Fuel gas active safety system with infrasonic wave turbulent flow

Abstract

The invention relates to the technical field of fuel gas. A gas active safety system with infrasonic wave turbulent flow comprises an electric control gas valve arranged on a gas pipeline and a microprocessor system. The electric control air valve is provided with a control signal input end, and a control output port of the microprocessor system is controllably connected with the control signal input end of the electric control air valve; the device further comprises a fuel gas concentration sensor system with infrasonic wave turbulent flow, the fuel gas concentration sensor system comprises an electromagnet, an electromagnetic movable part of the electromagnet is connected with a vibrating membrane, and an electromagnetic induction coil driving electromagnetic movable part with an infrasonic wave oscillating circuit driving electromagnet is connected with a vibrating membrane. And the vibration membrane promotes the airflow to flow through the fuel gas concentration sensor assembly, so that the sensitivity is improved, the reaction is quicker, and the fuel gas active safety system can make a quicker response under the condition that the concentration of the gas to be detected is lower.

Description

Technical Field

[0001] The present application relates to the field of gas technology, in particular to gas safety. Background Art

[0002] The microprocessor control system combined with the gas concentration sensor detects gas leaks and then takes active measures to close the gas pipeline, which is a commonly used technical solution for the current gas active safety system.

[0003] Existing conventional gas concentration sensors have the characteristics of simple structure, low cost and stable operation. In order to meet the design requirements of simplicity, low cost and stable operation, the natural diffusion of gas is widely used for sensing. That is to say, the gas must diffuse naturally to the gas concentration sensor to output the sensing data of the gas concentration. This causes the problem of slow response speed and low sensitivity of the sensor.

[0004] When the sensor has problems such as slow response speed and low sensitivity, the gas concentration at the gas leakage point will often exceed the safe value range when the sensor transmits the sensing data, which can easily cause a gas safety accident. Summary of the invention

[0005] The object of the present invention is to provide a gas active safety system with infrasonic turbulence to solve at least one of the above technical problems.

[0006] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0007] The active gas safety system with infrasonic disturbance includes an electric-controlled gas valve arranged on a gas pipeline and a microprocessor system; the electric-controlled gas valve has a control signal input end for controlling the opening and closing of the valve, and the control output port of the microprocessor system can be controllably connected to the control signal input end of the electric-controlled gas valve;

[0008] Also included is a gas concentration sensor system with infrasonic turbulence;

[0009] The gas concentration sensor system includes a gas concentration sensor assembly for sensing gas concentration, and a vibrating airflow driving device, the vibrating airflow driving device includes an electromagnet, the electromagnet includes an electromagnetically driven movable part, the power of the electromagnetic drive is controllable and adjustable, and the movable part is connected to a vibration membrane;

[0010] The vibration type airflow driving device also includes a subsonic wave oscillation circuit, and the subsonic wave oscillation circuit is selected as a subsonic wave oscillation circuit capable of controllably changing the oscillation frequency;

[0011] A microprocessor system controls and connects the infrasonic oscillation circuit;

[0012] The infrasonic oscillation circuit drives the connected electromagnet, and the electromagnetically driven moving parts make reciprocating motion, thereby driving the vibration membrane to disturb the flow, and the gas flows in the direction toward the gas concentration sensor assembly;

[0013] The gas concentration sensor system has a gas concentration output interface, and the gas concentration output interface is connected to the signal input port of the microprocessor system;

[0014] A microprocessor system is associated with a speaker;

[0015] Also included is a control software system running in the microprocessor system, wherein the control software system is preset with a first reference value and a second reference value, and the first reference value is smaller than the second reference value;

[0016] The control software system also includes a timing program, and the timing program is set with a set duration;

[0017] When the gas concentration value received by the control software system is greater than the first reference value and less than the second reference value, the timing program will be started, and a warning tone will be issued through the associated speaker. The control software system controls the infrasonic oscillation circuit through the microprocessor system, controls to enhance the power of the electromagnetic drive of the electromagnet, and increases the oscillation frequency of the infrasonic oscillation circuit;

[0018] During the operation of the timing program, if the gas concentration value received by the control software system is less than the first reference value, the timing program is closed, and the electromagnetic driving power and the oscillation frequency of the infrasonic oscillation circuit are restored;

[0019] After the timing program runs to the set time, the electric control gas valve is controlled to close;

[0020] The gas concentration value received by the control software system is greater than the second reference value, and the electric-controlled gas valve is directly controlled to be closed.

[0021] In the above design, a gas concentration sensor system with infrasonic turbulence is provided. The gas concentration sensor system has a vibrating airflow driving device. The vibrating airflow driving device includes an electromagnet. The electromagnet includes an electromagnetic induction coil and a movable part driven by the electromagnetic induction coil. The electromagnetic induction coil is driven by an infrasonic oscillation circuit. The movable part is connected to a vibrating membrane. The turbulence of the vibrating membrane promotes gas flow. On the one hand, more airflow is allowed to flow through the gas sensor assembly, thereby improving the detection sensitivity of the gas sensor assembly. On the other hand, since it is no longer the traditional natural diffusion of gas, but driving the gas flow, the external gas can flow to the gas sensor assembly more quickly, thereby making the reaction faster.

[0022] When the microprocessor system obtains the gas concentration value sent by the gas concentration sensor system, the control software system performs logical judgment according to the preset gas concentration threshold.

