CN214148010U

CN214148010U - Igniter with dry-burning-prevention pulse igniter temperature control probe

Info

Publication number: CN214148010U
Application number: CN201922057884.5U
Authority: CN
Inventors: 谭忠泽; 盛建荣; 周新宁; 黄浩
Original assignee: Nanjing Source Rich Industrial Co ltd
Current assignee: Nanjing Source Rich Industrial Co ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2021-09-07
Anticipated expiration: 2029-11-25

Abstract

An igniter provided with a dry-burning-prevention pulse igniter temperature control probe comprises a relay, an ignition circuit, a dry-burning temperature control probe resistor, a thermocouple electromagnetic valve, a first comparator detection circuit, a second comparator detection circuit, a first switch circuit, a second switch circuit, a relay and a third switch circuit, wherein the direction of current flowing through the electromagnetic valve is opposite to the direction of current generated by the thermocouple, and the relay is a double-contact relay; the two input ends of a first comparator detection line are respectively connected with a dry-burning temperature control probe resistor and a comparison divider resistor, the input end of a second comparator detection line is respectively connected with the amplified output of the divider circuit and the first comparator, and the output end of the second comparator is connected with an amplifier and an amplifier output switching valve emitter amplifying circuit; the first switch circuit is connected with an ignition control ignition circuit, and is connected in parallel with a circuit which respectively conducts a triode connected in series on a thermocouple solenoid valve coil and a relay double contact to convert the circuit into a transient circuit, namely, a dry burning point resistor is disconnected.

Description

Igniter with dry-burning-prevention pulse igniter temperature control probe

The technical field is as follows:

the utility model relates to a gas cooking utensils pulse ignition ware with prevent detection and thermocouple solenoid valve control circuit of dry combustion method pulse ignition ware temperature control probe belongs to gas cooking utensils pulse ignition controller field.

Background art:

the gas cooker with the dry burning prevention function is widely applied to the market, and the matched dry burning prevention pulse ignition controller does not have the detection function of detecting open-circuit faults such as disconnection, welding and damage of the temperature control probe, and the like.

The invention content is as follows:

the utility model aims at providing an igniter provided with a temperature control probe of an anti-dry burning pulse igniter, which is a gas cooker pulse igniter provided with a detection of the temperature control probe of the anti-dry burning pulse igniter and a control circuit of a thermocouple solenoid valve; the method and circuit for changing resistance value of detection test point by switching relay can use a group of voltage comparators to achieve detection of two completely different states on a temperature control probe, namely: the valve closing alarm can detect the valve closing alarm of dry burning overtemperature when the stove is burnt, and can automatically detect whether the temperature control probe is broken and is off-welded, damaged and other open circuit faults when the stove is ignited every time.

The technical scheme of the utility model is that: an igniter provided with a dry-burning-prevention pulse igniter temperature control probe comprises a relay, an ignition circuit, a dry-burning temperature control probe resistor, a thermocouple electromagnetic valve, a first comparator detection circuit, a second comparator detection circuit, a first switch circuit, a second switch circuit, a relay and a third switch circuit, wherein the direction of current flowing through the electromagnetic valve is opposite to the direction of current generated by the thermocouple, and the relay is a double-contact relay; the two input ends of a first comparator detection line are respectively connected with a dry-burning temperature control probe resistor and a comparison divider resistor, the input end of a second comparator detection line is respectively connected with the amplified output of the divider circuit and the first comparator, and the output end of the second comparator is connected with an amplifier and an amplifier output switching valve emitter amplifying circuit; the first switch circuit is connected with an ignition control ignition circuit, and is connected in parallel with a circuit which respectively conducts a triode connected in series on a thermocouple solenoid valve coil and a relay double contact to convert the circuit into a transient circuit, namely, the R2 dry burning point resistor is disconnected; the circuit for changing the resistance value of the test point of the first comparator by switching the electric appliance after transient state simultaneously comprises three paths of timing control electromagnetic valves for opening and closing the valve and an alarm circuit; when the stove is ignited, the relay circuit is switched on at the same time, the relay switches to change the resistance value circuit of the test point of the first comparator, and the comparator detects the circuit; and the device also comprises three paths of timing control electromagnetic valves for opening and closing and an alarm circuit.

