CN219302059U - Portable gas production device - Google Patents
Portable gas production device Download PDFInfo
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- CN219302059U CN219302059U CN202223036148.XU CN202223036148U CN219302059U CN 219302059 U CN219302059 U CN 219302059U CN 202223036148 U CN202223036148 U CN 202223036148U CN 219302059 U CN219302059 U CN 219302059U
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- bottle
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- flow controller
- sample bag
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The utility model relates to a portable gas collection device, which comprises a gas collection bottle and a sample container, and is characterized in that the gas collection bottle comprises a bottle body, a bottle cap, a first airflow controller and a second airflow controller which are connected with each other; the sample container comprises a sample bag, a straight-through joint and a nut; the inside of the sample bag is provided with a nut, the upper side of the sample bag is provided with a sample bag through hole, and the lower part of the straight-through joint is in threaded connection with the nut inside the sample bag through hole; the upper part of the straight joint is in threaded connection with the bottle cap; the first airflow controller is arranged on the bottle body, and the second airflow controller is arranged on the bottle cover; the second air flow controller interface is communicated with the inside of the straight-through joint interface. The utility model has low cost on the premise of ensuring the stable storage of the components of the gas sample, and can realize the long-term storage and long-distance transportation of the sample.
Description
Technical Field
The utility model relates to the technical field of sampling devices, in particular to a portable gas sampling device, which is simple in gas sampling process and convenient to transport.
Background
In many fields such as indoor and outdoor environment monitoring and gas analysis, the concentration of gas is generally required for detection and analysis, and thus gas sampling is an indispensable process, and the collected gas sample is injected into a professional analyzer for analysis.
The gas sample collecting device at present is mainly a gamma tank, the inner surface of the gamma tank is subjected to silanization passivation treatment to ensure that the components are kept stable in storage, but the surface passivation treatment technology also makes the gamma tank expensive in cost, further causes high gas sample collecting cost, and therefore, under the premise of ensuring stable storage of the components of the gas sample, a reliable gas collecting device needs to be developed to solve the problems.
The utility model patent with the application number of CN 214472104U discloses a malodorous gas negative pressure collecting device, a vacuum pump is arranged in the device, a vacuum environment can be built in a barrel body, ambient air is sucked into an air bag fixed in the whole body by utilizing pressure difference, and sample collection is completed, but the device has a plurality of limitations, and the problems are as follows:
(1) After the air sample is full of the air bag, the air bag cannot be attached to the inner wall of the barrel body, the barrel body can always keep a negative pressure state, so that air in the air bag can permeate into the barrel body through an interface of the air bag to ensure air pressure balance, stable storage of components of the air sample cannot be ensured, and errors exist in analysis results of the sample.
(2) The barrel body is made of plastic, is easy to damage in the transportation process, and is not suitable for long-distance transportation.
(3) Electronic parts such as a vacuum pump, an electromagnetic valve, a battery and the like are arranged at the lower side of the barrel body of each device, so that the operation and maintenance cost of each device is increased.
The utility model patent with the application number of CN 210465049U discloses a dual-purpose unpowered instantaneous gas sampling bottle, the sampling principle of the sampling bottle is basically the same as that of the malodorous gas negative pressure collecting device, the difference is that whether an air bag exists in the sampling bottle can be sampled, but the main body of the sampling bottle is made of borosilicate glass, the sampling bottle belongs to fragile products, is still not suitable for long-distance transportation, and the air bag still cannot be attached to the sampling bottle, so that the problems still exist.
