Control system with slow-ignition self-absorption and holding double-coil electromagnetic valve

Abstract

The invention discloses a control system with a slow-ignition self-absorption and double-coil holding electromagnetic valve. The control system is used for controlling fuel gas to be output to a combustor to be ignited by soft fire and then to be combusted by big fire. In the starting process, the control system drives an ignition high-voltage spark circuit to ignite, the electromagnetic valve is driven to open small-flow gas to ignite small fire through initial ignition time and the self-absorption voltage loop according to set time and small voltage, and if no flame is detected within the initial ignition time, the control system is started to control the ignition high-voltage spark circuit to ignite. The valve opening force is increased by increasing the voltage through the one-time ignition time and the pressurization self-suction loop, so that the success rate of valve opening of the small-flow electromagnetic valve is increased, and frequent ignition failure, customer complaint of restarting and inconvenience of a user caused by external reasons are prevented. When the flame detection loop detects the flame ignited by the small fire during the period, the maximum gas can be opened to ignite the big fire, and the valve opening state is maintained by the small current, so that the power-saving effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to a control system with slow ignition self-suction and double-coil solenoid valve for outputting gas to a burner in stages, igniting with small flow first, and then burning with large flow; the present application aims to increase the success rate of small flow valve opening by increasing voltage, to avoid the probability of ignition failure. BACKGROUND

[0002] The present inventor has improved the burner solenoid valve, mainly using slow opening to control the gas to output with small flow for ignition and then burn with large flow to avoid large fire explosion. The related patent is granted and announced as CN223524570U Slow-opening Solenoid Valve for Burner.

[0003] In addition to being able to relieve the static pressure of the gas applied to the main valve plug, the small valve group in the above-mentioned CN223524570U Slow-opening Solenoid Valve for Burner can effectively help the electromagnetic coil start and maintain the opening of the second-stage main valve group with smaller power, achieving the purpose of power saving.

[0004] After the actual implementation of the above-mentioned patent technology, the expected effect can indeed be achieved. Based on the concept of making the product more perfect, the present inventor has continued to research and found that if the slow-opening solenoid valve fails to open the small valve at the initial stage, it will cause the user to repeatedly wait for no hot water supply and need to close the hot water faucet again. Although the probability of small valve opening failure is very low, it is still necessary to prevent it. SUMMARY

[0005] The main purpose of the present application is to provide a control system with slow ignition self-suction and double-coil solenoid valve. After starting the ignition high-voltage spark circuit for ignition, a set time and a smaller voltage are used to drive the small-flow electromagnetic valve to open the small-flow gas for ignition. If the ignition is successful, the maximum rated voltage is used to open the maximum-flow electromagnetic valve. If no flame is detected, the opening force of the small-flow electromagnetic valve is increased by increasing the voltage, to increase the success rate of small-flow electromagnetic valve opening.

[0006] To achieve the above-mentioned purpose, the present application provides a control system with slow ignition self-suction and double-coil solenoid valve. The double-coil solenoid valve includes a small-flow electromagnetic valve and a maximum-flow electromagnetic valve with different opening degrees, so that external gas can be supplied to a burner through the small-flow electromagnetic valve to ignite a small fire, and then through the maximum-flow electromagnetic valve to ignite a large fire.

[0007] The control system comprises at least one set of ignition high-voltage spark circuit, one flame detection circuit for detecting the ignition state of the burner, one initial ignition time and self-suction voltage circuit, one secondary ignition time and self-suction circuit, one maximum solenoid self-suction voltage circuit, one holding voltage and small current circuit, and one safety ignition time circuit.

[0008] When the ignition high-voltage spark circuit of the control system ignites, the initial ignition time and self-suction voltage circuit drives the small-flow solenoid valve to open to ignite small fire with a set time and a relatively small voltage.

[0009] When the secondary ignition time and self-suction circuit increases the driving force of the small-flow solenoid valve to open within a set time with an increased voltage when the set time of the initial ignition time and self-suction voltage circuit is exceeded and the flame detection circuit does not detect the ignition of the burner, small fire is ignited.

[0010] When the flame detection circuit detects the ignition of the burner, the maximum solenoid self-suction voltage circuit provides maximum voltage to open the maximum-flow solenoid valve to ignite large fire, and the holding voltage and small current circuit maintains the low current open valve state.

