CN115711364B - Structure capable of rapidly detecting leakage of hydrogen-doped natural gas - Google Patents
Structure capable of rapidly detecting leakage of hydrogen-doped natural gas Download PDFInfo
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- CN115711364B CN115711364B CN202211367225.1A CN202211367225A CN115711364B CN 115711364 B CN115711364 B CN 115711364B CN 202211367225 A CN202211367225 A CN 202211367225A CN 115711364 B CN115711364 B CN 115711364B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 239000003345 natural gas Substances 0.000 title claims abstract description 57
- 239000007789 gas Substances 0.000 claims abstract description 170
- 238000001514 detection method Methods 0.000 claims abstract description 91
- 238000009792 diffusion process Methods 0.000 claims abstract description 45
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000001257 hydrogen Substances 0.000 claims abstract description 30
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims description 17
- 239000011261 inert gas Substances 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 10
- 238000004880 explosion Methods 0.000 abstract description 7
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 19
- 230000005484 gravity Effects 0.000 description 10
- 230000009471 action Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 239000012530 fluid Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 230000013011 mating Effects 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 229910052704 radon Inorganic materials 0.000 description 1
- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical compound [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to the technical field of gas detection, in particular to a structure capable of rapidly detecting leakage of hydrogen-doped natural gas, which is assembled at a flange part connected between pipelines, and comprises a diffusion module assembled at the flange part and used for collecting and pressurizing the leakage gas, and a detection module which is covered outside the diffusion module and used for detecting the leakage gas, wherein the diffusion module is provided with an exhaust port, and further comprises a valve control module assembled at the exhaust port; the invention can detect the hydrogen-doped natural gas under the condition of less leakage amount, so that the leakage condition of the hydrogen-doped natural gas can be detected more quickly, the risk of inflammability caused by excessive hydrogen leakage is avoided, serious consequences such as fire, explosion and environmental pollution are avoided, and the technical problem that the leakage of the hydrogen-doped natural gas cannot be detected in time in the prior art is effectively solved.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a structure capable of rapidly detecting leakage of hydrogen-doped natural gas.
Background
Hydrogen energy is a clean energy source, which is helpful for reducing carbon emission; hydrogen is widely existing in nature and has large energy reserves. At present, the problem of hydrogen transportation needs to be solved, and the construction cost and the progress of a pure hydrogen pipeline are high, so that the hydrogen loading transportation by utilizing the existing natural gas pipeline is one of low-cost, large-scale and high-efficiency methods.
The prior art provides a natural gas pipeline structure with reveal automated inspection function, including natural gas pipeline body, detection mechanism, backup pad one, backup pad two, unable adjustment base, buffer gear and detection case main part, detection mechanism includes gas sensor, through the cooperation effect between gas sensor, alarm lamp, the transparent guard plate and the total treater that set up, can carry out fine natural gas leakage detection to the natural gas pipeline body of detection case main part internally mounted.
However, the detection principle of the prior art for gas leakage is to convert the pressure change generated by the gas leakage into an electric signal to be transmitted to the gas pressure sensor, and the electric signal can be detected after the gas naturally leaks for a certain time and reaches a certain concentration. Because the volumetric heat value of hydrogen is lower than that of natural gas, the Wobbe number of the mixture of the natural gas after the natural gas is doped is obviously reduced, and the Wobbe number is continuously reduced along with the increase of the hydrogen doping proportion. The relevant scholars indicate that in a mixture of 15% H2 and 85% natural gas, the flow rate of the mixture must be increased by a factor of 1.7 to maintain the same energy supply, and therefore, the hydrogen loaded natural gas mixture requires a greater volumetric flow and is more prone to pipeline gas leakage problems. Meanwhile, as the hydrogen ignition energy is small, the ignition concentration is wide, the hydrogen ignition is extremely easy to ignite, once leakage is small, the production operation is influenced, serious accidents such as fire and explosion occur, and casualties are caused, and the leakage detection requirement on the hydrogen-doped natural gas is more strict, so that the technical problem that the leakage of the hydrogen-doped natural gas cannot be detected in time exists in the prior art.
Disclosure of Invention
The invention aims to overcome the defect that leakage of hydrogen-doped natural gas cannot be detected in time in the prior art, and provides a structure capable of rapidly detecting leakage of hydrogen-doped natural gas.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a can quick detection hydrogen natural gas leakage's structure, assemble in the flange department of connecting between the pipeline, including assemble in flange department and be used for collecting the diffusion module of leaking gas and pressurizing it and cover locate the diffusion module is outside sealed and be used for detecting the detection module of leaking gas, the diffusion module is equipped with the gas vent, still include assemble in the valve control module of gas vent, when the valve control module is closed, the diffusion module forms sealedly and the diffusion module can be to leaking gas pressurization in flange department; when the valve control module is opened, the diffusion module is communicated with the detection module through the exhaust port.
According to the structure capable of rapidly detecting leakage of hydrogen-doped natural gas, disclosed by the invention, the structure is assembled at the flange connected between pipelines, wherein the diffusion module is assembled at the flange to be matched with the valve control module to collect leakage gas and boost the leakage gas, when the valve control module closes the exhaust port, the diffusion module forms a seal at the flange to collect the leakage gas and boost the leakage gas, the valve control module is opened after the pressurization is completed, the sealed detection module is covered outside the diffusion module and is communicated with the diffusion module through the exhaust port, the pressurized gas enters the detection module through the exhaust port by the diffusion module, the pressure of the pressurized gas is increased, the concentration of the pressurized gas is increased, and the detection module senses the gas at the moment when the gas is exhausted from the exhaust port, so that relevant staff can know leakage information and maintain the leakage information more rapidly; compared with the method for detecting natural leaked gas, the method for detecting the hydrogen-doped natural gas by using the diffusion module to boost the leaked gas and discharge the leaked gas to the detection module, the method can detect the hydrogen-doped natural gas under the condition of less gas leakage, so that the leakage condition of the hydrogen-doped natural gas can be detected more quickly, the risk of inflammability caused by excessive hydrogen leakage is avoided, serious consequences such as fire, explosion and environmental pollution are avoided, and the technical problem that the leakage of the hydrogen-doped natural gas cannot be detected in time in the prior art is effectively solved.
