CN208634478U - A kind of gas valve automatic shutdown circuit based on RC delay - Google Patents
A kind of gas valve automatic shutdown circuit based on RC delay Download PDFInfo
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- CN208634478U CN208634478U CN201820759342.5U CN201820759342U CN208634478U CN 208634478 U CN208634478 U CN 208634478U CN 201820759342 U CN201820759342 U CN 201820759342U CN 208634478 U CN208634478 U CN 208634478U
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- circuit
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- potentiometer
- triode
- delay
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Abstract
The utility model provides a kind of gas valve automatic shutdown circuit based on RC delay, which is made of human body infrared detection circuit, RC charge and discharge delay circuit and relay drive circuit.When circuit detects that someone carries out operation to gas utensil, circuit is in normal operating conditions, and gas valve is opened.Be delayed circuit start timing when detecting unmanned operation, if detect that the time of unmanned operation is more than the preset time, system thinks that user has forgotten turn out the gas, and circuit start solenoid valve for gas cuts off coal gas.This circuit can be used to implement the situation for forgetting to close fire in burner use process.
Description
Technical field
The utility model relates to a kind of gas valve automatic shutdown circuits based on RC delay, belong to application electric technology neck
Domain.
Background technique
Due to containing the ingredients such as toxic imflammable gas carbon monoxide in coal gas, if in the coal gas that improper use can cause
The accidents such as poison, gas explosion, fire.Accelerate people with the rhythm of life of modern people and often forgets turn out the gas due to busy
Valve and cause to leak, or have forgotten Guan Huoer in the prolonged gas-cooker use process such as stew, decoct medicinal herbs and lead to fire
Etc. accidents.The gas leakage alarm of existing market, mainly by the leakage of sensor detection gas and then cutting-off valve, but simultaneously
Do not have detection burner to forget to close the such situation of fire in use.
Utility model content
The purpose of the utility model is to provide a kind of gas valve automatic shutdown circuits based on RC delay, for realizing combustion
Forget to close fiery situation in tool use process.
The specific technical solution that the utility model is taken is as follows:
A kind of gas valve automatic shutdown circuit based on RC delay, it is characterized in that: the circuit includes human body infrared induction
Head HC-SR501, capacitor C1, potentiometer RV1, resistance R1, protection diode D1, NPN triode Q1 and Q2,5V relay.Its
1 foot of middle human body infrared inductive head connects 5V power supply, 2 feet ground connection, and 3 foot OUT terminals are connected to the base stage of (8050) NPN triode Q2；Three
The collector of pole pipe Q2 is connected to the "+" end of capacitor C1, emitter ground connection；Capacitor C1 "+" terminates to one end of 10M potentiometer RV1,
"-" end ground connection, the other end 5V power supply of potentiometer RV1；One end of resistance R1 is connected to potentiometer RV1 center tap terminal, separately
One end is connected to the base stage of triode Q1；The cathode of diode D1 connects 5V power supply, and anode is connected to the collector of triode Q1；Three poles
The emitter of pipe Q1 is grounded；One end of inductance coil input terminal of relay RL1 is connected to VCC, another collection for terminating to triode Q1
Electrode, the output of relay RL1 terminate to coal gas braking electromagnetic valve.
The utility model has the following beneficial effects: the gas valve automatic shutdown circuit based on RC delay, passes through infrared induction
Head detection human body, circuit be in normal operating conditions, the unlatching of coal gas braking valve when someone, and gas utensil is in normal use
State.If human body is not detected in gas utensil in the use process of (0 to 3 hours settable) for a long time, circuit start is protected safely
Shield operation cutting gas valve, to avoid the accidents such as gas leak and fire.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of the gas valve automatic shutdown circuit based on RC delay of this patent.
Specific embodiment
The utility model is described further with reference to the accompanying drawing.
