Gas pipeline switch forgetting alarm and working method

Abstract

The application relates to the technical field of gas alarm devices, and particularly discloses a gas pipeline switch forgetting alarm and a working method, which comprises an alarm and a stove front valve, the alarm is installed on a stove front valve handle of the stove front valve, a digital pyroelectric sensor and two piezoelectric buzzers are arranged on a circuit board, a horizontal-vertical pipe installation adjusting track adopts a 1 / 4 circular arc, a horizontal-vertical pipe installation adjusting slider is slidably connected in the horizontal-vertical pipe installation adjusting track, and an inclined switch is installed on the horizontal-vertical pipe installation adjusting slider; the horizontal-vertical pipe installation adjusting slider is slid in the horizontal-vertical pipe installation adjusting track by being pushed in a horizontal-vertical pipe installation adjusting groove, and when the horizontal-vertical pipe installation adjusting slider is located at two ends of the horizontal-vertical pipe installation adjusting track, the alarm is adaptively installed on a horizontal pipe stove front valve or a vertical pipe stove front valve; the application detects the opening state of the stove front valve through the inclined switch, and cooperates with the digital pyroelectric sensor to monitor whether there is personnel in the kitchen to perform alarm, so that the occurrence of gas accidents is eliminated from the source, and the alarm after gas leakage is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas alarm device, in particular to a gas pipeline switch forgetting alarm and working method. BACKGROUND

[0002] Gas brings convenience to residents' life, but there are also hidden dangers in use. The safety precautions for home often involve matters related to gas safety: first, correctly use and regularly check gas facilities and appliances; second, do not seal the windows, and once gas leakage occurs, it will often cause serious consequences, leave home and before going to sleep at night, make sure the gas valve is in the closed position, and if gas leakage occurs, do not panic, turn off the valve and open the door and window, and do not touch the electrical switch and use open fire at this time; third, when using liquefied petroleum gas, coal gas, natural gas, etc. to boil water and cook, someone should be on guard, not far away from the kitchen, and when going out, cut off all fire sources, and the gas valve, joint and pipeline connection should be firm, and loose and aged parts should be repaired and replaced in time, and open fire should not be used to check for leaks, and soap solution can be used to check for leaks. The above records are all safety reminders for gas users to reduce safety hazards.

[0003] Natural gas users have a handle valve at the gas pipeline inlet, which is a front meter valve, and another valve connected to the hose, which is a front stove valve. The front stove valve must be closed before going to sleep, and it cannot be considered safe just by closing the gas stove switch. When people are away for a long time, the front stove valve must be closed, and for safety, the front meter valve should be closed. Gas safety accidents often occur, and the reasons for gas leakage accidents are summarized as follows:

[0004] 1. Gas leakage caused by problems with the hose connected to the front stove valve: gas hose is a special oil-resistant hose used to connect gas pipeline and gas appliance. According to the statistical analysis of gas accidents in recent years, more than 30% of all gas accidents are caused by aging or rat bites of gas hose.

[0005] (1) Long-term use of gas stove causes the two ends of the connected hose to loosen, causing gas leakage.

[0006] (2) Cracks in the hose caused by aging of the hose beyond the safe use period.

[0007] (3) Rats gnawing through natural gas hoses can cause natural gas leaks. Rats are rodents that have a pair of chisel-shaped teeth without roots. The teeth grow continuously, so they need to gnaw on hard objects frequently.

[0008] 2. Gas leakage caused by forgetting to turn off the stove or not closing the stove valve tightly after turning off the stove.

[0009] 3. The use of gas stove suddenly occurs during the process of gas supply interruption, and the stove valve is not closed in time, causing the leakage of pipeline gas when the gas supply is restored.

[0010] 4. Ignition failure, causing unburned gas to leak directly.

[0011] Therefore, it is necessary to install a gas alarm device in a kitchen using gas. The traditional gas alarm device generally detects the presence of flammable gas after gas leakage using related gas sensors and then issues a sound alarm. At this time, it is quite dangerous for gas users, and if they touch the electrical switch or use an open flame, a gas explosion accident will occur. Therefore, human intervention before gas leakage occurs is the best way to avoid gas leakage accidents. Therefore, it is urgent to design a gas pipeline switch forgetting alarm and working method that can issue a sound alarm in time to prompt the user to close the stove valve when the user has finished using gas and has not closed the valve, thereby eliminating the occurrence of gas accidents from the root cause and solving the problem of near danger that can be monitored by the existing gas alarm after gas leakage. SUMMARY

[0012] In view of the problems in the prior art, the purpose of the present application is to provide a gas pipeline switch forgetting alarm and working method.

