A portable gas leakage generating device in acoustic emission state and its testing method

Abstract

The present invention discloses a portable gas leakage generating device in an acoustic emission state and a test method thereof. The gas leakage generating device comprises: a device body having an operation panel, a leakage hole for gas leakage is provided on the operation panel; a gas storage tank is placed inside the device body; a gas storage pressure gauge is installed on the operation panel and is connected with the gas storage tank for measuring the pressure inside the gas storage tank; an air inlet of the flow meter is connected with the gas storage port of the gas storage tank for measuring the gas flow rate leaked from the gas storage tank, and the leakage hole is connected with the gas outlet of the flow meter through an air guide pipe; a leakage hole pressure gauge is connected with the leakage hole for detecting the pressure at the leakage hole; a power source is respectively connected with the gas storage pressure gauge, the flow meter, and the leakage hole pressure gauge. The gas leakage generating device in the present invention can not only test or calibrate the ultrasonic leak detector, but also is easy to carry.

Description

Technical Field

[0001] The invention relates to the technical field of gas leakage generating devices, and more particularly to a portable gas leakage generating device in an acoustic emission state and a testing method thereof. Background Art

[0002] Acoustic emission state: If a container is filled with gas, when its internal pressure is greater than the external pressure and the pressure difference is large, once there is a leak in the container, the gas will rush out from the leak. When the leak is small, the rushing gas forms turbulence and generates sound waves of a certain frequency near the leak. The acoustic emission state refers to the sound phenomenon that occurs near the leak when the gas leak rate is large.

[0003] At present, gas leakage generators are mostly used for vacuum leakage detection in molecular flow state, and are mostly used for helium mass spectrometer leak detectors. The leakage rate range of gas leakage is relatively small, generally within (10 -3 ~10 -9 )Pa·m 3 / s or less. There are fewer gas leakage devices in the acoustic emission state, and the leakage rate range of the gas leakage is ≥10 -3 Pa·m 3 / s.

[0004] Gas leakage devices in the acoustic emission state often use gas tanks, air compressors and leaks of a certain size to simulate gas leakage sources, and test ultrasonic leak detectors. The pressure of the leaked gas is measured by the tank pressure. However, the current equipment has two shortcomings: on the one hand, it has no leakage rate measurement function, only pressure measurement display, and lacks measurement function; on the other hand, the size and weight of the equipment are often large, making it inconvenient to carry.

[0005] Therefore, it is an urgent problem for those skilled in the art to develop a portable gas leakage generating device in an acoustic emission state that can detect the leakage rate and is easy to carry and a testing method thereof. Summary of the invention

[0006] In view of this, the present invention provides a portable gas leakage generating device in an acoustic emission state which can detect the leakage rate and is easy to carry and a testing method thereof.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A portable gas leakage generating device in an acoustic emission state, comprising:

[0009] A device body, wherein the device body has an operation panel, and a leakage hole for air leakage is provided on the operation panel;

[0010] A gas storage tank, the gas storage tank is placed inside the device body;

[0011] A gas storage pressure gauge, which is installed on the operation panel and is connected to the gas storage tank and is used to measure the pressure in the gas storage tank;

[0012] A flow meter, wherein the air inlet of the flow meter is connected to the air storage port of the air storage tank, and is used to measure the gas flow rate leaking from the air storage tank, and the leakage hole is connected to the air outlet of the flow meter through an air guide pipe;

[0013] A leak hole pressure gauge, the leak hole pressure gauge is connected to the leak hole and is used to detect the pressure at the leak hole;

[0014] A power supply is connected to the gas storage pressure gauge, the flow meter and the leak pressure gauge respectively.

[0015] The beneficial effect of adopting the above technical solution is that, in the present invention, the amount of gas leaking from the gas storage tank can be detected by the flow meter, and the pressure value at the leak hole can be detected by the leak hole pressure gauge, so the gas leakage rate can be directly measured, and no air compressor, gas cylinder and other equipment are used. The structure of the device is simpler and more convenient to carry.

[0016] Preferably, the operation panel includes: a first operation panel and a second operation panel, the first operation panel and the second operation panel are two panels of the device body, respectively, the gas storage pressure gauge, the flow meter instrument panel connected to the flow meter, the leak pressure gauge, and the leak are all arranged on the first operation panel. By setting two operation panels, each operation step can be classified, so that the operation steps on the operation panel are displayed more clearly.

