CN111306342A

CN111306342A - Intelligent gas safety valve and intelligent safety valve opening and closing method

Info

Publication number: CN111306342A
Application number: CN202010202203.4A
Authority: CN
Inventors: 刘红斌; 康逸; 熊仕杰; 钱广; 赵云霄; 张强
Original assignee: Chengdu Homesafe Technology Co ltd
Current assignee: Chengdu Homesafe Technology Co ltd
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2020-06-19

Abstract

The invention discloses an intelligent gas safety valve and an intelligent safety valve opening and closing method, and relates to the field of gas safety valves. Through the structure that changes the valve bracket of motor valve, set up the quick response mechanism of pressure change, and set up the temperature pressure sensor that admits air, give vent To anger temperature pressure sensor and ambient temperature pressure sensor, gather the temperature data Ti of inlet end respectively, pressure data Pi, the temperature data To of the end of giving vent To anger, pressure data Po, and the temperature data Te of gas pipeline external environment, pressure data Pe, monitor through the above-mentioned data when different states, can realize that the user opens the gas valve automatically when needing To use gas, the function of the automatic shutdown gas valve after the user finishes using, no longer need the switching of user manual operation gas valve, the condition of forgetting To close the valve after having stopped the user and finishing using takes place, the security of gas use has greatly improved, very big reduction the emergence of gas incident.

Description

Intelligent gas safety valve and intelligent safety valve opening and closing method

Technical Field

The invention relates to the field of gas safety valves, in particular to an intelligent gas safety valve and an intelligent safety valve opening and closing method.

Background

The gas safety valve plays a safety protection role in a gas system. Because the gas pressure of the gas pipeline entering the house is regulated to a certain pressure range by the pressure regulating device and then is delivered to the user, sometimes, when the gas pipeline of the user is under-pressure or over-pressure in a short time due to the abnormal work of the pressure regulating device, or the debugging and pressure regulation, or the pressure is under-pressure or over-pressure in a short time after gas is stopped, gas safety accidents are easily caused when the gas pipeline of the user is under-pressure or over-pressure; in addition, most of connections between the ball valve at the rear end of the gas meter and the gas meter are hoses or bellows, if the hoses are used, the service life of the hoses is short, and the hoses are easily damaged by external force such as mice, and the like, so that gas leakage of the pipelines is caused, and gas safety accidents occur.

In order to prevent the occurrence of gas safety accidents, a mechanical self-closing valve is designed. The existing mechanical self-closing valve can trigger the safety closing function only after the pressure difference of gas flowing through the valve reaches a sufficient threshold value. At a rated flow rate of 0.6m³For example, the self-closing valve of/h, the required leakage gas flow needs to reach 1.2m to reach the threshold value for judging leakage in the manner of closing triggered by differential pressure³About/h, i.e. when the leakage is 1.2m³Below/h, the mechanical self-closing valve does not close the valve for leakage protection.

However, most domestic gas leaks are tiny leaks, such as the hose being bitten by a mouse and the hose being loose at the interface due to aging, and these leaks are very tiny leaks at first. The existing mechanical gas self-closing valve and other products can not realize the detection of the tiny flow leakage at all, which is the biggest defect of the existing mechanical gas self-closing valve and other mechanical products. The mechanical self-closing valve has the natural defects of over-high threshold value, narrow range of covering leakage flow, low accuracy and many defects and omissions in the aspect of protection of indoor gas safety. Moreover, the mechanical self-closing valve cannot be networked to report the detection condition, and the gas management party cannot grasp the gas safety state of the affiliated district on line, so that the gas safety information collection and management are inconvenient. The gas safety management side often makes propaganda, hopes that the user is after using up the gas, initiatively closes the gas ball valve, initiatively opens the gas ball valve again during gas use, however, the overwhelming majority of users do not accomplish and close the ball valve initiatively after using up the gas.

Therefore, the user extremely hopes to have a device that can intelligent control gas relief valve switching, and when the user needs the culinary art, the gas relief valve automatic open valve gassing, and after the user culinary art was finished, the gas relief valve automatic shut-off no longer need the user initiative open-close valve, can effectually prevent the emergence of gas incident.

Disclosure of Invention

The invention aims to: the utility model provides an intelligent gas relief valve and intelligent switching relief valve's method, it is too high to have solved traditional gas relief valve threshold value, and it is very narrow to cover the leakage flow range, and the accuracy is very low, and the relatively poor scheduling problem of security performance to and traditional gas relief valve can not be when the user needs the culinary art, and the automatic valve-closing problem of gas relief valve is opened the gassing to the gas relief valve when the user cooks the end.

The technical scheme adopted by the invention is as follows:

an intelligent gas safety valve comprises a safety valve shell, wherein a closed safety valve cavity is arranged inside the safety valve shell, a cavity gas outlet and a cavity gas inlet are formed in the safety valve cavity, a motor valve is arranged in the safety valve cavity, a valve gas inlet and a valve gas outlet which are respectively communicated with the cavity gas outlet and the cavity gas inlet are formed in the motor valve, the motor valve further comprises a valve support, the bottom of the valve support is connected with the motor valve through a fastener, the top of the valve support is the valve gas inlet, a filter screen mechanism is integrally arranged at the top of the valve support, and a plurality of valve gas outlets are formed in the side wall of the valve support;

an ear-shaped structure extends from the outer wall of the valve bracket, an inlet air temperature and pressure sensor is arranged on one side of the ear-shaped structure facing the air inlet of the valve, and an outlet air temperature and pressure sensor is arranged on one side of the ear-shaped structure facing the air outlet of the valve; an environment temperature and pressure sensor is also arranged outside the safety valve shell;

the air outlet of the valve is triangular;

a pressure change quick response mechanism is also arranged in the safety valve cavity;

a core control panel is arranged in the safety valve shell and outside the safety valve cavity, and an MCU (microprogrammed control Unit) controller and a communication module are integrated on the core control panel; the device also comprises a key, an indicator light and a power supply module; and the air inlet temperature and pressure sensor, the air outlet temperature and pressure sensor, the environment temperature and pressure sensor, the motor valve, the key, the indicator lamp, the power supply module and the pressure change quick response mechanism are all electrically connected with the core control panel.

Compared with a dustproof filter screen sheet which is arranged on the traditional valve support in a split mode, the valve support is convenient to manufacture and install accessories, and the filter screen mechanism is structurally adjusted, so that the whole device has more functions.

According to the invention, the ear-shaped structure is arranged on the outer wall of the valve bracket in an extending manner, the air inlet temperature and pressure sensor is arranged on one side of the ear-shaped structure facing the air inlet of the valve, and the air outlet temperature and pressure sensor is arranged on one side of the ear-shaped structure facing the air outlet of the valve, so that the sensor is convenient to install, the overall cost of a product is reduced, and the assembly efficiency is improved. The traditional motor valve does not have an intelligent function because a sensor is not arranged, so that a valve bracket does not have a position specially used for arranging the sensor; if a sensor is arranged on the traditional motor valve, a complex sealing joint is required to be arranged in the direction of the air inlet of the valve, and a sealing cover of the air inlet of the valve is added, so that the cost is increased, and the convenience of assembly is reduced.

According to the invention, the air outlet of the valve is arranged to be triangular, so that the changed flow area is nonlinearly changed in the process of gradually closing the air outlet of the valve. The misjudgment can be avoided when the current state of the user is the fire-off state or the small fire cooking state.

The air inlet temperature pressure sensor, the air outlet temperature pressure sensor and the environment temperature pressure sensor can respectively acquire temperature data Ti and pressure data Pi of an air inlet end, temperature data To and pressure data Po of an air outlet end, and temperature data Te and pressure data Pe of the external environment of a gas pipeline, so that the overpressure, underpressure and overtemperature conditions of the pipeline can be judged by using the data, and the specific conditions are as follows:

when the pressure difference value of Pi and Pe exceeds the upper limit value of the set pressure, the pipeline is prompted to alarm for overpressure, and the valve is closed;

when the pressure difference value of Pi and Pe is lower than the lower limit value of the set pressure, prompting pipeline under-pressure alarm, and closing the valve;

when any one of the three temperature values of Te, Ti and To is higher than the set upper limit temperature value, an overtemperature alarm is prompted, and the valve is closed.

