CN210801287U

CN210801287U - Gas valve switch device of integrated stove

Info

Publication number: CN210801287U
Application number: CN201921474243.3U
Authority: CN
Inventors: 范德忠; 吕嵊锋
Original assignee: Zhejiang Seng Electrical Co ltd
Current assignee: Zhejiang Senge intelligent Kitchen Appliance Co.,Ltd.
Priority date: 2019-09-05
Filing date: 2019-09-05
Publication date: 2020-06-19
Anticipated expiration: 2029-09-05

Abstract

The utility model discloses a gas valve switching device of integrated kitchen, including the solenoid valve that is used for controlling the gas supply, the solenoid valve includes start coil and maintenance coil, gas valve switching device still includes: a start-up circuit, a thermocouple, and a shut-down circuit. The utility model discloses gas valve switching device provides pulse current to the start coil of solenoid valve through starting circuit and makes the solenoid valve open, then the thermocouple is heated and forms the electromotive force after integrated kitchen ignition burning, provides the holding current to the holding coil, forms the holding magnetic field, and starting circuit can be in need not to continue to provide the electric current after the start; when the electromagnetic valve needs to be closed, a closing circuit supplies closing current for closing to the starting coil to form a closing magnetic field, the closing magnetic field is opposite to the maintaining magnetic field, and the magnetic field is offset, so that the electromagnetic valve is cut off.

Description

Gas valve switch device of integrated stove

Technical Field

The utility model relates to a gas-cooker technical field especially relates to the gas valve switching device of integrated kitchen.

Background

In the prior art, when a gas valve (electromagnetic valve) of a general control integrated stove is opened or closed, a main control board outputs a large current which is directly transmitted to a coil of the gas valve, so that the coil generates a magnetic field, and the gas valve is opened to keep the integrated stove in a combustion state. However, due to the design, the gas valve cannot be closed effectively sometimes due to the influence of factors such as the power of the main control board and the like, and in addition, the EMC of the electric board is greatly influenced.

For example, the utility model with the license number of CN201225681 discloses a fuel control and automatic ignition system for a cooking stove, which comprises a 220 v ac power supply, an ignition coil connected with two ignition needles, and an automatic ignition device arranged between the ac power supply and the ignition coil; the automatic ignition device is formed by connecting an alternating current power supply, a pot position switch, a main relay, a time relay, a transformer, a rectifier, a direct current igniter and an ignition coil in sequence, wherein the alternating current power supply is connected with the time relay, and the ignition coil is connected with the direct current igniter; the 220V alternating current power supply is also connected with a solenoid valve switch.

The utility model with the authorized bulletin number of CN202733942U discloses an ignition device of an integrated cooker, which comprises a direct current power supply, an electronic igniter, a relay and a power supply module externally connected with an alternating current power supply, wherein a control coil of the relay is connected with the output end of the power supply module; the output end of the power supply module is connected with the electronic igniter through a normally open contact of the relay; and the direct current power supply is connected with the electronic igniter through the normally closed contact of the relay.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the not enough of existence among the prior art, provide the gas valve switching device of integrated kitchen.

Gas valve switching device of an integrated cooker, including a solenoid valve for controlling supply of gas, the solenoid valve including a start coil and a maintenance coil, the gas valve switching device further including:

the starting circuit is used for providing pulse current for starting to the starting coil to form a starting magnetic field for opening the electromagnetic valve;

the thermocouple and the maintaining coil form a loop, when the integrated cooker burns, the thermocouple is heated to generate electromotive force, and provides maintaining current for the maintaining coil to form a maintaining magnetic field for maintaining the electromagnetic valve in an open state;

and a closing circuit for supplying a closing current for closing to the starting coil to form a closing magnetic field for closing the solenoid valve by canceling the maintaining magnetic field.

