore, the rotating pipe includes a fixed hose, a rotating drive mechanism, and a variable diameter short pipe. The fixed hose and the variable diameter short pipe are respectively connected to both ends of the rotating drive mechanism. The fixed hose is fixedly connected to the first short pipe, and the variable diameter short pipe is fixedly connected to the pressure measuring box. The variable diameter short pipe is configured to drive the pressure measuring box to rotate under the drive of the rotating drive mechanism.

[0006] Furthermore, the rotary drive mechanism includes a drive motor, a first sealing ring, a housing, a second sealing ring, a bearing, and a rotating shaft. The housing has a motor mounting end face and a shaft hole. The drive motor is mounted on the motor mounting end face. The outer ring of the bearing is interference-fitted / transition-fitted onto the inner wall of the shaft hole, and the inner ring of the bearing is interference-fitted onto the rotating shaft. The drive shaft of the drive motor is connected to the rotating shaft. A first sealing ring is provided between the drive motor and the housing, and a second sealing ring is provided between the rotating shaft and the housing. The rotating shaft is connected to a reducing pipe. Driven by the drive motor, the rotating shaft drives the reducing pipe to rotate. The first and second sealing rings prevent leakage of the conveyed medium and ensure rotational flexibility. The bearing supports the rotating mechanical body, reduces the coefficient of friction during movement, and ensures rotational accuracy.

[0007] Furthermore, the variable diameter short pipe is equipped with a rotation angle sensor, which is configured to monitor the actual rotation angle of the variable diameter short pipe.

[0008] Furthermore, the vent is located at the top of the pressure testing chamber, the top of the pressure testing chamber is also equipped with an vent control valve, and the bottom of the pressure testing chamber is equipped with a sand discharge hole and a sand discharge control valve. The exhaust port is a one-way outlet used to discharge air from the pressure testing chamber and prevent outside air from entering; the exhaust control valve is used to control the opening and closing of the exhaust port; the sand discharge port is used to discharge the sediment deposited at the bottom of the pressure testing chamber; the sand discharge control valve is used to control the opening and closing of the sand discharge port.

[0009] Furthermore, an ultrasonic liquid level detection probe is installed inside the pressure testing chamber. The ultrasonic liquid level detection probe is configured to monitor the liquid level inside the pressure testing chamber in real time. When the liquid level drops, the exhaust control valve is opened to release the air inside the pressure testing chamber; when the liquid level recovers, the exhaust control valve is closed.

[0010] Furthermore, the control unit is electrically connected to the rotation drive mechanism and the tilt sensor, and the control unit includes a signal processing module, a control algorithm module, and a drive control module; The signal processing module receives and filters the tilt signal transmitted by the tilt sensor; the control algorithm module calculates the required rotation angle and direction of the rotating pipe based on the processed tilt signal; the drive control module controls the drive motor to operate based on the calculation results of the control algorithm module, thereby adjusting the rotation of the rotating pipe so that the exhaust port on the pressure measuring box is kept at the highest position.

[0011] Furthermore, the specific steps executed by the control algorithm module are as follows: When the exhaust port of the pressure testing chamber is at its highest position, the angle between the pressure testing chamber and the horizontal plane is [value missing]. Receive the current tilt angle transmitted by the signal processing module. ; Calculate the angle of rotation required for the rotating pipe : If θ is positive, then the direction of rotation is positive; otherwise, the direction of rotation is negative. Precise control is achieved using a fuzzy PID control algorithm, specifically: ① Set the desired value of the rotation angle ,Right now = ; ② Measure the actual rotation angle of the rotating pipe. ; ③ Calculation error The calculation formula is: ④ Based on error Calculate control quantity u The calculation formula is as follows: In the formula: , , These are the proportional coefficient, integral coefficient, and differential coefficient, respectively, and ec is the rate of change of error. ⑤ Calculate the control quantity It is transmitted to the drive control module.

[0012] Furthermore, the specific steps performed by the drive control module are as follows: Received control quantity Then, based on the control quantity The size and sign control the speed and direction of rotation of the drive motor. The drive shaft drives the rotating shaft to rotate under the drive of the drive motor, thereby causing the variable diameter short pipe to rotate, which in turn causes the pressure measuring box to rotate. The rotation angle is monitored in real time by a rotation angle sensor during the rotation process. When the rotation angle Achieve the expected value At this time, the control drive motor stops rotating, ultimately bringing the exhaust port on the pressure measuring box to its highest position to ensure the accuracy of pressure measurement.