According to the invention, the gas tiny leakage monitoring function can be realized by arranging the gas inlet temperature pressure sensor, the gas outlet temperature pressure sensor and the environment temperature pressure sensor. The principle is that after a gas valve is closed, the section of pipeline between the gas valve and a gas stove is in an absolute sealing state, pressure data Po inside the sealed pipeline is obtained in real time through a gas outlet temperature pressure sensor, and if the pipeline is in an absolute sealing state, Po does not have a descending trend and is always in a relatively stable pressure state; if there is some minor leakage in the pipe, Po will trend downward and fall to match the external ambient pressure data Pe within a certain time, assuming this time is T, i.e., when there is a leakage, Po will fall to coincide with Pe within time T. Specifically, the gas leakage grade is determined according to the size of T, the shorter the time of T is, the more serious the gas leakage is, the longer the time of T is, the weaker the gas leakage is, and if T is infinite, the leakage is not.

Meanwhile, in order to facilitate reasonable arrangement of personnel for troubleshooting of related departments on gas leakage accidents, n gas leakage grades can be divided, and the gas leakage grades can be adjusted according to actual conditions, so that serious leakage is preferentially treated, and safety accidents are avoided. For example: the gas leakage grade can be preliminarily divided into 4 grades, severe leakage is realized when T is less than or equal to 10 seconds, moderate leakage is realized when T is more than 10 seconds and less than or equal to 30 seconds, micro leakage is realized when T is more than 30 seconds and less than or equal to 300 seconds, and the normal state is indicated when T is more than 300 seconds.

The safety valve shell is also provided with a key outside, is electrically connected with the core control panel and is a manual trigger type key for a user; when pressing the button, the core control panel obtains low level signal, and when loosening the button, the core control panel obtains high level signal, and the key state this moment can be judged through different level signal to the core control panel, learns user's intention then, and convenience of customers directly opens the gas valve and closes switching among two operation options of gas valve through this button. Specifically, when the core control panel detects that the user presses this button, open the gas valve and close the switching among two operation options of gas valve by the core control panel, when switching to open the gas valve state from closing the gas valve state, the core control panel can judge whether current pipeline pressure state is in normal range automatically, safety information such as current gas leakage grade, only when pipeline pressure is in normal range and current gas pipeline does not leak, just carry out and open the gas valve operation to ensure user's gas safety.

When a user executes operation, the safety valve can indicate different information through the four indicator lamps according to the operation of the user and the working state of equipment, and the method comprises the following specific steps:

the blue indicator light flickers to indicate that the current gas valve is opened;

the green indicator light flickers to indicate that the current gas valve is closed;

the yellow indicator light flickers to indicate that the battery is low in electric quantity and needs to be replaced;

the red indicator light flickers, and the condition that the pipeline has abnormal gas leakage, under-pressure or over-pressure at the gas inlet is detected;

the four indicator lights flash together to indicate that the equipment is in failure.

Furthermore, the filter screen mechanism comprises a primary filter screen and a secondary filter screen, the primary filter screen is surrounded outside the secondary filter screen, and the secondary filter screen protrudes out of the surface of the primary filter screen and is closer to the air inlet of the cavity relative to the primary filter screen; all be equipped with a plurality of through-holes on one-level filter screen and the second grade filter screen.

Wherein, the sectional area of the through holes on the first-stage filter screen is smaller than that of the through holes on the second-stage filter screen.

The filter screen mechanism and the valve bracket are integrally designed, and compared with the regular through hole design on the traditional dustproof filter screen, the filter screen mechanism is divided into a primary filter screen part and a secondary filter screen part, the through hole on the primary filter screen is a small hole, the through hole on the secondary filter screen is a large hole, the through hole on the primary filter screen is firstly opened in the process of gradually opening the valve, the through hole on the secondary filter screen is in a closed state, and at the moment, a small part of gas is released to the rear end of the pipeline and pressure detection is carried out.

Furthermore, a first through groove is formed in the ear-shaped structure, a second through groove is formed in the safety valve cavity, sealing rubber plugs are arranged in the first through groove and the second through groove in an interference mode, and a plurality of wire passing holes are formed in the sealing rubber plugs; wherein a line between the air inlet temperature pressure sensor and the core control plate passes through a wire passing hole on the sealing rubber plug in the first through groove; and the circuits among the air outlet temperature and pressure sensor, the motor valve and the core control panel pass through the wire passing holes in the sealing rubber plugs in the second through grooves.

Wherein, first logical groove, second lead to groove and sealed rubber buffer and be the round platform form, and the tip cross-sectional diameter that first logical groove, second lead to the groove is less than sealed rubber buffer tip cross-sectional diameter.

The traditional motor valve is usually sealed by adopting a standard sealing connector, and has large volume and high cost. The invention is provided with a closed safety valve cavity, and only the second through groove is arranged on the safety valve cavity and the first through groove is arranged on the ear-shaped structure of the valve bracket for wiring. In order to prevent the gas from leaking from the first through groove and the second through groove, sealing rubber plugs are arranged at two positions, wire through holes are formed in the sealing rubber plugs, and the sealing rubber plugs are in interference connection with the first through groove and the second through groove. In actual installation, because sealing rubber stopper's volume slightly is greater than first logical groove, the second leads to the groove, so in two adjacent spare part assembling processes, can cause the extrusion to sealing rubber stopper, make it stabilize and imbed first logical groove, the second leads to the inslot, and the inner wall that first logical groove, second lead to the groove extrudees sealing rubber stopper simultaneously, sealing rubber stopper's deformation makes each gap all filled up, has finally realized sealed effect.

Furthermore, the pressure change quick response mechanism comprises a rubber sleeve and a central shaft arranged in the rubber sleeve, a spring is sleeved outside the central shaft, and magnets are embedded on two sides of the central shaft; the outer side of the rubber sleeve is opened, and the inner side of the rubber sleeve is sealed; the safety valve further comprises a first Hall sensor and a second Hall sensor which are arranged on the outer side of the rubber sleeve and the inner side of the rubber sleeve respectively and are away from the central shaft by a certain distance, the first Hall sensor is arranged on the outer side of the safety valve cavity, and the second Hall sensor is arranged on the inner side of the safety valve cavity.

The invention is provided with a pressure change quick response mechanism which is mainly used for improving the quick response to the pressure change. In the aforesaid through admit air temperature pressure sensor, the temperature pressure sensor of giving vent to anger and ambient temperature pressure sensor, judge pipeline superpressure, under-pressure, the overtemperature condition, rely on periodic sampling to judge, its judgement speed receives the influence of the length of adopting the cycle: the sampling period is long, and the response speed is slow; short sampling period, high power consumption and short battery life. The pressure quick corresponding mechanism can trigger quick detection when the pressure at the air outlet of the valve is suddenly reduced to the lowest pressure limit value due to the reasons of leakage and falling of an outlet pipeline, fire when a user opens a gas stove and the like; a sudden pressure increase beyond the maximum pressure limit can also trigger a rapid valve closure.

When an overpressure or underpressure condition occurs, the valve needs to be closed. When the valve is in a closed state, the air inlet of the valve is under-pressure or over-pressure, and the valve does not need to react immediately; when the valve is in an open state, the valve air inlet is communicated with the valve air outlet, the pressure of the valve air inlet is fed back to the pressure change quick response mechanism, response action is triggered, and quick valve closing under overpressure or underpressure is realized.

