CN115711364A - 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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- CN115711364A CN115711364A CN202211367225.1A CN202211367225A CN115711364A CN 115711364 A CN115711364 A CN 115711364A CN 202211367225 A CN202211367225 A CN 202211367225A CN 115711364 A CN115711364 A CN 115711364A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 124
- 239000003345 natural gas Substances 0.000 title claims abstract description 62
- 239000007789 gas Substances 0.000 claims abstract description 157
- 238000001514 detection method Methods 0.000 claims abstract description 99
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000001257 hydrogen Substances 0.000 claims abstract description 37
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 37
- 238000009792 diffusion process Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000011261 inert gas Substances 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 6
- 238000012031 short term test Methods 0.000 claims 1
- 238000004880 explosion Methods 0.000 abstract description 6
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 17
- 230000009471 action Effects 0.000 description 11
- 230000005484 gravity Effects 0.000 description 9
- 239000012530 fluid Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000000737 periodic effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000011435 rock Substances 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
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 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
- 238000009825 accumulation Methods 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
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009699 differential effect Effects 0.000 description 1
- 238000007599 discharging Methods 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
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 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
- 238000000926 separation method Methods 0.000 description 1
- 230000009967 tasteless effect Effects 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 connected between pipelines and comprises a diffusion module, a detection module and a valve control module, wherein the diffusion module is assembled at the flange and used for collecting and pressurizing the leakage gas, the detection module is covered outside the diffusion module to form a seal and used for detecting the leakage gas, the diffusion module is provided with an exhaust port, and the valve control module is assembled at the exhaust port; the method can detect the blended natural gas under the condition of less leakage amount, so that the leakage condition of the blended natural gas can be detected more quickly, the risk of flammability caused by excessive hydrogen leakage is avoided, the serious consequences of fire, explosion, environmental pollution and the like are avoided, and the technical problem that the leakage of the blended 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, contributing to reduction of carbon emission; hydrogen is widely existed in nature, and energy reserves are large. At present, the problem of hydrogen transportation needs to be solved, and the construction cost of a pure hydrogen pipeline is high, and the development is slow, so that the hydrogen 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 line structure with reveal automated inspection function, including natural gas line 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 between the gas sensor that sets up, alarm lamp, transparent guard plate and the total treater, can carry out fine natural gas leakage detection to the natural gas line body of detection case main part internally mounted and handle.
However, the detection principle of gas leakage in the prior art is to convert the pressure change generated by gas leakage into an electrical signal and transmit the electrical signal to the gas pressure sensor, and the gas can be detected only after naturally leaking for a certain time and reaching a certain concentration. Because the volume calorific value of the hydrogen is lower than that of the natural gas, the Wobbe number of the mixture of the natural gas after the natural gas is doped with hydrogen is obviously reduced, and the Wobbe number is continuously reduced along with the increase of the hydrogen doping proportion. The relevant scholars have pointed out 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 rate and is more prone to pipeline gas leakage problems. Meanwhile, the hydrogen has small ignition energy and wide ignition concentration, is easy to ignite, influences production operation when the hydrogen leaks, causes serious accidents such as fire, explosion and the like when the hydrogen leaks, causes casualties, and has more strict requirements on leakage detection of the hydrogen-doped natural gas, so 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 the leakage of the hydrogen-doped natural gas cannot be detected in time in the prior art, and provides a structure capable of quickly detecting the leakage of the hydrogen-doped natural gas.
In order to solve the technical problems, the invention adopts the technical scheme that:
the structure capable of rapidly detecting the leakage of the natural gas doped with hydrogen is assembled at a flange connected between pipelines, and comprises a diffusion module which is assembled at the flange and used for collecting the leaked gas and pressurizing the leaked gas, a detection module which is covered outside the diffusion module to form a seal and used for detecting the leaked gas, an exhaust port and a valve control module which is assembled at the exhaust port, wherein when the valve control module is closed, the diffusion module forms a seal at the flange and can pressurize the leaked gas; when the valve control module is opened, the diffusion module is communicated with the detection module through the exhaust port.
The structure capable of rapidly detecting the leakage of the natural gas doped with hydrogen is assembled at a flange connected between pipelines, wherein a diffusion module is assembled at the flange and matched with a valve control module to collect and pressurize the leaked gas, when the valve control module closes an exhaust port, the diffusion module forms a seal at the flange and can collect and pressurize the leaked gas, after pressurization is completed, the valve control module is opened, a detection module which is covered outside the diffusion module and forms a seal is communicated with the diffusion module through the exhaust port, the pressurized gas enters the detection module through the diffusion module through the exhaust port, the pressure of the pressurized gas is increased, the concentration of the pressurized gas is increased, and the detection module can sense the gas at the moment when the gas is exhausted from the exhaust port, so that related workers can know the leakage information and maintain more rapidly; compared with the detection of naturally leaked gas, the detection device can detect the hydrogen-doped natural gas under the condition of less gas leakage amount, so that the leakage condition of the hydrogen-doped natural gas is detected more quickly, the risk of flammability caused by excessive hydrogen leakage is avoided, serious consequences such as fire, explosion, environmental pollution and the like 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.