[0023] When the gas concentration value exceeds the first reference value, the control software system controls the infrasonic oscillation circuit through the microprocessor system, controls to enhance the power of the electromagnetic drive of the electromagnet, and increases the oscillation frequency of the infrasonic oscillation circuit, so as to drive the gas to flow faster, provide more air flow for the gas concentration sensor system, further improve the detection sensitivity of the gas sensor component, and make more accurate safety protection measures.

[0024] Furthermore, the microprocessor system is also associated with a control signal input device, and after receiving a valid signal, the control signal input device triggers the microprocessor system to control the electric-controlled gas valve to open.

[0025] In the above design, the beneficial effect of setting up the control signal input device is that when the gas active safety system controls the closing of the electric-controlled gas valve, a technical solution is provided to release the closed state of the electric-controlled gas valve.

[0026] Furthermore, the control signal input device is a manual switch having an output electrical signal.

[0027] In the above design, the control signal input device adopts a manual switch. After the user presses the manual switch, the manual switch outputs an electrical signal to the microprocessor system. After receiving the electrical signal, the microprocessor system releases the control of the electric control gas valve through the control output interface and restores the opening of the electric control gas valve. This process is also called the reset operation.

[0028] Furthermore, the control signal input device includes a microphone; the microphone signal is connected to a voice recognition system, which can be a hardware system or a software system; when the voice recognition system recognizes a specific voice, it outputs a switch signal.

[0029] In the above design, the control signal input device also includes a microphone connected to the voice recognition system, which further enriches the interactive capability of the gas active safety system with infrasonic turbulence. The voice recognition system obtains external voice through the microphone. If the set voice is captured and recognized by the voice recognition system, the voice recognition system will send the coded signal of the set voice to the voice recognition signal input interface of the microprocessor system. The microprocessor system can determine what set voice is received based on the coded signal sent by the voice recognition signal, and then execute the operation instruction associated with the set voice. The set voice can be set to voices similar to the following:

[0030] 1. Mute: turn off the warning sound during the execution of the timing program;

[0031] 2. Tip: Enable the warning tone during the execution of the timing program;

[0032] 3. Close: Without waiting for the timing program to reach the time, directly command the microprocessor system to close the electronically controlled gas valve;

[0033] 4. Open: command the microprocessor system to open the electronically controlled gas valve.

[0034] The microphone adopts a condenser microphone, which has high sensitivity and can capture delicate, high-frequency sounds. In the application scenario of the present invention, it can capture subtle human voices, which has the beneficial effect of improving the user's application experience.

[0035] Furthermore, the microprocessor system is also associated with a wireless communication module, which is a module for wirelessly connecting to a mobile network and is used for the microprocessor system to send messages to the mobile network;

[0036] The message sent can be either a gas concentration value or a warning message;

[0037] The microprocessor system can also receive instructions from the wireless communication module, and the received instructions include closing the electric-controlled gas valve and opening the electric-controlled gas valve.

[0038] In the above design, a full-duplex serial port is used to connect the wireless communication module and the microprocessor of the microprocessor system. The microprocessor system interacts with the wireless communication module through AT commands, and then sends the gas concentration value information or warning prompt information to the network server through the wireless communication module. The mobile phone APP interacts with the network server and can instantly obtain the gas usage information sent by the microprocessor system.

[0039] The mobile phone APP can also send instructions to the microprocessor system through the wireless communication module to remotely close the electric-controlled gas valve or remotely open the electric-controlled gas valve.

[0040] This design realizes human-computer interaction between the microprocessor system and the mobile phone APP through a wireless communication module, helping people related to gas safety to promptly learn about the gas concentration detection situation, and also helping people related to gas safety to perform remote control.

[0041] Furthermore, the gas sensor assembly is arranged in front of the airflow output direction of the vibration type airflow driving device, and a baffle for blocking the airflow is arranged in front of the gas sensor assembly;

[0042] The gas sensor assembly is located between the vibration-type airflow driving device and the baffle;

[0043] The side surface of the gas sensor assembly is not blocked by the vibrating airflow driving device and the baffle, and the unblocked side surface area accounts for more than one half of the entire side surface area.

[0044] In the above design, the baffle can make the airflow driven by the vibrating airflow driving device rebound and stagnate after passing through the gas sensor assembly, thereby increasing the airflow volume. In addition, the existence of the baffle also provides a basis for increasing the gas pressure at the gas sensor assembly, which is conducive to further improving the sensitivity and shortening the reaction time.

[0045] The side of the gas sensor assembly is not blocked by the vibrating airflow driving device and the baffle, and its function is to facilitate airflows in other directions to diffuse or penetrate into the gas sensor assembly, while also providing a source for the airflow driven by the vibrating airflow driving device.

[0046] Furthermore, the distance between the vibrating airflow driving device and the gas concentration sensor assembly is less than 5 cm.

[0047] The beneficial effect is that a stronger airflow is generated to the gas sensor assembly.

[0048] Furthermore, the oscillation circuit is selected to have an oscillation frequency greater than 0.5 Hz and less than 15 Hz.

[0049] The beneficial effect is that the vibration in this frequency band facilitates a longer rebound time for the vibrating membrane, makes it easier to resonate, and generates stronger airflow.

