CN201106881Y

CN201106881Y - Totally-enclosed type electromagentic furnace

Info

Publication number: CN201106881Y
Application number: CNU2007200583706U
Authority: CN
Inventors: 徐世斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-10-17
Filing date: 2007-10-17
Publication date: 2008-08-27
Anticipated expiration: 2017-10-17

Abstract

The utility model discloses a totally-enclosed type electromagnetic oven, which comprises an oven body (1), a micro-crystal panel (2), a plastic shell (3), a coil plate (4), a power device (5) and a circuit board. The oven body (1) is an enclosed structure, and the electromagnetic oven also comprises a heat storage box (6) of the power device and a coil conducting box (7). The heat storage box (6) of the power device is arranged at the tower part in the oven body. The power device (5) is stuck on the outer wall of the heat storage box (6) of the power device. The coil conducting box (7) is arranged under the micro-crystal panel (2). The coil plate (4) is arranged in the coil conducting box (7) which is filled with conducting material. The oven body of the utility model is an enclosed structure, no foreign matter comes into oven body, thereby guaranteeing the clean of the inside of the oven body; moreover, circuits in the oven body can not have the accident of short-circuit fire waste caused by foreign matter. The totally-enclosed type electromagnetic oven of the utility model also improves the heat efficiency without noises of fan and wind.

Description

Totally enclosed type induction cooker

Technical field

The utility model relates to a kind of electromagnetic oven, and particularly a kind of body of heater is fully closed electromagnetic oven.

Background technology

The structure of existing electromagnetic oven as shown in Figure 1, electromagnetic oven is to adopt the magnetic field induction vortex principle, it utilizes the electric current of high frequency to pass through loop coil, thereby produce the countless sealing magnetic lines of force, when the magnetic line of force in the magnetic field passes through the bottom of magnetic conduction pot body (as: irony pot), promptly can produce countless little eddy current (a kind of alternating current, what the family expenses electromagnetic oven used is the high frequency electric of 15-30KHz), make pot body heating at a high speed voluntarily itself, and then food in the heating kettle.So electromagnetic oven has following characteristics: safe, energy-conservation, health, the flames of anger, smokeless, dustless, no residue waste gas.

But existing electromagnetic oven also has the place of following deficiency:

One, is provided with radiator fan and have inlet and outlet.Existing electromagnetic oven all has radiator fan, correspondingly has air inlet and air outlet.Radiator fan dispels the heat to the parts in the stove, and itself is driving member, can damage, and it is in case damage, and temperature will soon make very fast rising the too high and shutdown of stove self-temperature or burns out in the stove.Because electromagnetic oven mainly uses in the kitchen, the air inlet of electromagnetic oven and air outlet enter electromagnetic oven for mosquito, fly, cockroach etc. and have settled down convenience is provided, and in a single day cockroach enters the high-pressure area of electromagnetic oven wiring board, very easily causes the short circuit of electric line, burns out electric line and electronic devices and components thereof.Simultaneously, the aqueous vapor in kitchen, oil smoke etc. also can be adsorbed on circuit board and the electronic devices and components by in the radiator fan inhalation machine of electromagnetic oven, and the performance of the dielectric strength of circuit board and electronic devices and components and machine performance and life-span are caused great influence.

Two, the thermal efficiency can't promote.The thermal efficiency generally can only reach 84-86%, and the thermal efficiency limit can only reach 90%, can't further promote again.Its loss is mainly aspect four: 1, power device loss (as: IGBT power tube, rectifier bridge, filter inductance etc.); 2, electric current flows through coil panel, power line and the copper loss that produces; 3, the iron loss of electromagnetic oven panel, because it is its vertical (up and down) to conduct heat fabulous that the material of crystallite (pottery) panel of electromagnetic oven has very big characteristics, and the bottom of pan directly contacts with the panel of electromagnetic oven, like this, the a part of heat of pan transmits downwards by the panel of electromagnetic oven, forms useless iron loss; 4, radiator fan and other electronic devices and components generate heat and the loss of generation.More than four aspect heats that loss forms, outwards dispelled away by radiator fan, so just limited the lifting of the thermal efficiency.

Three, can not the continuous low power heating.Now its minimum heating power continuously of electromagnetic oven on the market (is example with 2000W) also has 800W.If will reduce its power again, just adopt to be interrupted to heat and (promptly heat several seconds, stop to heat several seconds), though realized reducing of general power like this, had a strong impact on its result of use, when heating, boiling rapidly in the pot, when stopping to heat, the outwards heat radiation again that just stops in the pot seething with excitement simultaneously can not be kept continuous fluidized state in the pot at once.Simultaneously, when water (is for example cooked, when insulation) to a certain degree the time less automatically, at the utmost point of heat hot in the short time, just probably the food in (the bottom of a pan) in the pot is burnt.