The principle of the pressure change quick response mechanism is as follows: when the pressure at the air outlet of the cavity is within a normal range, the pressure can push the central shaft to move towards the first Hall sensor, the central shaft is positioned between the first Hall sensor and the second Hall sensor, and at the moment, any one Hall sensor is not triggered, namely, the condition of overpressure or underpressure does not occur. When the under-pressure takes place, the spring promotes the center pin to second hall sensor's direction, and the magnet of this side is close to second hall sensor promptly for second hall sensor actuation magnet output low level, MCU controller production interrupt, so that make corresponding fast, confirm whether take place the pipeline damage or the user is carrying out the action of firing. When overpressure occurs, the rubber sleeve compresses to push the central shaft towards the first Hall sensor, and the displacement distance of the central shaft is large due to overlarge pressure, so that the magnet on the side of the central shaft attracts the first Hall sensor to trigger the MCU controller to rapidly close the valve.

The pressure change quick response mechanism is fixed on the cavity wall of the safety valve cavity by the fastener, a sealing mechanism is arranged between the fastener and the cavity wall, and the sealing mechanism comprises a sealing rubber sleeve and a sealing ring. The sealing rubber sleeve and the sealing ring can be arranged in a split mode or in an integrated mode.

Specifically, under the installation mode, the fastening piece comprises a fastening main body with threads and arranged on the outer side of the pressure quick corresponding mechanism, and a nut which is matched and fastened with the fastening main body, the pressure quick corresponding mechanism is fixed on the cavity wall of the safety valve cavity, and a sealing ring is arranged between the fastening piece and the cavity wall, so that the sealing is good.

The other installation mode of the pressure change quick response mechanism is that the pressure change quick response mechanism further comprises a hardware mechanism, wherein the hardware mechanism is arranged on the cavity wall of the safety valve cavity and is provided with a channel for accommodating a central shaft to pass through; the pressure change quick response mechanism is arranged on the outer wall of the valve support, the outer side of the rubber sleeve is abutted to the hardware mechanism, and a sealing ring is arranged between the rubber sleeve and the hardware mechanism.

Specifically, the outer wall of the valve support is provided with another bearing mechanism except the ear-shaped mechanism, the pressure quick corresponding mechanism is fixed on the bearing mechanism, and when pressure is generated in the safety valve cavity, the pressure can act on the outer side of the rubber sleeve to deform the rubber sleeve. A hardware mechanism is arranged to realize the sealing effect on the motor valve cavity through the matching with the valve bracket; the central shaft can penetrate through the hardware mechanism, and the magnets at the two ends of the central shaft can respectively attract the first Hall sensor and the second Hall sensor to sense the pressure inside and outside the motor valve cavity in a specific state; wherein, the one end face diameter of center pin is greater than other end face diameter for the center pin can not deviate from completely in the hardware mechanism.

Further, a line between the second hall sensor and the core control board passes through a line passing hole in the sealing rubber plug in the second through groove; the first Hall sensor is directly electrically connected with the core control panel.

Further, the communication module is in communication connection with the server in a wireless communication mode such as NB-IoT, LoRa, zigbee or GPRS. Through this communication module, can upload the server with the gas relief valve state at any time, the gas safety control side of being convenient for makes statistics of. Especially, when the device detects that the pressure is abnormal, the flow is abnormal or the battery power is low, the device can directly inform the user or the gas safety management party of corresponding processing through the wireless module. A method for intelligently opening a safety valve comprises the intelligent gas safety valve, and comprises the following steps:

s1: under the valve closing state, obtaining a pressure value Pe1 acquired by the ambient temperature pressure sensor, obtaining a pressure value Po1 acquired by the air outlet temperature pressure sensor, and obtaining the relative pressure Pob1 of the air outlet which is Po1-Pe 1;

s2: when the valve is in a closed state, and a user presses a gas stove ignition knob to ignite, a pressure value Pe2 acquired by the ambient temperature pressure sensor is obtained, a pressure value Po2 acquired by the air outlet temperature pressure sensor is obtained, and the relative pressure Pob2 of the air outlet is Po2-Pe 2; and Pob2 was measured to be 0;

s3: when the MCU controller detects that Pob2 is instantly reduced to 0, the gas safety valve is opened after delaying for 1 second, the gas safety valve is closed after delaying for 1 second, the pressure value Pe3 acquired by the ambient temperature and pressure sensor at the moment is acquired after delaying for 1 second, the pressure value Po3 acquired by the air outlet temperature and pressure sensor is acquired, and the relative pressure Pob3 of the air outlet at the moment is Po3-Pe 3;

s4: judging the relation between the value Pob3 and Pob1 and Pob2 respectively:

if the value of Pob3 is close to Pob1, the fact that the user presses the gas stove firing knob to fire is considered, the core control panel controls the gas safety valve to be automatically opened, and the user uses fire normally;

if the value of Pob3 is close to Pob2, that is, Pob3 is close to 0Pa, delaying for 1 second, repeating step S3 to obtain Pob3 'for re-judgment, and when the repetition times exceed 5 times and the value of the judgment result Pob3' is close to Pob2 all the time, determining that the gas safety valve pipeline falls off or is damaged, closing the valve, and reporting the pipeline fault through the communication module;

when the value of the judging period Pob3' is close to Pob1, the core control panel controls the gas safety valve to automatically open.

It is worth mentioning that the method is premised that when a user uses the gas stove to ignite, the ignition knob of the gas stove is pressed for the first time to ignite and not to ignite, the user can restore the ignition knob and then ignite again, and the normal gas using flow of the user is realized at present. The invention is based on the premise that whether the user needs to use fire or not is judged. The principle is that when a user presses the firing knob for the first time, the motor valve is opened to charge air to the rear end pipeline, so that the pressure of the motor valve reaches the normal air supply pressure, the relative pressure Pob3 of the air outlet obtained by monitoring is close to Pob1, the judgment that the user needs to use fire can be obtained, the core control board directly controls the motor valve to be opened, the user restores the firing knob, then the firing is carried out again, and the motor valve is opened at the moment, so that the gas can be used normally.

If the pipeline of the gas safety valve drops or is damaged, the valve is closed after the valve is opened for 1 second, the gas filled into the pipeline at the rear end is inflated, and the gas can be quickly leaked, so that the measured relative pressure Pob3' of the gas outlet after 1 second is delayed to be still close to 0, the test is repeated for 5 times, the measured pressure values of the gas outlet are only 0, the judgment that the pipeline at the rear end drops or is damaged can be obtained at the moment, the valve is closed, and the fault of the pipeline is reported through the communication module.

The core lies in that when the user uses the gas, the ignition knob of the gas stove is pressed for the first time to ignite the non-combustible gas, the user can restore the ignition knob, and when the non-combustible gas is restored, the rear-end pipeline is sealed, and the supplemented gas cannot be leaked out; when the pipeline falls off or is damaged, the rear end of the pipeline is not sealed, and the normal pressure value can not be kept when the valve is closed.

A method for intelligently closing a safety valve comprises the intelligent gas safety valve, and comprises the following steps:

s5: when the valve is in an open state and fire continues to be used on the gas stove, acquiring a pressure value Pi4 acquired by the air inlet temperature and pressure sensor and acquiring a pressure value Po4 acquired by the air outlet temperature and pressure sensor, wherein the relative pressure Pio4 of the air inlet and the air outlet is Pi4-Po 4;

s6: when the valve is in an open state and the gas stove is not fired, acquiring a pressure value Pi5 acquired by the air inlet temperature pressure sensor at the moment, acquiring a pressure value Po5 acquired by the air outlet temperature pressure sensor, and acquiring the relative pressure Pio5 of the air inlet and the air outlet as Pi5-Po 5;

s7: and obtaining the pressure loss Pd which is Pio4-Pio5, and if the Pd is close to the threshold value N and the core control board completes valve closing detection after delaying for a period of time t, considering that the operation of closing the fire by the user is the fact, and closing the gas safety valve.

