CN112856241A - Household natural gas leakage automatic detection and protection system and method - Google Patents
Household natural gas leakage automatic detection and protection system and method Download PDFInfo
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- CN112856241A CN112856241A CN202110048778.XA CN202110048778A CN112856241A CN 112856241 A CN112856241 A CN 112856241A CN 202110048778 A CN202110048778 A CN 202110048778A CN 112856241 A CN112856241 A CN 112856241A
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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 and protection system and a household natural gas leakage automatic detection and protection method, wherein the household natural gas leakage automatic detection and protection system comprises a bistable gas valve, a low-power consumption control part and a gas flow trigger part, wherein the bistable gas valve and the gas flow trigger part are respectively connected with the low-power consumption control part; the airflow triggering part comprises a gas impeller arranged in the pipeline, a permanent magnet and an induction coil arranged outside the pipeline, the permanent magnet is arranged on blades of the gas impeller, and the induction coil is arranged in the magnetic field range of the permanent magnet; the opening and closing end of the bistable gas valve is positioned in the pipeline and positioned on the gas inlet side of the gas impeller; the low-power consumption control part is arranged outside the pipeline. The invention realizes direct monitoring of airflow change in the pipeline, has accurate monitoring result and low energy consumption, can effectively realize automatic detection and protection of 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 and protection system and a household natural gas leakage automatic detection and protection method.
Background
With the development of industry in China, fuel gas becomes an indispensable energy source in life of people. More and more natural gas users, no matter young people or old people, often forget to close the valve, thereby causing 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 leaks or not is judged by measuring the gas concentration in the air, and the measurement sensitivity is poor; 2) most of the gas turbines are fixed in a specific gas system, and the universality is poor and the transportability is poor.
The relevant documents for preventing natural gas leakage through a relatively direct gas detection mode are found in the prior art, for example, China with publication number CN110307473A specially facilitates 2019, 10, 8, a household safe and leak-proof natural gas flow regulating device is disclosed, the device comprises an air supply pipeline and an air guide block penetrated by the air supply pipeline, an air conveying cavity with a right opening is arranged in the air guide block, the air conveying cavity and the air supply pipeline are communicated through a communicated pipeline, a flow regulating mechanism is arranged in the air conveying cavity, a cut-off mechanism is further arranged in the air supply pipeline, a transmission mechanism for judging whether gas is leaked or not when natural gas is not conveyed is arranged in the lower end wall of the air conveying cavity, and a driving mechanism for controlling the operation of the device is further arranged in the left end wall of the communicated pipeline. This patent application can be when closing the natural gas and carrying, and whether automatic judgement leaks gas, automatic shutoff gas pipeline when leaking gas prevents that the natural gas from revealing greatly to increase to cause danger, the alarm lamp lights simultaneously, and the suggestion is revealed, makes flow control automatic and transmission efficiency obtain improving through the transmission of machinery. For another example, chinese of publication No. CN204348035U dedicated to 2015, 5, 20 discloses an automatic safety detection device for leakage of household natural gas, wherein 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 to the conversion module, the key module, the coupling module and the display module, the power module is respectively connected to the main control module, the conversion module and the coupling module, the conversion module is respectively connected to a flow meter disposed in a natural gas pipeline and a thermocouple disposed at a flame combustion position of the natural gas cooker, the coupling module is connected to an electromagnetic valve disposed on the natural gas pipeline, the patent realizes detection and protection of leakage of gas from a household natural gas cooker or a liquefied gas cooker and pipeline, but the control circuit has many modules, and consumes much energy, which is not beneficial to practical application.
At present, there is no household natural gas detection system, which can automatically detect the change of the gas flow in the natural gas pipeline under the passive condition, excite the protection system to work and judge whether the natural gas is abnormal, so as to actively cut off the natural gas.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the household natural gas leakage automatic detection and protection system and the household natural gas leakage automatic detection and protection method, which can automatically detect the airflow change in the natural gas pipeline under the passive condition, excite the protection system to work and greatly improve the use safety of natural gas.
According to one aspect of the specification of the invention, a household natural gas leakage automatic detection and protection system is provided, which comprises a bistable gas valve, a low-power consumption control part and a gas flow triggering part, wherein the bistable gas valve and the gas flow triggering part are respectively connected with the low-power consumption control part; the airflow triggering part comprises a gas impeller arranged in the pipeline, a permanent magnet and an induction coil arranged outside the pipeline, the permanent magnet is arranged on blades of the gas impeller, and the induction coil is arranged in the magnetic field range of the permanent magnet; the opening and closing end of the bistable gas valve is positioned in the pipeline and positioned on the gas inlet side of the gas impeller; the low-power consumption control part is arranged outside the pipeline.