Summary of the invention

The purpose of this utility model provides a kind of Totally enclosed type induction cooker that does not have radiator fan and inlet and outlet.

For achieving the above object, the technical solution of the utility model is: a kind of Totally enclosed type induction cooker, comprise body of heater, crystallite panel, plastics face-piece, coil panel, power device and circuit board, described body of heater is an enclosed construction, described electromagnetic oven also comprises power device heat storage tank and coil heat conduction case, described power device heat storage tank is arranged on the bottom in the body of heater, described power device is attached on the power device heat storage tank outer wall, described coil heat conduction case is arranged on crystallite panel below, described coil panel is contained in the coil heat conduction case, is filled with Heat Conduction Material in the described coil heat conduction case.

As a kind of improvement of the present utility model, the bottom of described coil heat conduction case is the shape that caves inward.

As further improvement of the utility model, described circuit board comprises high-frequency oscillating circuits and transfiguration circuit, described high-frequency oscillating circuits is made up of inductance L 2, capacitor C 4 and power device IGBT, and described transfiguration circuit is made up of electric capacity (C4, C5, C6), relay (KZ1, KZ2), diode (D3, D4), triode (Q1, Q2), resistance (R9, R10) and chip (IC1).

The beneficial effects of the utility model are: since with coil panel produce the copper loss heat collect after the crystallite panel returns again to pan by coil heat conduction case, thereby further promoted the thermal efficiency.And body of heater is enclosed, do not have radiator fan and inlet and outlet, therefore not having cockroach, mosquito etc. enters body of heater inside, does not also have oil smoke and enters body of heater inside, guaranteed the cleaning of body of heater inside, made that the circuit of body of heater inside can be owing to foreign matter causes the short circuit scaling loss.Simultaneously, increased transfiguration frequency modulation, made the utility model can realize the continuous low power heating at circuit part.The utility model has been cancelled radiator fan, has not had the noise of fan and wind.

Description of drawings

Fig. 1 is the structure chart of existing electromagnetic oven;

Fig. 2 is a structure chart of the present utility model;

Fig. 3 is a circuit block diagram of the present utility model;

Fig. 4 is circuit theory diagrams of the present utility model.

The specific embodiment

As shown in Figure 2, Totally enclosed type induction cooker of the present utility model, its assembly comprises: body of heater 1, crystallite panel 2, plastics face-piece 3, coil panel 4, power device 5, power device heat storage tank 6, coil heat conduction case 7 and circuit board.Also have main control board, control panel (display board), power line etc. in addition.Power device heat storage tank 6 is arranged on the bottom in the body of heater 1, and power device 5 is attached on the power device heat storage tank outer wall, and coil heat conduction case 7 is arranged on crystallite panel 2 belows, and coil panel 4 is contained in the coil heat conduction case, also is filled with Heat Conduction Material in the coil heat conduction case 7.

Coil panel 4 is wrapped on the coil bracket by copper cash and forms, and coil bracket adopts high-temperature insulation material (refractory ceramics, glass, high temperature plastics).Guaranteeing has certain clearance between circle and circle, to avoid short circuit between coil.

Coil heat conduction case 7 adopts thick metal material, therefore has electromagnetic shielding action and high temperature resistant characteristics, also has certain toughness and elasticity.The shape that its bottom design is become to cave inward, when the built-in electrical insulation Heat Conduction Material is heated the back expansion, under pressure, the bottom of depression can be to lower convexity, thereby in decompression, strengthened volume inside again, thereby guaranteed can not burst coil heat conduction case 7 when its built-in electrical insulation Heat Conduction Material is heated the back expansion.Coil panel 4 is packed in the coil heat conduction case 7, and fixing.Insulation, Heat Conduction Material (conduction oil) are filled in coil heat conduction case 7 inside.Simultaneously.Inner lead will be with insulating materials with insulation of itself and coil heat conduction case and sealing.Then coil heat conduction case 7 usefulness high-temperature insulations are adhesive on crystallite (pottery) panel, and fixing.

Because coil panel 4 is coupled together by Heat Conduction Material (conduction oil) with crystallite (pottery) panel 2, simultaneously, utilize fabulous these characteristics of crystallite (pottery) panel 2 vertical (up and down) heat transfer, the heat that the copper loss of coil panel 4 produces is passed to pan by crystallite (pottery) panel 2, thereby further promoted the thermal efficiency of complete machine.