[0017] Preferably, an air pump is placed outside the device body, and the air pump is connected to the gas storage port of the gas tank to obtain the pressure required for the operation of the gas tank. Gas is introduced into the gas tank through the air pump, and the amount of gas in the gas tank is detected by a gas pressure gauge. After the pressure in the gas tank reaches a set value, inflation is stopped.

[0018] Preferably, a switch knob is provided on the first operating panel, and the air storage port of the air tank, the air outlet of the air pump and the air inlet of the flow meter are all connected to the conversion switch through the air duct, and the conversion switch is connected to the switch knob, and the conversion switch is controlled by rotating the switch knob to connect the air tank and the air pump or the air tank and the flow meter. By adjusting the switch knob of the conversion switch, the air tank is connected to the air pump or the flow meter. The conversion switch has three gears, one is to connect the air pump to the air tank for inflation, the second is to connect the flow meter to the air tank for leakage, and the third is in the middle position, the air storage port of the air tank is closed, and neither inflation nor leakage occurs.

[0019] Preferably, it further comprises a leakage regulating valve and a leakage regulating knob, wherein the leakage regulating valve is connected to the air duct between the flow meter and the conversion switch, and the leakage regulating knob is installed on the first operation panel, and the leakage regulating knob is connected to the leakage regulating valve and controls the leakage regulating valve to adjust the leakage amount. The leakage regulating valve is adjusted by the leakage regulating knob to change the amount of leakage in the air duct.

[0020] Preferably, the flow meter is communicated with the leakage hole through an air guide pipe connected to two ports of the three-way pipe, and the leakage hole pressure gauge is communicated with the third port of the three-way pipe through the air guide pipe.

[0021] Preferably, it further comprises an adjusting sheet for adjusting the size of the leakage hole, the adjusting sheet is located outside the first operating panel corresponding to the leakage hole, the adjusting sheet is fixed and sealed by a knob installed on the first operating panel, and a vent hole for air leakage is provided on the surface of the adjusting sheet. The vent hole on the adjusting sheet can have different sizes, and the size of the vent hole at the leakage hole can be changed by replacing the adjusting sheet.

[0022] Preferably, the second operation panel is provided with a power socket and a power switch, and the power socket and the power switch are both electrically connected to the power supply.

[0023] Preferably, an air storage inlet is provided on the second operating panel, for the air guide tube to pass through in a sealed manner to connect the air storage tank with the air pump.

[0024] A method for testing a portable gas leakage generating device in an acoustic emission state comprises the following testing steps:

[0025] 1) Select an ultrasonic leak detector to be tested, place the ultrasonic leak detector and the gas leak generator in a quiet environment, and place the acoustic sensor of the ultrasonic leak detector coaxially with the leak hole of the gas leak generator at a distance that is the detection distance of the minimum leak rate of the ultrasonic leak detector;

[0026] 2) The initial output leakage rate of the gas leakage generating device is 0. The gas leakage generating device is started to leak, and the leakage regulating valve is adjusted to change the output leakage rate from small to large. When the ultrasonic leak detector detects the minimum leakage and the display is stable, the output leakage rate of the gas leakage generating device is recorded. The output leakage rate is the lowest leakage rate detected by the ultrasonic leak detector under the current environment.

[0027] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a portable gas leakage generating device in an acoustic emission state and a testing method thereof, which has the following beneficial effects:

[0028] (1) In the present invention, the gas pressure in the gas storage tank is detected by a gas storage pressure gauge to ensure the accuracy of the gas pressure in the gas storage tank;

[0029] (2) The amount of gas leaking from the gas tank can be detected by the flow meter, and the pressure value at the leak hole can be detected by the leak hole pressure gauge. The gas leakage rate can be directly measured based on the amount of gas leakage and the pressure value at the leak hole;

[0030] (3) The present invention does not use air compressors, gas cylinders and other equipment, and the structure of the device is simpler and more convenient to carry;

[0031] (4) The device of the present invention can simulate gas leakage in an acoustic emission state, can adjust the output leakage rate and measure it, and is applicable to the testing of ultrasonic leak detectors and other occasions where it is necessary to simulate gas leakage in an acoustic emission state.

[0032] The leakage rate of the present invention refers to the amount of dry gas of a given temperature flowing through the leakage point per unit time when the pressure difference on both sides of the leakage point is known. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0034] Figure 1 The accompanying drawing is a schematic structural diagram of a first operation panel provided by the present invention;

[0035] Figure 2 The accompanying drawing is a schematic structural diagram of a second operation panel provided by the present invention;

[0036] Figure 3 The accompanying drawing is a working principle diagram of the gas leakage generating device provided by the present invention;

[0037] Figure 4 The accompanying drawing is a schematic structural diagram of an adjusting sheet provided by the present invention;

[0038] Figure 5 The accompanying drawing is a schematic structural diagram of another adjusting piece provided by the present invention.