[0013] Furthermore, the pressure measuring device includes a differential pressure sensor and a pressure sensor.

[0014] The present invention has the following beneficial effects: (1) The present invention achieves accurate pressure measurement by installing a pressure measuring box on the conveying pipeline and rotating the pressure measuring box through the rotating pipeline to keep the exhaust hole on the pressure measuring box at the highest position. The pressure measurement can be performed in scenarios where the conveying pipeline has an angle of 0°-90° with the horizontal plane. It can be adapted to various angle pipeline structures such as elbows and inclined pipe sections without customized modification, which solves the problem of poor adaptability of traditional measurement systems to pipeline angles and significantly improves the versatility in complex pipeline layouts. (2) The pressure measuring device in this invention integrates a differential pressure sensor and a pressure sensor. When measuring together, the error is further eliminated by comparing the data, thus improving the measurement accuracy. By comparing the measurement results of the two sensors, possible errors can be identified and corrected. If one sensor malfunctions or malfunctions, the data of the other sensor can still be used as a reference. Using them together can more easily detect abnormalities. If the measurement results of the two sensors are too different, it may indicate that one of the sensors has malfunctioned or has been interfered with. (3) The present invention monitors the angle between the pressure measuring box and the horizontal plane in real time by using the tilt sensor on the inner side wall of the pressure measuring box. The control unit automatically adjusts the rotation drive mechanism through signal processing, algorithm calculation and drive control to keep the exhaust port at the highest position, ensuring the best exhaust effect without manual intervention. (4) The present invention can achieve comprehensive monitoring of pipeline pressure distribution by arranging a pressure measurement system every 3m on the pipeline; it can monitor pressure changes in long-distance pipelines, which helps to analyze the pressure status of the entire pipeline system; it can monitor pressure changes in short-distance pipelines, which helps to analyze pressure differences in local areas. In the pipeline system, abnormal pressure changes may be caused by pipeline blockage, leakage or other faults. By monitoring pressure changes in different areas, the fault point can be located more quickly, thereby improving the efficiency of fault diagnosis. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 This is a structural diagram of the pressure measuring box in this invention.

[0017] Figure 3 This is a schematic diagram of the rotating pipe in this invention.

[0018] Figure 4 This is a disassembly diagram of the rotating pipe in this invention.

[0019] Figure 5 This is a schematic diagram of the connection of the rotating pipe in this invention, excluding the outer casing.

[0020] Figure 6 This is a schematic diagram of the control unit in this invention.

[0021] Figure 7 This is a schematic diagram of the present invention installed in a pipe with varying angles. Detailed Implementation

[0022] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. However, these embodiments are not intended to limit the present invention. Any similar structures and similar variations of the present invention should be included in the protection scope of the present invention. The commas in the present invention all indicate the relationship between and. The English letters in the present invention are case-sensitive.

[0023] like Figure 1 As shown, this invention provides a pressure measurement system applicable to pipelines with varying angles, including a delivery pipeline 1, a first short pipe 2, a rotating pipeline 3, a pressure measuring box 4, a second short pipe 5, and a pressure measuring device 6. The delivery pipeline 1 is inserted into the side wall of the first short pipe 2. Specifically, the delivery pipeline 1 has a side opening, and the first short pipe 2 is sealed to the delivery pipeline 1 through the side opening. The delivery pipeline 1 is connected to the rotating pipeline 3 through the first short pipe 2. The first short pipe 2 and the rotating pipeline 3 are fixedly connected to the pressure measuring box 4. The rotating pipeline 3 is configured to drive the pressure measuring box 4 to rotate within a range of 0°-360°. The pressure measuring box 4 is fixedly connected to the second short pipe 5, and the pressure measuring device 6 is installed on the second short pipe 5. The pressure measuring device 6 includes a differential pressure sensor 6-1 and a pressure sensor 6-2. The differential pressure sensor 6-1 is used to measure the pressure difference, and the pressure sensor 6-2 is used to measure the pressure value. When the differential pressure sensor 6-1 and the pressure sensor 6-2 measure simultaneously, more accurate data can be obtained through comparative testing. By testing two different types of sensors, the measurement results of the two sensors can be compared, potential errors can be identified, and corrections can be made. If one sensor malfunctions or malfunctions, the data from the other sensor can still be used as a reference. Using differential pressure sensor 6-1 and pressure sensor 6-2 together makes it easier to detect anomalies. If the measurement results of the two sensors differ too much, it may indicate that one of the sensors is malfunctioning or has been interfered with. Alternatively, differential pressure sensor 6-1 and pressure sensor 6-2 can also be used individually. The pressure measuring box 4 is used to store the transport medium in the pipeline. By stabilizing the amount of medium stored, pressure fluctuations are reduced, thereby improving the accuracy of the measured pressure. The pressure measurement system of this invention can measure the angle between the transport pipeline 1 and the horizontal plane within the range of 0-90°.

