WO1998033019A1

WO1998033019A1 - Fabricating method of flame sensing device and safety apparatus of gas stove using the same

Info

Publication number: WO1998033019A1
Application number: PCT/CN1998/000013
Authority: WO
Inventors: Fan Zhang
Original assignee: Fan Zhang
Priority date: 1997-01-24
Filing date: 1998-01-22
Publication date: 1998-07-30
Also published as: AU5746798A

Abstract

Fabricating method of four flame sensing devices and safety apparatus of gas stove using the same are provided by the invention. The apparatus comprises a flame probe, a self-excited multivibrator without transformer, at least one flame sensing circuit for receiving continuous vibratory signal from the multivibrator, a amplitude discriminator, electronic switch (or comparer), a control unit and accident preventing circuit; whereby obtaining normal burning signal, accident flameout signal probe 'contact' logic signal. The apparatus is a safety device for gas stove having high reliability and speed switching.

Description

Method for preparing flame sensor and safety protection device for burning appliance

~ ^ ^ Ming relates to a method for preparing a flame sensor and a burning appliance safety protection device using the method, in particular to flameout protection of the burning appliance, and belongs to the field of burning safety protection devices for mechanical engineering.

Background technique

^ ¥ In the technology, the safety device of the burner is equipped with a flame sensor. The weak conductivity of the flame ions can be used to produce so-called DC ions and AC ions supplied with a flame ion probe supplied with a DC power supply or a flame ion probe supplied with an AC power supply. Two flame sensors. The former is eliminated by AC because it cannot distinguish between the flame probe itself or the flame / air gap shorted by a conductor other than the flame. For example, the AC ion flame sensor is widely used in gas water heaters. Its shortcomings are: the AC probe signal source of the flame probe is generated by an electronic oscillator and a step-up transformer. The transformer is relatively bulky and inefficient, and its primary side often consumes more than 3 milliamps of dry batteries. Current, each flame sensor must match a corresponding AC detection signal source, so it is difficult to popularize it on a gas stove with multiple burners that needs to work for a long time. In the prior art, CN94220618 proposed a multi-fire head gas appliance rapid safety protection device, and its shortcomings are: the circuit structure is complicated, and the electromagnetic valve operating condition design is unreasonable; CN93241755 proposes a bimetal sheet and a permanent magnet cross-linking The shortcomings of the flameout protection device in the middle of the function are: the flameout protection has a long thermal inertia delay, the valve structure is relatively complicated, and each burner must be equipped with a corresponding flameout solenoid valve.

Summary of the Invention

The purpose of Mingming is to overcome the shortcomings of the prior art mentioned above, and provide a circuit structure that directly provides a detection signal source from one electronic oscillator to one or more monitored burner flame ion probes without using a step-up transformer. Four simple preparation methods for flame sensors with simple, low power consumption and small volume.

Another object of the present invention is to provide two kinds of safety devices for burning appliances with simple circuit structure, reasonable function and expandability, fast and reliable protection, low manufacturing cost, no power consumption in normal time, and minimal power consumption during combustion operation.

The third object of the present invention is to provide a magnetic holding solenoid valve for use with a safety protection device for a gas appliance, which has a manual valve opening, does not consume power in the valve opening state, and consumes only 0.15 to 0 when the valve is closed. The pulse working current of about 2A / 20mS has a simple and mature structure and technology, low cost, small size, and high reliability.

The object of the present invention can be achieved by the following measures:

A method for preparing a flame sensor, which uses one or more traditional flame ion probes to sample the flames of one or more monitored burner fire heads, is characterized by: setting two DC power sources E connected in series, and E ₂ , wherein the negative electrode of 5, and the positive electrode of E ₂ are connected to form the reference ground point G; one or more of the burner head 105 has high temperature resistance on at least one side of the flame of the flame ion probe immediately adjacent to the flame A casing or casing gasket or nozzle flame baffle made of conductive material is connected to point G; a detection circuit 112 is provided for each burner head 105, wherein a resistor R ₂ and a diode D, The anode is connected to node 107, and the cathode of the latter is connected to a parallel circuit of a resistor R and a capacitor C to node 108, and the other end of the parallel circuit R and C is connected to point G, The element R ₂ —D, — namely, constitutes the first branch of the detection circuit. A flame ion probe 103 is connected to the node 107, and an end of the flame near the nozzle flame is connected to the burner head 105. The shell or shell Pad or flame spout flame guard having a suitable width / space of the air gap 104, element R ₂ - 103- 104- 105 constitutes a second branch of said detection circuit; self-excited oscillator is a free electron transformer 101 continuously outputs a square wave or a sine wave or a triangular wave or a sawtooth wave or a step wave or a sequential pulse wave or the like through its output terminal 102 and the resistor R ₂ connected to it and during the monitoring process to the detection circuit 112 Any waveform signal in the waveform, as long as its swing amplitude 1 level is equal to or slightly less than the positive voltage value + V of the DC power supply E. _Q , the swing amplitude of 0 level is equal to or slightly higher than the negative voltage value of the DC power source-V; _D ; a level detection circuit 106 is provided, and its input terminal and node 108 Are connected, select the capacity of the capacitor C and the resistor 1, the threshold value of the level detection circuit 106, and the output waveform and frequency of the electronic oscillator 101, and make the resistance of the resistor R ₂ values greater than 1-5ΜΩ, the resistor R, R ₂ sufficiently larger than the resistance value obtained on the flame being monitored can 109 in the level discriminators circuit output terminal 106, a total of two kinds of the flame is extinguished Different logic signals; an electronic switch or voltage comparator 1 10 is provided, the input end of which is connected to node 107, and the potential difference between the output signal swing of node 107 and output terminal 102 is monitored by monitoring the potential difference between the two signals or the above two points A reverse current 1 ₃ occurs between, that is, the flame / air gap 1 04 can be obtained on the output terminal of the electronic switch or voltage comparator 110 or on the output terminal 1 15 of the inverter 114 connected thereto. There are two different logic signals that are shorted and open by a conductor other than the flame. The level detection circuit 106 is an electronic switch with a threshold value. When the electronic switch is a phase inverter, the monitored flame output at the output terminal 1 09 is 0 level, and the flame extinction is 1 Level logic signal. When the electronic switch 110 is an inverter or a non-inverter or the voltage comparator 110 is an operational amplifier, the flame / air gap 104 can be obtained by conducting electricity other than the flame on its output terminal 1 1 1. When the body is short-circuited, the output is a 1/0 alternate level logic signal. The method according to claims 1 to 3, characterized in that: when there are _n monitored burner heads 105, they should be set! !! Each independent sensor detects the circuit 112 and matches a common level-amplifier circuit 106 ', which has a positive-or gate or a positive-or-negative circuit with an n-line input terminal. When all the burner heads 105 burn normally, A logic signal with an output of 0 level or 1 level can be obtained at the output terminal 109 'of the level detection circuit 106'; when any one or more of the burner fire head 105 flames are extinguished, the output A logic signal with an output of 1 level or 0 level can be obtained at the terminal 109 '; a common electronic switch or voltage comparator 1 10' is provided, which is a positive NOR circuit with an n-line input terminal, when When any one or more of the flame / air gaps 104 that are monitored are short-circuited by a conductor other than a flame, they can be connected to the output terminals of the inverter 1 14 connected to the voltage comparator 110 ′. Get a logic signal with an output of 1/0 on 15.

A method for preparing a flame sensor, which uses one or more traditional flame ion probes to sample the flames of one or more monitored burner fire heads, is characterized by: setting two DC power supplies connected in series, and The negative electrode of 8, and the positive electrode of E ₂ are connected to form the reference ground point G; one or more of the burner fire head 105 is made of a high temperature resistant conductive material on at least one side of the flame of the flame ion probe immediately adjacent to the flame. The flame baffle of the nozzle of the casing or the body liner is connected to the G point; for each burner head 105, a detection circuit 1 1 2 is provided, wherein a resistor R ₂ is connected to the anode of a diode at the junction At point 107, a capacitor is connected across the cathode of the diode D, and point G, and the components R ₂ -D -C, that is, the first branch of the detection circuit, a flame ion probe 103 and a junction point 107 is connected, proximate one end of the spout a flame of the burner housing direct fire or flame spout housing liner or baffle 105 having a suitable width flame / gap space 104, element R ₂ - 1 03— 10 4—105 constitute the second circuit of the detection circuit; a self-excited electronic oscillator 101 without a transformer passes its output terminal 102 and the resistor R ₂ connected to it and sends it to the monitoring circuit during the monitoring process. The detection circuit 112 continuously outputs any waveform signal such as a square wave, a sine wave, a triangle wave, a sawtooth wave, a step wave, or a sequence pulse wave, as long as the swing level 1 level is equal to or slightly less than the DC power source. The positive voltage value of E, + V _UD , its swing level 0 level is equal to or slightly higher than the negative voltage value of the DC power supply E ₂ -V. . Setting a level detection circuit 106, whose input terminal is connected to the node 108, and adjusting the capacity of the capacitor, the threshold value of the level detection circuit 106, and the output waveform of the electronic oscillator 101 and frequency, and the resistance of the resistor is greater than 1-5ΜΩ, the resistor R, sufficiently larger than the resistance value of R _2, to the upper level discriminators circuit 106 output terminal 109 is obtained There are two different logic signals for monitoring the flame burning and flame extinguishing. An electronic switch or voltage comparator 1 1 0 is set, and its input terminal is connected to the node 107. Between the potential difference between the two points or the reverse current 1 ₃ between the two points, that is, the output terminal of the electronic switch or the voltage comparator 110 or the output terminal 1 15 of the inverter 1 14 connected thereto. A total of two different logic signals are obtained: the flame / air gap 104 is shorted by an electrical conductor other than the flame, and the circuit is open. The level discrimination circuit 106 is an electronic switch with a threshold. When the electronic switch is a phase inverter

Replace page 26 That is, the logic signal of the monitored flame burning output to be 0 level and flame extinguishing to 1 level can be obtained on its output terminal 109. When the electronic switch 1 10 is an inverter or a non-inverter or the voltage comparator 1 10 is an operational amplifier, the flame / air gap 104 can be obtained by conducting electricity other than the flame on its output terminal 1 1 1 When the body is short-circuited, the output is a logic signal with an alternating level of 1/0. When there are n monitored burner heads 105, n independent said sensor detection circuits 1 12 should be provided and matched with a common said level discriminating circuit 1 06 ', which has a positive OR gate with n line input ends. Or a NOR circuit, when all the burner heads 105 are burning normally, a logic signal with an output of 0 level or 1 level can be obtained on the output terminal 109 'of the level detection circuit 106'; when any When one or more of the burner head 105 flame is extinguished, a logic signal with an output of 1 level or 0 level can be obtained on the output terminal 109; a common electronic switch or voltage comparator is provided. 1 1 0 ', which is a positive NOR circuit with an n-line input terminal. When any one or more of the flame / air gaps 104 to be monitored is shorted by a conductor other than a flame, it can be connected to A logic signal having an alternating level of 1/0 is obtained on the output terminal 115 of the inverter 1 14 after the voltage comparator 1 10 ′.

