CN112856241B - Household natural gas leakage automatic detection protection system and method - Google Patents
Household natural gas leakage automatic detection protection system and method Download PDFInfo
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- CN112856241B CN112856241B CN202110048778.XA CN202110048778A CN112856241B CN 112856241 B CN112856241 B CN 112856241B CN 202110048778 A CN202110048778 A CN 202110048778A CN 112856241 B CN112856241 B CN 112856241B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
Abstract
The invention discloses a household natural gas leakage automatic detection protection system and method, comprising a bistable gas valve, a low-power consumption control part and an airflow triggering part, wherein the bistable gas valve and the airflow triggering part are respectively connected with the low-power consumption control part; the air flow triggering part comprises an air impeller arranged in the pipeline, a permanent magnet and an induction coil arranged outside the pipeline, wherein the permanent magnet is arranged on a blade of the air impeller, and the induction coil is arranged in the magnetic field range of the permanent magnet; the opening and closing ends of the bistable air valve are positioned in the pipeline and positioned on the air inlet side of the gas impeller; the low power consumption control part is arranged outside the pipeline. The invention realizes the direct monitoring of the change of the air flow in the pipeline, has accurate monitoring result and little energy consumption, can effectively realize the automatic detection and protection of the household natural gas leakage, is suitable for household use, and has strong practicability.
Description
Technical Field
The invention relates to the field of household natural gas safety, in particular to a household natural gas leakage automatic detection protection system and method.
Background
With the development of the industry in China, fuel gas has become an indispensable energy source in people's life. More and more natural gas users, whether young or old, often forget to close the valve, thereby causing a great potential safety hazard. The existing gas system safety design mainly has two disadvantages: 1) When the operation parameters of the gas system are collected, an indirect method is adopted, whether gas is leaked or not is judged by measuring the concentration of the gas in the air, and the measurement sensitivity is poor; 2) Most of the systems are fixed in specific fuel gas systems, and the systems have poor universality and portability.
According to the search, the prior art has disclosed some relevant documents which can prevent natural gas leakage through a relatively direct gas detection mode, for example, chinese patent publication No. CN110307473A is exclusively used in 2019, 10 and 8 days, and discloses a household safe and leakproof natural gas flow regulating device, which comprises a gas supply pipeline and a gas guide block penetrated by the gas supply pipeline, wherein a gas transmission cavity with a rightward opening is arranged in the gas guide block, the gas transmission cavity and the gas supply pipeline are communicated through a communicating pipeline, a flow regulating mechanism is arranged in the gas transmission cavity, a cutting mechanism is further arranged in the gas supply pipeline, a transmission mechanism which can judge whether gas leaks when natural gas is not conveyed is arranged in the lower end wall of the gas transmission cavity, and a driving mechanism which controls the operation of the device is further arranged in the left end wall of the communicating pipeline. This patent application can be when closing natural gas and carry, and whether the automatic judgement leaks gas, and automatic shutoff air supply pipeline prevents that natural gas from revealing greatly increased when leaking gas to the dangerous is triggered, and the alarm lamp lights simultaneously, and the suggestion is revealed, makes flow control automatic and transmission efficiency obtain improving through mechanical transmission. For another example, chinese patent publication No. CN204348035U discloses an automatic safety detection device for household natural gas leakage in 2015, 5 and 20 days, the control circuit includes a power module, a key module, a main control module, a conversion module, a display module and a coupling module, the main control module is respectively connected with the conversion module, the key module, the coupling module and the display module, the power module is respectively connected with the main control module, the conversion module and the coupling module, the conversion module is respectively connected with a flowmeter arranged in a natural gas pipeline and a thermocouple arranged at the flame combustion position of a natural gas stove, the coupling module is connected with an electromagnetic valve arranged on the natural gas pipeline, the detection and protection of household natural gas stove or liquefied gas stove and pipeline gas leakage are realized by the patent, but the control circuit has more containing modules, high energy consumption and is unfavorable for practical application.
At present, a household natural gas detection system does not exist, and can automatically detect the change of the air flow in a natural gas pipeline under the passive condition, excite the protection system to work and judge whether the protection system is abnormal or not, so that the natural gas is actively cut off.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the household natural gas leakage automatic detection protection system and the household natural gas leakage automatic detection protection method, which can automatically detect the change of the air flow in the natural gas pipeline under the passive condition and activate the protection system to work, thereby greatly improving the use safety of the natural gas.