[0050] The active safety control method of gas with infrasonic disturbance is applicable to the active safety system of gas with infrasonic disturbance, and the control software system performs the following steps:

[0051] S100, obtaining a gas concentration value, comparing it with a first reference value, and if it is less than the first reference value, and the current timing program is running, then executing: closing the timing program; restoring the electromagnetic driving power; restoring the oscillation frequency of the infrasonic oscillation circuit;

[0052] S110, the gas concentration value is compared with the second reference value. If it is greater than the second reference value, the following steps are executed: controlling the electric control gas valve to close;

[0053] S120, if the gas concentration is between the first reference value and the second reference value, and the timing program is not started, then the following steps are performed: starting the timing program, setting the timing duration of the timing program to n; enhancing the electromagnetic driving power of the electromagnet through the microprocessor system control, and increasing the oscillation frequency of the infrasonic oscillation circuit;

[0054] S130: If the timing is not reached, return to step S100;

[0055] S140, when the timing is reached, execute: control to close the electric-controlled gas valve.

[0056] In the control method, the gas concentration sensor system outputs a gas concentration signal to the microprocessor system to trigger the logic control.

[0057] After the microprocessor system receives the gas concentration value, the control software system performs logic processing and adjusts or controls the gas concentration sensor system and the electronically controlled gas valve through the microprocessor system.

[0058] When the gas concentration value is lower than the first reference value, if the timing program is already running, the timing program is closed.

[0059] When the gas concentration value is greater than the first reference value and less than the second reference value, it is determined whether the timing program is already running. If it is not running, the timing program is started and the infrasonic oscillation circuit is regulated by the microprocessor system. First, the power of the electromagnetic drive of the electromagnet is enhanced to make the moving parts drive the vibration membrane with greater force, so as to push more airflow through the gas sensor component; second, the oscillation frequency of the infrasonic oscillation circuit is increased, and its purpose is also to push more airflow through the gas sensor component. The beneficial effect of such adjustment is to improve the sensitivity of the gas sensor component and shorten the response time.

[0060] When the gas concentration value is greater than the second reference value, the control software system directly controls the electric control gas valve to close through the microprocessor system. Its function is to close the electric control gas valve to cut off the gas source when the gas concentration is too high, thereby preventing the loss of life and property caused by gas accidents.

[0061] For further optimization, the timing duration n of the timing program is set to 5 to 15 minutes.

[0062] The timing duration is set at 5 to 15 minutes, which is the optimal protection duration determined through multiple tests. If the time is too short, it is easy to cause false alarms, and if the time is too long, it will result in missing the effective protection opportunity.

[0063] The present invention sets a vibrating airflow driving device in the gas concentration sensor system. The vibrating airflow driving device includes an electromagnet, and the electromagnet includes an electromagnetic driving component and a movable component driven by the electromagnetic driving component. An oscillation circuit with an infrasonic vibration frequency drives the electromagnetic driving component, thereby driving the movable component to vibrate at the frequency of the infrasonic wave. The movable component is connected to a vibration membrane, and when the vibration membrane vibrates, a turbulent flow is generated, which prompts the gas to flow to the gas sensor component. The beneficial effect is that the gas concentration sensor can respond faster when the concentration of the gas to be measured is lower; after obtaining that the gas concentration reaches a certain concentration, the microprocessor system adjusts and increases the power of the electromagnetic driving component and the oscillation frequency of the oscillation circuit, further promoting more gas to flow through the gas concentration sensor component, thereby improving the sensitivity of the gas concentration sensor system and making more accurate safety protection measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0065] Figure 1 It is a control system structure diagram of the present invention;

[0066] Figure 2 It is a partial structural schematic diagram of a gas sensor with infrasonic turbulence of the present invention;

[0067] Figure 3 It is a structural schematic diagram of a vibrating airflow driving device of the present invention;

[0068] Figure 4 It is a schematic structural diagram of another vibration-type airflow driving device of the present invention;

[0069] Figure 5 It is a flow chart of the control method of the present invention.

[0070] Explanation of symbols:

[0071] 1. Gas sensor assembly; 2. Vibrating airflow driving device; 3. Airflow guide duct; 11. Baffle; 21. Fixing ring; 22. Vibrating membrane; 23. Gas one-way valve; 231. Movable membrane layer; 31. Air inlet; 32. Air outlet. DETAILED DESCRIPTION

[0072] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0073] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0074] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0075] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0076] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the active gas safety system with infrasonic turbulence includes an electric-controlled gas valve arranged on a gas pipeline, and a microprocessor system; the electric-controlled gas valve has a control signal input end for controlling the opening and closing of the valve, and the control output port of the microprocessor system can be controllably connected to the control signal input end of the electric-controlled gas valve;

[0077] Also included is a gas concentration sensor system with infrasonic turbulence;

[0078] The gas concentration sensor system includes a gas concentration sensor assembly for sensing gas concentration, and a vibrating airflow driving device 2, wherein the vibrating airflow driving device 2 includes an electromagnet, the electromagnet includes an electromagnetically driven movable part, the power of the electromagnetic drive is controllable and adjustable, and the movable part is connected to a vibration membrane 22;

[0079] The vibration type airflow driving device 2 also includes a subsonic wave oscillation circuit, and the subsonic wave oscillation circuit is selected as a subsonic wave oscillation circuit that can controllably change the oscillation frequency;

[0080] A microprocessor system controls and connects an infrasonic oscillation circuit;