In the technical scheme, the bistable gas valve is in an open state at ordinary times, gas flows in the pipe when the gas is used, the gas impeller is driven to rotate, the gas 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 rectified and then sent to the awakening port of the low-power consumption control part, the low-power consumption control part is awakened, the low-power consumption control part is used as a gas flow meter after being awakened, the gas use condition in the pipeline is monitored (the gas impeller sends a pulse every turn), the environment is detected at the same time, whether the gas is normally used or not is judged by combining the current gas use condition and environment information, if the gas is abnormal, the gas valve is triggered to act to close the gas valve.
Above-mentioned technical scheme drives the permanent magnet pivoted mode through the interior airflow of gas pipeline and makes induction coil produce the signal of telecommunication, and then awakens up low-power consumption control part and carries out the gas flow meter through this signal of telecommunication to judge whether with gas normal, realized that the interior airflow of direct monitoring pipeline changes, monitoring result is accurate and the power consumption is few, can effectually realize the automated inspection protection that domestic natural gas leaked, is applicable to the family and uses, and the practicality is strong.
As a further technical scheme, the induction coil is connected with a rectifying circuit for rectifying an alternating current 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 used for inputting the direct-current pulse signal into the low-power-consumption control part to wake up the low-power-consumption control function. The rectifier circuit comprises an energy storage capacitor for storing energy to wake up the low power consumption control part. The energy storage capacitor is small, only a certain amount of energy needs to be gathered to wake up the low-power-consumption control part, and the low-power-consumption control part is powered by the battery after being awakened.
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 pack. The infrared sensor is used for detecting the moving condition of people nearby, such as detecting whether people move in a kitchen or whether no people exist for a long time, and the like, and the detection data of the infrared sensor is sent to the low-power-consumption control part and is used for assisting in judging whether the gas flow in the current pipeline is normal or not.
As a further technical scheme, the permanent magnet is arranged on any blade of the gas impeller, and the induction coil is positioned in a rotating plane of the permanent magnet and meets a state of facing the permanent magnet at least one rotating position. The permanent magnet has the function of generating an alternating magnetic field when rotating so that the 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 state of being aligned with the permanent magnet in 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 state of being aligned, so that the induction coil generates a weak electric signal, and the electric signal can wake up the low-power-consumption control part to monitor the gas flow after being rectified.
As a further technical solution, 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 a rotating plane of the permanent magnet, so that at least one rotating position of the permanent magnet is just opposite to the induction coil when the permanent magnet rotates, namely, the permanent magnet is positioned right above or below the induction coil.
As a further technical solution, the blades of the gas impeller are arranged horizontally, and the induction coil is located at a position perpendicular to the gas flow direction 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 of the permanent magnet is opposite to the induction coil when the permanent magnet rotates. Further, for a horizontally arranged pipeline extending in the left-right direction, the gas impeller is also horizontally arranged in the pipeline, and the permanent magnet of which the induction coil is arranged in front of or behind the gas impeller and at least one rotating position is directly opposite to the induction coil.
According to one aspect of the specification of the invention, a household natural gas leakage automatic detection and protection method is provided, and comprises the following steps:
when gas flows in the pipeline, the gas impeller is driven by the gas flow to rotate, 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 is rectified to awaken the low-power-consumption control part;
the low-power consumption control part measures the gas flow and judges whether the gas is normally used or not by combining the movement condition of people nearby;
if not, the bistable state gas valve is triggered to act to close the gas valve.
Among the above-mentioned technical scheme, bistable state air valve is in the open mode at ordinary times, intraductal gaseous flow when using gas, drive gas impeller and rotate, gas impeller rotates and drives the permanent magnet rotation on the blade, when the permanent magnet rotate to opposite with induction coil, produce a weak signal of telecommunication at induction coil's both ends, this signal of telecommunication sends to the awakening port of low-power consumption control part after the rectification, awaken up low-power consumption control part, low-power consumption control part is awakened the back and is used as the gas flow meter, monitor the gas use condition in the pipeline, people's removal condition near simultaneously detects, then it is normal to use gas to combine present gas use condition and near people's removal condition judgement, if it is unusual to use gas, trigger the air valve action and close the gas valve. The low-power consumption control part is in the dormant state at ordinary times, awaken the back and carry out gas monitoring and environment detection with the battery power supply, and trigger the valve action and close the gas valve when judging gas use anomaly, then get into the dormant state and awaken up again, this method directly monitors and keeps the dormant state when there is not the abnormal condition to the air current in the pipeline, both satisfied accuracy and the security demand that domestic natural gas leaked the automated inspection protection, have the advantage that low-power consumption and practicality are strong again, accord with masses to domestic safety device's demand.
