CN2224368Y

CN2224368Y - Electromagnetic water-heating device

Info

Publication number: CN2224368Y
Application number: CN 94244267
Authority: CN
Inventors: 贺贵腾
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-11-04
Filing date: 1994-11-04
Publication date: 1996-04-10
Anticipated expiration: 2004-11-04

Abstract

The utility model relates to an electromagnetic water heater heated by the high frequency magnetic field induction. The utility model is composed of a control circuit, a main heating circuit, a main heating water tank, a preheating circuit, a preheating water tank, a protection circuit, and a low pressure power supply. The PWM pulse generated by the control circuit respectively acts on the drive circuits of the main heating circuit and the preheating circuit, which causes the high frequency current to be generated by a heating coil curl, the alternation strong magnetic field to be generated at the periphery of the heating coil curl, and the strong vortex current can be induced by the heating sheet of the heating water tank to heat. The cold water flowing through the surface of the heating sheet is heated. Because the circuit systems and the heating elements are isolated and the heating elements has no electricity, the utility model has the advantages of high safety, high thermal power, electricity saving, simple structure, and low cost.

Description

Electromagnet water heater

The utility model relates to the electromagnet water heater of a kind of electromagnetic field of high frequency eddy-current heating, specifically be exactly to produce high frequency magnetic field by the heater coil in the Circuits System, and on the heating plate of water tank, induce strong eddy current and generate heat, will flow through a kind of electromagnet water heater of its surperficial water heating.

Present water heater has two big classes, and a class is a gas heater, and another kind of is the electrothermal heater.Gas heater is owing to use flammable explosive gas such as coal gas or liquefied gas, so environment for use and conditional request harshness, water heater quality requirement height if improper use or water heater quality have problem, can cause personal injury and property loss.And the electrothermal heater is owing to be to adopt electrothermal tube that heating wire is made into as heater element, and the thermal efficiency is low, and the life-span is short, and electrothermal tube contacts with water for a long time, easily produces incrustation scale, and causes hazards such as electric leakage

The purpose of this utility model be to provide a kind of safe, reliable, cost is low, volume is little, is suitable for the electromagnet water heater that family etc. uses.

The utility model is to realize like this; whole electromagnet water heater by control circuit, main heater circuit, main heating water tank, preheat circuit, preheat water tank, low-tension supply, holding circuit formed; control circuit and main heater circuit and preheat circuit and link; main heater circuit and the heater coil that preheats circuit are fixed on the safety glass central authorities on corresponding heating water tank surface, and parallel with the heating plate in the heating water tank.The pwm pulse signal that is produced by the pwm circuit in the control circuit is divided into two-way, one the tunnel adds to the drive circuit of main heater circuit, another road adds to the drive circuit that preheats circuit, two on-off circuits that make main heater circuit respectively and preheat circuit through the pwm pulse behind these two drive circuits carry out conducting by the frequency of pwm pulse and dutycycle and end, make by

Two about 300V DC voltages that voltage process rectifying and wave-filtering obtains act on main heater coil respectively and preheat on the coil by the conducting rule of on-off circuit, in two heater coils, flow through a frequency and dutycycle and the identical high frequency electric of pwm pulse, around them, produce high frequency magnetic field, and on corresponding heating plate, induce very strong eddy current, emit a large amount of heat energy simultaneously, the cold water that flows into from the water inlet that preheats water tank flows through the surface that preheats sheet earlier, preheated, and then enter main heating water tank, after adding to needed temperature, flow out again, so just finished the overall process that electromagnet water heater adds hot water.

The utility model is the high frequency magnetic field induction that produces by Circuits System, make on the heating plate and to produce eddy current and generate heat, so Circuits System and heater element are isolated, heater element is not charged, and security performance is good, and heater element is under water fully, the thermal conversion efficiency height, power saving, simple in structure, cost is low.

Fig. 1 is a functional-block diagram of the present utility model.

Fig. 2 is control circuit figure of the present utility model.

Fig. 3 is main heater circuit of the present utility model and preheats circuit diagram.

Fig. 4 is holding circuit figure of the present utility model.

Fig. 5 is a heating water tank structural representation of the present utility model.