Disclosure of Invention
The utility model aims to make up for the defects of the prior art and provides a portable sampling device. The specific technical scheme is as follows:
a portable gas collection device comprises a gas collection bottle and a sample container, and is characterized in that the gas collection bottle comprises a bottle body 21, a bottle cap 22, a first gas flow controller 25 and a second gas flow controller 26 which are connected with each other;
the bottle body 21 is connected with the bottle cap 22;
the sample container 3 comprises a sample bag 31, a straight-through connector 32 and a nut 33;
a nut 33 is arranged in the sample bag 31, a sample bag through hole is formed in the upper side of the sample bag 31, and the lower part of the straight joint 32 is in threaded connection with the nut 33 in the sample bag 31 through the sample bag through hole; the upper part of the through joint 32 is in threaded connection with the bottle cap 22;
the first air flow controller 25 is disposed at the upper side of the bottle body 21, and the second air flow controller 26 is disposed at the upper side of the bottle cap 22; the second air flow controller interface 221 communicates with the interior of the straight through connector interface 222;
the first air flow controller 25 and the second air flow controller 26 are respectively provided with an air inlet for connecting with an air extraction opening of the external vacuum generating device 4; the first airflow controller 25 is used for controlling the communication and disconnection between the interior of the bottle body and the outside ambient air; the second air flow controller 26 is used for controlling the communication and disconnection between the inside of the sample container and the outside environment air;
each connecting part is in sealing connection.
Further, the sampling bottle further includes an air pressure monitor 27 provided on the bottle body.
Further, the sampling bottle is also provided with a pressure lock 23, and the bottle cap 22 is fixedly connected with the bottle body 21 through the pressure lock 23.
Further, body 21 includes a cap interface 211 with a top surface provided with a top surface flange 2111, and a bottom surface flange 222 is provided along the lower edge of cap 22; the inner wall of the pressure lock 23 mates with the top flange 2111 of the closure interface and the bottom flange 222 of the closure.
Further, the top end flange 2111 of the cap interface is provided with a seal ring mounting groove 2112 for fixing the first O-ring 24, and the body 21 and the cap 22 are sealingly connected by the first O-ring 24.
Further, the first airflow controller 25 and the second airflow controller 26 are stainless steel ball valves.
Further, the sample container further comprises a second O-ring 34 arranged inside the sample bag 31 and a third O-ring 35 arranged outside the sample bag 31, and the through opening of the sample bag is tightly pressed by the nut 33 and the through joint 32 so as to ensure the integral air tightness of the sample container 3.
Further, the air pressure monitor 27 is specifically a pressure gauge.
Further, the bottle body 21 is a stainless steel can body; the bottle cap 22 is made of stainless steel metal.
Further, the sample bag 31 is a sample bag of polytetrafluoroethylene material.
The utility model improves on the basis of the existing Suma tank and instantaneous gas sampling bottle, adopts a double-layer structure, the inner layer is a polytetrafluoroethylene material sample bag, the outer layer is a steel bottle, and the utility model has low cost and can realize long-term preservation and long-distance transportation of the sample on the premise of ensuring stable storage of the components of the gas sample.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a gas production device
FIG. 2 is a schematic view of a gas cylinder
FIG. 3 is a schematic view of the structure of a bottle body
Fig. 4 is a schematic view of a connection structure between a bottle cap and a bottle body
FIG. 5 is a schematic diagram showing the connection structure of the air flow controller and the bottle body
FIG. 6 is a schematic diagram showing the connection structure of the air pressure monitor and the bottle body
FIG. 7 is a schematic view of a sample container
FIG. 8 is a schematic view of the structure of each connection part of the gas production device
FIG. 9 is a schematic diagram showing connection of a vacuum generator
Drawing reference numerals
First O-ring 24 first airflow controller 25
Second air flow controller 26 air pressure monitor 27
Air pressure monitor interface 212 of bottle cap interface 211
Seal ring mounting groove 2112 second air flow controller interface 221
Pointer 271 sample container 3
Straight-through joint 32 of sample bag 31
Second O-ring 34 of nut 33
Third O-ring 35 vacuum generator 4
Detailed Description
FIG. 1 is a schematic diagram of the overall structure of a gas production device
The portable gas sampling device comprises a gas sampling cylinder 2 and a sample container 3, wherein the sample container 3 is arranged in the gas sampling cylinder 2, ambient air can flow into the sample container 3 to serve as a sample to be detected for detection and analysis, and the sample container 3 can be completely attached to the inner wall of the gas sampling cylinder 2 after the sample container 3 is filled with the ambient air.
