CN209858151U - Gas leakage detection device - Google Patents
Gas leakage detection device Download PDFInfo
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- CN209858151U CN209858151U CN201920961036.4U CN201920961036U CN209858151U CN 209858151 U CN209858151 U CN 209858151U CN 201920961036 U CN201920961036 U CN 201920961036U CN 209858151 U CN209858151 U CN 209858151U
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Abstract
The utility model discloses a gas leakage detection device for detect pneumatic pressure measuring device's leakage situation, include: the gas storage cylinder is communicated with the gas outlets of the pressure scanning valve bodies of the pneumatic pressure measuring device, high-pressure detection gas is stored in the gas storage cylinder, and a valve for switching on and off the gas storage cylinder is arranged; the gas collecting box is sleeved at the joint of the pressure guiding pipe of the pneumatic pressure measuring device and the air pressure collecting piece; and the gas leakage detector is communicated with the inner cavity of the gas collecting box and can detect, record and display the leakage rate of the detected gas. According to the configuration, the utility model provides a gas leakage detection device not only can carry out the accurate detection of leakage state to each draw the junction of pressing pipe and atmospheric pressure collection piece, can also measure, record and show leakage rate to make operating personnel can audio-visually learn whether each connection that draws the pipe is qualified.
Description
Technical Field
The utility model relates to a gaseous technical field that detects of aviation supporting product, more specifically say, relate to a gas leakage detection device suitable for pneumatic pressure measurement device.
Background
After the aircraft engine is assembled with the whole aircraft engine, the aircraft engine can be put into use formally only by monitoring the motion state of the aircraft engine through test operation and checking whether the performance of the aircraft engine meets the standard. The pneumatic pressure measurement is an important test content, and is a measurement of the air flow pressure inside the aircraft engine. In the prior art, as shown in fig. 1, a pneumatic pressure measuring device for performing pneumatic pressure measurement includes a plurality of pressure collecting members 1 extending to each position inside an aircraft engine, pressure introducing pipes 2 connected and communicated with each pressure collecting member 1 in a one-to-one correspondence manner, and a pressure scanning valve system, where the pressure scanning valve system includes a plurality of pressure scanning valve bodies 3, pressure bottles 8 communicated with the pressure scanning valve bodies 3, and a control unit 4 in communication connection with the pressure scanning valve bodies 3. Each pressure scanning valve body 3 is provided with a plurality of measuring ports 5 which are connected and communicated with the pressure leading pipes 2 in a one-to-one correspondence manner. Each air pressure acquisition part 1 is provided with an air cavity for air flow to enter and pass through, and the air cavity is communicated with the first end of the pressure guiding pipe 2 through an eduction pipe 6; the second end of each pressure guiding pipe 2 is connected and communicated with one measuring port 5, and each measuring port 5 can measure pressure information and store information such as calibration data, pressure range, factory calibration data, each calibration date set by a user and the like; the high-pressure gas is stored in the pressure bottle 8, and when the high-pressure gas is introduced into each pressure scanning valve body 3, each measuring port 5 of the pressure scanning valve body 3 can be opened by the control unit 4, and automatic data acquisition and data analysis are carried out on data information of the pressure scanning valve body 3, so that the experimenters can check the data information.
After the aero-engine is started, the measuring ports 5 of the pressure scanning valve body 3 are opened through the air pressure bottle 8 and the control unit 4, then air flows generated at different positions in the aero-engine enter the pressure guiding pipes 2 through air cavities of the air pressure collecting pieces 1 and then enter inner cavities of the pressure scanning valve body 3, communicated with the measuring ports, through the measuring ports 5 connected with the pressure guiding pipes 2 in a one-to-one correspondence mode. The EEPROM of the pressure scanning valve body 3 records the pressure information of each measuring port 5, and then the control unit 4 carries out data operations such as pressure value calibration and pressure change analysis, so that a tester can know the pressure information of each position inside the aircraft engine corresponding to each pressure acquisition part 1.