As a further technical solution, 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 preset time, or detects that gas flows at 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 gas flow and the character movement data in the current area. Or, presetting the range of the movement time of the person in the target area, when the movement of the person is not detected in the preset time, judging that no person is currently using gas in the target area, and if gas flows in the pipeline at the moment, judging that the natural gas leaks, and triggering the valve to automatically close. 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 people 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 gas valve is in an open state at ordinary times, when gas is used, gas flows in the pipe to drive the gas impeller to rotate, the gas 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 and is sent to a wake-up port of the low-power-consumption control part after being rectified, the low-power-consumption control part is woken up to be used as gas flow metering, the gas use condition in the pipeline is monitored (the gas impeller sends a pulse every turn), meanwhile, the environment is detected, whether the gas is used normally or not is judged by combining the current gas use condition and environment information, if the gas is used abnormally, the gas valve is triggered to act to close the gas valve, and. According to the invention, the induction coil generates an electric signal in a manner that the permanent magnet is driven to rotate by the airflow in the gas pipeline, and the low-power consumption control part is awakened by the electric signal and gas flow metering is carried out, so that whether gas is normally used or not is judged, the change of the airflow 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, and the gas flow monitoring device is suitable for household use and has strong practicability.
(2) The low-power consumption control part is in a dormant state at ordinary times, the battery supplies power to monitor gas consumption and detect the environment after being awakened, the valve is triggered to act to close the gas valve when the abnormal gas consumption is judged, and then the gas valve enters the dormant state until being awakened again.
Drawings
Fig. 1 is a schematic structural diagram of a domestic natural gas leakage automatic detection and protection system according to an embodiment of the 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. a battery.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to 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", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
According to one aspect of the specification of the invention, a household natural gas leakage automatic detection and protection system is provided, which comprises a bistable gas valve, a low-power consumption control part and a gas flow triggering part, wherein the bistable gas valve and the gas flow triggering part are respectively connected with the low-power consumption control part; the airflow triggering part comprises a gas impeller arranged in the pipeline, a permanent magnet and an induction coil arranged outside the pipeline, the permanent magnet is arranged on blades of the gas impeller, and the induction coil is arranged in the magnetic field range of the permanent magnet; the opening and closing end of the bistable gas valve is positioned in the pipeline and positioned on the gas inlet side of the gas impeller; the low-power consumption control part is arranged outside the pipeline.
In one embodiment, the induction coil is connected with a rectifying circuit for rectifying the alternating current 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 used for inputting the direct-current pulse signal into the low-power-consumption control part to wake up the low-power-consumption control function. The rectifier circuit comprises an energy storage capacitor for storing energy to wake up the low power consumption control part. The energy storage capacitor is small, only a certain amount of energy needs to be gathered to wake up the low-power-consumption control part, and the low-power-consumption control part is powered by the battery after being awakened.
In one embodiment, the low-power control part is connected with an infrared sensor, and the low-power control part and the infrared sensor are respectively connected with the battery pack. The infrared sensor is used for detecting the moving condition of people nearby, such as detecting whether people move in a kitchen or whether no people exist for a long time, and the like, and the detection data of the infrared sensor is sent to the low-power-consumption control part and is used for assisting in judging whether the gas flow in the current pipeline is normal or not.
In one embodiment, the permanent magnet is disposed on any blade of the gas impeller, and the induction coil is located in a rotation plane of the permanent magnet and in a state of facing the permanent magnet in at least one rotation position. The permanent magnet has the function of generating an alternating magnetic field when rotating so that the 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 state of being aligned with the permanent magnet in 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 state of being aligned, so that the induction coil generates a weak electric signal, and the electric signal can wake up the low-power-consumption control part to monitor the gas flow after being rectified.
Example 1
As shown in fig. 1, the present embodiment provides a household natural gas leakage automatic detection and protection system, which includes a bistable gas valve, a gas impeller, a permanent magnet, an induction coil, a rectification circuit, a low power consumption MCU, an infrared sensor and a battery; the opening and closing end of the bistable gas valve is positioned in the pipeline and positioned on the gas 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 rectifier diode, and the other end of the rectifier diode is connected with the energy storage capacitor; the induction coil is connected with an energy storage capacitor in parallel, the energy storage capacitor is very small, and one end of the energy storage capacitor is connected to a wake-up port of the low-power-consumption MCU; the low-power consumption MCU is connected with the bistable state air valve and is used for controlling the opening and closing 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 both connected with the battery, and the battery supplies power to the low-power consumption MCU after the low-power consumption MCU is awakened.
Specifically, 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 a rotating plane of the permanent magnet, so that at least one rotating position of the permanent magnet is just opposite to the induction coil when the permanent magnet rotates, namely, the permanent magnet is positioned right above or below the induction coil.