The K1 transient state or normal state of the double contacts of the relay is respectively disconnected or connected with a dry-burning temperature control probe (thermistor) and is connected or disconnected with a Q1 emitting electrode of a second switching circuit, so that the Q1 is connected with the negative electrode of a power supply or disconnected; the K2 of the double contacts of the relay simultaneously switches on or off the amplifying circuit Q3 of the second comparator; when the temperature control probe is disconnected, desoldered, damaged and the like, and is opened (the resistance is infinite), the potential of the + end of the first comparator IC1 is higher than the-end, the first comparator IC1 immediately outputs high potential, so that the buzzer amplifier is conducted to be powered on; the first switch circuit is connected with an ignition control ignition circuit, and is connected in parallel with a circuit which respectively conducts a triode connected in series on a thermocouple solenoid valve coil and a relay double contact to convert the circuit into a transient circuit, namely, the R2 dry burning point resistor is disconnected.

The resistance values of the test points are changed at different positions by changing the contacts of the relays K1 and K2, and the temperature control probe realizes the alarm for detecting open-circuit faults such as disconnection, welding disconnection, damage and the like of the temperature control probe and the valve closing and alarm of the short circuit, dry burning over-temperature state of the connecting line of the temperature control probe by using a group of voltage comparators.

The constant current source is used for a single-coil thermocouple electromagnetic valve, and can also be used for a double-coil thermocouple electromagnetic valve pulse ignition controller and is provided with A, B, C three timing circuits, the output of the three timing circuits is connected with a control electrode of a first switch circuit, the output of the first switch circuit is connected with a control ignition circuit and a relay control circuit in parallel, wherein the A timing is set within 6-8 seconds, the rest B, C timing time is more than the A timing time for about several seconds, after any ABC timing circuit is started, the switch circuit is conducted, the high potential of the switch circuit is connected with a trigger end of the ignition circuit, the parallel high potential enables the relay to be attracted, the double contacts K1 and K2 of the relay are changed to the right, namely, a dry-burning temperature control probe (thermistor) is disconnected, a Q1 emitter is connected, the Q1 is connected with the negative electrode of a power supply, meanwhile, the connection between the Q3 and the output end of a second comparator is disconnected, and the temperature control probe is disconnected and desoldered when the temperature control probe is disconnected, When the circuit is opened (the resistance is infinity) due to damage, the voltage of the "+" end of the first comparator IC1 is higher than the voltage of the "-" end, the first comparator IC1 immediately outputs high voltage, so that Q1 and Q2 are conducted, and the Q5 is conducted through D3 to electrify the buzzer to send out alarm sound. If the temperature control probe has no open circuit faults such as disconnection, welding failure, damage and the like, when the resistance value of the temperature control probe is far less than 4.7M, the negative end potential of the comparator is higher than the output low potential of the positive end IC1, the Q1 and the Q2 are cut off and are not conducted, and the buzzer does not give an alarm. At this time, although the comparator IC1 outputs a low potential, the Q3 is not conducted and will not alarm because the base of Q3 is open.

The thermocouple electromagnetic valve closing valve adopts a method that emitter amplification circuits (Q10, Q11 and Q12) are simultaneously conducted and the current flowing direction of a coil of the electromagnetic valve is changed to push the electromagnetic valve to be pulled open for closing the electromagnetic valve effectively, and the emitter amplification circuits (three transistors Q10, Q11 and Q12) are connected in parallel between the coils of the electromagnetic valve, so that the valve can be closed safely even if two triodes are damaged and short-circuited at the same time, and the safety of a circuit is greatly improved.

The rated voltage of the power supply input is DC5V or DC 3V.

The outer casing of the thermocouple electromagnetic valve is connected with the outer casing of the stove, and because the outer casing of the stove of the special line can not be directly connected with the positive and negative of a power supply, an R21 resistor is specially added to a circuit for providing ignition high voltage, and the resistance value is between 1K and 5K.

