Automatic exhaust type piezometer tube monitoring device

Abstract

The invention provides an automatic exhaust type piezometric tube monitoring device, belongs to the technical field of water pressure monitoring, and can at least partially solve the problems that the existing piezometric tubes of all hydropower stations usually adopt automatic measurement, the measurement frequency is high, and manual pressure relief cannot meet the measurement requirements; in order to solve the problems that in the prior art, in the prior art, in the prior art, water flow can be discharged from a water outlet along with gas during pressure relief, and the measurement result is affected, the device comprises an exhaust device connected with a pressure measuring pipe, and the exhaust device is provided with a lifting rod, a controller, a conducting strip, a device pressure meter, an atmospheric pressure meter, an electromagnetic valve and a breathable water filtering film. According to the invention, automatic exhaust before measurement can be realized or irregular exhaust can be realized according to the air pressure influence condition, and the water pressure in the pressure measuring pipe is ensured not to leak during exhaust, so that the influence of the air pressure and the pressure relief process on the water pressure measuring result is reduced, and the observation efficiency, the standardization and the data trueness of the air-containing pressure measuring pipe are improved.

Description

Technical Field

[0001] This invention belongs to the field of water pressure monitoring technology, specifically relating to an automatic venting type pressure monitoring device. Background Technology

[0002] According to current technical requirements for safety monitoring of water conservancy and hydropower projects, piezometers need to be installed in the dam gallery or grouting tunnel to monitor the internal water pressure of the dam body, foundation, and abutments. However, due to various factors, some piezometers are prone to generating large amounts of gas, resulting in pressure readings significantly higher than the actual water pressure. This leads to distorted readings that cannot accurately reflect the true water pressure inside the hydraulic structures, hindering data analysis and safety assessment of the dam and its associated structures. The power standard DL / T 1558-2016, "Operation and Maintenance Procedures for Dam Safety Monitoring Systems," requires that "when there is significant air pressure in the piezometer, the pressure should be released before measurement." Therefore, for piezometers with air pressure, depressurization and venting are necessary before measurement.

[0003] However, currently, the pressure gauges of various hydropower stations are usually measured automatically, with a high measurement frequency. Manual depressurization cannot meet the measurement requirements. In addition, during depressurization, water flow will leak out from the drain outlet along with the gas, which will also directly affect the measurement results. Therefore, we propose an automatic venting pressure gauge monitoring device. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art, and to provide an automatic venting type pressure monitoring device.

[0005] This invention provides an automatic venting type pressure monitoring device, including a venting device connected to a pressure measuring tube. The venting device has a cavity with a liquid phase region and a gas phase region inside. The venting device includes at least a first side pipe and a second side pipe, and the venting device is provided with: A lifting rod is movably mounted inside the upper part of the exhaust device, with the upper end of the lifting rod extending to the outside of the exhaust device, and a water level probe being provided at the lower end of the lifting rod. A controller is located at the upper end of the exhaust device and is connected to the lifting rod via an actuator to control the lifting and lowering action of the lifting rod during monitoring. A pressure gauge is installed inside the upper part of the exhaust device and fixed to the inner wall of the exhaust device; An atmospheric pressure gauge is installed at the upper end of the first side pipe section on one side of the exhaust device; A solenoid valve is installed at the inlet of the first side pipe to control exhaust during monitoring. A breathable and water-filtering membrane is disposed on the side of the solenoid valve facing the exhaust device and located in the flow channel between the solenoid valve and the cavity, so as to achieve gas permeation and moisture blocking during the exhaust process.

[0006] Furthermore, an instrument cable is installed inside the second side tube on the other side of the exhaust device. The opening of the side tube is provided with a cable sealing port. The instrument cable is electrically connected to the conductive sheet and the pressure gauge of the device, and is led out through the cable sealing port.

[0007] Specifically, the breathable water-filtering membrane is an expanded polytetrafluoroethylene membrane, and the exhaust device is provided with a conductive sheet. The conductive sheet is disposed at the upper part of the exhaust device and fixed on the inner wall of the exhaust device to form a stable conduction when the liquid rises and comes into contact with it.

[0008] Specifically, the exhaust device, the lifting rod, and the water level probe are all made of stainless steel.

[0009] Preferably, the side of the lifting rod is covered with an insulating protective layer, which is one of polypropylene, polyethylene, chlorinated polyethylene or polyvinyl chloride.