Further, the diffusion module comprises a shell covered outside the flange, and a closed impeller which is arranged in the shell and coaxially and rotatably assembled on the outer ring of the flange, wherein the closed impeller comprises turntables coaxially and rotatably arranged on two sides of the flange and curved blades arranged between the turntables, the curved blades are in a curved corrugated surface, and the curved blades are radially arranged along the flange and uniformly encircle the outer ring of the flange; the exhaust port is arranged on the shell, and when the valve control module is closed, the shell forms a seal at the flange; when the valve control module is opened, the shell is communicated with the detection module through the exhaust port. The exhaust port is arranged on the shell covered outside the flange, and the valve control module matched with the exhaust port forms a seal at the flange, so that a place and conditions for pressurizing gas are provided for the diffusion module, the bent blades are radially arranged along the flange and encircle the outer ring of the flange, the leaked gas firstly enters a channel between the bent blades, the shape of the bent blades is a bent corrugated curved surface, the leaked gas can generate acting force on the corrugated curved surface of the bent blades to enable the bent blades to rotate, the axial sectional area of the channel between the bent blades is continuously enlarged, the pressure is continuously increased along with the diffusion process of the gas channel according to the Bernoulli principle, and meanwhile, the gas is continuously accumulated between the outer ring of the closed impeller and the inner wall of the shell along with the continuous rotation of the leaked closed impeller, so that the pressurizing effect of the gas is continuously achieved; after the pressurization of the gas is completed, the valve control module is opened, and the gas can enter the detection module through the exhaust port; the diffusion module disclosed by the invention automatically pressurizes leaked natural gas by utilizing the self structure of the closed impeller, and can realize the pressurization of gas without the input of an external driving source, so that the gas which cannot reach the detection concentration originally reaches the concentration which can be detected after being pressurized, and the diffusion module has the advantages of low use cost and good effect.
Further, the shell is in a spiral case shape and is coaxially arranged with the closed impeller, the spiral direction of the spiral case is the same as the rotation direction of the closed impeller, and the exhaust port is arranged at the maximum section of the spiral case. The volute is characterized in that the cross-sectional area of an internal channel of the volute is continuously enlarged from inside to outside, the shell is in a volute shape and is coaxially arranged with the closed impeller, the spiral direction of the shell is the same as the rotation direction of the closed impeller, gas between the outer edge of the closed impeller and the inner wall of the shell is driven to flow from inside to outside along with the rotation of the closed impeller, the flow space is continuously enlarged from inside to outside along with the spiral, the pressure of the gas is increased along with the increase of the space between the outer ring of the closed impeller and the inner wall of the shell according to Bernoulli principle, and when the gas reaches an exhaust port arranged at the maximum section of the volute, the pressure is increased to a peak value, so that the exhaust port is arranged at the maximum section of the volute, and the optimal supercharging effect is achieved.
Further, the valve control module comprises a gear, an external tooth matching part, an internal tooth matching part, an exhaust plate and a connecting rod, wherein the gear is rotationally connected in the shell, the external tooth matching part and the internal tooth matching part are arranged on the turntable and can be respectively and independently meshed with the gear, the exhaust plate is rotationally arranged at the exhaust port, the outer contour of the exhaust plate can be attached to the inner wall of the exhaust port, and the connecting rod is arranged between the gear and the exhaust plate; the gear shaft center is connected with a rocker, the rocker is provided with a first chute, and one end of the connecting rod rotates and is connected with the first chute in a sliding way; the exhaust plate is provided with a second chute, and the other end of the connecting rod is rotationally and slidingly connected with the second chute; the external tooth matching part can enable the exhaust plate to be opened and kept in an opened state when being meshed with the gear, and the internal tooth matching part can enable the exhaust plate to be closed and kept in a closed state when being meshed with the gear. The rocker connected to the axle center of the gear can shake along with the gear in the same direction, because the gear rotates and is arranged in the shell, the external tooth matching part and the internal tooth matching part which are arranged on the rotary table are meshed with the gear to enable the rotary table to rotate, because the external tooth matching part is meshed with the gear to enable the exhaust plate to be opened, the external tooth matching part is arranged on one side of the gear which is far away from the circle center of the rotary table, when the external tooth matching part is meshed with the gear, the gear and the rotary table can rotate in the same direction, so that the rocker swings upwards, because one end of the connecting rod rotates and is connected with the first sliding groove of the rocker in a sliding way, the other end rotates and is connected with the second sliding groove of the exhaust plate in a sliding way, the exhaust plate rotates and is arranged at the exhaust port, the rocker swings upwards to enable the connecting rod to rotate and slide relatively to the first sliding groove and the second sliding groove, finally the connecting rod props upwards, so that the exhaust plate with the outer contour is opened, after the exhaust plate is opened, gas in the shell instantaneously enters the detection module through the shell, and the exhaust plate is automatically and slowly rotated downwards to the outer contour of the exhaust plate is attached to the inner wall due to the fact that the downward resultant force of the exhaust plate is received by the self and the connecting rod; however, in order to realize gradual periodic exhaust, an internal tooth meshing part capable of forcibly closing the exhaust plate is additionally arranged, and the internal tooth matching part is arranged on one side of the gear close to the circle center of the turntable, so that when the internal tooth matching part is meshed with the gear, the gear and the turntable can rotate reversely, the rocker swings downwards, the connecting rod rotates and slides relatively to the first chute and the second chute, and finally the connecting rod pulls downwards to close the exhaust plate; because the external tooth matching part and the internal tooth matching part are respectively and independently meshed with the gears, the condition of simultaneous meshing does not exist, the rotating disc can rotate for one circle, and the exhaust plate can be automatically opened and closed once; when the closed impeller starts to rotate, the gas is pressurized in the closing process of the exhaust plate, and the gas is discharged in the opening process of the exhaust plate; the effect that the exhaust plate automatically opens and closes the exhaust port is generated along with unidirectional rotation of the turntable by utilizing the inner tooth matching part and the outer tooth matching part is realized, so that the pressurizing and releasing processes of gas can be periodically and stably carried out, and the leaked gas is intermittently and gradually exhausted to avoid continuous accumulation.