[0013] The technical scheme adopted by the present application to solve its technical problems is: a gas pipeline switch forgetting alarm, comprising an alarm and a stove valve, the alarm is installed on the stove valve handle of the stove valve, the alarm is provided with a cover, a base, an inclined switch, a digital pyroelectric sensor and a piezoelectric buzzer, the cover is buckle connected to the base, the middle part of the base is provided with a circuit board, the circuit board is provided with a digital pyroelectric sensor and two piezoelectric buzzers, the base is provided with a battery compartment below one side of the circuit board, and the base is provided with a horizontal and vertical pipe installation adjustment track below the other side of the circuit board, the horizontal and vertical pipe installation adjustment track adopts a 1 / 4 circular arc, a horizontal and vertical pipe installation adjustment slider is slidably connected in the horizontal and vertical pipe installation adjustment track, the inclined switch is installed on the horizontal and vertical pipe installation adjustment slider, and the metal pin of the inclined switch is connected to the circuit board.

[0014] The cover is provided with a horizontal and vertical pipe installation adjustment slot, a pyroelectric sensor through hole and a buzzer through hole at the matching position, the horizontal and vertical pipe installation adjustment slider is moved in the horizontal and vertical pipe installation adjustment slot to slide in the horizontal and vertical pipe installation adjustment track, so as to adjust the alarm to be matched and installed on the horizontal pipe stove valve or the vertical pipe stove valve when the horizontal and vertical pipe installation adjustment slider is located at both ends of the horizontal and vertical pipe installation adjustment track.

[0015] Specific is, the stove front valve is installed on the gas pipeline, the gas pipeline includes horizontal pipe form and vertical pipe form, the horizontal pipe form of the gas pipeline is installed on the horizontal pipe stove front valve, the horizontal pipe stove front valve is installed or perpendicular to the horizontal plane, the vertical pipe form of the gas pipeline is installed on the vertical pipe stove front valve.

[0016] Specific is, when the vertical pipe stove front valve is installed on the alarm, the horizontal and vertical pipe installation adjustment slider is pulled to the lowermost end of the 1 / 4 circular arc horizontally placed to the right, the inclined switch is 45 degrees downward to the horizontal line when the vertical pipe stove front valve is closed, and the inclined switch is 45 degrees upward to the horizontal line when the vertical pipe stove front valve is counterclockwise opened, and the alarm is powered on.

[0017] When the horizontal pipe stove front valve is installed on the alarm, the horizontal and vertical pipe installation adjustment slider is pulled to the uppermost end of the 1 / 4 circular arc horizontally placed to the right, the inclined switch is 45 degrees downward to the horizontal line when the horizontal pipe stove front valve is closed, and the inclined switch is 45 degrees upward to the horizontal line when the horizontal pipe stove front valve is counterclockwise opened, and the alarm is powered on.

[0018] Specific is, the upper part of the base is provided with circuit board fixing tracks on both sides, the circuit board is installed on the circuit board fixing tracks through circuit board fixing columns, the inside of the circuit board fixing tracks is clamped with a battery compartment, a button cell is installed in the battery compartment, the positive pole of the button cell contacts the front spring device, and the negative pole of the button cell contacts the battery negative pole contact point welded at the bottom of the circuit board.

[0019] Specific is, the two sides of the base are provided with upper cover inclined clamping blocks for clamping and connecting the upper cover on the base, the digital pyroelectric sensor passes through the pyroelectric sensor through hole, and the head of the digital pyroelectric sensor is installed with a Fresnel lens for monitoring whether there is a person near the gas pipeline.

[0020] Specific is, the bottom of the base is provided with two fixed mounting blocks, the relative positions of the fixed mounting blocks are provided with sliding grooves, the sliding grooves are slidably connected with movable mounting blocks, the fixed mounting blocks are provided with bolt holes, the movable mounting blocks are provided with nut grooves at the relative positions, and the bolt passes through the bolt hole, the stove front valve handle through hole and the nut groove in sequence and is screwed with the nut, so as to be compatibly installed and fixed on the stove front valve of various sizes.

[0021] A working method of a gas pipeline switch forgetting alarm, comprising the following steps:

[0022] 1) the alarm is fastened on the stove front valve through the bolt passing through the fixed mounting block, the stove front valve handle and the movable mounting block, the position of the horizontal and vertical pipe installation adjustment slider is adjusted according to the horizontal and vertical pipe form of the gas pipeline, and the position of the inclined switch is adjusted to be 45 degrees downward to the horizontal line;

[0023] 2) the gas user opens the stove front valve of the gas stove counterclockwise, the angle of the inclined switch is 45 degrees upward to the horizontal line, the inclined switch is conducted, and the alarm circuit is powered on;

[0024] 3) Circuit power on self-check: the piezoelectric buzzer of the alarm will ring for 2S self-check, the digital pyroelectric sensor will detect that someone is present, the piezoelectric buzzer will stop ringing immediately, and enter the real-time sensing monitoring state of personnel;

[0025] 4) After the gas user finishes using gas, the stove front valve is closed, the angle of the tilt switch is restored to 45 degrees downward to the horizontal line, the tilt switch is turned off, and the alarm circuit is powered off to stop working;

[0026] 5) When the gas user uses gas or after finishing using gas, the stove front valve is not closed, and the personnel leave the kitchen, when the leaving time exceeds the delay time set by the alarm for sensing personnel, the alarm will ring to remind the gas user to close the stove front valve in time.