[0081] The infrasonic oscillation circuit drives the electromagnet, and the electromagnetic driving component drives the movable component to make reciprocating motion, thereby driving the vibration membrane 22 to disturb the flow, and the gas flows in the direction toward the gas concentration sensor component;

[0082] The gas concentration sensor system has a gas concentration output interface, and the gas concentration output interface is connected to the signal input port of the microprocessor system;

[0083] A microprocessor system is associated with a speaker;

[0084] Also included is a control software system running in the microprocessor system, wherein the control software system is preset with a first reference value and a second reference value, and the first reference value is smaller than the second reference value;

[0085] The control software system also includes a timing program, and the timing program is set with a set duration;

[0086] When the gas concentration value received by the control software system is greater than the first reference value and less than the second reference value, the timing program will be started, and a warning tone will be issued through the associated speaker. The control software system controls the infrasonic oscillation circuit through the microprocessor system, controls to enhance the power of the electromagnetic drive of the electromagnet, and increases the oscillation frequency of the infrasonic oscillation circuit;

[0087] During the operation of the timing program, if the gas concentration value received by the control software system is less than the first reference value, the timing program is closed, and the electromagnetic driving power and the oscillation frequency of the infrasonic oscillation circuit are restored;

[0088] After the timing program runs to the set time, the electric control gas valve is controlled to close;

[0089] The gas concentration value received by the control software system is greater than the second reference value, and the electric-controlled gas valve is directly controlled to be closed.

[0090] In the present embodiment, a gas concentration sensor system with infrasonic turbulence is provided. The gas concentration sensor system has a vibrating airflow driving device 2. The vibrating airflow driving device 2 includes an electromagnet. The electromagnet includes an electromagnetic induction coil and a movable part driven by the electromagnetic induction coil. The electromagnetic induction coil is driven by an infrasonic oscillation circuit. The movable part is connected to a vibration membrane 22. The turbulence of the vibration membrane 22 promotes gas flow. On the one hand, more airflow is allowed to flow through the gas sensor assembly 1, thereby improving the detection sensitivity of the gas sensor assembly 1. On the other hand, since it is no longer the traditional natural diffusion of gas, but driving the gas flow, the external gas can flow to the gas sensor assembly 1 more quickly, thereby making the reaction more rapid.

[0091] When the microprocessor system obtains the gas concentration value sent by the gas concentration sensor system, the control software system performs logical judgment according to the preset gas concentration threshold.

[0092] The electromagnet part in the vibrating airflow driving device 2 first adopts a low-power mode to drive the vibration membrane 22 to disturb the flow, and the infrasonic oscillation circuit operates in a low frequency band of 0.5 to 5 Hz. In this mode, the airflow can be accelerated while saving energy.

[0093] When the gas concentration value exceeds the first reference value, the control software system controls the infrasonic oscillation circuit through the microprocessor system, controls to enhance the power of the electromagnetic drive of the electromagnet, and adjusts the oscillation frequency of the infrasonic oscillation circuit to operate in the high frequency band of 10 to 15 Hz, so as to drive the gas to flow faster, provide more air flow for the gas concentration sensor system, further improve the detection sensitivity of the gas sensor assembly 1, and make more accurate safety protection measures.

[0094] In this embodiment, the microprocessor adopts the MCS-51 single-chip microcomputer series. The MCS-51 single-chip microcomputer series is an integrated circuit chip that uses ultra-large-scale integrated circuit technology to integrate a central processing unit CPU with data processing capabilities, random access memory RAM, read-only memory ROM, multiple I / O ports and interrupt systems, timers / counters and other functions (which may also include display drive circuits, pulse width modulation circuits, analog multiplexers, A / D converters and other circuits) on a silicon chip to form a small and complete computer system. The MCS-51 single-chip microcomputer series is low-cost, stable and reliable, suitable for scenarios that do not require high-speed processors, and can meet the functional requirements of the gas active safety system for microprocessors.

[0095] In this embodiment, the speaker adopts a dynamic speaker, which has good electroacoustic performance, a firm structure, and low cost, and has a volume loud enough to serve as a reminder of gas use.

[0096] The gas sensor assembly 1 can be at least one of a harmful gas sensor, a combustible gas sensor, and the like. The harmful gas sensor assembly 1 can be at least one of a formaldehyde sensor, a carbon monoxide sensor, and a toxic gas sensor. The combustible gas sensor assembly 1 can be at least one of a methane sensor and an alcohol sensor.

[0097] More specifically, the combustible gas sensor may be at least one of a gas sensor, a liquefied gas sensor, a coal gas sensor, an acetylene sensor, and a hydrogen sensor.

[0098] This patent adopts a vibrating airflow driving device 2 to drive the airflow instead of driving it through a fan, which has the characteristics of high reliability, low cost, simple structure and high safety.

[0099] The fan design needs to be driven by an electric motor. The service life of the electric motor is much shorter than that of the vibration type airflow driving device 2. In particular, in an environment with oil, the rotating shaft of the electric motor is easily stuck by the oil, affecting the work. However, the vibration type airflow driving device 2 will not be affected by the oil. Therefore, it has the characteristics of high reliability.

[0100] The cost of the vibration type airflow driving device 2, such as a speaker structure, is lower than the cost of the motor. Moreover, the vibration type airflow driving device 2 is easier to install. Therefore, it has the characteristics of lower cost and simple structure.