Further, the internal tooth mating portions and the external tooth mating portions are provided on both sides of the turntable radially opposite to each other. The internal tooth matching parts and the external tooth matching parts are arranged on two sides of the rotating disc, which are radially opposite, so that the time from closing to opening of the exhaust plate is identical to the time from opening to closing, and insufficient or excessive pressurization of gas caused by uncoordinated pressurization and release time is avoided.
Further, the internal tooth matching part, the external tooth matching part, the connecting rod, the gear and the rocker connected with the gear are symmetrically arranged on the two sides of the turntable respectively. The internal tooth matching part, the external tooth matching part, the connecting rod, the gear and the rocker connected with the gear are symmetrically arranged on the turntables at two sides respectively, so that the stress of the exhaust plate is more uniform, and the exhaust plate is suitable for the working condition of continuous use at high frequency.
Further, the detection module comprises a detection box body and a gas sensor, wherein the detection box body is used for being covered outside the shell to form a seal, and the gas sensor is arranged in the detection box body; when the valve control module is opened, the shell is communicated with the detection box body through the exhaust port. The shell is covered by the detection box body to form sealing, the influence on the detection effect of the gas sensor on the gas caused by the leakage of the gas released by the gas outlet to the outside is avoided, and when the valve control module is opened, the shell is communicated with the detection box body through the gas outlet.
Further, a pressure sensor and a control system are arranged in the detection box body, the detection box body is connected with a gas supply module, the gas sensor and the pressure sensor are in signal connection with the control system, and the gas supply module can supply inert gas into the detection box body so as to keep the pressure in the detection box body larger than the pressure in the shell. The control system is used for receiving the electric signal of the pressure sensor and controlling the gas supply module, when gas leakage occurs, the pressure of the gas after being pressurized by the diffusion module is larger than the pressure in the detection box body, once the gas discharge plate is opened and the gas is released, the pressure in the shell is balanced with the pressure in the detection box body instantly, the gas sensor detects the gas, the pressure sensor senses the pressure in the detection box body to reduce and then sends the electric signal to the control system, the control system receives the electric signal and controls the gas supply module to operate, the gas supply module charges inert gas into the detection box body, the inert gas is difficult to perform chemical reaction, and the inert gas is filled into the detection box body and can coexist with the gas well, so that the risk of ignition explosion of the gas can be avoided; when the pressure sensor detects that the pressure value in the detection box body is restored to the level before balance, an electric signal is sent to the control system to control the gas supply module to stop running, the pressure in the detection box body is kept to be greater than the pressure in the shell, the pressure is enabled to act on the surface of the exhaust plate, the exhaust plate is easier to push the connecting rod downwards, the stable normally closed state of the exhaust plate is kept, and the situation that the external tooth matching part and the gear are meshed for the last time, and after the exhaust plate is meshed and opened, the internal tooth matching part is not automatically closed with the gear to be too slow to cause the deterioration of the pressurizing effect on gas is avoided.
Further, the exhaust plate comprises a first panel, a second panel and an inclined plate, wherein the second panel is arranged parallel to the first panel, the inclined plate is arranged between the first panel and the second panel, the inclined plate is rotationally connected to the shell, the first panel is higher than the second panel when the exhaust plate is closed, and the second chute is arranged on the first panel. The exhaust plate is composed of a first panel, a second panel and an inclined plate, so that the contact area between the exhaust plate and inert gas in the detection box body can be increased, and the normally closed state of the exhaust plate under the condition that the pressure difference exists between the inside and the outside of the exhaust plate is ensured; the second panel and the first panel are arranged in parallel, so that the middle inclined plate is rotationally connected with the shell, and the whole rotation state is easier to control and balance; when the exhaust plate is closed, the first panel is higher than the second panel, so that gravity action of the connecting rod on the first panel is realized, the gravity center of the first panel is larger than that of the second panel, and the force of the pressure difference acting on the first panel is more remarkable, so that the normally closed effect of the exhaust plate is enhanced.
Further, the area of the active surface of the first panel is larger than the area of the active surface of the second panel. The area of the acting surface of the first panel is larger than that of the acting surface of the second panel, the contact area of the first panel and inert gas is increased, the force of the internal and external pressure difference acting on the first panel is more remarkable, and the normally closed effect of the exhaust plate is enhanced.
Compared with the prior art, the invention has the beneficial effects that:
compared with the detection of natural leakage gas, the invention can detect the natural gas with less leakage amount of the natural gas, so that the leakage condition of the natural gas with hydrogen can be detected more quickly, the risk of inflammability caused by excessive leakage of the hydrogen is avoided, serious consequences such as fire, explosion and environmental pollution are avoided, and the technical problem that the leakage of the natural gas with hydrogen cannot be detected in time in the prior art is effectively solved.