A method for preparing a flame sensor, which uses one or more traditional flame ion probes to sample the flames of one or more monitored burner fire heads, is characterized by: setting two DC power sources E connected in series, and E ₂ , wherein the negative electrode of E and the positive electrode of E ₂ are connected to form a reference ground point G; one or more of the burner head 105 is resistant to at least one side of the flame of the nozzle immediately adjacent to the flame ion probe high temperature electrically conductive material of the pad or housing or housing spout flame guard and is connected to the point G; for each of a direct fire burner 105 are provided a detection circuit 112, wherein a resistor ₁₂ and a diode D, The anode phase is connected to the node 107, an electric «is connected across the cathode of the diode D, and the point G, and the elements R _2- D, once constituted, constitute the first branch of the detection circuit, A flame ion probe 103 is connected to the node 107, and an end of the flame near the nozzle is in contact with the casing or the casing gasket or the nozzle flame baffle of the burner fire head 105 with a flame of an appropriate width. / Space air gap 10 ⁴ , element R ₂ — 1 03 — 104 — 105 constitutes the second branch of the detection circuit; a self-excited electronic oscillator 101 without a transformer passes its output terminal 102 and the resistor R ₂ connected to it and During the monitoring process, any waveform signal such as a square wave, a sine wave, a triangle wave, a sawtooth wave, a step wave, or a sequence pulse wave is continuously output to the detection circuit 112, as long as the swing amplitude 1 level is equal to or It is slightly less than + V of the positive voltage value of the DC power supply. . Which swings the 0 level equal to or slightly positive value of the DC power supply negative voltage of a V. 5 ₂ „; A level detection circuit 106 is provided, the input end of which is connected to the node 108, the resistance value of the resistor ^, the threshold value of the level detection circuit 106, and the electronic oscillator 101 are selected. the output waveform of the frequency, and the resistance of the resistor R ₂ is greater than 1- 5ΜΩ, the sufficiently larger than the resistance of resistor _12, and to the electrical output level of the amplitude discriminator circuit 106 obtaining the terminal 109 is monitored flame, the flame is extinguished were two different logic signals; providing an electronic switch or a voltage comparator 110, the input terminal and the node ¹⁰⁷ is connected, by monitoring node 107 and the output terminal 1 02 The potential difference between the swing amplitude of the output signal or the reverse current between the two points can be output on the output terminal of the electronic switch or voltage comparator 110 or the output of the inverter 1 14 connected behind it. Two different logic signals are obtained on terminals 1 to 15 where the flame / air gap 104 is shorted and opened by a conductor other than the flame. The level detection circuit 106 is an electronic switch with a threshold value. When the electronic switch is a phase inverter A logic signal is obtained on its output terminal 109 for the flame output being monitored to be 0 level and the flame extinguishing being 1 level. The electronic switch 110 is an inverter or a phase inverter or the voltage comparator 1 10 is a When an operational amplifier is used, the flame / air gap 1 04 can be obtained on its output terminal 1 1 1 when it is short-circuited by a conductor other than a flame and the logic signal is output at an alternating level of 1/0. When there are n monitored combustions When the fire head 105 is used, n independent sensor detection circuits 112 should be provided and matched with a common level detection circuit 106 ', which has a positive OR gate or a positive NOR gate circuit with an n-line input terminal. When all the burner heads 105 are burning normally, a logic signal with an output of 0 level or 1 level can be obtained on the output terminal 109 'of the level detection circuit 106'; when any one or more of the burners burn When the flame of the device fire head 105 is extinguished, a logic signal with an output of 1 level or 0 level can be obtained on the output terminal 1 09 '; a common electronic switch or voltage comparator 1 1 0' is provided, which has Negative input NOR gate Way, when any one or more of the monitored fire

Substitute 26 When the flame / air gap 104 is short-circuited by a conductor other than a flame, logic of an output of an alternating level of 1/0 can be obtained on the output terminal 115 of the inverter 114 connected to the voltage comparator 110 ′. signal.

A method for preparing a flame sensor. A conventional flame ion probe 103 is used to sample the flame of a monitored burner fire head 105, which is characterized by: setting a DC power source E, whose negative electrode is the reference ground point G; The burner head 105 has a casing or a casing gasket or a nozzle flame baffle made of a high temperature resistant conductive material on at least one side of the nozzle flame adjacent to the flame ion probe, and is connected in parallel with a capacitor and a resistor. The circuit is connected to node 108, and the other end of the parallel circuit is connected to point G; a flame ion probe 103, one end of which is near the nozzle flame and the housing or housing gasket of the burner fire head 105 Or the nozzle flame baffle has a flame / air gap 104 with an appropriate width, elements 103-104 to 105-C, /, that is, a detection circuit 112 ′ constituting the flame sensor, wherein the optimal value of the resistor ^ Not less than 1-5MΩ; a self-excited electronic oscillator 101 without a transformer is connected to the flame ion probe 103 through its output terminal 102 and applies electricity to the detection during the entire monitoring process 1 12 'Continuous output of any waveform signal such as square wave, sine wave, triangle wave, sawtooth wave, step wave or sequence pulse, as long as the swing amplitude 1 level is equal to or slightly less than the DC power supply E, The positive voltage value + V _DD , its swing amplitude 0 level is equal to or slightly positive than the DC power source E, the negative electrode is the reference point G level value; a level detection circuit 106 is set, and its input terminal is in phase with the node 108 Connect, select and adjust the capacitance of the capacitor, the resistor, the threshold of the level detector circuit 106, and the output waveform and frequency of the electronic oscillator 101, then the level detector 106 A total of three different logic signals are obtained on the output terminal 109 of the monitored flame burning, flame extinguishment, and the flame / air gap 104 is shorted by a conductor other than the flame. The level detection circuit 106 is a threshold An electronic switch or a voltage comparator, when the electronic switch is an inverter or a voltage comparator at the inverting input terminal, the monitored flame output at the output terminal 109 is 0 level, and the flame is extinguished at 1 level. Flat Flame / air gap 104 is shorting conductor than the flame alternating three-level logic signal 1/0.

A gas appliance safety protection device includes a flame sensor, an interlock switch of a monitored burner gas control valve, a delay control circuit, a monostable pulse trigger circuit, a power drive circuit, a solenoid valve, a bistable trigger circuit, a photocoupler, An electronic switch and a DC power supply, characterized in that: the flame sensor 01 is one or more of the flame sensors according to claims 1 to 9, and the electronic oscillator 101 uses two cascaded CMOS inverter ICs. IC ₂ , a resistor R _{s is} connected to the input terminal of the CMOS inverter IC, a resistor R is connected to the output terminal of the IC, and the input terminal of the IC ₂ , and a capacitor C One end of the IC ₂ is connected to the output end and the output terminal 102 of the IC ₂ , and the other ends of the resistor R _s , the resistor R _t , and the capacitor C are connected at the same point, thereby forming a low-frequency multi-resonance with low power consumption. One or more of the shell or shell gasket or nozzle flame baffle of the burner fire head 105 is connected to point G of the reference ground, and each burner gas control valve is provided as a set A bipolar interlock switch LK, / LK ₂ , 'one of the pole switches L is opened when the gas control valve is opened and closed when the valve is closed, and one end thereof is in phase with the flame ion probe 103 Connected to node 108, the other end of which is connected to point G. The other pole switch LK ₂ of the bipolar interlock switch is switched off when the control valve is closed and turned on when the valve is opened. One or more than one The switches L connected in parallel are connected in series to the positive or negative main circuit of the DC power supply B; one or more diodes ¾ whose cathodes are respectively connected to the nodes 108 of the detection circuit 112 of the flame sensor 01 Its anode is connected in parallel with a movable ¾ LAC after being connected in parallel, and the other end of the LAC is connected to the + V _DD of the DC power source E, and constitutes an accident simulation test circuit 08; the electrical of the flame sensor flat amplitude discriminator circuit 106 is constituted by two cascaded CMOS inverters 1 and 1 (a _5-phase, the output terminal of the CMOS inverter 109 with the IC ₅ is connected to the anode of the diode _03, the diode D ₃ The cathode is connected in parallel to the node 109 ', and the input terminal of each CMOS inverter IC ₄ is connected to A parallel circuit of a capacitor and a resistor or only a capacitor C is connected to the node 108, the d and R, the other end of the parallel circuit or the other end of the capacitor is connected to the G point, a resistor One end of the resistor is connected to the output terminal 102 of the electronic oscillator 101, and the other end of the resistor is connected to the anode of a diode D, at the node 107, and the cathode of the diode D, is connected to the node 108. Connected to form a micro-power flame sensor detection circuit that monitors the burning or extinguishing of a flame 112; the electronic switch or voltage comparator 1 10 ′ is connected by an anode of one or more diodes 0 ₂ to a node 107 of the flame sensor detection circuit 112, and the cathodes of all the diodes D ₂ are connected in parallel A series circuit composed of a resistor R ₃ and a resistor ^ forms a positive OR gate circuit, the electrical and electrical connection points are connected to the base of the transistor T, and the emitter of the transistor T and the resistor ^ The other end is connected in parallel with the node 102, and the collector resistances of the triode T, ^ and +. . Are connected, the collector output terminal 111 of the transistor T, is connected to the input terminal of a CMOS inverter IC, the output terminal 115 of the CMOS inverter IC ₃ is connected to the anode of an independent diode D ₃ , the diode D the cathode ₅ and the node 109 'is connected; end of the resistor Rn and the cathode of the diode D ₃ is connected in parallel to a node 109', the other end of the resistor and a capacitor C, a resistor Rn and a parallel ^ Hfc circuit and a _L3 value of the resistor R is connected to the node a, the other end of the resistor R _L3 and a CMOS IC inverter input terminal ₈ is connected to the junction points b, capacitor Cn and a resistor R parallel circuit The other end is connected to the G point, thereby forming a micro power consumption delay control circuit 02 with a delay of several seconds; one end of a capacitor C _l2 is connected to the output terminal of the IC «at the node C, The other end is connected to the input terminal of an electrical «RH and a CMOS inverter IC, to the node d, and the other end of the resistor is connected to + V„ _B , thereby forming a pulse width of tens of milliseconds. the output terminal of the resistors R _l5 CMOS inverter IC, and -; pulse monostable trigger circuit 03 A Darlington T _u is connected to the base of the junction point e, the other end of the emission RiH _l5 and Darlington transistor is connected to the point G, the collector of the Darlington transistor T _u of electromagnetic The valve closing line 圏 DZF of the valve is connected to the node f, and a freewheeling diode Du and the valve closing coil DZF are connected in parallel to + V. Between _D and the node f, a pulsating power driving circuit 04 is formed and Form a basic burner safety protection control unit circuit 001; the anode of a diode D _2l is an S terminal, which is connected to the output terminal e of the CMOS inverter IC, the cathode of the diode D ₂₁ and the resistor R _3. Connected, the other end is connected to a CMOS XOR gate IC, the output end and a resistor R ₁₈ are connected to the node h, the two input ends of the CMOS XOR gate IC, are respectively two diodes The cathode of D „is connected, and the cathode of one of the diodes D„ is also connected to the cathode of the diode D ₂₁ and a resistor R _3. The other end of the resistor R ₃ is connected to the output terminal of the CMOS XOR gate IC. R _l8 h and electrically connected to a cathode of the other diode D ₂₂ is by an electrical «R ₃₁ is connected to the point G , Movable between an engagement button LAX and the capacitor C _2. After two connected in parallel across the diode D in parallel to the anode terminal of R ₂₂ and + V. ", Thereby constituting a flip-flop circuit 06 is initiated by a positive pulse ; resistor R _l8 and the other end of the resistor Rn and transistors and _Τ ι2 base connected to the junction point g, the emitter of the transistor and T _{12 is} the source resistor R, and the other end ₇ and is connected to the point G, the transistor T The collector load of ₁₂ includes a conventional accident sound and light alarm circuit 010 consisting of a light emitting diode and a sounder; a photocoupler 011 drives the light emitting diode D ₁₅ through a current limiting resistor and the accident sound and light alarm circuit 010 and the transistor T _l2 The collector electrode is connected to node j. When the monitored burner fire head 105 flame is extinguished or the flame / air gap 104 is shorted by a conductor other than the flame, the light-controlled thyristor of the photocoupler 011 is triggered and exchanged. The bidirectional thyristor CT connected in parallel with the contact switch K of the power grid is turned on and automatically starts an exhaust fan or a range hood, thereby forming an accident execution circuit 002. The electromagnetic valve is a magnetic protection installed on the gas inlet pipe of the gas appliance Solenoid valve 05, which is provided with a connecting rod that can move axially, the connecting rod passes through the valve body, and the cavity of the solenoid valve and the space outside the valve body are maintained by one or more sealing devices. Tightness, pressing the electromagnetic handle and the connecting rod to move inward and striking the intermediate rod to make the solenoid valve in a non-power-saving magnetically maintained normally open position, one solenoid valve closing coil DZF and one magnetic Keep the electromagnet 200 sealed in the valve body and automatically shut off the gas source under the accident pulse drive with a pulse width of not more than tens of milliseconds: when each of the gas burner gas control valves of the burner is in the closed position, set in the valve position The top of a light-touch button on the inner side of the operation panel of the gas appliance protrudes through a hole. The panel has a free height of 1L. When the gas control valve operation handle is rotated, the convex arc-shaped bead passes through the smooth transition surface and The plane of the inner edge of the bead presses the ejector rod to move inward, thereby forming the bipolar interlock switch I / LK _{2 that} works in interlock with the gas control valve.

