CN201479410U

CN201479410U - Double-coil common-frequency interference preventer of induction cooker

Info

Publication number: CN201479410U
Application number: CN200920192080XU
Authority: CN
Inventors: 吴华平
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-08-31
Filing date: 2009-08-31
Publication date: 2010-05-19
Anticipated expiration: 2019-08-31

Abstract

A double-coil common-frequency interference preventer of an induction cooker comprises an induction cooker heating plate which is arranged in a casing, the heating plate is provided with an inner coil and an outer coil which are respectively provided with an input connecting terminal and an output connecting terminal, and an electrical clearance is arranged between the inner coil and the outer coil. The double-coil common-frequency interference preventer is characterized in that a metal ring which is concentric with the heating plate and higher than the coil plane is further arranged in the middle of the electrical clearance of the heating plate, and the metal ring is provided with a grounding wire. Compared with the prior art, an magnetic aluminum ring is arranged between the inner coil and the outer coil and extends outwards along the heating plate to be higher than the coil plane, then interaction of magnetic fields generated by the inner coil and the outer coil after being electrified is avoided, magnetic interference between the two coils can be minimized, and the induction cooker can be operated more stably and reliably.

Description

Electromagnetic oven twin coil co-channel interference protector

Technical field

The utility model relates to a kind of electromagnetic oven, particularly relates to a kind of electromagnetic oven twin coil co-channel interference protector.

Background technology

Electromagnetic oven is the flames of anger and power saving when using, and for family now is extensive use of, and progressively develops into applying of catering trade.Electromagnetic oven mainly is to utilize electromagnetic induction principle work, and electric current produces alternating magnetic fields by coil, and cuts variation repeatedly in the bottom of pan, so the pan bottom just produces cyclic currents (eddy current), makes pan heating itself.But, present most of electromagnetic oven all only uses a coil, watt level all can only produce heat in the zone that this coil covered, the electromagnetic oven that area coil is less then is not suitable for adding the bigger pan of thermal capacity, the electromagnetic oven that area coil is bigger, because the coil area coverage is wide excessively, then be not suitable for stir-fry dish cooked in a small wok, meaning the food is prepared with special care again, and electromagnetic oven can't realize that the inside and outside double-deck of large and small fire regulate as gas furnace, make applying of electromagnetic oven be greatly limited.

At above-mentioned this present situation, electromagnetic oven producer is at present all at the electromagnetic oven of research based on inside and outside twin coil, as the patent No. is that the Chinese utility model " a kind of heater coil disc that is used for high-power electromagnetic oven " of ZL200420090443.6 comprises that a chassis and is fixed on the heater coil with a pair of input, outlet terminal that closely is wound in by copper stranded conductor on this chassis face, it is characterized in that also comprising another concentric spacing ground heater coil that also has a pair of input, outlet terminal outside described heater coil around the home.Above-mentioned patent on a chassis face with intracardiac, two heater coils that turn to by copper stranded conductor of outer independent distribution, heater coil and outer heater coil promptly, though leave electric clearance between two coils, but, there is certain error in electric clearance between two coils when assembling, still be easy to generate the electromagnetism co-channel interference between the twin coil, or in use for some time, can reduce electric clearance because coil stationary is not firm or loosening, therefore, adopt the two coil configuration of above-mentioned patent can't solve the problem that dual coil electromagnetic disturbs well, make the poor stability of product, the failure rate height, for more powerful commerce electromagnetic oven, its influence is just more outstanding.

Summary of the invention

Technical problem to be solved in the utility model is to provide a kind of simple in structure and can avoid the electromagnetic oven twin coil co-channel interference protector of the electromagnetic interference between two coils effectively at above-mentioned prior art present situation.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: this electromagnetic oven twin coil co-channel interference protector, include an electromagnetic oven heating disk body that is arranged in the housing, this heating disk body is provided with interior loop and the exterior loop that has input, outlet terminal respectively and have electric clearance, it is characterized in that: described heating disk body also is provided with a circle and the concentric quoit that is provided with and exceeds coil plane of this heating disk body in the centre position of described electric clearance, also be provided with an earth connection on this quoit.

In order to reach effective shield effectiveness, avoid the electromagnetic interference between the inner-outer coil, as preferably, described quoit is a magnetic aluminium circle, and the thickness of this aluminium circle is 1～3mm, and the height that this aluminium circle exceeds described coil plane is for greater than 10mm.

As further preferred, the devitrified glass table top that described heating disk body is a spill, described interior loop is coiled in the bottom of this heating plate external surface equably, described exterior loop is coiled in the top of the outer surface of this heating disk body equably, and the electric clearance distance between described interior loop and the exterior loop is 20mm.

In order to guarantee that electromagnetic oven can be in different gear engaged, to adapt to different working site requirements, described protector also includes twin coil control cabinet and the fan that is arranged in the housing, described fan is arranged between described exterior loop and the described twin coil control cabinet, fan plays the effect of heat radiation, the exterior loop of electromagnetic oven is overheated when avoiding high power work, and, the input of described interior loop, outlet terminal inserts the first gear engaged loop that is arranged in the described twin coil control cabinet respectively, the input of described exterior loop, outlet terminal inserts the second gear engaged loop that is arranged in the described twin coil control cabinet respectively, earth connection one end on the described aluminium circle is fixed on this aluminium circle, and the other end connects described shell.

