Method and device for detecting differential pressure on both sides of a pipe

Abstract

The present application relates to the technical field of flow detection, in particular to a pipe two-side differential pressure detection method and device, comprising a detection mechanism; further comprising an adjusting mechanism and a cleaning mechanism, both of which are installed on the detection mechanism; the detection mechanism detects the flow of normal flow rate liquid, the adjusting mechanism detects the flow of low flow rate liquid in cooperation with the detection mechanism, and the cleaning mechanism cleans the detection mechanism; the detection mechanism is installed on the liquid conveying pipeline, so that the liquid passes through the detection mechanism, the flow of the liquid is detected by the detection mechanism, when detecting the flow of low flow rate liquid, the detection mechanism is adjusted by the adjusting mechanism, so that the flow rate of the liquid flowing through the detection mechanism increases, the flow of the liquid is detected by the detection mechanism again, and the detection mechanism is cleaned by the cleaning mechanism, so as to ensure the accuracy of the detection mechanism and improve the practicability of the device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flow detection, in particular to a pipe two-side differential pressure detection method and device. BACKGROUND

[0002] The vortex shedding frequency of a vortex flowmeter can be detected in a variety of different ways. Among them, the sensor system of the differential pressure detection type vortex flowmeter is independent of the vortex generator and located outside the pipeline, so it has the advantage of not needing to cut off the pipe flow when repairing and replacing the sensor.

[0003] The existing differential pressure detection type vortex flowmeter, such as the vortex generator differential pressure detection type vortex flowmeter disclosed in the utility model patent with publication number CN201503281U, mainly consists of a through-flow pipe, a vortex generator, a differential pressure sensor, and a vortex frequency signal processing circuit, etc. structure, adopts a method of taking differential pressure on both sides of the pipe wall, that is, differential pressure holes are arranged on the flow pipe walls on both sides of the vortex generator, the differential pressure between the two points is measured by a differential pressure sensor, the vortex shedding frequency is obtained through the differential pressure signal output by the differential pressure sensor, and then the volumetric flow value is obtained.

[0004] However, it is found in use that the existing vortex flowmeter has a relatively simple structure, and when the liquid flow rate in the pipe is lower than the set value, it is difficult to generate vortices before and after the vortex generator, which in turn makes it difficult to detect the flow rate of the liquid. In addition, when detecting objects containing particles, the particle matter is easily left in the pressure sensing hole of the vortex generator, which in turn affects the detection accuracy, resulting in poor practicality, so there is an urgent need for a pipe two-side differential pressure detection method and device to improve the above problems. SUMMARY

[0005] To solve the above technical problems, the present application provides a pipe two-side differential pressure detection method and device, which installs a detection mechanism on a liquid conveying pipeline, makes the liquid pass through the detection mechanism, detects the flow rate of the liquid through the detection mechanism, adjusts the detection mechanism through an adjusting mechanism when detecting the flow rate of low flow rate liquid, increases the flow rate of the liquid flowing through the detection mechanism, detects the flow rate of the liquid through the detection mechanism, and cleans the detection mechanism through a cleaning mechanism to ensure the accuracy of the detection mechanism, thereby improving the practicality of the device.

[0006] The pipe two-side differential pressure detection device of the present application comprises a detection mechanism, and further comprises an adjusting mechanism and a cleaning mechanism, both of which are installed on the detection mechanism.

[0007] The detection mechanism detects the flow rate of normal flow rate liquid, the adjusting mechanism cooperates with the detection mechanism to detect the flow rate of low flow rate liquid, and the cleaning mechanism cleans the detection mechanism.

[0008] The detection mechanism is installed on the liquid delivery pipeline, allowing the liquid to pass through it. The flow rate of the liquid is detected by the detection mechanism. When detecting the flow rate of low-velocity liquids, the detection mechanism is adjusted by an regulating mechanism to increase the flow rate of the liquid passing through it. The flow rate of the liquid is then detected again by the detection mechanism. Furthermore, the detection mechanism is cleaned by a cleaning mechanism to ensure its accuracy and thus improve the practicality of the equipment.

[0009] Preferably, the detection mechanism includes a flow pipe, two sets of connecting flanges, a first sealing shell, two sets of vortex generators, a differential pressure sensor, a vortex frequency signal processing circuit, pressure-sensing lines, and a waterproof mechanism. The two sets of connecting flanges are respectively installed on both ends of the flow pipe, and each set of connecting flanges is provided with a sealing gasket groove. The first sealing shell is installed on the flow pipe. The vortex generators are installed in the flow pipe and the first sealing shell. The vortex generators are provided with two sets of pressure-sensing holes, located symmetrically at the front and rear of the vortex generators. Each set of pressure-sensing holes has a pressure-conducting pipe inside. The differential pressure sensor and the vortex frequency signal processing circuit are both installed in the first sealing shell, and the differential pressure sensor is connected to the vortex frequency signal processing circuit. The tops of both sets of pressure-sensing lines are connected to the differential pressure sensor, and the bottoms of both sets of pressure-sensing lines are connected to the differential pressure sensor. The liquid passes through the vortex generator, and the bottoms of the two sets of pressure-sensing lines extend into the pressure-conducting pipes in the two sets of pressure-sensing holes. A waterproof mechanism is installed on the first sealed housing to maintain the air pressure inside the first sealed housing. The flow pipe is installed on the liquid delivery pipeline through two sets of connecting flanges. The waterproof mechanism maintains the air pressure inside the first sealed housing to prevent water from flooding the differential pressure sensor and the vortex frequency signal processing circuit. The liquid then flows through the flow pipe, and vortices are alternately generated and separated in front of and behind the vortex generator. This generates alternating pulsating differential pressure in front of and behind the flow pipe. The alternating pulsating differential pressure is guided to the differential pressure sensor through the two sets of pressure-sensing holes and the two sets of pressure-sensing lines, so that the differential pressure sensor can detect the differential pressure pulsation frequency. The vortex frequency signal processing circuit processes the differential pressure pulsation frequency detected by the differential pressure sensor and then detects the flow rate.