According to an aspect of the specification, the invention provides a household natural gas leakage automatic detection protection system, which comprises a bistable gas valve, a low-power-consumption control part and an airflow triggering part, wherein the bistable gas valve and the airflow triggering part are respectively connected with the low-power-consumption control part; the air flow triggering part comprises an air impeller arranged in the pipeline, a permanent magnet and an induction coil arranged outside the pipeline, wherein the permanent magnet is arranged on a blade of the air impeller, and the induction coil is arranged in the magnetic field range of the permanent magnet; the opening and closing ends of the bistable air valve are positioned in the pipeline and positioned on the air inlet side of the gas impeller; the low power consumption control part is arranged outside the pipeline.
According to the technical scheme, the bistable air valve is in an open state at ordinary times, when air is used, air flows in a pipe, the air impeller is driven to rotate, the air impeller rotates to drive the permanent magnets on the blades to rotate, when the permanent magnets rotate to be opposite to the induction coil, a weak electric signal is generated at two ends of the induction coil, the electric signal is sent to the awakening port of the low-power consumption control part after being rectified, the low-power consumption control part is awakened, the low-power consumption control part is used as an air flow meter after being awakened, the air consumption condition in a pipeline is monitored (one pulse is sent every turn of the air impeller), meanwhile, the environment is detected, the current air consumption condition and the environment information are combined to judge whether the air consumption is normal or not, if the air consumption is abnormal, the air valve is triggered to act to close the air valve, and then the air valve enters a dormant state until the air is awakened again.
According to the technical scheme, the air flow in the air pipeline drives the permanent magnet to rotate so that the induction coil generates an electric signal, and then the electric signal wakes up the low-power consumption control part and carries out air flow measurement so as to judge whether the air consumption is normal, so that the air flow change in the pipeline is directly monitored, the monitoring result is accurate, the energy consumption is low, the automatic detection and protection of household natural gas leakage can be effectively realized, the air-conditioner is suitable for household use, and the practicability is high.
As a further technical scheme, the induction coil is connected with a rectifying circuit for rectifying an alternating electric signal generated by the induction coil into a direct current pulse signal; the output end of the rectifying circuit is connected with the low-power-consumption control part and is used for inputting a direct-current pulse signal into the low-power-consumption control part to wake up the low-power-consumption control function. The rectifying circuit includes an energy storage capacitor for storing energy to wake up the low power consumption control portion. The energy storage capacitor is smaller, only a certain amount of energy is needed to be gathered to wake up the low-power consumption control part, and the battery is used for supplying power after the low-power consumption control part is waken up.
As a further technical scheme, the low power consumption control part is connected with an infrared sensor, and the low power consumption control part and the infrared sensor are respectively connected with the battery assembly. The infrared sensor is used for detecting the movement condition of nearby people, such as detecting whether people move in a kitchen or whether people do not exist for a long time, and the detection data of the infrared sensor is sent to the low-power consumption control part and used for assisting in judging whether the current gas flow in the pipeline is normal.
As a further technical scheme, the permanent magnet is arranged on any blade of the gas impeller, and the induction coil is positioned in the rotating plane of the permanent magnet and is in a right-facing state with the permanent magnet at least one rotating position. The permanent magnet is used for generating an alternating magnetic field when rotating, so that an induction coil opposite to the permanent magnet can generate an electric signal; therefore, the induction coil is only required to be positioned in the magnetic field range of the permanent magnet and can be in a facing state with the permanent magnet at least one rotating position, when the permanent magnet rotates to the at least one rotating position, the permanent magnet and the induction coil are in the facing state, so that the induction coil generates weak electric signals, and the electric signals can wake up the low-power consumption control part to monitor the gas flow after rectification.
As a further technical scheme, the blades of the gas impeller are vertically arranged, and the induction coil is positioned above or below the gas impeller. The gas impeller is vertically arranged in the pipeline, and when gas flows in the pipeline, the gas impeller rotates on a vertical plane to drive the permanent magnet to rotate on the vertical plane; the induction coil is arranged above or below the gas impeller and is positioned on the rotating plane of the permanent magnet, so that at least one rotating position of the permanent magnet can be opposite to the induction coil when the permanent magnet rotates, namely, the induction coil is positioned right above or right below the induction coil.