The diffusion module disclosed by the invention automatically pressurizes leaked natural gas by utilizing the self structure of the closed impeller, and can realize the pressurization of gas without the input of an external driving source, so that the gas which cannot reach the detection concentration originally reaches the concentration which can be detected after being pressurized, and the diffusion module has the advantages of low use cost and good effect.
The valve control module utilizes the effect that the inner tooth matching part and the outer tooth matching part automatically open and close the exhaust port along with the unidirectional rotation of the turntable, so that the pressurizing and releasing processes of gas can be periodically and stably carried out, and the leaked gas is intermittently and gradually exhausted to avoid continuous accumulation, and the valve control module has the advantages of simple structure, practicability and high efficiency.
Drawings
FIG. 1 is a schematic diagram of a structure that can rapidly detect hydrogen-loaded natural gas leaks;
FIG. 2 is a top view of a structure that can quickly detect hydrogen-loaded natural gas leaks;
FIG. 3 is a cross-sectional view taken along the direction A-A in FIG. 2;
FIG. 4 is a cross-sectional view taken along the direction B-B in FIG. 2;
FIG. 5 is a schematic diagram of a structure for rapidly detecting leakage of hydrogen-loaded natural gas according to the first embodiment;
FIG. 6 is a schematic diagram of a structure for rapidly detecting leakage of hydrogen-loaded natural gas according to the second embodiment;
FIG. 7 is a schematic diagram of a valve control module;
FIG. 8 is a schematic diagram of a third embodiment of a structure for rapidly detecting leakage of hydrogen-loaded natural gas;
FIG. 9 is a schematic diagram of a force analysis with the exhaust plate closed;
FIG. 10 is a schematic diagram illustrating a force analysis when the vent plate is opened;
FIG. 11 is a schematic flow chart of intelligent gas distribution.
In the accompanying drawings: 10. a pipe; 20. a flange; 100. a diffusion module; 110. a housing; 120. a closed impeller; 121. a turntable; 122. bending the blade; 130. an exhaust port; 200. a detection module; 210. a detection box body; 300. a valve control module; 310. a gear; 320. an external tooth mating portion; 330. an internal tooth mating portion; 340. an exhaust plate; 341. a second chute; 342. a first panel; 343. a second panel; 344. a sloping plate; 350. a connecting rod; 360. a rocker; 361. and a first chute.
Detailed Description
The invention is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
Example 1
Fig. 3 and 5 show a first embodiment of a structure for rapidly detecting leakage of hydrogen-loaded natural gas according to the present invention.
The utility model provides a structure that can detect fast and add hydrogen natural gas and reveal, assemble in the flange 20 department that connects between the pipeline 10, including assemble in flange 20 department and be used for collecting and reveal the gas and boost pressure of gas and cover locate the detection module 200 that the diffusion module 100 is sealed and is used for detecting and reveal the gas, the diffusion module 100 has the gas vent 130, still include the valve control module 300 assembled in the gas vent 130, when the valve control module 300 is closed, the diffusion module 100 forms the seal in flange 20 department and the diffusion module 100 can boost the gas of revealing; when the valve control module 300 is opened, the diffuser module 100 and the detection module 200 communicate through the exhaust port 130. The diffusion module 100 is assembled at the flange 20 and matched with the valve control module 300 to collect leakage gas and boost the pressure, when the valve control module 300 closes the exhaust port 130, the diffusion module 100 forms a seal at the flange 20 to collect the leakage gas and boost the pressure, after the pressurization is completed, the valve control module 300 is opened, the detection module 200 covered outside the diffusion module 100 is communicated with the diffusion module 100 through the exhaust port 130, the pressurized gas enters the detection module 200 through the exhaust port 130 from the diffusion module 100, the pressurized gas is pressurized, the concentration is increased, the detection module 200 senses the gas at the moment when the gas is exhausted from the exhaust port, so that relevant staff can learn the leakage information more quickly and maintain the leakage information; compared with the method for detecting natural leaked gas, the method for detecting the hydrogen-doped natural gas by using the diffusion module 100 to boost the pressure of the leaked gas and discharge the leaked gas to the detection module 200, the method can detect the hydrogen-doped natural gas under the condition of less leakage, so that the leakage condition of the hydrogen-doped natural gas can be detected more quickly, the risk of inflammability caused by excessive hydrogen leakage is avoided, serious consequences such as fire, explosion and environmental pollution are avoided, and the technical problem that the leakage of the hydrogen-doped natural gas cannot be detected in time in the prior art is effectively solved.
As shown in fig. 3, the diffusion module 100 includes a housing 110 covering the flange 20, a closed impeller 120 disposed in the housing 110 and coaxially rotatably assembled on an outer ring of the flange 20, the closed impeller 120 includes a turntable 121 coaxially rotatably disposed on two sides of the flange 20, and curved blades 122 disposed between the turntable 121, the curved blades 122 are shaped as curved corrugated surfaces, the curved blades 122 are radially disposed along the flange 20, and a plurality of groups of curved blades 122 uniformly surround the outer ring of the flange 20; the exhaust port 130 is provided in the housing 110, and when the valve control module 300 is closed, the housing 110 forms a seal at the flange 20; when the valve control module 300 is opened, the housing 110 and the detection module 200 communicate through the exhaust port 130. The exhaust port 130 is arranged on the shell 110 covered outside the flange 20, and the valve control module 300 matched with the exhaust port 130 forms a seal at the flange 20, so that a place and conditions for providing pressurized gas for the diffusion module 100 are provided, because the bent blades 122 are radially arranged along the flange 20 and encircle the outer ring of the flange 20, leaked gas firstly enters a channel between the bent blades 122, the shape of the bent blades 122 is a bent corrugated curved surface, the leaked gas can generate acting force on the corrugated curved surface of the bent blades 122 to rotate, and the pressure is continuously increased along with the continuous expansion of the axial sectional area of the channel between the bent blades 122 in the process of diffusing the gas channel according to the Bernoulli principle, and meanwhile, the gas is continuously accumulated between the outer ring of the closed impeller 120 and the inner wall of the shell 110 along with the continuous rotation of the leaked closed impeller 120, so that the pressurizing effect is continuously realized, and the pressurizing of the gas is realized; after the pressurization of the gas is completed, the valve control module 300 is opened, and the gas can enter the detection module 200 through the exhaust port 130; the diffusion module 100 of the invention automatically pressurizes leaked natural gas by utilizing the self structure of the closed impeller 120, can realize the pressurization of gas without external driving source input, and ensures that the gas which cannot reach the detection concentration originally reaches the concentration which can be detected after being pressurized, and has the advantages of low use cost and good effect.