[0010] Preferably, the waterproof mechanism includes a liquid level sensor, an exhaust pipe, an electric cylinder, a piston, an electric control valve, an electric control valve, and an air supply pipe. The liquid level sensor is installed in a sealed housing, the exhaust pipe is installed on the sealed housing, the electric cylinder is fixedly installed in the exhaust pipe, the piston is slidably installed in the exhaust pipe, and the top of the electric cylinder is connected to the piston. The electric control valves are both installed on the top of the exhaust pipe, and the electric control valve communicates with the interior of the sealed housing through the air supply pipe. When the electric control valve is opened, the electric cylinder contracts, causing the piston to move downward and draw air into the exhaust pipe. Then, the electric control valve is closed, and the electric control valve is opened. When the electric cylinder extends, the piston moves upward and exhausts air into the sealed housing. The above steps are repeated to keep the liquid level in the sealed housing below the liquid level sensor.

[0011] Preferably, the adjustment mechanism includes a vortex generator sleeve, an electric cylinder two, a bracket, a fitting mechanism, and a support mechanism. The vortex generator sleeve is slidably fitted onto the vortex generator body. The bracket is fixedly installed in the sealed outer shell one. The electric cylinder two is installed at the bottom of the bracket, and the bottom of the electric cylinder two is fixedly connected to the vortex generator sleeve. The fitting mechanism is installed at the bottom of the vortex generator sleeve. The support mechanism is installed on the flow pipe. The top of the vortex generator sleeve is provided with a fitting plate five. When detecting the flow rate of a liquid with a low flow velocity, the electric cylinder two extends, causing the vortex generator sleeve to descend and aligning the perforations on the vortex generator sleeve with the pressure sensing holes on the vortex generator body. This reduces the flow area of ​​the liquid in the flow pipe, increases the flow velocity of the liquid passing through the flow pipe, and ensures that alternating pulsating differential pressure is generated in front of and behind the vortex generator body. At the same time, the bottom of the fitting plate five is flush with the top arc surface inside the flow pipe.

[0012] Preferably, the bonding mechanism includes a bonding plate one and a bonding plate two. The bonding plate one is installed at the bottom of the vortex generator sleeve, and the bonding plate two is installed at the bottom of the bonding plate one. Both the bonding plate one and the bonding plate two are in sliding contact with the vortex generator. When the vortex generator sleeve descends, the perforation on it aligns with the pressure-sensing hole on the vortex generator, making the top of the bonding plate one flush with the bottom arc surface inside the flow tube. After the vortex generator sleeve is reset, the bottom of the bonding plate two is flush with the top arc surface of the flow tube, ensuring the stability of the liquid flowing through the flow tube.

[0013] Preferably, the bonding mechanism includes a fixing frame, a heating element, and a shape memory metal bonding plate. The heating element is installed inside the sealed outer shell through the fixing frame. The shape memory metal bonding plate is installed at the bottom of the vortex generator sleeve, and the shape memory metal bonding plate is in sliding contact with the vortex generator. When the vortex generator sleeve descends, when the perforation on it aligns with the pressure sensing hole on the vortex generator, the shape memory metal bonding plate cools down under the scouring of the liquid, and then becomes an upwardly curved arc plate, so that its top is flush with the arc surface of the bottom of the flow tube. After the vortex generator sleeve is reset, the shape memory metal bonding plate is heated by the heating element, so that it forms a downwardly curved arc plate, so that the bottom of the shape memory metal bonding plate is flush with the arc surface of the top of the flow tube, ensuring the stability of the liquid flowing through the flow tube.

[0014] Preferably, the support mechanism includes a second sealed housing, a cylinder, a fourth bonding plate, a second exhaust pipe, a third electric cylinder, a second piston, a third electric control valve, and a fourth electric control valve. The second sealed housing is mounted on the flow pipe, the cylinder is mounted inside the second sealed housing, the fourth bonding plate is mounted on the cylinder, the second exhaust pipe is mounted on the second sealed housing, the third electric cylinder is fixedly mounted inside the second exhaust pipe, the second piston is slidably mounted inside the second exhaust pipe, and both the third and fourth electric control valves are mounted on the second exhaust pipe. The third electric control valve is connected to the inside of the cylinder via a connecting pipe. When the vortex body descends, the electric cylinder... The cylinder contracts, drawing air out of the cylinder and causing the cylinder to lower the fourth bonding plate, creating space for the first and second bonding plates or the memory metal bonding plate. After the vortex body returns to its original position, the third electric cylinder extends, causing the second piston to discharge air into the cylinder. The extension of the cylinder then resets the fourth bonding plate, maintaining the flatness of the bottom of the flow pipe. When the air volume in the second exhaust pipe is insufficient, the third electric valve closes and the fourth electric valve opens. The third electric cylinder contracts again, drawing air into the second exhaust pipe. Then, the fourth electric valve closes and the third electric valve opens to replenish the air in the cylinder.

[0015] Preferably, the cleaning mechanism includes two sets of nozzles and two sets of connectors. Both sets of nozzles and connectors are installed on the flow pipe, and the two sets of nozzles correspond to the pressure-sensing holes at the front and rear of the vortex generator, respectively. The two sets of connectors are connected to the two sets of nozzles. The two sets of connectors are connected to the drainage equipment. The liquid used for rinsing is drained into the two sets of connectors, and then the liquid is sprayed into the pressure-sensing holes at the front and rear of the vortex generator through the two sets of nozzles to clean the residue in the pressure-sensing holes.