Furthermore, the diffusion module comprises a shell which covers the flange and a closed impeller which is arranged in the shell and coaxially and rotatably assembled on the outer ring of the flange, the closed impeller comprises rotating discs which are coaxially and rotatably arranged on two sides of the flange and bent blades which are arranged between the rotating discs, the bent blades are in a bent corrugated curved surface, the bent blades are radially arranged along the flange, and a plurality of groups of the bent blades uniformly surround 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 a shell covered outside the flange, a valve control module matched with the exhaust port forms sealing at the flange, and places and conditions for providing pressurized gas for the diffusion module are provided; 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, can realize pressurization of gas without external driving source input, enables the gas which cannot reach the detection concentration originally to reach the concentration which can be detected after pressurization, and has the advantages of low use cost and good effect.
Furthermore, the casing is in a volute shape and is coaxial with the closed impeller, the spiral direction of the volute is the same as the rotating direction of the closed impeller, and the exhaust port is formed in the maximum section of the volute. The volute is characterized in that the section area of an inner channel of the volute is continuously increased from inside to outside, the shell is arranged to be in the shape of the volute and coaxial with the enclosed impeller, the spiral direction of the shell is the same as the rotating direction of the enclosed impeller, gas between the outer edge of the enclosed impeller and the inner wall of the shell is driven to flow from inside to outside along with the rotation of the enclosed impeller, the flowing 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 enclosed impeller and the inner wall of the shell according to the Bernoulli principle, and the pressure is increased to a peak value when the gas reaches an exhaust port arranged at the maximum section of the volute, so that the exhaust port is arranged at the maximum section of the volute, and the optimal pressurization effect is achieved.
Furthermore, the valve control module comprises a gear rotationally connected in the shell, an external tooth matching part and an internal tooth matching part which are arranged on the rotary table and can be separately meshed with the gear, an exhaust plate which is rotationally arranged on the exhaust port and the outer contour of which can be attached to the inner wall of the exhaust port, and a connecting rod arranged between the gear and the exhaust plate; the axle center of the gear is connected with a rocker, the rocker is provided with a first sliding groove, and one end of the connecting rod rotates and is connected with the first sliding groove in a sliding manner; the exhaust plate is provided with a second sliding groove, and the other end of the connecting rod rotates and is connected with the second sliding groove in a sliding manner; the external tooth matching part can enable the exhaust plate to be opened and keep an opened state when being meshed with the gear, and the internal tooth matching part can enable the exhaust plate to be closed and keep a closed state when being meshed with the gear. The rocker connected to the gear axle center can rock along the gear in the same direction, because the gear rotates and is arranged in the shell, the gear can rotate only by being meshed with the external tooth matching part and the internal tooth matching part which are arranged on the turntable, the exhaust plate can be opened when the external tooth matching part is meshed with the gear, the external tooth matching part is arranged on one side of the gear far away from the circle center of the turntable, so when the external tooth matching part is meshed with the gear, the gear and the turntable can rotate in the same direction, the rocker swings upwards, because one end of the connecting rod rotates and is connected with the first sliding chute of the rocker in a sliding manner, the other end rotates and is connected with the second sliding chute of the exhaust plate in a sliding manner, the exhaust plate rotates and is arranged in the exhaust port, the rocker swings upwards, the connecting rod rotates and slides relatively relative to the first sliding chute and the second sliding chute, finally the connecting rod jacks up, the exhaust plate with the outer contour of which is jointed with the inner wall of the exhaust port is opened, after the exhaust plate is opened, the gas in the shell instantly enters the detection module through the shell, and the exhaust plate can automatically and slowly rotate relative to the outer contour of the exhaust port by the shell due to the downward resultant force of the connecting rod due to the self; but in order to realize gradual periodic exhaust, an internal tooth meshing part which can lead the exhaust plate to be closed forcibly is additionally arranged, and the internal tooth matching part is arranged at one side of the gear close to the circle center of the turntable, so when the internal tooth matching part is meshed with the gear, the gear and the turntable can rotate reversely, the rocker swings downwards to lead the connecting rod to rotate and slide relatively relative to the first chute and the second chute, and finally the connecting rod is pulled downwards to lead the exhaust plate to be closed; because the external tooth matching part and the internal tooth matching part are respectively and independently meshed with the gear, the condition of simultaneous meshing does not exist, the purpose that the exhaust plate automatically opens and closes once when the turntable rotates for one circle is realized; after the closed impeller starts to rotate, gas is pressurized in the closing process of the exhaust plate, and gas is discharged in the opening process of the exhaust plate; the realization utilizes internal tooth cooperation portion and external tooth cooperation portion to produce the effect that makes the air discharge plate open automatically and close the gas vent along with the unidirectional rotation of carousel to the pressure boost that makes gas and release process can go on steadily by periodicity, is interrupted progressively to exhaust to leaking gas and avoids continuously gathering, has simple structure, practical efficient advantage.
Further, the internal tooth matching part and the external tooth matching part are arranged on two opposite sides of the rotary table in the radial direction. Set up internal tooth cooperation portion with external tooth cooperation portion locates the carousel is radial relative both sides, realizes that the air discharge plate is the same by closed time to opening with by opening to closed time, avoids the time uncoordinated of pressure boost and release to lead to the insufficient or pressure boost excessive to gaseous pressure boost degree.
Furthermore, the internal tooth matching part, the external tooth matching part, the connecting rod, the gear and the rocker connected to the gear are symmetrically arranged on the two sides of the rotating disc respectively. Set up internal tooth cooperation portion, external tooth cooperation portion, connecting rod, gear and connect in the rocker of gear symmetry respectively set up at both sides carousel, make the air discharge plate atress more even, adapt to the operating mode that high frequency lasts the use.
Furthermore, the detection module comprises a detection box body and a gas sensor, wherein the detection box body is used for covering the outer shell to form sealing, 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. Set up the detection case body cover and establish the shell and form sealedly, avoid revealing by the gas that the gas vent released the external world and lead to influencing gas sensor to gaseous detection effect, when valve control module opened, shell and detection case body pass through the gas vent intercommunication.
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 an electric signal of the pressure sensor and controlling the gas supply module, when gas leakage occurs, the diffusion module pressurizes the gas and discharges the gas into the detection box body, the pressurized gas pressure is larger than the pressure in the detection box body, once the exhaust plate is opened and the gas is released, the pressure in the shell is instantly balanced with the pressure in the detection box body, the gas sensor detects the gas, the pressure sensor senses the reduction of the pressure in the detection box body and sends an electric signal to the control system, the control system controls the gas supply module to operate after receiving the electric signal, the gas supply module fills inert gas into the detection box body, the inert gas hardly performs chemical reaction, the inert gas is filled into the detection box body, the inert gas can well coexist with the gas, and the risk that the gas is ignited and exploded can be avoided; after pressure sensor detects this internal pressure value of detection case and resumes to the level before balanced, send the signal of telecommunication for the gaseous supply module stop operation of control system control, it is greater than the atmospheric pressure in the shell to keep this internal atmospheric pressure of detection case, make pressure action on the air discharge plate surface, it promotes the connecting rod downwards to change to make the air discharge plate, thereby keep the stable normally closed state of air discharge plate, avoid appearing external tooth cooperation portion and gear last time meshing open air discharge plate back internal tooth cooperation portion not too slowly lead to carrying out the circumstances that the pressure boost effect worsened with gear engagement air discharge plate automatic closure.
Further, the air discharge plate comprises a first panel, a second panel arranged in parallel with the first panel, and an inclined plate arranged between the first panel and the second panel, the inclined plate is rotatably connected to the shell, when the air discharge plate is closed, the first panel is higher than the second panel, and the second chute is arranged in the first panel. The exhaust plate is composed of a first panel, a second panel and an inclined plate, so that the contact area of the exhaust plate and the inert gas in the detection box body can be increased, and the normally closed state of the exhaust plate under the condition that pressure difference exists between the inside and the outside is ensured; the second panel is arranged in parallel with the first panel, so that the middle inclined plate is rotatably connected to the shell, and the whole rotating state is easier to control balance; set up when the air discharge plate closes first panel is higher than the second panel, realizes that the connecting rod makes the focus of first panel be greater than the second panel to the action of gravity of first panel, and the power of pressure differential effect at first panel is more showing, strengthens the normally closed effect of air discharge plate.