FIG. 2 is a schematic view of a gas cylinder
The gas collecting bottle 2 comprises a bottle body 21, a bottle cap 22, a pressure lock 23, a first O-shaped sealing ring 24, a first gas flow controller 25, a second gas flow controller 26 and a gas pressure monitor 27, wherein the first O-shaped sealing ring 24 is arranged at the joint of the bottle body 21 and the bottle cap 22, the bottle cap 22 is fixed with the bottle body 21 through the pressure lock 23, the gas pressure monitor 27 and the first gas flow controller 25 are arranged on the upper side of the bottle body 21, the second gas flow controller 26 is arranged on the upper side of the bottle cap 22, and all the joint parts are subjected to sealing treatment (the specific treatment method is described below), and when the first gas flow controller 25 blocks the air communication relation between the external environment and the interior of the gas collecting bottle 2, the interior of the whole gas collecting bottle 2 is in a completely closed state.
FIG. 3 is a schematic view of the structure of a bottle body
The bottle body 21 is specifically a can body made of 316 stainless steel metal material, the appearance shape of the bottle body 21 is mainly attractive, the bottle body has certain rigidity, and the bottle body has deformation resistance under the condition that pressure difference exists between the inner side and the outer side of the bottle body 21.
The bottle body 21 is welded with three interfaces, including a bottle cap interface 211, an air pressure monitor interface 212 and a first air flow controller 213 interface, wherein the bottle cap interface 211 is positioned at the right middle of the upper side of the bottle body 21, the air pressure monitor interface 212 is positioned at the left side of the bottle cap interface 211, and the first air flow controller 213 interface is positioned at the right side of the bottle cap interface 211.
The top end of the cap interface 211 is provided with a flange 2111 which can be connected with the cap 22 through a pressure lock 23, and in addition, a sealing ring mounting groove 2112 is arranged in the middle of the top end flange 2111 of the cap interface, and a first O-shaped sealing ring 24 can be mounted.
The first airflow controller interface 213 and the air pressure monitor interface 212 are screwed to the first airflow controller 25 and the air pressure monitor 27, respectively.
Fig. 4 is a schematic view of a connection structure between a bottle cap and a bottle body
The bottle cap 22 of the gas collecting bottle is specifically formed by processing 316 stainless steel metal materials, a second air flow controller interface 221 is welded at the middle position of the upper side of the bottle cap 22 and can be connected with the second air flow controller 26 through threads, the lower side of the bottle cap 22 is connected with the through joint 32 through threads, the other side of the through joint 32 is connected with the sample container 3 through threads, the second air flow controller interface 221 is communicated with the inside of the through joint 32, and air can flow into the sample container 3 from the second air flow controller interface 221, and vice versa.
The bottom flange 222 is arranged at the lower side of the bottle cap 22, the position and the size of the bottom flange 222 correspond to the top flange 2111 of the bottle cap interface 211, the bottom flange 222 of the bottle cap 22 can be connected with the bottle cap interface 211 through the pressure lock 23, the middle of the bottom flange 222 is provided with a sealing ring extrusion groove 223, the position and the size of the sealing ring extrusion groove correspond to the sealing ring installation groove 2112 of the bottle cap interface 211, after the first O-shaped sealing ring 24 is installed in the sealing ring installation groove 2112 of the bottle cap interface 211, the bottle cap 22 is buckled with the bottle cap interface 211, and the sealing ring extrusion groove 223 can ensure the air tightness of the connection between the bottle cap 22 and the bottle body 21 through extruding the first O-shaped sealing ring 24.
In addition, the pressure lock 23 is specifically a fast-assembling clamp made of 316 stainless steel metal, which is respectively connected with the bottle cap interface 211 and the bottle cap 22, and can lock the connection part of the bottle cap 22 and the bottle body interface 21 through a screw, and then is matched with the first O-shaped sealing ring 24, so that the air tightness of the connection between the bottle cap 22 and the bottle body 21 can be ensured to the greatest extent.