[0101] More importantly, electric motors generally have phase-changing plates, so there is a possibility of generating electric sparks. For a gas sensor that is in an environment that may contain flammable gas, it would be very dangerous if it could generate electric sparks itself.

[0102] In addition, when the motor shaft is obstructed, such as oil stains or other obstacles, it will generate heat, which is also dangerous. However, the vibrating airflow driving device 2 does not have a phase change and will not generate heat due to obstacles. Therefore, it has extremely strong safety.

[0103] The vibrating airflow driving device 2 in the present patent comprises a fixing ring 21; a vibrating membrane 22 is an elastic vibrating membrane 22 fixed on the fixing ring 21; the electromagnet comprises an electromagnetic induction coil and a magnetic component; an oscillation circuit is connected to the electromagnetic induction coil; and one of the electromagnetic induction coil and the magnetic component is arranged on the vibrating membrane 22.

[0104] The fixing ring 21 is not necessarily a circular ring, but may be Figure 4 The fixing ring 21 may have a depth extension to form a cylindrical shape.

[0105] The oscillation circuit outputs current to drive the electromagnetic induction coil to generate a magnetic field. Under the action of the magnetic field, the electromagnetic induction coil and the magnetic component produce relative motion, thereby driving the vibration membrane 22 to vibrate.

[0106] Preferably, one of the electromagnetic induction coil and the magnetic component is disposed on the vibration membrane 22 and is located within the surrounding range of the fixing ring 21 to improve firmness and stability.

[0107] Embodiment 1:

[0108] A gas one-way valve 23 is disposed on the vibration membrane 22 of the vibration-type airflow driving device 2 ; the gas one-way valve 23 is the gas one-way valve 23 that conducts the airflow and is directed toward the gas sensor assembly 1 .

[0109] By arranging the gas one-way valve 23 on the vibrating airflow driving device 2 , the vibration of the vibrating airflow driving device 2 can generate more airflow flowing toward the gas sensor assembly 1 .

[0110] The gas sensor assembly 1 is arranged in front of the vibration membrane 22; the gas one-way valve 23 includes at least one through hole arranged on the vibration membrane 22, and an active membrane layer 231 arranged at the through hole.

[0111] In the above design, a gas check valve 23 is directly formed on the vibration membrane 22 of the vibration type airflow driving device 2. It has the characteristics of simple structure and low cost. It also has the characteristics of more sensitive operation and more reliable performance due to fewer components and less resistance.

[0112] Furthermore, the gas one-way valve 23 includes at least one through hole provided on the vibration membrane 22, and a flexible plastic film attached to the front of the through hole.

[0113] Further guarantee, low cost, higher sensitivity and reliable performance.

[0114] Embodiment 2:

[0115] Furthermore, an airflow guiding pipe 3 is provided; the airflow guiding pipe 3 has an air inlet 31 and an air outlet 32 ​​; the air outlet 32 ​​faces the gas sensor assembly 1 ; and the vibrating airflow driving device 2 is connected to the airflow guiding pipe 3 .

[0116] The airflow is concentrated through the airflow guide pipe 3, so that the vibration airflow driving device 2 can drive more airflow to flow through the gas sensor assembly 1, thereby improving sensitivity and response speed. The opening area of ​​the air inlet 31 of the airflow guide pipe 3 is larger than the opening area of ​​the air outlet 32, so that the airflow at the air outlet 32 ​​can flow to the gas sensor assembly 1 more concentratedly.

[0117] The width of the airflow guide duct 3 is greater than the height, and the air inlet 31 is a strip-shaped air inlet 31; the vibrating membrane 22 is a vibrating membrane 22 whose width is greater than the height. By flattening the structure, the overall thickness is reduced to avoid an increase in the overall volume of the device. Reduce the flow obstruction of the airflow from the gas direction to the gas sensor assembly 1 due to the increase in thickness. The end of the airflow guide duct 3 is a funnel-shaped structure, and the air outlet 32 ​​is located at the small mouth of the funnel-shaped structure. The funnel-shaped structure is used to reduce air resistance. Moreover, because of the funnel-shaped structure, the area or volume is not suddenly reduced at the air outlet 32, but is gradually reduced, so there is almost no obstruction to the gas flowing through the gas sensor assembly 1 from the side. Although it is more expensive than suddenly reducing the area or volume, it has a better sensing effect.

[0118] A gas one-way valve 23 is also provided between the air inlet 31 and the air outlet 32 ​​of the air flow guide duct 3 to further increase the air flow rate. The air inlet 31 and the air outlet 32 ​​can be arranged in front of the vibrating membrane 22; the air inlet 31 is provided with a gas one-way valve 23 with the air flow conducting direction toward the air flow guide duct 3. When the vibrating membrane 22 oscillates, air is taken in through the air inlet 31, and is not allowed to go out through the air inlet 31 as much as possible, thereby increasing the air flow rate of the air outlet 32.

[0119] Preferably, the vibration membrane 22 is blocked between the air inlet 31 and the air outlet 32 ​​of the air flow guide duct 3; the air inlet 31 is located behind the vibration membrane 22, and the air outlet 32 ​​is located in front of the vibration membrane 22; and the gas one-way valve 23 is arranged on the vibration membrane 22.

[0120] Furthermore, the air inlet 31 is provided with another airflow one-way valve, and the other airflow one-way valve is a one-way valve with the airflow conducting direction toward the air outlet 32 ​​.