However, the pressure guiding pipe 2 is a nylon pipe, the outlet pipe 6 connected with the pressure guiding pipe 2 by the air pressure collecting piece 1 is a stainless steel pipe, the two pipes are inserted and the sealing of the interface is realized by the tolerance fit of the inner diameter and the outer diameter of the two pipes and the external sleeve pressure fastening steel ring, the junction 7 often has serious problems of air leakage due to differences in materials, human error and the like, and it is difficult to find whether air leaks at the interface before the test of the vehicle platform of the aeroengine by artificially detecting the connectivity of the interface, and after the test is started, because the number of the air pressure collecting pieces 1 and the pressure guiding pipes 2 is as many as hundreds of pressure guiding pipes, the air pressure measuring points are all single measuring points which are distributed in a scattered way, no reference comparison is needed, if the air flow leakage exists in a certain pressure guiding pipe 2, the judgment is difficult, and the leakage of the plurality of pressure leading pipes 2 can cause great interference to the measurement result of the pneumatic pressure, and the reliability and the measurement precision of the test result of the aero-engine are seriously influenced.
Therefore, how to perform accurate leakage detection on the pneumatic pressure measurement device before the aircraft engine is subjected to the vehicle-mounted test so as to check whether the connection of each pressure guiding pipe is qualified or not and ensure the reliability and the precision of the measurement result of the pneumatic pressure measurement device becomes a problem to be solved by technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a gas leakage detection device, it can be applicable to pneumatic pressure measurement device, not only can carry out the accurate detection of leakage state to each draw the junction of pipe and atmospheric pressure collection piece, can also measure, take notes and show leakage rate to whether the connection that supplies each draw the pipe audio-visual provides the data foundation when learning that each draws the pipe is qualified and carrying out pneumatic pressure measurement for pneumatic pressure measurement device.
The utility model provides a pair of gas leakage detection device for detect pneumatic pressure measuring device's leakage situation, pneumatic pressure measuring device includes that a plurality of atmospheric pressure gather piece, first end one-to-one ground and a plurality of the leading-out pipe that the atmospheric pressure gathered the piece is connected presses pipe and pressure scanning valve system, pressure scanning valve system includes a plurality of pressure scanning valve bodies, each pressure scanning valve body all be provided with the measurement port that the second end one-to-one of leading-in pipe is connected reaches can with a plurality of measure port intercommunication and the gas outlet that blocks, include:
the gas storage cylinder is communicated with the gas outlet of each pressure scanning valve body, high-pressure detection gas is stored in the gas storage cylinder, and a valve for connecting and disconnecting the gas storage cylinder and the gas outlet is arranged; the gas collecting box is sleeved at the joint of the pressure guiding pipe and the air pressure collecting piece and is provided with an inner cavity for accommodating the joint of the pressure guiding pipe and the outlet pipe of the air pressure collecting piece and openings which are communicated with the inner cavity and are respectively used for the pressure guiding pipe and the outlet pipe to extend out; and the gas leakage detector is communicated with the inner cavity of the gas collection box and can detect the detection gas in the gas storage bottle, and the gas leakage detector can detect, record and display the leakage rate of the detection gas.
Preferably, the opening of the gas collecting box is provided with a sealing gasket integrally connected with the gas collecting box.
Preferably, the gas collecting box is provided with a box body with a concave cavity and a box cover for sealing the opening of the concave cavity, and the box cover can be connected to the box body in an openable manner.
Preferably, the valve of the gas cylinder is provided as a pressure regulating valve.
Preferably, the pressure control device further comprises a valve controller electrically connected with the pressure regulating valve and used for controlling the opening and closing of the valve of the pressure regulating valve.
Preferably, the pressure regulating valve further comprises a pressure gauge arranged at an outlet end of the pressure regulating valve.
Preferably, the gas leakage detector is provided with a vacuum pump and a chamber for accommodating the vacuum pump, a detection element of the gas leakage detector is arranged in the chamber, the chamber is provided with two gas inlet ports, and the gas collection box is communicated with the chamber through one gas inlet port.