[0039] Among them, in the figure,

[0040] 1-Device body;

[0041] 011-operation panel;

[0042] 0111-first operation panel; 0112-second operation panel;

[0043] 2-leakage hole; 3-gas storage tank; 4-gas storage pressure gauge;

[0044] 5-Flow meter;

[0045] 51-Flow meter instrument panel;

[0046] 6-leakage pressure gauge; 7-power supply; 8-air pump;

[0047] 9-conversion switch;

[0048] 091-Switch knob;

[0049] 10-leakage regulating valve;

[0050] 0101-leakage adjustment knob;

[0051] 11- tee pipe;

[0052] 12-adjustment sheet;

[0053] 0121-Ventilation hole;

[0054] 13-power socket; 14-power switch; 15-gas storage inlet; 16-nameplate. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] The embodiment of the present invention discloses a portable gas leakage generating device in an acoustic emission state, comprising:

[0057] The device body 1 has an operation panel 011, and a leakage hole 2 for air leakage is provided on the operation panel 011;

[0058] A gas storage tank 3, which is placed inside the device body 1;

[0059] A gas storage pressure gauge 4, which is installed on the operation panel 011 and is connected to the gas storage tank 3, and is used to measure the pressure in the gas storage tank 3;

[0060] A flow meter 5, the air inlet of the flow meter 5 is connected to the air storage port of the air storage tank 3, and is used to measure the gas flow rate leaking from the air storage tank 3, and the leakage hole 2 is connected to the air outlet of the flow meter 5 through an air guide pipe;

[0061] The leak hole pressure gauge 6 is connected to the leak hole 2 and is used to detect the pressure at the leak hole 2;

[0062] The power supply 7 is connected to the gas storage pressure gauge 4, the flow meter 5 and the leakage hole pressure gauge 6 respectively.

[0063] In order to further optimize the above technical solution, the operation panel 011 includes: a first operation panel 0111 and a second operation panel 0112. The first operation panel 0111 and the second operation panel 0112 are two panels of the device body 1, respectively. The gas storage pressure gauge 4, the flow meter instrument panel 51 connected to the flow meter 5, the leakage hole pressure gauge 6, and the leakage hole 2 are all arranged on the first operation panel 0111. The first operation panel 0111 displays the parameter values ​​that need to be observed during the test, as well as the switch knob 091 and the leakage adjustment knob 0101, which facilitates the control of the conversion switch 9 and the leakage adjustment valve 10.

[0064] In order to further optimize the above technical solution, an air pump 8 is placed outside the device body 1, and the air pump 8 is connected to the air storage port of the air storage tank 3 to obtain the pressure required for the operation of the air storage tank 3. The air pump 8 is connected to an external power supply to provide electric energy to the air pump 8.

[0065] In order to further optimize the above technical solution, a switch knob 091 is provided on the first operation panel 0111. The air storage port of the air storage tank 3, the air outlet of the air pump 8 and the air inlet of the flow meter 5 are all connected to the conversion switch 9 through the air guide pipe. The conversion switch 9 is connected to the switch knob 091. By rotating the switch knob 091, the conversion switch 9 is controlled to conduct the air storage tank 3 and the air pump 8 or the air storage tank 3 and the flow meter 5. Figure 1 As shown, the conversion switch 9 has three gears. When the switch knob 091 is rotated to B, the air pump is connected to the air tank for inflation; when it is rotated to A, the flow meter is connected to the air tank for leakage; when it is rotated to O, the air storage port of the air tank is closed, and there is neither inflation nor leakage.

[0066] In order to further optimize the above technical solution, it also includes a leakage regulating valve 10 and a leakage regulating knob 0101. The leakage regulating valve 10 is connected to the air duct between the flow meter 5 and the conversion switch 9. The leakage regulating knob 0101 is installed on the first operating panel 0111. The leakage regulating knob 0101 is connected to the leakage regulating valve 10 and controls the leakage regulating valve 10 to adjust the leakage amount.

[0067] In order to further optimize the above technical solution, the flow meter 5 and the leak hole 2 are connected through an air guide tube connected to two ports of the three-way pipe 11, and the leak hole pressure gauge 6 is connected to the third port of the three-way pipe 11 through the air guide tube. The setting of the three-way pipe 11 facilitates the connection of the flow meter 5, the leak hole 2 and the leak hole pressure gauge 6.

