CN201368578Y

CN201368578Y - Novel variable-frequency induction heating device

Info

Publication number: CN201368578Y
Application number: CNU2009200785567U
Authority: CN
Inventors: 吴剑
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-01-08
Filing date: 2009-01-08
Publication date: 2009-12-23
Anticipated expiration: 2019-01-08

Abstract

The utility model discloses a novel variable-frequency induction heating device comprising a variable-frequency heating system and a waterway circulating pipeline, wherein the variable-frequency heating system comprises a variable-frequency main circuit, a phase-in-shortage circuit, a control circuit, and a driving circuit; and the waterway circulating pipeline comprises a water inlet pipe, a variable-frequency radiator, a heating induction pipe, a spiral heat absorption pipe, a temperature sensor and a water outlet pipe. The water inlet pipe is connected with the variable-frequency radiator; the variable-frequency radiator separates the cold water into branches and feeds to the heating pipe and the spiral heat absorption pipe; the hot water in the spiral heat absorption pipe flows back to the heating pipe; the outlet of the heating pipe is connected with the temperature sensor; and then the water can be delivered out by the water outlet pipe. The novel variable-frequency induction heat device has the advantages of high speed, energy conservation, safety, environmental protection, constant temperature, and practicality.

Description

Novel variable frequency induction heater

Technical field

The utility model relates to civilian field of electric heating, particularly a kind of novel variable frequency induction heater that is used for water heater and shower.

Background technology

At present, homemade water heater mainly contains the natural gas water heater, common water-storage electric heater, solar water heater etc.The natural gas water heater influences environment because of burning the time can produce toxic gas, be subjected to " natural gas " condition restriction and can not large-scale popularization, use gas heater to cause intoxication accident that generation is all arranged normal every year simultaneously.The common electrical water heater is consuming time because of power consumption, can not heat fast, and temperature is mainly undertaken by the principle that hot and cold water mixes, and is difficult to guarantee that water temperature is constant.Solar water heater has " living at the mercy of the elements ", is subjected to weather effect big, the very high restriction of cost and can not widespread usage.Account at present the market mainstream water heater be water-storage electric heater.But also have following problem: 1. water-storage electric heater will pass through long warm before use, uses the water-storage electric heater of a 80L in the winter time, wait more than 2 hour, loses time very much.If preheating one water storing tank hot water too many or too much for use and very waste, if not enough pretty troublesome again, so not only water wasting, but also take electric, use cost is high.3. water storing tank is installed and is taken the valuable interior space.4. traditional water-storage electric heater and instant electric water heater place the static heating of inner bag with water, form incrustation scale easily, and the employed technology trouble of scale removal, and expense is higher, and it safeguards extremely inconvenient.The principle of induction of utilizing of Chu Xianing is carried out the water heater of heating service in the market, inclined to one side slowly, the high utilization that can not have a large capacity and a wide range of cost in addition of, induction speed low because of the high frequency electric frequency.

The utility model content

In order to address the above problem, the utility model has been announced a kind of novel variable frequency induction heater that is used for water heater and shower.Can reach safety and environmental protection, energy-conservation, quick, constant temperature, practical purpose.

For this reason, the utility model adopts following technical scheme: a kind of novel variable frequency induction heater, comprise frequency conversion heating system and water route circulating line, it is characterized in that, the frequency conversion heating system comprises the frequency conversion main circuit, the phase shortage circuit, control circuit, drive circuit, the water route circulating line then comprises water inlet pipe, the frequency conversion radiator, the heat induced pipe, the spiral endothermic tube, temperature sensor, outlet pipe, water inlet pipe is connected with the frequency conversion radiator, the frequency conversion radiator is sent the cold water shunting into heating tube and spiral endothermic tube respectively, hot water flows back to heating tube again in the last spiral endothermic tube, the heating tube outlet is connected with temperature sensor, by outlet pipe hot water is sent at last.