Preferably, the detection gas is helium gas, and the gas leakage detector is helium mass spectrometer leak detector.
Preferably, the detection gas is a mixture of helium and nitrogen, and the gas leak detector is a helium mass spectrometer leak detector.
Preferably, the detection gas is a mixture of hydrogen and nitrogen, and the gas leak detector is a hydrogen-helium mass spectrometer leak detector.
The utility model provides an among the technical scheme, gas leakage detection device for detect pneumatic pressure measuring device's leakage state and be connected with pneumatic pressure measuring device, establish gas bomb, the cover that is linked together with pneumatic pressure measuring device's pressure scanning valve body's gas outlet and establish the gas collection box of the junction of the pressure tube of pneumatic pressure measuring device and atmospheric pressure collection piece, with the gas leakage detector of the inner chamber intercommunication of gas collection box.
The gas storage cylinder is internally stored with high-pressure detection gas, and after a valve of the gas storage cylinder is opened, the detection gas can enter an inner cavity of a valve body of the pressure scanning valve, which is communicated with each measurement port, and then enters a pressure guide pipe through the measurement port, and flows through the joint of the pressure guide pipe and the air pressure acquisition part; the gas collection box is provided with a closed inner cavity, if the joint of the pressure guiding pipe and the air pressure collecting piece leaks, the detected gas can enter the inner cavity of the gas collection box and the leakage rate is detected by a gas leakage detector communicated with the inner cavity of the gas collection box; the pressure scanning valve system can control the opening and closing of each measuring port of the pressure scanning valve body, then can realize opening and closing each measuring port in proper order, because the pressure guiding pipe is connected with the measuring port one-to-one, each pressure guiding pipe can be conducted in proper order, it can enter into each pressure guiding pipe in proper order to detect out through the gas leakage detector whether each pressure guiding pipe leaks with the junction of atmospheric pressure collection piece, and can record and show the gas leakage rate of every junction, thereby operating personnel can audio-visually obtain whether the leakage rate is in the scope of predetermineeing, whether the connection of each pressure guiding pipe is qualified result, and simultaneously, each leakage rate value can provide the data compensation foundation for pneumatic pressure measuring device's measuring result.
According to the configuration, the utility model provides a gas leakage detection device is applicable to pneumatic pressure measurement device, not only can carry out the accurate detection of leakage state to each draw the junction of pressing pipe and atmospheric pressure collection piece, can also measure, take notes and show the leakage rate who draws the pipe to whether the connection that supplies operating personnel audio-visual to learn each draw and press the pipe is qualified and provide the data foundation when carrying out pneumatic pressure measurement for pneumatic pressure measurement device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art pneumatic pressure measurement device;
fig. 2 is a schematic structural diagram of the gas leakage detecting device in the embodiment of the present invention.
In FIGS. 1-2:
the gas pressure acquisition device comprises a gas pressure acquisition part-1, a pressure leading pipe-2, a pressure scanning valve body-3, a gas storage bottle-301, a valve-302, a valve controller-303, a control unit-4, a measurement port-5, a leading-out pipe-6, a joint-7, a gas collection box-701, a gas leakage detector-702, a gas pressure bottle-8 and a gas outlet-9.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The purpose of this embodiment is to provide a gas leakage detection device, is applicable to pneumatic pressure measurement device, not only can carry out the accurate detection of leakage state to each pressure pipe and the junction of atmospheric pressure collection piece, can also measure, take notes and show leakage rate to whether the connection that supplies operating personnel audio-visual to learn each pressure pipe is qualified and provide the data basis when carrying out pneumatic pressure measurement for pneumatic pressure measurement device.
Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.