FIG. 5 is a schematic diagram showing the connection structure of the air flow controller and the bottle body
The first airflow controller 25 and the second airflow controller 26 are specifically 316 stainless steel valves, one end of the first airflow controller 25 can be connected with a pipeline through a clamping sleeve, the other end of the first airflow controller 25 can be connected with a first airflow controller interface 213 on the upper side of the bottle body 21 in a threaded manner, a valve knob of the first airflow controller 25 can control the air circulation in the bottle body 21, the valves are opened, and the interior of the bottle body 21 is communicated with the outside environment air; the valve is closed, and the communication relationship between the interior of the bottle body 21 and the outside ambient air is cut off.
The second air flow controller 26 has the same structure as the first air flow controller 25, one end of the second air flow controller 26 is connected with a pipeline through a clamping sleeve, the other end of the second air flow controller is in threaded connection with a second air flow controller interface 221 positioned at the right middle position of the upper side of the bottle cap 22, the lower side of the bottle cap 22 is connected with the sample container 3 through a through joint 32, a valve of the second air flow controller 26 can control the air circulation of the sample container 3, the valve is opened, and the sample container 3 is communicated with the outside environment air; the valve is closed, and the communication relationship between the sample container 3 and the outside ambient air is cut off.
FIG. 6 is a schematic diagram showing the connection structure of the air pressure monitor and the bottle body
The air pressure monitor 27 is specifically a pressure gauge, and can observe the air pressure change condition inside the bottle body 21 in real time, when the pointer 271 of the air pressure monitor 27 is at the "0" position, the pressure inside the bottle body 21 is the same as the pressure of the air in the external environment, and when the pointer 271 of the air pressure monitor 27 is at the "-0.1" position, the inside of the bottle body 21 is in a vacuum state.
The underside of the air pressure monitor 27 may be threadably connected to an air pressure monitor interface 212 on the body 21.
FIG. 7 is a schematic view of a sample container
The sample container 3 comprises a sample bag 31, a through-connection 32, a nut 33, a second O-ring 34 and a third O-ring 35.
The sample bag 31 is made of polytetrafluoroethylene material, has good physical and chemical properties, can effectively prevent sample adsorption and the inner wall of the sample bag, ensures the stability of the sample in storage, and is basically consistent with the performance of an imported agave tank circulated in the market.
The inside of the sample bag 31 is provided with a nut 33 and a second O-shaped sealing ring 34, the middle position of the upper side of the sample bag 31 is provided with a sample bag penetrating opening, the outside of the sample bag 31 is provided with a through joint 32 and a third O-shaped sealing ring 35, the lower side of the through joint 32 can be connected with the nut 33 in the sample bag 31 through the sample bag penetrating opening in a threaded manner, and the upper side of the through joint 32 can be connected with the lower side of the bottle cap 22 in a threaded manner.
The second O-shaped sealing ring 34 and the third O-shaped sealing ring 35 are respectively positioned at the inner side and the outer side of the sample bag 31, and the sample bag interface 311 can be tightly pressed by the nut 33 and the through joint 32, so that the integral air tightness of the sample container 3 is ensured.
The sample bag 31 is approximately rectangular when not in use, the sample bag 31 is put into the gas collection bottle 2, and the sample bag 31 is full of gas and is consistent with the shape and size of the inner wall of the bottle body 21, so that the sample bag can be completely attached to the inner wall of the bottle body 21.
FIG. 8 is a schematic diagram of the structure of each connecting part of the gas production device.
The gas sampling device mainly uses the principle of negative pressure gas sampling, namely, the pressure difference between the inner side and the outer side of the gas sampling device is utilized to force the external environment air to flow into the gas sampling device so as to achieve the purpose of gas sampling.