As shown in Figure 1, a kind of gas valve automatic shutdown circuit based on RC delay, which includes human body infrared induction
Head HC-SR501, capacitor C1, potentiometer RV1, resistance R1, protection diode D1, NPN triode Q1 and Q2,5V relay.Its
1 foot of middle human body infrared inductive head connects 5V power supply, 2 feet ground connection, and 3 foot OUT terminals are connected to the base stage of (8050) NPN triode Q2；Three
The collector of pole pipe Q2 is connected to the "+" end of capacitor C1, emitter ground connection；Capacitor C1 "+" terminates to one end of 10M potentiometer RV1,
"-" end ground connection, the other end 5V power supply of potentiometer RV1；One end of resistance R1 is connected to potentiometer RV1 center tap terminal, separately
One end is connected to the base stage of triode Q1；The cathode of diode D1 connects 5V power supply, and anode is connected to the collector of triode Q1；Three poles
The emitter of pipe Q1 is grounded；One end of inductance coil input terminal of relay RL1 is connected to VCC, another collection for terminating to triode Q1
Electrode, the output of relay RL1 terminate to coal gas braking electromagnetic valve.
System work is made of RC charge and discharge delay circuit capacitor C1 and potentiometer RV1, and RV1 is using 10M Ω's in circuit
Potentiometer, C1 use the electrolytic capacitor of 2000UF, and the fully charged time T of C1 capacitor can by formula T=1.1 × RV1 × C1
Know to be 0 to 22000 seconds, the triode ON when capacitor C1 '+' anode voltage is more than 0.7V when, relay coil is powered output
Switch is attracted, the braking of coal gas braking electromagnetic valve.During normal use gas utensil, human body infrared inductive head HC-SR501 inspection
Its 3 foot of output pin of human body output high level, triode Q2 conducting are measured, its "+" end voltage of capacitor C1 repid discharge at this time is lower than
0.7V, triode Q1 cut-off, solenoid valve for gas door do not work, and gas utensil can be used normally.When nobody operation before burner,
The output pin 3 of human body infrared inductive head HC-SR501 is low level triode Q2 cut-off, RC delay circuit starting, when for a long time
RC circuit persistently charges to capacitor C1 when unmanned operation, when C1 "+" end voltage is more than 0.7V triode Q1 conducting, relay
Device RL1 is attracted solenoid valve for gas work, to realize that gas valve is automatically cut off.It can be by adjusting potentiometer RV1 in circuit
Resistance value adjust delay time.
Claims (2)
1. a kind of gas valve automatic shutdown circuit based on RC delay, it is characterized in that: the circuit includes human body infrared inductive head
HC-SR501, capacitor C1, potentiometer RV1, resistance R1, protection diode D1, NPN triode Q1 and Q2,5V relay；Wherein
1 foot of human body infrared inductive head connects 5V power supply, 2 feet ground connection, and 3 foot OUT terminals are connected to the base stage of (8050) NPN triode Q2；Three poles
The collector of pipe Q2 is connected to the "+" end of capacitor C1, emitter ground connection；Capacitor C1 "+" terminates to one end of 10M potentiometer RV1,
"-" end ground connection, the other end 5V power supply of potentiometer RV1；One end of resistance R1 is connected to potentiometer RV1 center tap terminal, separately
One end is connected to the base stage of triode Q1；The cathode of diode D1 connects 5V power supply, and anode is connected to the collector of triode Q1；Three poles
The emitter of pipe Q1 is grounded；One end of inductance coil input terminal of relay RL1 is connected to VCC, another collection for terminating to triode Q1
Electrode, the output of relay RL1 terminate to coal gas braking electromagnetic valve.
2. a kind of gas valve automatic shutdown circuit based on RC delay according to claim 1, the potentiometer in circuit
RV1 resistance value uses 10M Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820759342.5U CN208634478U (en) | 2018-05-17 | 2018-05-17 | A kind of gas valve automatic shutdown circuit based on RC delay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820759342.5U CN208634478U (en) | 2018-05-17 | 2018-05-17 | A kind of gas valve automatic shutdown circuit based on RC delay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208634478U true CN208634478U (en) | 2019-03-22 |
Family
ID=65732097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820759342.5U Expired - Fee Related CN208634478U (en) | 2018-05-17 | 2018-05-17 | A kind of gas valve automatic shutdown circuit based on RC delay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208634478U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109989655A (en) * | 2019-04-03 | 2019-07-09 | 亚萨合莱自动门系统有限公司 | Automatic door operator and its driving method |
-
2018
- 2018-05-17 CN CN201820759342.5U patent/CN208634478U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109989655A (en) * | 2019-04-03 | 2019-07-09 | 亚萨合莱自动门系统有限公司 | Automatic door operator and its driving method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190322 Termination date: 20200517 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |