Integrated pressure tester and method thereof for calculating corrected pressure drop

Abstract

The invention discloses an integrated pressure test instrument and a method for calculating and correcting pressure drop thereof.The integrated pressure test instrument comprises a pressure test instrument body, a connecting pipe is arranged on one side of the pressure test instrument body, a containing cavity is formed in the connecting pipe, a pressure sensor and an atmospheric pressure sensor are arranged in the containing cavity, and a penetrating hole is formed in the side wall of the connecting pipe; a sensing probe of the atmospheric pressure sensor extends out of the penetrating hole, the pressure tester body is further connected with a temperature sensor which can be placed beside a gas pipeline, and a control circuit board which can receive signals of the pressure sensor, the temperature sensor and the atmospheric pressure sensor so as to calculate corrected pressure drop is arranged in the pressure tester body. An output unit capable of outputting corrected pressure drop is arranged on the pressure tester main body and can output corrected pressure drop after compensation calculation so as to judge whether the tightness in the pipe is qualified or not, and the calculation result is subjected to atmospheric pressure compensation and temperature compensation so as to reduce the influence of external environmental factors on the test result and reduce the measurement error. And the result accuracy is improved.

Description

Technical Field

[0001] The invention relates to the technical field of gas pipeline pressure testing equipment, in particular to an integrated pressure testing instrument. The invention also relates to a method for calculating a corrected pressure drop using the instrument. Background Art

[0002] During the installation and maintenance of gas pipelines, pressure testing is an important process to ensure the integrity and safety of the pipeline system. Traditional pressure testing equipment usually requires separate pressure gauges and thermometers to monitor the pressure and temperature inside the pipeline respectively. This method is not only complicated to operate, but also lacks an effective pressure and temperature compensation mechanism, which may lead to inaccurate measurement results.

[0003] Although there are some integrated temperature and pressure transmitters on the market that integrate pressure and temperature measurement functions, there are still some limitations in actual use. For example, these devices often do not take into account external environmental factors, such as the impact of atmospheric pressure changes on measurement results, which may lead to deviations in measurement data obtained at different altitudes or in different weather conditions. In addition, most existing pressure testers cannot directly provide temperature-compensated pressure values ​​and pressure-compensated temperature values, making it difficult for users to quickly and accurately assess the actual condition of the pipeline.

[0004] The present invention is made based on the above situation. Summary of the invention

[0005] The present invention overcomes the shortcomings of the prior art and provides an integrated pressure tester capable of relatively accurately calculating the air tightness of a pipeline and a method for calculating and correcting the pressure drop.

[0006] The present invention is achieved through the following technical solutions:

[0007] An integrated pressure tester comprises a pressure tester body, a connecting pipe capable of being conductively connected to a gas pipeline is provided on one side of the pressure tester body, a containing cavity is provided in the connecting pipe, a pressure sensor and an atmospheric pressure sensor are provided in the containing cavity, a through hole is provided on a side wall of the connecting pipe, a sensing probe of the atmospheric pressure sensor extends out of the through hole, a temperature sensor capable of being placed next to the gas pipeline is connected to the pressure tester body via an electric wire, a control circuit board capable of receiving signals from the pressure sensor, the temperature sensor and the atmospheric pressure sensor so as to calculate a corrected pressure drop is provided in the pressure tester body, and an output unit capable of outputting the corrected pressure drop is provided on the pressure tester body.

[0008] In the integrated pressure tester as described above, the surface of the pressure sensor is provided with a first protrusion structure for increasing its sensing surface, and the first protrusion structure includes a threaded protrusion or an annular protrusion.

[0009] In the integrated pressure tester as described above, the surface of the temperature sensor is provided with a second protrusion structure for increasing its sensing surface, and the second protrusion structure includes a threaded protrusion or an annular protrusion.

[0010] In the integrated pressure tester as described above, the pressure sensor, the temperature sensor and the atmospheric pressure sensor are respectively connected to the control circuit board through independent wires.

[0011] In the integrated pressure tester as described above, a sealing ring for sealing the gap between the sensing probe of the atmospheric pressure sensor and the hole wall of the through hole is provided.

[0012] In the integrated pressure tester as described above, a connector is provided on the lower side of the pressure tester body, the upper end of the connecting pipe is threadedly connected to the connector, and the lower end of the connecting pipe is provided with a threaded structure that can be threadedly connected to the gas pipeline.