In order to ensure that the air pressure difference exists inside and outside the air collecting device, the air tightness of the whole air collecting device is required to be ensured, and the air tightness of the connecting parts of each part of the air collecting device is required to be ensured, which specifically comprises the following steps:
(1) The air tightness of the connection part of the sample bag 31 and the through joint 32;
(2) The air tightness of the connecting part of the through joint 32 and the bottle cap 22;
(3) The air tightness of the connecting part of the bottle cap 22 and the bottle body 21;
(4) The air tightness of the connecting part of the bottle cap 22 and the second air flow controller 26;
(5) Air tightness of connection part of bottle body 21 and first air flow controller 25
(6) The air tightness of the connection part of the bottle body 21 and the air pressure monitor 27,
the specific connection mode is as follows:
(1) The inside nut 33 and the second O type sealing washer 34 that have of sample bag 31, the outside has through joint 32 and third O type sealing washer 35, has a sample bag through-hole in the middle of the upper side of air pocket, and the through joint 32 downside has the screw thread to stretch into the inside of sample bag 31 and be connected with nut 33 through the sample bag through-hole, simultaneously, is located the inside and outside of sample bag 31 second O type sealing washer 34 and third O type sealing washer 35 and compresses tightly sample bag interface 311, guarantees the holistic gas tightness of sample container 3.
(2) The upper side of the through joint 32 is in threaded connection with the lower side of the bottle cap 22, and a raw material belt is wound at the threaded connection position, so that the raw material belt can fill gaps between the threaded connections, and the air tightness of the connection position is ensured.
(3) The first O-ring 24 is placed in the seal ring installation groove 2112 on the top surface of the bottle cap interface 211, the bottom flange 222 on the lower side of the bottle cap 22 is aligned and buckled with the top flange 2111 of the bottle cap interface 211, and is locked by the pressure lock 23, and at this time, the seal ring extrusion groove 223 on the lower side of the bottle cap 22 can extrude the first O-ring 24, so as to ensure the air tightness of the connection part.
(4) The second air flow controller interface 221 on the upper side of the bottle cap 22 is in threaded connection with the second air flow controller 26, and the thread connection position is wrapped with a raw material belt, so that the air tightness of the connection position is ensured.
(5) The first air flow controller interface 213 on the upper side of the bottle body 21 is screwed with the first air flow controller 25, and the thread connection position is wrapped with a raw material tape to ensure the air tightness of the connection part.
(6) The air pressure monitor interface 212 on the upper side of the bottle body 21 is in threaded connection with the air pressure monitor 27, and the thread connection position is wrapped with a raw material belt, so that the air tightness of the connection position is ensured.
Fig. 9 is a schematic diagram of connection of the vacuum generating device.
The utility model is also matched with a vacuum generating device 4, which can create a vacuum environment for the gas collecting bottle 2 and the sample container 3, wherein the vacuum generating device 4 is provided with an exhaust port and two exhaust ports, one exhaust port is connected with a first air flow controller 25 through an air pipe, and the other exhaust port is connected with a second air flow controller 26 through an air pipe.
After the valve of the first air flow controller 25 is opened and the control switch of the vacuum generating device 4 is opened, the air in the air collecting bottle 2 can be pumped out; after opening the valve of the second air flow controller 26 and the control switch of the vacuum generating device 4, the air inside the sample container 3 can be evacuated.
The utility model also provides a gas sample gas collection method of the portable gas collection device, which comprises the following specific processes:
(1) Negative pressure preparation stage
S1-1: the gas sampling device and the vacuum generating device 4 are connected through the gas pipe, and the valve of the second gas flow controller 26, the valve of the first gas flow controller 25 and the control switch of the vacuum generating device 4 are all in a closed state.
S1-2: the valve of the second air flow controller 26 and the control switch of the vacuum generating device 4 are opened, the residual air in the sample container 3 is extracted, and after the extraction is completed, the valve of the second air flow controller 26 and the control switch of the vacuum generating device 4 are closed.
S1-3: the valve of the first air flow controller 25 and the control switch of the vacuum generating device 4 are opened, the air in the air bottle 2 is pumped out, the pointer 271 of the air pressure monitor 27 is observed, when the pointer 271 of the air pressure monitor rotates to the '0.1' position, the air in the air bottle 2 is vacuumized, the valve of the first air flow controller 25 and the control switch of the vacuum generating device 4 are closed, and the negative pressure preparation stage is completed.