[0027] A circuit structure of a gas pipeline switch forgetting alarm, comprising a digital pyroelectric sensor sensing circuit and a piezoelectric buzzer alarm circuit, the digital pyroelectric sensor sensing circuit is provided with a digital pyroelectric sensor, a tilt switch and a PMOS tube Q1, the digital pyroelectric sensor is connected with the tilt switch and the PMOS tube Q1, the output end VBB of the PMOS tube Q1 is connected with the piezoelectric buzzer alarm circuit, for turning on the tilt switch and controlling the PMOS tube Q1 to power on the piezoelectric buzzer alarm circuit through the REL pin after the digital pyroelectric sensor senses no one for a long time.

[0028] The piezoelectric buzzer alarm circuit comprises a first comparator U2-A and a second comparator U2-B, the second comparator U2-B is connected with the first comparator U2-A through a diode D1, and two piezoelectric buzzers are connected in parallel at the output end of the first comparator U2-A.

[0029] The present application has the following beneficial effects:

[0030] The gas pipeline switch forgetting alarm designed in the present application is directly installed on the handle of the stove front valve, rotates with the stove front valve switch, detects the opening state of the stove front valve through the tilt switch, and alarms in cooperation with the digital pyroelectric sensor to monitor whether there is personnel in the kitchen, the stove front valve is opened, and the personnel are absent for a long time to alarm, prompting the user to close the valve, from the root cause to prevent the occurrence of gas accidents, and avoid the alarm after the gas leak; the alarm structure is simple and ingenious, equivalent to installing a handle on the stove front valve, simple to install, can adapt to different stove front valve structures, saves labor when rotating the valve, increases the overall beauty of the valve, the design of the circuit adopts cheap electrical components, the overall cost is low, and only when the valve is opened, the tilt switch opens the alarm power supply to work, the alarm is not powered when the valve is closed, more energy-saving, improves the service life, and uses a single button battery power supply, convenient to replace. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1It is the overall structure diagram of the gas pipeline switch forgetting alarm Figure 1 .

[0032] Figure 2 It is the overall structure diagram of the gas pipeline switch forgetting alarm Figure 2 .

[0033] Figure 3 It is the exploded view of the gas pipeline switch forgetting alarm.

[0034] Figure 4 It is the structure diagram of the vertical pipe installation state of the gas pipeline switch forgetting alarm.

[0035] Figure 5 It is the structure diagram of the horizontal pipe installation state of the gas pipeline switch forgetting alarm.

[0036] Figure 6 It is the base structure diagram of the horizontal and vertical pipe installation adjustment slider in the horizontal pipe installation state.

[0037] Figure 7 It is the structure diagram of the base.

[0038] Figure 8 It is the connection structure diagram of the button cell in the battery compartment.

[0039] Figure 9 It is the structure diagram of the battery compartment.

[0040] Figure 10 It is the circuit structure diagram of the digital pyroelectric sensor sensing circuit.

[0041] Figure 11 It is the circuit structure diagram of the piezoelectric buzzer alarm circuit.

[0042] Figure 12 It is the oscillation signal cycle frequency table of the piezoelectric buzzer alarm circuit.

[0043] Figure 13 It is the discharge curve diagram of the button cell.

[0044] In the figure: 1-alarm, 1.1-upper cover, 1.2-base, 1.3-fixed installation block, 1.4-movable installation block, 1.5-slotted guide, 1.6-bolt hole, 1.7-nut slot, 1.8-inclined switch, 1.9-horizontal and vertical pipe installation adjustment track, 1.10-horizontal and vertical pipe installation adjustment slider, 1.11-horizontal and vertical pipe installation adjustment slot, 1.12-circuit board, 1.13-digital pyroelectric sensor, 1.14-Fresnel lens, 1.15-piezoelectric buzzer, 1.16-button cell, 1.17-battery compartment, 1.18-circuit board fixing track, 1.19-upper cover inclined clamping block, 1.20-circuit board fixing column, 1.21-spring piece device;