A gas appliance safety protection device includes a flame sensor, an interlock switch of a monitored burner gas control valve, a delay control circuit, a monostable pulse trigger circuit, a power drive circuit, a solenoid valve, a bistable trigger circuit, a photocoupler, An electronic switch and a DC power supply, characterized in that: said flame sensor 801 is one of said flame relays according to claims 13 to 14. The electronic oscillator 101 uses two cascaded CMOS inverter ICs, IC ₂ , a resistor R _{s is} connected to the input terminal of a CMOS inverter IC, and one is electrically connected to the CMOS inverter IC. The output terminal of I d is connected to the input terminal of the IC _2. One terminal of a capacitor C is connected to the output terminal of the IC ₂ and the output terminal 102. The resistor R _s , the resistor R, and the capacitor C are connected to each other. Connected to the same point, thereby forming a low-power low-frequency multivibrator 1 01; a CMOS inverter constitutes the level discriminating circuit 1 06 of the flame sensor 801, and a moving button LAC After being connected in series with a resistor R _c and then connected to a parallel circuit of a capacitor and an electric amplifier R>, the parallel circuit is bridged between the input terminal of the IC ₄ and the G point; The casing or the casing pad or the nozzle flame baffle of the burner burner fire head 105 is connected to the parallel circuit and the input terminal of the 1 (: ₄ at the node 1 08, one of the One end of the flame ion probe 103 is connected to the output terminal 102 of the electronic oscillator 101, and the flame ion probe 103 The other end of the casing or the casing gasket or the nozzle flame baffle of the burner burner fire head 105 has a flame / space air gap 104 of an appropriate width; a DC power source E, the negative electrode of which The reference ground point G of the safety protection device of the burner, a single-pole interlock switch LK provided in combination with the burner gas control valve is connected in series to the positive or negative main circuit of the DC power supply E, The lock switch LK is opened when the gas control valve is closed and turned on when the valve is opened; an anode of a diode D ₃ is connected to the output terminal 1 09 of the CMOS inverter I of the flame sensor 801 The cathode of the diode is connected to one end of a resistor Ru at 09

', The other end of the resistor Ru is connected to a parallel circuit of a capacitor C _u and a resistor and a ^ H-value resistor Rn at the node a, and the other end of the resistor Ru is connected to a CMOS inverter 1 (: The input terminal of ₈ is connected to node b, and the other end of the capacitor Cu and electric R ₁₂ parallel circuit is connected to point G, thereby forming a micro-power delay control circuit 802 with a delay of several seconds; - one end of a capacitor C and an output terminal of the inverter ₁₂ 1 ₍₈ connected to the node c, and the other end to an electrical and a CMOS inverter 1 (; ₉ is connected to the input end of the node d, The other end of the electrical »RH is connected to + V _D ^, thereby forming a monostable pulse trigger circuit 803 with a pulse width of tens of milliseconds; an electrical» and an output terminal of a CMOS inverter IC and a Darlington The base of the tube Tu is connected to the node e, the other end of the resistor R ₁₅ and the emitter of the Darlington tube T are connected to the G point, and the collector of the Darlington tube Tu is connected to the electromagnetic field. DZF valve coil is connected to the node r, a freewheeling diode Du and closing valve and connected to the line between the rings of DZF + V _DD to node f, thereby forming a The power driving circuit 804 is operated to form a basic burner safety protection control unit circuit 8001. The solenoid valve is a magnetic holding solenoid valve 805 installed on the gas inlet pipe of the burner. A connecting rod that moves in a direction that passes through the valve body and maintains the necessary airtightness between the cavity of the solenoid valve and the external space of the valve body by one or more sealing devices, and presses the operation of the solenoid valve The handle and the connecting rod move inward and impact the valve stem to make the solenoid valve in a magnetically-maintained, normally-open position without power consumption. One of the solenoid valves, the DZF, and one magnetically held electromagnet 200 are sealed in the valve body. And automatically shut off the gas source under the accident pulse drive with a pulse width of not more than tens of milliseconds. When each gas burner gas control valve is in the closed position, a light The push rod of the button extends through a hole to extend the panel with a free height l. When the gas control valve operating handle is rotated, its convex arc-shaped bead presses the place through the smooth transition surface and the inner edge of the bead. The ejector lever is moved inward, thereby forming the single-pole interlock switch LK that is interlocked with the gas control valve.

The solenoid valve used in the safety protection device of a gas appliance is characterized in that: the side yoke 4 of the magnetic holding electromagnet 200 sealed in the valve body of the gas control valve is a simple magnet with a circular shape, An axial hole 32 is provided with an inner stop 61 and a smooth inner edge surface 62 at the open top end portion of the circular side yoke; the lower yoke 5 of the magnetic holding electromagnet is a piece A circular hole plate provided with a central shaft hole, and a convex circular ring guide bearing 51 is also provided on the outer side of the shaft hole, and the lower yoke 5 is embedded into the side magnet by a press interference fit. In the inner edge surface of the yoke, the optimal interference amount is not less than 0.02; the annular flange 63 of the yoke is also provided with two or more uniformly turned inward riveting points 64 The outer surface of the moving iron core 8 and the inner surface of the central shaft hole of the guide bearing 51 slide with a small clearance, and at their outer ends are also provided with an embedded in the inner surface of the guide bearing or The annular H-groove on the outer surface of the moving iron core or the stuffing box housing sealed at the end of the guide bearing Solid sealing rings or sealing packing 53; 8 in one end of the movable core bearing against the guide rail 51 is further

6 A limiting surface 81 is provided to control the working stroke of the moving iron core; between the moving iron core 8 and the central shaft hole of the magnetic holding electromagnet coil frame 以及 and between the magnetic holding electromagnet electromagnetic coil 6 and the sealed The inner wall space of the yoke iron of the magnetic holding electromagnet has a sufficient air gap 33 in order to eliminate the airbag damping phenomenon that may occur when the moving iron core makes axial movement. The upper yoke 1 is a circular yoke with an area equivalent to the projected flat area of the circular guide magnet. An auxiliary magnetic core 2 is provided at a central portion thereof, and an axial center portion outside the auxiliary magnetic core 2 is further provided. A convex cylindrical body 38 and a hollow nut 15 are connected to the cylindrical body 38 as a whole.

Brief description of the drawings Figure 1. Schematic diagram of the flame sensor 1 embodiment 1

Figure 2.Schematic diagram of flame sensor 2

Figure 3.Schematic diagram of flame sensor 3

Figure 4. Schematic diagram of flame sensor 1 embodiment 2

Figure 5.Schematic diagram of flame sensor 4

Figure 6.Example of a flame sensor electronic oscillator

Figure 7.Example of a flame sensor electronic switch or voltage comparator

Figure 8. Burner safety protection device embodiment 1

Figure 9. Burner safety protection device embodiment 2

Fig. 10 Schematic diagram of the magnetic holding solenoid valve embodiment

Figure 11.Electromagnetic Example of Magnetic Holding Solenoid Valve

Fig. 12 Example of crusting of moving magnetic core of magnetic holding solenoid valve and guide bearing sealing device

Fig. 13 Example of interlocking contact for burner control valve of burner

Best Mode of the Invention

Fig. 1 shows embodiment 1 of a schematic diagram 1 of a flame sensor with a monitored burner head.

A conventional flame ion probe 103 was used to sample the flame of a monitored burner head 105, and two DC power sources E and E _{2 were} set in series, where the negative electrode of E and the positive electrode of E ₂ were connected Form reference point G. The burner fire head 105 has a casing or a casing gasket or a nozzle flame baffle made of a high-temperature resistant conductive material on at least one side of the nozzle flame of the flame ion probe, and is connected to the G point. For each burner head 105, a detection circuit 1 12 is provided: its first branch is connected to the anode of the diode D, at the junction 107, the cathode of the latter is connected in parallel with the resistor ^ and the capacitor The circuit is connected to the node 108, the other end of the parallel circuit is connected to the G point, and the element-D '-CJ / R, constitutes the first branch of the detection circuit. One end of a flame ion probe 103 is connected to the node 107, and the other end of the flame near the nozzle flame is connected to the casing or casing liner or nozzle flame baffle of the burner head 105 with a suitable flame / The air gap 104 has a value of about 1 to several millimeters, and the element R ₂ — 1 03 — 1 04 — 1 05 constitutes a second branch of the detection circuit. A free-running oscillator electronic transformer 101 through its output terminal 102 and the resistor ₁₂ connected thereto and to 112 continuous sine or square wave output of said detection circuit (Semi during monitoring Any triangle wave or sawtooth wave or step wave or sequence pulse wave or any other waveform signal, as long as its swing amplitude 1 level is equal to or slightly less than the positive voltage value + V. _{D of the} DC power supply _D , which The swing amplitude 0 level is equal to or slightly higher than the negative voltage value of the DC power supply E ₂ -V. _u . The input terminal of a level detection circuit 1 06 is connected to the node 1 08, and the selection capacitor (^ and resistor R The capacity and level of the threshold amplifier circuit 106 and the output waveform and frequency of the electronic oscillator 101, and the resistance value of the resistor is greater than 1-5MΩ, so that the resistance ratio of the resistor R to R ₂ is sufficient. Large, for example, about 5 to 10 times, two different logic signals can be obtained on the output terminal 1 09 of the level detection circuit 10 06, the flame being monitored and the flame being extinguished. An electronic switch or voltage comparator The input of 1 1 0 is connected to node 1 07. The monitoring node 107 and the potential difference between the above two or swing output signal at an output terminal 102 for The reverse current ι ₃ between them can be obtained on the output terminal 111 of the electronic switch or voltage comparator 110 or on the output terminal 115 of the inverter 114 connected to the flame / air gap 104 outside the flame. There are two different logic signals for the short-circuited and open-circuited electrical conductors. The level discrimination circuit 106 is a CMOS gate circuit with a threshold in-phase or inverting output, or a MOS field effect transistor, or a junction field effect transistor, or a transistor, or a single junction transistor, or an IGBT tube, or A Schmitt trigger, or a voltage comparator, or a thyristor, or a switchable thyristor combination triode, or an operational amplifier. When the level detection circuit 106 is an inverter, two different types of signals can be obtained on its output terminal 109: the monitored flame burns to 0 level and the flame goes out to 1 level. In the following, the working principle of the flame sensor will be described in combination with the working condition of the flame burner: When the flame is extinguished, it is assumed that the electronic oscillator 101 outputs an upper swing, that is, a 1-level signal + V _D. The second branch of the detection circuit 112 exhibits infinite resistance due to the air gap 104, L = 0, and the first branch R ₂ — II R, then the current I ,,

C, is fully charged, and the potential at the node 108 basically reaches 1 level +. . value. As the signal source 101 outputs a swing amplitude of 0 level and 1 V. . ,

D, backstop, I, = 0, C, discharge to the load and the input resistance of the element 106, the potential at the node 108 begins to slowly drop, and before reaching the threshold voltage of the level detection circuit 106, the 0 of the signal source 101 When the level signal ends, the second 1-level signal and the subsequent second 0-level signal arrive one after another. Therefore, a continuous 1-level signal can be obtained at the output terminal 109 of the in-phase element 106. When the flame burns, because the flame's polarized current has a certain unidirectional conductivity, the second branch of the detection circuit 112 — 103 — 104 — 105 is turned on by the 1 level of the signal source 101 and flows a current 1 ₂ Since the resistance value of R ₂ is selected to be greater than Γ5MΩ, which is sufficiently larger than the flame equivalent resistance of the flame gap 104, the node 107 is first clamped to a level close to 0 (for the G point, the same applies hereinafter), and the current can be Considered as a value of 0, the current 1 _{2 is} generally a few tenths of a microampere, so that the output terminal 109 of the non-inverter level detection circuit 106 outputs a 0 level. When the flame / air gap 104 is shorted by the probe itself or the conductive liquid, the element 106 cannot be recognized, so the output of the terminal 109 is still at 0 level. At this time, it is assumed that the output signal of the signal source 101 is still 1 level, because the equivalent resistance of the shorted 104 generally does not exceed 300KΩ, and has no polarity, so the node 107 at this time is 0 level G, electronic switch One end of the power terminal of the voltage comparator 110 is + V _D. The other end is the 1 level of terminal 102, that is, + V _D. Therefore, when the power source fails to be connected, when the sway amplitude 0 level of the signal source 101 appears, if the short-circuit state of the component 104 remains unchanged, the component 110 is automatically connected to the power source + V _D. / V _DD , the level of the G point is basically present at the node 107, therefore, the electronic switch or the voltage comparator 110 is turned on, and a reverse current flows through the second branch of the detection circuit. At this time, it is assumed that the electronic switch 110 is a A triode inverter, whose output terminal 110 outputs a 1 / G alternating level signal. If an inverter 114 is connected to the rear side of the electronic switch 110, the power source of the element 114 is connected to + _VD . At this time, the logic signal of the flame / air gap "short circuit" accident with an alternate output level of 1/0 can be obtained at the output terminal 115 of the inverter 114.

Fig. 2 shows an embodiment of a flame sensor principle diagram 2 with a burner fire head monitored.

What is different from FIG. 1 is that this embodiment uses a capacitor C to dare to replace the parallel circuit shown in FIG. 1. As long as the proper capacitor capacity and the oscillation frequency and waveform of the electronic oscillator and the threshold voltage of the level amplitude detection circuit are selected, when the electronic oscillator 101 finishes outputting a 0-level signal, the capacitor plate voltage (that is, The voltage at the node 108 to the reference ground G point) still has a residual value sufficient to maintain the input signal level of the level detection circuit 106, so as to avoid the logic abnormality of the detection circuit 106 caused by the input terminal "floating" accident. In addition, the component number, circuit structure and working principle, and output logic level signal of Figure 1 are exactly the same as the description of Figure 1.