[0010] Specifically, the lower part of the exhaust device is provided with an external thread for connecting to the pressure measuring pipe.

[0011] Furthermore, a pressure gauge for displaying the chamber pressure is provided above the exhaust device.

[0012] Furthermore, the controller, the solenoid valve, the conductive plate, the device pressure gauge, and the atmospheric pressure gauge are all connected to an external intelligent processor.

[0013] Furthermore, the intelligent processor is wired to the controller, the solenoid valve, the conductive plate, the device pressure gauge, and the atmospheric pressure gauge to ensure communication reliability during operation.

[0014] Specifically, a dynamic sealing assembly is provided between the exhaust device and the lifting rod to maintain the sealing of the exhaust device during the lifting and lowering of the lifting rod.

[0015] The beneficial effects of this invention are as follows: Equipped with a lifting rod, conductive plate, pressure gauge, and atmospheric pressure gauge, this device can automatically vent air before measurement or vent air at irregular intervals depending on the air pressure. While venting air, it ensures that the water pressure inside the pressure measuring tube does not leak out, thereby reducing the impact of air pressure and the depressurization process on the water pressure measurement results. This improves the observation efficiency, standardization, and data accuracy of air-containing pressure measuring tubes. Attached Figure Description

[0016] Figure 1 This is a connection diagram of an automatic exhaust-type pressure monitoring device according to a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the intelligent processor connection of an automatic exhaust-type pressure monitoring device according to a specific embodiment of the present invention.

[0017] Among them, 1 is the exhaust device, 2 is the lifting rod, 3 is the water level probe, 4 is the conductive sheet, 5 is the controller, 6 is the breathable filter membrane, 7 is the solenoid valve, 8 is the pressure gauge, 9 is the device pressure gauge, 10 is the atmospheric pressure gauge, 11 is the cable sealing port, 12 is the instrument cable, and 13 is the external thread. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1 As shown in the figure, an automatic venting type pressure measuring tube monitoring device provided by a specific embodiment of the present invention includes an venting device 1 connected to the pressure measuring tube. The venting device 1 forms a cavity with a liquid phase region and a gas phase region inside. The venting device 1 includes at least a first side pipe and a second side pipe. The venting device 1 is provided with: a lifting rod 2, which is movably disposed inside the upper end of the venting device 1, with the upper end of the lifting rod 2 extending to the outside of the venting device 1, and a water level probe 3 disposed at the lower end of the lifting rod 2; and a controller 5, which is disposed at the upper end of the venting device 1 and connected to the lifting rod 2 through an actuator, for use in controlling the monitoring process. The device controls the lifting and lowering action of the lifting rod 2; a pressure gauge 9 is installed inside the upper part of the exhaust device 1 and fixed on the inner wall of the exhaust device 1 to measure the internal pressure of the cavity of the exhaust device 1; an atmospheric pressure gauge 10 is installed on the upper end of the first side pipe on one side of the exhaust device 1 to measure atmospheric pressure; a solenoid valve 7 is installed at the opening of the first side pipe to control the exhaust during the monitoring process; a breathable water-filtering membrane 6 is installed on the side of the solenoid valve 7 facing the exhaust device 1 and located in the flow channel between the solenoid valve 7 and the cavity to achieve gas permeation and moisture blocking during the exhaust process.

[0020] Specifically, when there is air pressure in the pressure measuring tube, some gas accumulates inside the upper part of the exhaust device 1, and the water level line is located in the lower middle position of the exhaust device 1. The intelligent processor has a built-in program algorithm. The pressure measured by the device pressure gauge 9 is P9, and the pressure measured by the atmospheric pressure gauge 10 is P10. The built-in program sets the necessary conditions for the solenoid valve 7 to start, that is, the gas height reaches the minimum limit value H. Before the exhaust device 1 is working or in standby mode, the lifting rod 2 is kept in the top position. At this time, the water level probe 3 is located above the inner wall of the exhaust device 1.

[0021] Furthermore, the exhaust device 1 is activated, and the intelligent processor remotely controls the controller 5 to slowly lower the lifting rod 2. The distance from the inner wall of the upper pipe of the exhaust device 1 to the water surface line, i.e., the gas height H1, can be calculated by measuring the descent height of the water level probe 3. When P9 is greater than P10 and H1 is greater than H, the solenoid valve 7 is opened, and the exhaust device 1 begins to work and exhaust gas.

