CN112509290A - High-sensitivity intelligent gas leakage alarm control system - Google Patents
High-sensitivity intelligent gas leakage alarm control system Download PDFInfo
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- CN112509290A CN112509290A CN202011352077.7A CN202011352077A CN112509290A CN 112509290 A CN112509290 A CN 112509290A CN 202011352077 A CN202011352077 A CN 202011352077A CN 112509290 A CN112509290 A CN 112509290A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
- G08B21/16—Combustible gas alarms
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/006—Alarm destination chosen according to type of event, e.g. in case of fire phone the fire service, in case of medical emergency phone the ambulance
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
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- Business, Economics & Management (AREA)
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Abstract
The invention discloses a high-sensitivity intelligent liquefied petroleum gas leakage alarm system, which comprises: the intelligent alarm system comprises a shell, a core control module, a micro-flow sensor, an in-place detection module, an alarm module, an NB-IoT module, a valve driving module, an electromagnetic valve, a power module and a safety management platform. The shell is used for connecting the pressure reducing valve and the gas rubber pipe and protecting each module. The shell is internally provided with a connecting pipeline, two ends of the connecting pipeline are respectively matched with a connector of the pressure reducing valve and a connector of the gas rubber pipe, and the connecting pipeline is made of non-conductive materials. The micro-flow sensor, the in-place detection module, the core controller, the valve driver, the electromagnetic valve, the NB-IoT module and the power module are arranged inside the shell, and the warning module is positioned outside the shell; the core control module of the invention judges whether the leakage condition exists or not by calculating the accumulated air volume, and the service life is greatly prolonged by the anti-pollution capability of the sensor and the low power consumption modes of the core control module and the NB-IoT module.
Description
Technical Field
The invention belongs to the field of gas leakage alarm equipment, and particularly relates to a high-sensitivity intelligent liquefied petroleum gas leakage alarm system.
Technical Field
The safety accidents of fire, explosion, poisoning and the like caused by household gas equipment emerge endlessly in the development process of the modern society, and cause great harm to the country, the society and individuals. Most of the gas accidents are caused by leakage, and therefore, the importance of the leakage alarm in the life of residents is high. The gas leakage alarm in the current market triggers the alarm by detecting the gas concentration in the air through a gas concentration sensor. The gas leakage alarm based on the gas concentration sensor has the following two disadvantages: firstly, in the case of ventilation, the concentration of gas in the air is not so high as to trigger an alarm, thus resulting in the waste of gas; secondly, the explosion limit of the gas in the air is very low, for example, the lower explosion limit concentration of natural gas is 5%, the lower explosion limit concentration of liquefied petroleum gas is 1.5%, and when a gas leakage alarm based on a gas concentration sensor finds danger, the processing time left for users or fire departments is not much. Therefore, the invention provides a gas leakage alarm based on micro-flow detection.
The impurities contained in the liquefied petroleum gas can pollute the sensor, so that the sensor fails, and the service life of the product is influenced. The micro-flow sensor selected by the invention has an anti-pollution function, and the service life of the product can be greatly prolonged.
In order to improve the safety of the product and prevent leakage caused by errors in the installation process, the invention also applies an in-place detection means for ensuring the reliable installation of the joint of the pressure reducing valve and the pressure reducing valve.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a high-sensitivity intelligent liquefied petroleum gas leakage alarm system.
The intelligent liquefied petroleum gas leakage alarm system monitors the gas leakage in real time, gives an audible and visual alarm after the gas leakage exceeds a threshold value, sends an address and an alarm instruction to a safety management platform, and automatically closes a valve to cut off a gas source.
A high-sensitivity intelligent liquefied petroleum gas leakage alarm system comprising: the intelligent alarm system comprises a shell, a core control module, a micro-flow sensor, an in-place detection module, an alarm module, an NB-IoT module, a valve driving module, an electromagnetic valve, a power module and a safety management platform.