In addition, in the present embodiment, the leakage gas flow rate formula is: q=v×a, where: q is the volume flow of the leaked gas, v is the flow velocity of the fluid at the point, and A is the sectional area of the blade channel; the bernoulli equation formula is: p+1/2ρvρ2+ρ g h =c, whereas for gases gravity can be ignored, simplifying the expression to: p+1/2ρvρ2=c, where: p is the pressure at a point in the fluid, v is the flow rate at the point in the fluid, ρ is the fluid density, g is the gravitational acceleration, h is the height at the point, C is a constant, when gas leaks, the leaked gas enters the channel between the curved blades 122, the flow rate v of the fluid is reduced from the leaked gas flow formula due to the gradual expansion of the channel sectional area a of the curved blades 122, and the pressure P of the fluid is increased from the bernoulli equation formula when the flow rate v of the fluid is reduced.
As shown in fig. 5, the casing 110 is in a spiral casing shape and is coaxially arranged with the closed impeller 120, the spiral casing has the same spiral direction as the rotation direction of the closed impeller 120, and the air outlet 130 is arranged at the maximum section of the spiral casing. The volute is characterized in that the cross-sectional area of an internal channel of the volute is continuously enlarged from inside to outside, the shape of the housing 110 is the volute and is coaxially arranged with the closed impeller 120, the spiral direction of the housing is the same as the rotation direction of the closed impeller 120, gas between the outer edge of the closed impeller 120 and the inner wall of the housing 110 is driven to flow from inside to outside along with the rotation of the closed impeller 120, the flow space is continuously enlarged from inside to outside along with the spiral, the pressure of the gas is increased along with the increase of the space between the outer ring of the closed impeller 120 and the inner wall of the housing 110 according to the Bernoulli principle, and when the gas reaches the gas outlet 130 arranged at the maximum section of the volute, the pressure is increased to a peak value, so that the gas outlet 130 is arranged at the maximum section of the volute, and the optimal pressurizing effect is achieved.
Example two
Fig. 4, 6, 7, 9 and 10 show a second embodiment of a structure for rapidly detecting leakage of hydrogen-loaded natural gas according to the present invention.
This embodiment is similar to the embodiment in that: the valve control module 300 includes a gear 310 rotatably connected to the inside of the housing 110, an external gear engagement part 320 and an internal gear engagement part 330 provided to the rotary table 121 and individually engaged with the gear 310, an exhaust plate 340 rotatably provided to the exhaust port 130 and having an outer contour attachable to an inner wall of the exhaust port 130, and a link 350 provided between the gear 310 and the exhaust plate 340; the axle center of the gear 310 is connected with a rocker 360, the rocker 360 is provided with a first chute 361, and one end of the connecting rod 350 rotates and is connected with the first chute 361 in a sliding way; the exhaust plate 340 is provided with a second chute 341, and the other end of the connecting rod 350 is rotatably and slidably connected to the second chute 341; the outer engagement portion 320 is engaged with the gear 310 to open and maintain the exhaust plate 340 in an open state, and the inner engagement portion 330 is engaged with the gear 310 to close and maintain the exhaust plate 340 in a closed state. Due to the fixed position of the curved blades 122 of the shrouded impeller 120, once the flange 20 leaks gas, the force of the gas against the surfaces of the curved blades 122 will cause the shrouded impeller 120 to rotate clockwise in the direction of fig. 4.
In this embodiment, as shown in fig. 4 and 7, the rocker 360 connected to the axle center of the gear 310 can shake along with the gear 310 in the same direction, because the gear 310 rotates in the housing 110, the external tooth matching portion 320 and the internal tooth matching portion 330 which are required to be arranged in the turntable 121 are meshed with each other to rotate the same, because the external tooth matching portion 320 can open the exhaust plate 340 when meshed with the gear 310, the external tooth matching portion 320 is arranged at one side of the gear 310 far away from the center of the turntable 121, when the external tooth matching portion 320 is meshed with the gear 310, the gear 310 and the turntable 121 can rotate in the same direction, so that the rocker 360 swings upwards, because one end of the connecting rod 350 rotates and is slidingly connected with the first runner 361 of the rocker 360, the other end rotates and is slidingly connected with the second runner 341 of the exhaust plate 340, and the exhaust plate 340 rotates in the exhaust port 130, the rocker 360 swings upwards to enable the connecting rod 350 to rotate relatively to slide relatively to the first runner 361 and the second runner, and finally the connecting rod 350 lifts upwards, so that the exhaust plate 340 attached to the inner wall of the exhaust port 130 is opened, and after the external profile of the exhaust plate 340 is opened, gas in the housing 110 automatically enters the detection module 200 in the same direction through the housing 110, and the exhaust plate 340 is automatically attached to the inner wall of the housing 110, and the exhaust plate is attached to the outer profile of the exhaust plate 110 by itself, and the outer wall of the housing is relatively and the outer wall of the housing 110; however, in order to realize gradual periodic exhaust, an internal tooth engagement portion capable of forcibly closing the exhaust plate 340 is added, and the internal tooth engagement portion 330 is disposed on one side of the gear 310 close to the center of the turntable 121, so that when the internal tooth engagement portion 330 is engaged with the gear 310, the gear 310 and the turntable 121 can be rotated in opposite directions, the rocker 360 swings downward to enable the connecting rod 350 to rotate and slide relatively to the first chute 361 and the second chute 341, and finally the connecting rod 350 pulls downward to close the exhaust plate 340; because the external tooth matching part 320 and the internal tooth matching part 330 are respectively and independently meshed with the gear 310, the condition of simultaneous meshing does not exist, the rotation of the rotary table 121 for one circle is realized, and the exhaust plate 340 is automatically opened and closed once; when the closed impeller 120 starts to rotate, the gas is pressurized in the process of closing the exhaust plate 340, and the gas is discharged in the process of opening the exhaust plate 340; the effect of automatically opening and closing the exhaust port 130 by the exhaust plate 340 along with the unidirectional rotation of the turntable 121 by utilizing the inner tooth matching part 330 and the outer tooth matching part 320 is realized, so that the pressurizing and releasing process of gas can be periodically and stably carried out, and the leaked gas is intermittently and gradually exhausted to avoid continuous accumulation.