As a further technical scheme, the blades of the gas impeller are horizontally arranged, and the induction coil is positioned at a position vertical to the direction of the gas flow on the horizontal plane. The gas impeller is horizontally arranged in the pipeline, and when gas flows in the pipeline, the gas impeller rotates on a horizontal plane to drive the permanent magnet to rotate on the horizontal plane; the induction coil is arranged on the side face of the gas impeller and is positioned on the rotating plane of the permanent magnet, so that at least one rotating position opposite to the induction coil can be ensured when the permanent magnet rotates. Further, for a pipe which is horizontally arranged and extends in the left-right direction, the gas impeller is also horizontally arranged in the pipe, and the induction coil is arranged in front of or behind the gas impeller and the permanent magnet which fills at least one rotation position is opposite to the induction coil.
According to an aspect of the present disclosure, there is provided a method for automatically detecting and protecting from leakage of natural gas in a household, comprising:
when gas flows in the pipeline, the gas impeller is driven to rotate by the gas flow, the permanent magnet on the gas impeller is driven to rotate, an alternating magnetic field is generated, the induction coil generates an alternating electric signal, and the alternating electric signal wakes up the low-power consumption control part after rectification;
the low-power consumption control part performs gas flow measurement and simultaneously judges whether the gas consumption is normal according to the movement condition of nearby people;
if not, triggering the bistable air valve to act to close the air valve.
According to the technical scheme, the bistable air valve is in an open state at ordinary times, when air is used, air flows in a pipe, the air impeller is driven to rotate, the air impeller rotates to drive the permanent magnets on the blades to rotate, when the permanent magnets rotate to be opposite to the induction coil, a weak electric signal is generated at two ends of the induction coil, the electric signal is sent to the awakening port of the low-power consumption control part after being rectified, the low-power consumption control part is awakened, the low-power consumption control part is used for measuring air flow after being awakened, the air consumption condition in a pipeline is monitored, meanwhile, the movement condition of nearby people is detected, then whether the air consumption is normal is judged by combining the current air consumption condition and the movement condition of nearby people, and if the air consumption is abnormal, the air valve is triggered to be closed. The low-power consumption control part is in a dormant state at ordinary times, is powered by a battery to monitor gas consumption and detect environment after being awakened, triggers a valve to act to close a gas valve when judging that the gas consumption is abnormal, then enters the dormant state until being awakened again, and the method monitors the gas flow in the pipeline directly and keeps the dormant state when no abnormal condition exists, thereby not only meeting the requirements of accuracy and safety of automatic detection and protection of household natural gas leakage, but also having the advantages of low power consumption and strong practicability and meeting the requirements of the masses on household safety equipment.
As a further technical solution, the method further includes: when the low power consumption control part detects that the gas flow in the pipeline is abnormal, or detects that no person nearby moves for more than a preset time, or detects that gas flows in abnormal time, the bistable gas valve is actively triggered to close the gas valve. The low-power consumption control part has a flow metering function, receives character movement data detected by the infrared sensor, and comprehensively judges whether other flow in the current pipeline is abnormal or not by combining the current air flow and the character movement data in the current area. Or, the range of the person moving time in the target area is preset, when the person moving is not detected in the preset time, namely, whether the person is using gas in the target area is judged, if the gas in the pipeline flows at the moment, the natural gas leakage can be judged, and the valve is triggered to be closed automatically. Or presetting an abnormal time range, and when the gas flow in the pipeline is detected in the abnormal time range and the movement of the person in the target area is not detected, judging that the natural gas leakage occurs in the target area and triggering the valve to be automatically closed.
Compared with the prior art, the invention has the beneficial effects that:
(1) The bistable air valve is in an open state at ordinary times, when air is used, air flows in a pipe, the air impeller is driven to rotate, the air impeller rotates to drive the permanent magnet on the blade to rotate, when the permanent magnet rotates to be opposite to the induction coil, a weak electric signal is generated at two ends of the induction coil, the electric signal is sent to a wake-up port of the low-power consumption control part after being rectified, the low-power consumption control part is awakened, the low-power consumption control part is used for measuring air flow after being awakened, the air consumption condition in a pipeline is monitored (one pulse is sent out every turn of the air impeller), meanwhile, the environment is detected, whether the air consumption is normal is judged by combining the current air consumption condition and the environment information, if the air consumption is abnormal, the air valve is triggered to act to close the air valve, and then the air valve enters a dormant state until the air consumption is awakened again. According to the invention, the induction coil generates an electric signal in a mode that the permanent magnet is driven to rotate by air flow in the air pipeline, and then the low-power consumption control part is awakened by the electric signal and air flow measurement is carried out to judge whether air is normally used, so that the air flow change in the pipeline is directly monitored, the monitoring result is accurate, the energy consumption is low, the automatic detection and protection of household natural gas leakage can be effectively realized, the air-conditioner is suitable for household use, and the practicability is strong.