The shell is used for connecting the pressure reducing valve and the gas rubber pipe and protecting each module. The gas-pressure reducing valve is characterized in that a connecting pipeline is arranged in the shell, two ends of the connecting pipeline are respectively matched with a connector of the pressure reducing valve and a connector of the gas rubber pipe, and the connecting pipeline is made of non-conductive materials. The micro-flow sensor, the in-place detection module, the core controller, the valve driver, the electromagnetic valve, the NB-IoT module and the power module are arranged inside the shell, and the warning module is positioned outside the shell;
the power supply module is respectively connected with the core control module, the micro-flow sensor, the in-place detection module, the warning module, the NB-IoT module and the valve driving module and provides power for the core control module, the micro-flow sensor, the in-place detection module, the warning module, the NB-IoT module and the valve driving module;
the micro-flow sensor is connected with the core control module, the micro-flow sensor directly measures the airflow in the channel in the shell and transmits the airflow to the core control module, and the core control module calculates the accumulated air volume according to the acquired airflow;
the in-place detection module is connected with the core control module and is used for detecting the assembling position information and transmitting the assembling position information to the core control module for processing;
the warning module is connected with the core control module, and when the core control module detects micro leakage or is not installed in place, the warning module is controlled to give out sound and light alarm;
the NB-IoT module is connected with the core control module and comprises a GPS module, and when the core control module detects micro-flow leakage, the NB-IoT module sends the position information acquired by the GPS module to the safety management platform;
the valve driving module is connected with the core control module and used for receiving a control signal sent by the core control module and controlling the on-off of the electromagnetic valve; the electromagnetic valve is connected with the valve driving module, and when the valve driving module receives a valve closing instruction, a channel between the two interfaces of the shell is cut off.
The shell is connected with the pressure reducing valve in an insertion mode, the interface of the pressure reducing valve is directly inserted into the interface part of the connecting pipeline in the shell, and the interface of the connecting pipeline is made of elastic materials.
The shell is connected with the gas rubber pipe by adopting the buckling and pressing connection of an additional rubber pipe clamp.
The core control module is a single chip microcomputer with a low power consumption mode and a watchdog function.
The micro-flow sensor adopts a thermal flow sensor based on a micro-electro-mechanical system, can accurately identify the micro flow in the pipeline within the range of 1L/h to 20L/h, and has anti-pollution capacity.
The calculation of the accumulated gas amount is specifically as follows:
the micro-flow sensor is measured in dt [ s ]]Giving a current measured flow value Q for a periodN[m3/s]N represents the current accumulated period number and the accumulated gas volume VN[m3]The calculation formula of (2) is as follows:
N＝1，2，3，…,V0＝0，Q0＝0。
the accumulated gas volume VNWhen the light leakage threshold value is reached, the equipment sends out an acousto-optic alarm and sends a light leakage instruction to the safety platform, and the safety platform sends a short message to a user to prompt the user to go home to check the leakage condition.
When the accumulated gas volume V isNWhen the medium leakage threshold is reached, the equipment continues to give out sound and light alarm and is closedThe electromagnetic valve sends a moderate leakage instruction to the safety platform, and the safety platform sends a short message to a user to inform the user that the electromagnetic valve is closed and prompt the user to check the leakage condition.
When the accumulated gas volume V isNWhen the severe leakage threshold value is reached, the electromagnetic valve cannot be kept closed at the moment and the user cannot process the leakage condition, the equipment continues to send out audible and visual alarms and sends a severe leakage instruction to the safety platform, the safety platform sends a short message to the user to inform the leakage condition, sends the short message to 110 or 119 to alarm and sends position information of the gas leakage site.
The power supply module can convert a voltage in a range of 2.5V to 7V into a 3.3V regulated voltage.
The warning module comprises a buzzer and an LED.
The in-place detection module is used for judging whether the equipment is matched with the pressure reducing valve in place or not during installation.