[0016] Preferably, the ends of both sets of nozzles are arc-shaped and flush with the inner wall of the flow tube, thereby reducing the impact on the flow of liquid within the flow tube.

[0017] The present invention provides a method for detecting differential pressure across a pipe to detect the flow rate of a liquid, comprising the following steps:

[0018] S1. Install the flow pipe onto the liquid delivery pipeline using two sets of connecting flanges;

[0019] S2. By opening the second electric control valve, the first electric cylinder contracts, causing the first piston to move downward and draw air into the exhaust pipe. Then, the second electric control valve is closed, the first electric control valve is opened, and the first electric cylinder extends, causing the first piston to move upward and discharge air into the first sealed housing. The above steps are repeated to keep the liquid level in the first sealed housing below the liquid level sensor.

[0020] S3. Liquid flows through the flow pipe, and vortices are alternately generated and separated in front of and behind the vortex generator. This generates alternating pulsating differential pressure in front of and behind the flow pipe. The alternating pulsating differential pressure is guided to the differential pressure sensor through two sets of pressure sensing holes and two sets of pressure tapping lines. The differential pressure sensor detects the differential pressure pulsation frequency. The differential pressure pulsation frequency detected by the differential pressure sensor is then processed by the vortex frequency signal processing circuit to detect the flow rate.

[0021] S4. When detecting the flow rate of a liquid with a low flow rate, the extension of the second electric cylinder causes the vortex generator sleeve to descend and aligns the perforation on the vortex generator sleeve with the pressure sensing hole on the vortex generator body. This reduces the flow area of ​​the liquid in the flow tube, increases the flow rate of the liquid passing through the flow tube, and ensures that alternating pulsating differential pressure is generated in front of and behind the vortex generator body.

[0022] S5. When the vortex generator sleeve descends, the electric cylinder three retracts to draw out the air from the cylinder, which in turn causes the cylinder to drive the bonding plate four to descend, leaving space for the bonding mechanism. When the perforation on the vortex generator sleeve aligns with the pressure sensing hole on the vortex generator, the descending vortex generator sleeve scrapes off the adhering material on the surface of the vortex generator. At the same time, the bonding mechanism, in conjunction with the bonding plate five, fills the gaps at the bottom and top of the flow tube. After the vortex generator sleeve returns to its original position, the bonding mechanism fills the gap at the top of the flow tube. The electric cylinder three extends, causing the piston two to discharge air into the cylinder. The extension of the cylinder causes the bonding plate four to return to its original position, maintaining the flatness of the bottom of the flow tube and ensuring the stability of the liquid flowing through the flow tube.

[0023] S6. After the equipment has been used for a long time, connect the two sets of connectors to the drainage equipment. Drain the liquid used for flushing into the two sets of connectors, and then spray the liquid into the pressure-sensing holes at the front and rear of the vortex generator through the two sets of nozzles to clean the residue in the pressure-sensing holes.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. By adjusting the size of the vortex generator through the vortex generator sleeve, the flow area of ​​the liquid in the flow pipe is adjusted, thereby adjusting the flow rate of the liquid and ensuring the stability of the equipment.

[0026] 2. By cleaning impurities on the surface of the vortex generator during its lifting and lowering process, combined with cleaning the pressure-sensing holes using nozzles, the accuracy of the equipment is ensured.

[0027] 3. The fitting mechanism ensures smooth liquid flow through the flow pipe, thereby reducing interference during equipment testing. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the first isometric structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the second isometric structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the third isometric structure of the present invention;

[0031] Figure 4 This is the present invention. Figure 3 A magnified structural diagram of part A in the diagram;

[0032] Figure 5 This is a front view structural diagram of the present invention;

[0033] Figure 6 This is a frontal cross-sectional structural diagram of the present invention;

[0034] Figure 7 This is a front cross-sectional view of the present invention, which includes a heating element and a memory metal bonding plate.

[0035] Figure 8 This is the present invention. Figure 7 A schematic diagram of the enlarged structure of part B in the diagram;

[0036] Figure 9 This is a schematic diagram of the right-side structure of the present invention;

[0037] Figure 10 This is an isometric schematic diagram of the two structures of the vortex generator sleeve and the bonding plate of the present invention;

[0038] Figure 11 This is a schematic diagram of the right-side cross-sectional structure of the exhaust pipe II of the present invention.

[0039] The attached diagram shows the following components: 1. Flow pipe; 2. Connecting flange; 3. Sealing gasket groove; 4. Sealing housing one; 5. Vortex generator; 6. Pressure sensing port; 7. Differential pressure sensor; 8. Vortex frequency signal processing circuit; 9. Pressure tapping line; 10. Liquid level sensor; 11. Exhaust stack; 12. Electric cylinder one; 13. Piston one; 14. Electric control valve one; 15. Electric control valve two; 16. Gas delivery pipe one; 17. Vortex generator sleeve; 8. Perforation; 19. Electric cylinder II; 20. Bracket; 21. Adhesive plate I; 22. Adhesive plate II; 23. Fixing frame; 24. Heating element; 25. Memory metal adhesive plate; 26. Sealing shell II; 27. Cylinder; 28. Adhesive plate IV; 29. ​​Exhaust pipe II; 30. Electric cylinder III; 31. Piston II; 32. Electric control valve III; 33. Electric control valve IV; 34. Nozzle; 35. Connector; 36. Adhesive plate V. Detailed Implementation

[0040] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0041] Example 1: As Figures 1 to 11 As shown, a differential pressure detection device for both sides of a pipe includes a detection mechanism; it also includes an adjustment mechanism and a cleaning mechanism, both of which are installed on the detection mechanism.