The starting circuit provides pulse current for starting, the electromagnetic valve is opened, fuel gas is sprayed out, after the integrated stove starts to burn, the thermocouple is heated to generate electromotive force and flows through the maintaining coil, the maintaining coil can provide a magnetic field required by keeping the electromagnetic valve open, the starting coil does not need to provide the magnetic field, and the starting circuit does not need to provide current for the starting coil. Preferably, the pulse current provided by the starting circuit is maintained for 7 s.

The direction of the pulse current provided by the starting circuit to the starting coil is opposite to the direction of the closing current provided by the closing circuit to the starting coil.

One end of the starting coil is connected with the starting circuit and the closing circuit, and the other end of the starting coil is grounded.

The starting circuit comprises a plurality of triodes for amplifying current, wherein the collector electrode of the triode close to the starting coil is connected with the starting coil, and the emitter electrode of the triode is connected with a-3V power supply.

The shutdown circuit comprises a plurality of triodes for amplifying current, wherein a collector electrode of the triode close to the starting coil is connected with the starting coil, and an emitter electrode of the triode is connected with a +3V power supply.

One end of the maintaining coil is connected with the thermocouple, and the other end of the maintaining coil is grounded.

The utility model discloses the gas valve switching device of integrated kitchen provides pulse current to the start-up coil of solenoid valve through starting circuit and makes the solenoid valve open, then the electric heat couple is heated and is formed the electromotive force after integrated kitchen ignition burning, provide holding current to holding coil, form and maintain the magnetic field, as long as integrated kitchen keeps burning, can make holding coil have the electric current to pass through always and control the solenoid valve and keep the open mode, starting circuit only provides a very short time pulse current when starting the ignition and is used for starting can, starting circuit can be without continuing to provide the electric current after starting; when the electromagnetic valve needs to be closed, a closing circuit supplies closing current for closing to the starting coil to form a closing magnetic field, the closing magnetic field is opposite to the maintaining magnetic field, and the magnetic field is offset, so that the electromagnetic valve is cut off.

Drawings

Fig. 1 is a schematic diagram of the circuit structure of the gas valve switching device of the present invention.

Detailed Description

As shown in fig. 1, the gas valve switching device of the integrated cooker includes a solenoid valve for controlling the supply of gas, the solenoid valve including a start coil and a sustain coil, i.e., the solenoid valve is a kind of double coil solenoid valve, the solenoid valve provides gas required for combustion of the integrated cooker when opened, and the integrated cooker is closed when closed. The present application is not directed to improvements in electronic igniters used for ignition, and therefore electronic igniters have not been shown.

This application gas valve switching device still includes: a start-up circuit, a thermocouple, and a shut-down circuit.

Wherein, one end of the starting coil is connected with the starting circuit and the closing circuit, and the other end is grounded. The starting circuit is used for providing pulse current for starting to the starting coil and forming a starting magnetic field for opening the electromagnetic valve. As shown in fig. 1, the start-up circuit includes three transistors, Q9, Q10 and Q11, wherein the collector of Q9 is connected to the base of Q10 and the emitter of Q9 is grounded. The collector of Q10 is connected with the base of Q11, and the emitter of Q10 is connected with a +3V power supply; the collector of the transistor Q11 adjacent to the start coil is connected with the start coil, and the emitter is connected with a-3V power supply. The Q9 and Q11 may use a triode model SS8050, and the Q10 may use a triode model SS 8550. R25-R30 are resistors, and the size of the resistor is selected according to actual needs.

The thermocouple and the maintaining coil form a loop, one end of the maintaining coil is connected with the thermocouple, and the other end of the maintaining coil is grounded. When the integrated cooker is burnt, the thermocouple is heated to generate electromotive force, and a maintaining current is provided for the maintaining coil to form a maintaining magnetic field for maintaining the electromagnetic valve in an open state.

The closing circuit supplies a closing current for closing to the starting coil, and forms a closing magnetic field for closing the solenoid valve by canceling the holding magnetic field. As shown in fig. 1, the shutdown circuit includes 2 transistors Q3 and Q4 for amplifying current, a collector of the transistor Q3 is connected to a base of the transistor Q4, and an emitter of the transistor Q3 is grounded. The collector of Q4 is connected to the start coil and the emitter is connected to the +3V supply. Transistor Q3 may be a transistor model SS8050, and transistor Q4 may be a transistor model SS 8550. R9-R12 are resistors, and the size of the resistor is selected according to actual needs.