Fig. 3 shows an embodiment of a flame sensor principle diagram 3 with a burner fire head being monitored.

What is different from FIG. 1 is that this embodiment replaces the Cj R shown in FIG. 1 with a resistor ^ in parallel. Because the input capacitance of the level detection circuit 106 is generally small, the node 108 is not enough to integrate the alternating signal output by the electronic oscillator 101, so when the flame of the monitored burner goes out Only the logic signal with an alternate level of 1/0 can be output on the output terminal 109 of the level discrimination circuit 106. In addition, the component number, circuit structure and working principle of Fig. 3 and the logic signal output during the combustion state are all the same as those of Fig. 1.

Fig. 4 shows a second embodiment of a flame sensor principle diagram 1 with more than one burner fire head being monitored. Each burner

8

Replace page 26 The fire head is provided with a separate detection circuit 112, but it can share a level detection circuit 106 ', which is a positive OR gate or positive NOR gate circuit with an n-line input terminal, and the remaining related component numbers, circuit structure and working principle And the output level logic signal is exactly the same as the description of FIG. 1.

When all the burner heads 105 burn normally, a logic signal of level 0 or 1 can be output on the output terminal 109 'of the level detection circuit 106. When any one or more burner heads 105 When the flame is extinguished, two different logic signals with output level 1 or level 0 can be obtained; and so on, a flame sensor with n detection circuits 112 can also be provided with a common electronic switch or voltage comparator 110 ', It is a positive NOR circuit with an n-line input terminal. When any one or more of the flame / air gap 104 monitored is shorted or opened by a conductor other than the flame, it can be connected to the voltage. The output terminal 115 of the inverter 114 after the comparator 110 ′ obtains two different logic signals of corresponding 1/0 alternate output level and 0 level, and the working principle is exactly the same as that described in FIG. 1.

Fig. 5 shows the embodiment of Fig. 4 of a flame sensor with a monitored burner head. A conventional flame ion probe 103 is used to sample the flame of the burner fire head 105 to be monitored, and a DC power source is set with the negative electrode as the reference ground point G. One of the burner fire heads 105 has a casing or a casing gasket or a nozzle flame baffle plate made of a high temperature resistant conductive material on at least one side of the nozzle flame of the flame ion probe, and is formed with the capacitor C1 and the electric R1. The parallel circuit is connected to the node 108 and the optimal value of the electrical appliance R1 is not less than 1 ~ 5MΩ. The other end of the parallel circuit is connected to the G point. A flame ion probe 103 is located near the nozzle flame. One end of the housing or housing gasket or nozzle flame baffle of the burner head 105 has a flame / air gap 104 of an appropriate width, with a value of about 1 to several millimeters, and a self-excited electron without a transformer. The oscillator 101 notifies its output terminal 102 to be connected to the other end of the flame ion probe 103 and continuously outputs a square wave or a sine wave to the element 103-104-105-d II R, a detection circuit formed during the entire monitoring process. (Including half ^) or triangle wave, sawtooth wave, step wave or sequence pulse wave, and any other waveform signal, as long as its swing amplitude 1 level is equal to or slightly less than the positive voltage value of DC power supply E, + V _DD, a lower power swings 0 Is equal to or slightly positive to the negative value of the DC power source E, that is, the reference ground point G level value; the input terminal of a level detection circuit 106 is connected to the node 108, and the capacity of the capacitor C, and the voltage I ^ R, and The threshold value of the level amplitude detection circuit 106 and the output waveform and frequency of the electronic oscillator 101 can be obtained on the output terminal 109 of the level amplitude detection circuit 106. The monitored flame burns, the flame is extinguished, and the flame / air gap 104 is Electrical conductors other than the flame are shorted to a total of three different levels of logic signals.

It can be seen from FIG. 5 that the flame ion probe 103 is connected in series in a parallel circuit composed of C _t and R, and the DC power source has only one E, but despite this, its working principle is: using an electronic oscillator 101 as a signal The main technical characteristics of the source and a level detection circuit 106 for sampling the working conditions of the parallel circuit are exactly the same as the description of the flame sensor principle 1 shown in FIG. 1. The difference is that the second branch of the detection circuit 112 is eliminated, and the flame ion probe 103 is connected in series in the detection circuit 112 '. When the flame / air gap 104 is shorted by the probe itself or a conductor other than the flame, the reverse current 1 ₃ is 108-105-104-103-102-101-G, and the potential of the node 108 follows the output terminal 102 The amplitude of the signal changes synchronously, so that a logic signal with an alternate output level of 1/0 is obtained on the output terminal 109.

Fig. 6 shows an embodiment of a flame sensor electronic oscillator.

The power supply of an operational amplifier 1IC is connected to + V _D. / — Above V _DD or + V _DD / G, the resistors 5R, 3R, 4R and capacitor 1C form the feedback network of the operational amplifier. The connection method is shown in FIG. 6, which is a well-known standard multi-resonance oscillator. The output end of the amplifier and the operational amplifier are connected to the output terminal 102. The present invention has no strict technical limitation on the duty cycle of the multivibrator.

Fig. 7 shows an embodiment of an electronic switch or voltage comparator of a flame sensor.

Fig. 7a) shows a first embodiment of a transistor. The resistor R _{3 is} connected to the node 107, the other end is connected to the base of the transistor 1 \, the emitter of T, is connected to the output terminal 102, and the collector resistance R _{5 is} connected to + or 6 points, the collector The output terminal 111 is connected to the input terminal of the CMOS inverter 114. The output terminal of the latter is 115. The negative electrode (V _ss ) of the inverter 114 is connected to a V ,, and the positive electrode is connected to + V _DD . When the flame / air gap 104 is shorted by the probe itself or a conductor other than the flame,

Replace Reverse current 1 ₃ by G- 105- 104- 103- 102- V. . . When the signal source 101 outputs a swing level of 1 level, ^ is not connected to the power source, terminal 111 is at a 1 level, and terminal 115 outputs a level of 0; when the signal source 101 outputs a swing level of 0 level, the above 1 is triggered. ₃ trigger T, turn on, the node 111 is clamped to a V _DD by 7 \, so terminal 115 outputs 1 level, if it is reciprocating, you can get "short circuit" with output of 1/0 alternating level on terminal 115 "Accident logic signal.

Fig. 7b) shows an embodiment 2 of an NMOS transmission gate. In order to prevent the back gate from damaging the transmission gate, the substrate of NM0S is connected to terminal 102 via a non-return diode D, the D pole is connected to point G, the G pole is connected to node 107, and the S pole is connected to terminal 111. When the flame When the "short circuit" accident occurs between the air gap and the air gap, the transmission gate is turned on to output 1 level (G level). After the inverter 1 to 14 level conversion, the output can be obtained at terminal 115 as 1/0 alternately. Level logic signal.

Fig. 7c) shows a third embodiment of an operational amplifier. The non-inverting input terminal of an operational amplifier is connected to the node 107, and the resistors 1R and 2R are connected in series across a V. . With + V _D. Above, the inverting input terminal of the op amp is connected to the common contact point of the resistors 1R and 2R, and the resistance ratio of 1 R and 2R is set so that the inverting terminal of the op amp obtains a slightly higher than one V. The threshold voltage of the _D level, when a "short circuit" accident occurs in the flame / air gap 104, a logic signal with a 1/0 level alternate output can be obtained on the terminals 1-15.

Fig. 8 shows a first embodiment of a safety protection device for a burner using the flame sensor of the present invention.

The flame sensor 01 is one or more of the flame sensors according to claim 1, and the electronic oscillator 101 thereof uses two cascaded CMOS inverters Id, IC ₂ , a resistor R _s and an inverter. 1 (; ₂ input terminals are connected, electric it is connected to the output terminal of the inverter Id and the input terminal of the inverter ICa, one end of the capacitor C is connected to the output terminal of the inverter IC ₂ and the output terminal 102, Components! ^ And ^ are connected to the same point with the other end of C, thereby forming a low-power low-frequency multivibrator. One or more of the burner burner fire head 105 and the reference ground point G Connected, each burner gas control valve is equipped with a bipolar interlock switch I / LL. One of the pole switches I is opened when the gas control position is opened and closed when the valve position is closed. One end of I is connected to the flame ion probe 103, and the other end is connected to point G. The other pole switch of the bipolar interlock switch is disconnected when the gas control valve is closed, and is connected when the valve is opened. One or more switches I connected in parallel are connected in series to DC In the positive or negative main circuit of the power source E, one or more diodes ^ whose cathodes are respectively connected to the nodes 108 of the detection circuit 112 of the flame sensor (01), and their anodes are connected in parallel with a movable button The LAC is connected, and the other end of the LAC is connected to + V „. They are connected to form an accident simulation test circuit 08. The level detection circuit 106 'of the flame sensor is composed of two cascaded CMOS inverters and _{15 to} form a same phase devices, IC, an output terminal 109 of the anode of the diode D ₃ is connected, in parallel to the diode D ₃ is connected to the cathode of the node 109 ', the resistor R _2, a diode D ,, capacitor and a resistor (^ parallel circuit, flame The ion probe 103, the flame / air gap 104, the casing of the burner head or the casing gasket or the nozzle flame baffle constitute a detection circuit 112 of the flame sensor shown in FIG. 1, and its detailed structure and description refer to FIG. 1 and FIG. 4, this embodiment is not repeated, and thus constitutes a micro-power consumption detection circuit that monitors the burning or extinguishing of the flame of the burner head. The electronic switch or voltage comparator 110 'includes one or more two poles. Anode 107 are connected to the flame sensor node detection circuit 112, the series circuit is electrically connected in parallel with their cathodes electrically P and R ₃ and composed of a composition or a positive gate circuit, and the electrical resistors R ₃ P The common connection point of the device is connected to the base of the transistor L, the emitter and the other end of the device are connected in parallel with the node 102, the collector resistance R ^ + V _DD is connected, and the collector output terminal 11 1 Connected to the input terminal of the CMOS inverter IC _S , the output terminal 115 of the inverter IC is connected to the anode of an independent diode ₀₃ , and the cathode of the diode D ₃ is connected to the node 109 '.

One end of the resistor Rn is connected in parallel to the node 109 ′ with the cathode of the diode D ₃ , and the other end of Ru is connected to the parallel circuit composed of the capacitor Cu and the resistor Rn and a one-value resistor Rn to the node a, R. The other end of ₁₃ is connected to the input of the CMOS inverter IC ₈ at node b, and the other end of the parallel circuit of Cn and Ru is connected to point G, thereby forming a micro-power delay control with a delay of several seconds. Circuit 02. One end of the capacitor C _l2 is connected to the output terminal of the inverter at the node C, and the other end thereof is connected to the resistor RH and the CMOS inverter IC, and the input terminal is connected to the node d, and the other end of the RH is connected to + V _DD is connected by this group

10

Replace A monostable pulse trigger circuit 03 with a pulse width of tens of milliseconds is formed. Resistor R and an inverter IC, and the output terminal T _u a Darlington transistor connected to the base of the junction point e, the emitter of the other end of the point G and K ^ R Darlington connected The collector of the triode T, and the valve closing line DZF of the solenoid valve 05 are connected to the node f, and the freewheeling diode D „is connected in parallel with the DZF at + V _DI and the node f, thereby forming A pulsating power drive circuit 04 constitutes a basic burner safety protection control unit circuit 001.

The anode of the diode D _2l is an S terminal, which is connected to the output node e of the inverter IC, and the cathode of the diode D ₂ , and the resistor R ₃ . Phase connection, the other end of resistor 1 and CMOS XOR gate IC. The output terminal and the resistor R _l8 are connected to the node h, the XOR gate IC. The two input terminals respectively connected to the cathode of the two diodes D _22, D ₂₂ wherein a cathode is further connected to the cathode of the diode ^, the cathode of the other diode D "is connected through a resistor R _3I and point G A switch button LAX and a capacitor C ₂ connected in parallel are connected to + V. The other end of them is connected to the R terminal of the two anodes of the diode D ₂₂ in parallel, thereby forming a circuit consisting of Positive pulse start bistable trigger circuit 06.

The resistor R, _{8 is} connected to the node h, and the other end thereof is connected to the resistor R , _; and the base of the transistor T ₁₂ is connected to the node g, and the emitter of the transistor T ₁₂ is connected to the other end of the resistor Rn. Parallel to point G, the collector load of the transistor T ₁₂ includes a conventional accident sound and light alarm circuit 010 composed of a light emitting diode and a sounder. For the sake of redundancy, this embodiment will omit this well-known technology.