It is known that, due to the existence of a filter screen mechanism between the air inlet and the air outlet, the filter screen mechanism not only plays a role in filtering large-particle impurities in the air, but also can cause pressure loss to the air pressure of the pipeline, and the pressure loss caused by the filter screen mechanism can be controlled by controlling the size and the number of the openings of the filter screen mechanism, so that the pressure loss can meet the definition of rated flow in the industry standard CJ/T447-2014 pipeline gas self-closing valve, namely the air circulation capacity of the self-closing valve under the working conditions of rated inlet pressure and maximum allowable pressure drop. Namely the flow when the pressure drop of the air inlet and the air outlet is 300Pa is the rated flow, and the rated flow of the valve is assumed to be 0.6m³And h, the pressure loss between the air inlet and the rear end of the air outlet of the safety valve is 300Pa, the main control factor causing the pressure loss is the filter screen mechanism, and products with different rated flow rates are controlled by controlling the open pores of the filter screen mechanism.

The flow rate of the gas range according to the prior gas stove with a full open range is about 0.6m³That is, assuming that the relative pressure Pio4 between the air inlet and the air outlet is measured when a burner is fully opened, the pressure loss Pd is equal to about 300Pa from the difference between Pio4-Pio5, and Pd gradually decreases from 300Pa when the burner is slowly turned down from the fully opened state, and finally Pd is equal to about 0 when the fire is turned off, and it can be determined that the user is turning off the fire. Since the temperature and pressure sensor has a certain error, during actual design, it is determined that the threshold value at which the user may turn off the fire is N, that is, when Pd is less than N, it is determined that the user may turn off the fire, but the valve is not closed immediately at this time.

Further, the valve closing detection process:

s8: when Pd is close to the threshold value N and the delay time t is up, the core control panel controls the gas safety valve to be closed slowly, the gas safety valve is closed to a certain degree one by one, the gas safety valve stays for a period of time after being closed to a certain degree every time, and Pd' is obtained through detection;

s9: judging the change trend of Pd':

if Pd' is larger than the threshold value M, the small-flow gas circulation exists at the moment, the user uses the minimum fire, the detection is finished, and the valve of the gas safety valve is completely opened;

if the gas safety valve is closed successively until the valve is closed completely, and Pd' is lower than the threshold value N all the time, the operation of shutting down the fire by the user is considered as the fact, and the gas safety valve is determined to be closed.

In addition, when the user cooks with the minimum fire, the pressure loss Pd at the time of the minimum fire may not be much different from the pressure loss at the time of the shut-off fire, or may be lower than N, and then if the valve is closed, the normal cooking of the user may be affected. Therefore, if the user needs to judge whether the fire is really turned off or the minimum fire is used for cooking, the gas valve is closed when the fire is really turned off, and the gas valve is not closed when the minimum fire is used for cooking. In order to accurately judge, the valve air outlet end of the motor valve is set to be triangular, so that the changed flow area is nonlinearly changed in the process of gradually closing the valve of the motor valve, and misjudgment can be avoided when the current state of a user is judged to be a fire-off state or a small fire cooking state. Specifically, when Pd is less than N and the t time delay time is up, a valve closing detection process is started; slowly closing the valve, gradually closing the gas safety valve to a certain degree, staying for a period of time after closing to a certain degree each time, detecting to obtain new pressure loss Pd ', judging the change trend of Pd', if Pd 'has a gradually increasing trend in the process of slowly closing the valve and Pd' is greater than M, considering that a small flow exists, completely opening the valve, and after the detection is finished, not closing the valve; if the gas valve is slowly closed until the gas valve is completely closed, the trend that Pd 'gradually increases does not appear, and Pd' is not more than N, the gas valve is directly closed without being opened, and the fact that the user really shuts off the fire at the moment is judged. Therefore, the situation that the normal cooking of the user is influenced by mistaken fire shutting can be completely avoided.

In the present application, the threshold value N is 30 Pa; the threshold value M is 50 Pa.

Wherein, in the application, the time t is 10 minutes.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the invention relates To an intelligent gas safety valve and a method for intelligently opening and closing the safety valve, wherein an air inlet temperature pressure sensor, an air outlet temperature pressure sensor and an environment temperature pressure sensor are arranged, temperature data Ti and pressure data Pi at an air inlet end, temperature data To and pressure data Po at an air outlet end, and temperature data Te and pressure data Pe of the external environment of a gas pipeline are respectively collected, and the data in different states are monitored, so that the function of automatically opening the gas valve when a user needs To use gas can be realized, the function of automatically closing the gas valve after the user finishes using the gas valve is realized, the user does not need To manually operate the opening and closing of the gas valve, the condition that the user forgets To close the valve after finishing using the gas valve is avoided, and the safety performance of the gas valve is greatly improved.

2. The invention relates to an intelligent gas safety valve and an intelligent safety valve opening and closing method. Therefore, in the process of automatically closing the gas valve, whether the user actually shuts off the fire or cooks with the minimum fire at the moment can be accurately judged, and the situation that the normal cooking of the user is influenced by mistaken shut-off of the fire is avoided. Because the gas flow rate when the user cooks with the minimum fire is also low, if the gas flow area changes linearly during the valve closing process, the behavior of the user cooking with the minimum fire is easily misjudged as the user turning off the fire.

3. The utility model provides an intelligent gas relief valve, through the temperature data Ti, the pressure data Pi of gathering the inlet end, the temperature data To, the pressure data Po of the end of giving vent To anger To and the temperature data Te, the pressure data Pe of gas pipeline external environment, judge the pipeline superpressure, under-pressure, overtemperature condition. The gas safety hidden danger can be found, the user can be reminded in time, and even specific conditions can be reported to the server.

4. An intelligent gas safety valve can realize the function of monitoring tiny leakage of gas. By monitoring the state of Po in real time, if the pipeline is absolutely sealed, Po does not have a descending trend and is always in a relatively stable pressure state; if there is some minor leakage in the pipe, Po will trend downward and fall to match the external ambient pressure data Pe during time T. The time T can be classified, and the shorter the time T is, the more serious the fuel gas leakage is, so that the serious leakage can be treated preferentially by reasonably arranging personnel in related departments.

5. The utility model provides an intelligence gas relief valve, the integration is provided with filter screen mechanism on valve bracket, filter screen mechanism has been divided into one-level filter screen part and second grade filter screen part, the through-hole on the one-level filter screen is the aperture, the through-hole on the second grade filter screen is the macropore, in-process opened gradually at the valve, through-hole on the one-level filter screen is opened at first, through-hole on the second grade filter screen still is in the encapsulated situation this moment, at this moment through releasing a small part gas to pipeline rear end and carry out pressure detection, owing to do not all open the valve, even there is the gas leakage in the pipeline rear end, also because the gas volume of release is less, the leakage volume that it produced.

6. The utility model provides an intelligent gas safety valve, has set up ear structure on valve bracket to be provided with air inlet temperature pressure sensor in one side of ear structure orientation valve air inlet, ear structure is provided with the temperature pressure sensor of giving vent to anger towards one side of valve gas outlet, makes sensor simple to operate, has reduced the whole cost of product simultaneously, has improved the packaging efficiency.

7. The utility model provides an intelligent gas safety valve, has cancelled the sealing joint on the traditional motor valve, leads to the groove through setting up first logical groove, second to lead to the inslot interference at first logical groove, second and set up sealing rubber stopper, set up on sealing rubber stopper and cross empty, realize sealed operation through the extrusion of assembling in-process to sealing rubber stopper, make the volume of whole product reduce, cost greatly reduced also simultaneously, the equipment is also simpler.

8. The utility model provides an intelligence gas relief valve, has newly increased pressure change quick response mechanism, and this mechanism reduces suddenly when being less than minimum pressure limit value or rise suddenly and exceed the maximum pressure limit value at pressure, can make the response fast, does not receive MCU controller itself and samples pressure sensor's cycle length according to certain cycle and restrict to both realize the quick response of safety function, reduced the consumption again, extension battery life. When the user fires and uses the gas, response speed is faster, and user experience is improved.