[0022] Furthermore, as the gas in the upper part of the exhaust device 1 is gradually discharged, the water level in the pressure measuring tube gradually rises. To avoid the disturbance caused by the instantaneous contact between water vapor and the conductive plate 4, when the water level is in stable contact with the conductive plate 4 and the continuous conduction time is not less than 5 seconds, the solenoid valve 7 closes, the lifting rod 2 rises to the top position, and the operation of the exhaust device 1 ends.

[0023] Based on the above basic implementation method, an instrument cable 12 is provided inside the second side pipe on the other side of the exhaust device 1. The pipe opening of the side pipe is provided with a cable sealing port 11. The instrument cable 12 is electrically connected to the conductive sheet 4 and the device pressure gauge 9 respectively and is led out through the cable sealing port 11.

[0024] Specifically, a cable sealing port 11 is provided on the side wall of the exhaust device 1. After the instrument cable 12 is connected to the conductive sheet 4 inside the tube and the pressure gauge 9 of the device respectively, it is led out from the cable sealing port 11 to prevent the exhaust device 1 from leaking water or air and to improve the sealing performance.

[0025] In one specific embodiment, the breathable water-filtering membrane 6 is an expanded polytetrafluoroethylene membrane, and the exhaust device 1 is provided with a conductive sheet 4. The conductive sheet 4 is disposed at the upper part of the interior of the exhaust device 1 and fixed on the inner wall of the exhaust device 1 so as to form a stable conduction when the liquid rises and comes into contact with it.

[0026] In this embodiment, the breathable water-filtering membrane 6 is an expanded polytetrafluoroethylene (EPTFE) membrane, which can ensure that water vapor and air molecules can freely pass through the EPTFE microporous membrane, while liquid water droplets cannot pass through.

[0027] Furthermore, the permeable water-filtering membrane 6 is mainly designed to prevent water from leaking out of the pressure measuring tube with the air pressure when the solenoid valve 7 is opened, so as to reduce the impact of the depressurization process on the water pressure measurement results.

[0028] In another specific embodiment, the exhaust device 1, the lifting rod 2, and the water level probe 3 are all made of stainless steel.

[0029] Specifically, using stainless steel can effectively reduce the risk of pitting corrosion and crevice corrosion, and improve the service life of the equipment.

[0030] In one specific embodiment, the side of the lifting rod 2 is covered with an insulating protective layer, which is one of polypropylene, polyethylene, chlorinated polyethylene or polyvinyl chloride.

[0031] In this embodiment, an external thread 13 for connecting to a pressure measuring tube is provided below the exhaust device 1.

[0032] Specifically, the external thread 13 facilitates the disassembly and assembly of the exhaust device 1 and the pressure measuring pipe.

[0033] In another specific embodiment, a pressure gauge 8 is installed above the exhaust device 1. The pressure gauge 8 has an accuracy of not less than 0.4 and its range is 2 to 3 times the maximum pressure value of the pressure measuring tube. The pressure gauge 8 is installed mainly to meet the requirements of industry standards and specifications for manual comparison testing of pressurized pressure measuring tubes.

[0034] Furthermore, such as Figure 2 As shown, the controller 5, solenoid valve 7, conductive plate 4, device pressure gauge 9, and atmospheric pressure gauge 10 are all connected to an external intelligent processor; the intelligent processor is wired to the controller 5, solenoid valve 7, conductive plate 4, device pressure gauge 9, and atmospheric pressure gauge 10 respectively to ensure communication reliability during operation.

[0035] Furthermore, a dynamic sealing assembly is provided between the exhaust device 1 and the lifting rod 2 to maintain the sealing of the exhaust device during the lifting of the lifting rod 2; the dynamic sealing assembly includes a guide for limiting the radial swing of the lifting rod 2 and a first sealing element that forms a circumferential seal around the outer periphery of the lifting rod 2, so that the sealing of the exhaust device 1 is not affected during the lifting of the lifting rod 2; the dynamic sealing assembly is configured to allow axial displacement of the lifting rod 2 and maintain fluid isolation between the cavity and the outside.

