A pipeline pressure detection component

Abstract

The present invention discloses a pipeline pressure detection assembly, comprising a housing, a pressure detection unit and a temperature detection unit disposed within the housing, the temperature detection unit being used to detect temperature changes within the pipeline being detected, the pressure detection unit comprising a detection sensor, one end of the detection sensor being sealed with a pressure-sensitive diaphragm, the pressure-sensitive diaphragm being used to detect changes in pressure within the pipeline being detected, a cavity between the pressure-sensitive diaphragm and the detection sensor being encapsulated with gas having the same pressure as within the pipeline being detected, the other end of the detection sensor being sealed with a double-layer metal diaphragm, the double-layer metal diaphragm being composed of an inner diaphragm and an outer diaphragm, a cavity between the inner diaphragm and the detection sensor being encapsulated with gas having the same pressure as within the pipeline being detected, a cavity being formed between the inner diaphragm and the outer diaphragm, the cavity being encapsulated with gas at standard atmospheric pressure. The present invention has the advantages of compact structure, strong anti-interference capability, high detection accuracy, low cost, safety and reliability, and strong versatility.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of pipeline pressure detection, and in particular to a pipeline pressure detection component. Background Art

[0002] With the rapid development of China's national and industrial economies, natural gas, as a clean energy source, is increasingly becoming a part of the country's energy mix. However, during the construction and operation of gas pipeline networks, accidents such as explosions and fires caused by pipeline leaks are common. The national "Code for Construction and Acceptance of Urban Gas Transmission and Distribution Projects" clearly stipulates pipeline air tightness test acceptance methods and acceptance criteria. However, during the gas pipeline project acceptance process, the quality of pipeline construction is often not effectively assessed due to inappropriate selection of pipeline air tightness test instruments and assessment criteria.

[0003] Underground gas pipelines are particularly concealed, making airtightness testing more challenging. Existing techniques often use U-tube pressure gauges for testing. While they can accurately measure pressure within gas pipelines, the results are affected by many factors, most notably temperature fluctuations. During the airtightness test, the volume of the entire system typically remains constant. In this case, pressure and temperature have a specific physical relationship. A temperature change of 0.1K can cause significant pressure changes during the leak test. These thermal changes directly affect the pressure change in the measured results, resulting in poor repeatability. Temperature is particularly impactful during high-pressure tests, making temperature a crucial factor in leak detection (and airtightness testing). Therefore, using a U-tube for gas pipeline testing still fails to address the impact of temperature on pressure test results, requiring an additional thermometer to monitor temperature.

[0004] Many domestic companies have competed to develop a variety of air tightness testing instruments, but due to problems such as low pressure measurement accuracy, large repeated measurement errors, and serious interference of temperature on measurement accuracy, they still cannot meet the requirements of the "Urban Gas Transmission and Distribution Project Construction and Acceptance Specifications" that the corrected pressure drop should be less than 133pa. Therefore, how to effectively measure and monitor the air tightness of gas pipelines is still a difficult problem that needs to be solved urgently in the gas pipeline project construction and acceptance regulations. Summary of the Invention

[0005] In view of the technical problems existing in the prior art, the present invention provides a pipeline pressure detection component with compact structure, strong anti-interference ability, high detection accuracy, low cost, safety, reliability and strong versatility.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A pipeline pressure detection component includes an outer shell, in which a pressure detection unit and a temperature detection unit are provided, the temperature detection unit is used to detect temperature changes in the pipeline to be detected, the pressure detection unit includes a detection sensor, one end of the detection sensor is sealed with a pressure-sensitive diaphragm, the pressure-sensitive diaphragm is used to sense pressure changes in the pipeline to be detected, the cavity between the pressure-sensitive diaphragm and the detection sensor is encapsulated with gas with the same pressure as that in the pipeline to be detected, the other end of the detection sensor is sealed with a double-layer metal diaphragm, the double-layer metal diaphragm is composed of an inner diaphragm and an outer diaphragm, the cavity between the inner diaphragm and the detection sensor is encapsulated with gas with the same pressure as that in the pipeline to be detected, a cavity is formed between the inner diaphragm and the outer diaphragm, and the cavity encapsulates gas at standard atmospheric pressure.

[0008] As a further improvement of the present invention: the gas volume in the cavity between the inner diaphragm and the outer diaphragm is greater than the gas volume in the cavity between the inner diaphragm and the detection sensor.

[0009] As a further improvement of the present invention: a data processing unit is further provided in the housing, and the data processing unit is used to collect, organize and calculate the detection values ​​of the pressure detection unit and the temperature detection unit and obtain a corrected pressure value.