A photocoupler 011 drives the light-emitting diode D, ₅ through a current-limiting resistor R, and is connected to the collector of the accident sound and light alarm circuit 010 and the collector of the transistor T ₁₂ at the node j. When the burner fire head 105 is monitored, When the flame is extinguished or the flame / air gap 104 is "short-circuited" by a conductor other than the flame, the light-controlled thyristor CT of the photocoupler 011 is triggered by the conduction state of the triode 1 \, and has contact with the AC power grid. The bidirectional thyristor CT connected in parallel with the switch K also triggers conduction and starts an exhaust fan or a range hood, thereby forming an accident execution circuit 002.

The solenoid valve is a solenoid valve 05 installed on the inlet side of the burner burner. It is provided with a connecting rod 202 sealed to the valve cavity. The solenoid valve handle and the connecting rod are pressed inward and impact the valve rod. The solenoid valve is in a magnetically held normally open position with no power consumption. A valve closing line DZF and a magnetically held electromagnet 200 are sealed in the valve body and automatically shut off the pipeline gas source under the accident pulse drive with a pulse width of no more than tens of milliseconds. . Integrated circuits IC ,, IC _;, 1 (: ₅ share a CD4069 six-inverter chip; integrated circuits 2 IC 2 IC _¾ , IC ₈ , IC, use another CD4069 chip; integrated circuit Id—IC ₃ power source is + V ..., V _{ss is} connected to a V. _u ; the power supply of the remaining integrated circuits is + V _DD , and V _{ss is} connected to the G point.

In the normal use process, as long as the handle of the solenoid valve 05 is manually pressed to keep the solenoid valve in the open position without power consumption for a long time, the traditional gas appliance control valve is rotated or pressed, and then the gas (or fuel) enters The burner ignites the flame through a traditional electronic ignition or piezoelectric ignition device, and the burner burns normally. At the same time, a group of unipolar dynamic sub-switches IX interlocked with the burner control valve is turned off, and the other pole-operated interlocking switch LK _{2 is} turned on 5. The main circuit and the electronic oscillator 101 start and vibrate by themselves. The square wave signal is output to the detection circuit 112. Therefore, the burning flame connects the second branch of the detection circuit, and the node 107 is clamped to a level 0 near the G point, the node 108 and the node Points 109 and 1 09 'are both at the 0 level. Period, if the appliance has a burner control valve in a valve open position corresponding to the ignition system of the flame is extinguished or not during ignition pilot flame, the potential of the node 108 rises to a level immediately, with the phase IC "IC ₅ with The terminal 1 09 'outputs 1 level, the integration circuit Ru, Cu starts to delay, and the node a reaches the threshold voltage of the inverter IC ₈ within a predetermined number of seconds (generally set to 4-7 seconds). The inverter IC ₈ flips, and the node C reaches the 0 level instantaneously. Because the potential of the two sides of the electrode plate of the capacitor Cu cannot be changed suddenly, the node d outputs a 0-level monostable trigger signal with a pulse width of tens of milliseconds to trigger the inversion. The phaser IC flips and pushes the transistor T _{η to} open, the closing coil DZF of the solenoid valve 05 is reversely excited, and the magnetic holding solenoid valve automatically cuts off the gas or liquid source of the burner. At the same time, the bi-stable trigger circuit 06 The S terminal is activated by a 1-level trigger pulse to enable the XOR gate IC. The triode T _{l2 is} flipped and triggered to open, and the accidental sound and light alarm circuit composed of the conventional method 0 1 0 is turned on and the sound and light alarm signal is issued. Primary side of coupler When opened, the light emitting diode D ₁₅ is turned on, a light control thyristor AC CL CT Triac trigger conduction, mounted

1 1

Fine 26 The exhaust fan or range hood on the burning appliance site was forcibly started to discharge the gas released during the flameout accident to the outdoor space and to avoid the accident that the traditional electrical switch κ accidentally closed the ignition arc and the leaked gas met to form an explosion accident. (If the bi-stable trigger circuit 06 is a negative pulse trigger type, the trigger pulse output terminal can be connected to node f instead.) After receiving the accident alarm signal, just turn off the gas control valve and press the accident elimination button LAX. The bistable trigger circuit 06 is reset and the transistor T _{12 is} turned off. After two years of practice, it is very necessary to set an action delay of 4-7 seconds in the safety device of the burning appliance, which avoids filling the gas pipe of the burning appliance with air, the ignition failure, and the flame temporarily drifting away from the Transient processes such as the gap 104 cause the safety protection device to malfunction. In order to regularly check the reliability of the above-mentioned safety protection device, the user may manually press the button LAC of the accident simulation test circuit 08 during the normal combustion process of the gas appliance after a period of time, for example, within 3 months. Set the time delay in a few seconds, the safety device of the burning appliance will automatically close the solenoid valve and cut off the gas or fuel liquid source and the burning flame, and send the corresponding sound and light alarm signal to achieve the purpose of periodic detection reliability. When the flame / air gap 1 04 is shorted by the flame ion probe 1 03 itself or the overflowing soup liquid, such as kettles, cookers, etc. heated by the burning appliance, in order to prevent the false signal of the normal burning of the flame and to prevent danger gas leakage accident, the above-mentioned reverse current detection circuit generating the second branch ₁₃ of the triac 1 \ IC ₃ and the inverter is turned on, inverted output node 115 1/0 alternating "short The "1 level part of the logic signal of the accident" will be introduced into the node 109 'via the positive OR gate D. The above-mentioned control unit circuit 001 and accident execution unit circuit 002 will start work on time. The specific protection process is the same as the aforementioned "fireout" accident. The process is exactly the same. At this time, since the 1/0 alternating pulse is output, the integration delay of the delay control circuit 02 will be increased more than the protection delay of the "flaming accident".

Obviously, this embodiment mainly provides two basic protections of accident "flaming out" and accident "short-circuiting", but as long as the output signals of other sensors, such as earthquake, fuel or gas pressure overpressure, and smoke, are adjusted to 1 electrical The flat signal (the present invention is designed according to positive logic) and connected to the node 109 'or the node e, can simply and effectively expand the protection function of the safety protection device of the burner of the present invention.

Fig. 9 shows a second embodiment of a safety device for a gas appliance having a monitored burner head 105. It has a flame sensor 01 as defined in claim 13. In this embodiment, two cascaded CMOS inverters and a feedback network are also used to form a self-excited electronic oscillator 101. The flame sensor 01 and the electronic For component numbers, circuit structures, and operating principles of the oscillator 101, reference may be made to the description of FIG. 5 and FIG. 1, and this embodiment will not be repeated. The difference from the embodiment of FIG. 8 is that: the burner gas control interlock switch LK in this embodiment is only a set of single-pole switch-on and switch-on, which is turned on when the valve is in the open position, and is turned off when the valve is in the closed position. Into the positive or negative main circuit of the power supply E ,. The accident simulation test circuit 08 is composed of a low-value resistor R _{c of} several thousands of ohms and a moving button LAC in series and is connected in parallel with the node 108 and the point G. When simulating an accident state, just press LAC to exceed the set delay, the level detection circuit 106, that is, the output of the CMOS inverter IC ₄ immediately outputs a 1-level accident logic signal, the control unit circuit 8001 and the accident execution unit Circuit 8002 will start working on time. Regarding the configuration of the control unit circuit 8001 and the working principle of the accident "flaming out" and the accident "short-circuiting", reference may be made to related descriptions such as FIG. 5 and FIG. 8, which are omitted and not repeated in this embodiment. In this embodiment, only a CD4069 CMOS six-inverter chip is needed to meet all the IC circuit requirements of the flame sensor 01 and the control unit circuit 8001. It can be seen that the structure is very clever, simple, and inexpensive.

In summary, in order to clearly and completely illustrate the flame sensor according to the present invention in four different types, the level detection circuit 1 06 (1 06 ') and the electronic switch or voltage comparator 1 1 0 (1 10 ') The logic level signals output under the three different working conditions of the flame sensor are briefly described in the special list: terminal 1 09 output level terminal 1 15 output level flame sensor flame / air gap 104 Level-amplifier circuit 106 type electronic switch or voltage comparator 11 type 0 working condition (160 ') type

(1 10 ') Inverter inverter Inverter inverter schematic 1 A, normal combustion 0 1 1 0 claim 1 B, flameout accident 1 0 1 0

(See Figure 1) C. Short-circuit accident 0 1 1/0 alternate 1/0 alternate Schematic 2 A, Normal combustion 0 1 1 0 Claim 5 B, Flameout accident 1 0 1 0

(See Figure 2) C. Short-circuit accident 0 1 1/0 alternate 1/0 alternate Schematic 3 A, Normal combustion 0 1 1 0 Claim 9 B, Flameout accident 1/0 alternate 1/0 alternate 1 0

(See Figure 3) C. Short-circuit accident 0 1 1/0 alternate 1/0 alternate Schematic 4 A, Normal combustion 1 0

Claim 13 B. Flameout accident 0 1

(See Figure 5) C, short circuit accident 1/0 alternate 1/0 alternate

FIG. 10 is a schematic structural diagram of an embodiment of a solenoid valve used in conjunction with the safety protection device of the burning appliance. The entire valve body is fixedly mounted on the internal space structure of the appliance. (This figure is omitted for the part related to the gas appliance.) The solenoid valve described in this embodiment is a two-position two-way cut-off type magnetic holding solenoid valve. The shaft of the valve is provided with a cavity, one side of which is in communication with the air inlet 216, and the middle of the cavity is provided with a control port 217, which is in communication with the air outlet 218 on the other side of the cavity. A magnetically held solenoid 200 of a solenoid valve is hermetically mounted on the lower end valve seat 205 of the cavity. It has an axially moving valve stem 10, a piece that is installed and positioned by accessories such as springs 9 and pallets. The valve plug 11 is installed at the other end of the valve stem 10, and at the upper end formed by the cavity and the control port, the same axis as the valve stem 10 is provided with a through hole 243 on the top of the valve body 204, a shaft The connecting rod 202 moving in the through direction passes through the through hole 243, and their cross-sectional areas should match each other, and the cavity and the external space of the valve body should be maintained at a certain air pressure through one or more fixed sealing devices 233 installed on the inner wall of the through hole. Density. A flap 203 is rigidly connected to the valve stem. A spring 231 is provided between the flap and the control port. Under the action of the spring tension, the connecting rod 202 moves outward and is limited by the flap and the inner plane of the upper end of the cavity. Bit. A handle 201 is installed at one end of the connecting rod extending from the valve body, and a hole 637 of the operation panel 602 of the gas appliance emerges—a sufficient operating height ΔΗ. The other end of the connecting rod 202 is connected with the sheet valve plug 11 and the valve stem 10 An appropriate axial clearance ΔΗ 'is left. In the natural state, the sheet-shaped plug 11 closes the control port 217 under the tension of the spring 9, and at this time, the air inlet and the air outlet of the solenoid valve are tightly cut off. Manually pressing the handle 201 and the connecting rod 202, forcing the sheet valve plug 11 and the valve rod 10 to move axially inward and striking the valve rod 10 while driving the moving iron core 8 of the magnetic holding electromagnet 200 to move inward and assisting The magnetic core 2 is matched, and the entire connecting rod and the handle are restored to the original state under the tension of the spring 231 after releasing the hand, but at this time, because the polarization magnetic circuit of the electromagnet is closed, the control port after the air inlet is opened and the The air outlet is connected, and the magnetic holding solenoid valve is in a manual valve opening position without power consumption, as shown in FIG. 10b).