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 action surface of the first panel is larger than that of the action 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 method for detecting the gas leaked naturally, the method for detecting the leakage of the natural gas of the hydrogen-doped natural gas of the invention can detect the natural gas under the condition of less leakage amount of the natural gas by the aid of the diffusion module, so that the leakage of the natural gas of the hydrogen-doped natural gas can be detected more quickly, the risk of flammability caused by excessive leakage of the hydrogen gas is avoided, serious consequences of fire, explosion, environmental pollution and the like are avoided, and the technical problem that the leakage of the natural gas of the hydrogen-doped natural gas 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, can realize pressurization of gas without external driving source input, enables the gas which cannot reach the detection concentration originally to reach the concentration which can be detected after pressurization, and has the advantages of low use cost and good effect.
The valve control module utilizes the effect that the internal tooth matching part and the external tooth matching part rotate along with the unidirectional rotation of the turntable to automatically open and close the exhaust port of the exhaust plate, so that the pressurizing and releasing process of gas can be periodically and stably carried out, leaked gas is discontinuously 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 configuration for rapid detection of leakage of natural gas from hydrogen-loaded gas;
FIG. 2 is a top view of a configuration for rapid detection of hydrogen-loaded natural gas leaks;
FIG. 3 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;
FIG. 5 is a schematic structural diagram of a system for rapidly detecting a hydrogen-loaded natural gas leak according to the first embodiment;
FIG. 6 is a schematic structural diagram of a second embodiment for rapidly detecting leakage of natural gas loaded with hydrogen;
FIG. 7 is a schematic diagram of a valve control module;
FIG. 8 is a schematic structural diagram of a third embodiment of the present invention for rapidly detecting leakage of natural gas loaded with hydrogen;
FIG. 9 is a schematic view of the force analysis when the vent panel is closed;
FIG. 10 is a schematic view of the force analysis when the vent plate is opened;
fig. 11 is a schematic flow chart of gas intelligent allocation.
In the drawings: 10. a pipeline; 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 fitting portion; 330. an internal-tooth fitting 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. a first chute.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and not for the purpose of limiting the same, the same is shown by way of illustration only and not in the form of limitation; for a better explanation of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood 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 numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation 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 intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Example one
Fig. 3 and 5 show a first embodiment of a structure for rapidly detecting a hydrogen-loaded natural gas leak according to the present invention.
A structure capable of rapidly detecting leakage of hydrogen-doped natural gas is assembled at a flange 20 connected between pipelines 10 and comprises a diffusion module 100 which is assembled at the flange 20 and used for collecting and pressurizing leakage gas, and a detection module 200 which is covered outside the diffusion module 100 to form sealing and used for detecting the leakage gas, wherein the diffusion module 100 is provided with an exhaust port 130, and the structure also 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 sealing at the flange 20 and the diffusion module 100 can pressurize the leakage gas; when the valve control module 300 is opened, the diffuser module 100 and the detection module 200 communicate through the exhaust port 130. The pressure expansion module 100 is assembled at the flange 20 and matched with the valve control module 300 to collect and pressurize the leaked gas, when the valve control module 300 closes the exhaust port 130, the pressure expansion module 100 forms a seal at the flange 20 to collect and pressurize the leaked gas, after pressurization is completed, the valve control module 300 is opened, the detection module 200 which is covered on the pressure expansion module 100 and is sealed is communicated with the pressure expansion module 100 through the exhaust port 130, the pressurized gas enters the detection module 200 through the exhaust port 130 from the pressure expansion module 100, the pressurized gas pressure is increased, the concentration is increased, the detection module 200 can sense the gas at the moment when the gas is exhausted from the exhaust port, and related workers can know the leakage information more quickly and maintain the gas; compared with the detection of naturally leaked gas, the detection method can detect the blended natural gas under the condition of less leakage amount by pressurizing the leaked gas through the diffusion module 100 and discharging the pressurized blended natural gas to the detection module 200, so that the leakage condition of the blended natural gas is detected more quickly, the risk of flammability caused by excessive hydrogen leakage is avoided, serious consequences such as fire, explosion, environmental pollution and the like are avoided, and the technical problem that the leakage of the blended natural gas cannot be detected in time in the prior art is effectively solved.