[0024] like Figure 2As shown, the pressure testing chamber 4 has an exhaust port 4-1 and an exhaust control valve 4-2 on its top, and a sand discharge port 4-3 and a sand discharge control valve 4-4 arranged on its bottom. The exhaust port 4-1 is a one-way outlet used to discharge air from the pressure testing chamber and prevent outside air from entering. The exhaust control valve 4-2 is used to control the opening and closing of the exhaust port. The sand discharge port 4-3 is used to discharge the sediment deposited at the bottom of the pressure testing chamber. The sand discharge control valve 4-4 is used to control the opening and closing of the sand discharge port. The exhaust port 4-1 and the exhaust control valve 4-2 work together to discharge air from the pressure testing chamber in a timely manner (and prevent outside air from entering), avoiding pressure transmission distortion caused by residual air. The sand discharge port 4-3 and the sand discharge control valve 4-4 can remove sediment deposited at the bottom, preventing impurities from affecting the fluidity of the medium and the sensing accuracy of the sensor. The control valve design of the sand discharge port 4-3 and the vent port 4-1 facilitates regular removal of deposited impurities and inspection of the venting function, reducing maintenance difficulty. The flexible connection of the fixed hose 3-1 adapts to different installation scenarios, avoiding the problem of frequent replacement of irregularly shaped adapters due to changes in pipe angle in traditional systems, thus reducing equipment reuse costs and installation complexity. An tilt sensor is installed on the inner wall of the pressure testing chamber 4, which is configured to measure the angle between the pressure testing chamber 4 and the horizontal plane in real time. When the vent port is at its highest point, the axis of the pressure testing chamber is perpendicular to the horizontal plane, and the tilt sensor can detect this specific angle and output a tilt signal. An ultrasonic liquid level detection probe is installed inside the pressure testing chamber 4, which is configured to monitor the liquid level in the pressure testing chamber in real time. When the liquid level drops, the vent control valve 4-2 is opened to release the air inside the pressure testing chamber 4; when the liquid level recovers, the vent control valve 4-2 is closed. The ultrasonic liquid level detection probe is linked to the exhaust control valve 4-2 to automatically vent / close the valve when the liquid level changes, further improving the automation level of the system and reducing the intensity of manual operation.

[0025] like Figure 3 As shown, the rotating pipe 3 includes a fixed hose 3-1, a rotating drive mechanism 3-2, and a variable diameter short pipe 3-3. The fixed hose 3-1 and the variable diameter short pipe 3-3 are respectively connected to the two ends of the rotating drive mechanism 3-2. The fixed hose 3-1 is fixedly connected to the first short pipe 2, and the variable diameter short pipe 3-3 is fixedly connected to the pressure measuring box 4. The variable diameter short pipe 3-3 is configured to drive the pressure measuring box 4 to rotate under the drive of the rotating drive mechanism 3-2. A control unit 3-11 is provided inside the rotating pipe 3. The control unit 3-11 controls the rotation of the rotating pipe 3 according to the tilt signal of the tilt sensor to keep the exhaust port 4-1 on the pressure measuring box 4 at the highest position.