The in-place detection module comprises a first in-place detection point, a second in-place detection point and a resistor, wherein the lower end of the first in-place detection point is of a hemispherical structure and penetrates through a detection hole formed in the connecting pipeline, the upper end of the first in-place detection point is of a cylindrical structure, a check ring is arranged at the joint of the upper end and the lower end and used for limiting the displacement of the first in-place detection point to the inside of the connecting pipeline, a reset spring is arranged on one side of the check ring, which is opposite to the connecting pipeline, the other side of the reset spring is fixed on the shell, the diameter of the second in-place detection point is smaller than that of the reset spring, the center of the shell fixedly connected with the reset spring is not contacted with the reset spring, the detection hole is arranged at the tail end of the joint of the connecting pipeline and the interface of the pressure reducing valve, the interface of the pressure reducing, the second in-place detection point is connected with a potential output port of the core control module through a resistor.
When the pressure reducing valve and the equipment are assembled, the first in-place detection point and the second in-place detection point are contacted with each other, the in-place detection circuit is conducted, the potential input port of the core control module is conducted with the potential output port, the potential input port of the core control module detects voltage, namely, the assembly is successful, if the voltage is not detected, the assembly is not successful, and the core control module controls the warning module to send out sound and light alarm. When the pressure reducing valve is disengaged, the first in-place detection point is reset through the reset spring.
The invention has the following beneficial effects:
the invention monitors the leakage condition in real time through the micro-flow sensor. The core control module calculates the accumulated air volume according to the micro-flow information transmitted by the sensor. And when the accumulated gas amount exceeds a threshold value, the core control module judges that a leakage condition exists. Leak detection based on this model may detect leaks earlier than concentration detection, striving for more processing time for users or fire officers.
The sensor has the advantages that the service life is greatly prolonged through the self anti-pollution capability of the sensor, the core control module and the low power consumption mode of the NB-IoT module.
The invention ensures the product to be accurately installed by an in-place detection means, and the alarm is sent out by separation.
Drawings
FIG. 1 is a structural frame diagram of the present invention;
FIG. 2 is a schematic structural diagram of an in-place detection module according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1, a high-sensitivity intelligent liquefied petroleum gas leakage alarm system includes: the intelligent alarm system comprises a shell, a core control module, a micro-flow sensor, an in-place detection module, an alarm module, an NB-IoT module, a valve driving module, an electromagnetic valve, a power module and a safety management platform.
The shell is used for connecting the pressure reducing valve and the gas rubber pipe and protecting each module. The gas-pressure reducing valve is characterized in that a connecting pipeline is arranged in the shell, two ends of the connecting pipeline are respectively matched with a connector of the pressure reducing valve and a connector of the gas rubber pipe, and the connecting pipeline is made of non-conductive materials. The micro-flow sensor, the in-place detection module, the core controller, the valve driver, the electromagnetic valve, the NB-IoT module and the power module are arranged inside the shell, and the warning module is positioned outside the shell; the power supply module is respectively connected with the core control module, the micro-flow sensor, the in-place detection module, the warning module, the NB-IoT module and the valve driving module and provides power for the core control module, the micro-flow sensor, the in-place detection module, the warning module, the NB-IoT module and the valve driving module; the micro-flow sensor is connected with the core control module, the micro-flow sensor directly measures the airflow in the channel in the shell and transmits the airflow to the core control module, and the core control module calculates the accumulated air volume according to the acquired airflow; the in-place detection module is connected with the core control module and is used for detecting the assembling position information and transmitting the assembling position information to the core control module for processing; the warning module is connected with the core control module, and when the core control module detects micro leakage or is not installed in place, the warning module is controlled to give out sound and light alarm; the NB-IoT module is connected with the core control module and comprises a GPS module, and when the core control module detects micro-flow leakage, the NB-IoT module sends the position information acquired by the GPS module to the safety management platform; the valve driving module is connected with the core control module and used for receiving a control signal sent by the core control module and controlling the on-off of the electromagnetic valve; the electromagnetic valve is connected with the valve driving module, and when the valve driving module receives a valve closing instruction, a channel between the two interfaces of the shell is cut off.