As shown in fig. 2, the gas leakage detection device provided in this embodiment is suitable for the pneumatic pressure measurement device shown in fig. 1, and can measure whether the connection status of each pressure guiding pipe 2 of the pneumatic pressure measurement device is qualified. As shown in fig. 1 or fig. 2, the pneumatic pressure measuring device is provided with a plurality of pressure collecting members 1, pressure introducing pipes 2 corresponding to the pressure collecting members 1 one by one, and a pressure scanning valve system, wherein the pressure scanning valve system comprises pressure scanning valve bodies 3 connected with the pressure introducing pipes 2, pressure bottles 8 communicated with the pressure scanning valve bodies 3, and a control unit 4 in communication connection with the pressure scanning valve bodies 3. Each pressure scanning valve body 3 is provided with a plurality of measurement ports 5 which are connected with the pressure leading pipes 2 in a one-to-one correspondence manner, each measurement port 5 of the pressure scanning valve body 3 is communicated with an air cavity of the pressure scanning valve body 3, and the air cavity is provided with an air outlet 9. In practical application, the number of the pressure leading pipes 2 is hundreds or thousands, a plurality of pressure scanning valve bodies 3 are needed, and each pressure scanning valve body 3 can be connected with the gas outlets 9 of every two adjacent pressure scanning valve bodies 3 or one measuring port 5 of each pressure scanning valve body through gas guide pipes to realize mutual communication. The gas pressure bottle 8 can be communicated with each pressure scanning valve body 3 through a measuring port 5 or a gas outlet 9, so that high-pressure gas in the gas pressure bottle 8 enters a gas cavity of the pressure scanning valve body 3. Each measuring port 5 of the pressure scanning valve body 3 is a pneumatic valve, and comprises a solenoid valve and a pneumatic valve actuator. The high pressure gas in the air pressure bottle 8 can make the pneumatic valve controller open, and the control unit 4 is used as a part of the pressure scanning valve system, and can control the opening and closing of each measuring port 5 of the pressure scanning valve body 3 individually by controlling the on-off of the electromagnetic valve and the air outlet 9.
As shown in fig. 2, the gas leakage detecting device provided in this embodiment includes a gas bomb 301 communicated with the gas outlet 9 of the pressure scanning valve body 3 of the pneumatic pressure measuring device, a gas collecting box 701 having a closed inner cavity and sleeved at the joint 7 of the pressure guiding pipe 2 and the gas pressure collecting member 1, and a gas leakage detector 702 communicated with the inner cavity of the gas collecting box 701.
Wherein, the gas bomb 301 is stored with high pressure detection gas, and the gas bomb 301 is provided with a valve 302 which can switch on or cut off the flow state of the detection gas. After the valve 302 of the gas bomb 301 is opened, the detection gas can enter the gas cavity communicated with each measurement port 5 through the gas outlet 9 of the pressure scanning valve body 3. The individual measuring ports 5 can be opened in turn by means of the control function of the pressure scanning valve system itself of the pneumatic pressure measuring device. When each measuring port 5 is opened and closed in sequence, each pressure guiding pipe 2 can be conducted in sequence because the pressure guiding pipes 2 are connected with the measuring ports 5 in a one-to-one correspondence mode, and detection gas can enter each pressure guiding pipe 2 in sequence and flows through the connecting part 7 of the pressure guiding pipe 2 and the air pressure collecting part 1. The gas collecting box 701 is provided with a closed inner cavity for accommodating a connecting part 7 of the pressure guiding pipe 2 and the air pressure collecting piece 1; the gas leakage detector 702 has a detection element capable of sensing detection gas, a vacuum pump, and a chamber for accommodating the vacuum pump, the detection element is located in the chamber, the chamber is communicated with the inner cavity of the gas collection box 701, and the inner cavity of the gas collection box 701 can be extracted into a vacuum region or a negative pressure region through the vacuum pump. If the joint 7 of a certain pressure guiding pipe 2 and the air pressure collecting piece 1 leaks, the detection gas can enter the inner cavity of the gas collecting box 701 from the leakage point and further enter the cavity, and can be sensed by the detection element of the gas leakage detector 702, so that whether the joint 7 of each pressure guiding pipe 2 and the air pressure collecting piece 1 leaks or not can be detected through the gas leakage detector 702. Meanwhile, the gas leakage detector 702 can also detect, record and display the gas leakage rate, and an operator can visually know the comparison result of whether the leakage rate is within a preset range and whether the connection of each pressure guiding pipe 2 is qualified by comparing each displayed leakage rate value with a standard leakage rate value; the recorded leakage rates can be checked by testers so as to obtain the magnitude of the leakage rate value and the influence of the magnitude on a pressure measurement value in a pneumatic pressure measurement test, and a data basis is provided for a measurement result of the pneumatic pressure measurement device.