FIG. 11 shows an embodiment of a magnetic holding electromagnet of the magnetic holding solenoid valve. It is a new invention formed by further improvement based on the authorized patent CN89105949.0 obtained by the inventor. It can be seen from FIG. 10 that FIG. 11 shows only the core part of the solenoid valve for the safety protection device of the appliance: that is, one of the magnetic holding electromagnet 200 and the valve stem 10, the sheet-shaped plug 11, the return spring 9, etc. are cut off Sectional sectional view of a magnetically held solenoid valve. As a complete safety protection valve, FIG. 11 has omitted the conventional valve body, seat, connecting rod, connecting rod sealing device and operating handle. Among them, the upper yoke 1, the permanent magnet 3, the side yoke 4, the lower yoke 5, the rail bearing 51, the fixed magnetic core 2, and the moving iron core 8 constitute a polarization magnetic circuit of the magnetic holding electromagnet 200; and the side yoke 4, The lower yoke 5, the rail bearing 51, the moving iron core 8, the auxiliary magnetic core 2, the electromagnetic coil 6 and the through-core insulating sleeve 21 form the electromagnetic magnetic circuit of the magnetic holding electromagnet 200. For a more detailed description, please refer to the content of CN89105949.0 . Said The side yoke 4 is a circular cylindrical magnet. The bottom of the circular cylinder has a smooth outer pole surface 23. The bottom of the circular cylinder is provided with a shaft hole 32. The diameter of the hole is slightly larger than the diameter of the auxiliary magnetic core 2. some. The top of the open part of the garden is provided with an inner stop 61 and a smooth inner face 62 of the stop. The axial height of the stop exceeds the thickness of the lower yoke 5 by about 1 to 2 mm. A bobbin holder 7 is axially installed in the garden, and the electromagnetic coil 6 is a flat-wound reverse excitation coil. The end of the coil bobbin 7 is a through-core magnetically insulating sleeve 21 (of course, it can also be made as a separate part), which is sleeved on the auxiliary magnetic core 2 and passes through the shaft hole 32. The permanent magnets 3 polarized in the thickness direction are installed in parallel between the outer yoke surface 23 of the side yoke and the upper yoke 1. From the above, it can be seen that 7 zirconium iron 3 is not formed due to the existence of the through-core insulating sleeve 21. Magnetic short circuit. The moving iron core 8 is a smooth circular cylinder, and its pole surface and the pole surface of the auxiliary magnetic core 2 constitute the working pole surface 80 of the electromagnet. The moving iron core 8 presents two cylindrical surfaces of different diameters in the axial height, wherein the cylindrical surface near the fixed magnetic core 2 side has the main axial height and a slightly larger diameter; two cylindrical surfaces of different diameters intersect A limiting surface 81 for controlling the working stroke of the moving iron core 8 to not exceed a value of δ is formed everywhere. The lower yoke 5 is a circular-shaped integral orifice plate, and a guide bearing 5 1 is provided at its axial center portion. It has a smooth inner surface and forms a good sliding fit with the moving iron core 8. 02 毫米。 For several tens of micrometers, the overall shape of the circular overall orifice plate, namely the lower yoke 5, is fitted into the stop edge surface 62 of the side yoke 4 by a press fit, and the optimal interference amount is not less than 0.02 mm. At this time, since the annular flange 63 of the inner stop is still about 1 to 2 mm higher than the outer edge surface of the lower yoke 5, for positioning purposes, the annular flange 63 is also provided with a uniform, At more than two inversion riveting points 64. In order to eliminate the inappropriate airbag damping phenomenon caused by the moving iron core 8 reciprocating in the shaft hole of the coil bobbin 7, the present invention provides that the coil bobbin 7 and the moving iron core 8 as well as the coil bobbin 7 and the electromagnetic coil 6 and the closed side magnet The inner wall space of the yoke 4 must have sufficient air gap 33 reserved. A valve stem 10 is rigidly connected to the moving iron core 8. The return spring 9 is sleeved outside the valve stem and the rail bearing 51. The rod 11 is provided with a necessary annular groove, and a return spring positioning flange 35 and a rigid bracket are respectively installed. Plate 12, flexible sheet valve plug 1 1, gasket 1, 3, key pin 14, and metal rod top 34. In order to improve the magnetic permeability and processing technology of the magnetic holding electromagnet, the auxiliary magnetic core 2 and the upper yoke 1 may be a complete magnetic conductor, or may be welded into a whole after being manufactured separately. At the axial center part outside the auxiliary magnetic core 2, there is also a convex cylindrical cylinder body 38, which relies on expansion riveting or screw connection, and the assembled magnetic holding electromagnet 200 and hollow nut are integrated through the cylindrical cylinder 38. 1 5 Connected into one. After the lead wire 19 of the electromagnetic coil 圏 6 passes through the threading hole 37 of the side yoke 4 and the upper yoke 1, the internal space of the hollow nut 15 and the permanent magnet 3 with the upper yoke 1 and the auxiliary core 1 are sealed with a sealing material. The extra space formed between them is completely filled to ensure that the magnetic holding solenoid valve has sufficient air tightness. Finally, in order to prevent impurities such as tar and water droplets in the gas from penetrating into the interior of the electromagnet through the sliding gap formed by the moving iron core 8 and the rail bearing 51, the present invention also provides an outer end portion of the sliding gap. The sealing ring or solid sealing packing 53 embedded in the annular groove on the surface of the guide rail bearing or the moving iron core or sealed in the stuffing box housing. For specific implementation, see node A and FIG. 12.

FIG. 12 shows various embodiments in which a sealing ring or a sealing packing is provided between the magnetic holding solenoid valve moving core and the rail bearing 'sliding surface. Because the gas pressure of the burning appliance is generally low, its value is about 1-5kpa, and the sealing device according to the present invention has lower requirements than the sealing device described in general mechanical engineering. Its main purpose is to prevent the Solid-shaped impurities such as tar, water droplets, and iron salt-based scales penetrate the inside of the electromagnet from the sliding gap, so that the pole faces of the electromagnet cannot fit well. Figure 12 shows the structure of node A in Figure 11: a horizontal annular groove is provided at the end of the guide bearing 51, and a sealing ring 53 made of solid material is even filled with a certain solid lubricating material 54 After the movable iron core 8 is pushed in, the seal 圏 53 is slightly compressed and deformed to seal the sliding fitting gap 52 tightly. In the solution shown in Fig. 12 c) and Fig. 12 e), the annular groove is provided on the surface of the movable iron core 8, and for the convenience of assembly, all the sealing devices in Fig. 12 are provided with an assembly gap 55 for convenient installation. 12b], FIG. 12D], FIG. 12F], and FIG. 1211] show another embodiment of the sealing scheme: a seal ring or a solid sealing filler 5 3 is provided on the top of the guide bearing 51, and it is sealed It is fixed in the stuffing box housing 57. The element 57 may be fixed in the outer convex groove 56 of the guide bearing, as shown in FIG. 12 b). It can also be fastened to the upper yoke 5 with screws 58, as shown in Fig. 12D). It can also be fixed by using the return spring 9 and the positioning flange 59, as shown in FIG. 12F). Of course, the filler 53 can also be squeezed with the conventional fastening thread 60 to seal the sliding fit gap, as shown in FIG. FIG. 13 shows an embodiment of an interlocking joint of a gas control valve of a gas appliance. Among them, a touch button 626 is installed in the inner space of the operation panel 602 above the control valve 617. A hole 628 is provided in the operation panel, and a push rod 627 of the touch button passes through this hole and protrudes. The panel has a free height, and a control valve operation handle 620 is set on the valve stem 629. The control valve operation handle has a circular table top 621. Its outer edge is similar to the traditional structure and is a smooth plane. The inner edge of the circular table top is composed of a plane 623 and a convex arc-shaped bead plane 625 to form a complete 360 ° arc-shaped plane. Among them, the arc-shaped bead plane 622 occupies a center angle ct, and is also provided between two planes of different heights. A smooth transition surface 624. The center angle cc determines its proper radian according to the following principles: Rotate the control valve operation handle 620—until the air passage of the valve body just begins to bleed, and at this time, the curved bead plane 622 just presses the ejector rod 627 to move inward to make the Touching the button 626 switches the action. It can be seen from the above that when the touch button 626 is a pair of movable contact, it has the necessary technical characteristics of the gas control switch LK of the present invention, that is, when the control valve is closed, A pair of moving and opening contacts LK, which are disconnected in the valve opening position; on the other hand, when the touch button 626 is a pair of moving and closing contacts, it has the technical features described in FIG. 8 and FIG. 9 of the present invention and becomes the described Interlock switch LL or LK. Finally, it should be pointed out that, according to FIG. 8 and FIG. 9, the implementation of the safety protection device for a gas appliance according to the present invention may adopt various different implementation schemes. For example, the DC power supply, the flame sensor, the control unit circuit, etc. The electric circuit and the magnetic holding solenoid valve are all installed in the structural space of a gas appliance. For example, a solenoid valve is installed on the intake pipe of the burning appliance, and the test button LAC and the cancel button LAX and the gas control valve interlock switch IX I LL or LK are installed on the operation panel of the burning appliance. Above, all the circuit components and the direct current power supply (dry battery) are installed in a separate closed case inside the burner housing, the housing and the burner are installed and positioned, and a free-opening and closing cover is provided, and it has high temperature resistance Flame retardant properties. The flame ion probe is installed in the burner or in the outer space of the burner to sample the flame. It can be seen that this is a product implementation scheme integrated with the burning appliance.

For example, the magnetic holding solenoid valve can also be installed on a gas source intake branch pipe other than a gas appliance, and the remaining DC power supply, flame sensor, various circuits, buttons and other components are still installed in the structure space of the gas appliance. A separate closed housing inside, the housing and the gas appliance are installed and positioned, and a free-opening and closing cover is provided, which has high temperature resistance and flame retardant characteristics, and an insulated wire is used between the solenoid valve and the closed housing. Linked together. … In short, no matter which embodiment is adopted, they can be made into one or more tangible products according to the technical characteristics specified in the present invention. Since this is a very simple and well-known technology, the present invention is no longer expressed in the drawings.

Industrial applicability

~~ ϊ¾ Compared with the prior art, it has the following advantages: '

1) The circuit structure and production process are simple, and the volume is small and exquisite.

2) Low manufacturing cost.

3) The protection function is reasonable. Manually opening the solenoid valve to achieve magnetic operation without power consumption, fast protection in the event of a flameout, which is faster than the existing national standard (gas rapid heating and heating speed times).

4) The power consumption of a four-burner burner during normal combustion is about 3V / 1. 5 μ Α or 4.5 V / 3 μ Α, which is about 4000 times less than the power consumption of traditional AC inductive flame sensors. .

5) After more than 3,000 on-off operations for more than two years, it proves that the CMOS circuit and the magnetic holding solenoid valve proposed by the present invention work very reliably.

(6) The present invention can be implemented without changing the basic structure of the existing gas appliance complete product. Right demand

1. A method for preparing a flame sensor, which uses one or more traditional flame ion probes to sample the flames of one or more monitored burner fire heads, and is characterized by:

a. Set two DC power sources E and E ₂ connected in series, where the negative pole is connected to the positive pole of E ₂ to form the reference ground point G; h. One or more of the burner fire head 105 is next to the flame At least one side of the nozzle flame of the ion probe has a shell or a shell gasket or a nozzle flame baffle made of a high temperature resistant conductive material and is connected to the G point;

c. A detection circuit 112 is provided for each burner head 105, wherein a resistor R ₂ and an anode of a diode D, are connected to a node 107, a cathode of the latter is connected to a resistor R, and a capacitor The parallel circuit of C, is connected to the node 108, said! ^ And ^ The other end of the parallel circuit is connected to point G, and the components Rz-Di- C, // R, that is, the first branch constituting the detection circuit, a flame ion probe 103 is connected to the node 107 An end of the flame near the nozzle and the casing or the casing pad or the nozzle flame baffle of the burner head 105 has a flame / space air gap 104 of an appropriate width, and the element R ₂ — 103 — 104 -105 constitutes the second branch of the detection circuit;

d. A self-excited electronic oscillator 101 without a transformer continuously outputs a square wave or a sine wave or a triangular wave or Any waveform signal such as a niobium tooth wave, step wave, or sequential pulse wave, as long as its upper swing level 1 is equal to or slightly less than the positive voltage value + V _{DD of the} DC power supply E, and its lower swing amplitude is 0. The level is equal to or slightly higher than the negative voltage value of the DC power supply-V _DD;

c. Setting a level detection circuit 106, the input end of which is connected to the node 108, and selecting and adjusting the capacity of the capacitor (:, and the resistor R, the threshold value of the level detection circuit 106, and the The output waveform and frequency of the electronic oscillator 101, and the resistance value of the resistor R ₂ is greater than 1 ~ 5M Ω, so that the resistance value of the resistor R is larger than the resistance value of R ₂ , that is, at the level The output terminal 109 of the amplitude detection circuit 106 obtains two different logic signals of the monitored flame burning and flame extinction;

f. Set up an electronic switch or voltage comparator 110, whose input terminal is connected to node 107, and by monitoring the potential difference between the signal swing of node 107 and output terminal 102 or the reverse current between the two points 1 ₃ , that is, the flame / air gap 104 may be shorted by a conductor other than the flame on the output terminal of the electronic gate or voltage comparator 110 or on the output terminal 115 of the inverter 114 connected thereto. There are two different logic signals connected and open.

2. The method according to claim 1, characterized in that: the level detection circuit 106 is an electronic switch having a threshold value, and when the electronic switch is an inverter, it can be output at its terminal. 109 Obtain the logic signal of monitored flame burning output as 0 level and flame extinguishing as 1 level.

3. The method according to claim 1, characterized in that: the electronic switch 110 is an inverter or a buckle or the voltage comparator 110 is an operational amplifier and can be obtained on its output terminal 111 When the flame / 'air gap HW is short-circuited by a conductor other than the flame, the logic signal is output at an alternating level of 1/0.