As shown in fig. 3, the diffuser module 100 includes a casing 110 covering the flange 20, and a closed impeller 120 disposed in the casing 110 and coaxially rotatably assembled to the outer ring of the flange 20, where the closed impeller 120 includes rotating discs 121 coaxially rotatably disposed on two sides of the flange 20 and curved blades 122 disposed between the rotating discs 121, the curved blades 122 are curved corrugated surfaces, the curved blades 122 are radially disposed along the flange 20, and multiple groups of curved blades 122 uniformly surround the outer ring of the flange 20; the vent 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. Arranging the exhaust port 130 on the housing 110 covering the flange 20, and forming a seal at the flange 20 by the valve control module 300 matched and assembled with the exhaust port 130, so as to provide a place and a condition for pressurizing gas for the diffuser module 100, wherein the bent blades 122 are arranged along the radial direction of the flange 20 and surround the outer ring of the flange 20, leaked gas firstly enters a channel between the bent blades 122, and because the bent blades 122 are in the shape of a bent corrugated curved surface, the leaked gas generates an acting force on the corrugated curved surface of the bent blades 122 to rotate the bent blades, and because the axial sectional area of the channel between the bent blades 122 is continuously enlarged, the pressure is continuously increased along with the diffusion process of the gas channel according to the bernoulli principle, and meanwhile, along with the continuous rotation of the leaked closed impeller 120, the gas is continuously accumulated between the outer ring of the closed impeller 120 and the inner wall of the housing 110, so as to continuously play a role of pressurizing, and realize the pressurization of the gas; after pressurization of the gas is completed, the valve control module 300 is opened, and the gas can enter the detection module 200 through the gas outlet 130; the diffusion module 100 of the invention automatically pressurizes leaked gas by utilizing the self structure of the closed impeller 120, and can pressurize the gas without external driving source input, so that the gas which originally does not reach the detection concentration reaches the concentration which can be detected after pressurization, and the diffusion module has the advantages of low use cost and good effect.
Further, in the present embodiment, the leak gas flow rate formula is: q = v × a, wherein: 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 has the formula: p +1/2 ρ v ^2+ ρ g h = C, while for gases, gravity can be ignored, simplifying the expression: p +1/2 ρ v ^2= C, wherein: p is the pressure of a certain point in the fluid, v is the flow velocity of the fluid at the point, ρ is the density of the fluid, g is the gravitational acceleration, h is the height of the point, and C is a constant, when the gas leaks, the leaking gas enters the channel between the curved blades 122, the flow velocity v of the fluid is reduced from the formula of the flow rate of the leaking gas due to the gradual expansion of the sectional area a of the channel of the curved blades 122, and when the flow velocity v of the fluid is reduced, the pressure P of the fluid is increased from the formula of the bernoulli equation.
As shown in fig. 5, the casing 110 is shaped as a volute and is disposed coaxially with the closed impeller 120, the spiral direction of the volute is the same as the rotation direction of the closed impeller 120, and the exhaust port 130 is disposed at the maximum cross section of the volute. The volute is characterized in that the cross-sectional area of an internal channel of the volute is continuously increased from inside to outside, the housing 110 is arranged in a volute shape and is coaxial with the shrouded impeller 120, the spiral direction of the housing is the same as the rotation direction of the shrouded impeller 120, gas between the outer edge of the shrouded impeller 120 and the inner wall of the housing 110 is driven to flow from inside to outside along with the rotation of the shrouded 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 shrouded impeller 120 and the inner wall of the housing 110 according to the bernoulli principle, and the pressure is increased to a peak value when the gas reaches the exhaust port 130 arranged at the maximum cross section of the volute, so that the exhaust port 130 is arranged at the maximum cross section of the volute, and the optimal pressurization effect is achieved.
Example two
Fig. 4, 6, 7, 9 and 10 show a second embodiment of a structure for rapidly detecting a leakage of hydrogen-loaded natural gas according to the present invention.
The present embodiment is similar to the embodiment, except that: the valve control module 300 comprises a gear 310 rotatably connected in the housing 110, an external tooth matching part 320 and an internal tooth matching part 330 which are arranged on the turntable 121 and can be respectively 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 axis 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 manner; the exhaust plate 340 is provided with a second chute 341, and the other end of the connecting rod 350 rotates and is slidably connected to the second chute 341; the external gear engagement portion 320 may open and maintain the open state of the discharge plate 340 when engaged with the gear 310, and the internal gear engagement portion 330 may close and maintain the closed state of the discharge plate 340 when engaged with the gear 310. 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 surface of the curved blades 122 causes the shrouded impeller 120 to rotate clockwise in the orientation of fig. 4.