With such arrangement, the gas leakage detection device provided by the embodiment is suitable for a pneumatic pressure measurement device, and by utilizing the structural characteristics of a pressure scanning valve system of the pneumatic pressure measurement device, not only can the accurate detection of the leakage state be performed on the joint 7 of each pressure guiding pipe 2 and the air pressure collecting part 1, but also the leakage rate of the pressure guiding pipes 2 can be measured, recorded and displayed, so that an operator can visually know whether the connection of each pressure guiding pipe 2 is qualified or not and provide data basis for the pneumatic pressure measurement of the pneumatic pressure measurement device; and the whole detection process realizes automatic control and automatic judgment on whether the connection of the pressure guiding pipe 2 is qualified or not, and avoids the influence on the detection result caused by manual misoperation.
Specifically, the gas collecting box 701 is provided with a box body with a concave cavity and a box cover capable of sealing an opening of the concave cavity, and the box cover and the box body are connected in an openable mode. The box cover and the box body are closed to form a closed inner cavity of the gas collecting box 701, when the box cover is opened, the connecting part 7 of the pressure guiding pipe 2 and the eduction pipe 6 of the air pressure collecting piece 1 can be placed into the inner cavity, the pressure guiding pipe 2 and the eduction pipe 6 respectively extend out through an opening in the gas collecting box 701, and a sealing piece is arranged at the opening to seal the opening and avoid damaging the closed inner cavity. The sealing element can be a sealing gasket integrally connected with the gas collecting box 701, so that the sealing effect is ensured, and the sealing gasket can be prevented from falling off.
The pressure of the detection gas in the gas cylinder 301 can be realized by compressing the gas in the gas cylinder 301 when the detection gas is stored in the gas cylinder 301; the valve 302 of the gas cylinder 301 may be disposed on the body of the gas cylinder 301 or on a pipe connecting the gas cylinder 301 and the pressure scanning valve body 3. The gas storage cylinder 301 may be set as one communicating with all the pressure scanning valve bodies 3, or may be a plurality of communicating with a plurality of pressure scanning valve bodies 3, depending on the actual situation.
The valve 302 of the gas bomb 301 may also be set as a pressure regulating valve to ensure that the detection gas introduced into the valve body 3 of the pressure scanning valve has a preset positive pressure value. The opening and closing of the pressure regulating valve can be manually regulated and set by an operator or can be remotely controlled by connecting the valve controller 303, so that the operation convenience is provided for the operator.
Further, can also set up the pressure gauge at pressure regulating valve's exit end, the pressure gauge can measure and show the gas pressure value of pressure regulating valve's exit end, can supply operating personnel to look over in real time to make operating personnel can be accurate learn the pressure that lets in the gas in the pressure scanning valve body 3, adjust and control gas pressure regulating valve when needs.
In the prior art, a chamber of the gas leakage detector 702, which accommodates the vacuum pump, is provided with an air inlet port, the air inlet port is connected with a suction gun, the suction gun can be held by an operator, and an opening of the suction gun can be used as a detection port of the gas leakage detector 702. The inner cavity of the gas collecting box 701 can be communicated with the cavity through the opening of the suction gun; the gas leakage detector 702 is provided with the detection port of the suction gun except the detection port of the gas collection box 701, and can perform leakage detection on other joints of the pneumatic pressure measuring device, such as the joint of the pressure guiding pipe 2 and the measurement port 5.