The shell is connected with the pressure reducing valve in an insertion mode, the interface of the pressure reducing valve is directly inserted into the interface part of the connecting pipeline in the shell, and the interface of the connecting pipeline is made of elastic materials.
The shell is connected with the gas rubber pipe by adopting the buckling and pressing connection of an additional rubber pipe clamp.
The core control module is a single chip microcomputer with a low power consumption mode and a watchdog function.
The micro-flow sensor adopts a thermal flow sensor based on a micro-electro-mechanical system, can accurately identify the micro flow in the pipeline within the range of 1L/h to 20L/h, and has anti-pollution capacity.
The parameters of the micro flow sensor are adapted to the liquefied petroleum gas.
The calculation of the accumulated gas amount is specifically as follows:
the micro-flow sensor is measured in dt [ s ]]Giving a current measured flow value Q for a periodN[m3/s]N represents the current accumulated period number and the accumulated gas volume VN[m3]The calculation formula of (2) is as follows:
N＝1，2，3，…,V0＝0，Q0＝0。
the accumulated gas volume VNWhen the light leakage threshold value is reached, the equipment sends out an acousto-optic alarm and sends a light leakage instruction to the safety platform, and the safety platform sends a short message to a user to prompt the user to go home to check the leakage condition.
When the accumulated gas volume V isNWhen the medium leakage threshold value is reached, the default user does not see the short message or cannot go home temporarily, the equipment continues to give out sound and light alarm, the electromagnetic valve is closed, the medium leakage instruction is sent to the safety platform, the safety platform sends the short message to the user, the user is informed that the electromagnetic valve is closed, and the user is prompted to check the leakage condition.
When the accumulated gas volume V isNWhen the severe leakage threshold value is reached, the electromagnetic valve cannot be kept closed at the moment and the user cannot process the leakage condition, the equipment continues to send out audible and visual alarms and sends a severe leakage instruction to the safety platform, the safety platform sends a short message to the user to inform the leakage condition, sends the short message to 110 or 119 to alarm and sends position information of the gas leakage site.
The power supply module can convert a voltage in a range of 2.5V to 7V into a 3.3V regulated voltage.
The warning module comprises a buzzer and an LED.
The in-place detection module is used for judging whether the equipment is matched with the pressure reducing valve in place or not during installation.
The in-place detection module comprises a first in-place detection point, a second in-place detection point and a resistor, as shown in figure 2, the lower end of the first in-place detection point is of a hemispherical structure and penetrates through a detection hole formed in the connecting pipeline, the upper end of the first in-place detection point is of a cylindrical structure, a check ring is arranged at the joint of the upper end and the lower end and used for limiting the displacement of the first in-place detection point to the inside of the connecting pipeline, a return spring is arranged on one side of the check ring, which is back to the connecting pipeline, the other side of the return spring is fixed on the shell, the diameter of the second in-place detection point is smaller than that of the return spring, the center of the shell fixedly connected with the return spring is not contacted with the return spring, the detection hole is arranged at the tail end of the joint of the connecting pipeline and, the first in-place detection point is connected with a potential input port of the core control module, and the second in-place detection point is connected with a potential output port of the core control module through a resistor.
When the pressure reducing valve and the equipment are assembled, the first in-place detection point and the second in-place detection point are contacted with each other, the in-place detection circuit is conducted, the potential input port of the core control module is conducted with the potential output port, the potential input port of the core control module detects voltage, namely, the assembly is successful, if the voltage is not detected, the assembly is not successful, and the core control module controls the warning module to send out sound and light alarm. When the pressure reducing valve is disengaged, the first in-place detection point is reset through the reset spring.