[0026] like Figure 4As shown, the rotary drive mechanism 3-2 includes a drive motor 3-4, a first sealing ring 3-5, a housing 3-6, a second sealing ring 3-7, a bearing 3-8, and a rotary shaft 3-9. The housing 3-6 has a motor mounting end face and a shaft hole. The drive motor 3-4 is mounted on the motor mounting end face. The outer ring of the bearing 3-8 is interference-fitted / transition-fitted onto the inner wall of the shaft hole, and the inner ring of the bearing 3-8 is interference-fitted onto the rotary shaft 3-9. The drive shaft 3-10 of the drive motor 3-4 is connected to the rotary shaft 3-9. A first sealing ring 3-5 is provided between the drive motor 3-4 and the housing 3-6, and a second sealing ring 3-7 is provided between the rotary shaft 3-9 and the housing 3-6. The rotary shaft 3-9 is connected to the reducing pipe 3-3. Driven by the drive motor 3-4, the rotary shaft 3-9 drives the reducing pipe 3-3 to rotate, ultimately realizing the rotation of the pressure measuring box 4. Among them, sealing ring 3-5 and sealing ring 3-7 are used to prevent leakage of the conveyed medium and ensure the flexibility of rotation, while bearing 3-8 is used to support the rotating mechanical body, reduce the coefficient of friction during movement, and ensure rotational accuracy. A rotation angle sensor is installed on the variable diameter short pipe, which is configured to monitor the actual rotation angle of the variable diameter short pipe.

[0027] like Figure 5-6 As shown, the control unit 3-11 is electrically connected to the rotary drive mechanism 3-2 and the tilt sensor. The control unit 3-11 includes a signal processing module 3-12, a control algorithm module 3-13 and a drive control module 3-14. The signal processing module 3-12 is used to receive and filter the tilt signal transmitted by the tilt sensor; the control algorithm module 3-13 calculates the angle and direction of rotation required for the rotating pipe 3 based on the processed tilt signal; the drive control module 3-14 controls the drive motor 3-4 to run based on the calculation result of the control algorithm module 3-13, so as to realize the rotation adjustment of the rotating pipe 3 and keep the exhaust port 4-1 on the pressure measuring box 4 at the highest position.

[0028] The specific steps executed by the control algorithm module 3-13 are as follows: When the exhaust port 4-1 of the pressure measuring chamber 4 is in its highest position, the angle between the pressure measuring chamber 4 and the horizontal plane is... Receives the current tilt angle transmitted by the signal processing module 3-12 ; Calculate the angle of rotation required for the rotating pipe : If θ is positive, then the direction of rotation is positive; otherwise, the direction of rotation is negative. Precise control is achieved using a fuzzy PID control algorithm, specifically: ① Set the desired value of the rotation angle ,Right now = ; ② Measure the actual rotation angle of the rotating pipe. ; ③ Calculation error The calculation formula is: ④ Based on error Calculate control quantity u The calculation formula is as follows: In the formula: , , These are the proportional coefficient, integral coefficient, and differential coefficient, respectively, and ec is the rate of change of error. ⑤ Calculate the control quantity Transmitted to drive control module 3-14.

[0029] The calculation process for the proportional coefficient, integral coefficient, and differential coefficient is as follows: (1) Fuzzy controller design: Design a two-input three-output fuzzy controller, with the input variable being the error. e and error change rate The output variable is the adjustment amount of the proportional coefficient. Integral coefficient adjustment and differential coefficient adjustment amount ; (2) Fuzzy set and universe of discourse partitioning: The output variable and the output variable are divided into seven fuzzy linguistic values: {negative large, negative medium, negative small, zero, positive small, positive medium, positive large}, corresponding to {NB, NM, NS, ZO, PS, PM, PB} respectively. The calculation error is set. e and error change rate ec The domain of discourse is set to [- T e , T e ]and[ -T ec , T ec ], where represents the maximum allowable angle error and the maximum error rate of change, respectively, and the triangular membership function is selected as the mapping membership function; (3) Fuzzy reasoning: Based on empirical rules, fuzzy rules are established. Based on the fuzzy rules, the input variables are fuzzified to determine their membership degrees in each fuzzy set. Combining the membership degrees of the input variables, the Mamdani method is applied to synthesize the output fuzzy sets of all matching rules to obtain the final output fuzzy set, i.e., the fuzzy quantization value. (4) Defuzzification processing: The centroid method is used to defuzzify the fuzzy inference results, converting the fuzzy output into specific numerical values. The specific calculation formula is as follows: In the formula: The adjusted control quantity, For fuzzy quantization values, Membership degree; (5) PID parameter update: based on the adjustment amount obtained after defuzzification processing , , The PID parameters are then multiplied by the corresponding scaling factor to correct them in real time. The corrected PID parameters are: In the formula: , , These are the initial proportional, integral, and differential parameters, respectively. , , These are the corrected proportional, integral, and differential parameters, respectively. , , These are the scaling factors corresponding to the parameter correction amounts.