[0068] In order to further optimize the above technical solution, an adjustment sheet 12 for adjusting the size of the leak hole is also included. The adjustment sheet is located outside the first operating panel 0111 corresponding to the leak hole 2. The adjustment sheet 12 is fixed and sealed by a knob installed on the first operating panel 0111. A vent hole 0121 for air leakage is provided on the surface of the adjustment sheet 12. When it is necessary to perform a leakage test on leak holes 2 of different sizes or shapes, this can be achieved by replacing different types of adjustment sheets 12. Figure 4 , 5 As shown, the vent hole 0121 can be a round hole or an elongated hole.

[0069] In order to further optimize the above technical solution, a power socket 13 and a power switch 14 are provided on the second operation panel 0112 , and both the power socket 13 and the power switch 14 are electrically connected to the power source 7 .

[0070] In order to further optimize the above technical solution, an air storage inlet 15 is provided on the second operating panel 0112 for the air guide tube to pass through in a sealed manner to connect the air storage tank 3 with the air pump 8 .

[0071] In order to further optimize the above technical solution, a nameplate 16 for marking information is provided on the surface of the second operating panel 0112.

[0072] A method for testing a portable gas leakage generating device in an acoustic emission state comprises the following testing steps:

[0073] 1) Select the ultrasonic leak detector to be tested, place the ultrasonic leak detector and the gas leak generator in a quiet environment, and place the acoustic sensor of the ultrasonic leak detector coaxially with the leak hole 2 of the gas leak generator at a distance equal to the detection distance of the minimum leak rate of the ultrasonic leak detector;

[0074] 2) The initial output leakage rate of the gas leakage generating device is 0. The gas leakage generating device is started to leak, and the leakage regulating valve 10 is adjusted to change the output leakage rate from small to large. When the ultrasonic leak detector detects the smallest leakage and the display is stable, the output leakage rate of the gas leakage generating device is recorded. The output leakage rate is the lowest leakage rate detected by the ultrasonic leak detector under the current environment.

[0075] If the detection distance of the minimum leakage rate of the ultrasonic leak detector is not specified, the typical detection distance can be set to 1 meter, and the gas leakage generating device is installed with a leak hole of the specified diameter 2, the typical value is 0.1mm.

[0076] In order to further optimize the above technical solution, when the leak hole 2 is large, the human ear can hear the sound of gas leakage. When the leak hole 2 is very small and the sound wave frequency is greater than 20kHz, the human ear cannot hear it, but they can propagate in the air and are called airborne ultrasound. Ultrasonic waves are high-frequency short-wave sound signals, and their intensity decays rapidly as the distance from the sound source (leak hole) increases. Ultrasonic waves are highly directional signals, so it is relatively simple to detect and find the leak location using their strong directional characteristics. The ultrasonic wave frequency band generated by the gas leakage at the leak hole 2 is relatively wide, generally between 20kHz and 100kHz, and the spectrum peak appears near 40kHz. The leak hole 2 is very small in size and can generate ultrasonic signals under a certain pressure and simulate the leakage of the gas pipeline.

[0077] The pressure at the leak hole 2 is measured by the leak hole pressure gauge 6, and the leakage is measured by the flow meter 5. The product of the measurement results of the two instruments represents the leakage rate at the leak hole 2. Leakage rate = leakage × pressure = m 3 / s×Pa=Pa·m 3 / s. The leakage rate of the device is controlled by a leakage regulating valve, which is mainly composed of an adjustable gas valve; the air pump 8 is powered by a 220V AC power supply, the gas storage pressure gauge 4 and the leak hole pressure gauge 6 are powered by a 9V DC power supply, and the flow meter 5 is powered by a 24V DC power supply.

[0078] Working process:

[0079] In the inflation state, the air pump 8 inflates the air tank 3, and the conversion switch 9 is switched to the air pump 8 and the air tank 3 are connected. The air tank 3 is designed to be 3L and the pressure resistance exceeds 5MPa, which ensures that the calibration device can work for a long time. The pressure of the air tank 3 is measured by the air pressure gauge 4. After reaching the specified pressure, the inflation is ended and the air pump 8 is turned off. At the same time, the conversion switch 9 is switched to the off state.

[0080] In the gas outlet state, the conversion switch 9 is switched to the state where the gas tank 3 and the flow meter 5 are connected, and the gas in the gas tank 3 is output from the leak hole 2 through the conversion switch 9, the leakage regulating valve 10, and the flow meter 5, simulating the gas leakage process.