Compared with prior art, advantage of the present utility model is: the electromagnetic oven to two coil configuration of the prior art improves, between interior loop and exterior loop, be provided with a magnetic aluminium circle, this aluminium circle exceeds coil plane along external the stretching of heating plate, can avoid influencing each other of the electromagnetic field that produces separately after making interior loop and exterior loop switch at the same time, thereby make electromagnetic interference between two coils reduce to minimum, make the work that electromagnetic oven can be more reliable and more stable.In addition, the utility model has adopted the mode of heating of twin coil, the user can select independent interior loop work or exterior loop work as required, and perhaps interior loop and exterior loop different gear such as work simultaneously makes electromagnetic oven also have the function of automatic selection heating firepower size.

Description of drawings

Fig. 1 is the three-dimensional decomposition texture schematic diagram (removing housing) of the utility model embodiment.

Fig. 2 is the three-dimensional structure diagram of heater coil disc shown in Figure 1.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As shown in Figure 1 and Figure 2, be the electromagnetic oven structure schematic diagram of present embodiment, include the twin coil control cabinet 1, fan 2 and the electromagnetic oven heating disk body 3 that are separately positioned in the electromagnetic oven housing (not shown);

Wherein, heating disk body 3 is one to be the devitrified glass table top of spill, this heating disk body 1 has coiled interior loop 4 equably in the bottom of outer peripheral face, interior loop 4 has power supply input terminal 42 and outlet terminal 42, upper disc at these heating disk body 3 outer peripheral faces is wound with exterior loop 5, exterior loop 5 has electric current input terminal 52 and electric current outlet terminal 52 equally, install for the ease of wiring, the power supply input terminal 41 of interior loop 4 and outlet terminal 42 are arranged on first conduit interior 6 simultaneously, and insert in the first gear loop that is arranged in the twin coil control cabinet 1,52 of the power supply input terminal 51 of exterior loop 5 and outlet terminals are arranged in second conduit 7 simultaneously, and insert in the second gear loop that is arranged on equally in the twin coil control cabinet 1;

Be provided with a circle electric clearance that is about 20mm at interval between interior loop 4 and the exterior loop 5, also be provided with the magnetic aluminium circle 8 that a circle and heating disk body are provided with one heart in the centre position of this electric clearance, aluminium circle 8 is substantially parallel and above coil plane with the cross section of heating disk body, in order to guarantee the effect of electromagnetic isolation, the thickness of this aluminium circle 8 is that 1～3mm is good, the aluminium circle exceeds the height of coil plane greater than more than the 10mm, on aluminium circle 8, also be provided with a punching, one earth connection, 9 one ends pass punching and link to each other with aluminium circle 8, and the other end of earth connection 9 links to each other with the electromagnetic oven housing and is grounded;

Cause coil overheated for fear of high-power heating, fan 2 is arranged between exterior loop 5 and the twin coil control cabinet 1, plays certain thermolysis, reduces the working temperature of coil.

The electromagnetic oven of present embodiment is the high-power high-frequency electromagnetic oven, its operating power is 5kw-30kw, and working power adopts the 380V/50Hz three-phase alternating current, and its higher-order of oscillation frequency is 20-50KHz, owing to adopted twin coil, can select different heating powers according to actual needs.

When selecting low-grade location, the interior loop work of electromagnetic oven, heater coil heats the demand that adapts to low-power, small size heating separately in can utilizing; When selecting high tap position, interior loop and exterior loop are worked simultaneously, in can utilizing, outer heater coil heats together and adapts to high power, large tracts of land is the demand of heating evenly, at this moment, because the frequency of two coils is the same during work, the big electric current of alternation of two coils of flowing through can produce then with electromagnetic field frequently, very easily produce co-channel interference, owing between twin coil, be provided with ground connection aluminium circle, under the iris action of aluminium circle, the electromagnetic field that makes two coils be produced when work is independent of each other, and prevents the co-channel interference of twin coil effectively, has guaranteed fail safe and reliability that electromagnetic oven uses.

Claims

1. electromagnetic oven twin coil co-channel interference protector, include an electromagnetic oven heating disk body that is arranged in the housing, this heating disk body is provided with interior loop and the exterior loop that has input, outlet terminal respectively and have electric clearance, it is characterized in that: described heating disk body also is provided with a circle and the concentric quoit that is provided with and exceeds coil plane of this heating disk body in the centre position of described electric clearance, also be provided with an earth connection on this quoit.

2. electromagnetic oven twin coil co-channel interference protector according to claim 1 is characterized in that: described quoit is a magnetic aluminium circle, and the thickness of this aluminium circle is 1～3mm, and the height that this aluminium circle exceeds described coil plane is greater than 10mm.

3. electromagnetic oven twin coil co-channel interference protector according to claim 1 and 2, it is characterized in that: the devitrified glass table top that described heating disk body is a spill, described interior loop is coiled in the bottom of this heating plate external surface equably, described exterior loop is coiled in the top of the outer surface of this heating disk body equably, and the electric clearance distance between described interior loop and the exterior loop is 20mm.

4. electromagnetic oven twin coil co-channel interference protector according to claim 3, it is characterized in that: described protector also includes twin coil control cabinet and the fan that is arranged in the housing, described fan is arranged between described exterior loop and the described twin coil control cabinet, and, the input of described interior loop, outlet terminal inserts the first gear engaged loop that is arranged in the described twin coil control cabinet respectively, the input of described exterior loop, outlet terminal inserts the second gear engaged loop that is arranged in the described twin coil control cabinet respectively, earth connection one end on the described aluminium circle is fixed on this aluminium circle, and the other end connects described shell.