(1) Sample collection stage
S2-1: the gas sampling device is transported to a designated sampling point, the valve of the second gas flow controller 26 is opened, the external environment is atmospheric pressure due to the vacuum inside the gas sampling device, the external atmospheric pressure is larger than the internal atmospheric pressure to form a pressure difference, the pressure difference forces the external ambient air to flow into the sample bag 31 inside the gas sampling bottle 2, the pointer 271 of the gas pressure monitor 27 is observed, when the pointer 271 of the gas pressure monitor rotates to the 0 position, the internal and external gas pressures of the gas sampling device reach an equilibrium state, the valve of the second gas flow controller 26 is closed, and the sample collection stage is completed.
Claims (10)
1. The portable gas collecting device comprises a gas collecting bottle and a sample container, and is characterized in that the gas collecting bottle comprises a bottle body (21), a bottle cap (22), a first gas flow controller (25) and a second gas flow controller (26) which are connected with each other;
the bottle body (21) is connected with the bottle cap (22);
the sample container (3) comprises a sample bag (31), a straight-through joint (32) and a nut (33);
a nut (33) is arranged in the sample bag (31), a sample bag through hole is formed in the upper side of the sample bag (31), and the lower part of the straight-through joint (32) is in threaded connection with the nut (33) in the sample bag (31) through the sample bag through hole; the upper part of the straight-through joint (32) is in threaded connection with the bottle cap (22);
the first airflow controller (25) is arranged on the bottle body (21), and the second airflow controller (26) is arranged on the bottle cap (22); the second air flow controller interface (221) is communicated with the inside of the straight-through joint (32);
the first air flow controller (25) and the second air flow controller (26) are respectively provided with an air inlet and are used for being connected with an air extraction opening of the external vacuum generating device (4); the first airflow controller (25) is used for controlling the communication and disconnection between the interior of the bottle body and the outside environment air; the second air flow controller (26) is used for controlling the communication and cut-off between the inside of the sample container and the outside environment air;
each connecting part is in sealing connection.
2. The portable gas production device of claim 1, wherein the sampling bottle further comprises a gas pressure monitor (27) disposed on the bottle body.
3. The portable gas production device according to claim 1, characterized in that the sampling bottle is further provided with a pressure lock (23), and the bottle cap (22) is fixedly connected with the bottle body (21) through the pressure lock (23).
4. A portable gas production device according to claim 3, wherein the body (21) comprises a cap interface (211) with a top surface provided with a top surface flange (2111), and a bottom surface flange (222) is provided along the lower edge of the cap (22); the inner wall of the pressure lock (23) is matched with the top surface flange (2111) of the bottle cap interface and the bottom surface flange (222) of the bottle cap.
5. The portable gas production device according to claim 1, characterized in that the top flange (2111) of the cap interface is provided with a sealing ring mounting groove (2112) for fixing a first O-ring (24), and the body (21) and the cap (22) are sealingly connected by the first O-ring (24).
6. The portable gas production device of claim 1, wherein the first gas flow controller (25) and the second gas flow controller (26) are stainless steel ball valves.
7. The portable gas production device according to claim 1, characterized in that the sample container further comprises a second O-ring (34) arranged inside the sample bag (31) and a third O-ring (35) arranged outside the sample bag (31), wherein the sample bag through-opening is pressed by the nut (33) and the through-connection (32) for ensuring the overall air tightness of the sample container (3).
8. Portable gas production device according to claim 1, characterized in that the gas pressure monitor (27) is in particular a pressure gauge.
9. The portable gas production device according to claim 1, characterized in that the bottle body (21) is a stainless steel tank; the bottle cap (22) is made of stainless steel metal.
10. The portable gas production device according to claim 1, characterized in that the sample bag (31) is a sample bag of polytetrafluoroethylene material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223036148.XU CN219302059U (en) | 2022-11-09 | 2022-11-09 | Portable gas production device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223036148.XU CN219302059U (en) | 2022-11-09 | 2022-11-09 | Portable gas production device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219302059U true CN219302059U (en) | 2023-07-04 |
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ID=86958629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223036148.XU Active CN219302059U (en) | 2022-11-09 | 2022-11-09 | Portable gas production device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219302059U (en) |
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2022
- 2022-11-09 CN CN202223036148.XU patent/CN219302059U/en active Active
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