[0036] To aid in a better understanding of the present invention, a more comprehensive and specific embodiment is described. In this embodiment, the present invention provides an automatic venting type pressure monitoring device, including a venting device 1 connected to a pressure monitoring tube. The venting device 1 has an internal cavity with a liquid phase region and a gas phase region. The venting device 1 includes at least a first side pipe and a second side pipe. The venting device 1 is equipped with: a lifting rod 2, movably disposed at the upper end of the venting device 1, with the upper end of the lifting rod 2 extending to the outside of the venting device 1, and a water level probe 3 disposed at the lower end of the lifting rod 2; and a controller 5, disposed at the upper end of the venting device 1 and connected to the lifting rod 2 via an actuator. The device includes: a pressure gauge 9, installed inside the upper part of the exhaust device 1 and fixed to the inner wall of the exhaust device 1, for measuring the internal pressure of the cavity of the exhaust device 1; an atmospheric pressure gauge 10, installed on the upper end of the first side pipe on one side of the exhaust device 1, for measuring atmospheric pressure; a solenoid valve 7, installed at the opening of the first side pipe of the exhaust device 1, for controlling the exhaust during the monitoring process; and a breathable water-filtering membrane 6, installed on the side of the solenoid valve 7 facing the exhaust device 1 and located in the flow channel between the solenoid valve 7 and the cavity, for achieving gas permeation and moisture barrier during the exhaust process.

[0037] In this embodiment, an instrument cable 12 is installed inside the second side tube on the other side of the exhaust device 1. The opening of this side tube is provided with a cable sealing port 11. The instrument cable 12 is electrically connected to the conductive sheet 4 and the device pressure gauge 9, and is led out through the cable sealing port 11. The breathable water-filtering membrane 6 is an expanded polytetrafluoroethylene membrane. The exhaust device 1 is provided with a conductive sheet 4, which is located at the upper end of the exhaust device 1 and fixed to the inner wall of the exhaust device 1 to form a stable conduction when the liquid level rises and contacts it. The exhaust device 1, the lifting rod 2, and the water level probe are also included. The head 3 is made of stainless steel; the side of the lifting rod 2 is covered with an insulating protective layer, which is one of polypropylene, polyethylene, chlorinated polyethylene or polyvinyl chloride; the lower part of the exhaust device 1 is provided with an external thread 13 for connecting with the pressure measuring tube; the upper part of the exhaust device 1 is provided with a pressure gauge 8 for displaying the pressure of the cavity, the accuracy of the pressure gauge 8 is not less than 0.4 grade, and its range is 2 to 3 times the maximum pressure value of the pressure measuring tube; the controller 5, solenoid valve 7, conductive plate 4, device pressure gauge 9 and atmospheric pressure gauge 10 are all electrically connected to an external intelligent processor.

[0038] Furthermore, the intelligent processor is wired to the controller 5, solenoid valve 7, conductive plate 4, device pressure gauge 9 and atmospheric pressure gauge 10 respectively to ensure communication reliability during operation; a dynamic sealing component is provided between the exhaust device 1 and the lifting rod 2 to maintain the sealing of the exhaust device 1 during the lifting of the lifting rod 2.

[0039] In summary, the embodiments disclosed herein have at least the following technical effects: Stable exhaust termination criteria with strong anti-interference: The conductive sheet 4 is set as a termination trigger, which requires stable contact with the liquid surface and continuous conduction for ≥5s before the solenoid valve is closed. This filters out instantaneous false signals caused by water vapor / splashing, and improves the reliability and repeatability of the termination criteria. Breathable yet waterproof, significantly reducing measurement disturbances: The inner side of the solenoid valve 7 is equipped with a breathable and water-filtering membrane 6, which allows gas / water vapor to pass through but makes liquid water difficult to pass through; during venting, it effectively suppresses water leakage with the airflow, reduces liquid level fluctuations and pressure transients, and ensures the comparability of readings before and after venting; The entire process is sealed and reliable, with no leakage during lifting: The lifting rod 2 and the upper end adopt a guide + dynamic seal structure to maintain the isolation between the cavity and the external fluid during the lifting process; Sealed cable exit enhances system durability: The side wall cable sealing port 11 and instrument cable 12 achieve sealed exit of sensing / execution signals, preventing air and water leakage at the cable passage, improving the overall weather resistance and long-term stability of the machine, and reducing maintenance frequency; The materials are corrosion-resistant, high-strength, and have a long service life: the exhaust device 1, the lifting rod 2, and the water level probe 3 are all made of stainless steel, which is corrosion-resistant, fatigue-resistant, and has a finely finished surface that minimizes wear of the sealing components; combined with the insulating coating of the lifting rod 2, it reduces the impact of electrochemical corrosion and stray current, thus extending the service life. Wired communication ensures more reliable control and data: The intelligent processor is wired to the controller 5 / solenoid valve 7 / pressure and liquid level signals, which has strong anti-interference ability and low disconnection rate, ensuring the consistency of venting action and data integrity, and facilitating long-term monitoring and traceability; Compliant on-site comparison and maintenance: The pressure gauge 8 is installed on the top to meet the industry standard requirements for manual comparison and verification of pressurized pressure gauges, and the sensor readings can be quickly calibrated on-site. Better measurement chain redundancy and consistency: The device pressure gauge 9 and atmospheric pressure gauge 10 work together to verify each other; at the same time, a local pressure gauge is set up to form three-channel information, which improves the efficiency of anomaly identification and calibration.