Be further described below below in conjunction with accompanying drawing:

As shown in Figure 1; the utility model comprises control circuit D, holding circuit E, low-tension supply C, main heater circuit A, preheats circuit B, main heating water tank H, preheats water tank F; control circuit is respectively with main heater circuit with preheat circuit and connects, main heater circuit and preheat circuit and act on corresponding main heating water tank respectively and preheat water tank.The pulse signal that is produced by the pwm circuit D1 in the control circuit is divided into two-way, add to the drive circuit and the drive circuit that preheats circuit of main heater circuit respectively, two on-off circuits that make these two drive circuits carry out conducting by the frequency of pwm pulse and dutycycle and end, by Two about 300V DC voltages that the filtering of voltage process obtains act on main heater coil L13 respectively and preheat coil L22 by the conducting rule of on-off circuit, flow through a frequency and dutycycle and the identical high frequency electric of pwm pulse at these two heater coils, around them, produce high frequency magnetic field, make on the heating plate in the heating water tank and induce very strong eddy current, emit a large amount of heat energy simultaneously, the cold water that flows into from the water inlet that preheats water tank flows through the surface of heating plate earlier, the preheated laggard heating water tank of becoming owner of, add to after the required temperature and flow out again, so just finished the process that electromagnet water heater adds hot water.

As shown in Figure 2, control circuit of the present utility model comprises pwm circuit D1, the control of synchronous circuit D2 power and indicating circuit D3 and warning circuit D4.Pwm circuit D1 is made up of R30～R38, C30, C31, VD30, VD31, V30, V31, N30 (A), N30 (B); Synchronous circuit D2 is made up of R40～R54, C40～C43, VD40～VD43, V40～V43 and N30 (C); Power control and indicating circuit D3 are made up of R60～R69, RP60, C60～C63, VD60～VD64, V60 and N60; Warning circuit D4 is made up of R55～R59, C51, N30 (D) and B50.The pulse signal that is produced by pwm circuit D1 passes through the paraphase of V31 and the level translation of V30, obtains an amplitude and be about 6V on R19 ^P-PPulse signal, be divided into two-way then and add to main heater circuit and preheat the drive circuit of circuit.Produce pwm pulse signal with heater circuit V10 colelctor electrode negative peak impulsive synchronization in order to ensure pwm circuit D1, import the voltage parameter at main heater coil L13 two ends respectively at the input of comparator N30 (C), " C " end of L13 is

About 300V DC voltage that voltage obtains through rectifying and wave-filtering, " b " end of L13 is the collector voltage of V10, finishes the synchronous tracking of pulse signals.Power control is by regulator potentiometer RP60, makes the base stage of V60 and the voltage respective change of emitter stage, thereby changes the dutycycle of the pwm pulse of N30 (B) output, reaches the power output of control water heater.The voltage signal of responding on L12 and the power output of main heater coil are in direct ratio, after the process rectifying and wave-filtering becomes DC voltage, from the input of " f " end, after R64 and R65 dividing potential drop, add to the input of N60, carry out the power indication.

As shown in Figure 3, main heater circuit and preheat circuit by drive circuit, on-off circuit, heater coil, current rectifying and wave filtering circuit is formed.The drive circuit of forming main heater circuit by R10～R19, C14, V11～V14 and VD15; The on-off circuit of forming main heater circuit by C12, C13 and V10; L13 is main heater coil; The current rectifying and wave filtering circuit of forming the 300V dc source of main heater circuit by L11, C11 and VD10～VD13; L12 is the electric current mutual inductor.Pwm pulse signal is from " a " end input, adds to the base stage of V13 through current-limiting resistance R12, and V13 becomes 2 road opposite each other pwm pulse signals of polarity with the pwm pulse signal of input.When the pulse signal from the input of " a " end was high level, the anti-phase low level that is output as of V13 colelctor electrode made the V11 saturation conduction; The homophase output of V13 emitter stage makes the V14 saturation conduction, V12 ends, + 8V power supply injects the conducting electric current by R10 to the V10 base stage, make the V12 saturation conduction, the 300V DC voltage that is obtained by rectifying and wave-filtering by 220V voltage directly adds on the main heater coil L13, forms a linear big electric current that increases in L13.When the pulse signal from the input of " a " end was low level, the anti-phase high level that is output as of V13 colelctor electrode ended V11; The homophase output of V13 emitter stage ends V14, + 8V power supply injects the conducting electric current by R15 and R18 to the base stage of V12, make the V12 saturation conduction, the base stage of V10 is clamped at rapidly-6V and ending, current path in main heater coil L13 is cut off, the colelctor electrode of V10 produces a negative peak pulse simultaneously, so just in main heater coil L13, produce the alternating current that frequency is identical with pwm pulse signal with dutycycle, and produce an alternating magnetic fields around it, on the heating plate of main heating water tank, induce eddy current, simultaneously heating.The size of main heater circuit power output is the saturation conduction time by switching tube V10, also is the dutycycle of pwm pulse, and the inductance value and the structure of main heater wire determine.It is just the same to preheat the circuit form of circuit and operation principle and main heater circuit.

