CN201163051Y

CN201163051Y - Non-fan totally-enclosed electromagnetic stove

Info

Publication number: CN201163051Y
Application number: CNU2008200425016U
Authority: CN
Inventors: 徐世斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-01-04
Filing date: 2008-01-04
Publication date: 2008-12-10
Anticipated expiration: 2018-01-04

Abstract

The utility model provides a fanless fully enclosed electromagnetic oven, comprising an oven body, a minicrystal panel, a coil panel, a power device, a circuit board, a heat accumulating box of the power device, and a shielding bracket of the coil panel, wherein, the oven body has a fully enclosed structure, the minicrystal panel is connected with the stove body through a face piece, the heat accumulating box of the power device is arranged on the lower part of the oven body, the power device is closely clung to the external wall of the heat accumulating box of the power device or is embedded at the bottom of the heat accumulating box, the coil panel is closely clung to the lower part of the minicrystal panel as possible, and the shielding bracket of the coil panel is arranged on the lower part of the coil panel. Because the coil panel technology is improved, the coil panel is closely contacted with the minicrystal panel directly, and the generated copper loss high temperature is returned to the pot again by the minicrsytal panel, thereby improving the thermal efficiency; moreover, the oven body has the enclosed structure and no foreign matter enters the inner part of the oven body, thereby avoiding the phenonmenon that an inner circuit of the oven body is burnt down by short circuit due to the entrance of the foreign matter; and a heat dissipating fan is not arranged and no noise is generated.

Description

No fan Totally enclosed type induction cooker

Technical field

The utility model relates to a kind of stove and accessory that utilizes the electromagnetic inductive heating principle heating, and particularly a kind of body of heater is the fully closed electromagnetic oven of no fan.

Background technology

The structure of existing electromagnetic oven as shown in Figure 1, include body of heater 1, crystallite panel 2, plastics face-piece 3, coil panel 4 and radiator fan 5, crystallite panel 2 joins by plastics face-piece 3 and body of heater 1, coil panel 4 places the below of crystallite panel 2, body of heater 1 bottom establishes radiator fan 5 so that heat radiation is equipped with soft magnetic bodies 6 (see figure 2)s below the coil panel 4.Utilize the magnetic field induction vortex principle, make the electric current of high frequency 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, 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 still there is following technological deficiency in existing electromagnetic oven:

One, fragile.Existing electromagnetic oven all is provided with radiator fan and has into and out of the air port, and radiator fan will dispel the heat to the parts in the stove, and itself is driving member, fragile, and it is in case damage, and temperature causes very fast rising the too high and shutdown of the Yin Wendu of stove own or burns out in the stove; And the humidity in kitchen is very big, and its aqueous vapor, 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 very big influence.In addition, 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 it enter the high-pressure area of electromagnetic oven wiring board, very easily cause the short circuit of electric line, burn out electric line and electronic devices and components thereof.

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 that its vertical heat transfer is 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 formed heats of aspect loss, outwards dispelled away by radiator fan, cause thermal loss and waste, 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 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 heating in the short time, just probably the food in (the bottom of a pan) in the pot is burnt.

Summary of the invention

In order to overcome the technical deficiency of existing electromagnetic oven, the utility model proposes a kind of rational in infrastructurely, there is not the no fan Totally enclosed type induction cooker of radiator fan and inlet and outlet.

For achieving the above object, the utility model is achieved by the following technical programs: the complete machine of no fan Totally enclosed type induction cooker is taked full-closed structure, its main body comprises body of heater, the crystallite panel, face-piece, the coil panel of special process, power device and circuit board, described electromagnetic oven also comprises power device heat storage tank and coil panel shield bracket, the crystallite panel is connected with body of heater by face-piece, the power device heat storage tank is located at the interior bottom of body of heater, power device is close on the power device heat storage tank outer wall or is embedded in the bottom, described coil panel is close to crystallite panel below, directly closely contact with the crystallite panel, dispel the heat to coil panel by the pan that is placed on the boiler face, can also be supported and fixed on by the coil panel shield bracket of dividing on the upper surface of power device heat storage tank or the body of heater drain pan or on the body of heater face-piece.

In the utility model, also can be without the coil panel shield bracket, and by the silica type material with coil panel directly and the crystallite panel bond together, perhaps coil panel is fixed on the upper surface of power device heat storage tank; Also can be without face-piece, and directly crystallite panel and body of heater are bonded together by the silica type material.