[0045] 2-Stove valve; 3-Stove valve handle; 4-Gas pipe; 5-Hose connector. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0047] like Figures 1-13 As shown, a gas pipeline switch left-on alarm includes an alarm 1 and a gas valve 2. The alarm 1 is installed on the gas valve handle 3 of the gas valve 2, and the gas valve 2 is installed on the gas pipeline 4 (e.g., Figures 4-5 As shown, the end of the gas stove valve 2 is equipped with a hose connector 5, on which a hose is installed and connected to the gas stove. The alarm 1 has an upper cover 1.1 and a base 1.2. The upper cover 1.1 is snapped onto the base 1.2. The base 1.2 has upper cover tilting blocks 1.19 on both sides for snapping the upper cover 1.1 onto the base 1.2. Two fixed mounting blocks 1.3 are installed at the bottom of the base 1.2. The base 1.2 with the fixed mounting blocks 1.3 opposite to them has a sliding groove 1.5. The sliding groove 1.5 is slidably connected to the movable mounting block 1.4. The fixed mounting block 1.3 has a bolt hole 1.6. The movable mounting block 1.4 has a nut groove 1.7 opposite to it. The bolt passes through the bolt hole 1.6, the through hole of the gas stove valve handle 3, and the nut groove 1.7 in sequence and is threaded with a nut. The nut is limited in the nut groove 1.7, so that the alarm 1 is firmly installed on the gas stove valve 2. The movable mounting structure can be compatible with the installation and fixing of gas stove valves 2 of various sizes.

[0048] The alarm 1 is further provided with a tilt switch 1.8, a horizontal and vertical pipe installation adjustment track 1.9, a horizontal and vertical pipe installation adjustment slider 1.10, a horizontal and vertical pipe installation adjustment slot 1.11, a circuit board 1.12, a digital pyroelectric sensor 1.13, a Fresnel lens 1.14, a piezoelectric buzzer 1.15, a button cell 1.16, a battery compartment 1.17, a circuit board fixing track 1.18, an upper cover tilt clamping block 1.19, and a circuit board fixing column 1.20, the middle part of the base 1.2 is provided with the circuit board 1.12, the circuit board 1.12 is provided with the digital pyroelectric sensor 1.13 and two piezoelectric buzzers 1.15, the base 1.2 is provided with the battery compartment 1.17 below one side of the circuit board 1.12, the base 1.2 is provided with the circuit board fixing track 1.18 on both sides of the upper part, the circuit board 1.12 is installed on the circuit board fixing track 1.18 through the circuit board fixing column 1.20, the circuit board fixing track 1.18 is clamped with the battery compartment 1.17, the button cell 1.16 is installed in the battery compartment 1.17, the positive electrode of the button cell 1.16 is in contact with the front spring device 1.21, and the negative electrode of the button cell 1.16 is in contact with the battery negative electrode contact point welded at the bottom of the circuit board 1.12.

[0049] The base 1.2 is provided with the horizontal and vertical pipe installation adjustment track 1.9 below the other side of the circuit board 1.12, the horizontal and vertical pipe installation adjustment track 1.9 adopts a 1 / 4 circular arc, the horizontal and vertical pipe installation adjustment slider 1.10 is slidably connected in the horizontal and vertical pipe installation adjustment track 1.9, the tilt switch 1.8 is installed on the horizontal and vertical pipe installation adjustment slider 1.10, and the metal pin of the tilt switch 1.8 is connected with the circuit board 1.12.

[0050] The upper cover 1.1 is provided with the horizontal and vertical pipe installation adjustment slot 1.11, a pyroelectric sensor through hole and two buzzer through holes, the digital pyroelectric sensor 1.13 passes out of the pyroelectric sensor through hole, the head of the digital pyroelectric sensor 1.13 is provided with the Fresnel lens, the two piezoelectric buzzers 1.15 pass out of the buzzer through holes to emit alarm sound, and the horizontal and vertical pipe installation adjustment slider 1.10 is driven in the horizontal and vertical pipe installation adjustment slot 1.11 to slide in the horizontal and vertical pipe installation adjustment track 1.9, so that the alarm 1 is adjusted and installed on the horizontal pipe stove front valve 2 or the vertical pipe stove front valve 2 when the horizontal and vertical pipe installation adjustment slider 1.10 is located at both ends of the horizontal and vertical pipe installation adjustment track 1.9.

[0051] The working principle of the alarm 1 is as follows:

[0052] I. Using the tilt switch 1.8, combined with the characteristics of the stove valve 2 rotation, the alarm 1 is fixed on the stove valve 2, when the valve is opened, the tilt switch 1.8 is turned on to make the alarm 1 circuit power on, when the valve is closed, the alarm 1 circuit is powered off, realizing the synchronization of the switch valve and the switch circuit, and the shortest working time of the alarm, saving the battery power.