[0010] As a further improvement of the present invention: it also includes a signal transmission unit, which is used to transmit the pressure value corrected by the data processing unit to the detection terminal or the monitoring platform.

[0011] As a further improvement of the present invention: the shell includes a sealed tube body and an injection molded base, the pressure detection unit and the temperature detection unit are arranged in the sealed tube body, the data processing unit and the signal transmission unit are arranged in the injection molded base, and the pressure detection unit, the temperature detection unit and the data processing unit are electrically connected.

[0012] As a further improvement of the present invention: a heat-insulating glue is provided between the temperature detection unit and the sealed tube body.

[0013] As a further improvement of the present invention: the injection-molded base includes a connecting tube and a plastic base, and the connecting tube and the plastic base are formed by one-time welding using an injection molding process.

[0014] As a further improvement of the present invention: the sealing tube body and the connecting tube are made of metal, and the sealing tube body and the connecting tube are welded into a whole.

[0015] As a further improvement of the present invention: a pressure plate is further provided in the sealed tube body, the pressure plate is arranged on the outside of the outer diaphragm, and the pressure plate is connected to the pressure detection unit through a fixing member, so as to seal the pressure detection unit in the sealed tube body.

[0016] As a further improvement of the present invention: a sealing ring is provided between the outer wall of the pressure detection unit and the inner wall of the sealing tube body.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] 1. The pipeline pressure detection assembly of the present invention integrates the pressure detection unit and the temperature detection unit in a housing. The pressure detection unit includes a detection sensor. One end of the detection sensor is sealed with a pressure-sensitive diaphragm. The cavity between the pressure-sensitive diaphragm and the detection sensor is encapsulated with a gas with the same pressure as the pressure in the pipeline to be detected. The other end of the detection sensor is sealed with a double-layer metal diaphragm. The double-layer metal diaphragm is composed of an inner diaphragm and an outer diaphragm. The cavity between the inner diaphragm and the detection sensor is encapsulated with a gas with the same pressure as the pressure in the pipeline to be detected. Both ends of the detection sensor are encapsulated with Gases with the same pressure can prevent the detection sensor from being damaged due to single-end overload. The cavity between the inner diaphragm and the outer diaphragm is encapsulated with gas at standard atmospheric pressure. The double-layer metal diaphragm at one end of the detection sensor and the isolation form of gas encapsulation, when there is external pressure interference or local pressure disturbance caused by temperature increase, will first affect the gas pressure between the inner diaphragm and the outer diaphragm. The inner diaphragm is a metal diaphragm, which can greatly reduce the impact on the pressure inside the inner diaphragm, reduce the impact of external environmental interference on the detection sensor and the temperature detection unit, and greatly improve the detection accuracy of the pressure detection unit.

[0019] 2. The pipeline pressure detection component of the present invention has an outer shell including a sealed tube body and an injection molded base. The injection molded base includes a connecting tube and a plastic base. The connecting tube and the plastic base are formed by one-time welding using an injection molding process. The sealed tube body and the connecting tube are sealed and connected to form a whole. When the pipeline pressure detection component is installed on the pipeline to be inspected, the entire pressure detection unit is located inside the pipeline to be inspected. The gas in the cavity between the inner diaphragm and the detection sensor will tend to be consistent with the gas pressure and temperature in the pipeline to be inspected after a long period of standing. The pressure detection unit is isolated from the inner wall of the outer shell by a sealing ring. Since plastic has a low thermal conductivity and high strength, the use of a plastic base can effectively avoid the influence of external heat sources of the pipeline to be inspected on the temperature detection unit, effectively reduce the influence of external temperature environmental factors on the detection data, and further improve the accuracy of pipeline pressure detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the present invention in a specific embodiment.

[0021] Figure 2 Schematic diagram of the structure of the pressure detection unit of the present invention in a specific embodiment.

[0022] Figure 3 It is a schematic diagram of the installation of the pressure detection unit and the temperature detection unit in a specific embodiment of the present invention.

[0023] Figure 4 It is a schematic diagram of the installation of the data processing unit and the signal transmission unit in a specific embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the state of the present invention when applied to pipeline pressure detection.