[0011] When the maximum solenoid self-suction voltage circuit provides maximum voltage to open the maximum-flow solenoid valve when the time of the secondary ignition time and self-suction circuit opening the small-flow solenoid valve is exceeded and the flame detection circuit does not detect the ignition of the burner, and

[0012] When the maximum-flow solenoid valve is in an open state and the flame detection circuit does not detect the ignition of the burner, the safety ignition time circuit closes all circuits of the control system.

[0013] When the initial ignition time and self-suction voltage circuit and the secondary ignition time and self-suction circuit each include a delay time, the flame detection circuit detects the ignition of small fire, and the delay time delays the opening of the maximum-flow solenoid valve to prevent the superposition of the ignition sound of small fire and large fire, thereby preventing the generation of a larger explosion sound volume.

[0014] When the secondary ignition time and self-suction circuit increases the voltage, the method includes but is not limited to linearly increasing the voltage or increasing the voltage in steps.

[0015] The double-coil electromagnetic valve comprises a strong suction electromagnetic coil, a holding coil arranged outside the strong suction electromagnetic coil, a fixed core arranged inside the strong suction electromagnetic coil, a movable core capable of being displaced in two stages by magnetic suction of the fixed core, and a valve seat for fixation; the strong suction electromagnetic coil and the fixed core are arranged above the valve seat, and the small-flow electromagnetic valve and the maximum-flow electromagnetic valve are arranged respectively at the bottom of the movable core below the valve seat.

[0016] The maximum-flow electromagnetic valve comprises a main valve plug elastically closing a gas passage hole at the bottom of the main valve plug, and a small valve hole arranged on the main valve plug and communicating with the gas passage hole.

[0017] The small-flow electromagnetic valve comprises a pressing part arranged at the bottom of the movable core and synchronously displaced, and the pressing part is capable of elastically closing the small valve hole with small displacement.

[0018] When the ignition high-voltage spark circuit of the control system is ignited, the initial ignition time and the self-suction voltage circuit drive the movable core and the pressing part to be displaced upward to open the small valve hole by the strong suction electromagnetic coil with a set time and a small voltage.

[0019] The secondary ignition time and the self-suction circuit increase the magnetic suction force of the strong suction electromagnetic coil in a set time with an increased voltage, so as to increase the force for driving the movable core and the pressing part to be displaced upward to open the small valve hole in a set time.

[0020] When the flame detection circuit detects that the burner is burning, the strong suction electromagnetic coil is provided with a maximum voltage by the maximum-flow electromagnetic valve self-suction voltage circuit, so that the movable core drives the main valve plug of the maximum-flow electromagnetic valve to be displaced upward to open the gas passage hole, and then the holding coil is provided with a small current by the holding voltage small current circuit to keep the open valve state of the maximum-flow electromagnetic valve.

[0021] In the implementation, the pressing part is a soft buckle of elastic material arranged at the bottom of the movable core, so that the pressing part can elastically press and close the small valve hole with small displacement, and prevent the pressing part and the small valve hole from being incompletely closed due to machining error.

[0022] Compared with the prior art, the present application can drive the small flow electromagnetic valve to open by using the initial ignition time and the self-suction voltage circuit with a set time and voltage, and can provide the maximum voltage to the maximum flow electromagnetic valve through the maximum electromagnetic valve self-suction voltage circuit to open the maximum flow electromagnetic valve at the maximum flow when the flame detection circuit detects the burner combustion. If the flame detection circuit does not detect the burner combustion, the opening degree of the small flow electromagnetic valve is increased by using the subsequent ignition time and the pressure-increasing self-suction circuit to increase the driving voltage, thereby improving the success rate of small flow ignition and preventing the user from being inconvenient due to repeated ignition failure caused by external reasons.

[0023] The following embodiments suitable for the present application are listed according to the technical means of the present application, and are described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The system schematic diagram of the present application.

[0025] Figure 2 The structure schematic diagram of the double-coil electromagnetic valve in the present application.

[0026] Figure 3 The schematic diagram of the initial opening of the small flow electromagnetic valve in the present application.

[0027] Figure 4 The schematic diagram of the opening of the maximum flow electromagnetic valve in the present application.

[0028] Figure 5 The system schematic diagram of the present application.

[0029] Figure 6 The timing diagram of opening the valve by integrating all circuits in the present application.

[0030] Figure 7 The action timing diagram of the initial ignition time and the self-suction voltage circuit in the present application.

[0031] Figure 8 The action timing diagram of the subsequent ignition time and the pressure-increasing self-suction circuit in the present application.

[0032] Figure 9 The action timing diagram of the maximum electromagnetic valve self-suction voltage circuit in the present application.