9. The utility model provides an intelligent gas safety valve, the safety valve casing still is provided with the button outward, and the user presses or loosens the button, and the core control board obtains different level signal, just can judge the key state this moment through different level signal, learns user's intention then, and convenience of customers directly opens the gas valve and closes and switches in two operation options of gas valve through this button.

10. When a user executes operation, the intelligent gas safety valve can indicate different information through the four indicator lamps according to the operation of the user and the working state of equipment.

Drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of a relief valve chamber;

FIG. 2 is a top view of the relief valve chamber;

FIG. 3 is a schematic view of an electromechanical valve;

FIG. 4 is a schematic view of a valve carriage;

FIG. 5 is a schematic view of a valve carriage;

FIG. 6 is a schematic view of a valve carriage;

FIG. 7 is a schematic view of a pressure change quick response mechanism;

FIG. 8 is a circuit diagram of an MCU controller;

FIG. 9 is a circuit diagram of a power conversion part;

FIG. 10 is a circuit diagram of the valve actuating portion;

FIG. 11 is a circuit diagram of a level converting part;

FIG. 12 is a circuit diagram of a communication module;

FIG. 13 is a schematic view of a conventional electromechanical valve;

in the figure, 1-a safety valve cavity, 2-a cavity air inlet, 3-a cavity air outlet, 4-a motor valve, 5-a valve air inlet, 6-a valve air outlet, 7-a valve bracket, 8-an ear-shaped structure, 9-an inlet air temperature pressure sensor, 10-an outlet air temperature pressure sensor, 11-a first-level filter screen, 12-a second-level filter screen, 13-a first through groove, 14-a second through groove, 15-a sealing rubber plug, 16-a line passing hole, 17-a power supply module, 18-a pressure change quick response mechanism, 19-a rubber sleeve, 20-a central shaft, 21-a spring, 22-a magnet, 23-a second Hall sensor and 24-a first Hall sensor.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The present invention will be described in detail with reference to fig. 1 to 13.

Example 1

An intelligent gas safety valve comprises a safety valve shell, wherein a closed safety valve cavity 1 shown in figures 1 and 2 is arranged inside the safety valve shell, a cavity gas outlet 3 and a cavity gas inlet 2 are arranged on the safety valve cavity 1, a motor valve 4 is arranged in the safety valve cavity 1, a valve gas inlet 5 and a valve gas outlet 6 which are respectively communicated with the cavity gas outlet 3 and the cavity gas inlet 2 are arranged on the motor valve 4, the motor valve 4 further comprises a valve support 7, the bottom of the valve support 7 is connected with the motor valve 4 through a fastening piece, the top of the valve support 7 is the valve gas inlet 5, a filter screen mechanism is integrally arranged at the top of the valve support 7, and a plurality of valve gas outlets 6 are formed in the side wall of the valve support 7;

an ear-shaped structure 8 shown in fig. 3 and 4 extends from the outer wall of the valve support 7, an inlet air temperature and pressure sensor 9 is arranged on one side of the ear-shaped structure 8 facing the valve inlet 5, and an outlet air temperature and pressure sensor 10 is arranged on one side of the ear-shaped structure 8 facing the valve outlet 6; an environment temperature and pressure sensor is also arranged outside the safety valve shell;

the valve air outlet 6 is triangular;

a pressure change quick response mechanism is also arranged in the safety valve cavity 1;

as shown in fig. 12, the conventional motor valve is not provided with a sensor, so that it is difficult to monitor the gas pressure at the valve inlet and the valve outlet, and it is impossible to realize more intelligent requirements according to the monitoring data, and therefore, the valve support 7 does not have a position for arranging a sensor; if a sensor is arranged on the traditional motor valve 4, a complex sealing joint is required to be arranged in the direction of the valve air inlet 5, and a sealing cover of the valve air inlet 5 is added, so that the cost is increased, and the convenience of assembly is reduced. Meanwhile, the valve air outlet of the traditional motor valve is rectangular, the gas flow is linear, and misjudgment often occurs when the using state of a user is judged.

A core control board is further arranged in the safety valve shell and outside the safety valve cavity 1, and an MCU controller and a communication module of the type STM8L052R8T6 are further integrated on the core control board; the device also comprises a key, an indicator light and a power module 17; and the air inlet temperature and pressure sensor 9, the air outlet temperature and pressure sensor 10, the environment temperature and pressure sensor, the motor valve 4, the key, the indicator light, the power module 17 and the pressure change quick response mechanism 18 are all electrically connected with the core control panel.

Compared with the traditional filter screen mechanism which is arranged on the valve support 7 in a split mode, the filter screen mechanism is integrally arranged on the valve support 7, the valve support is more convenient to manufacture and install accessories, and the filter screen mechanism is structurally adjusted, so that the whole device has richer functions.

According to the invention, the ear-shaped structure 8 is arranged on the outer wall of the valve bracket 7 in an extending manner, the air inlet temperature and pressure sensor 9 is arranged on one side of the ear-shaped structure 8 facing the air inlet 5 of the valve, and the air outlet temperature and pressure sensor 10 is arranged on one side of the ear-shaped structure 8 facing the air outlet 6 of the valve, so that the sensor is convenient to install, the overall cost of the product is reduced, and the assembly efficiency is improved.

According to the invention, the valve outlet 6 is arranged to be triangular, so that the changed flow area is changed in a nonlinear way in the process of gradually closing the valve outlet 6. The misjudgment can be avoided when the current state of the user is the fire-off state or the small fire cooking state.

Example 2

This example is a supplementary explanation of example 1.

As shown in fig. 4, 5 and 6, the filter screen mechanism includes a primary filter screen 11 and a secondary filter screen 12, the primary filter screen 11 is surrounded outside the secondary filter screen 12, and the secondary filter screen 12 protrudes out of the surface of the primary filter screen 11 and is closer to the cavity air inlet 2 than the primary filter screen 11; a plurality of through holes are formed in the first-stage filter screen 11 and the second-stage filter screen 12.

Wherein, the sectional area of the through holes on the first-stage filter screen 11 is smaller than that of the through holes on the second-stage filter screen 12.

The filter screen mechanism and the valve bracket 7 are integrally designed, and compared with the regular through hole design on the traditional filter screen mechanism, the filter screen mechanism is divided into a first-stage filter screen 11 part and a second-stage filter screen 12 part, the through hole on the first-stage filter screen 11 is a small hole, the through hole on the second-stage filter screen 12 is a large hole, in the process of gradually opening the valve, the through hole on the first-stage filter screen 11 is firstly opened, the through hole on the second-stage filter screen 12 is in a closed state, and at the moment, a small part of gas is released to the rear end of the pipeline and pressure detection is carried out.

Example 3

This example is a supplementary explanation of example 1.

As shown in fig. 4, 5 and 6, a first through groove 13 is formed in the ear-shaped structure 8, a second through groove 14 is formed in the safety valve cavity 1, a sealing rubber plug 15 shown in fig. 6 is arranged in the first through groove 13 and the second through groove 14 in an interference manner, and a plurality of wire passing holes 16 are formed in the sealing rubber plug 15; wherein, the line between the inlet air temperature and pressure sensor 9 and the core control board passes through the line through hole 16 on the sealing rubber plug 15 in the first through groove 13; the lines among the air outlet temperature and pressure sensor 10, the motor valve 4 and the core control board pass through a line through hole 16 on a sealing rubber plug 15 in the second through groove 14.

Wherein, first logical groove 13, second lead to groove 14 and sealing rubber stopper 15 and are the round platform form, and the tip cross-sectional diameter that first logical groove 13, second lead to groove 14 is less than sealing rubber stopper 15 tip cross-sectional diameter.