[0053] The gas pipeline 4 includes horizontal pipe and vertical pipe, the horizontal pipe type gas pipeline 4 is installed with horizontal pipe stove valve 2, the horizontal pipe stove valve 2 is installed obliquely or vertically with the horizontal plane, the vertical pipe type gas pipeline 4 is installed with vertical pipe stove valve 2. When the alarm 1 is installed on the vertical pipe stove valve 2, the horizontal and vertical pipe installation adjustment slider 1.10 is pushed to the lowermost end of the 1 / 4 arc right horizontal placement. When the alarm 1 is installed on the horizontal pipe stove valve 2, the horizontal and vertical pipe installation adjustment slider 1.10 is pushed to the uppermost end of the 1 / 4 arc right horizontal placement.

[0054] When the stove valve 2 is rotated to be parallel to the gas pipeline 4, it is in the open state, and when it is rotated to be perpendicular to the gas pipeline 4, it is in the closed state. When the alarm 1 is installed on the vertical gas pipeline 4 stove valve 2, the horizontal and vertical pipe installation adjustment slider 1.10 is pushed to slide the tilt switch 1.8 on the horizontal and vertical pipe installation adjustment track 1.9 to the vertical pipe installation position, when the stove valve 2 is closed, the tilt switch 1.9 is about 45 degrees downward to the horizontal line, the alarm 1 is powered off and does not work, when the stove valve 2 is opened, the tilt switch 1.8 is about 45 degrees upward to the horizontal line, the alarm 1 is powered on and starts to work. When the alarm 1 is installed on the horizontal gas pipeline 4 stove valve 2, the horizontal and vertical pipe installation adjustment slider 1.10 is pushed to slide the tilt switch 1.8 on the horizontal and vertical pipe installation adjustment track 1.9 to the horizontal pipe installation position, by the same reason, when the stove valve 2 is closed, the tilt switch 1.8 is about 45 degrees downward to the horizontal line, the alarm 1 is powered off and does not work, when the stove valve 2 is opened, the tilt switch 1.8 is about 45 degrees upward to the horizontal line, the alarm 1 is powered on and starts to work. In addition, if the horizontal pipe installation stove switch rotation surface is parallel to the ground, professional personnel is needed to adjust the angle of the stove valve 2 switch rotation surface, so that it is inclined or perpendicular to the ground, so that the tilt switch 1.8 can work normally.

[0055] II. The model of the human body infrared sensing low-power digital pyroelectric sensor 1.13 adopts RDB226-S or RDA226S-F, which detects whether there is personnel in the kitchen, and does not alarm in the case of opening the stove valve 2 and there being personnel in the kitchen, in the case of no personnel in the kitchen and opening the stove valve 2, such as Figure 10As shown, the delay time of the REL pin output high level exceeding the setting of the digital pyroelectric sensor 1.13, the REL pin is converted from high level to low level, the PMOS tube Q1 is turned on, and the piezoelectric buzzer alarm circuit is powered by VBB, which will emit an alarm sound signal. The delay time of the REL pin output high level is set by the resistance value of R3, which is about 15 minutes when R3 is 750K. The digital pyroelectric sensor 1.13 produced by Weisheng Technology has a thermal engine function. After the RDB226-S is powered on, the REL pin outputs high level for 10 seconds and low level for 2 seconds, and then normal detection is performed. After the RDA226S-F is powered on, the REL pin outputs high level for 2 seconds and low level for 2 seconds, and then normal detection is performed. Therefore, the alarm device using RDA226S-F also has a thermal engine self-checking function. After the stove front switch is turned on, a 2-second self-checking sound will be emitted. As long as the activity of the personnel in the kitchen can be sensed, the sound will not be emitted. In the case of forgetting to turn off the stove front valve, after the personnel in the kitchen leave for more than 15 minutes, the alarm 1 will continuously emit an alarm sound. In addition, a sliding switch can be designed on the shell of the alarm 1. By setting different resistance values of R3 through the switch, different delay times for alarm can be adjusted to achieve the effect of considering different gas use habits of different users.

[0056] III. A low-power sound alarm circuit is designed using a piezoelectric buzzer 1.15. A low-power dual operational amplifier such as LM358 is used to design an oscillation signal generation circuit to drive the piezoelectric buzzer 1.15 to emit sound. The dual operational amplifier is of rail-to-rail type, which improves the output signal voltage to increase the sound level of the alarm sound. In combination with the frequency of the buzzer cavity of the piezoelectric buzzer 1.15 produced by the piezoelectric buzzer sheet, the frequency of the alarm circuit sound is designed to achieve the effect of resonance of the buzzer sheet frequency and the buzzer cavity frequency, achieving the maximum alarm sound level.