Specifically, the detection gas may be helium gas, or a mixture of helium gas and nitrogen gas, or a mixture of hydrogen gas and nitrogen gas, and correspondingly, the gas leak detector 702 may be provided as a helium mass spectrometer leak detector or a hydrogen helium mass spectrometer leak detector. The chemical properties of the nitrogen and the helium are inactive, the chemical property of the mixed gas of the hydrogen and the nitrogen is also inactive, the mixed gas is not combined with other elements or compounds under the normal state, and the hydrogen and the helium are easy to detect, so that the three are used as detection gases, and the detection gases have higher safety and practicability.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a gas leakage detection device for detect pneumatic pressure measuring device's leakage situation, pneumatic pressure measuring device includes that a plurality of atmospheric pressure gather piece (1), first end one-to-one ground and a plurality of pressure pipes (2) and pressure scanning valve system that eduction tube (6) of a plurality of atmospheric pressure gather piece (1) are connected, pressure scanning valve system includes a plurality of pressure scanning valve body (3), each pressure scanning valve body (3) all be provided with measurement port (5) that the second end one-to-one of pressure pipes (2) is connected and can with a plurality of gas outlet (9) that measurement port (5) communicate and block, its characterized in that includes:
the gas storage cylinder (301) is communicated with the gas outlet (9) of each pressure scanning valve body (3), high-pressure detection gas is stored in the gas storage cylinder (301), and a valve (302) used for conducting and cutting off connection between the gas storage cylinder and the gas outlet (9) is arranged;
the gas collecting box (701) is sleeved at the joint (7) of the pressure guiding pipe (2) and the air pressure collecting piece (1), and the gas collecting box (701) is provided with an inner cavity for accommodating the joint of the pressure guiding pipe (2) and the outlet pipe (6) of the air pressure collecting piece (1) and openings which are communicated with the inner cavity and are respectively used for the pressure guiding pipe (2) and the outlet pipe (6) to extend out;
and the gas leakage detector (702) is communicated with the inner cavity of the gas collecting box (701) and can detect the detection gas in the gas storage bottle (301), and the gas leakage detector (702) can detect, record and display the leakage rate of the detection gas.
2. The gas leak detection device according to claim 1, wherein the openings of the gas collection box (701) are each provided with a gasket integrally connected to the gas collection box (701).
3. The gas leak detection device according to claim 1, wherein the gas collecting box (701) is provided with a box body having a cavity and a box cover sealing an opening of the cavity, the box cover being openably and closably connected to the box body.
4. The gas leak detection device according to claim 1, wherein the valve (302) of the gas cylinder (301) is provided as a pressure regulating valve.
5. The gas leak detecting apparatus according to claim 4, further comprising a valve controller (303) electrically connected to the pressure regulating valve for controlling opening and closing of a valve of the pressure regulating valve.
6. The gas leak detecting apparatus according to claim 4, further comprising a pressure gauge provided at an outlet end of the pressure regulating valve.
7. The gas leak detecting apparatus according to claim 1, wherein the gas leak detector (702) is provided with a vacuum pump and a chamber accommodating the vacuum pump, the detecting element of the gas leak detector (702) is provided in the chamber, the chamber is provided with two gas inlet ports and the gas collecting box (701) communicates with the chamber through one of the gas inlet ports.
8. The gas leak detection apparatus of claim 1, wherein the detection gas is provided as helium gas and the gas leak detector (702) is provided as a helium mass spectrometer leak detector.
9. The gas leak detection apparatus according to claim 1, wherein the detection gas is provided as a mixture of helium and nitrogen, and the gas leak detector (702) is provided as a helium mass spectrometer leak detector.
10. The gas leak detection apparatus according to claim 1, wherein the detection gas is provided as a mixture of hydrogen and nitrogen, and the gas leak detector (702) is provided as a hydrogen-helium mass spectrometer leak detector.
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| CN201920961036.4U CN209858151U (en) | 2019-06-25 | 2019-06-25 | Gas leakage detection device |
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| CN201920961036.4U CN209858151U (en) | 2019-06-25 | 2019-06-25 | Gas leakage detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146233A (en) * | 2019-06-25 | 2019-08-20 | 杨哲 | Gas leak detection apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146233A (en) * | 2019-06-25 | 2019-08-20 | 杨哲 | Gas leak detection apparatus |
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