The traditional motor valve 4 is usually sealed by a standard sealing connector, and has large volume and high cost. The invention is provided with a closed safety valve cavity 1, and only the second through groove 14 is arranged on the safety valve cavity 1 and the first through groove 13 is arranged on the ear-shaped structure 8 of the valve bracket 7 for wiring. In order to prevent the gas from leaking at the first through groove 13 and the second through groove 14, sealing rubber plugs 15 are arranged at two positions, a wire passing hole 16 is formed in each sealing rubber plug 15, and the sealing rubber plugs 15 are in interference connection with the first through groove 13 and the second through groove 14. In actual installation, because sealing rubber stopper 15's volume slightly is greater than first logical groove 13, the second leads to groove 14, so in two adjacent spare part assembling processes, can cause the extrusion to sealing rubber stopper 15, make it stabilize and imbed first logical groove 13, the second leads to in the groove 14, and first logical groove 13, the inner wall that the second led to groove 14 extrudees sealing rubber stopper 15 simultaneously, sealing rubber stopper 15's deformation makes each gap all filled up, finally realized sealed effect.

Example 4

This embodiment is a supplementary description of embodiment 1, and is intended to explain the details of the mechanism corresponding to rapid pressure change.

As shown in fig. 7, the pressure change quick response mechanism 18 includes a rubber sleeve 19 and a central shaft 20 disposed in the rubber sleeve 19, a spring 21 is sleeved outside the central shaft 20, and magnets 22 are embedded on both sides of the central shaft 20; the outer side of the rubber sleeve 19 is opened, and the inner side is sealed; the safety valve further comprises a first Hall sensor 24 and a second Hall sensor 23 which are arranged on the outer side of the rubber sleeve 19 and the inner side of the rubber sleeve 19 respectively and are away from the central shaft 20 by a certain distance, the first Hall sensor 24 is arranged on the outer side of the safety valve cavity, and the second Hall sensor 23 is arranged on the inner side of the safety valve cavity.

The present invention provides a pressure change quick response mechanism 18, which is primarily used to improve the quick response to pressure changes. In the aforesaid through admit air temperature pressure sensor, the temperature pressure sensor of giving vent to anger and ambient temperature pressure sensor, judge pipeline superpressure, under-pressure, the overtemperature condition, rely on periodic sampling to judge, its judgement speed receives the influence of the length of adopting the cycle: the sampling period is long, and the response speed is slow; short sampling period, high power consumption and short battery life. The pressure quick corresponding mechanism can trigger quick detection when the pressure at the air outlet of the valve is suddenly reduced to the lowest pressure limit value due to the reasons of leakage and falling of an outlet pipeline, fire when a user opens a gas stove and the like; a sudden pressure increase beyond the maximum pressure limit can also trigger a rapid valve closure.

When an overpressure or underpressure condition occurs, the valve needs to be closed. When the valve is in a closed state, the air inlet of the valve is under-pressure or over-pressure, and the valve does not need to react immediately; when the valve is in an open state, the valve air inlet is communicated with the valve air outlet, the pressure of the valve air inlet is fed back to the pressure change quick response mechanism 18, and the response action is triggered to realize quick valve closing under overpressure or underpressure.

The principle of the pressure change quick response mechanism 18 is as follows: when the pressure at the cavity air outlet is in a normal range, the pressure can push the central shaft 20 to move towards the first hall sensor 24, and the central shaft 20 is located between the first hall sensor 24 and the second hall sensor 23, and at this time, any one hall sensor is not triggered, that is, no overpressure or underpressure occurs. When the undervoltage happens, the spring 21 pushes the central shaft 20 towards the direction of the second hall sensor 23, namely the magnet 22 on the side is close to the second hall sensor 23, so that the second hall sensor 23 attracts the magnet 22 to output a low level, the MCU controller generates an interrupt, and the MCU controller makes a response quickly to confirm whether the pipeline is damaged or the user is performing a firing action. When overpressure occurs, the rubber sleeve 19 compresses to push the central shaft 20 towards the first hall sensor 24, and the displacement distance of the central shaft 20 is large due to overlarge pressure, so that the magnet 22 on the side of the central shaft 20 attracts the first hall sensor 24 to trigger the MCU controller to rapidly close the valve.

Example 5

This embodiment is a supplementary description of embodiment 4, and provides a means of mounting a quick-response mechanism to pressure.

The quick pressure change response mechanism 18 is fixed on the cavity wall of the safety valve cavity through the fastener, a sealing mechanism is arranged between the fastener and the cavity wall, and the sealing mechanism comprises a sealing rubber sleeve and a sealing ring. The sealing rubber sleeve and the sealing ring can be arranged in a split mode or in an integrated mode.

Example 6

As shown in fig. 1, 2, 4 and 5, the safety valve comprises a hardware mechanism, wherein the hardware mechanism is arranged on the cavity wall of the safety valve cavity, and a channel for accommodating the central shaft 20 to pass through is arranged on the hardware mechanism; pressure change quick response mechanism 18 sets up on the outer wall of valve support, and 19 outsides of rubber sleeve and hardware mechanism butt, is provided with the sealing washer between the two.

Example 7

This embodiment is a supplementary description of embodiment 1, and aims to describe a method for determining the overpressure, underpressure and overtemperature conditions of the pipeline by using the device.

The inlet temperature and pressure sensor and the outlet temperature and pressure sensor are respectively fixed on the inner sides of the air inlet and the air outlet of the safety valve cavity, signal lines and valve control lines are led out from the same sealing joint to be connected with the core control board, and data transmission is carried out between each temperature and pressure sensor and the central control board through I2C signals, so that temperature data and pressure data acquired by each temperature and pressure sensor are acquired.

Specifically, the air inlet temperature and pressure sensor, the air outlet temperature and pressure sensor and the environment temperature and pressure sensor of the present invention can respectively collect temperature data Ti and pressure data Pi of an air inlet end, temperature data To and pressure data Po of an air outlet end, and temperature data Te and pressure data Pe of an external environment of a gas pipeline, so that the above data can be used To judge the overpressure, underpressure and overtemperature conditions of the pipeline, specifically as follows:

when the pressure difference value of Pi and Pe exceeds the upper limit value of the set pressure, the pipeline is prompted to alarm for overpressure, and the valve is closed; the upper limit value set in the embodiment is 8KPa +/-2 KPa;

when the pressure difference value of Pi and Pe is lower than the lower limit value of the set pressure, prompting pipeline under-pressure alarm, and closing the valve; the lower limit value set in the embodiment is 800Pa +/-200 Pa;

when any one of the three temperature values of Te, Ti and To is higher than the set upper limit temperature value, an overtemperature alarm is prompted, and the valve is closed; the upper limit value of the temperature set in this example is 45 ℃. + -. 0.5 ℃.

Example 8

This embodiment is a supplementary description of embodiment 1, and is intended to describe a method by which the apparatus can realize the function of monitoring the tiny gas leakage.

The principle is that after a gas valve is closed, the section of pipeline between the gas valve and a gas stove is in an absolute sealing state, pressure data Po inside the sealed pipeline is obtained in real time through a gas outlet temperature pressure sensor, and if the pipeline is in an absolute sealing state, Po does not have a descending trend and is always in a relatively stable pressure state; if there is some minor leakage in the pipe, Po will trend downward and fall to match the external ambient pressure data Pe within a certain time, assuming this time is T, i.e., when there is a leakage, Po will fall to coincide with Pe within time T. Specifically, the gas leakage grade is determined according to the size of T, the shorter the time of T is, the more serious the gas leakage is, the longer the time of T is, the weaker the gas leakage is, and if T is infinite, the leakage is not.

Example 9

This example is a supplementary description of example 8.