4. The method according to claims 1 to 3, characterized in that: when there are n monitored burner fires 05 05 inches, n independent said sensor detection circuits 112 should be provided and match a common said Level-amplifier circuit 106 ', which has a positive-or gate or positive-or-negative circuit at the input of <1 line. When all burner heads 105 are burnt, the output terminal 109 of the level-amplifier circuit 106' 'You can get a logic signal with output level 0 or 1 on the output terminal: When any one or one of the burner fire head 105 flames in h goes out, the output terminal 109' can be obtained on the output terminal 109 Or () level logic signal & set a common electronic switch or voltage comparator 110 ', which is a positive NOR circuit with n-line input terminal, any one or more of the flame / The air gap 104 is shorted by a conductor other than the flame, and the logic output of 1/0 level ¾ can be obtained on the output terminal 115 of the inverter 114 connected to the voltage comparator 110 ′. ■

16

Replacement page rules Article 26 5. A method for preparing a flame sensor, wherein one or more traditional flame ion probes are used to sample the flames of one or more monitored burner fire heads, which are characterized by:

a. Set two DC power sources E and E ₂ connected in series, where the negative pole is connected to the positive pole of E ₂ to form the reference ground point G; b. One or more of the burner fire head 105 is close to the flame At least one side of the nozzle flame of the ion probe has a shell made of a high-temperature resistant conductive material or a shell gasket nozzle flame baffle and is connected to the G point;

c. A detection circuit 112 is provided for each burner head 105, wherein a resistor R ₂ is connected to the anode of a diode at a node 107, and a capacitor C is connected across the cathode of the diode D, and Between point G, element D, — * :, that is, the first branch of the detection circuit, a flame ion probe 103 is connected to node 107, and an end of the flame near the nozzle is connected to the burner. The casing or casing liner or nozzle flame baffle of the fire head 105 has a flame / space air gap 104 of an appropriate width, and the components R ₂ — 103 — 104 — 105 constitute the second branch of the detection circuit;

(1) A self-excited electronic oscillator 101 without a transformer continuously outputs a square wave or a sine wave to the detection circuit Π2 through its output terminal 102 and the resistor R ₂ connected thereto. Any one of the waveform signals such as triangular wave, sawtooth wave, step wave, or sequence pulse wave, as long as the swing amplitude 1 level is equal to or slightly less than the positive voltage value + V _{DD of the} DC power supply E, and the swing The amplitude 0 level is equal to or slightly higher than the negative voltage value of the DC power source E ₂ -V _DD ;

e. A level detection circuit 106 is provided, the input end of which is connected to the node 108, and the capacity of the capacitor C, the threshold value of the level detection circuit 106, and the electronic oscillator 101 are selected. Output the waveform and frequency, and make the resistance of the resistor R ₂ greater than 1 ~ 5M Ω, so that the resistance of the resistor is larger than the resistance of 11 ₂ , so that the output terminal of the level detection circuit 106 can be On 109, two different logic signals are obtained for the monitored flame burning and flame extinguishing;

f. Set up an electronic switch or voltage comparator 110, whose input terminal is connected to node 107, and by monitoring the potential difference between the signal swing of node 107 and output terminal 102 or the reverse current between the two points 1 ₃ , that is, the flame / air gap 104 may be short-circuited by a conductor other than a flame on the output terminal of the electronic switch or voltage comparator 110 or on the output terminal 115 of the inverter Π4 that is connected thereto. There are two different logic signals for open circuit and open circuit.

6. The method according to claim 5, characterized in that: the level detection circuit 106 is an electronic switch having a threshold value, and the electronic switch can be obtained on its output terminal 109 when the electronic switch is a phase inverter. The logic signal of the flame output being monitored is 0 level and the flame extinguishing is 1 level.

7. The method according to claim 5, characterized in that: when the electronic switch 110 is an inverter or a non-inverter or the voltage comparator 110 is an operational amplifier, it can be obtained at its output. Terminal 111 When the flame / air gap 104 is short-circuited by a conductor other than a flame, a logic signal with an alternating level of 1/0 is output.

8. The method according to claim 5 to 7, characterized in that: when there are 105 burner heads to be monitored, n independent said sensor detection circuits 112 should be set and match a common said level Amplitude-amplifier circuit 106 ′, which has a positive-or gate or positive-or-negative circuit with n-wire input terminals, can be obtained at the output terminal 109 ′ of the level-amplifier circuit 106 ¹ when all burner heads 105 burn normally. The output is a logic signal of 0 level or 1 level; when any one or more of the burner fire head 105 flame is extinguished, the output terminal 109 'can be obtained with an output of 1 level or 0 level. Logic letter _: a common electronic switch or voltage comparator 110 ′ is provided, which is a positive or NOR circuit with an n-line input terminal. When any one or more of the flame / air gap 104 monitored by the flame is outside the flame The short-circuited electrical conductor can obtain a logic signal with an alternating level of 1/0 on the output terminal 115 of the inverter 114 connected to the voltage comparator 110 ′.

A method for preparing a flame sensor, wherein one or more traditional flame ion probes are used to sample the flames of one or more monitored burner fire heads. The characteristics are:

a. Set two series-connected current power sources Ei fll E ₂ , where the negative pole is connected to the Γ pole of E ₂ to form the reference ground point G;

17

Replace page 26 b. One or more of the burner fire heads 105 have a casing or a casing gasket or a nozzle flame baffle made of a high temperature resistant conductive material on at least one side of the nozzle flame of the flame ion probe, and is connected to point G. Phase connection:

c. A detection circuit 112 is provided for each burner head 105, wherein a resistor is connected to the anode of the diode D, at the node 107, and a resistor is connected across the cathode of the diode and the point G The element I ^ —D, —R, that is, constitutes the first branch of the detection circuit. A flame ion probe 103 is connected to the node 107, and an end of the flame near the nozzle is connected to the burner head. The casing or casing gasket or spout flame baffle of 105 has a flame / space air gap 104 of an appropriate width, and the components R ₂ — 103 — 104 — 105 constitute the second branch of the detection circuit;

d. A self-excited electronic oscillator 101 without a transformer, through its output terminal 102 and the resistor R ₂ connected thereto, continuously outputs a square wave or a sine wave or Any waveform signal such as triangular wave, sawtooth wave, step wave, or sequence pulse wave, as long as the swing amplitude 1 level is equal to or slightly less than the positive voltage value + V _{DD of the} DC power supply E, and the swing amplitude 0 level is equal to or slightly higher than the negative voltage value of the DC power source Σ ₂ -V _DD;

e. A level detection circuit 106 is provided, the input end of which is connected to the node 108, and the resistance value of the resistor R, the threshold value of the level detection circuit 106 and the electronic oscillator 101 are selected and adjusted. Output the waveform and frequency, and make the resistance value of the resistor R ₂ greater than 1 ^ M Ω, make the resistance value of the resistor R sufficiently large, so that the output terminal of the level detection circuit 106 can be On 109, two different logic signals are obtained for the monitored flame burning and flame extinguishing;

f. Set up an electronic threshold or voltage comparator 110, the input end of which is connected to node 107, and by monitoring the potential difference between the node 107 and the output signal 102 output signal swing, or the reverse between the two points A current of 1 ₃ can be obtained at the output terminal of the electronic switch or voltage comparator 110 or at the output terminal 115 of the inverter 114 connected thereto. The flame / air gap 104 is shorted by a conductor other than a flame. There are two different logic signals connected and open.

10. The method according to claim 9, characterized in that: the level detection circuit 106 is an electronic switch having a threshold value, and when the electronic switch is an inverter, it can be connected to its output terminal 109 Obtain the logic signal that the monitored flame's combustion output is 0 level and the flame extinguishment is 1 level.

11. The method according to claim 9, characterized in that: when the electronic switch 110 is an inverter or a non-inverter or the voltage comparator 110 is an operational amplifier, it can be obtained at its output terminal 111. When the flame / air gap 104 is short-circuited by a conductor other than the flame, a logic signal with an alternating level of 1/0 is output.

12. The method according to claim 9 to 10, characterized in that: when there are n burner heads 105 to be monitored, n independent said sensor detection circuits 112 should be set and match a common said level Amplitude-amplifier circuit 106 ', which has a positive-or gate or positive-or-negative circuit with n-wire input terminals, and can be obtained at the output terminal 109' of the level-amplifier circuit 106 'when all burner heads 105 are normally burned. The output is a logic signal of 0 level or 1 level; when any one or more of the burner fire head 105 flame is extinguished, an output of 1 level or 0 ¾ level logic can be obtained on the output terminal 109 ′.轵 Signal: A common electronic switch or voltage comparator 110 ′ is provided, which is a positive or NOR circuit with an n-line input terminal. When any one or more of the flame / air gaps 104 monitored by the flame are outside the flame When the conductive body of the short circuit is short-circuited, a logic signal with an output level of 1/0 can be obtained on the output terminal 115 of the inverter 114 connected to the voltage comparator 110 ′.

13. A method for preparing a flame sensor, wherein a traditional flame ion probe 103 samples the flame of a monitored burner fire head 105, and is characterized by:

a. Set a DC power supply E, whose negative pole is the reference ground point G:

b. One of the burner fire heads 105 has a housing or a housing gasket or a nozzle flame baffle made of a high temperature resistant conductive material on at least one side of the nozzle flame of the flame ion probe, and a capacitor C A parallel circuit with a resistor R, is connected to the node 108, and the other end of the parallel circuit is connected to the G point;

18

Substitute 26 c, a flame ion probe 103, the end of the flame near the nozzle with the burner fire head 105 or the casing or the gasket or the nozzle flame baffle has an appropriate width of the flame / air gap 104, element 103- 104 — 105 — d II R, that is, the detection circuit 1 Π ′ constituting the flame sensor, wherein the optimal value of the resistor is not less than 1 ~ 5M Ω;

(1. A self-excited electronic oscillator 101 without a transformer is connected to the flame ion probe 103 through its output terminal 102 and continuously outputs a square wave or a sine wave to the detection circuit 112 'during the entire monitoring process Any triangular waveform, triangular wave, sawtooth wave, step wave or sequence pulse, etc., as long as its swing amplitude 1 level is equal to or slightly less than the positive voltage value + V _{DD of the} DC power supply E, its swing amplitude The 0 level is equal to or slightly positive to the DC power source E, and the negative pole is the level value of the reference ground point G. e. A level detection circuit 106 is provided, the input end of which is connected to the node 108, and the capacitor C is selected, And the size of the resistor R, the threshold value of the level detector circuit, and the output waveform and frequency of the electronic oscillator 101 can be obtained at the output terminal 109 of the level detector 106. Monitoring the flame burning, flame extinguishing, the flame / air gap 104 is shorted by a conductor other than the flame, and there are three different logic signals.

14. The method according to claim 13, characterized in that: the level detection circuit 106 is an electronic switch or voltage comparator having a threshold value, and when the electronic switch is an inverter or an inverting input terminal When the voltage comparator is used, the output of the monitored flame can be obtained on its output terminal 109 as 0 level, the flame extinguished as 1 level, and the flame / air gap 104 is shorted by a conductor other than the flame to 1/0. Three logic signals of alternating levels.