[0057] Both operational amplifiers of LM358 work as comparators. The first comparator U2-A is designed as a positive feedback RC charging and discharging oscillation circuit to generate a 1KHz or so oscillation signal close to a square wave. The other operational amplifier U2-B in this circuit can be used as a follower. The rail-to-rail operational amplifier can output a voltage close to the power supply voltage, which is used as an output driver to drive the piezoelectric buzzer 1.15 to emit sound for a long time, which can achieve the maximum output level of the alarm. The power consumption of a single piezoelectric buzzer under 3V voltage is very small, about 20uA. This design connects multiple piezoelectric buzzers in parallel to achieve the effect of doubling the alarm sound level.

[0058] In addition, as Figure 11As shown, U2-B can also be designed as an oscillation circuit of about 1Hz. The low-frequency oscillation signal output by U2-B controls the oscillation capacitor C1 to oscillate periodically at a frequency of 1Hz through diode D1. The alarm sound is improved from a continuous beep to an intermittent beeping pattern with intervals of about 0.5s (half a cycle of the 1Hz signal), thereby improving the recognizability of the alarm sound.

[0059] Furthermore, the program logic of the digital pyroelectric sensor 1.13 can be customized to make its REL pin output mode conform to the application design of the alarm. After the delay time of the high level of the REL pin, a 1KHz signal with a 0.5s interval is directly output to directly drive the piezoelectric buzzer 1.15 to sound, achieving the most concise and stable circuit design while achieving the lowest product hardware cost.

[0060] The formula for calculating the oscillation frequency of the comparator positive feedback RC charging and discharging oscillation circuit is as follows (taking the U2-A oscillation circuit as an example):

[0061] RC charge / discharge time constant τ=R6*C1;

[0062] The voltage Ut of capacitor C1 when the threshold of the oscillation circuit flips is Ut = R4 / (R4+R5) = 1 / 2VBB;

[0063] Set the initial voltage of capacitor C1 as Uc(t1) = R5 parallel R7 / (R4 + R5 parallel R7) = 1 / 3VBB;

[0064] The termination voltage of capacitor C1 is Uc(t2) = R4 parallel R7 / (R5 + R4 parallel R7) = 2 / 3VBB;

[0065] The expression for the capacitor voltage of capacitor C1 when it is charged from time t1 to time t2 (half a signal cycle) is:

[0066] Let Δt = t2 - t1 = T / 2, and substituting the parameters into the above formula, we get the circuit oscillation signal period T = 2R6C1ln2, and the frequency... (like Figure 12 (As shown).

[0067] The oscillation frequency of this circuit is designed to be close to 1.5Hz and 1.5KHz.

[0068] IV. Powered by a single CR20323V button cell battery (1.16V), the voltage range of the key components is fully compliant: LMV358CDRG: +2.1V~+5.5V, RDB226-S: +1.5~+4.5V, RDA226S-F: +2.2~+5.0V. The minimum operating voltage of this alarm can be roughly set to 2.5V.

[0069] The total current consumption of the alarm 1 is about 13 uA when the circuit is powered on and the digital pyroelectric sensor 1.13 is working, and about 133 uA when the piezoelectric buzzer alarm circuit is working. Assuming that the non-alarm working power consumption is calculated based on 3 hours of cooking and boiling water per day, and the alarm working power consumption is calculated based on 2 times of forgetting to turn off the valve alarm per day, each time for 1 minute, the single battery can be used for the alarm 1 for a conservative estimate of the length of time.

[0070] The daily power consumption W is 13 uA*3h+133 uA*2*1min / 60=43.4 uAh;

[0071] The nominal capacity of a conventional CR2032 battery is 230 mAh (milliampere-hour) at 20 degrees Celsius and 15KΩ, and the time consumption is 1200 hours, as shown in the discharge curve graph. Figure 13 As shown in the discharge curve graph, it takes 1100 hours for the battery to drop to the minimum working voltage of the alarm 1, which is 2.5V. It is estimated that the capacity of the battery in the interval above 2.5V is 230mAh*1100h / 1200h≈210mAh;

[0072] Therefore, the working time of the alarm 1 can be about 4839h, which is about 200 days, about 6.7 months, and it is estimated that the battery should be replaced every half year to ensure the normal working of the alarm 1.

[0073] The pads on the back of the circuit board 1.12 (with slight protrusions after tinning) are directly used as the negative contact points of the battery, and only one contact spring device 1.21 that contacts the positive electrode on the side of the battery is used for the installation of the battery, which achieves the effect of convenient product assembly and production while effectively controlling the cost of circuit devices, as shown in Figures 8-9 .