On the basis of realizing the tiny leakage monitoring function of the gas, in order to conveniently and reasonably arrange personnel for troubleshooting on gas leakage accidents by relevant departments, n gas leakage grades can be divided, the gas leakage grades can be adjusted according to actual conditions, the purpose is to enable serious leakage to be preferentially processed, and safety accidents are avoided. For example: the gas leakage grade can be preliminarily divided into 4 grades, severe leakage is realized when T is less than or equal to 10 seconds, moderate leakage is realized when T is more than 10 seconds and less than or equal to 30 seconds, micro leakage is realized when T is more than 30 seconds and less than or equal to 300 seconds, and the normal state is indicated when T is more than 300 seconds.

Example 10

This embodiment is a supplementary description of embodiment 1, and is intended to explain the specific functions of the key.

Example 11

This embodiment is a supplementary description of embodiment 1, and is intended to explain the specific function of the indicator light.

Example 12

This example is a supplementary explanation of example 1.

The environment temperature pressure sensor provided by the invention can acquire temperature data Te and pressure data Pe of the external environment of the gas pipeline; however, after the rapid pressure change response mechanism 18 is provided, when a user fires, gas at the rear end of the pipeline is released, and the pressure at the valve gas outlet acquired by the rapid pressure change response mechanism 18 is the pressure data Pe of the external environment acquired by the ambient temperature and pressure sensor. Therefore, when the rapid pressure change response mechanism 18 is present, the ambient temperature pressure sensor is no longer needed to obtain the pressure data of the external environment, and such a way of omitting the ambient temperature pressure sensor also falls within the protection scope of the present application.

Example 13

A method for intelligently opening a safety valve, comprising the intelligent gas safety valve described in embodiment 1, and comprising the following steps:

s1: under the valve closing state, obtaining a pressure value Pe1 acquired by an ambient temperature pressure sensor, obtaining a pressure value Po1 acquired by an outlet temperature pressure sensor, and assuming that Pob1 is 2000pa at this time, the relative pressure Pob1 of the outlet is Po1-Pe 1;

s2: when the valve is in a closed state, and a user presses a gas stove ignition knob to ignite, a pressure value Pe2 acquired by the ambient temperature pressure sensor is obtained, a pressure value Po2 acquired by the air outlet temperature pressure sensor is obtained, and the relative pressure Pob2 of the air outlet is Po2-Pe 2; and Pob2 was measured to be 0. There are two possible reasons, the first is that the user presses the firing knob of the gas range when firing normally; secondly, the gas hose falls off or is largely damaged. The first condition is normal, and the valve needs to be opened in time to supply air to users, and if the second condition is adopted, the valve cannot be opened for a long time, so that danger can be caused. Therefore, two cases are judged.

S3: when the MCU controller detects that Pob2 is instantly reduced to 0, the gas safety valve is opened after 1 second of time delay, the gas safety valve is closed after 1 second of time delay, the pressure value Pe3 acquired by the environment temperature and pressure sensor at the moment is acquired after 1 second of time delay, the pressure value Po3 acquired by the air outlet temperature and pressure sensor is acquired, and the relative pressure Pob3 of the air outlet is Po3-Pe3 at the moment. The premise of the step is that when a user uses the gas stove to ignite, the ignition knob of the gas stove is pressed for the first time to ignite and not to ignite, the user can restore the ignition knob and then ignite again, and the normal gas using flow for the user is achieved at present.

S4: judging the relation between the value Pob3 and Pob1 and Pob2 respectively:

The principle of the method is that when a user presses a firing knob for the first time, the motor valve is opened to charge air to a rear end pipeline, the pressure of the motor valve reaches normal air supply pressure, the monitored relative pressure Pob3 of an air outlet is close to Pob1, the judgment that the user needs to use fire can be obtained, the core control board directly controls the motor valve to be opened, the user restores the firing knob, then the fire is fired again, and the motor valve is opened at the moment, so that the user can use the air normally.

Example 14

A method for intelligently closing a safety valve, comprising the intelligent gas safety valve in embodiment 1, and comprising the following steps:

The flow rate of a full open burner of the gas range is about 0.6m according to the prior art³That is, assuming that the relative pressure Pio4 between the inlet and the outlet is measured when a burner is fully opened, the pressure loss Pd is equal to the difference between Pio4-Pio5, which is approximately equal to the rated flow rate of 300Pa, and Pd gradually decreases from 300Pa during the slow adjustment of the burner from the fully opened state, and finally Pd is equal to 0 after the fire is closed, which may determine that the user is turning off the fire. Since the temperature and pressure sensor has a certain error, during actual design, it is determined that the threshold value at which the user may turn off the fire is N, that is, when Pd is less than N, it is determined that the user may turn off the fire, but the valve is not closed immediately at this time.

Example 15

This example is a supplementary explanation of example 14.

When a user cooks with a minimum fire, the pressure loss Pd at the time of the minimum fire may not be much different from the pressure loss at the time of the shut-off fire, or may be lower than N, and then if the valve is closed, the normal cooking of the user may be affected. Therefore, if the user needs to judge whether the fire is really turned off or the minimum fire is used for cooking, the gas valve is closed when the fire is really turned off, and the gas valve is not closed when the minimum fire is used for cooking. Therefore, a valve closing monitoring process is provided. Meanwhile, in order to accurately judge, the valve air outlet end of the motor valve is set to be triangular, so that the changed flow area is nonlinearly changed in the process of gradually closing the valve of the motor valve, and misjudgment can be avoided when the current state of a user is judged to be a fire-off state or a small-fire cooking state.

The valve closing detection process comprises the following steps:

s9: judging the change trend of Pd':

Specifically, when Pd is less than N and the t time delay time is up, a valve closing detection process is started; slowly closing the valve, gradually closing the gas safety valve to a certain degree, staying for a period of time after closing to a certain degree each time, detecting to obtain new pressure loss Pd ', judging the change trend of Pd', if Pd 'has a gradually increasing trend in the process of slowly closing the valve and Pd' is greater than M, considering that a small flow exists, completely opening the valve, and after the detection is finished, not closing the valve; if the gas valve is slowly closed until the gas valve is completely closed, the trend that Pd 'gradually increases does not appear, and Pd' is not more than N, the gas valve is directly closed without being opened, and the fact that the user really shuts off the fire at the moment is judged. Therefore, the situation that the normal cooking of the user is influenced by mistaken fire shutting can be completely avoided.

Wherein, in the application, the time t is 10 minutes.

Example 16

This embodiment is a supplementary description of embodiments 1 to 15, and is used to briefly describe the circuit connection method of the present invention.

The purpose of the power conversion part shown in fig. 8 is to convert the voltage input by the battery into a stable voltage of 3.3V through U102, and then to supply power to the three temperature and pressure sensors, the MCU controller shown in fig. 7, the valve driving part shown in fig. 9, the communication module shown in fig. 11 (the communication module in this embodiment is an NB-IoT module), and the like.

The MCU controller part is a control circuit consisting of a core MCU controller chip STM8L052R8T6, is mainly responsible for collecting, controlling and processing data of peripheral modules and is a core unit of the whole system; the valve driving part is a driving circuit which is composed of a valve driving chip SPX3010 and used for carrying out on-off control on a direct current motor valve, meanwhile, a driving output signal is connected to the upper surface of a valve assembled in a safety valve cavity through a P102, an I2C signal is led out from the upper surface of the P102 and is connected with an air inlet temperature pressure sensor 9 and an air outlet temperature pressure sensor 10 in the safety valve cavity, and the types of the air inlet temperature pressure sensor, the air outlet temperature pressure sensor and an environment temperature pressure sensor are BM280, so that the circuit diagram of the sensors is not repeated. The LED control signals, key signals, etc. of the motherboard where the MCU controller shown in fig. 7 is located are LED out from the MCU controller, and are connected to the LED lamp and the keys through the connectors, and the keys and the LED lamp circuit diagram are not repeated here. The NB-IoT module shown in fig. 11 is a communication module portion composed of BC26, and is in communication with the MCU controller through a serial port, and the BC26 is mainly used to implement communication functions such as uploading alarm information; in the level conversion part shown in fig. 10, since the high level signal of BC26 is 1.8V, and the high level signal of the IO signal of the MCU controller is 3.3V, direct communication cannot be achieved, and the level conversion circuit is required to realize stable communication between BC26 and the MCU controller; the external SIM card part is a circuit matched with the NB-IoT module BC26 and is a part necessary for realizing identity recognition of the communication with a carrier base station.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be made by those skilled in the art without inventive work within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims

1. The utility model provides an intelligence gas relief valve, includes the safety valve case, the inside of safety valve case is equipped with closed safety valve cavity (1), be provided with cavity gas outlet (3), cavity air inlet (2) on safety valve cavity (1), and be equipped with motor valve (4) in safety valve cavity (1), be provided with valve air inlet (5), valve gas outlet (6) that communicate with cavity gas outlet (3), cavity air inlet (2) respectively on motor valve (4), its characterized in that: the motor valve (4) further comprises a valve support (7), the bottom of the valve support (7) is connected with the motor valve (4) through a fastener, the top of the valve support (7) is a valve air inlet (5), the top of the valve support (7) is integrally provided with a filter screen mechanism, and the side wall of the valve support (7) is provided with a plurality of valve air outlets (6);

an ear-shaped structure (8) extends from the outer wall of the valve bracket (7), an inlet air temperature and pressure sensor (9) is arranged on one side of the ear-shaped structure (8) facing the valve inlet (5), and an outlet air temperature and pressure sensor (10) is arranged on one side of the ear-shaped structure (8) facing the valve outlet (6); an environment temperature and pressure sensor is also arranged outside the safety valve shell;

the valve air outlet (6) is triangular;

a pressure change quick response mechanism (18) is also arranged in the safety valve cavity (1);

a core control panel is arranged in the safety valve shell and outside the safety valve cavity (1), and an MCU (microprogrammed control Unit) and a communication module are integrated on the core control panel; the device also comprises a key, an indicator light and a power module (17); and the air inlet temperature and pressure sensor (9), the air outlet temperature and pressure sensor (10), the ambient temperature and pressure sensor, the motor valve (4), the key, the indicator lamp, the power module (17) and the pressure change quick response mechanism (18) are all electrically connected with the core control panel.

2. The intelligent gas safety valve of claim 1, wherein: the filter screen mechanism comprises a primary filter screen (11) and a secondary filter screen (12), the primary filter screen (11) is arranged outside the secondary filter screen (12) in a surrounding mode, and the secondary filter screen (12) protrudes out of the surface of the primary filter screen (11) and is closer to the cavity air inlet (2) relative to the primary filter screen (11); the primary filter screen (11) and the secondary filter screen (12) are respectively provided with a plurality of through holes; the sectional area of the through holes on the first-stage filter screen (11) is smaller than that of the through holes on the second-stage filter screen (12).

3. The intelligent gas safety valve of claim 1, wherein: a first through groove (13) is formed in the ear-shaped structure (8), a second through groove (14) is formed in the safety valve cavity (1), sealing rubber plugs (15) are arranged in the first through groove (13) and the second through groove (14) in an interference mode, and a plurality of wire passing holes (16) are formed in the sealing rubber plugs (15); wherein a line between the air inlet temperature and pressure sensor (9) and the core control plate passes through a line passing hole (16) on a sealing rubber plug (15) in the first through groove (13); the circuits among the air outlet temperature pressure sensor (10), the motor valve (4) and the core control panel pass through a wire passing hole (16) on a sealing rubber plug (15) in the second through groove (14); first logical groove (13), second lead to groove (14) and sealed rubber buffer (15) and be the round platform form, and first logical groove (13), the second lead to the tip cross-sectional diameter of groove (14) and be less than sealed rubber buffer (15) tip cross-sectional diameter.

4. The intelligent gas safety valve of claim 3, wherein: the pressure change quick response mechanism (18) comprises a rubber sleeve (19) and a central shaft (20) arranged in the rubber sleeve (19), a spring (21) is sleeved outside the central shaft (20), and magnets (22) are embedded on two sides of the central shaft (20); the outer side of the rubber sleeve (19) is opened, and the inner side is sealed; the safety valve is characterized by further comprising a first Hall sensor (24) and a second Hall sensor (23) which are arranged on the outer side of the rubber sleeve (19) and the inner side of the rubber sleeve (19) and are away from the central shaft (20) by a certain distance, wherein the first Hall sensor (24) is arranged on the outer side of the safety valve cavity, and the second Hall sensor (23) is arranged on the inner side of the safety valve cavity (1).

5. The intelligent gas safety valve of claim 4, wherein: the safety valve is characterized by further comprising a fastener, wherein the fastener is used for fixing the pressure change quick response mechanism (18) on the cavity wall of the safety valve cavity (1), a sealing mechanism is arranged between the fastener and the cavity wall, and the sealing mechanism comprises a sealing rubber sleeve and a sealing ring.

6. The intelligent gas safety valve of claim 4, wherein: the safety valve further comprises a hardware mechanism, the hardware mechanism is arranged on the cavity wall of the safety valve cavity, and a channel for accommodating the central shaft (20) to pass through is arranged on the hardware mechanism; pressure change quick response mechanism (18) set up on valve support's outer wall, and rubber sleeve (19) outside and hardware mechanism butt are provided with the sealing washer between the two.

7. An intelligent gas safety valve according to any one of claims 4-6, characterized in that: a line between the second Hall sensor (23) and the core control board passes through a line passing hole (16) on a sealing rubber plug (15) in the second through groove (14); the first Hall sensor (24) is directly electrically connected with the core control board.

8. A method for intelligently opening a safety valve, comprising the intelligent gas safety valve as claimed in any one of claims 1-6, characterized by comprising the following steps:

s1: under the valve closing state, obtaining a pressure value Pe1 acquired by an ambient temperature pressure sensor, obtaining a pressure value Po1 acquired by an outlet temperature pressure sensor, and then obtaining the relative pressure Pob1 of a valve air outlet (6) which is Po1-Pe 1;

s2: when the valve is in a closed state, and a user presses a gas stove ignition knob to ignite, a pressure value Pe2 acquired by an ambient temperature pressure sensor is obtained, a pressure value Po2 acquired by an air outlet temperature pressure sensor is obtained, and the relative pressure Pob2 of a valve air outlet (6) is Po2-Pe 2; and Pob2 was measured to be 0;

s3: when the MCU controller detects that Pob2 is instantly reduced to 0, the gas safety valve is opened after delaying for 1 second, the gas safety valve is closed after delaying for 1 second, the pressure value Pe3 acquired by the environment temperature and pressure sensor at the moment is acquired after delaying for 1 second, the pressure value Po3 acquired by the air outlet temperature and pressure sensor is acquired, and the relative pressure Pob3 of the air outlet (6) of the valve is Po3-Pe3 at the moment;

s4: judging the relation between the value Pob3 and Pob1 and Pob2 respectively:

9. A method of intelligently closing a safety valve, comprising an intelligent gas safety valve as claimed in any one of claims 1 to 6, comprising the steps of:

s5: when the valve is in an open state and fire continues to be used on the gas stove, a pressure value Pi4 acquired by the inlet air temperature and pressure sensor (9) is obtained, a pressure value Po4 acquired by the outlet air temperature and pressure sensor is obtained, and the relative pressure Pio4 of the valve inlet (5) and the valve outlet (6) is Pi4-Po 4;

s6: when the valve is in an open state and the gas stove is not on fire, acquiring a pressure value Pi5 acquired by the inlet air temperature and pressure sensor (9) at the moment, acquiring a pressure value Po5 acquired by the outlet air temperature and pressure sensor, and acquiring the relative pressure Pio5 of the inlet (5) and the outlet (6) of the valve as Pi5-Po 5;

10. The method of claim 9, wherein the method further comprises the steps of: the valve closing detection process comprises the following steps:

s9: judging the change trend of Pd':