(2) The low-power consumption control part of the invention is in a dormant state at ordinary times, is powered by a battery to perform gas consumption monitoring and environment detection after being awakened, triggers a valve to act to close a gas valve when judging that the gas consumption is abnormal, and then enters the dormant state until being awakened again.
Drawings
Fig. 1 is a schematic structural view of a home natural gas leakage automatic detection protection system according to an embodiment of the present invention.
In the figure: 1. a bistable gas valve; 2. a gas impeller; 3. a permanent magnet; 4. an induction coil; 5. a low-power consumption MCU; 6. an infrared sensor; 7. and a battery.
Detailed Description
The following description of the embodiments of the present invention will be made in detail and with reference to the accompanying drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
According to an aspect of the specification, the invention provides a household natural gas leakage automatic detection protection system, which comprises a bistable gas valve, a low-power-consumption control part and an airflow triggering part, wherein the bistable gas valve and the airflow triggering part are respectively connected with the low-power-consumption control part; the air flow triggering part comprises an air impeller arranged in the pipeline, a permanent magnet and an induction coil arranged outside the pipeline, wherein the permanent magnet is arranged on a blade of the air impeller, and the induction coil is arranged in the magnetic field range of the permanent magnet; the opening and closing ends of the bistable air valve are positioned in the pipeline and positioned on the air inlet side of the gas impeller; the low power consumption control part is arranged outside the pipeline.
As one embodiment, the induction coil is connected with a rectifying circuit, and the rectifying circuit is used for rectifying an alternating electric signal generated by the induction coil into a direct current pulse signal; the output end of the rectifying circuit is connected with the low-power-consumption control part and is used for inputting a direct-current pulse signal into the low-power-consumption control part to wake up the low-power-consumption control function. The rectifying circuit includes an energy storage capacitor for storing energy to wake up the low power consumption control portion. The energy storage capacitor is smaller, only a certain amount of energy is needed to be gathered to wake up the low-power consumption control part, and the battery is used for supplying power after the low-power consumption control part is waken up.
As one embodiment, the low power consumption control part is connected with an infrared sensor, and the low power consumption control part and the infrared sensor are respectively connected with the battery assembly. The infrared sensor is used for detecting the movement condition of nearby people, such as detecting whether people move in a kitchen or whether people do not exist for a long time, and the detection data of the infrared sensor is sent to the low-power consumption control part and used for assisting in judging whether the current gas flow in the pipeline is normal.
As one embodiment, the permanent magnet is arranged on any blade of the gas impeller, and the induction coil is positioned in the rotation plane of the permanent magnet and is in a facing state with the permanent magnet at least one rotation position. The permanent magnet is used for generating an alternating magnetic field when rotating, so that an induction coil opposite to the permanent magnet can generate an electric signal; therefore, the induction coil is only required to be positioned in the magnetic field range of the permanent magnet and can be in a facing state with the permanent magnet at least one rotating position, when the permanent magnet rotates to the at least one rotating position, the permanent magnet and the induction coil are in the facing state, so that the induction coil generates weak electric signals, and the electric signals can wake up the low-power consumption control part to monitor the gas flow after rectification.
Example 1
As shown in fig. 1, the embodiment provides a household natural gas leakage automatic detection protection system, which comprises a bistable gas valve, a gas impeller, a permanent magnet, an induction coil, a rectifying circuit, a low-power consumption MCU, an infrared sensor and a battery; the opening and closing end of the bistable air valve is positioned in the pipeline and positioned at the air inlet side of the gas impeller; the permanent magnet is arranged on one blade of the gas impeller, and the induction coil is arranged outside the pipeline and above the gas impeller; one end of the induction coil is connected with a rectifying diode, and the other end of the rectifying diode is connected with an energy storage capacitor; the induction coil is connected in parallel with an energy storage capacitor, the energy storage capacitor is very small, and one end of the energy storage capacitor is connected with a wake-up port of the low-power MCU; the low-power consumption MCU is connected with the bistable air valve and used for controlling the switch of the air valve; the low-power consumption MCU is connected with the infrared sensor to receive the environmental data detected by the infrared sensor; the low-power consumption MCU and the infrared sensor are connected with the battery, and the battery supplies power after the low-power consumption MCU is awakened.