Claims (8)
1. A high-sensitivity intelligent liquefied petroleum gas leakage alarm system is characterized by comprising a shell, a core control module, a micro-flow sensor, an in-place detection module, an alarm module, an NB-IoT module, a valve driving module, an electromagnetic valve, a power supply module and a safety management platform;
the shell is connected with the pressure reducing valve and the gas rubber pipe and protects each module; a connecting pipeline is arranged in the shell, two ends of the connecting pipeline are respectively matched with a connector of the pressure reducing valve and a connector of the gas rubber pipe, and the connecting pipeline is made of non-conductive materials; the micro-flow sensor, the in-place detection module, the core controller, the valve driver, the electromagnetic valve, the NB-IoT module and the power module are arranged inside the shell, and the warning module is positioned outside the shell;
the power supply module is respectively connected with the core control module, the micro-flow sensor, the in-place detection module, the warning module, the NB-IoT module and the valve driving module and provides power for the core control module, the micro-flow sensor, the in-place detection module, the warning module, the NB-IoT module and the valve driving module;
the micro-flow sensor is connected with the core control module, the micro-flow sensor directly measures the airflow in the channel in the shell and transmits the airflow to the core control module, and the core control module calculates the accumulated air volume according to the acquired airflow;
the in-place detection module is connected with the core control module and is used for detecting the assembling position information and transmitting the assembling position information to the core control module for processing;
the warning module is connected with the core control module, and when the core control module detects micro leakage or is not installed in place, the warning module is controlled to give out sound and light alarm;
the NB-IoT module is connected with the core control module and comprises a GPS module, and when the core control module detects micro-flow leakage, the NB-IoT module sends the position information acquired by the GPS module to the safety management platform;
the valve driving module is connected with the core control module and used for receiving a control signal sent by the core control module and controlling the on-off of the electromagnetic valve; the electromagnetic valve is connected with the valve driving module, and when the valve driving module receives a valve closing instruction, a channel between the two interfaces of the shell is cut off.
2. The intelligent liquefied petroleum gas leakage alarm system with high sensitivity as claimed in claim 1, wherein the connection between the housing and the pressure reducing valve is a plug-in connection, the interface of the pressure reducing valve is directly inserted into the interface portion of the connection pipe in the housing, and the interface of the connection pipe is made of elastic material.
3. The intelligent liquefied petroleum gas leakage alarm system with high sensitivity as claimed in claim 1, wherein the connection between the housing and the gas hose is a snap connection with an additional hose clip.
4. The intelligent liquefied petroleum gas leakage alarm system with high sensitivity as claimed in claim 1, wherein the core control module is a single chip with low power consumption mode and watchdog function.
5. The intelligent liquefied petroleum gas leakage warning system with high sensitivity as claimed in claim 1, wherein the micro flow sensor adopts a thermal flow sensor based on a micro electro mechanical system, can accurately identify micro flow in the pipeline within the range of 1L/h to 20L/h, and has anti-pollution capability;
the calculation of the accumulated gas amount is specifically as follows:
the micro-flow sensor is measured in dt [ s ]]Giving a current measured flow value Q for a periodN[m3/s]N represents the current accumulated period number and the accumulated gas volume VN[m3]The calculation formula of (2) is as follows:
N＝1，2，3，…，V0＝0，Q0＝0；
the accumulated gas volume VNWhen the light leakage threshold value is reached, the equipment sends out an audible and visual alarm and sends a light leakage instruction to the safety platform, and the safety platform sends a short message to a user to prompt the user to go home to check the leakage condition;
when the accumulated gas volume V isNWhen the medium leakage threshold value is reached, the equipment continuously gives out an acousto-optic alarm, the electromagnetic valve is closed and a medium leakage instruction is sent to the safety platform, the safety platform sends a short message to a user to inform the user that the electromagnetic valve is closed and prompt the user to check the leakage condition;
when the accumulated gas volume V isNWhen the severe leakage threshold value is reached, the electromagnetic valve cannot be kept closed and the user cannot process the leakage condition, the equipment continues to give out sound and light alarm and sends a severe leakage instructionAnd when the gas leakage occurs, the safety platform sends a short message to the user to inform the leakage condition, sends the short message to 110 or 119 to alarm and sends the position information of the gas leakage place.