[0025] Legend:

[0026] 1. Pressure detection unit; 2. Temperature detection unit; 3. Data processing unit; 4. Signal transmission unit; 5. Housing; 51. Sealing tube body; 52. Injection molding base; 521. Connecting tube; 522. Plastic base; 6. Inspected pipeline; 7. Communication interface; 8. Detection sensor; 9. Pressure-sensing diaphragm; 10. Inner diaphragm; 11. Outer diaphragm; 12. Pressure plate; 13. Fixing part; 14. Sealing ring; 15. Data cable. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 4 As shown, this embodiment discloses a pipeline pressure detection component, including a shell 5, in which a pressure detection unit 1 and a temperature detection unit 2 are provided. The temperature detection unit 2 is used to detect temperature changes in the detected pipeline 6. The pressure detection unit 1 includes a detection sensor 8. One end of the detection sensor 8 is sealed with a pressure-sensitive diaphragm 9. The pressure-sensitive diaphragm 9 is used to sense pressure changes in the detected pipeline 6. The cavity between the pressure-sensitive diaphragm 9 and the detection sensor 8 is encapsulated with gas with the same pressure as that in the detected pipeline 6. The other end of the detection sensor 8 is sealed with a double-layer metal diaphragm. The double-layer metal diaphragm is composed of an inner diaphragm 10 and an outer diaphragm 11. The cavity between the inner diaphragm 10 and the detection sensor 8 is encapsulated with gas with the same pressure as that in the detected pipeline 6. A cavity is formed between the inner diaphragm 10 and the outer diaphragm 11, and the cavity is encapsulated with gas at standard atmospheric pressure.

[0029] The pipeline pressure detection component of the present invention integrates a pressure detection unit 1 and a temperature detection unit 2 in a housing. The pressure detection unit 1 includes a detection sensor 8. One end of the detection sensor 8 is sealed with a pressure-sensitive diaphragm 9. The cavity between the pressure-sensitive diaphragm 9 and the detection sensor 8 is encapsulated with a gas with the same pressure as that in the detected pipeline 6. The other end of the detection sensor 8 is sealed with a double-layer metal diaphragm. The double-layer metal diaphragm is composed of an inner diaphragm 10 and an outer diaphragm 11. The cavity between the inner diaphragm 10 and the detection sensor 8 is encapsulated with a gas with the same pressure as that in the detected pipeline 6. Both ends of the detection sensor 8 are encapsulated with gas with the same pressure as that in the detected pipeline 6, which can avoid damage to the detection sensor 8 due to single-end overload. The outer diaphragm 11 is welded to the detection sensor 8 using a gauge pressure welding process. The cavity between the inner diaphragm 10 and the outer diaphragm 11 is encapsulated with gas at standard atmospheric pressure. One end of the detection sensor 8 The double-layer metal diaphragm and the isolation form of gas packaging can be seen from the ideal gas equation pV=nRT, where: p is pressure (Pa), V is gas volume (m³), T is temperature (K), n is the amount of gas substance (mol), and R is the molar gas constant (also called universal gas constant) (J / (mol.K)). When there is external pressure interference or local pressure disturbance caused by temperature increase, the cavity between the inner diaphragm 10 and the outer diaphragm 11 encapsulates gas at standard atmospheric pressure, and its pressure is relatively small. Therefore, the gas is highly compressible and easily affected, so it will first affect the gas pressure between the inner diaphragm 10 and the outer diaphragm 11. The inner diaphragm 10 is a metal diaphragm, which can greatly reduce the impact on the pressure inside the inner diaphragm 10, has strong anti-interference ability, reduces the impact of external environmental interference on the detection sensor 8 and the temperature detection unit 2, and greatly improves the detection accuracy of the pressure detection unit 1.

[0030] Furthermore, in a preferred embodiment, the pressure detection unit 1 is made of a small-range differential pressure sensor with high precision, and the temperature detection unit 2 is made of a 5A-level platinum resistance temperature sensor with a detection accuracy of up to 0.01°C. The temperature detection unit 2 is installed in the inner cavity inside the sealed tube body 51 and is tightly connected to the sealed tube body 51 using electronic thermal conductive glue, which is conducive to the rapid transmission of the gas temperature inside the tested pipeline 6 to the temperature sensor.

[0031] In this embodiment, the volume of gas in the cavity between the inner diaphragm 10 and the outer diaphragm 11 is greater than the volume of gas in the cavity between the inner diaphragm 10 and the detection sensor 8. According to the ideal gas equation, pressure and volume are inversely proportional; the larger the volume, the smaller the rate of pressure change. However, pressure / area equals pressure intensity, and the gas pressure in the cavity between the inner diaphragm 10 and the detection sensor 8 is greater. Therefore, a larger gas volume and lower pressure in the cavity between the inner diaphragm 10 and the outer diaphragm 11 result in better filtering of pressure fluctuations.