In addition, in the present embodiment, as shown in fig. 9, when the exhaust plate 340 is in the closed state, the connecting rod 350 is at the initial position in the second chute 341, and the initial position is close to the rotation axis of the exhaust plate 340 relative to the housing 110, so that the center of gravity is close to the rotation axis, and at this time, the exhaust plate 340 is kept in the downward closed state by the gravity of the exhaust plate 340 and the resultant force of the connecting rod 350 to the exhaust plate 340; as shown in fig. 10, after the external tooth engagement portion is engaged with the gear 310, the rocker 360 swings clockwise along with the clockwise rotation of the gear 310, one end of the connecting rod 350 slides in the first chute 361 and is ejected upwards under the swinging action of the rocker 360, and the other end of the exhaust plate 340 slides in the second chute 341 due to the upward ejection action of the connecting rod 350, the connecting rod 350 slides in the second chute 341 from the initial position to the limit position, after reaching the limit position, the exhaust plate 340 is fully opened, at the moment of opening, the exhaust plate 340 receives the resultant force of the upward leakage gas impulse force, the gravity of the exhaust valve itself and the resultant force of the downward action of the connecting rod 350 on the exhaust plate 340, at this moment, the resultant force action point of the connecting rod 350 on the exhaust plate 340 is far away from the rotation axis of the exhaust plate 340, the gravity falls on the side of the exhaust plate 340 near the limit position of the connecting rod 350 in the second chute 341, and after the gas release, the exhaust plate 340 receives only the resultant force of the gravity of the self and the downward action of the connecting rod 350 on the exhaust plate 340, so that the exhaust plate 340 rotates slowly to the outer contour and the inner wall of the exhaust port 130 automatically.
As shown in fig. 4, the internal tooth engaging portions 330 and the external tooth engaging portions 320 are provided on diametrically opposite sides of the turntable 121. The inner tooth matching parts 330 and the outer tooth matching parts 320 are arranged on two diametrically opposite sides of the rotary table 121, so that the time from closing to opening of the exhaust plate 340 is the same as the time from opening to closing, and insufficient or excessive pressurization of gas caused by uncoordinated pressurization and release time is avoided.
In addition, in the present embodiment, through the arrangement of the two diametrically opposite sides of the inner tooth meshing portion and the outer tooth meshing portion, the exhaust valve is opened and closed once in the process of rotating the closed impeller 120 once, so as to periodically discharge the leaked gas, so that a periodic pulse signal is generated in the detection module 200, and the detection module 200 can accurately and reliably detect the leaked gas.
As shown in fig. 6, the internal gear engaging portion 330, the external gear engaging portion 320, the connecting rod 350, the gear 310, and the rocker 360 connected to the gear 310 are symmetrically disposed on the turntable 121. The internal tooth matching part 330, the external tooth matching part 320, the connecting rod 350, the gear 310 and the rocker 360 connected with the gear 310 are symmetrically arranged on the rotary tables 121 on two sides respectively, so that the stress of the exhaust plate 340 is more uniform, and the working condition of high-frequency continuous use is adapted.
Example III
Fig. 1, 2, 7 and 8 show a third embodiment of a structure for rapidly detecting leakage of hydrogen-doped gas according to the present invention.
This embodiment is similar to the first or second embodiment, except that: the detection module 200 includes a detection box body 210 for covering the outer casing 110 to form a seal, and a gas sensor disposed in the detection box body 210; when the valve control module 300 is opened, the housing 110 and the detection box body 210 communicate through the exhaust port 130. The detection box body 210 is arranged to cover the outer shell 110 to form a seal, so that the influence on the detection effect of the gas sensor on the gas caused by the leakage of the gas released by the gas outlet 130 to the outside is avoided, and when the valve control module 300 is opened, the outer shell 110 is communicated with the detection box body 210 through the gas outlet 130.