The utility model adopts the soft switch converter technique of electric current and voltage in ripe present international forward position, further improves frequency of oscillation.Utilize the best fit of its frequency and heating tube diameter and pipe thickness, adopt upper frequency 25K-30KHZ to respond to the special heating tube Fast Heating of the higher internal water flowing of principle of its thermal efficiency, induction coil is passed to high frequency electric to water generates high frequency magnetic field in the heating tube, activate hydrone, reach high efficiencies of heat transfer, just water temperature is controlled at setting range about the about 10s of high frequency coil and FEEDBACK CONTROL, and error≤± 2 ℃.Thereby it is low to have solved electric conversion efficiency, hot water temperature's big problem that fluctuates, and cost is low, and heating is rapidly.

Description of drawings

Fig. 1 is the utility model system construction drawing;

Fig. 2 is a frequency conversion heating system system block diagram in the utility model;

Fig. 3 is heat induced tube section figure in the utility model;

Fig. 4 is the utility model schematic diagram.

The specific embodiment

Below in conjunction with the drawings and specific embodiments the utility model is done and to be described in more detail.

Consult Fig. 1, Fig. 2, Fig. 4, a kind of novel variable frequency induction heater comprises frequency conversion heating system 1 and water route circulating line.The frequency conversion heating system comprises frequency conversion main circuit, phase shortage circuit, control circuit, drive circuit.The water route circulating line then comprises water inlet pipe 2, frequency conversion radiator 7, heat induced pipe 5, spiral endothermic tube 6, temperature sensor 4, outlet pipe 3, water inlet pipe is connected with the frequency conversion radiator, the frequency conversion radiator is sent the cold water shunting into heating tube and spiral endothermic tube respectively, hot water flows back to heating tube again in the last spiral endothermic tube, the heating tube outlet is connected with temperature sensor, by outlet pipe hot water is sent at last.

Wherein, during the phase shortage circuit working, three phase mains A, B, the C three-phase passes through R1, R2, enter the bridge rectifier loop after the R3 step-down, work as A, B, the C11 during commutation of C three phase mains, C12, C13 takes out differential signal respectively, after C14 filtering, constitute Ua, make Ua voltage greater than the end of oppisite phase setting voltage by adjusting RP1, then amplifier is output as+15V, work as A, B, the C three phase mains is appointed and is lacked a phase time, the mean value of the differential signal that commutation is taken out reduces by 1/3, thereby is transported into upset, is output as " zero ", with the given signal clamper of control power supply is " 0 " cisco unity malfunction, and indicator lamp is bright simultaneously.

Given circuit is made of R16, RP3, R17, R18, C19, RP2 in the control circuit, and relatively amplifying circuit is made of V26, R21, R22, R23, R28.Given signal is taken out by the RP3 central point by V704 and enters big device in-phase end, and feedback circuit 1 is made of V27, R24, R25, R26, R27, C20 and L3.Temperature feedback signal 2 is made of temperature sensor thermistor R19, R20.

When opening water inlet pipe when work, at first water flow switch will relatively amplify output 200,201 and be switched to the drive circuit input signal.When output water temperature raise, then TEMP R19 began linear decline, and R19 reduces, just total given reducing, comparison amplifier V26 output reduces, thereby the pulsewidth of drive circuit is reduced, then IGBT output high frequency electric reduces, thereby makes water temperature constant in certain value; When inflow increases because of fluctuation, then high-precision sensor resistance R 19 is same becomes big rapidly, makes the UC3879 pulsewidth broaden rapidly, and main circuit IGBT frequency conversion electric current increases, and is setting value up to water temperature.When turn-offing given water, then hydraulic pressure switch disconnects more given signal immediately, quits work immediately.

In the frequency conversion main circuit, be to have added capacitance C21 and pulsactor L5 with common phase shift difference.C21 rises to accelerate to manage after current attenuation makes between circulation and realizes zero-current switching, and utilizes L5 to stop L, C vibration reverse (reverse voltagesecond product deficiency is so that L5 is saturated, so the inductance value of L5 is very big), when the postbrachium pipe led to, L5 was very big, and di/dt rises very slow, voltage descends fast, thereby reaches zero current turning-on.