[0033] Figure 10 The action timing diagram of the safe ignition time circuit in the present application.

[0034] Figure 11 The flow block diagram of the present application.

[0035] Explanation of reference numerals in the attached diagram: 100-Burner; 101-Ignition electrode; 102-Gas passage; 103-Water tray; 104-Water tap; 200-Control system; 300-Dual coil solenoid valve; 301a-Forced suction solenoid coil; 301b-Holding coil; 302-Fixed iron core; 303-Moving iron core; 304-Valve seat; 400-Small flow solenoid valve; 401-Pressure part; 500-Maximum flow solenoid valve; 501-Main valve plug; 502-Gas through hole; 503-Movement space; 504-Small valve orifice ; 10 - Ignition high-voltage spark circuit; 20 - Flame detection circuit; 30 - Initial ignition time and self-priming voltage circuit; 40 - Secondary ignition time and boost self-priming circuit; 50 - Maximum solenoid valve self-priming voltage circuit; 60 - Holding voltage and micro-current circuit; 70 - Safe ignition time circuit; T1, T2, TS - Set time; Td - Delay time; V1, V2 - Voltage; Vmax - Maximum voltage; V2a - Linearly increasing voltage; V2b - Stepped boost; Vk - Holding voltage and micro-current; FR - Flame signal. Detailed Implementation

[0036] This invention provides a control system with a slow-ignition self-priming and holding dual-coil solenoid valve. The system is used to control the phased output of gas to a burner, so that the gas is first ignited with a small flow rate and then burned with a large flow rate.

[0037] like Figure 1 In the embodiment shown, the burner 100 is a burner of a water heater, with at least one ignition electrode 101 at the top and a gas passage 102 connected to the bottom. The gas passage 102 is controlled to open or close by a water pan 103, a control system 200, and a dual-coil solenoid valve 300 to allow gas to flow.

[0038] When the tap 104 is turned on and the water pan 103 is activated, the control system 200 can drive the ignition electrode 101 to generate a spark, and at the same time control the dual coil solenoid valve 300 to open, so that the gas is released from the gas passage 102 to the burner 100, so that the burner 100 can obtain the gas supply and burn.

[0039] like Figures 1 to 4 As shown, the dual-coil solenoid valve 300 in this embodiment is provided with a small-flow solenoid valve 400 and a maximum-flow solenoid valve 500 that open in stages. The dual-coil solenoid valve 300 includes a strong-attraction solenoid coil 301a, a holding coil 301b disposed around the strong-attraction solenoid coil 301a, a fixed iron core 302 disposed inside the strong-attraction solenoid coil 301a, a movable iron core 303 that can be magnetically attracted by the fixed iron core 302 and displaced in two stages, and a valve seat 304 for fixing.

[0040] The strong suction electromagnetic coil 301a and the fixed core 302 are arranged above the valve seat 304, the movable core 303 is arranged below the fixed core 302, the small flow electromagnetic valve 400 and the maximum flow electromagnetic valve 500 are arranged at the bottom of the movable core 303 below the valve seat 304.

[0041] The maximum flow electromagnetic valve 500 comprises a main valve plug 501, the bottom of the main valve plug 501 elastically seals a gas through hole 502, the top of the main valve plug 501 is provided with a concave movable space 503, the bottom of the movable space 503 is provided with a small valve hole 504 communicating with the gas through hole 502.

[0042] The small flow electromagnetic valve 400 comprises a pressing part 401 synchronously displaced at the bottom of the movable core 303, the movable core 303 extends downward through the movable space 503, so that the pressing part 401 is pressed against the small valve hole 504. In the figure, the pressing part 401 is a soft buckle of elastic material at the bottom of the movable core 303, so that the pressing part 401 can elastically press and seal the small valve hole 504 with small swing, and the function of the pressing part 401 to seal the small valve hole 504 with small swing can avoid incomplete sealing between the pressing part 401 and the small valve hole 504 due to assembly or machining tolerance.

[0043] The basic action of the stage opening of the double-coil electromagnetic valve 300 in the embodiment is that, in addition to providing high-voltage ignition for the ignition electrode 101, the control system 200 provides a working voltage of 0.8V to 1.0V to the strong suction electromagnetic coil 301a, at this time the strong suction electromagnetic coil 301a generates a magnetic attraction force on the movable core 303 through the fixed core 302 to displace the movable core 303, so that the pressing part 401 of the small flow electromagnetic valve 400 at the bottom of the movable core 303 is away from the small valve hole 504, the small valve hole 504 is opened to make the small flow of gas pass through the gas passage 102 to the burner 100 to burn with small fire, and the first stage ignition is completed.