[0074] As shown in Figure 3 , 6 -9, the assembly steps of the alarm 1 are as follows:

[0075] 1) The upper cover 1.1 and the base 1.2 are designed with interlocking clamping groove structures for assembly and installation, and the overall structure is clamped and fixed;

[0076] 2) The base 1.2 is designed with circuit board fixing tracks 1.18 on both sides to hold and fix the circuit board 1.12, and the holding height is consistent with the thickness of the CR2032 button battery 1.16;

[0077] 3) The upper cover 1.1 is designed to be installed with the height of the top of the piezoelectric buzzer 1.15 on the circuit board 1.12, and the upper cover 1.1 and the two circuit board fixing columns 1.20 of the base 1.2 together realize the fixation of the circuit board 1.12 in the up-down and left-right directions;

[0078] 4) Inclined switch 1.8 metal pin welding in circuit board 1.12 middle line position, inclined switch 1.8 installed in horizontal and vertical pipe installation adjustment slider 1.10 inner hole, sliding in the arc groove in horizontal and vertical pipe installation adjustment rail 1.9, to achieve the adjustment of the angle between inclined switch 1.8 and the horizon.

[0079] 5) Battery compartment 1.17 sliding in the circuit board fixed rail 1.18 protruding on both sides of the base 1.2, to achieve the push-pull installation function of CR2032 button cell 1.16, and designed with elastic buckle, and the battery compartment 1.17 installation gap of the upper cover 1.1 to achieve position fixation after installation.

[0080] As shown in Figures 4-5 The installation steps of the alarm 1 are as follows:

[0081] 1) The fixed mounting block 1.3 and the movable mounting block 1.4 are clamped on the stove valve handle 3 of the stove valve 2;

[0082] 2) A pair of nuts are installed in the hexagonal nut groove 1.7 on a pair of movable mounting blocks 1.4;

[0083] 3) A pair of studs are passed through the bolt hole 1.6 of the fixed mounting block 1.3, through the nut, and tightened, i.e. the alarm 1 is tightly fixed on the stove valve 2;

[0084] 4) For other structure form of valve switch, remove the installation fixing structure (fixed mounting block 1.3 and movable mounting block 1.4) in this design, and design the corresponding installation fixing structure.

[0085] A working method of a gas pipeline switch forgetting alarm, comprising the following steps:

[0086] 1) The alarm 1 is fastened on the stove valve 2 by passing through the fixed mounting block 1.3, the stove valve handle 3 and the movable mounting block 1.4, and the position of the horizontal and vertical pipe installation adjustment slider 1.10 is adjusted according to the horizontal and vertical pipe form of the gas pipeline 4, and then the position of the inclined switch 1.8 is adjusted to be 45 degrees downward to the horizontal line;

[0087] 2) The gas user opens the stove valve 2 of the gas stove counterclockwise, the angle of the inclined switch 1.8 is 45 degrees upward to the horizontal line, the inclined switch 1.8 is turned on, and the alarm 1 circuit is powered on;

[0088] 3) Circuit power-on self-check: the piezoelectric buzzer 1.15 of the alarm 1 will first sound for 2S self-check, and the digital pyroelectric sensor 1.13 will sense that someone is present, and the piezoelectric buzzer 1.15 will immediately stop sounding, and enter the real-time personnel sensing monitoring state;

[0089] 4) gas user after the gas is used up, close the stove front valve 2, tilt switch 1.8 angle to restore to 45 degrees down from the horizontal line, tilt switch 1.8 is disconnected, alarm 1 circuit power off stop working;

[0090] 5) gas user uses gas or after the gas is used up, without closing the stove front valve 2, and personnel leave the kitchen, when the time away from the alarm 1 set delay time after the alarm 1 will emit a ringing alarm, remind the gas user to close the stove front valve 2 in time.

[0091] The present application is not limited to the above-mentioned embodiments, any person should know that the structural changes made under the inspiration of the present application, any technical solution with the same or similar to the present application, fall within the scope of the present application.

[0092] The technology, shape, structure part not described in detail in the present application are all known technology.

Claims

1. A gas pipeline switch left-on alarm, characterized in that, The device includes an alarm and a stove valve. The alarm is installed on the handle of the stove valve. The alarm has a top cover, a base, a tilt switch, a digital pyroelectric sensor, and a piezoelectric buzzer. The top cover is snapped onto the base. A circuit board is installed in the middle of the base. The circuit board has a digital pyroelectric sensor and two piezoelectric buzzers. A battery compartment is installed on the base and below one side of the circuit board. A horizontal and vertical tube mounting adjustment track is installed on the base and below the other side of the circuit board. The horizontal and vertical tube mounting adjustment track adopts a 1 / 4 arc. A horizontal and vertical tube mounting adjustment slider is slidably connected inside the horizontal and vertical tube mounting adjustment track. A tilt switch is installed on the horizontal and vertical tube mounting adjustment slider. The metal pin of the tilt switch is connected to the circuit board. The base has tilting blocks on both sides for the cover to be snapped onto the base. The digital pyroelectric sensor passes through the pyroelectric sensor through hole. A Fresnel lens is installed on the head of the digital pyroelectric sensor to monitor whether there are people near the gas pipeline. The upper cover is equipped with a horizontal and vertical tube installation adjustment slot, a pyroelectric sensor through hole and a buzzer through hole at the matching position. The horizontal and vertical tube installation adjustment slider is moved in the horizontal and vertical tube installation adjustment track to adjust the horizontal and vertical tube installation adjustment slider to be located at both ends of the horizontal and vertical tube installation adjustment track. The alarm adapter is installed on the horizontal tube stove front valve or the vertical tube stove front valve. The base has two fixed mounting blocks installed at its bottom. The fixed mounting blocks have grooves at their opposite positions, and the movable mounting blocks are slidably connected in the grooves. The fixed mounting blocks have bolt holes, and the movable mounting blocks have nut grooves at their opposite positions. The bolts pass through the bolt holes, the through holes of the stove valve handle, and the nut grooves in sequence and are threaded onto the nuts, so as to be compatible with the installation and fixing of stove valves of various sizes.