During work, after V1 opens 1us, make V4 open-minded.As unexpected shutoff V1, this moment, C21 voltage be that a left side is positive right negative, and so L5 is in saturation state L5=0, this moment electric current by A → B → V4 → VD2 → A, V2 opens that to be no-voltage open-minded at this moment.With common PWM phase shift difference.During common phase shift, the L.di/dt=UAB=0 current attenuation is very slow.And voltage, the soft switch of electric current are: UAB=electric capacity two ends negative value, as long as C21 is enough big, electric current just can decay to " 0 " fast, then lags behind to manage V4 and just can be in zero-current switching.Because after loop current decayed to " 0 ", L5 withdrawed from saturated, the L5 inductance is very big, stops the LC vibration to produce reversing the current.When this moment, V3 opened, same L5 was very big, so V3 is in the zero current turning-on state, supply voltage is added in the L5 two ends, makes it saturated, and electric current is by V3 → B → A → V2.So the hysteresis pipe is in zero open and close state.It is open-minded that advance pipe is in no-voltage, advance pipe by and at capacitor C 6, the C7 at pipe two ends, realize its no-voltage off state.

Drive circuit then comprises pulse width modulator UC3879 and drives the amplifying circuit formation.Drive circuit A comprises that V33, V34, V35, V36 and R35, R36, R37, R38, R39 and pulse transformer T1 constitute the forearm driving of soft switching power, and drive circuit B comprises that V37, V38, V39, V40 and R41, R42, R43, R44, R45 and pulse transformer T2 constitute the postbrachium driving of soft switching power.

During work, the given signal 207 after relatively amplifying acts on the input of UC3879, and OUTA, OUTB, OUTC, OUTD four tunnel output relevant pulse width modulation signals are arranged; OUTA, OUTB are the antipodal square-wave signal of two-way phase place.When OUTA and OUTB control drive amplifying circuit, then V33, V34 and V35, V36 take turns conducting, then pulse transformer T1 induce respectively the big electric current of two-way square-wave signal G1, E1, and this two paths of signals of G2, E2. directly drive, the forearm of soft switch is the IGBT pipe up and down.When OUTC, OUTD control drives amplifying circuit B, V37, V38 and V39, V40 take turns conducting, and then pulse transformer T2 induces the pipe of IGBT up and down that the big current square-wave signal G3 of two-way, E3 and this two paths of signals of G4, E4. directly drive the soft switching power postbrachium respectively.Main circuit IGBT like this, V1, V4 pipe and the conducting in turn of V3, V2 pipe, promptly soft switch main circuit is realized frequency conversion.

In addition, consult Fig. 3, heating tube 501 adopts seamless middle low carbon steel pipe, wall thickness 2～2.5mm, and inside and outside chromium plating or nickel are anticorrosion; On the heating tube 501 earlier on the pad mica paper 502 two-layer after, wrap up one deck asbestos insulation cloth 503 backs again and get final product at last high frequency coil around the tool high-insulation.At present, having occurred some heating tubes and be being made by thicker white steel is the stainless steel-like material, but is based on stainless characteristics, and its cost height is difficult to processing, and heat is transmitted slow.And this variable frequency induction heater is the seamless steel pipe of 2～2.5mm owing to adopting pipe thickness, and the common process of inside and outside chromium plating is made, and cost of manufacture is about the part of its white steel.High-frequency line is when coiling in addition, and around the spiral endothermic tube 6 of one group of high-insulation, therefore, cost is low and make coil heating be fully used simultaneously.

At last, adopt current feedback and temperature feedback control principle simultaneously in the utility model, Current Feedback Control is to determine the heating power adjustable range, and temperature sensor then in time feeds back the changing value of heating-up temperature in given circuit, thereby reaches the purpose of intelligent constant-temperature.