Has the advantages that: the utility model discloses not only can realize in case take place in the cooking utensils burning that dry combustion method overtemperature or temperature control probe take place the short circuit and can reliably close pneumatic valve and report to the police, can detect whether open circuit faults such as disconnected desoldering of temperature control probe, damage in addition in every cooking utensils ignition use, then report to the police immediately if take place above-mentioned trouble, greatly improved the reliability and the security of preventing dry combustion method pulse ignition controller. The utility model discloses think about simple ingenious, the practicality is strong, can the wide application in prevent dry combustion method pulse ignition controller technical field.

The utility model provides an igniter with a temperature control probe of an anti-dry burning pulse igniter, aiming at the defects of the prior anti-dry burning pulse ignition controller, which is a gas cooker pulse igniter with the detection of the temperature control probe of the anti-dry burning pulse igniter and a control circuit of a thermocouple solenoid valve; the method and circuit for changing resistance value of detection test point by switching relay can use a group of voltage comparators to achieve detection of two completely different states on a temperature control probe, namely: the pulse ignition controller can not only detect the valve-closing alarm of the dry burning overtemperature when the stove is burnt, but also automatically detect whether the temperature control probe is broken, disconnected and welded, damaged and other open-circuit faults when the stove is ignited each time, and immediately alarm if the open-circuit faults such as broken, disconnected and welded, damaged and the like are found, so that a user is reminded that the dry burning prevention function of the furnace end is lost and the faults are timely eliminated, and the safety and the reliability of the stove are greatly improved.

Description of the drawings:

fig. 1 is a circuit flow diagram of the present invention.

Fig. 2 is a circuit diagram of the present invention.

The specific implementation mode is as follows:

the present invention will be further explained with reference to fig. 2.

When the stove switch pulse ignition controller A, B, C is switched on, three timing circuits are started simultaneously, wherein the A timing is set within 6-8 seconds, the rest B, C timing time is about a few seconds longer than A timing time, when A timing circuit is started, the first switch circuit Q16 is conducted, the high potential of the relay is used for controlling an ignition circuit through D6 and R23 on one path, Q13 is conducted through D7 and R20 on one path to enable the relay to be attracted, double contacts K1 and K2 of the relay are changed to the right, namely, the resistance value of the R2 dry burning point is cut off, the emitter of the Q1 is switched on, the Q1 is switched on the negative pole of the power supply, the connection between the Q3 and the output end of the comparator is cut off, when the temperature control probe is disconnected, is not welded, is damaged and the like, and is opened, the end potential of the positive terminal (resistance ∞) of the comparator IC1 is higher than the end potential of the negative terminal, the comparator IC1 immediately outputs high potential, so that the Q1 and the Q2 are conducted, and the Q5 is conducted through the D3 to electrify the buzzer to send out alarm sound. If the temperature control probe has no open circuit faults such as disconnection, welding failure, damage and the like, when the resistance value of the temperature control probe is far less than 4.7M, the negative end potential of the comparator is higher than the output low potential of the positive end IC1, the Q1 and the Q2 are cut off and are not conducted, and the buzzer does not give an alarm. At this time, although the comparator IC1 outputs a low potential, the Q3 is not conducted and will not alarm because the base of Q3 is open.

When the gas cooker is ignited, the circuit is provided with three paths (A, B, C) of timing circuits, the first switch circuit is conducted and connected in parallel to respectively conduct triodes Q6, Q7, Q8 and Q9 which are connected in series on a coil of a thermocouple electromagnetic valve, so that the thermocouple electromagnetic valve is electrified and attracted, an air valve is opened to enable the gas cooker to be ignited, and the gas cooker burns normally. After normal combustion, the external power supply of the thermocouple electromagnetic valve does not work (depending on the thermocouple current, which is an existing pneumatic rod meter), at the moment, the relay is reset at the left end, when the cooker is used during combustion, once the temperature control probe detects that the temperature of the bottom of the cooker is greater than a set value (during dry combustion), namely the resistance value of the temperature control probe is smaller than the sum of R1 and R2, the negative potential is immediately output by the IC1 at the minus end of the first comparator, the Q3 is immediately conducted, and the low potential is output by the IC2 to conduct the Q4 and conduct the Q10 and the Q12 through the C1 and the resistors R11 and D1 in one path; the other path of the current is used for conducting Q11 through a positive pulse signal which is formed by capacitors C2, D4, R17, R18, R19, Q14 and Q15 and is about 1 second, at the moment, because the direction of the current flowing through the electromagnetic valve is opposite to the direction of the current generated by the thermocouple and the current value of the current is far larger than the current generated by the thermocouple, the electromagnetic valve is pushed open and closed under the action of a spring, an air source is cut off, and simultaneously, after the Q3 is conducted, the high potential of the electromagnetic valve conducts the Q5 through D2 and R16 to enable the buzzer to be powered on to give out a buzzing alarm. When the resistance value of the temperature control probe is larger than the sum of R1 and R2 after the stove is flamed out, the comparator reversely rotates to output high potential, and the Q3 stops the buzzer, loses power and stops alarming. The product of the application is easy to manufacture, simple and reliable in structure and strong in practicability, and can be widely applied to the technical field of dry burning prevention pulse igniters.

Claims

1. An igniter provided with a dry-burning-resistant pulse igniter temperature control probe is characterized by comprising a relay, an ignition circuit, a dry-burning temperature control probe resistor, a thermocouple electromagnetic valve, a first comparator detection circuit, a second comparator detection circuit, a first switch circuit, a second switch circuit, a relay and a control circuit, wherein the direction of current flowing through the electromagnetic valve is opposite to the direction of current generated by the thermocouple, and the relay is a double-contact relay; the two input ends of a first comparator detection line are respectively connected with a dry-burning temperature control probe resistor and a comparison divider resistor, the input end of a second comparator detection line is respectively connected with the amplified output of the divider circuit and the first comparator, and the output end of the second comparator is connected with an amplifier and an amplifier output switching valve emitter amplifying circuit; the first switch circuit is connected with the ignition control ignition circuit and is connected in parallel to respectively conduct the triode circuits which are connected in series on the thermocouple electromagnetic valve coil; the double contacts of the relay are converted into a transient circuit, namely, a dry burning point resistor is disconnected, and after the transient state, an electric appliance is switched to change a circuit of a resistance value of a test point of a first comparator, and the circuit also comprises three paths of timing control electromagnetic valves for opening and closing the valves and an alarm circuit; when the stove is ignited, the relay circuit is switched on at the same time, the relay switches to change the resistance value circuit of the test point of the first comparator, and the comparator detection circuit simultaneously comprises three paths of timing control electromagnetic valves for opening and closing the valve and an alarm circuit;

the K1 transient state or the normal state of the double contacts of the relay are respectively disconnected or connected with the dry-burning temperature control probe and the Q1 emitter of the second switch circuit is connected or disconnected, so that the Q1 is connected with the negative electrode of the power supply or disconnected; the K2 of the double contacts of the relay simultaneously switches on or off the amplifying circuit Q3 of the second comparator; when the temperature control probe is broken and is off-welded, damaged and the like, the end potential of the first comparator IC1 is higher than the end potential of the first comparator IC1 immediately outputs high potential, so that the buzzer amplifier is conducted to be powered on.

2. The igniter provided with the temperature control probe of the dry-burning prevention pulse igniter as claimed in claim 1, wherein a thermocouple solenoid valve casing is connected with a cooker casing.

3. The igniter provided with the temperature control probe of the dry-burning prevention pulse igniter as claimed in claim 1, wherein a circuit is provided for high ignition voltage and is connected in series with a resistor R21, and the resistance of the resistor R21 is 1K-5K.

4. The igniter provided with the temperature control probe of the dry-fire prevention pulse igniter as claimed in claim 1, wherein the constant current source is used for a single-coil thermocouple solenoid valve or for a double-coil thermocouple solenoid valve.