The working principle of the embodiment is as follows: the bistable gas valve is in an open state at ordinary times, when gas is used, gas flows in the gas pipe, the gas impeller is driven by the gas flow to rotate, the gas impeller rotates to drive the permanent magnet on the blade to rotate, when the permanent magnet rotates to be 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 and then 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 as a gas flow meter after being awakened, the gas using condition in the pipeline is monitored, the gas impeller sends a pulse every turn, meanwhile, the infrared sensor detects the person moving condition in a target area, the low-power-consumption MCU judges whether the gas is used normally or not by combining the current gas using condition and the person moving information, and then enters a sleep state until 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 gas flow direction 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 of the permanent magnet is opposite to the induction coil when the permanent magnet rotates. Further, for a horizontally arranged pipeline extending in the left-right direction, the gas impeller is also horizontally arranged in the pipeline, and the permanent magnet of which the induction coil is arranged in front of or behind the gas impeller and at least one rotating position is directly opposite to the induction coil.
Example 3
The embodiment provides a household natural gas leakage automatic detection and protection method, which comprises the following steps: when gas flows in the pipeline, the gas impeller is driven by the gas flow to rotate, 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 is rectified to awaken the low-power-consumption control part; the low-power consumption control part measures the gas flow and judges whether the gas is normally used or not by combining the movement condition of people nearby; if not, the bistable state gas valve is triggered to act to close the gas valve.
The low-power consumption control part is in the dormant state at ordinary times, awaken the back and carry out gas monitoring and environment detection with the battery power supply, and trigger the valve action and close the gas valve when judging gas use anomaly, then get into the dormant state and awaken up again, this method directly monitors and keeps the dormant state when there is not the abnormal condition to the air current in the pipeline, both satisfied accuracy and the security demand that domestic natural gas leaked the automated inspection protection, have the advantage that low-power consumption and practicality are strong again, accord with masses to domestic safety device's demand.
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 preset time, or detects that gas flows at 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 gas flow and the character movement data in the current area. Or, presetting the range of the movement time of the person in the target area, when the movement of the person is not detected in the preset time, judging that no person is currently using gas in the target area, and if gas flows in the pipeline at the moment, judging that the natural gas leaks, and triggering the valve to automatically close. 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 people in the target area is not detected, judging that the natural gas leakage occurs in the target area and triggering the automatic valve relationship.
In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean 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 embodiment or example. 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 examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention.
Claims (8)
1. The household natural gas leakage automatic detection and protection system is characterized by comprising a bistable gas valve, a low-power consumption control part and a gas flow trigger part, wherein the bistable gas valve and the gas flow trigger part are respectively connected with the low-power consumption control part; the airflow triggering part comprises a gas impeller arranged in the pipeline, a permanent magnet and an induction coil arranged outside the pipeline, the permanent magnet is arranged on blades of the gas impeller, and the induction coil is arranged in the magnetic field range of the permanent magnet; the opening and closing end of the bistable gas valve is positioned in the pipeline and positioned on the gas inlet side of the gas impeller; the low-power consumption control part is arranged outside the pipeline.
2. The automatic detection and protection system for the household natural gas leakage according to claim 1, wherein the induction coil is connected with a rectification circuit for rectifying an alternating current 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 used for inputting the 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 the household natural gas leakage according to claim 1 or 2, characterized in that 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 pack.
4. The automatic detection and protection system for the household natural gas leakage as claimed in claim 1, wherein the permanent magnet is arranged on any blade of the gas impeller, and the induction coil is positioned in a rotation plane of the permanent magnet and meets a positive state with the permanent magnet in at least one rotation position.
5. The automatic detection and protection system for household natural gas leakage according to claim 4, wherein the blades of the gas impeller are vertically arranged, and the induction coil is positioned above or below the gas impeller.
6. The automatic detection and protection system for natural gas leakage in household as claimed in claim 4, wherein the blades of the gas impeller are horizontally arranged, and the induction coil is located at a position perpendicular to the gas flow direction on the horizontal plane.
7. The automatic detection and protection method for the household natural gas leakage is realized based on the detection and protection system of any one of claims 1 to 6, and is characterized by comprising the following steps:
when gas flows in the pipeline, the gas impeller is driven by the gas flow to rotate, 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 is rectified to awaken the low-power-consumption control part;
the low-power consumption control part measures the gas flow and judges whether the gas is normally used or not by combining the movement condition of people nearby;
if not, the bistable state gas valve is triggered to act to close the gas valve.
8. The automatic detection and protection method for household natural gas leakage according to claim 7, characterized by further comprising the following steps: 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 preset time, or detects that gas flows at abnormal time, the bistable gas valve is actively triggered to close the gas valve.
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