[0032] In this embodiment, a data processing unit 3 is also provided in the housing 5, which is used to collect, organize, and calculate the detection values ​​of the pressure detection unit 1 and the temperature detection unit 2 and obtain the corrected pressure value; it also includes a signal transmission unit 4, which is used to transmit the corrected pressure value of the data processing unit 3 to an external device.

[0033] Furthermore, in a preferred embodiment, the data processing unit 3 and the signal transmission unit 4 are stacked and mounted on the mounting posts of the injection molded base 52. The signal transmission unit 4 is connected to the communication interface 7 via a data cable 15, employing the CAN communication protocol and a bus topology to communicate with the industrial bus, and transmits the corrected pressure data to a data acquisition device or a detection terminal.

[0034] It should be noted that, in other embodiments, the signal transmission unit 4 may also transmit the corrected pressure value data to the data acquisition device or the detection terminal via wireless transmission.

[0035] In this embodiment, the housing 5 includes a sealed tube body 51 and an injection molded base 52, the pressure detection unit 1 and the temperature detection unit 2 are arranged in the sealed tube body 51, the data processing unit 3 and the signal transmission unit 4 are arranged in the injection molded base 52, and the pressure detection unit 1, the temperature detection unit 2 and the data processing unit 3 are electrically connected.

[0036] Furthermore, in a preferred embodiment, a heat-insulating adhesive is provided between the temperature detection unit 2 and the sealing tube body 51 .

[0037] In this embodiment, the injection molded base 52 includes a connecting tube 521 and a plastic base 522. The connecting tube 521 and the plastic base 522 are welded together at one time using an injection molding process. The sealing tube body 51 and the connecting tube 521 are made of metal. The sealing tube body 51 and the connecting tube 521 are welded into a whole. A sealing ring 14 is provided between the outer wall of the pressure detection unit 1 and the inner wall of the sealing tube body 51.

[0038] In this embodiment of the pipeline pressure detection assembly, the housing 5 includes a sealed tube body 51 and an injection-molded base 52. The injection-molded base 52 includes a connecting tube 521 and a plastic base 522. The connecting tube 521 and the plastic base 522 are welded together in one step using an injection molding process. This ensures both strength and good sealing. The sealed tube body 51 and the connecting tube 521 are sealed together to form a single unit. When the pipeline pressure detection assembly is installed on the pipeline to be detected 6, the entire pressure detection unit 1 is located inside the pipeline to be detected 6. The gas in the cavity between the inner diaphragm 10 and the detection sensor 8 will tend to be consistent with the gas pressure and temperature in the pipeline to be detected 6 after a long period of standing, thereby improving the accuracy of temperature measurement. There is no need to measure the temperature value in the pipeline and the temperature value of the gas in the cavity between the inner diaphragm 10 and the detection sensor 8 separately, or to perform compensation processing. The temperatures tend to be consistent, which can eliminate the error of two-point temperature measurement. Only the temperature measurement error at one point needs to be calibrated. The pressure detection unit 1 is isolated from the inner wall of the outer shell 5 by the sealing ring 14. Since the plastic has a low thermal conductivity and high strength, the use of a plastic base 522 can effectively avoid the influence of the external heat source of the pipeline to be detected 6 on the temperature detection unit 2, and can effectively reduce the influence of external temperature environment factors on the detection data, further improving the accuracy of pipeline pressure detection.

[0039] In this embodiment, the material of the connecting tube 521 is the same as that of the sealing tube body 51, which facilitates reliable welding and packaging of the two. The plastic base 522 uses engineering plastic with low thermal conductivity and high strength. Its outer surface is processed with threads and can be installed on the installation interface of the outer wall of the inspected pipe 6.

[0040] In this embodiment, a pressure plate 12 is further provided in the sealing tube body 51 . The pressure plate 12 is arranged outside the outer diaphragm 11 . The pressure plate 12 is connected to the pressure detection unit 1 via a fixing member 13 , so as to seal the pressure detection unit 1 in the sealing tube body 51 .

[0041] Furthermore, in a preferred embodiment, a pressure plate 12 is installed on the top of the pressure detection unit 1, and the two are pressed against the step of the inner wall of the sealed tube body 51 by a fixing member 13 (such as a screw). A sealing ring 14 is installed between the pressure detection unit 1 and the inner wall of the sealed tube body 51, and is sealed with electronic potting glue, which can completely prevent external liquids, water vapor, etc. from entering the interior of the injection molded base 52, and can effectively protect the data processing unit 3 and the signal transmission unit 4 from interference and damage. The leads of the pressure detection unit 1 and the temperature detection unit 2 are both connected to the data port of the data processing unit 3 along the inner wall of the sealed tube body 51 through the pressure plate 12.