[0042] The detection mechanism detects the flow rate of liquids at normal flow rates, the adjustment mechanism works in conjunction with the detection mechanism to detect the flow rate of liquids at low flow rates, and the cleaning mechanism cleans the detection mechanism.

[0043] The detection mechanism includes a flow pipe 1, two sets of connecting flanges 2, a sealing housing 4, two sets of vortex generators 5, a differential pressure sensor 7, a vortex frequency signal processing circuit 8, a pressure-sensing pipeline 9, and a waterproof mechanism. The two sets of connecting flanges 2 are respectively installed on both ends of the flow pipe 1, and each set of connecting flanges 2 is provided with a sealing gasket groove 3. The sealing housing 4 is installed on the flow pipe 1. The vortex generators 5 are installed in the flow pipe 1 and the sealing housing 4. The vortex generators 5 are provided with two sets of pressure-sensing holes 6, located at the front and rear of the vortex generators 5, respectively. The components are arranged symmetrically. Each of the two sets of pressure-sensing holes 6 has a pressure-conducting tube inside. The differential pressure sensor 7 and the vortex frequency signal processing circuit 8 are both installed in the sealed housing 4. The differential pressure sensor 7 is connected to the vortex frequency signal processing circuit 8. The top of each of the two sets of pressure-conducting lines 9 is connected to the differential pressure sensor 7. The bottom of each of the two sets of pressure-conducting lines 9 passes through the vortex generator 5. The bottom of each of the two sets of pressure-conducting lines 9 extends into the pressure-conducting tubes inside the two sets of pressure-sensing holes 6. The waterproof mechanism is installed on the sealed housing 4 to maintain the air pressure inside the sealed housing 4.

[0044] The waterproof mechanism includes a liquid level sensor 10, an exhaust pipe 11, an electric cylinder 12, a piston 13, an electric control valve 14, an electric control valve 2 15, and an air supply pipe 16. The liquid level sensor 10 is installed in a sealed housing 4. The exhaust pipe 11 is installed on the sealed housing 4. The electric cylinder 12 is fixedly installed in the exhaust pipe 11. The piston 13 is slidably installed in the exhaust pipe 11, and the top of the electric cylinder 12 is connected to the piston 13. The electric control valve 14 and the electric control valve 2 15 are both installed on the top of the exhaust pipe 11, and the electric control valve 14 communicates with the interior of the sealed housing 4 through the air supply pipe 16.

[0045] The adjustment mechanism includes a vortex generator sleeve 17, an electric cylinder 2 19, a bracket 20, a bonding mechanism, and a support mechanism. The vortex generator sleeve 17 is slidably mounted on the vortex generator 5. The bracket 20 is fixedly installed in the sealed outer shell 4. The electric cylinder 2 19 is installed at the bottom of the bracket 20, and the bottom of the electric cylinder 2 19 is fixedly connected to the vortex generator sleeve 17. The bonding mechanism is installed at the bottom of the vortex generator sleeve 17. The support mechanism is installed on the flow pipe 1. A bonding plate 5 36 is provided on the top of the vortex generator sleeve 17.

[0046] The bonding mechanism includes a bonding plate 21 and a bonding plate 22. The bonding plate 21 is installed at the bottom of the vortex generator sleeve 17, and the bonding plate 22 is installed at the bottom of the bonding plate 21. Both the bonding plate 21 and the bonding plate 22 are in sliding contact with the vortex generator 5.

[0047] The support mechanism includes a second sealed housing 26, a cylinder 27, a fourth bonding plate 28, a second exhaust pipe 29, a third electric cylinder 30, a second piston 31, a third electric control valve 32, and a fourth electric control valve 33. The second sealed housing 26 is installed on the flow pipe 1, the cylinder 27 is installed in the second sealed housing 26, the fourth bonding plate 28 is installed on the cylinder 27, the second exhaust pipe 29 is installed on the second sealed housing 26, the third electric cylinder 30 is fixedly installed in the second exhaust pipe 29, the second piston 31 is slidably installed in the second exhaust pipe 29, and both the third electric control valve 32 and the fourth electric control valve 33 are installed on the second exhaust pipe 29. The third electric control valve 32 is connected to the interior of the cylinder 27 through a connecting pipe.

[0048] The cleaning mechanism includes two sets of nozzles 34 and two sets of connectors 35. Both sets of nozzles 34 and connectors 35 are installed on the flow pipe 1. The two sets of nozzles 34 correspond to the pressure-sensing holes 6 at the front and rear of the vortex generator 5, respectively. The two sets of connectors 35 are connected to the two sets of nozzles 34, respectively.

[0049] The ends of both sets of nozzles 34 are arc-shaped and flush with the inner wall of the flow pipe 1.