Further measure is: the upper and lower surface of described coil panel all is equiped with soft magnetic bodies, and the soft magnetic bodies of installing above is embedded in the groove at coil panel middle part; Power device heat storage tank in the described body of heater is equipped with the hot water storage tank of water in being, utilizes water-cooled not need the water cycle cooling system with heat absorption, heat radiation; Temperature sensor also is installed on the described power device, guarantees device and hot water storage tank internal temperature rise below 95 degree, and can not produce air pressure and explosion.

In 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, described transfiguration circuit is made up of capacitor C 4, C5, C6, relay K Z1, KZ2, diode D3, D4, triode Q1, Q2, resistance R 9, R10 and chip IC 1, realizes being connected in parallel with C4 after described C5, C6 connect with relay K Z1, KZ2 respectively.

Compared with prior art, the utlity model has following marked improvement and outstanding feature: since with coil panel produce the copper loss heat directly return to pan again by the crystallite panel, thereby further promoted the thermal efficiency; And body of heater is enclosed, does not have radiator fan and inlet and outlet, has avoided cockroach, mosquito, oil smoke etc. to enter body of heater inside well, has guaranteed the body of heater cleaning inside, has also avoided the body of heater internal circuit to enter the short circuit scaling loss because of foreign matter; And cancelled radiator fan, eliminated the noise that fan and wind produced.Simultaneously, increased transfiguration frequency conversion adjusting power circuit, made the utility model can realize the continuous low power heating at circuit part.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the structural representation of existing electromagnetic oven;

Fig. 2 is the generalized section of existing coil panel;

Fig. 3 is a structural representation of the present utility model;

Fig. 4 is the generalized section of the utility model embodiment one coil panel;

Fig. 5 is the generalized section of the utility model embodiment two coil dish;

Fig. 6 is a circuit block diagram of the present utility model;

Fig. 7 is circuit theory diagrams of the present utility model.

The specific embodiment

As shown in Figure 3, Totally enclosed type induction cooker of the present utility model is a full-closed structure, and body assembly includes body of heater 7, crystallite panel 8, plastics face-piece 9, coil panel 10, power device 11, power device hot water storage tank 12, coil panel shield bracket 13 and circuit board.Also have main control board, control panel, power line etc. in addition.Be provided with plastics face-piece 9 between crystallite panel 8 and the body of heater 7, power device heat storage tank 6 is arranged on the interior bottom of body of heater 7, power device 11 is close on the outer wall of power device hot water storage tank 12, coil panel 7 is arranged on the below of crystallite panel 8, and both are closely contacted, dispel the heat to coil panel by the pan 23 that is placed on the boiler face, and be supported and fixed on the upper surface of power device hot water storage tank 12 by the coil panel shield bracket 13 of below.

Because coil panel 10 closely contacts with crystallite panel 8, utilize fabulous this characteristic of crystallite panel 8 vertical (up and down) heat transfer, the copper loss heat that coil panel 10 produces is passed to pan 23 by crystallite panel 8, thereby further promoted the thermal efficiency of complete machine.

Power device hot water storage tank 12 is equipped with the hot water storage tank of water in being, and make water volume be limited in below 90% of total capacity, other space is in order to the need of volumetric expansion behind the water freezing at low temperatures, utilize maximum these characteristics of water specific heat capacity, heat transferred water with power device 11 losses generation, water constantly discharges this heat to the space again in the heat of the loss generation of absorbed power device 11; Even electromagnetic oven is the time spent not, the unnecessary heat that water absorbs also can slowly discharge to the space.And the outer wall of power device 11 (IGBT power tube, rectifier bridge etc.) by the power device hot water storage tank 12 of aluminum conducts its heat to its inner water, the outer wall of power device hot water storage tank 12 just becomes a radiator at this moment, heat is dispelled the heat to the external world, simultaneously to its inner water savings heat.By design, the area of power device hot water storage tank 12 and the area that contacts with water are tried one's best greatly, do not flow even can guarantee water like this, also can allow heat evenly pass to inner water, 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.In the utility model, the material of power device hot water storage tank 12 can select for use the good aluminum or aluminum alloy of heat transfer property and other metal material to make, can be timely with heat transmission feedwater and to space heat elimination, also need have the variation of specific hot strength, yield strength, ductility and corresponding work hardening rate, even after freezing, also be not easy to break with fairness limit.Simultaneously, temperature sensor is installed also on power device 11, can guarantees that the temperature rise of device and hot water storage tank inside is controlled at below 95 degree, and can not produce air pressure and explosion.