[0013] In the integrated pressure tester as described above, a connecting column is connected to the main body of the pressure tester, the pressure sensor and the atmospheric pressure sensor are directly or indirectly connected to the connecting column, and the connecting pipe sleeve is arranged on the outside of the connecting column.

[0014] In the integrated pressure tester as described above, a leak detection hole for detecting the air tightness of the connection between the connector and the connecting pipe is provided between the connector and the connecting pipe.

[0015] In the integrated pressure tester as described above, the output unit includes a display screen and a wireless signal transmission antenna, and both the display screen and the wireless signal transmission antenna are electrically connected to the control circuit board.

[0016] The invention also provides a method for calculating the corrected pressure drop of the integrated pressure tester.

[0017] The present invention is achieved through the following technical solutions:

[0018] The duration of the tightness test voltage stabilization is set to H through the control circuit board, H is greater than or equal to 24 hours, and the measurement value is recorded at least once every hour;

[0019] The calculation formula for correcting the pressure drop in the control circuit board is:

[0020] ΔP′=(F1+P1)-(F2+P2)*(273+T1) / (273+T2)

[0021] Among them, ΔP′ is the corrected pressure drop; F1 is the pressure value measured by the pressure sensor at the beginning of the test; F2 is the pressure value measured by the pressure sensor at the end of the test; P1 is the atmospheric pressure value measured by the atmospheric pressure sensor at the beginning of the test; P2 is the atmospheric pressure value measured by the atmospheric pressure sensor at the end of the test; T1 is the temperature value measured by the temperature sensor at the beginning of the test; t2 is the temperature value measured by the temperature sensor at the end of the test; when the calculated ΔP′ is less than 133Pa, the test result of the tightness test pressure stabilization is qualified.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. This case can output the corrected pressure drop after compensation calculation, so as to judge whether the tightness inside the pipe is qualified. The calculation result is compensated for atmospheric pressure and temperature, so as to reduce the influence of external environmental factors on the test results, reduce measurement errors and improve the accuracy of the results.

[0024] 2. The temperature sensor can be buried next to the gas pipeline to be tested to simulate the temperature inside the pipe for inspection.

[0025] 3. The surface of the pressure sensor is provided with a first protruding structure for increasing its sensing surface, and the surface of the temperature sensor is provided with a second protruding structure for increasing its sensing surface, thereby increasing the effective contact area between the sensor and the medium, which helps to improve the response speed and measurement accuracy of the sensor.

[0026] 4. The pressure sensor, temperature sensor and atmospheric pressure sensor are connected to the control circuit board through independent wires. Independent wiring can reduce the mutual interference of signals between different sensors. Separate lines reduce the possibility of signal attenuation and crosstalk, which helps to improve the accuracy and reliability of each sensor data. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is an exploded schematic diagram of the present invention;

[0030] Figure 3 It is a cross-sectional schematic diagram of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings:

[0032] like Figures 1 to 3An integrated pressure tester shown in the figure comprises a pressure tester body 1, a connecting pipe 2 which can be conductively connected to a gas pipeline is provided on one side of the pressure tester body 1, a receiving cavity 21 is provided in the connecting pipe 2, a pressure sensor 3 and an atmospheric pressure sensor 5 are provided in the receiving cavity 21, a through hole 22 is provided on the side wall of the connecting pipe 2, a sensing probe of the atmospheric pressure sensor 5 extends out from the through hole 22, a temperature sensor 4 which can be placed next to the gas pipeline is also connected to the pressure tester body 1 through an electric wire 7, a control circuit board 6 which can receive signals from the pressure sensor 3, the temperature sensor 4 and the atmospheric pressure sensor 5 to calculate a corrected pressure drop is provided in the pressure tester body 1, and an output unit which can output the corrected pressure drop is provided on the pressure tester body 1.

[0033] This case can output the corrected pressure drop after compensation calculation, so as to judge whether the tightness inside the pipe is qualified. The calculation result is compensated by atmospheric pressure and temperature, so as to reduce the influence of external environmental factors on the test results, reduce the measurement error, and improve the accuracy of the results. The temperature sensor 4 can be buried beside the gas pipeline to be tested, and simulate the temperature inside the pipe for inspection.

[0034] Specifically, a connector 11 is provided at the lower side of the pressure tester body 1, the upper end of the connecting pipe 2 is threadedly connected to the connecting pipe 11, and the lower end of the connecting pipe 2 is provided with a threaded structure 23 that can be threadedly connected to the gas pipeline. Of course, the connecting pipe 2 can also be connected to the pressure tester body 1 through other connection structures such as buckles or flanges.