[0044] After the small flow electromagnetic valve 400 is opened, the control system 200 provides a rated maximum voltage of 3V to the strong suction electromagnetic coil 301a, and then the movable core 303 increases the displacement distance to drive the main valve plug 501 of the maximum flow electromagnetic valve 500 to be away from the gas through hole 502, so that the gas is opened with maximum flow, and the second stage opening is completed, and when the maximum flow electromagnetic valve 500 is opened, the holding coil 301b can maintain the maximum flow electromagnetic valve 500 in the opened state with a small current.

[0045] For example, the current of the strong suction electromagnetic coil 301a is about 500mA-600mA, and after the opening of the maximum flow electromagnetic valve 500 is completed, the holding coil 301b maintains the opened state with a small current of 5mA, so as to achieve the purpose of saving electricity.

[0046] AsFigure 1 and Figure 5 As shown, in conjunction with the above-mentioned ignition and phased gas supply, and to prevent the failure of the aforementioned small-flow solenoid valve 400 to open and ignite the small flame, the control system 200 of the present invention includes: at least one set of ignition high-voltage spark circuit 10, a flame detection circuit 20 for detecting the combustion state of the burner 100, an initial ignition time and self-priming voltage circuit 30, a primary ignition time and boosting self-priming circuit 40, a maximum solenoid valve self-priming voltage circuit 50, a holding voltage micro-current circuit 60, and a safe ignition time circuit 70.

[0047] When the ignition high-voltage spark circuit 10 of the control system 200 supplies ignition electrode 101 for ignition, the initial ignition time and self-priming voltage circuit 30 drives the small flow solenoid valve 400 to open with a set time and voltage. Within the set time, the flame detection circuit 20 can provide the maximum voltage through the maximum solenoid valve self-priming voltage circuit 50, so that the maximum flow solenoid valve 500 opens with the maximum flow, completing the aforementioned two-stage gas opening. Then, the holding voltage micro-current circuit 60 supplies a small current of about 5mA to the holding coil 301b, so that the maximum flow solenoid valve 500 can maintain the open state with very low power consumption.

[0048] When the flame detection circuit 20 fails to detect combustion of the burner 100 within the time set by the initial ignition time and the self-priming voltage circuit 30, the secondary ignition time and the boosted self-priming circuit 40 can increase the opening force of the small flow solenoid valve 400 by increasing the voltage within the set time, so that the small flow solenoid valve 400 can be opened smoothly to supply a small flow of gas for small flame combustion. Then, the maximum voltage is provided through the maximum solenoid valve self-priming voltage circuit 50, so that the maximum flow solenoid valve 500 opens and burns at the maximum flow.

[0049] The above process is based on Figures 6 to 11 For example, please refer to the following: Figures 1 to 5 When the ignition high-voltage spark circuit 10 of the aforementioned control system 200 causes the ignition electrode 101 to generate a spark, the initial ignition time and self-priming voltage circuit 30 first drives the movable iron core 303 and the pressing part 401 to move upward and open the small valve hole 504 through the strong suction electromagnetic coil 301a with a set time T1 and voltage V1 (e.g., 0.8-1.0V).

[0050] At this time, as Figure 1 , Figure 4 , Figure 5 , Figure 7 , Figure 11As shown, if the pressure part 401 successfully opens the small valve hole 504, the small flow gas will be ignited, at this time the flame signal FR of the flame detection circuit 20 detects that the burner 100 has successfully burned at any time point within the set time 0~T1, indicating that the small flow electromagnetic valve 400 is successfully opened, then the control system 200 can provide the maximum voltage Vmax (for example, 3.0V) of the maximum electromagnetic valve self-suction voltage circuit 50 to the strong suction electromagnetic coil 301a to drive the moving iron core 303 and the main valve plug 501 away from the gas through hole 502, so that the maximum flow electromagnetic valve 500 is opened with the maximum flow to burn the large fire, and then the holding voltage and small current Vk can be maintained by the holding voltage and small current circuit 60 and the holding coil 301b. During this process, since the burner 100 has been burned with small flow first, when the large flow is opened to burn the large fire, there will be no explosion.

[0051] In implementation, the initial ignition time self-suction voltage circuit 30 includes a delay time Td, when the flame detection circuit 20 detects that the burner 100 is burning within the set time 0~T1, the delay time Td can be used to delay the maximum voltage Vmax provided by the maximum electromagnetic valve self-suction voltage circuit 50 to drive the maximum flow electromagnetic valve 500 to open, avoid misoperation, and prevent the small flow burner from igniting small fire and the large flow gas from igniting large fire, so that the sound of the two is superimposed to produce a larger explosion volume.