In this embodiment, as shown in fig. 4 and 7, the rocking bar 360 connected to the axis of the gear 310 can rock along with the gear 310, since the gear 310 is rotatably disposed in the housing 110, the external tooth matching portion 320 and the internal tooth matching portion 330 disposed on the rotating disc 121 need to be engaged therewith to enable the gear to rotate, since the external tooth matching portion 320 is engaged with the gear 310 to enable the exhaust plate 340 to be opened, and the external tooth matching portion 320 is disposed on the side of the gear 310 away from the center of the rotating disc 121, when the external tooth matching portion 320 is engaged with the gear 310, the gear 310 and the rotating disc 121 can rotate along with the same direction to enable the rocking bar 360 to rock upward, because one end of the connecting rod 350 rotates and is slidably connected to the first chute 361 of the rocker 360, the other end rotates and is slidably connected to the second chute 341 of the exhaust plate 340, the exhaust plate 340 rotates and is arranged at the exhaust port 130, the rocker 360 swings upwards 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 jacks upwards to enable the exhaust plate 340 with the outer contour attached to the inner wall of the exhaust port 130 to be opened, after the exhaust plate 340 is opened, the gas in the shell 110 instantly enters the detection module 200 through the shell 110, and the exhaust plate 340 automatically and slowly rotates relative to the shell 110 until the outer contour is attached to the inner wall of the exhaust port 130 due to the downward resultant force of the exhaust plate and the connecting rod 350; however, in order to realize gradual periodic exhaust, an internal tooth meshing part which can make the exhaust plate 340 closed forcibly is additionally arranged, and the internal tooth matching part 330 is arranged at one side of the gear 310 close to the circle center of the rotating disc 121, so when the internal tooth matching part 330 is meshed with the gear 310, the gear 310 and the rotating disc 121 can rotate reversely, the rocker 360 swings downwards to make the connecting rod 350 rotate and slide relatively relative to the first sliding groove 361 and the second sliding groove 341, and finally the connecting rod 350 is pulled downwards to make the exhaust plate 340 closed; 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 exhaust plate 340 can be automatically opened and closed once when the turntable 121 rotates for one circle; after the shrouded impeller 120 starts to rotate, the gas is pressurized in the closing process of the exhaust plate 340, and the gas is discharged in the opening process of the exhaust plate 340; the realization utilizes internal tooth cooperation portion 330 and external tooth cooperation portion 320 to produce the effect that makes air discharge plate 340 open automatically and close gas vent 130 along with the unidirectional rotation of carousel 121 to the pressure boost that makes gas and release process can go on steadily by periodicity, is interrupted progressively to exhaust to leaking gas and avoids continuously gathering, has simple structure, practical efficient advantage.
In addition, in the present embodiment, as shown in fig. 9, when the exhaust plate 340 is in the closed state, the link 350 is at the initial position in the second sliding slot 341, and the initial position is close to the rotating shaft of the exhaust plate 340 rotating relative to the housing 110, so that the center of gravity is close to the rotating shaft, and at this time, the exhaust plate 340 receives the self gravity and the resultant force of the link 350 to the rotating shaft, so that the exhaust plate 340 maintains the downward closed state; as shown in fig. 10, after the external gear engaging 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 link 350 slides in the first sliding slot 361 and is ejected upward under the swinging action of the rocker 360, the exhaust plate 340 is acted by the upward ejection of the link 350, so that the other end of the link 350 slides in the second sliding slot 341, the link 350 slides from the initial position to the limit position in the second sliding slot 341, after the limit position is reached, the exhaust plate 340 is completely opened, at the moment of opening, the exhaust plate 340 is acted by the upward leakage gas impulse resultant force, the gravity of the exhaust valve itself and the resultant force of the downward action of the link 350 on the exhaust plate, at this time, the resultant force action point of the link 350 on the exhaust plate 340 is far away from the rotating shaft of the exhaust plate 340, the center of gravity falls on the side of the exhaust plate 340 close to the limit position of the link 350 in the second sliding slot 341, and after the gas is released, the exhaust plate 340 is only acted by the gravity of itself and the downward action of the link 350 on the exhaust plate 340, so that the exhaust plate 340 automatically rotates slowly relative to the outer contour and is attached to the inner wall of the exhaust port 130.
As shown in fig. 4, the internal gear engagement portion 330 and the external gear engagement portion 320 are disposed on two radially opposite sides of the rotating disk 121. The internal tooth matching part 330 and the external tooth matching part 320 are arranged on two opposite sides of the turntable 121 in the radial direction, so that the time from closing to opening of the exhaust plate 340 is the same as the time from opening to closing, and the insufficient pressurization degree or the excessive pressurization of the gas caused by the inconsistent pressurization and release time is avoided.
In addition, in this embodiment, through the setting of the two sides that the internal tooth meshing portion and the external tooth meshing portion are radially opposite, the exhaust valve is realized opening and closing at the rotatory in-process of a week of closed impeller 120, carries out periodic emission to the leakage gas, makes the periodic pulse signal of production in the detection module 200, and then detection module 200 can accurate and reliably detect the leakage 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 two side turntables 121, respectively. 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 turntables 121 on the two sides respectively, so that the exhaust plate 340 is stressed more uniformly and is suitable for the working condition of high-frequency continuous use.