[0035] In one embodiment, a connecting column 12 is connected to the pressure tester body 1, the pressure sensor 3 and the atmospheric pressure sensor 5 are directly or indirectly connected to the connecting column 12, and the connecting pipe 2 is sleeved on the outside of the connecting column 12. A mounting groove 110 is provided at the lower end of the connector 11, the connecting column 12 can be connected to the inner top of the mounting groove 110 by glue or other connecting structures such as buckles, the pressure sensor 3 can be connected to the bottom of the connecting column 12 by glue or other connecting structures such as buckles, and the atmospheric pressure sensor 5 can be connected to the connecting column 12 by a threaded structure or other connecting structures.

[0036] In one embodiment, a leak detection hole 111 for detecting the air tightness of the connection between the connector 11 and the connecting pipe 2 is provided. In one embodiment, the leak detection hole 111 is provided on the connector 11, and the leak detection hole 111 is communicated with the inner top of the mounting groove 110. When the connecting column 12 is connected to the inner top of the mounting groove 110, the connecting column 12 can block the leak detection hole 111 and limit the gas from being discharged from the leak detection hole 111.

[0037] In some embodiments, a sealing ring 8 is provided between the sensing probe of the atmospheric pressure sensor 5 and the hole wall of the through hole 22 to seal the gap therebetween, and the sealing ring 8 is used to limit the gas from being discharged from the through hole 22 to prevent the leakage from affecting the measurement structure. Of course, the sensing probe of the atmospheric pressure sensor 5 and the through hole 22 can also be sealed to prevent leakage by interference fit.

[0038] In some embodiments, the pressure sensor 3 is provided with a first protrusion structure 31 on its outer surface for increasing its sensing surface. The first protrusion structure 31 may be a threaded protrusion or an annular protrusion, or a protrusion of other shapes. The first protrusion structure 31 increases the effective area of ​​the pressure sensor 3 in contact with the gas, which helps to improve the response speed and measurement accuracy of the sensor.

[0039] In some embodiments, the surface of the temperature sensor 4 is provided with a second protrusion structure 41 for increasing its sensing surface. The second protrusion structure 41 may be a threaded protrusion or an annular protrusion, or a protrusion of other shapes. The second protrusion structure 41 increases the effective area of ​​the temperature sensor 4 in contact with the gas, which helps to improve the response speed and measurement accuracy of the temperature sensor 4.

[0040] In some embodiments, the temperature sensor 4 may be a threaded temperature sensor, a probe temperature sensor, or other types of temperature sensors.

[0041] In some embodiments, the above-mentioned pressure sensor 3, temperature sensor 4 and atmospheric pressure sensor 5 are respectively connected to the control circuit board 6 through independent wires 7. Independent wiring can reduce the mutual interference of signals between different sensors. The separated lines reduce the possibility of signal attenuation and crosstalk, which helps to improve the accuracy and reliability of each sensor data.

[0042] In some embodiments, the output unit includes a display screen 91 and a wireless signal transmission antenna 92, and the display screen 91 and the wireless signal transmission antenna 92 ​​are both electrically connected to the control circuit board 6. The test data can be transmitted through the wireless signal transmission antenna 92, which reduces the work of manual copying and avoids the adverse effects caused by manual copying errors.

[0043] In some embodiments, the pressure tester body 1 is also provided with a power supply 20 or a power plug for supplying power to various components.

[0044] A method for calculating the corrected pressure drop using the above-mentioned integrated pressure tester, wherein the duration of the tightness test voltage stabilization is set to H by controlling the circuit board 6, H is greater than or equal to 24 hours, and the measurement value is recorded at least once every hour; H equal to 24 hours is the preferred solution.

[0045] The calculation formula for correcting the pressure drop in the control circuit board 6 is:

[0046] ΔP′=(F1+P1)-(F2+P2)*(273+T1) / (273+T2)

[0047] Where ΔP′ is the corrected pressure drop, in units of P a ; F1 is the pressure value measured by pressure sensor 3 at the beginning of the test, in units of P a ; F2 is the pressure value measured by pressure sensor 3 at the end of the test, in units of P a ; P1 is the atmospheric pressure value measured by the atmospheric pressure sensor 5 at the beginning of the test, in units of P a ; P2 is the atmospheric pressure value measured by the atmospheric pressure sensor 5 at the end of the test, in units of P a ; T1 is the temperature value measured by the temperature sensor 4 at the beginning of the test, in °C; T2 is the temperature value measured by the temperature sensor 4 at the end of the test, in °C.