The detection box body 210 is provided with a pressure sensor and a control system, and the detection box body 210 is connected with a gas supply module, and the gas supply module, the gas sensor and the pressure sensor are in signal connection with the control system, and the gas supply module can supply inert gas into the detection box body 210 so as to keep the pressure in the detection box body 210 greater than the pressure in the housing 110. The control system is used for receiving the electric signal of the pressure sensor and controlling the gas supply module, when gas leakage occurs, the diffusion module 100 pressurizes the gas and then discharges the gas into the detection box body 210, the pressurized gas pressure is larger than the pressure in the detection box body 210, once the exhaust plate 340 is opened and the gas is released, the pressure in the shell 110 is instantly balanced with the pressure in the detection box body 210, the gas sensor detects the gas, the pressure sensor senses the pressure in the detection box body 210 to reduce and then sends the electric signal to the control system, the control system receives the electric signal and then controls the gas supply module to operate, the gas supply module charges inert gas into the detection box body 210, the inert gas is difficult to perform chemical reaction, the inert gas is charged into the detection box body 210, the inert gas can well coexist with the gas, and the risk of ignition explosion of the gas can be avoided; when the pressure sensor detects that the pressure value in the detection box body 210 is restored to the level before balance, an electric signal is sent to the control system to control the gas supply module to stop running, so that the gas pressure in the detection box body 210 is kept to be greater than the gas pressure in the shell 110, the pressure acts on the surface of the exhaust plate 340, the exhaust plate 340 is easier to push the connecting rod 350 downwards, the stable normally closed state of the exhaust plate 340 is maintained, and the situation that the supercharging effect on gas is poor due to the fact that the internal tooth matching part 330 is not automatically closed too slowly with the gear 310 after the external tooth matching part 320 is meshed with the gear 310 to open the exhaust plate 340 for the last time is avoided.
In addition, the inert gas comprises seven kinds of gases, namely helium, neon, argon, krypton, xenon, radon and gas o, wherein helium which is the least active in the elements is adopted in the embodiment, and the inert gas is colorless and odorless under the condition of normal temperature and normal pressure, has smaller density than air and has very stable property.
As shown in fig. 8, the exhaust plate 340 includes a first panel 342, a second panel 343 parallel to the first panel 342, and an inclined plate 344 disposed between the first panel 342 and the second panel 343, the inclined plate 344 is rotatably connected to the housing 110, the first panel 342 is higher than the second panel 343 when the exhaust plate 340 is closed, and the second chute 341 is disposed on the first panel 342. The exhaust plate 340 is composed of the first panel 342, the second panel 343 and the inclined plate 344, so that the contact area with the inert gas in the detection box body 210 can be increased, and the normally closed state of the exhaust plate 340 under the condition of pressure difference between the inside and the outside is ensured; the second panel 343 is arranged in parallel with the first panel 342 so that the middle inclined plate 344 is rotatably connected to the housing 110, and the overall rotation state is easier to control balance; when the exhaust plate 340 is closed, the first panel 342 is higher than the second panel 343, so that the gravity action of the connecting rod 350 on the first panel 342 is realized, the gravity center of the first panel 342 is larger than that of the second panel 343, the force of the pressure difference acting on the first panel 342 is more obvious, and the normally closed effect of the exhaust plate 340 is enhanced.
As shown in fig. 8, the area of the active surface of the first panel 342 is larger than the area of the active surface of the second panel 343. The area of the acting surface of the first panel 342 is larger than that of the second panel 343, so that the contact area between the first panel 342 and the inert gas is increased, the force of the internal and external pressure difference acting on the first panel 342 is more remarkable, and the normally closed effect of the exhaust plate 340 is enhanced.
In addition, as shown in fig. 11, because different requirements exist in the user terminal, for example, the gas turbine of the gas power station burns, the gas furnace burns in the home user, the hydrogen-doped natural gas is separated from hydrogen to hydrogen fuel cells, and the hydrogen energy utilization requirements on the hydrogen content and the pressure fluctuation of the gas fuel are higher, in this embodiment, the control system is designed to be a PLC system of the hydrogen gas regulation station, a concentration sensor and a component sensor are additionally arranged in the detection module 200, the composition components of the leaked gas and the concentration of each component are analyzed, the analyzed and read data are uploaded to the PLC system, the gradual exhaust of the detection module 200 and the valve control module 300 are regulated and controlled in linkage with the PLC system of the gas regulation station and the regulation station, the PLC system regulates the natural gas or the hydrogen-doped natural gas output by the terminal through the gas supply source, and the other modules in the regulation station and the downstream modules in the regulation station cooperate with the detection module 200 to regulate and meet the different requirements of the terminal user, so as to realize the accurate regulation and control of each parameter of the gas mixture in the station.
In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (8)
1. Can detect structure that hydrogen natural gas revealed fast, assemble in flange (20) department of connecting between pipeline (10), its characterized in that: the device comprises a diffusion module (100) which is assembled at a flange (20) and is used for collecting leakage gas and pressurizing the leakage gas, a detection module (200) which is covered outside the diffusion module (100) and is used for detecting the leakage gas, wherein the diffusion module (100) is provided with an exhaust port (130), and the device further comprises a valve control module (300) which is assembled at the exhaust port (130), when the valve control module (300) is closed, the diffusion module (100) forms a seal at the flange (20) and the diffusion module (100) can pressurize the leakage gas; when the valve control module (300) is opened, the diffusion module (100) and the detection module (200) are communicated through the exhaust port (130);
the diffusion module (100) comprises a shell (110) covered outside the flange (20), and a closed impeller (120) which is arranged in the shell (110) and coaxially rotates and is assembled on the outer ring of the flange (20), wherein the closed impeller (120) comprises turntables (121) coaxially rotates and is arranged on two sides of the flange (20) and curved blades (122) arranged between the turntables (121), the curved blades (122) are in a curved corrugated curved surface, and the curved blades (122) are radially arranged along the flange (20) and a plurality of groups of curved blades (122) uniformly encircle the outer ring of the flange (20); the exhaust port (130) is arranged on the shell (110), and when the valve control module (300) is closed, the shell (110) forms a seal at the flange (20); when the valve control module (300) is opened, the shell (110) is communicated with the detection module (200) through the exhaust port (130);
the valve control module (300) comprises a gear (310) rotatably connected in the shell (110), an external tooth matching part (320) and an internal tooth matching part (330) which are arranged on the rotary table (121) and can be respectively and independently meshed with the gear (310), an exhaust plate (340) rotatably arranged on the exhaust port (130) and the outer contour of which can be attached to the inner wall of the exhaust port (130), and a connecting rod (350) arranged between the gear (310) and the exhaust plate (340); the axle center of the gear (310) is connected with a rocker (360), the rocker (360) is provided with a first chute (361), and one end of the connecting rod (350) rotates and is connected with the first chute (361) in a sliding way; the exhaust plate (340) is provided with a second chute (341), and the other end of the connecting rod (350) rotates and is connected with the second chute (341) in a sliding way; the external tooth matching part (320) can open the exhaust plate (340) when being meshed with the gear (310), and the internal tooth matching part (330) can close and keep the exhaust plate (340) in a closed state when being meshed with the gear (310); the exhaust plate (340) automatically closes the exhaust port (130) due to the downward resultant force of the exhaust plate and the connecting rod (350) in the process of being opened to closed.