[0050] The flow pipe 1 is installed on the liquid delivery pipeline through two sets of connecting flanges 2. The second solenoid valve 15 is opened, the first solenoid cylinder 12 contracts, causing the first piston 13 to move downwards, drawing air into the exhaust pipe 11. Then, the second solenoid valve 15 is closed, and the first solenoid valve 14 is opened. The first solenoid cylinder 12 extends, causing the first piston 13 to move upwards, venting air into the sealing housing 4. This process is repeated to maintain the liquid level in the sealing housing 4 below the liquid level sensor 10. The liquid then flows through the flow pipe 1, alternately generating and separating vortices in front of and behind the vortex generator 5, subsequently creating alternating pulses in front of and behind the flow pipe 1. The dynamic differential pressure is guided to the differential pressure sensor 7 through two sets of pressure sensing holes 6 and two sets of pressure-feeding lines 9. The differential pressure sensor 7 detects the differential pressure pulsation frequency, and then the differential pressure pulsation frequency detected by the differential pressure sensor 7 is processed by the vortex frequency signal processing circuit 8 to detect the flow rate. When detecting the flow rate of liquids with low flow velocity, the electric cylinder 19 extends, causing the vortex generator sleeve 17 to descend and align the perforation 18 on the vortex generator sleeve 17 with the pressure sensing hole 6 on the vortex generator body 5. This reduces the flow area of ​​the liquid in the flow pipe 1, increasing the flow velocity of the liquid passing through the flow pipe 1 and ensuring the vortex generation... Alternating pulsating differential pressure is generated in front of and behind body 5. As the vortex generator sleeve 17 descends, the electric cylinder 30 contracts, drawing air out of cylinder 27. This causes cylinder 27 to lower the bonding plate 28, creating space for bonding plates 21 and 22. When the perforation 18 on the vortex generator sleeve 17 aligns with the pressure-sensing hole 6 on the vortex generator 5, the top of bonding plate 21 is flush with the bottom arc surface inside the flow pipe 1, and the bottom of bonding plate 36 is flush with the top arc surface inside the flow pipe 1. Simultaneously, the descent of the vortex generator sleeve 17 scrapes off the deposits on the surface of the vortex generator 5. After resetting, the bottom of the second bonding plate 22 is made flush with the arc surface of the top of the flow pipe 1. The third electric cylinder 30 extends, causing the second piston 31 to discharge air into the cylinder 27. The extension of the cylinder 27 resets the fourth bonding plate 28, maintaining the flatness of the bottom of the flow pipe 1 and ensuring the stability of the liquid flow through the flow pipe 1. After the equipment has been used for a long time, the two sets of connectors 35 are connected to the drainage equipment. The liquid used for flushing is discharged into the two sets of connectors 35, and then the liquid is sprayed into the pressure-sensing holes 6 at the front and rear of the vortex generator 5 through the two sets of nozzles 34 to clean the residue in the pressure-sensing holes 6, thereby improving the practicality of the equipment.

[0051] Example 2: As Figures 1 to 11 As shown, a differential pressure detection device for both sides of a pipe includes a detection mechanism; it also includes an adjustment mechanism and a cleaning mechanism, both of which are installed on the detection mechanism.

[0052] The detection mechanism detects the flow rate of liquids at normal flow rates, the adjustment mechanism works in conjunction with the detection mechanism to detect the flow rate of liquids at low flow rates, and the cleaning mechanism cleans the detection mechanism.

[0053] The detection mechanism includes a flow pipe 1, two sets of connecting flanges 2, a sealing housing 4, two sets of vortex generators 5, a differential pressure sensor 7, a vortex frequency signal processing circuit 8, a pressure-sensing pipeline 9, and a waterproof mechanism. The two sets of connecting flanges 2 are respectively installed on both ends of the flow pipe 1, and each set of connecting flanges 2 is provided with a sealing gasket groove 3. The sealing housing 4 is installed on the flow pipe 1. The vortex generators 5 are installed in the flow pipe 1 and the sealing housing 4. The vortex generators 5 are provided with two sets of pressure-sensing holes 6, located at the front and rear of the vortex generators 5, respectively. The components are arranged symmetrically. Each of the two sets of pressure-sensing holes 6 has a pressure-conducting tube inside. The differential pressure sensor 7 and the vortex frequency signal processing circuit 8 are both installed in the sealed housing 4. The differential pressure sensor 7 is connected to the vortex frequency signal processing circuit 8. The top of each of the two sets of pressure-conducting lines 9 is connected to the differential pressure sensor 7. The bottom of each of the two sets of pressure-conducting lines 9 passes through the vortex generator 5. The bottom of each of the two sets of pressure-conducting lines 9 extends into the pressure-conducting tubes inside the two sets of pressure-sensing holes 6. The waterproof mechanism is installed on the sealed housing 4 to maintain the air pressure inside the sealed housing 4.

[0054] The waterproof mechanism includes a liquid level sensor 10, an exhaust pipe 11, an electric cylinder 12, a piston 13, an electric control valve 14, an electric control valve 2 15, and an air supply pipe 16. The liquid level sensor 10 is installed in a sealed housing 4. The exhaust pipe 11 is installed on the sealed housing 4. The electric cylinder 12 is fixedly installed in the exhaust pipe 11. The piston 13 is slidably installed in the exhaust pipe 11, and the top of the electric cylinder 12 is connected to the piston 13. The electric control valve 14 and the electric control valve 2 15 are both installed on the top of the exhaust pipe 11, and the electric control valve 14 communicates with the interior of the sealed housing 4 through the air supply pipe 16.

[0055] The adjustment mechanism includes a vortex generator sleeve 17, an electric cylinder 19, a bracket 20, and a bonding mechanism. The vortex generator sleeve 17 is slidably mounted on the vortex generator 5. The bracket 20 is fixedly installed in the sealed outer shell 4. The electric cylinder 19 is installed at the bottom of the bracket 20, and the bottom of the electric cylinder 19 is fixedly connected to the vortex generator sleeve 17. The bonding mechanism is installed at the bottom of the vortex generator sleeve 17. A bonding plate 36 is provided on the top of the vortex generator sleeve 17.

[0056] The bonding mechanism includes a fixing frame 23, a heating element 24, and a memory metal bonding plate 25. The heating element 24 is installed inside the sealed outer shell 4 through the fixing frame 23. The memory metal bonding plate 25 is installed at the bottom of the vortex generator sleeve 17, and the memory metal bonding plate 25 is in sliding contact with the vortex generator 5.