In particular, the blades of the gas impeller are arranged vertically, and the induction coil is located above or below the gas impeller. The gas impeller is vertically arranged in the pipeline, and when gas flows in the pipeline, the gas impeller rotates on a vertical plane to drive the permanent magnet to rotate on the vertical plane; the induction coil is arranged above or below the gas impeller and is positioned on the rotating plane of the permanent magnet, so that at least one rotating position of the permanent magnet can be opposite to the induction coil when the permanent magnet rotates, namely, the induction coil is positioned right above or right below the induction coil.
The working principle of the embodiment is as follows: the bistable air valve is in an open state at ordinary times, when air is used, air flows in the pipe, the air flow drives the air impeller to rotate, the air impeller rotates to drive the permanent magnet on the blade to rotate, when the permanent magnet rotates to the position right below the induction coil and is opposite to the induction coil, a weak electric signal is generated at two ends of the induction coil, the electric signal is rectified by the rectifier diode, energy is accumulated at two ends of the energy storage capacitor, when the energy is accumulated to a certain degree, the low-power consumption control part is awakened, the low-power consumption control part is used for measuring the air flow after being awakened, the air consumption condition in the pipeline is monitored, the air impeller emits a pulse every time, meanwhile, the infrared sensor detects the character movement condition in the target area, the low-power consumption MCU judges whether the air consumption is normal or not according to the current air consumption condition and character movement information, if the air consumption is abnormal, the air valve is triggered to act to close the air valve, and then the air valve enters a dormant state until the air consumption is awakened again.
Example 2
Unlike embodiment 1, in this embodiment, the blades of the gas impeller are arranged horizontally, and the induction coil is located at a position perpendicular to the direction of the gas flow on the horizontal plane. The gas impeller is horizontally arranged in the pipeline, and when gas flows in the pipeline, the gas impeller rotates on a horizontal plane to drive the permanent magnet to rotate on the horizontal plane; the induction coil is arranged on the side face of the gas impeller and is positioned on the rotating plane of the permanent magnet, so that at least one rotating position opposite to the induction coil can be ensured when the permanent magnet rotates. Further, for a pipe which is horizontally arranged and extends in the left-right direction, the gas impeller is also horizontally arranged in the pipe, and the induction coil is arranged in front of or behind the gas impeller and the permanent magnet which fills at least one rotation position is opposite to the induction coil.
Example 3
The embodiment provides a household natural gas leakage automatic detection protection method, which comprises the following steps: when gas flows in the pipeline, the gas impeller is driven to rotate by the gas flow, the permanent magnet on the gas impeller is driven to rotate, an alternating magnetic field is generated, the induction coil generates an alternating electric signal, and the alternating electric signal wakes up the low-power consumption control part after rectification; the low-power consumption control part performs gas flow measurement and simultaneously judges whether the gas consumption is normal according to the movement condition of nearby people; if not, triggering the bistable air valve to act to close the air valve.
The low-power consumption control part is in a dormant state at ordinary times, is powered by a battery to monitor gas consumption and detect environment after being awakened, triggers a valve to act to close a gas valve when judging that the gas consumption is abnormal, then enters the dormant state until being awakened again, and the method monitors the gas flow in the pipeline directly and keeps the dormant state when no abnormal condition exists, thereby not only meeting the requirements of accuracy and safety of automatic detection and protection of household natural gas leakage, but also having the advantages of low power consumption and strong practicability and meeting the requirements of the masses on household safety equipment.