EXAMPLE III
Referring to fig. 1, 2, 7 and 8, a third embodiment of a structure for rapidly detecting a hydrogen-loading gas leakage according to the present invention is shown.
This embodiment is similar to the first embodiment or the second embodiment, except that: the detection module 200 comprises a detection box body 210 which is used for covering the outer surface of the shell 110 to form a seal, and a gas sensor arranged in the detection box body 210; when the valve control module 300 is opened, the outer case 110 and the test box body 210 communicate through the exhaust port 130. Set up detection case body 210 cover and establish shell 110 and form sealedly, avoid leaking the external detection effect that leads to influencing gas sensor to gas by the gas that gas vent 130 released, when valve control module 300 opened, shell 110 and detection case body 210 communicate through gas vent 130.
Wherein, be equipped with pressure sensor and control system in the detection case body 210, and detection case body 210 is connected with the gas supply module, and gas supply module, gas sensor and pressure sensor and control system signal connection, the gas supply module can be to the interior supply inert gas of detection case body 210 to keep the pressure in the detection case body 210 to be greater than the pressure in the shell 110. The control system is used for receiving an electric signal of the pressure sensor and controlling the gas supply module, when gas leakage occurs, the pressure expansion module 100 pressurizes the gas and discharges the gas into the detection box body 210, the pressurized gas pressure is greater than the pressure in the detection box body 210, once the gas is released after the exhaust plate 340 is opened, 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 reduction of the pressure in the detection box body 210 and sends the electric signal to the control system, the control system controls the gas supply module to operate after receiving the electric signal, the gas supply module fills inert gas into the detection box body 210, the inert gas hardly performs chemical reaction, the inert gas is filled into the detection box body 210, the inert gas can well coexist with the gas, and the risk of ignition and explosion of the gas can be avoided; after pressure sensor detects that the pressure value in the detection case body 210 recovers to the level before the balance, send the signal of telecommunication for the gaseous supply module stop operation of control system control, it is greater than the atmospheric pressure in the shell 110 to keep the atmospheric pressure in the detection case body 210, make pressure effect on air discharge plate 340 surface, it pushes away connecting rod 350 downwards to change to make air discharge plate 340, thereby keep the stable normally closed state of air discharge plate 340, avoid appearing that external tooth cooperation portion 320 and gear 310 mesh last time open air discharge plate 340 back internal tooth cooperation portion 330 and gear 310 mesh air discharge plate 340 automatic closure too slowly lead to carrying out the circumstances that the pressure boost effect worsens to gas.
In addition, the inert gas includes a total of seven gases, namely helium, neon, argon, krypton, xenon, radon and gas, and helium which is most inert to the elements is adopted in the embodiment, so that the inert gas is colorless and tasteless under the conditions of normal temperature and normal pressure, has lower 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 arranged in parallel with the first panel 342, and an inclined plate 344 arranged 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 sliding groove 341 is formed in the first panel 342. The exhaust plate 340 is composed of a first panel 342, a second panel 343 and an inclined plate 344, so that the contact area of the exhaust plate 340 and 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 that the pressure difference exists between the inside and the outside is ensured; the second panel 343 is arranged in parallel with the first panel 342 to enable the middle inclined plate 344 to be rotatably connected to the shell 110, so that the whole rotating state is easier to control balance; when the exhaust plate 340 is arranged to be 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 to enable the gravity center of the first panel 342 to be larger than that of the second panel 343, the pressure difference acts on the first panel 342 more obviously, and the normally-closed effect of the exhaust plate 340 is enhanced.
As shown in fig. 8, the active surface of the first panel 342 has a larger area than the active surface of the second panel 343. The area of the action surface of the first panel 342 is larger than that of the action surface 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, since the user terminal has different requirements, for example, the combustion of a gas turbine of a gas power station, the combustion of a gas furnace in a home user, and the utilization of hydrogen energy such as the separation of hydrogen from hydrogen-doped natural gas to a hydrogen fuel cell, and the requirements on the hydrogen content and pressure fluctuation of the gas fuel are high, the control system is designed as a PLC system of a hydrogen gas regulation and control station in this embodiment, a concentration sensor and a component sensor are additionally provided in the detection module 200, the components and the concentrations of the components of the leaked gas 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 is regulated and controlled in linkage with the PLC system of the gas regulation and control station, the PLC system regulates and controls the natural gas or the hydrogen-doped natural gas output by the terminal by adjusting the ratio of the natural gas and the hydrogen gas from the gas supply source, and the other modules in the regulation and control station and the downstream modules in the regulation and control station cooperate with the detection module 200 to meet different requirements of the terminal user, and realize the accurate regulation and control of each parameter of the gas mixture in the station.