[0057] The support mechanism includes a second sealed housing 26, a cylinder 27, a fourth bonding plate 28, a second exhaust pipe 29, a third electric cylinder 30, a second piston 31, a third electric control valve 32, and a fourth electric control valve 33. The second sealed housing 26 is installed on the flow pipe 1, the cylinder 27 is installed in the second sealed housing 26, the fourth bonding plate 28 is installed on the cylinder 27, the second exhaust pipe 29 is installed on the second sealed housing 26, the third electric cylinder 30 is fixedly installed in the second exhaust pipe 29, the second piston 31 is slidably installed in the second exhaust pipe 29, and both the third electric control valve 32 and the fourth electric control valve 33 are installed on the second exhaust pipe 29. The third electric control valve 32 is connected to the interior of the cylinder 27 through a connecting pipe.

[0058] The cleaning mechanism includes two sets of nozzles 34 and two sets of connectors 35. Both sets of nozzles 34 and connectors 35 are installed on the flow pipe 1. The two sets of nozzles 34 correspond to the pressure-sensing holes 6 at the front and rear of the vortex generator 5, respectively. The two sets of connectors 35 are connected to the two sets of nozzles 34, respectively.

[0059] The ends of both sets of nozzles 34 are arc-shaped and flush with the inner wall of the flow pipe 1.

[0060] The flow pipe 1 is installed on the liquid delivery pipeline through two sets of connecting flanges 2. When the second solenoid valve 15 is opened, the first solenoid cylinder 12 contracts, causing the first piston 13 to move downwards, drawing air into the exhaust pipe 11. Then, the second solenoid valve 15 is closed, and the first solenoid valve 14 is opened. The first solenoid cylinder 12 extends, causing the first piston 13 to move upwards, venting air into the sealing housing 4. This process is repeated to maintain the liquid level in the sealing housing 4 below the liquid level sensor 10. The liquid then flows through the flow pipe 1, alternately generating and separating vortices in front of and behind the vortex generator 5, thus creating an alternating pulsating differential pressure in front of and behind the flow pipe 1. This differential pressure is controlled by two sets of pressure sensing holes 6 in conjunction with two sets of pressure taps. Pipeline 9 guides the alternating pulsating differential pressure to differential pressure sensor 7, allowing sensor 7 to detect the differential pressure pulsation frequency. The vortex frequency signal processing circuit 8 then processes the detected frequency to determine the flow rate. When detecting the flow rate of a low-velocity liquid, the extension of electric cylinder 19 lowers the vortex generator sleeve 17, aligning the perforation 18 on sleeve 17 with the pressure sensing hole 6 on the vortex generator 5. This reduces the flow area of ​​the liquid in the flow pipe 1, increasing the flow velocity and ensuring alternating pulsating differential pressure is generated before and after the vortex generator 5. Furthermore, as the vortex generator sleeve 17 descends, the shape memory metal sticker... As the liquid washes over the plate, the temperature of the plate 25 decreases, causing it to bend upwards into an arc shape. Simultaneously, the electric cylinder 30 contracts, drawing air out of the cylinder 27. This causes the cylinder 27 to lower the plate 28, creating space for the shape memory metal plate 25. When the perforation 18 on the vortex generator sleeve 17 aligns with the pressure-sensing hole 6 on the vortex generator 5, the descent of the vortex generator sleeve 17 scrapes off any adhering material from the surface of the vortex generator 5. At the same time, the top of the shape memory metal plate 25 becomes flush with the bottom arc surface of the flow pipe 1, and the bottom of the plate 36 becomes flush with the top arc surface of the flow pipe 1. After the vortex generator sleeve 17 resets, the heating element 24 heats the shape memory metal plate. The bonding plate 25 is heated to form a downward-curved arc plate, so that the bottom of the memory metal bonding plate 25 is flush with the arc surface of the top of the flow pipe 1. The extension of the electric cylinder 30 causes the piston 21 to discharge air into the cylinder 27. The extension of the cylinder 27 causes the bonding plate 4 28 to return to its original position, maintaining the flatness of the bottom of the flow pipe 1 and ensuring the stability of the liquid flow through the flow pipe 1. After the equipment has been used for a long time, the two sets of connectors 35 are connected to the drainage equipment. The liquid used for flushing is discharged into the two sets of connectors 35, and then the liquid is sprayed into the pressure-sensing holes 6 at the front and rear of the vortex generator 5 through the two sets of nozzles 34 to clean the residue in the pressure-sensing holes 6, thereby improving the practicality of the equipment.

[0061] A method for detecting differential pressure across a pipe to measure the flow rate of a liquid includes the following steps:

[0062] S1. Install the flow pipe 1 onto the liquid delivery pipeline through two sets of connecting flanges 2;

[0063] S2. By opening the second electric control valve 15, the first electric cylinder 12 contracts, causing the first piston 13 to move downward and draw air into the exhaust pipe 11. Then, the second electric control valve 15 is closed, and the first electric control valve 14 is opened. By extending the first electric cylinder 12, the first piston 13 moves upward and discharges air into the sealing housing 4. The above steps are repeated to keep the liquid level in the sealing housing 4 below the liquid level sensor 10.

[0064] S3. Liquid flows through the flow pipe 1 and alternately generates and separates vortices in front of and behind the vortex generator 5, thereby generating alternating pulsating differential pressure in front of and behind the flow pipe 1. The alternating pulsating differential pressure is guided to the differential pressure sensor 7 through two sets of pressure sensing holes 6 and two sets of pressure tapping lines 9, so that the differential pressure sensor 7 can detect the differential pressure pulsation frequency. Then, the differential pressure pulsation frequency detected by the differential pressure sensor 7 is processed by the vortex frequency signal processing circuit 8, and the flow rate is then detected.

[0065] S4. When detecting the flow rate of a liquid with a low flow rate, the extension of the electric cylinder 19 causes the vortex generator sleeve 17 to descend, and aligns the perforation 18 on the vortex generator sleeve 17 with the pressure sensing hole 6 on the vortex generator 5. This reduces the flow area of ​​the liquid in the flow pipe 1, increases the flow rate of the liquid passing through the flow pipe 1, and ensures that alternating pulsating differential pressure is generated in front of and behind the vortex generator 5.