15. A safety protection device for a burning appliance, including a flame sensor, a gas-controlled wide interlock switch for a monitored burner, a delay control circuit, a monostable pulse trigger circuit, a power drive circuit, a solenoid valve, a bistable trigger circuit, and a photoelectric sensor Coupler, electronic switch and DC power supply, which are characterized by:

a, the flame sensor 01 is predetermined according to one of claims 1 to 9 or more of the flame sensor, the electronic oscillator 101 uses two cascaded CMOS inverters IC ,, IC _2, - resistors The inverter R _{s is} connected to the input terminal of the CMOS inverter 1 :, a resistor is connected to the output terminal of the IC, and the input terminal of the IC ₂ , and one end of the capacitor (: is connected to the IC The output end of ₂ is connected to the output terminal 102, and the other ends of the resistor R _s , the resistor R _t , and the capacitor C are connected at the same point, thereby forming a low-power multivibrator with low power consumption: one or more The burner fire head 105 of the shell or the shell gasket or the nozzle flame baffle is connected to the reference point G, and each burner gas control valve is provided with a bipolar interlock switch LK, / LK ₂ , where a one-pole switch LK is opened when the gas control valve is opened and closed when the valve is closed, one end of the gas control valve is connected to the flame ion probe 103 at the node 108, and the other end thereof It is connected to the point G, the other pole of the bipolar switch interlock switch in LK ₂ Said control valve closes off the valve position and time division position when the valve is turned on, the one or more parallel strings Zhen Jian off LK ₂ connected access positive or negative DC power supply main circuit; one or more diodes The cathode of D ₅ is connected to the node 108 of the detection circuit 112 of the flame sensor 01, and the anode is connected to a moving button LAC, and the other end of the LAC is connected to a DC power supply E. The + V _DD phase is connected and constitutes the analog simulation test circuit 08; the level discrimination circuit 106 of the flame sensor is composed of two cascaded CMOS inverter ICs ₄ and 1 <^ to form a phase inverter, 10 = CMOS inverter output terminal 109 is connected to the anode of the diode _03, the cathode of the diode ₀₃ is connected in parallel to a node 109 ', the input of each CMOS inverter IC ₄ with a capacitor and a A parallel circuit of a resistor or only a capacitor C is connected to the node 108, and _Ct and R, the other end of the parallel circuit or the capacitor C, is connected to a point G, a resistor R ₂ is one end of the output terminal of the electronic oscillator 101 102 The other end of the resistor 1 is connected to the anode 107 of a diode D ′, and the cathode of the diode D ′ is connected to the node 108, thereby forming a micro circuit for monitoring the flame burning or extinguishing. The power consumption flame sensor detection circuit Π 2; the anode of the electronic switch or voltage comparator 110 ′ 11: 1 or one or more diodes D ₂ is connected to the node 107 of the flame sensor detection circuit 112, all The cathode of the diode D ₂ is connected in parallel with a series circuit composed of a resistor R ₃ and a resistor R ₄ . A positive OR circuit, the resistor and the connection point of the resistor are connected to the base of the transistor 7, the emitter of the transistor T, and the other end of the resistor R »are connected in parallel with the node 102, and the transistor T , and collector resistors R _s + V _{D D} is connected to the transistor T, the collector output terminal of inverter 111 and a CMOS IC ₃ is connected to the input terminal, the output terminal of the CMOS inverter IC ₁₁₅₃ and a The anode of the independent diode 0 ₃ is connected, and the cathode of the diode D ₃ is connected to the node 109 ′;

b. One end of the resistor R is connected in parallel with the cathode of the diode D ₃ at the node 109 ′, the other end of the resistor R _n is connected in parallel with a capacitor C _u and a resistor R ₁₂ and a low-value resistor R ₁₃ is connected to node a, the other end of resistor R ₁₃ is connected to a CMOS inverter 1 (: ₈ input terminal is connected to node b, and the other end of the parallel circuit of capacitor Cu and resistor R _{12 is} connected to The G point is connected, thereby forming a micro power consumption delay control circuit 02 with a delay of several seconds _; one end of a capacitor C ₁₂ is connected to the output terminal of the 1 (: ₈ at the node C, and the other end thereof The resistor R ₁₄ and the input terminal of a CMOS inverter IC _W are connected to the node d, and the other end of the resistor R ₁₄ is connected to + V _DD , thereby forming a single unit having a pulse width of tens of milliseconds. Stabilizing pulse trigger circuit 03; a resistor R _{15 is} connected to the output terminal of the CMOS inverter IC ₉ and a base of a Darlington tube T „at the node c, the other end of the resistor R _1S and Darlington The emitter of the tube is connected to point G, and the collector of the Darlington tube is connected to the valve closing coil DZF of the solenoid valve. Point f, a freewheeling diode D "and close valve and connected between the coil DZF + V _DD to node f, thereby forming a pulsating operation of the power drive circuit 04 and combined into a basic security appliance control unit Circuit 001:

c The anode of a diode D ₂₁ is an S terminal, which is connected to the output terminal e of the CMOS inverter IC ₉ , the cathode of the diode D ₂₁ is connected to a resistor R _{3 ()} , and the other end is XORed with a CMOS The output terminal of the gate IC _{1 ()} and a resistor R _{1 S} are connected to the node h, and the two input terminals of the CMOS XOR gate IC _lfl are respectively connected to the cathodes of two diodes D ₂₂ , one of which is a diode D ₂₂ the cathode further ₃ 'connected to the cathode of the diode D _2l and a resistor R, a resistor R _3. the other end of the XOR gate CMOS IC _ie output terminals h and a resistor R ₁₈ is connected to the other diode The cathode of D ₂₂ is connected to point G through the resistor R _31. A moving button LAX is connected in parallel with the capacitor C _{M and is} connected across the R terminal of the parallel anode of the two diodes D ₂₂ and + V _DD . Form a bistable trigger circuit 06 started by a positive pulse;

The other end of the resistor R _{1 S} is connected to the base of the resistor R ₁₇ and the transistor T ₁₂ at the node g, and the emitter of the transistor and T, ₂ is connected to the other end of the resistor R ₁₇ at point G. The transistor The collector load of T ₁₂ contains the conventional accident sound and light alarm circuit 010 composed of light-emitting diodes and a siren;

A photocoupler 011 driving light-emitting diode D _1S is connected to the collector of the accident sound and light alarm circuit 010 and the transistor T ₁₂ through the current limiting resistor R ₁₉ at the junction j. When the monitored burner fire head 105 flame is extinguished Or when the flame / air gap 104 is shorted by a conductor other than the flame, the light-controlled thyristor CT of the photocoupler 011 triggers the bidirectional thyristor CT connected in parallel with the contact switch K of the AC power grid to open and automatically starts the discharge. An air fan or range hood constitutes an accident execution circuit 002; d. The solenoid valve is a magnetic holding solenoid valve 05 installed on the gas inlet pipe of the gas appliance, and it is provided with a link that can move axially The connecting rod passes through the valve body and the required airtightness is maintained between the cavity of the solenoid valve and the external space of the wide body by one or more sealing devices, and the operating handle of the solenoid valve and the connection are pressed. The rod moves inward and hits the valve stem to place the solenoid valve in a magnetically-maintained constant position without power consumption. A valve closing coil DZF of the solenoid valve and a magnetically-maintained electromagnet 200 are sealed in the valve body and are not larger than a few. Automatic shut off air accident driving pulse width in milliseconds.

16. The burner safety protection device according to claim 15, characterized in that: when each of the burner gas control valves is in a closed position, a light touch provided inside the burner operation panel The ejector lever of the button extends through the hole to the panel with a free height. When the gas control valve operation handle is rotated, the convex arc-shaped bead presses the ejector rod to smooth the wave surface and the inner edge plane of the bead. The inner side moves to form a bipolar interlock switch LK, / LK _{2 which} works in interlock with the gas control valve. 17. A safety protection device for burning appliances, including a flame sensor, an interlock switch of a monitored burner gas control valve, a delay control circuit, a monostable pulse trigger circuit, a power drive circuit, a solenoid valve, a bistable trigger circuit, and a photoelectric coupling. Device, electronic switch and DC power supply, which are characterized by:

a. The flame sensor 801 is one of the flame sensors according to claims 13 to 14, and the electronic oscillator 101 uses two cascaded CMOS inverter ICs, ICz, a resistor R _s and one The input terminal of the CMOS inverter IC is connected, a resistor R is connected to the output terminal of the 1 <:, and the input terminal of the IC ₂ , and one terminal of a capacitor C is connected to the output of the IC ₂ . The terminal and the output terminal 102 are connected, and the resistor R _s , the resistor R, and the capacitor C are connected at the same point, thereby forming a low-power low-frequency multivibrator 101; a CMOS inverter IC ₄ The level detection circuit 106 of the flame sensor 801, a moving button LAC is connected in series with a resistor R _c and then connected to a parallel circuit of a capacitor and a resistor, and the parallel circuit is connected across the circuit. Between the input terminal of IC ₄ and the G point; one of the casing or casing gasket or nozzle flame baffle of the burner fire head 105 and the parallel circuit and the input of the IC ₄ The terminal phase is connected to the node 108, and one of the flame ion probes 103 One end of the electronic oscillator 101 is connected to the output terminal 102 of the electronic oscillator 101, and the other end of the flame ion probe 103 is connected to the housing or the housing gasket or the nozzle flame baffle of the burner burner 105 A flame / space air gap 104 of an appropriate width _; a DC power source whose negative pole constitutes the reference point G of the safety device for the burner, a single-pole interlock switch LK string provided in conjunction with the burner gas control valve Connected to the positive or negative main circuit of the DC power supply E, the interlock switch LK is disconnected when the gas control wide-close valve position is turned on and is turned on when the valve open position;

b. An anode of a diode D ₃ is connected to an output terminal 109 of the CMOS inverter IC ₄ of the flame sensor 801, and a cathode of the diode D ₃ is connected to an end of a resistor Ru at 109 ′, the other end of the resistor R and a capacitor _U C _u and the parallel circuit of a resistor R ₁₂ and a low value resistor R ₁₃ is connected to the node a, the other end of the resistor R ₁₃ and a CMOS inverter The input terminal of the IC ₈ is connected to the node b, and the other end of the parallel circuit of the capacitor C _u and the resistor R _{12 is} connected to the G point, thereby forming a micro power delay control circuit 802 with a delay of several seconds. ; end of a capacitor C to the inverter ₁₂ 1 <: output terminal ₈ is connected to the node c, which is the other end of a resistor Ru and a CMOS inverter IC ₉ is connected to the input terminal of the node d The other end of the resistor R ₁₄ is connected to + V _DD , thereby forming a monostable pulse trigger circuit 803 with a pulse width of tens of milliseconds; a resistor R ₁₅ and an output terminal of a CMOS inverter IC ₉ and Darlington T _u a base connected to the other end of the node e, and a resistor R ₁₅ Darlington G and the emitter is connected to point T _u, Darlington T "DZF valve closing coil of the solenoid valve and a collector connected to the node F, a freewheeling diode D _n and closing valve The coil DZF is connected in parallel between + V _DD and the node f, thereby forming a pulsating working power driving circuit 804 and combining into a basic gas appliance safety protection control unit circuit 8001;

c. The solenoid valve is a magnetic holding solenoid valve 805 installed on the gas inlet pipe of the gas appliance. It is provided with a link that can move axially. The link passes through the wide body and consists of one or more than one The sealing device maintains the necessary airtightness between the cavity of the electromagnetic gang and the external space of the valve body. Press the operation handle and the connecting rod of the electromagnetic valve to move inward and tap the valve rod to make the solenoid valve inactive. The consumed magnetic remains in the normally open position. A valve closing coil DZF of the solenoid valve and a magnetic holding electromagnet 200 are sealed in the valve body and automatically shut off the air source under the accident pulse drive with a pulse width of no more than tens of milliseconds.

18. The safety protection device for a burning appliance according to claim Π, characterized in that: when each of the burning appliance gas control valves is in a closed position, a light touch provided inside the operating panel of the burning appliance The ejector lever of the button extends through the hole to the panel with a free height. When the gas control valve operating handle is rotated, the convex arc-shaped bead presses the ejector rod through the smooth transition surface and the inner edge plane of the bead. The inner side moves to form a single-pole yoke switch LK that is interlocked with the gas control valve. 19. The solenoid valve used in the safety protection device of a gas appliance is characterized by:

a. The side yoke 4 of the magnetic holding electromagnet 200 sealed in the valve body of the gas control valve is a cylindrical magnet. The bottom of the cylinder is provided with a shaft hole 32. In the cylindrical shape, An inner stop 61 and a smooth stop inner edge surface 62 are provided at the open top end portion of the side yoke;

b. The lower yoke 5 of the magnetic holding electromagnet is a circular hole plate provided with a central shaft hole, and a convex circular ring guide bearing 51 is also provided on the outside of the shaft hole. The interference fit embeds the lower yoke 5 into the inner edge surface of the stop of the side yoke, and the optimal interference amount is not less than 0.02mm _;

c. The annular flange 63 of the inner stop is also provided with two or more uniformly turned inward riveting points 64 _:

d. The outer surface of the moving iron core 8 and the inner surface of the central shaft hole of the guide rail bearing 51 are slidingly fitted with a slight clearance, and an outer end portion of the movable iron core 8 is also embedded in the guide rail bearing or An annular groove on the outer surface of the moving iron core or a sealing ring or a solid sealing filler 53 sealed in a stuffing box housing at the end of the guide bearing _;

e. The moving iron core 8 is also provided with a limit surface for controlling the working stroke of the moving iron core at an end close to the guide rail bearing 51.

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f. Between the moving iron core 8 and the central shaft hole of the magnetic holding electromagnet coil bobbin 7 and between the magnetic holding electromagnet electromagnetic coil 6 and the sealed cylindrical magnetic yoke of the magnetic holding electromagnet A sufficient air gap 33 is reserved in each of the inner wall spaces so as to eliminate the airbag damping phenomenon that may occur when the moving iron core makes axial movement.

g. The upper yoke 1 is a circular yoke with an area equivalent to the projection area of the cylindrical guide magnet, and an auxiliary magnetic core 2 is provided at a central portion thereof. An outwardly convex circular cylinder 38 is provided, and a hollow nut 15 is connected with the circular cylinder 38 as a whole.

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