[0040] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An automatic venting type pressure monitoring device, characterized in that, The exhaust device includes an exhaust system connected to a pressure measuring tube. The exhaust system has an internal cavity with a liquid phase region and a gas phase region. The exhaust system includes at least a first side pipe and a second side pipe. The exhaust system is equipped with: A lifting rod is movably mounted inside the upper part of the exhaust device, with the upper end of the lifting rod extending to the outside of the exhaust device, and a water level probe being provided at the lower end of the lifting rod. A controller is located at the upper end of the exhaust device and is connected to the lifting rod via an actuator to control the lifting and lowering action of the lifting rod during monitoring. A pressure gauge is installed inside the upper part of the exhaust device and fixed to the inner wall of the exhaust device; An atmospheric pressure gauge is installed on the upper end of the first side pipe on one side of the exhaust device; A solenoid valve is installed at the inlet of the first side pipe to control exhaust during monitoring. A breathable and water-filtering membrane is disposed on the side of the solenoid valve facing the exhaust device and located in the flow channel between the solenoid valve and the cavity, so as to achieve gas permeation and moisture blocking during the exhaust process.

2. The automatic exhaust-type pressure monitoring device according to claim 1, characterized in that, An instrument cable is installed inside the second side pipe on the other side of the exhaust device. The pipe opening of the side pipe is provided with a cable sealing port. The instrument cable is electrically connected to the conductive sheet and the pressure gauge of the device, and is led out through the cable sealing port.

3. The automatic exhaust-type pressure monitoring device according to claim 1, characterized in that, The breathable water-filtering membrane is an expanded polytetrafluoroethylene membrane. The exhaust device is equipped with a conductive sheet, which is disposed at the upper part of the exhaust device and fixed on the inner wall of the exhaust device to form a stable conduction when the liquid level rises and comes into contact with it.

4. The automatic exhaust-type pressure monitoring device according to claim 1, characterized in that, The exhaust device, the lifting rod, and the water level probe are all made of stainless steel.

5. The automatic exhaust-type pressure monitoring device according to claim 1, characterized in that, The side of the lifting rod is covered with an insulating protective layer, which is one of polypropylene, polyethylene, chlorinated polyethylene or polyvinyl chloride.

6. The automatic exhaust-type pressure monitoring device according to claim 1, characterized in that, The exhaust device has an external thread for connecting to a pressure testing pipe at its lower part.

7. The automatic exhaust-type pressure monitoring device according to claim 1, characterized in that, A pressure gauge for displaying the pressure in the cavity is installed above the exhaust device.

8. The automatic exhaust-type pressure monitoring device according to claim 1, characterized in that, The controller, the solenoid valve, the conductive plate, the device pressure gauge, and the atmospheric pressure gauge are all connected to an external intelligent processor.

9. The automatic exhaust-type pressure monitoring device according to claim 8, characterized in that, The intelligent processor is wired to the controller, the solenoid valve, the conductive plate, the device pressure gauge, and the atmospheric pressure gauge to ensure reliable communication during operation.

10. The automatic venting type pressure monitoring device according to any one of claims 1 to 9, characterized in that, A dynamic sealing assembly is provided between the exhaust device and the lifting rod to maintain the airtightness of the exhaust device during the lifting and lowering of the lifting rod.

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