Among first embodiment as shown in Figure 4, lead loop dish 10 is wrapped on the coil bracket by lead and forms, and high-insulation between making circle and enclosing, to avoid short circuit between coil, coil bracket adopts high-temperature insulation material (refractory ceramics, glass or high temperature plastic material), and the upper and lower faces at the coil panel lead all is equipped with soft magnetic bodies 14, so just can make coil panel 10 directly and crystallite panel 8 tightly contact, and can not cause magnetic saturation or wave distortion.

Among second embodiment as shown in Figure 5, soft magnetic bodies 14 is housed below the coil panel lead, the upper surface middle part of coil panel 10 is provided with groove 15, and soft magnetic bodies 14 is embedded in this groove 15, and coil panel 10 can more closely be contacted with crystallite panel 8.

As shown in Figure 6, circuit part of the present utility model, have only at the available circuit plate on the basis of power supply input, filter circuit 16, current rectifying and wave filtering circuit 17, network sampling circuit 18, accessory power supply 19 and control circuit 20, increased high-frequency oscillating circuits 21 and transfiguration circuit 22.

As shown in Figure 7, transfiguration circuit 22 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 are in 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 be decreased 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, and it is elementary that electric current flows through electromagnetic relay KZ2, and 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 9., Pin is all exported high level, the equal conducting of Q1, Q2, and 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.

According to technique scheme; those skilled in the art according to actual needs; also can design the Totally enclosed type induction cooker of more different structure forms; but the foregoing description is only enumerated for explanation the utility model; be not to be used to limit the utility model; the structure of any effects equivalent based on the conversion of the technical program institute all belongs to protection domain of the present utility model.

Claims

1, a kind of no fan Totally enclosed type induction cooker, include body of heater (7), crystallite panel (8), face-piece (9), coil panel (10), power device (11) and circuit board, it is characterized in that: described electromagnetic oven also comprises power device heat storage tank (12) and coil panel shield bracket (13), described body of heater (7) is a full-closed structure, crystallite panel (8) is connected with body of heater (7) by face-piece (9), power device heat storage tank (12) is arranged on the interior bottom of body of heater (7), power device (11) is attached on power device heat storage tank (12) outer wall or is embedded in the bottom, described coil panel (10) is close to the below of crystallite panel (8), and is supported and fixed on the upper surface of power device heat storage tank (12) or the body of heater drain pan or on the body of heater face-piece by the coil panel shield bracket of dividing into (13).

2, no fan Totally enclosed type induction cooker according to claim 1, it is characterized in that: described coil panel (10) directly is adhered to the bottom of crystallite panel (8).

3, no fan Totally enclosed type induction cooker according to claim 1, it is characterized in that: described coil panel (10) directly is fixedly arranged on the upper surface of power device heat storage tank (12).

4, no fan Totally enclosed type induction cooker according to claim 1 is characterized in that: described crystallite panel (8) is directly mutually bonding with body of heater (7).

5, according to claim 1 or 2 or 3 described no fan Totally enclosed type induction cookers, it is characterized in that: the upper and lower surface of described coil panel (10) is equiped with soft magnetic bodies (14).

6, no fan Totally enclosed type induction cooker according to claim 5 is characterized in that: the soft magnetic bodies that described coil panel is installed above (14) is embedded in the groove (15) of coil panel (10).

7, no fan Totally enclosed type induction cooker according to claim 1 is characterized in that: described power device heat storage tank (12) is a hot water storage tank.

8, no fan Totally enclosed type induction cooker according to claim 1, it is characterized in that: described power device also is equipped with temperature sensor on (11).

9, no fan Totally enclosed type induction cooker according to claim 1, it is characterized in that: described circuit board comprises high-frequency oscillating circuits (21) and transfiguration circuit (22), described high-frequency oscillating circuits (21) is made up of inductance L 2, capacitor C 4 and power device IGBT, described transfiguration circuit (22) is made up of capacitor C 4, C5, C6, relay K Z1, KZ2, diode D3, D4, triode Q1, Q2, resistance R 9, R10 and chip IC 1, realizes being connected in parallel with C4 after described C5, C6 connect with relay K Z1, KZ2 respectively.