[0048] When the calculated ΔP′<133P a When the pressure is stabilized, the test result of the tightness test is qualified.

Claims

1. An integrated pressure tester, comprising a pressure tester body (1), one side of the pressure tester body (1) is provided with a connecting pipe (2) capable of being conductively connected to a gas pipeline, characterized in that: The connecting tube (2) is provided with a receiving cavity (21), the receiving cavity (21) is provided with a pressure sensor (3) and an atmospheric pressure sensor (5), a side wall of the connecting tube (2) is provided with a through hole (22), a sensing probe of the atmospheric pressure sensor (5) extends out from the through hole (22), the pressure test instrument body (1) is also connected to a temperature sensor (4) that can be placed next to the gas pipeline via an electric wire (7), the pressure test instrument body (1) is provided with a control circuit board (6) that can receive signals from the pressure sensor (3), the temperature sensor (4) and the atmospheric pressure sensor (5) so as to calculate a corrected pressure drop, and the pressure test instrument body (1) is provided with an output unit that can output the corrected pressure drop.

2. The integrated pressure tester according to claim 1, characterized in that: The pressure sensor (3) is provided with a first protrusion structure (31) on its outer surface for increasing its sensing surface, wherein the first protrusion structure (31) comprises a thread-shaped protrusion or an annular protrusion.

3. The integrated pressure tester according to claim 1, characterized in that: The surface of the temperature sensor (4) is provided with a second protrusion structure (41) for increasing its sensing surface, and the second protrusion structure (41) comprises a thread-shaped protrusion or an annular protrusion.

4. An integrated pressure tester according to any one of claims 1 to 3, characterized in that: The pressure sensor (3), the temperature sensor (4) and the atmospheric pressure sensor (5) are connected to the control circuit board (6) via independent wires (7).

5. The integrated pressure tester according to claim 1, characterized in that: A sealing ring (8) is provided between the sensing probe of the atmospheric pressure sensor (5) and the hole wall of the through hole (22) for sealing the gap therebetween.

6. The integrated pressure tester according to claim 1, characterized in that: A connector (11) is provided on the lower side of the pressure tester body (1), the upper end of the connecting pipe (2) is threadedly connected to the connector (11), and the lower end of the connecting pipe (2) is provided with a threaded structure (23) that can be threadedly connected to a gas pipeline.

7. The integrated pressure tester according to claim 6, characterized in that: The pressure tester body (1) is connected to a connecting column (12), the pressure sensor (3) and the atmospheric pressure sensor (5) are directly or indirectly connected to the connecting column (12), and the connecting pipe (2) is sleeved on the outside of the connecting column (12).

8. The integrated pressure tester according to claim 6, characterized in that: A leak detection hole (111) for detecting the air tightness of the connection between the connector (11) and the connecting pipe (2) is provided between the connector (11) and the connecting pipe (2).

9. The integrated pressure tester according to claim 1, characterized in that: The output unit comprises a display screen (91) and a wireless signal transmission antenna (92), and the display screen (91) and the wireless signal transmission antenna (92) are both electrically connected to the control circuit board (6).

10. A method for calculating the corrected pressure drop applied to the integrated pressure tester according to any one of claims 1 to 9, characterized in that: The duration of the tightness test voltage stabilization is set to H by the control circuit board (6), H is greater than or equal to 24 hours, and the measurement value is recorded at least once every hour; The calculation formula for correcting the pressure drop in the control circuit board (6) is: AP′=(F1+P1)-(F2+P2)*(273+T1) / (273+T2); Wherein, AP′ is the corrected pressure drop; F1 is the pressure value measured by the pressure sensor (3) at the beginning of the test; F2 is the pressure value measured by the pressure sensor (3) at the end of the test; P1 is the atmospheric pressure value measured by the atmospheric pressure sensor (5) at the beginning of the test; P2 is the atmospheric pressure value measured by the atmospheric pressure sensor (5) at the end of the test; T1 is the temperature value measured by the temperature sensor (4) at the beginning of the test; T2 is the temperature value measured by the temperature sensor (4) at the end of the test; when the calculated ΔP′<133P a When the pressure is stabilized, the test result of the tightness test is qualified.

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