[0066] S5. When the vortex generator sleeve 17 descends, the electric cylinder 30 retracts to draw out the air from the cylinder 27, which in turn causes the cylinder 27 to drive the bonding plate 4 28 to descend, leaving space for the bonding mechanism. When the perforation 18 on the vortex generator sleeve 17 aligns with the pressure sensing hole 6 on the vortex generator 5, the descent of the vortex generator sleeve 17 scrapes off the adhering material on the surface of the vortex generator 5. At the same time, the bonding mechanism, in conjunction with the bonding plate 5 36, fills the gaps at the bottom and top of the flow tube 1. After the vortex generator sleeve 17 is reset, the bonding mechanism fills the gap at the top of the flow tube 1. The electric cylinder 30 extends, causing the piston 2 31 to discharge air into the cylinder 27. The extension of the cylinder 27 resets the bonding plate 4 28, maintaining the flatness of the bottom of the flow tube 1 and ensuring the stability of the liquid flowing through the flow tube 1.

[0067] S6. After the equipment has been used for a long time, connect the two sets of connectors 35 to the drainage equipment. Drain the liquid used for flushing into the two sets of connectors 35, and then spray the liquid into the pressure-sensing holes 6 at the front and rear of the vortex generator 5 through the two sets of nozzles 34 to clean the residue in the pressure-sensing holes 6.

[0068] The main functions achieved by this invention are:

[0069] 1. By adjusting the size of the vortex generator through the vortex generator sleeve, the flow area of ​​the liquid in the flow pipe is adjusted, thereby adjusting the flow rate of the liquid and ensuring the stability of the equipment.

[0070] 2. By cleaning impurities on the surface of the vortex generator during its lifting and lowering process, combined with cleaning the pressure-sensing holes using nozzles, the accuracy of the equipment is ensured.

[0071] 3. The fitting mechanism ensures smooth liquid flow through the flow pipe, thereby reducing interference during equipment testing.

[0072] The differential pressure detection method and device for both sides of a pipe of the present invention are all common mechanical methods in terms of installation, connection or setting. Any method that can achieve the beneficial effect can be implemented. The differential pressure sensor 7 and the vortex frequency signal processing circuit 8 are both waterproof. The vortex generator 5, differential pressure sensor 7, vortex frequency signal processing circuit 8, pressure tapping line 9, liquid level sensor 10, electric cylinder 12, electric control valve 14, electric control valve 25, electric cylinder 29, heating element 24, cylinder 27, electric cylinder 30, electric control valve 32 and electric control valve 43 of the differential pressure detection method and device for both sides of a pipe of the present invention are commercially available. Technicians in the industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0073] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A differential pressure detection device for both sides of a pipe, comprising a detection mechanism; characterized in that, It also includes an adjustment mechanism and a cleaning mechanism, both of which are installed on the testing mechanism; The detection mechanism detects the flow rate of liquids at normal flow rates, the adjustment mechanism works in conjunction with the detection mechanism to detect the flow rate of liquids at low flow rates, and the cleaning mechanism cleans the detection mechanism. The detection mechanism includes a flow tube (1), a sealed outer shell (4), and two sets of vortex generators (5), with the vortex generators (5) installed in the flow tube (1) and the sealed outer shell (4); The adjustment mechanism includes a vortex generator sleeve (17), an electric cylinder (29), a bracket (20), a bonding mechanism A or a bonding mechanism B, and a support mechanism. The vortex generator sleeve (17) is slidably mounted on the vortex generator (5). The bracket (20) is fixedly installed in the sealed outer shell (4). The electric cylinder (29) is installed at the bottom of the bracket (20), and the bottom of the electric cylinder (29) is fixedly connected to the vortex generator sleeve (17). The bonding mechanism is installed at the bottom of the vortex generator sleeve (17). The support mechanism is installed on the flow pipe (1). The top of the vortex generator sleeve (17) is provided with a bonding plate (36). The bonding mechanism A includes bonding plate one (21) and bonding plate two (22). Bonding plate one (21) is installed at the bottom of the vortex generator sleeve (17), and bonding plate two (22) is installed at the bottom of bonding plate one (21). Both bonding plate one (21) and bonding plate two (22) are in sliding contact with the vortex generator (5). The bonding mechanism B includes a fixing frame (23), a heating element (24), and a memory metal bonding plate (25). The heating element (24) is installed inside the sealed outer shell (4) through the fixing frame (23). The memory metal bonding plate (25) is installed at the bottom of the vortex generator sleeve (17), and the memory metal bonding plate (25) and the vortex generator (5) are in sliding contact. The support mechanism includes a second sealed housing (26), a cylinder (27), a fourth bonding plate (28), a second exhaust pipe (29), a third electric cylinder (30), a second piston (31), a third electric control valve (32), and a fourth electric control valve (33). The second sealed housing (26) is installed on the flow pipe (1), the cylinder (27) is installed in the second sealed housing (26), the fourth bonding plate (28) is installed on the cylinder (27), the second exhaust pipe (29) is installed on the second sealed housing (26), the third electric cylinder (30) is fixedly installed in the second exhaust pipe (29), the second piston (31) is slidably installed in the second exhaust pipe (29), the third electric control valve (32) and the fourth electric control valve (33) are both installed on the second exhaust pipe (29), and the third electric control valve (32) is connected to the inside of the cylinder (27) through a connecting pipe.