During work, cold water divides two-way earlier again by water inlet 2 after water flow switch directly enters 7 heat absorptions of frequency conversion radiator, one the tunnel directly enters heat induced pipe 5, another road enters and enters heat induced pipe 5 again after spiral endothermic tube 6 absorbs heat, utilize opening and turn-offing of control full-bridge IGBT switching device, with the DC current inversion is the alternating current of 25KHz, this alternating current is by the high frequency coil on heat induced pipe 5, make the water generates high frequency magnetic field in the heat induced pipe 5, activate hydrone, utilize heat induced pipe 5 high-frequency induction heating principles, make to reach high rate of heat transfer by water in the heat induced pipe 5 and heat.Simultaneously, by the heat that spiral endothermic tube 6 absorbing coils send, so not only frequency conversion heating system electric conversion efficiency 〉=98%, and the heat of other main heater members also almost obtains 100% utilization, water after the heating is sent by delivery port 3 behind temperature inductor 4 at last.

Claims

1. novel variable frequency induction heater, comprise frequency conversion heating system and water route circulating line, it is characterized in that, the frequency conversion heating system comprises the frequency conversion main circuit, the phase shortage circuit, control circuit, drive circuit, the water route circulating line then comprises water inlet pipe, the frequency conversion radiator, the heat induced pipe, the spiral endothermic tube, temperature sensor, outlet pipe, water inlet pipe is connected with the frequency conversion radiator, the frequency conversion radiator is sent the cold water shunting into heating tube and spiral endothermic tube respectively, hot water flows back to heating tube again in the last spiral endothermic tube, the heating tube outlet is connected with temperature sensor, by outlet pipe hot water is sent at last.

2. according to the described a kind of novel variable frequency induction heater of claim 1, it is characterized in that, soft switch sections has added capacitance C21 and pulsactor L5 in the frequency conversion main circuit, and C21 accelerates current attenuation between circulation makes the back pipe realize zero-current switching, and utilizes L5 to stop L, C vibration oppositely.

3. according to the described a kind of novel variable frequency induction heater of claim 1, it is characterized in that, three phase mains A in the phase shortage circuit, B, the C three-phase passes through R1, R2, enter the bridge rectifier loop after the R3 step-down, work as A, B, the C11 during commutation of C three phase mains, C12, C13 takes out differential signal respectively, after C14 filtering, constitute Ua, make Ua voltage greater than the end of oppisite phase setting voltage by adjusting RP1, then amplifier is output as+15V, work as A, B, the C three phase mains is appointed and is lacked a phase time, the mean value of the differential signal that commutation is taken out reduces by 1/3, thereby be transported into upset, and be output as zero, be zero cisco unity malfunction with the given signal clamper of controlling power supply.

4. according to the described a kind of novel variable frequency induction heater of claim 1, it is characterized in that, given circuit is made of R16, RP3, R17, R18, C19, RP2 in the control circuit, relatively amplifying circuit is made of V26, R21, R22, R23, R28, given signal V704 is taken out by the RP3 central point and enters the amplifier in-phase end, feedback circuit 1 is made of V27, R24, R25, R26, R27, C20 and L3, and temperature feedback signal 2 is made of temperature sensor thermistor R19, R20.

5. according to the described a kind of novel variable frequency induction heater of claim 1, it is characterized in that, drive circuit comprises pulse width modulator UC3879 and drives amplifying circuit, drive circuit A comprises that V33, V34, V35, V36 and R35, R36, R37, R38, R39 and pulse transformer T1 constitute the forearm driving of soft switching power, and drive circuit B comprises that V37, V38, V39, V40 and R41, R42, R43, R44, R45 and pulse transformer T2 constitute the postbrachium driving of soft switching power.

6. according to the described a kind of novel variable frequency induction heater of claim 1, it is characterized in that heating tube adopts seamless middle low carbon steel pipe, inside and outside chromium plating or nickel are anticorrosion, and heating tube is provided with mica paper outward, simultaneously at mica paper outer wrapping one deck asbestos insulation cloth.