2. The gas pipeline switch-forgot alarm according to claim 1, characterized in that, The gas inlet valve is installed on the gas pipeline, which includes horizontal and vertical types. Horizontal gas inlet valves are installed on horizontal gas pipelines, and are installed at an angle or perpendicular to the horizontal plane. Vertical gas inlet valves are installed on vertical gas pipelines.

3. The gas pipeline switch-forgot alarm according to claim 2, characterized in that, When the alarm is installed on the vertical pipe stove valve, the horizontal and vertical pipe installation adjustment slider is moved to the bottom of the horizontal position with 1 / 4 arc facing right. When the vertical pipe stove valve is closed, the tilt switch is 45 degrees downward with the horizontal line. When the vertical pipe stove valve is opened counterclockwise, the tilt switch is 45 degrees upward with the horizontal line and the alarm is powered on. When installing the alarm on the horizontal tube stove valve, move the horizontal and vertical tube installation adjustment slider to the top of the horizontally placed 1 / 4 arc to the right. When the horizontal tube stove valve is closed, tilt the switch downwards at a 45-degree angle to the horizontal line. When the horizontal tube stove valve is opened counterclockwise, tilt the switch upwards at a 45-degree angle to the horizontal line, and the alarm will be powered on.

4. The gas pipeline switch-forgot alarm according to claim 1, characterized in that, The upper two sides of the base are provided with circuit board fixing rails. The circuit board is installed on the circuit board fixing rails by circuit board fixing posts. The battery compartment is snapped into the inside of the circuit board fixing rails. A button battery is installed in the battery compartment. The positive terminal of the button battery contacts the front spring device, and the negative terminal of the button battery contacts the battery negative terminal contact point soldered to the bottom of the circuit board.

5. The gas pipeline switch-forgot alarm according to claim 1, characterized in that, The circuit board is equipped with a gas pipeline switch left-on alarm circuit structure, which includes a digital pyroelectric sensor sensing circuit and a piezoelectric buzzer alarm circuit. The digital pyroelectric sensor sensing circuit is equipped with a digital pyroelectric sensor, a tilt switch and a PMOS transistor. The digital pyroelectric sensor is connected to the tilt switch and the PMOS transistor. The output terminal of the PMOS transistor is connected to the piezoelectric buzzer alarm circuit, which is used to turn on the tilt switch and, after the digital pyroelectric sensor senses no one for a timeout, use its REL pin to control the PMOS transistor to power the piezoelectric buzzer alarm circuit. The piezoelectric buzzer alarm circuit includes a first comparator and a second comparator. The second comparator is connected to the first comparator through a diode, and two piezoelectric buzzers are connected in parallel at the output of the first comparator.

6. The working method of the gas pipeline switch-forgot alarm according to any one of claims 1-5, characterized in that, Includes the following steps: 1) Secure the alarm to the gas valve by passing it through the fixed mounting block, the gas valve handle, and the movable mounting block. Adjust the position of the horizontal and vertical pipe mounting sliders according to the horizontal and vertical pipe configuration of the gas pipeline, and then adjust the position of the tilt switch to be 45 degrees downward from the horizontal line. 2) Gas users open the gas stove's in-stove valve counterclockwise, tilting the switch at a 45-degree angle upwards to activate the alarm circuit. 3) Circuit power-on self-test: The piezoelectric buzzer of the alarm will sound for 2 seconds for self-test. When the digital pyroelectric sensor detects that someone is there, the piezoelectric buzzer will immediately stop sounding and enter the real-time personnel sensing and monitoring state. 4) After gas users finish using gas, they close the valve in front of the stove, and the tilt switch returns to a 45-degree downward angle with the horizontal line. The tilt switch is disconnected, and the alarm circuit is de-energized and stops working. 5) If a gas user leaves the kitchen without turning off the gas valve when using gas or after using gas, the alarm will sound after the time exceeds the delay time set by the alarm to remind the gas user to turn off the gas valve in time.

Images