[0121] The air intake is opened when the vibrating membrane 22 is pushed forward and closed when it is retracted, so that the inhaled airflow flows through the gas check valve 23 to prepare for being pushed to the air outlet 32. This design can provide a stronger air flow or air pressure for the gas sensor assembly 1. The air inlet 31 is provided with a filter layer to ensure the cleanliness of the airflow.

[0122] More preferably, the vibrating membrane 22 is arranged at the air inlet 31 of the air flow guiding pipe 3; the air outlet 32 ​​is located in front of the vibrating membrane 22; and the gas check valve 23 is arranged on the vibrating membrane 22. This design allows the air flow to flow through the vibrating membrane 22 without being restricted by the pipeline.

[0123] The gas sensor assembly 1 is fixed above the circuit board, and the vibration-type airflow driving device 2 is arranged on the side of the gas sensor assembly 1. This design facilitates circuit layout, reduces the thickness of the device, and does not block the airflow flowing into the gas sensor assembly 1 from other directions, further ensuring the sensing performance.

[0124] A gas one-way valve 23 is disposed on the vibration membrane 22 of the vibration-type airflow driving device 2 ; the gas one-way valve 23 is the gas one-way valve 23 that conducts the airflow and is directed toward the gas sensor assembly 1 .

[0125] By arranging the gas one-way valve 23 on the vibrating airflow driving device 2 , the vibration of the vibrating airflow driving device 2 can generate more airflow flowing toward the gas sensor assembly 1 .

[0126] The gas sensor assembly 1 is arranged in front of the vibration membrane 22; the gas one-way valve 23 includes at least one through hole arranged on the vibration membrane 22, and an active membrane layer 231 arranged in front of the through hole.

[0127] In the above design, a gas check valve 23 is directly formed on the vibration membrane 22 of the vibration type airflow driving device 2. It has the characteristics of simple structure and low cost. It also has the characteristics of more sensitive operation and more reliable performance due to fewer components and less resistance.

[0128] Furthermore, the gas one-way valve 23 includes at least one through hole arranged on the vibration membrane 22 and a flexible plastic film attached to the front of the through hole, thereby further ensuring low cost, higher sensitivity and reliable performance.

[0129] The microprocessor system is also associated with a control signal input device, which triggers the microprocessor system to control the electric-controlled gas valve to open after receiving a valid signal.

[0130] In this embodiment, the beneficial effect of providing a control signal input device is that, when the gas active safety system controls to close the electric-controlled gas valve, a technical solution for releasing the closed state of the electric-controlled gas valve is provided.

[0131] The control signal input device is a manual switch with an output electrical signal.

[0132] In this embodiment, the control signal input device adopts a manual switch. After the user presses the manual switch, the manual switch outputs an electrical signal to the microprocessor system. After receiving the electrical signal, the microprocessor system releases the control of the electric control gas valve through the control output interface and restores the opening of the electric control gas valve. This process is also called a reset operation.

[0133] The control signal input device includes a microphone; the microphone signal is connected to a voice recognition system, which can be a hardware system or a software system; when the voice recognition system recognizes a specific voice, it outputs a switch signal.

[0134] In this embodiment, the control signal input device also includes a microphone connected to a voice recognition system, which further enriches the interactive capability of the gas active safety system with infrasonic turbulence. The voice recognition system obtains external voice through the microphone. If the set voice is captured and recognized by the voice recognition system, the voice recognition system will send a coded signal of the set voice to the voice recognition signal input interface of the microprocessor system. The microprocessor system can determine what set voice is received based on the coded signal sent by the voice recognition signal, and then execute the operation instruction associated with the set voice. The set voice can be set to voices similar to the following:

[0135] 5. Mute: turn off the warning sound during the execution of the timing program;

[0136] 6. Tips: Enable the warning tone during the execution of the timing program;

[0137] 7. Close: Without waiting for the timing program to reach the time, directly command the microprocessor system to close the electronically controlled gas valve;

[0138] 8. Open: command the microprocessor system to open the electronically controlled gas valve.

[0139] In this embodiment, the microphone adopts a condenser microphone. The condenser microphone has high sensitivity and can capture delicate, high-frequency sounds. In the application scenario of the present invention, it can capture subtle human voices, which has the beneficial effect of improving the user's application experience.

[0140] In this embodiment, the voice to be recognized is preset in advance, so a one-time programmable voice chip WTN6 series is used, which has the beneficial effects of low cost and high operating stability.

[0141] The microprocessor system is also associated with a wireless communication module, which is a module for wirelessly connecting to a mobile network and is used for the microprocessor system to send messages to the mobile network;

[0142] The message sent can be either a gas concentration value or a warning message;

[0143] The microprocessor system can also receive instructions from the wireless communication module, and the received instructions include closing the electric-controlled gas valve and opening the electric-controlled gas valve.

[0144] In this embodiment, a full-duplex serial port connection is adopted between the wireless communication module and the microprocessor of the microprocessor system. The microprocessor system interacts with the wireless communication module through AT commands, and then sends the gas concentration value information or warning prompt information to the network server through the wireless communication module. The mobile phone APP interacts with the network server and can instantly obtain the gas usage information sent by the microprocessor system.

[0145] The mobile phone APP can also send instructions to the microprocessor system through the wireless communication module to remotely close the electric-controlled gas valve or remotely open the electric-controlled gas valve.