2. The differential pressure detection device across a pipe as described in claim 1, characterized in that, The detection mechanism also includes two sets of connecting flanges (2), a sealing shell (4), two sets of vortex generators (5), a differential pressure sensor (7), a vortex frequency signal processing circuit (8), a pressure-sensing pipeline (9), and a waterproof mechanism. The two sets of connecting flanges (2) are respectively installed on both ends of the flow pipe (1), and both sets of connecting flanges (2) are provided with sealing gasket grooves (3). The sealing shell (4) is installed on the flow pipe (1). The vortex generator (5) is provided with two sets of pressure-sensing holes (6). The two sets of pressure-sensing holes (6) are located at the front and rear of the vortex generator (5) respectively, and are symmetrically distributed. Pressure-conducting pipes are provided inside the pressure-sensing holes (6). The differential pressure sensor (7) and the vortex frequency signal processing circuit (8) are installed in the sealed housing (4). The differential pressure sensor (7) is connected to the vortex frequency signal processing circuit (8). The tops of the two sets of pressure-conducting lines (9) are connected to the differential pressure sensor (7). The bottoms of the two sets of pressure-conducting lines (9) pass through the vortex generator (5). The bottoms of the two sets of pressure-conducting lines (9) extend into the pressure-conducting pipes inside the two sets of pressure-sensing holes (6). The waterproof mechanism is installed on the sealed housing (4) to maintain the air pressure inside the sealed housing (4).

3. The differential pressure detection device across a pipe as described in claim 2, characterized in that, The waterproof mechanism includes a liquid level sensor (10), an exhaust pipe (11), an electric cylinder (12), a piston (13), an electric control valve (14), an electric control valve (15), and an air supply pipe (16). The liquid level sensor (10) is installed in the sealed housing (4). The exhaust pipe (11) is installed on the sealed housing (4). The electric cylinder (12) is fixedly installed in the exhaust pipe (11). The piston (13) is slidably installed in the exhaust pipe (11). The top of the electric cylinder (12) is connected to the piston (13). The electric control valve (14) and the electric control valve (15) are both installed on the top of the exhaust pipe (11). The electric control valve (14) is connected to the interior of the sealed housing (4) through the air supply pipe (16).

4. The differential pressure detection device across a pipe as described in claim 2, characterized in that, The cleaning mechanism includes two sets of nozzles (34) and two sets of connectors (35). Both sets of nozzles (34) and connectors (35) are installed on the flow pipe (1). The two sets of nozzles (34) correspond to the pressure-sensing holes (6) at the front and rear of the vortex generator (5), respectively. The two sets of connectors (35) are connected to the two sets of nozzles (34).

5. The differential pressure detection device across a pipe as described in claim 4, characterized in that, The ends of both sets of nozzles (34) are arc-shaped and flush with the inner wall of the flow pipe (1).

6. A method for detecting differential pressure across a pipe, characterized in that, The flow rate of liquid is detected using the differential pressure detection device across a pipe as described in any one of claims 1 to 5, comprising the following steps: S1. Install the flow pipe (1) onto the liquid delivery pipeline through two sets of connecting flanges (2); S2. By opening the second electric control valve (15), the first electric cylinder (12) contracts, causing the first piston (13) to move downward and draw air into the exhaust pipe (11). Then, the second electric control valve (15) is closed, and the first electric control valve (14) is opened. By extending the first electric cylinder (12), the first piston (13) moves upward and discharges air into the first sealed housing (4). The above steps are repeated to keep the liquid level in the first sealed housing (4) below the liquid level sensor (10). S3. Liquid flows through the flow pipe (1) and alternately generates and separates vortices in front of and behind the vortex generator (5). Then, alternating pulsating differential pressure is generated in front of and behind the flow pipe (1). The alternating pulsating differential pressure is guided to the differential pressure sensor (7) through two sets of pressure sensing holes (6) and two sets of pressure tapping lines (9), so that the differential pressure sensor (7) detects the differential pressure pulsation frequency. Then, the differential pressure pulsation frequency detected by the differential pressure sensor (7) is processed by the vortex frequency signal processing circuit (8) to detect the flow rate. S4. When detecting the flow rate of a liquid with a low flow rate, the electric cylinder (19) extends to lower the vortex generator sleeve (17) and align the perforation (18) on the vortex generator sleeve (17) with the pressure sensing hole (6) on the vortex generator (5), thereby reducing the flow area of ​​the liquid in the flow pipe (1) and increasing the flow rate of the liquid passing through the flow pipe (1), ensuring that alternating pulsating differential pressure is generated in front of and behind the vortex generator (5). S5. When the vortex generator sleeve (17) descends, the electric cylinder three (30) contracts, drawing out the air from the cylinder (27), which in turn causes the cylinder (27) to drive the bonding plate four (28) to descend, leaving space for the bonding mechanism. When the perforation (18) on the vortex generator sleeve (17) aligns with the pressure-sensing hole (6) on the vortex generator (5), the descent of the vortex generator sleeve (17) scrapes off the adhering material on the surface of the vortex generator (5), and the bonding mechanism cooperates. The bonding plate five (36) fills the gaps at the bottom and top of the flow tube (1). After the vortex generator sleeve (17) is reset, the bonding mechanism fills the gap at the top of the flow tube (1). The electric cylinder three (30) extends, and the piston two (31) discharges air into the cylinder (27). The cylinder (27) extends, and the bonding plate four (28) is reset, maintaining the flatness of the bottom of the flow tube (1) and ensuring the stability of the liquid flowing through the flow tube (1). S6. After the equipment has been used for a long time, connect the two sets of connectors (35) to the drainage equipment, drain the liquid used for flushing into the two sets of connectors (35), and then spray the liquid into the pressure-sensing holes (6) at the front and rear of the vortex generator (5) through the two sets of nozzles (34) to clean the residue in the pressure-sensing holes (6).

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