6 of power device hot water storage tanks are to utilize maximum these characteristics of water specific heat capacity, and the heat transferred water that the loss of power device 5 is produced in the heat that the loss of water absorbed power device 5 produces, is constantly discharging this heat to the space again.When electromagnetic oven when not using; Also the unnecessary heat that water absorbs slowly can be discharged to the space.Power device (IGBT (power tube), rectifier bridge etc.) 5 hot water storage tank 6 outer walls by aluminum are conducted its heat to its inner water, this moment, hot water storage tank 6 outer walls of its aluminum promptly were radiators, heat when dispel the heat in the external world, is saved heat to its inner water again.By design, the area of hot water storage tank 6 and the area that contacts with water are tried one's best greatly, even so just can guarantee that water need not flow, also can make its heat pass to inner water uniformly, can dispel the heat to the external world to greatest extent again simultaneously.Example: the electromagnetic oven of a 2000W, with bottom 230mm * 230mm * 23mm height, the water of its inner dress 20mm (about 1KG) is in hot water storage tank, continuous operation is 12 hours under the room temperature of 32 degree, its temperature is no more than 65 degree, and the safe working temperature of IGBT (power tube), rectifier bridge then can reach 115 degree.The water of power device hot water storage tank 6 inside can only be adorned below 90% of total capacity, the expansion space that other space can increase as volume behind the water freezing at low temperatures.The material of power device hot water storage tank 6 can use aluminum or aluminum alloy and other metal material to make, and promptly conducts heat can timely heat be passed to water soon and to space heat elimination; Have specific hot strength, yield strength, ductility and corresponding work hardening rate again and arranging the variation that allows deflection, so after freezing, also be not easy to break.

Circuit block diagram as shown in Figure 3, circuit part of the present utility model, only have at the available circuit plate on the basis of power supply input, filter circuit part 11, rectifying and wave-filtering part 12, electrical network sampling part 13, auxiliary (pair) power unit 14 and control circuit part 15, increased the higher-order of oscillation (frequency conversion) part 16 and transfiguration circuit part 17.

Transfiguration frequency conversion part of the present utility model adopts " C " that change " LC " resonant tank to realize the wide region adjusting of frequency and power.As shown in Figure 4: C4 and C5 (by electromagnetic relay KZ1), C6 (by electromagnetic relay KZ2) are connected in parallel.Simultaneously, C5 and electromagnetic relay KZ1 are connected in series; C6 and electromagnetic relay KZ2 are connected in series.Relay K Z1, KZ2 place normally off.When normality or when starting shooting high-power state, triode Q1, Q2 all end, and the equal place in circuit of resonant capacitance C5, C6 is connected in parallel with C4 simultaneously.Its total capacitance C is total=C4+C5+C6=0.07+0.07+0.13=0.27uF.When power reduction to a certain value (example: in the time of 1600W), IC1 is pin output high level 9., is added to the Q1 base stage by R9, the Q1 conducting, it is elementary that electric current flows through electromagnetic relay KZ1, KZ1, C5 disconnect, C is total=C4+C6=0.07+0.13=0.2uF.When power continue to reduce and be reduced to a certain value (example: in the time of 1200W), IC1  pin output high level is added to the Q2 base stage by R10, the Q2 conducting, it is elementary that electric current flows through electromagnetic relay KZ2, KZ2, C6 disconnect; Simultaneously, IC1 is the pin output low level 9., and Q1 ends, KZ1 closure, C5 place in circuit.C is total=C4+C5=0.07+0.07=0.14uF: when power continue again to be reduced to a certain value (example: in the time of 700W), IC1 is 9., the  pin all exports high level, the equal conducting of Q1, Q2, KZ1, KZ2, C5, C6 disconnect.C is total=C4=0.07uF.Simultaneously, also can continue to add or reduce the progression of transfiguration frequency conversion, realize the purpose of transfiguration frequency modulation Power Regulation.

Claims

1. Totally enclosed type induction cooker, comprise body of heater (1), crystallite panel (2), plastics face-piece (3), coil panel (4), power device (5) and circuit board, it is characterized in that: described body of heater (1) is an enclosed construction, described electromagnetic oven also comprises power device heat storage tank (6) and coil heat conduction case (7), described power device heat storage tank (6) is arranged on the bottom in the body of heater, described power device (5) is attached on power device heat storage tank (6) outer wall, described coil heat conduction case (7) is arranged on crystallite panel (2) below, described coil panel (4) is contained in the coil heat conduction case (7), is filled with Heat Conduction Material in the described coil heat conduction case (7).

2. Totally enclosed type induction cooker according to claim 1 is characterized in that: the bottom of described coil heat conduction case (7) is the shape that caves inward.

3. Totally enclosed type induction cooker according to claim 1 is characterized in that: described circuit board comprises high-frequency oscillating circuits (16) and transfiguration circuit (17).

4. Totally enclosed type induction cooker according to claim 3, it is characterized in that: described high-frequency oscillating circuits is made up of inductance (L2), electric capacity (C4) and power device (IGBT), and described transfiguration circuit is made up of electric capacity (C4, C5, C6), relay (KZ1, KZ2), diode (D3, D4), triode (Q1, Q2), resistance (R9, R10) and chip (IC1).