[0052] As shown in Figure 1 , Figure 4 , Figure 5 , Figure 8 , Figure 11 When the flame signal FR of the flame detection circuit 20 does not detect the signal that the burner 100 has successfully burned within the set time T1, it represents that the initial ignition time and the self-suction voltage circuit 30 fail to ignite the small flow gas, at this time the secondary ignition time and the pressure boosting self-suction circuit 40 can increase the magnetic suction force of the strong suction electromagnetic coil 301a in the form of increasing voltage V1~V2 within the set time T1~T2, so as to gradually increase the force of driving the moving iron core 303 and the pressure part 401 to displace upward and open the small valve hole 504 within the set time T1~T2.

[0053] In implementation, the form of increasing voltage of the secondary ignition time and the pressure boosting self-suction circuit 40 includes but is not limited to linearly increasing voltage V2a or stepwise increasing voltage V2b. For example, the linearly increasing voltage V2a is a rising power line, which gradually increases from 1.0V to 1.9V; the stepwise increasing voltage V2b is a step line, which increases from 1.0V to 1.9V at one time, or increases from 1.0V, 1.5V to 1.9V.

[0054] Likewise, if the flame detection circuit 20 detects a flame signal FR from the burner 100 at any time within the set time T1~T2, indicating that the small flow electromagnetic valve 400 has successfully opened and is burning at a small flame, the control system 200 can provide the maximum voltage Vmax to the maximum electromagnetic valve self-suction voltage circuit 50 to drive the movable iron core 303 and the main valve plug 501 away from the gas passage hole 502, so that the main valve plug 501 of the maximum flow electromagnetic valve 500 is away from the gas passage hole 502, and the gas is opened at a maximum flow. After that, the holding voltage and small current circuit 60 and the holding coil 301b are used to maintain the opening state with a holding voltage and a small current Vk.

[0055] In addition, the next ignition time and pressure self-suction circuit 40 can also include a delay time Td. When the flame detection circuit 20 detects that the burner 100 is burning within the set time T1~T2, the delay time Td can be used to delay the maximum voltage Vmax provided by the maximum electromagnetic valve self-suction voltage circuit 50 to drive the maximum flow electromagnetic valve 500 to open, so as to avoid the explosion volume.

[0056] As shown in Figure 1 , Figure 4 , Figure 5 , Figure 9 , Figure 11 In order to avoid the inconvenience caused by the failure to ignite the flame, the maximum electromagnetic valve self-suction voltage circuit 50 can still provide the maximum voltage Vmax to make the main valve plug 501 of the maximum flow electromagnetic valve 500 away from the gas passage hole 502 to allow the gas to flow, so as to avoid the situation of failure to ignite the flame as much as possible.

[0057] As shown in Figure 1 , Figure 5 , Figure 10 , Figure 11 In order to improve safety, the control system 200 further includes a safety ignition time circuit 70. When the maximum electromagnetic valve self-suction voltage circuit 50 drives the maximum flow electromagnetic valve 500 to open, and the flame detection circuit 20 still does not detect the ignition and burning signal FR within the set time TS, the safety ignition time circuit 70 can interrupt the power of the entire system, so that all circuits in the system are closed, until the user closes the faucet 104 and reopens to restart.

[0058] It is worth mentioning that Figure 1 and Figures 5 to 11In the system diagram, the timing diagram and the flow chart shown, when the maximum flow electromagnetic valve 500 is opened to make the gas flow at the maximum flow, and the ignition high-voltage spark circuit 10 and the maximum electromagnetic valve self-suction voltage loop 50 are terminated, the holding voltage micro-current loop 60 is used to supply the holding voltage and the micro-current Vk to the holding coil 301b, so that the valve can be maintained in the open state with very little power consumption, achieving the purpose of saving electricity.

[0059] The above examples and drawings are only used to illustrate the preferred embodiments of the present application, and are not intended to limit the scope of the present application; for example, any similar or identical purpose, structure, device, feature, etc. should belong to the protection scope of the present application.