When the integrated cooker is ignited, one end of ON-L of the starting circuit receives a small current sent by a control chip of the integrated cooker, after the current amplification effect of three triodes Q9, Q10 and Q11 is achieved, Q11 is conducted, then a sufficient current is provided for the starting coil to flow through the starting coil, the current flows through the starting coil from the ground to the direction of minus 3V, the electromagnetic valve obtains a starting magnetic field to be opened, gas is sprayed out, after the integrated cooker starts to burn, the thermocouple is heated to generate electromotive force and flows through the maintaining coil, the maintaining coil can provide a magnetic field required for keeping the electromagnetic valve open, the starting coil does not need to provide the magnetic field, and the starting circuit does not need to provide the current for the starting coil. Preferably, the pulse current provided by the starting circuit is maintained for 7 s.

As long as the integrated cooker keeps burning, the maintaining coil can always have current passing and the control solenoid valve keeps an open state, the starting circuit only provides a pulse current for a short time for starting when starting ignition, and the starting circuit can not continuously provide current after starting; when the integrated cooker needs to be closed, one end of an OFF-L of the closing circuit receives a small current sent by the integrated cooker control chip, after the current amplification effect of the triodes Q3 and Q4 is achieved, the Q4 is conducted, then a sufficient current is provided for the starting coil to flow through the starting coil, the current flows through the starting coil from +3V, the current direction of the starting coil is opposite to that of the maintaining coil, namely the closing magnetic field formed by the starting coil is opposite to the maintaining magnetic field formed by the maintaining coil, the magnetic fields are offset, the electromagnetic valve is cut OFF, and the integrated cooker is closed.

This application comes control start coil through the input undercurrent, and only need to input the electric current of short time respectively when igniteing and closing, and the undercurrent is through control start coil after enlargeing, and the reliability improves greatly, and it is many to reduce main control panel design requirement, especially power and EMC requirement.

Compared with the prior art that when the furnace fire is closed, the main board is required to output a 12V voltage, approximately 2A current is applied to the maintaining coil, so that the maintaining coil is de-energized, but because the output power of the switching power supply is limited, the aim of outputting large current is fulfilled by utilizing large-capacitor discharge, and the charging time is generally required to be more than 5 seconds. In the application, only one reverse current needs to be input into the starting coil, and the current value only needs to be a few tenths of amperes, so that the discharge of a large capacitor does not need to be recycled, and the time for closing the furnace fire is greatly shortened.

Claims

1. Gas valve switching device of an integrated cooker, comprising an electromagnetic valve for controlling the supply of gas, characterized in that said electromagnetic valve comprises a start coil and a maintenance coil, said gas valve switching device further comprising:

2. A gas valve switching device as claimed in claim 1, wherein the pulse current supplied from the starting circuit is maintained for a period of 7 s.

3. A gas valve switching device as in claim 1, wherein the direction of the pulse current supplied to the activation coil by the activation circuit is opposite to the direction of the closing current supplied to the activation coil by the closing circuit.

4. A gas valve switching device according to claim 3, wherein said start coil has one end connected to said start circuit and said shut-off circuit and the other end grounded.

5. A gas valve switching device according to claim 4, wherein said start circuit comprises a plurality of transistors for amplifying current, wherein a collector of the transistor adjacent to the start coil is connected to said start coil and an emitter thereof is connected to a-3V power supply.

6. A gas valve switching device according to claim 4, wherein the shutdown circuit comprises a plurality of transistors for amplifying the current, wherein the collector of the transistor adjacent the start coil is connected to the start coil and the emitter is connected to a +3V power supply.

7. A gas valve switching device as defined in claim 1, wherein said holding coil is connected at one end to said thermocouple and at the other end to ground.