[0146] This embodiment realizes human-computer interaction between the microprocessor system and the mobile phone APP through a wireless communication module, which helps people related to gas safety to timely learn about the gas concentration detection situation, and also helps people related to gas safety to perform remote control.

[0147] In this embodiment, the wireless communication module uses the esp8266WiFi module. The esp8266WiFi module has low cost, high integration, and supports multiple network protocols. The microprocessor system can use the MQTT (Message Queuing Telemetry Transport) protocol to send gas usage information to the network server. The mobile phone obtains the message queue received on the network server through the mobile phone APP and displays the gas information on the mobile phone, thereby completing the information interaction between remote devices.

[0148] The gas sensor assembly 1 is arranged in front of the airflow output direction of the vibration type airflow driving device 2, and a baffle 11 for blocking the airflow is arranged in front of the gas sensor assembly 1;

[0149] The gas sensor assembly 1 is located between the vibration-type airflow driving device 2 and the baffle 11;

[0150] The side surface of the gas sensor assembly 1 is not blocked by the vibrating airflow driving device 2 and the baffle 11, and the unblocked side surface area accounts for more than one half of the entire side surface area.

[0151] The baffle 11 can make the airflow driven by the vibration airflow driving device 2 rebound and stagnate after passing through the gas sensor assembly 1, thereby increasing the airflow volume. In addition, the existence of the baffle 11 also provides a basis for increasing the gas pressure at the gas sensor assembly 1, which is conducive to further improving the sensitivity and shortening the reaction time.

[0152] The side of the gas sensor assembly 1 is not blocked by the vibrating airflow driving device 2 and the baffle 11. Its function is to facilitate airflows in other directions to diffuse or penetrate into the gas sensor assembly 1, and also to provide an outlet for the airflow driven by the vibrating airflow driving device 2.

[0153] The distance between the vibration type airflow driving device 2 and the gas concentration sensor assembly is less than 5 cm.

[0154] The beneficial effect thereof is that a stronger airflow is generated for the gas sensor assembly 1 .

[0155] Furthermore, the oscillation circuit is selected to have an oscillation frequency greater than 0.5 Hz and less than 15 Hz.

[0156] The oscillation circuit is selected to have an oscillation frequency lower than 20 Hz. This is to avoid emitting sounds that can be heard by human ears and to avoid noise pollution to humans. Furthermore, the oscillation circuit is preferably an oscillation circuit with an oscillation frequency greater than 0.5 Hz and less than 15 Hz. The vibration in this frequency band is convenient for the vibration membrane 22 to have a longer rebound time, and is more likely to resonate and generate a stronger airflow.

[0157] Reference Figure 5 As shown, the active safety control method for gas with infrasonic disturbance is applicable to the active safety system for gas with infrasonic disturbance, and the control software system performs the following steps:

[0158] S100, obtaining a gas concentration value, comparing it with a first reference value, and if it is less than the first reference value, and the current timing program is running, then executing: closing the timing program; restoring the electromagnetic driving power; restoring the oscillation frequency of the infrasonic oscillation circuit;

[0159] S110, the gas concentration value is compared with the second reference value. If it is greater than the second reference value, the following steps are executed: controlling the electric control gas valve to close;

[0160] S120, if the gas concentration is between the first reference value and the second reference value, and the timing program is not started, then the following steps are performed: starting the timing program, setting the timing duration of the timing program to n; enhancing the electromagnetic driving power of the electromagnet through the microprocessor system control, and increasing the oscillation frequency of the infrasonic oscillation circuit;

[0161] S130: If the timing is not reached, return to step S100;

[0162] S140, when the timing is reached, execute: control to close the electric-controlled gas valve.

[0163] In the control method, the gas concentration sensor system outputs a gas concentration signal to the microprocessor system to trigger the logic control.

[0164] After the microprocessor system receives the gas concentration value, the control software system performs logic processing and adjusts or controls the gas concentration sensor system and the electronically controlled gas valve through the microprocessor system.

[0165] When the gas concentration value is lower than the first reference value, if the timing program is already running, the timing program is closed.

[0166] When the gas concentration value is greater than the first reference value and less than the second reference value, it is determined whether the timing program is already running. If it is not running, the timing program is started, and the subsonic oscillation circuit is regulated by the microprocessor system. First, the power of the electromagnetic drive of the electromagnet is enhanced, so that the movable part drives the vibration membrane 22 with greater force, so as to push more airflow through the gas sensor assembly 1; second, the oscillation frequency of the subsonic oscillation circuit is adjusted faster, and its purpose is also to push more airflow through the gas sensor assembly 1. The beneficial effect of such adjustment is to improve the sensitivity of the gas sensor assembly 1 and shorten the response time.

[0167] When the gas concentration value is greater than the second reference value, the control software system directly controls the electric control gas valve to close through the microprocessor system. Its function is to close the electric control gas valve to cut off the gas source when the gas concentration is too high, thereby preventing the loss of life and property caused by gas accidents.

[0168] For further optimization, the timing duration n of the timing program is set to 5 to 15 minutes.

[0169] The timing duration is set at 5 to 15 minutes, which is the optimal protection duration determined through multiple tests. If the time is too short, it is easy to cause false alarms, and if the time is too long, it will result in missing the effective protection opportunity.

[0170] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described, ie, those features that are not relevant to the best mode of the invention or those features that are not relevant to implementing the invention.