2. The structure for rapidly detecting leakage of hydrogen-doped natural gas according to claim 1, wherein: the shell (110) is in a spiral case shape and is coaxially arranged with the closed impeller (120), the spiral direction of the spiral case is the same as the rotation direction of the closed impeller (120), and the exhaust port (130) is arranged at the maximum section of the spiral case.
3. The structure for rapidly detecting leakage of hydrogen-doped natural gas according to claim 1, wherein: the inner tooth matching part (330) and the outer tooth matching part (320) are arranged on two opposite sides of the turntable (121) in the radial direction.
4. The structure for rapidly detecting leakage of hydrogen-doped natural gas according to claim 1, wherein: the inner tooth matching part (330), the outer tooth matching part (320), the connecting rod (350), the gear (310) and the rocker (360) connected to the gear (310) are symmetrically arranged on the two sides of the turntable (121) respectively.
5. The structure for rapidly detecting leakage of hydrogen-doped natural gas according to claim 1, wherein: the detection module (200) comprises a detection box body (210) which is arranged outside the shell (110) in a covering manner and is sealed, and a gas sensor which is arranged in the detection box body (210), wherein when the valve control module (300) is opened, the shell (110) and the detection box body (210) are communicated through the exhaust port (130).
6. The structure for rapidly detecting leakage of hydrogen-doped natural gas according to claim 5, wherein: the detection box body (210) is internally provided with a pressure sensor and a control system, the detection box body (210) is connected with a gas supply module, the gas sensor and the pressure sensor are in signal connection with the control system, and the gas supply module can supply inert gas into the detection box body (210) so as to keep the pressure in the detection box body (210) to be greater than the pressure in the shell (110).
7. The structure for rapidly detecting leakage of hydrogen-doped natural gas according to claim 6, wherein: the exhaust plate (340) comprises a first panel (342), a second panel (343) which is parallel to the first panel (342) and an inclined plate (344) which is arranged between the first panel (342) and the second panel (343), wherein the inclined plate (344) is rotationally connected to the shell (110), the first panel (342) is higher than the second panel (343) when the exhaust plate (340) is closed, and the second chute (341) is arranged on the first panel (342).
8. The structure for rapidly detecting leakage of hydrogen-doped natural gas according to claim 7, wherein: the area of the active surface of the first panel (342) is larger than the area of the active surface of the second panel (343).
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| CN202211367225.1A CN115711364B (en) | 2022-11-02 | 2022-11-02 | Structure capable of rapidly detecting leakage of hydrogen-doped natural gas |
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| EP0585911A1 (en) * | 1992-09-03 | 1994-03-09 | Matsushita Electric Industrial Co., Ltd. | Two stage primary dry pump |
| WO2005054680A1 (en) * | 2003-12-04 | 2005-06-16 | Beijing Benran S&T Co., Ltd. | Centrifugal pump |
| CN110985889A (en) * | 2019-12-24 | 2020-04-10 | 诸暨向博智能家居科技有限公司 | Intelligent household gas pipeline control system |
| CN213983025U (en) * | 2020-09-22 | 2021-08-17 | 陕西首创天成工程技术有限公司 | Natural gas connection control valve |
| CN217356522U (en) * | 2022-05-16 | 2022-09-02 | 和信海纳川(沧州)汽车部件有限公司 | Gas detection and control device for natural gas pipeline |
| CN218762744U (en) * | 2022-11-02 | 2023-03-28 | 广东工业大学 | Quick detection device that oil gas was revealed |
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2022
- 2022-11-02 CN CN202211367225.1A patent/CN115711364B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0585911A1 (en) * | 1992-09-03 | 1994-03-09 | Matsushita Electric Industrial Co., Ltd. | Two stage primary dry pump |
| WO2005054680A1 (en) * | 2003-12-04 | 2005-06-16 | Beijing Benran S&T Co., Ltd. | Centrifugal pump |
| CN110985889A (en) * | 2019-12-24 | 2020-04-10 | 诸暨向博智能家居科技有限公司 | Intelligent household gas pipeline control system |
| CN213983025U (en) * | 2020-09-22 | 2021-08-17 | 陕西首创天成工程技术有限公司 | Natural gas connection control valve |
| CN217356522U (en) * | 2022-05-16 | 2022-09-02 | 和信海纳川(沧州)汽车部件有限公司 | Gas detection and control device for natural gas pipeline |
| CN218762744U (en) * | 2022-11-02 | 2023-03-28 | 广东工业大学 | Quick detection device that oil gas was revealed |
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| CN115711364A (en) | 2023-02-24 |
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