As an embodiment, the method further comprises: when the low power consumption control part detects that the gas flow in the pipeline is abnormal, or detects that no person nearby moves for more than a preset time, or detects that gas flows in abnormal time, the bistable gas valve is actively triggered to close the gas valve. The low-power consumption control part has a flow metering function, receives character movement data detected by the infrared sensor, and comprehensively judges whether other flow in the current pipeline is abnormal or not by combining the current air flow and the character movement data in the current area. Or, the range of the person moving time in the target area is preset, when the person moving is not detected in the preset time, namely, whether the person is using gas in the target area is judged, if the gas in the pipeline flows at the moment, the natural gas leakage can be judged, and the valve is triggered to be closed automatically. Or presetting an abnormal time range, and when the gas flow in the pipeline is detected in the abnormal time range and the movement of the person in the target area is not detected, judging that the natural gas leakage occurs in the target area and triggering the automatic relation of the valves.
In the description of the present specification, reference to the terms "one embodiment," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; these modifications or substitutions do not depart from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.
Claims (7)
1. The household natural gas leakage automatic detection protection system is characterized by comprising a bistable gas valve, a low-power consumption control part and an airflow triggering part, wherein the bistable gas valve and the airflow triggering part are respectively connected with the low-power consumption control part; the air flow triggering part comprises an air impeller arranged in the pipeline, a permanent magnet and an induction coil arranged outside the pipeline, wherein the permanent magnet is arranged on a blade of the air impeller, and the induction coil is arranged in the magnetic field range of the permanent magnet; the opening and closing ends of the bistable air valve are positioned in the pipeline and positioned on the air inlet side of the gas impeller; the low-power consumption control part is arranged outside the pipeline; the bistable air valve is in an open state at ordinary times, when the air is used, air flows in the pipe to drive the air impeller to rotate, the air impeller rotates to drive the permanent magnets on the blades to rotate, when the permanent magnets rotate to be opposite to the induction coil, a weak electric signal is generated at two ends of the induction coil, the electric signal is sent to a wake-up port of the low-power consumption control part after being rectified, the low-power consumption control part is waken up, and after the low-power consumption control part is waken up, the battery is used for supplying power; the low-power consumption control part is used for measuring the gas flow after being awakened, monitoring the gas consumption condition in the pipeline, sending a pulse every turn of the gas impeller, detecting the environment, judging whether the gas consumption is normal or not by combining the current gas consumption condition and the environment information, triggering the gas valve to act to close the gas valve if the gas consumption is abnormal, and then entering a dormant state until being awakened again;
the protection method realized on the basis of the household natural gas leakage automatic detection protection system is included, and comprises the following steps:
when gas flows in the pipeline, the gas impeller is driven to rotate by the gas flow, the permanent magnet on the gas impeller is driven to rotate, an alternating magnetic field is generated, the induction coil generates an alternating electric signal, and the alternating electric signal wakes up the low-power consumption control part after rectification;
the low-power consumption control part performs gas flow measurement and simultaneously judges whether the gas consumption is normal according to the movement condition of nearby people; if not, triggering the bistable air valve to act to close the air valve.
2. The automatic detection and protection system for household natural gas leakage according to claim 1, wherein the induction coil is connected with a rectifying circuit for rectifying an alternating electric signal generated by the induction coil into a direct current pulse signal; the output end of the rectifying circuit is connected with the low-power-consumption control part and is used for inputting a direct-current pulse signal into the low-power-consumption control part to wake up the low-power-consumption control function.
3. The automatic detection and protection system for natural gas leakage in home as claimed in claim 1 or 2, wherein the low power consumption control part is connected with an infrared sensor, and the low power consumption control part and the infrared sensor are respectively connected with the battery assembly.
4. The automatic detection and protection system for household natural gas leakage according to claim 1, wherein the permanent magnet is disposed on any one of the blades of the gas impeller, and the induction coil is located in a rotation plane of the permanent magnet and is in a facing state with the permanent magnet in at least one rotation position.
5. The automatic home gas leakage detection and protection system according to claim 4, wherein the blades of the gas impeller are arranged vertically and the induction coil is located above or below the gas impeller.
6. The automatic home gas leakage detection and protection system according to claim 4, wherein the blades of the gas impeller are horizontally arranged, and the induction coil is positioned at a position perpendicular to the direction of the gas flow on a horizontal plane.
7. The home natural gas leak automatic detection and prevention system of claim 1, wherein the method further comprises: when the low power consumption control part detects that the gas flow in the pipeline is abnormal, or detects that no person nearby moves for more than a preset time, or detects that gas flows in abnormal time, the bistable gas valve is actively triggered to close the gas valve.
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