[0171] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0172] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A gas active safety system with infrasonic disturbance, comprising an electrically controlled gas valve arranged on a gas pipeline, and a microprocessor system; the electrically controlled gas valve has a control signal input end for controlling the opening and closing of the valve, and a control output port of the microprocessor system can be controllably connected to the control signal input end of the electrically controlled gas valve; characterized in that: Also included is a gas concentration sensor system with infrasonic turbulence; The gas concentration sensor system includes a gas concentration sensor assembly for sensing gas concentration, and a vibrating airflow driving device, the vibrating airflow driving device includes an electromagnet, the electromagnet includes an electromagnetically driven movable part, the power of the electromagnetic drive is controllable and adjustable, and the movable part is connected to a vibration membrane; The vibration type airflow driving device also includes a subsonic wave oscillation circuit, and the subsonic wave oscillation circuit is selected as a subsonic wave oscillation circuit capable of controllably changing the oscillation frequency; A microprocessor system controls and connects the infrasonic oscillation circuit; The infrasonic oscillation circuit drives the connected electromagnet, and the electromagnetic driving component drives the movable component to make reciprocating motion, thereby driving the vibration membrane to disturb the flow, and the gas flows in the direction toward the gas concentration sensor component; The gas concentration sensor system has a gas concentration output interface, and the gas concentration output interface is connected to the signal input port of the microprocessor system; A microprocessor system is associated with a speaker; Also included is a control software system running in the microprocessor system, wherein the control software system is preset with a first reference value and a second reference value, and the first reference value is smaller than the second reference value; The control software system also includes a timing program, and the timing program is set with a set duration; When the gas concentration value received by the control software system is greater than the first reference value and less than the second reference value, the timing program will be started, and a warning tone will be issued through the associated speaker. The control software system controls the infrasonic oscillation circuit through the microprocessor system, controls to enhance the power of the electromagnetic drive of the electromagnet, and increases the oscillation frequency of the infrasonic oscillation circuit; During the operation of the timing program, if the gas concentration value received by the control software system is less than the first reference value, the timing program is closed, and the electromagnetic driving power and the oscillation frequency of the infrasonic oscillation circuit are restored; After the timing program runs to the set time, the electric control gas valve is controlled to close; The gas concentration value received by the control software system is greater than the second reference value, and the electric-controlled gas valve is directly controlled to be closed.

2. The active gas safety system with infrasonic turbulence according to claim 1, characterized in that: The microprocessor system is also associated with a control signal input device, which triggers the microprocessor system to control the electric-controlled gas valve to open after receiving a valid signal.

3. The active gas safety system with infrasonic turbulence according to claim 2 is characterized in that: The control signal input device is a manual switch with an output electrical signal.

4. The active gas safety system with infrasonic turbulence according to claim 2, characterized in that: The control signal input device includes a microphone; The microphone signal is connected to a speech recognition system, and the speech recognition system may be a hardware system or a software system; When the speech recognition system recognizes a specific speech, it outputs a switch signal.

5. The active gas safety system with infrasonic turbulence according to claim 1, characterized in that: The microprocessor system is also associated with a wireless communication module, which is a module for wirelessly connecting to a mobile network and is used for the microprocessor system to send messages to the mobile network; The message sent can be either a gas concentration value or a warning message; The microprocessor system can also receive instructions from the wireless communication module, and the received instructions include closing the electric-controlled gas valve and opening the electric-controlled gas valve.

6. The active gas safety system with infrasonic turbulence according to claim 1, characterized in that: The gas sensor assembly is arranged in front of the airflow output direction of the vibration type airflow driving device, and a baffle for blocking the airflow is arranged in front of the gas sensor assembly; The gas sensor assembly is located between the vibration-type airflow driving device and the baffle; The side surface of the gas sensor assembly is not blocked by the vibrating airflow driving device and the baffle, and the unblocked side surface area accounts for more than one half of the entire side surface area.

7. The active gas safety system with infrasonic turbulence according to claim 1, characterized in that: The distance between the vibrating airflow driving device and the gas concentration sensor assembly is less than 5 cm.

8. The active gas safety system with infrasonic turbulence according to claim 1, characterized in that: The oscillation circuit is selected to be an infrasound oscillation circuit with an oscillation frequency greater than 0.5 Hz and less than 15 Hz.

9. A method for active safety control of gas with infrasonic disturbance, applicable to the active safety system of gas with infrasonic disturbance as claimed in any one of claims 1 to 8, characterized in that: The control software system performs the following steps: S100, obtaining a gas concentration value, comparing it with a first reference value, and if it is less than the first reference value, and the current timing program is running, then executing: closing the timing program; restoring the electromagnetic driving power; restoring the oscillation frequency of the infrasonic oscillation circuit; S110, the gas concentration value is compared with the second reference value. If it is greater than the second reference value, the following steps are executed: controlling the electric control gas valve to close; S120, if the gas concentration is between the first reference value and the second reference value, and the timing program is not started, then the following steps are performed: starting the timing program, setting the timing duration of the timing program to n; enhancing the electromagnetic driving power of the electromagnet through the microprocessor system control, and increasing the oscillation frequency of the infrasonic oscillation circuit; S130: If the timing is not reached, return to step S100; S140, when the timing is reached, execute: control to close the electric-controlled gas valve.

10. The method for active safety control of gas with infrasonic turbulence according to claim 9, characterized in that: The timing duration n of the timing program is set to 5 to 15 minutes.

Images