[0030] The specific steps performed by the drive control module 3-14 are as follows: Received control quantity Then, based on the control quantity The size and sign control the speed and direction of rotation of the drive motor. The drive shaft drives the rotating shaft to rotate under the drive of the drive motor, thereby causing the variable diameter short pipe to rotate, which in turn causes the pressure measuring box to rotate. The rotation angle is monitored in real time by a rotation angle sensor during the rotation process. When the rotation angle Achieve the expected value At this time, the control drive motor stops rotating, ultimately bringing the exhaust port on the pressure measuring box to its highest position to ensure the accuracy of pressure measurement.

[0031] Preferably, a pressure measurement system is installed every 3 meters along the delivery pipeline to monitor pressure parameters at different locations along the pipeline, such as... Figure 7As shown in the diagram, only two pressure measurement systems are labeled. Placing a pressure measurement system every 3 meters along the pipeline allows for comprehensive monitoring of the pipeline's pressure distribution; it can monitor pressure changes over long distances, aiding in the analysis of the overall pipeline system's pressure status; and it can monitor pressure changes over short distances, helping to analyze pressure differences in localized areas. In a pipeline system, abnormal pressure changes may be caused by blockages, leaks, or other malfunctions. By monitoring pressure changes in different areas, fault locations can be identified more quickly, thereby improving the efficiency of fault diagnosis.

[0032] This invention achieves accurate pressure measurement by installing a pressure measuring box 4 on the conveying pipeline 1, which rotates via a rotating pipe 3 to keep the vent hole on the pressure measuring box 4 at its highest position. Pressure measurement can be performed in scenarios where the conveying pipeline 1 has an angle of 0°-90° with the horizontal plane. It can adapt to various pipe structures such as elbows and inclined pipe sections without customized modifications, solving the problem of poor adaptability to pipe angles in traditional measurement systems and significantly improving its versatility in complex pipe layouts. The tilt sensor on the inner wall of the pressure measuring box 4 monitors its angle with the horizontal plane in real time. The control unit automatically adjusts the rotating drive mechanism through signal processing, algorithm calculation, and drive control to keep the vent hole at its highest position, ensuring optimal venting effect without manual intervention.

[0033] Although preferred embodiments of this 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 appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