Claims

1. A control system for a slow ignition self-suction and holding dual-coil solenoid valve, the dual-coil solenoid valve comprising a small flow solenoid valve and a maximum flow solenoid valve with different opening degrees, so that external gas can be supplied to a burner through the small flow solenoid valve to ignite a small fire, and then through the maximum flow solenoid valve to ignite a large fire; the control system comprising at least one set of ignition high-voltage spark circuit, a flame detection circuit for detecting the ignition state of the burner, a primary ignition time and self-suction voltage circuit, a secondary ignition time and pressure self-suction circuit, a maximum solenoid self-suction voltage circuit, a holding voltage and small current circuit, and a safety ignition time circuit; characterized in that: when the ignition high-voltage spark circuit of the control system ignites, the primary ignition time and self-suction voltage circuit drives the small flow solenoid valve to open with a set time and a relatively small voltage to ignite a small fire; when the set time of the primary ignition time and self-suction voltage circuit is exceeded and the flame detection circuit does not detect the ignition of the burner, the secondary ignition time and pressure self-suction circuit can increase the opening degree of the small flow solenoid valve with a set time and an increased voltage to ignite a small fire; and when the flame detection circuit detects the ignition of the burner, the maximum solenoid self-suction voltage circuit can provide a maximum voltage to open the maximum flow solenoid valve at a maximum flow to ignite a large fire, and the holding voltage and small current circuit can maintain a low current open valve state.

2. The control system for a slow ignition self-suction and holding dual-coil solenoid valve according to claim 1, characterized in that: when the set time of the secondary ignition time and pressure self-suction circuit for opening the small flow solenoid valve is exceeded and the flame detection circuit does not detect the ignition of the burner, the maximum solenoid self-suction voltage circuit can provide a maximum voltage to open the maximum flow solenoid valve at a maximum flow; and when the maximum flow solenoid valve is in an open state and the flame detection circuit does not detect the ignition of the burner, the safety ignition time circuit can close all circuits of the control system. The primary ignition time and self-suction voltage circuit and the secondary ignition time and pressure self-suction circuit each include a delay time, which can delay the opening of the maximum flow solenoid valve when the flame detection circuit detects the ignition of the small fire, preventing the superposition of the ignition sound of the small fire and the large fire to produce a larger explosion sound volume. The secondary ignition time and pressure self-suction circuit includes linearly increasing voltage or stepwise increasing voltage.

5. The control system for a slow ignition self-suction and holding dual-coil solenoid valve according to claim 4, wherein the dual-coil solenoid valve comprises a strong suction electromagnetic coil, a holding coil arranged around the strong suction electromagnetic coil, a fixed iron core arranged inside the strong suction electromagnetic coil, a movable iron core capable of being attracted by the fixed iron core to move in two stages, and a valve seat for fixation; the strong suction electromagnetic coil and the fixed iron core are arranged above the valve seat, and the small flow solenoid valve and the maximum flow solenoid valve are arranged at the bottom of the movable iron core below the valve seat. ​ ​ ​ 3. The control system having a slow ignition self-priming and maintaining double-coil solenoid valve according to claim 2, characterized by: ​ 4. The control system having a slow ignition self-suction and maintaining double-coil solenoid valve according to any one of claims 1-3, characterized in that: ​ ​ The maximum flow electromagnetic valve comprises a main valve plug, which elastically closes a gas passage hole at the bottom and is provided with a small valve hole communicating with the gas passage hole; characterized in that: The small flow electromagnetic valve comprises a pressing part at the bottom of the movable core and synchronously displaced, which can elastically close the small valve hole with small swing; When the control system ignites the high-voltage spark line, the initial ignition time and the self-induced voltage circuit drive the movable core and the pressing part to displace upward to open the small valve hole with a set time and voltage through the strong suction electromagnetic coil; The secondary ignition time and the pressure-increasing self-induced circuit increase the magnetic suction force of the strong suction electromagnetic coil in a set time with increased voltage, thereby slowly increasing the force for driving the movable core and the pressing part to displace upward to open the small valve hole in a set time; When the flame detection circuit detects the combustion of the burner, the strong suction electromagnetic coil is provided with the maximum voltage through the maximum electromagnetic valve self-induced voltage circuit after the movable core drives the main valve plug of the maximum flow electromagnetic valve to displace upward to open the gas passage hole, and the holding coil is provided with a low current to keep the open valve state of the maximum flow electromagnetic valve through the holding voltage small current circuit.

6. The control system having a slow ignition self-priming and maintaining double coil solenoid valve according to claim 5, characterized by: The pressing part is a soft buckling of elastic material at the bottom of the movable core, so that the pressing part can elastically press and close the small valve hole with small swing, preventing the pressing part and the small valve hole from being incompletely closed due to machining errors.

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