Shown in 4, the holding circuit of electromagnet water heater is by overvoltage crowbar (R79, R83, R85, RP72, VD75, VD76 and N70 (B)), under-voltage protecting circuit (R80～R82, R84, VD74, VD73T N70 (A)), current foldback circuit (R70～R71, RP70, C70, VD70, VD71, N70 (D)) and overtemperature protection and hydraulic pressure testing circuit (R75, R77, R78, R85, VD72, N70 (E) and S70) form.The effect of overvoltage circuit is to prevent because the too high or other reasons of line voltage causes that switching tube colelctor electrode inverse peak voltage is too high, and causes the damage of switching tube.The colelctor electrode that the end of oppisite phase of comparator N70 (B) is connected to V10 by R85 and R83 divider resistance is used to monitor the amplitude of negative peak pulse.Work as grid voltage change, cause inverse peak voltage to raise, at the level adjustment potentiometer RP72 of N70 (B) in-phase end setting; make N70 (B) output low level, make power control level be clamped on low level by VD75, pwm circuit is not worked; heater circuit is not worked yet, and plays the overvoltage protection effect.The operation principle of under-voltage protecting circuit, current foldback circuit, overtemperature protection and hydraulic pressure testing circuit is identical with overvoltage crowbar with circuit form.

As shown in Figure 5, main heating water tank of the present utility model is the same with the structure that preheats water tank, and in Fig. 5,1 is water inlet; 2 is delivery port; 3 is heating plate; 4 safety glass; 5 is tank shell; 6 is heater coil; 7 is the flat magnetic stripe of high frequency; 8 is the plug that heater coil and circuit link.Be embedded with a heating plate in the centre of water tank, heating plate is with the water tank separated into two parts, heating plate adopts the steel plate of thickness 0.8MM, have row's aperture in its underpart, two parts of heating water tank are communicated with, the one side of heating water tank adopts dielectric strength higher, the reinforcement safety glass material of high temperature resistant impact, heater coil is fixed on the centre of safety glass, the high frequency magnetic field that heater coil produces induces strong eddy current and generates heat on heating plate, become the thermal source of electromagnet water heater, cold water flows into from the water inlet on top, and the surface of flowing through heating plate enters another part of water tank then to the bottom from the aperture of heating plate bottom, another side from heating plate flows through again, and last heated water flows out from delivery port.

Claims

1, the electromagnet water heater of a kind of electromagnetic field of high frequency eddy-current heating; it comprises control circuit, holding circuit, low-tension supply, main heater circuit, preheats circuit, main heating water tank, preheats water tank; it is characterized in that control circuit directly connects main heater circuit and preheats circuit; main heater circuit and the heater coil that preheats circuit are fixed on the acierage glass central authorities of heating water tank; and it is parallel with the heating plate in the heating water tank; by the alternating intense magnetic field that produces around the heater coil; make the middle heating plate of heating water tank induce eddy current, emit heat energy.

2, electromagnet water heater according to claim 1, it is characterized in that control circuit is made up of pwm circuit D1, synchronous circuit D2, power control circuit D3 and warning circuit D4, the pulse signal that pwm circuit D1 produces divides two-way to add to main heater circuit and the drive circuit that preheats circuit through the paraphase of V31 and the level exchange of V30.

3, electromagnet water heater according to claim 1, it is characterized in that main heater circuit and preheat circuit forming by drive circuit, on-off circuit, heater coil, current rectifying and wave filtering circuit, hold the pwm pulse of input through overdrive circuit by " a ", make on-off circuit carry out conducting and end by the frequency of pulse and dutycycle, the DC voltage that obtains through current rectifying and wave filtering circuit by the conducting of on-off circuit and by law effect in heater coil.

4, electromagnet water heater according to claim 1; it is characterized in that holding circuit is made up of overvoltage crowbar, under-voltage protecting circuit, current foldback circuit, overheating protection circuit; in overvoltage crowbar; the end of oppisite phase of comparator N70 (B) is connected to the colelctor electrode of V10 by R85 and R83 divider resistance, at N70 (IB) in-phase end level adjustment potentiometer RP72 is set.

5, electromagnet water heater according to claim 1, it is characterized in that main heating water tank and preheat water tank forming by heating plate, safety glass, tank shell heater coil, in a side of water tank is safety glass, heater coil is fixed on the centre of safety glass, be embedded with a heating plate in the centre of water tank, the bottom of heating plate has row's aperture.