In the detailed description of the embodiments, various technical features may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a structure that can short-term test hydrogen-doped natural gas reveals, assembles flange (20) department of connecting between pipeline (10), its characterized in that: the gas leakage detection device comprises a diffusion module (100) which is assembled at a flange (20) and used for collecting leakage gas and pressurizing the leakage gas, and a detection module (200) which is covered outside the diffusion module (100) to form sealing and used for detecting the leakage gas, wherein the diffusion module (100) is provided with an exhaust port (130), and the gas leakage detection device also 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 sealing 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) is communicated with the detection module (200) through the exhaust port (130).
2. The structure for rapidly detecting the leakage of the hydrogen-loaded natural gas as claimed in claim 1, wherein: the diffuser module (100) comprises a shell (110) which covers the flange (20) and a closed impeller (120) which is arranged in the shell (110) and coaxially assembled on the outer ring of the flange (20) in a rotating manner, wherein the closed impeller (120) comprises rotating discs (121) which are coaxially arranged on two sides of the flange (20) in a rotating manner and bent blades (122) which are arranged between the rotating discs (121), the bent blades (122) are in a bent corrugated curved surface shape, the bent blades (122) are radially arranged along the flange (20), and a plurality of groups of bent blades (122) uniformly surround the outer ring of the flange (20); the exhaust port (130) is arranged on the outer shell (110), and when the valve control module (300) is closed, the outer 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).
3. The structure for rapidly detecting the leakage of the hydrogen-loaded natural gas as claimed in claim 2, wherein: the casing (110) is in a volute shape and is coaxial with the closed impeller (120), the spiral direction of the volute is the same as the rotating direction of the closed impeller (120), and the exhaust port (130) is arranged at the maximum section of the volute.
4. The structure capable of rapidly detecting leakage of hydrogen-loaded natural gas as claimed in claim 2, wherein: the valve control module (300) comprises a gear (310) rotatably connected in a shell (110), an external tooth matching part (320) and an internal tooth matching part (330) which are arranged on the turntable (121) and can be separately meshed with the gear (310), a vent plate (340) rotatably arranged on the vent (130) and the outer contour of which can be attached to the inner wall of the vent (130), and a connecting rod (350) arranged between the gear (310) and the vent plate (340); the axis of the gear (310) is connected with a rocker (360), the rocker (360) is provided with a first sliding groove (361), and one end of the connecting rod (350) rotates and is connected with the first sliding groove (361) in a sliding manner; the exhaust plate (340) is provided with a second sliding chute (341), and the other end of the connecting rod (350) rotates and is connected with the second sliding chute (341) in a sliding manner; the air discharge plate (340) can be opened when the external tooth matching part (320) is meshed with the gear (310), and the air discharge plate (340) can be closed and kept in a closed state when the internal tooth matching part (330) is 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) during the process of being opened to be closed.
5. The structure capable of rapidly detecting leakage of hydrogen-loaded natural gas as claimed in claim 4, wherein: the internal tooth matching part (330) and the external tooth matching part (320) are arranged on two opposite sides of the rotary disc (121) in the radial direction.
6. The structure for rapidly detecting the leakage of the hydrogen-loaded natural gas as claimed in claim 4, wherein: the internal tooth matching part (330), the external tooth matching part (320), the connecting rod (350), the gear (310) and a rocker (360) connected to the gear (310) are symmetrically arranged on two sides of the rotary table (121) respectively.
7. The structure for rapidly detecting the leakage of the hydrogen-loaded natural gas as claimed in claim 4, wherein: the detection module (200) comprises a detection box body (210) which is used for covering the outer surface of the shell (110) to form a seal, and a gas sensor arranged in the detection box body (210); when the valve control module (300) is opened, the shell (110) is communicated with the detection box body (210) through the exhaust port (130).
8. The structure for rapidly detecting the leakage of the hydrogen-loaded natural gas as claimed in claim 7, wherein: the detection box comprises a detection box body (210), wherein a pressure sensor and a control system are arranged in the detection box body (210), a gas supply module is connected to the detection box body (210), 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) larger than the pressure in the shell (110).
9. The structure for rapidly detecting the leakage of the hydrogen-loaded natural gas as claimed in claim 8, wherein: the exhaust plate (340) comprises a first panel (342), a second panel (343) arranged in parallel with the first panel (342), and an inclined plate (344) arranged 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 arranged on the first panel (342).
10. The structure for rapidly detecting the leakage of the hydrogen-loaded natural gas as claimed in claim 9, 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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| CN115711364B (en) | 2024-03-08 |
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