[0042] like Figure 5As shown, in this embodiment, the pressure detection unit 1, temperature detection unit 2, data processing unit 3, and signal transmission unit 4 are all encapsulated within the housing 5, formed into a single unit using an electron beam welding process, and then mounted to the inspected pipe 6 via the external threads on the injection-molded base 52. Because the pressure detection unit 1 and the temperature detection unit 2 are isolated from external pressure interference by the double-layer thick metal diaphragm, and from temperature interference by the plastic base 522 and sealing ring 14, the detected pressure and temperature values ​​are the actual values ​​inside the inspected pipe 6. Combined with the detection accuracy of the detection sensor 8 itself, the measurement accuracy of the pipeline pressure detection assembly is greatly improved, meeting the requirements of pipeline air tightness testing and pressure monitoring.

[0043] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A pipeline pressure detection component, characterized in that: The invention comprises a housing (5), wherein a pressure detection unit (1) and a temperature detection unit (2) are provided in the housing (5), wherein the temperature detection unit (2) is used to detect temperature changes in the detected pipeline (6), wherein the pressure detection unit (1) comprises a detection sensor (8), wherein one end of the detection sensor (8) is sealedly connected to a pressure-sensitive diaphragm (9), wherein the pressure-sensitive diaphragm (9) is used to sense pressure changes in the detected pipeline (6), wherein a gas having the same pressure as that in the detected pipeline (6) is encapsulated in a cavity between the pressure-sensitive diaphragm (9) and the detection sensor (8), wherein the other end of the detection sensor (8) is sealedly connected to a double-layer metal diaphragm, wherein the double-layer metal diaphragm is composed of an inner diaphragm (10) and an outer diaphragm (11), wherein a gas having the same pressure as that in the detected pipeline (6) is encapsulated in a cavity between the inner diaphragm (10) and the detection sensor (8), wherein a gas having the same pressure as that in the detected pipeline (6) is encapsulated, wherein a cavity is formed between the inner diaphragm (10) and the outer diaphragm (11), wherein a gas having the same pressure as that in the detected pipeline (6) is encapsulated in the cavity. gas; the volume of gas in the cavity between the inner diaphragm (10) and the outer diaphragm (11) is greater than the volume of gas in the cavity between the inner diaphragm (10) and the detection sensor (8); a data processing unit (3) is further provided in the housing (5), the data processing unit (3) is used to collect, organize and calculate the detection values ​​of the pressure detection unit (1) and the temperature detection unit (2) and obtain the corrected pressure value; and a signal transmission unit (4) is also included, the signal transmission unit (4) is used to transmit the corrected pressure value of the data processing unit (3) to the detection terminal or monitoring platform; the housing (5) includes a sealed tube body (51) and an injection molding base (52), the pressure detection unit (1) and the temperature detection unit (2) are arranged in the sealed tube body (51), the data processing unit (3) and the signal transmission unit (4) are arranged in the injection molding base (52), and the pressure detection unit (1), the temperature detection unit (2) and the data processing unit (3) are electrically connected.

2. The pipeline pressure detection assembly according to claim 1, characterized in that: Heat-insulating glue is provided between the temperature detection unit (2) and the sealing tube body (51).

3. The pipeline pressure detection assembly according to claim 1, characterized in that: The injection-molded base (52) comprises a connecting tube (521) and a plastic base (522), and the connecting tube (521) and the plastic base (522) are formed by one-time welding using an injection molding process.

4. The pipeline pressure detection assembly according to claim 3, characterized in that: The sealing tube body (51) and the connecting tube (521) are both made of metal, and the sealing tube body (51) and the connecting tube (521) are welded into a whole.

5. The pipeline pressure detection assembly according to claim 1, characterized in that: A pressure plate (12) is further provided in the sealing tube body (51). The pressure plate (12) is arranged outside the outer diaphragm (11). The pressure plate (12) is connected to the pressure detection unit (1) via a fixing member (13) and is used to seal the pressure detection unit (1) in the sealing tube body (51).

6. The pipeline pressure detection assembly according to claim 1, characterized in that: A sealing ring (14) is provided between the outer wall of the pressure detection unit (1) and the inner wall of the sealing tube body (51).

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