6. The intelligent liquefied petroleum gas leakage warning system according to claim 1, wherein the power supply module is capable of converting a voltage in a range of 2.5V to 7V to a 3.3V regulated voltage.
7. The intelligent liquefied petroleum gas leakage warning system according to claim 1, wherein the warning module comprises a buzzer and an LED.
8. The intelligent liquefied petroleum gas leakage warning system with high sensitivity according to any one of claims 1 to 7, wherein the in-place detection module is used for judging whether the equipment is matched with the pressure reducing valve in place or not when the equipment is installed;
the in-place detection module comprises a first in-place detection point, a second in-place detection point and a resistor, wherein the lower end of the first in-place detection point is of a hemispherical structure and penetrates through a detection hole formed in the connecting pipeline, the upper end of the first in-place detection point is of a cylindrical structure, a check ring is arranged at the joint of the upper end and the lower end and used for limiting the displacement of the first in-place detection point to the inside of the connecting pipeline, a reset spring is arranged on one side of the check ring, which is opposite to the connecting pipeline, the other side of the reset spring is fixed on the shell, the diameter of the second in-place detection point is smaller than that of the reset spring, the center of the shell fixedly connected with the reset spring is not contacted with the reset spring, the detection hole is arranged at the tail end of the joint of the connecting pipeline and the interface of the pressure reducing valve, the interface of the pressure reducing, the second in-place detection point is connected with a potential output port of the core control module through a resistor;
when the pressure reducing valve and the equipment are assembled, the first in-place detection point and the second in-place detection point are contacted with each other, the in-place detection circuit is conducted, the potential input port of the core control module is conducted with the potential output port, the potential input port of the core control module detects voltage, namely, the assembly is successful, if the voltage is not detected, the assembly is not successful, and the core control module controls the warning module to send out sound and light alarm; when the pressure reducing valve is disengaged, the first in-place detection point is reset through the reset spring.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114255571A (en) * | 2022-02-11 | 2022-03-29 | 内蒙古中科装备有限公司 | Safety guarantee alarm method, system and medium for liquid hydrogen storage |
| CN114493323A (en) * | 2022-02-11 | 2022-05-13 | 内蒙古中科装备有限公司 | Method, system and medium for emergency purging of hydrogen storage vessels |
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| CN205612546U (en) * | 2016-03-25 | 2016-10-05 | 上海瑞柯恩激光技术有限公司 | Laser equipment with optic fibre detection function that targets in place |
| CN206545733U (en) * | 2017-03-07 | 2017-10-10 | 江苏盐阜电站阀门辅机制造有限公司 | A kind of Intelligent pressure reducing valve for being easily installed positioning |
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| CN207261413U (en) * | 2017-06-12 | 2018-04-20 | 核动力运行研究所 | A kind of bolt of band detection function in place |
| CN108389366A (en) * | 2018-04-10 | 2018-08-10 | 江苏吉泰安防科技有限公司 | Gas safe supervises Internet of Things cloud platform and alarm method |
| CN210442881U (en) * | 2019-10-23 | 2020-05-01 | 宁夏隆基宁光仪表股份有限公司 | Internet of things gas meter with gas leakage detection alarm function |
| CN111238589A (en) * | 2020-01-20 | 2020-06-05 | 广州燃气集团有限公司 | Intelligent gas meter, system and method capable of monitoring household gas leakage state |
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| CN114255571A (en) * | 2022-02-11 | 2022-03-29 | 内蒙古中科装备有限公司 | Safety guarantee alarm method, system and medium for liquid hydrogen storage |
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