Claims

1. A pressure measurement system suitable for pipes with varying angles, characterized in that, It includes a conveying pipeline, a first short pipe, a rotating pipeline, a pressure measuring box, a second short pipe, and a pressure measuring device; The conveying pipeline is connected to the rotating pipeline through the first short pipe. The rotating pipeline is fixedly connected to the pressure measuring box. The rotating pipeline is configured to drive the pressure measuring box to rotate within the range of 0°-360°. The pressure measuring box is fixedly connected to the second short pipe. The pressure measuring device is installed on the second short pipe. The pressure testing chamber is equipped with an exhaust port, and an inclination sensor is installed on the inner wall of the pressure testing chamber. The inclination sensor is configured to measure the angle between the pressure testing chamber and the horizontal plane in real time. The rotating pipe is equipped with a control unit, which controls the rotation of the rotating pipe according to the tilt signal of the tilt sensor so that the exhaust port on the pressure measuring box is kept at the highest position; The rotating pipe includes a fixed hose, a rotating drive mechanism, and a variable diameter short pipe. The fixed hose and the variable diameter short pipe are respectively connected to the two ends of the rotating drive mechanism. The fixed hose is fixedly connected to the first short pipe, and the variable diameter short pipe is fixedly connected to the pressure measuring box. The variable diameter short pipe is configured to drive the pressure measuring box to rotate under the drive of the rotating drive mechanism. The rotary drive mechanism includes a drive motor, a first sealing ring, a housing, a second sealing ring, a bearing, and a rotary shaft. The housing has a motor mounting end face and a shaft hole. The drive motor is mounted on the motor mounting end face. The outer ring of the bearing is interference-fitted / transition-fitted onto the inner wall of the shaft hole. The inner ring of the bearing is interference-fitted onto the rotary shaft. The drive shaft of the drive motor is connected to the rotary shaft. A first sealing ring is provided between the drive motor and the housing. A second sealing ring is provided between the rotary shaft and the housing. The rotary shaft is connected to a variable diameter short pipe. Under the drive of the drive motor, the rotary shaft drives the variable diameter short pipe to rotate. The vent is located at the top of the pressure testing chamber, and the top of the pressure testing chamber is also equipped with an vent control valve. The bottom of the pressure testing chamber is equipped with a sand discharge hole and a sand discharge control valve. The vent is a one-way outlet used to discharge air from the pressure testing chamber and prevent outside air from entering; the vent control valve is used to control the opening and closing of the vent; the sand discharge hole is used to discharge the sediment deposited at the bottom of the pressure testing chamber; the sand discharge control valve is used to control the opening and closing of the sand discharge hole. An ultrasonic liquid level detection probe is installed inside the pressure testing chamber. The ultrasonic liquid level detection probe is configured to monitor the liquid level inside the pressure testing chamber in real time. When the liquid level drops, the exhaust control valve is opened to release the air inside the pressure testing chamber; when the liquid level recovers, the exhaust control valve is closed.

2. The pressure measurement system for use with a multi-angle pipe according to claim 1, wherein When the exhaust port is at its highest point, the axis of the pressure measuring box is perpendicular to the horizontal plane.

3. The pressure measurement system for use with a multi-angle pipe according to claim 1, wherein The variable diameter short pipe is equipped with a rotation angle sensor, which is configured to monitor the actual rotation angle of the variable diameter short pipe.

4. The pressure measurement system for use with a multi-angle pipe according to claim 3, wherein The control unit is electrically connected to the rotary drive mechanism and the tilt sensor, and the control unit includes a signal processing module, a control algorithm module and a drive control module. The signal processing module receives and filters the tilt signal transmitted by the tilt sensor; the control algorithm module calculates the required rotation angle and direction of the rotating pipe based on the processed tilt signal; the drive control module controls the drive motor to operate based on the calculation results of the control algorithm module, thereby adjusting the rotation of the rotating pipe so that the exhaust port on the pressure measuring box is kept at the highest position.

5. A pressure measurement system for use with a multi-angle pipe according to claim 4, wherein, The specific steps executed by the control algorithm module are as follows: When the exhaust hole of the pressure box is set at the highest position, the included angle between the pressure box and the horizontal plane is , receives the current inclination angle transmitted by the signal processing module ; Calculating the angle that the rotating pipe needs to rotate : If θ is positive, then the direction of rotation is positive; otherwise, the direction of rotation is negative. Precise control is achieved using a fuzzy PID control algorithm, specifically: ① Set the desired value of the rotation angle , i.e. = ; ② Measure the actual rotation angle of the rotating pipe. ; ③ Calculation error The calculation formula is: ④ Based on error Calculate control quantity u The calculation formula is as follows: In the formula: , , These are the proportional coefficient, integral coefficient, and differential coefficient, respectively, and ec is the rate of change of error. ⑤ Calculate the control quantity It is transmitted to the drive control module.

6. A pressure measurement system applicable to pipelines with varying angles according to claim 5, characterized in that, The specific steps performed by the drive control module are as follows: Received control quantity Then, based on the control quantity The size and sign control the speed and direction of rotation of the drive motor. The drive shaft drives the rotating shaft to rotate under the drive of the drive motor, thereby causing the variable diameter short pipe to rotate, which in turn causes the pressure measuring box to rotate. The rotation angle is monitored in real time by a rotation angle sensor during the rotation process. When the rotation angle Achieve the expected value At this time, the control drive motor stops rotating, ultimately bringing the exhaust port on the pressure testing box to its highest position to ensure the accuracy of pressure measurement.

7. A pressure measurement system applicable to pipelines with varying angles according to claim 1, characterized in that, The pressure measuring device includes a differential pressure sensor and a pressure sensor.

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