[0081] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0082] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A portable gas leakage generating device in an acoustic emission state, characterized in that: include: A device body (1), the device body (1) having an operation panel (011), the operation panel (011) having a leakage hole (2) for air leakage; An air storage tank (3), the air storage tank (3) being placed inside the device body (1); A gas storage pressure gauge (4), the gas storage pressure gauge (4) being mounted on the operation panel (011) and being in communication with the gas storage tank (3) and being used to measure the pressure in the gas storage tank (3); A flow meter (5), wherein the air inlet of the flow meter (5) is connected to the air storage port of the air storage tank (3) and is used to measure the flow rate of gas leaking from the air storage tank (3); the leakage hole (2) is connected to the air outlet of the flow meter (5) via an air guide pipe; A leak hole pressure gauge (6), the leak hole pressure gauge (6) being connected to the leak hole (2) and used for detecting the pressure at the leak hole (2); A power supply (7), the power supply (7) being connected to the gas storage pressure gauge (4), the flow meter (5), and the leak pressure gauge (6) respectively; The operation panel (011) comprises: a first operation panel (0111) and a second operation panel (0112); the first operation panel (0111) and the second operation panel (0112) are respectively two panels of the device body (1); the gas storage pressure gauge (4), a flow meter instrument panel (51) connected to the flow meter (5), the leak hole pressure gauge (6), and the leak hole (2) are all arranged on the first operation panel (0111); An air pump (8) is placed outside the device body (1), and the air pump (8) is connected to the air storage port of the air storage tank (3) to obtain the pressure required for the operation of the air storage tank (3); The first operating panel (0111) is provided with a switch knob (091); the gas storage port of the gas storage tank (3), the gas outlet of the gas pump (8) and the gas inlet of the flow meter (5) are all connected to the conversion switch (9) through the gas guide pipe; the conversion switch (9) is connected to the switch knob (091); the conversion switch (9) is controlled by rotating the switch knob (091) to conduct the gas storage tank (3) and the gas pump (8) or the gas storage tank (3) and the flow meter (5); The second operating panel (0112) is provided with an air storage inlet (15) for the air guide tube to pass through in a sealed manner to connect the air storage tank (3) with the air pump (8).

2. A portable gas leakage generating device in an acoustic emission state according to claim 1, characterized in that: It also includes a leakage regulating valve (10) and a leakage regulating knob (0101), wherein the leakage regulating valve (10) is connected to the air duct between the flow meter (5) and the conversion switch (9), and the leakage regulating knob (0101) is installed on the first operation panel (0111), and the leakage regulating knob (0101) is connected to the leakage regulating valve (10) and controls the leakage regulating valve (10) to adjust the leakage amount.

3. A portable gas leakage generating device in an acoustic emission state according to claim 1 or 2, characterized in that: The flow meter (5) is in communication with the leak hole (2) via an air guide pipe connected to two ports of the three-way pipe (11), and the leak hole pressure gauge (6) is in communication with the third port of the three-way pipe (11) via the air guide pipe.

4. A portable gas leakage generating device in an acoustic emission state according to claim 1, characterized in that: It also includes an adjustment sheet (12) for adjusting the size of the leakage hole, the adjustment sheet being located outside the first operating panel (0111) corresponding to the leakage hole (2), the adjustment sheet (12) being fixed and sealed by a knob mounted on the first operating panel (0111), and a vent hole (0121) for air leakage being provided on the surface of the adjustment sheet (12).

5. A portable gas leakage generating device in an acoustic emission state according to claim 4, characterized in that: The second operating panel (0112) is provided with a power socket (13) and a power switch (14), and the power socket (13) and the power switch (14) are both electrically connected to the power source (7).

6. A method for testing a portable gas leakage generating device in an acoustic emission state as claimed in any one of claims 1 to 5, characterized in that: The test steps include: 1) Select an ultrasonic leak detector to be tested, place the ultrasonic leak detector and the gas leak generator in a quiet environment, and place the acoustic sensor of the ultrasonic leak detector coaxially with the leak hole (2) of the gas leak generator at a distance equal to the detection distance of the minimum leak rate of the ultrasonic leak detector; 2) The initial output leakage rate of the gas leakage generating device is 0, the gas leakage generating device is started, gas is leaked, and the leakage regulating valve (10) is adjusted to change the output leakage rate from small to large. When the ultrasonic leak detector detects the minimum leakage and the display is stable, the output leakage rate of the gas leakage generating device is recorded. The output leakage rate is the lowest leakage rate detected by the ultrasonic leak detector under the current environment.

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