CN2862896Y - Electric cooker having good cooking function - Google Patents

Abstract

An electric food warmer with high cooking performance is provided, which is comprised of a circuit breaker for boiling food and magnetic steel temperature limiter. It is characterized in that: the magnetic steel cap of the temperature limiter closely contacts an electric heating component, which is isolated with the electric hot tray of the warmer. As for the circuit structure, the electric heating component connects with the circuit breaker in parallel. Moreover, the component connects with the inching switch of magnetic steel temperature limiter and electric hot tray of the warmer in series. The utility model will not switch off power source when the food is boiling but maintains the hot tray to continue emitting heat and then utilizes heat of electric heating component to activate the temperature limiter and cut off power source of hot tray, thus ensuring well-done food and exhibiting good cooking performance. As for the electric food warmer with ceramic liner, the utility model can still ensure well-done food with delicious flavor and lower cost.

Description

Electric food warmer with the performance of well cooking

Technical field

The utility model relates to the control circuit of electric food warmer, particularly has the electric food warmer of rice-cooking function.

Background technology

In vogue in the market a kind ofly have rice-cooking function, and with the electric food warmer (also claim electric heating cooker, below be referred to as electric food warmer) of pottery as inner bag, for example electric heating marmite, electric heating boccaro pot.The temperature difference is bigger between the outer wall of this electric food warmer inner bag and the inwall, aspect the relevant control circuit of realizing rice-cooking function, can not utilize the temperature of magnetic steel temperature limiter direct detection inner bladder outer wall, otherwise magnetic steel temperature limiter can disconnect prematurely as the electric food warmer that adopts aluminum liner.In order to realize that water does the rice-cooking function of outage, existing this electric food warmer adopts a boiling cut-off switch usually, and when meal boils to boiling, the boiling cut-off switch disconnects at once, stops heating, utilizes waste heat that meal is vexed ripe.The shortcoming of this control mode is since after boiling deenergization at once, therefore boil into half-cooked rice easily, promptly enable meal is boiled, also be difficult to boil to well-done, influence mouthfeel.For overcoming this shortcoming, other has some electric food warmers to adopt the timing control circuit that is made of semiconductor element, in the mode of intermittently power-on meal is boiled to well-done, though can overcome aforesaid drawbacks like this, cost is higher, is difficult to improve product competitiveness.

Summary of the invention

The purpose of this utility model is at above-mentioned shortcoming, provide a kind of with simple control circuit and cheaply device just can reach the electric food warmer of the performance of well cooking.

The utility model is achieved in that electric food warmer comprises an inner bag, an electric hot tray that closely contacts with inner bag, a boiling cut-off switch of connecting with electric hot tray, and magnetic steel temperature limiter, magnetic steel temperature limiter comprises microswitch, the magnet steel cap and be connected in microswitch and the magnet steel cap between link gear, link gear is provided with button, especially, the magnet steel cap of magnetic steel temperature limiter closely contacts with a heating, the electric hot tray heat of this heating and electric food warmer is isolated, on circuit structure, this heating is in parallel with the boiling cut-off switch of electric food warmer, simultaneously, this heating also with the microswitch of magnetic steel temperature limiter, the electric hot tray of electric food warmer constitutes series relationship.Operation principle of the present utility model is: press button in the link gear of magnetic steel temperature limiter with hand when cooking, link gear touches the microswitch of magnetic steel temperature limiter, the microswitch closure, simultaneously, link gear makes permanent magnet and the soft magnet adhesive in the magnet steel cap, makes link gear remain on to touch the state of microswitch; Microswitch is connected the loop of electric hot tray, and the electric hot tray heating begins to cook; Boil to the boiling at meal, the boiling cut-off switch of electric food warmer remains closure state, and with the cut-off switch short circuit of being seethed with excitement of heating that the magnet steel cap closely contacts, the magnet steel cap remains at the normal temperature state; When meal boils to boiling, the boiling cut-off switch disconnects, and the heating that closely contacts with the magnet steel cap begins heating power, and this moment, the temperature of magnet steel cap did not reach operating temperature as yet, therefore the microswitch of magnetic steel temperature limiter remains closure, and electric hot tray continues to keep heating; After after a while, heating makes the temperature of magnet steel cap reach degree more than 100, soft magnet loses magnetism in the magnet steel cap, under the spring force effect in the magnet steel cap, soft magnet in the magnet steel cap separates with permanent magnet, and affects link gear, makes link gear return to button and presses preceding original state, the disconnection so the microswitch of magnetic steel temperature limiter returns to normal, electric hot tray outage stopping heating; After this just rely on the heat-insulation and heat-preservation effect of inner bag, utilize waste heat that meal is boiled.This shows that the utility model boils to the boiling not deenergization immediately at meal, but continues to keep the electric hot tray heating power, just disconnects the electric hot tray power supply after after a while, so just can guarantee meal is boiled to well-done, has the good performance of cooking.

The utility model has the advantages that for the electric food warmer of pottery, can guarantee meal is boiled to well-done that the rice-mouth sense that cooks is good as inner bag.Need not to adopt the timing control circuit that constitutes by semiconductor element.The heating that is added only is used for magnet steel cap heating, and power demand is very little, and cost of manufacture is very low, and whole magnetic steel temperature limiter also is to belong to a large amount of cheap accessories of popularizing, and therefore the utlity model has cheap advantage.On the other hand, the actual power that is decided by the heating that closely contacts with the magnet steel cap actuation time of magnetic steel temperature limiter, when supply voltage is on the low side, heating need be switched on, and the time of length just can make the magnetic steel temperature limiter action, can prolong the heat time heating time of electric hot tray thus, otherwise, when supply voltage is higher, can correspondingly shorten the heat time heating time of electric hot tray again, so the utility model can also play certain compensating action to departing from of supply voltage.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the circuit theory diagrams of the utility model embodiment 1.

Fig. 3 is the circuit theory diagrams of the utility model embodiment 2.

The specific embodiment

Referring to Fig. 1, electric food warmer comprises an inner bag 1 made from pottery, and inner bag 1 closely contacts with electric hot tray 2, and boiling cut-off switch K2 is installed in the pot cover of electric food warmer.The magnetic steel temperature limiter that is installed in electric food warmer bottom by microswitch K1, magnet steel cap 3 and be connected in microswitch K1 and magnet steel cap 3 between link gear constitute.The internal structure (not shown) of magnet steel cap 3 is the same with commercially available magnetic steel temperature limiter, comprises a soft magnet and a permanent magnet, and acts on the spring between soft magnet and the permanent magnet.At normal temperatures, the link gear by magnetic steel temperature limiter can make soft magnet and permanent magnet adhesive, and when magnet steel cap temperature reaches when spending 100 more, soft magnet loss of excitation, spring make soft magnet separate with permanent magnet.The link gear of magnetic steel temperature limiter is the same with commercially available magnetic steel temperature limiter among the figure, adopts leverage, and an end of lever 4 is fixed with button 5, and the other end and magnet steel cap 3 interior soft magnets connect.Magnet steel cap 3 closely contacts with a heating 6.Heating 6 is fixed on the bottom of the outer courage 7 of electric food warmer.Heating 6 can adopt small power electric heated filament or ceramic PTC heater element to make.Be filled with heat insulation foam 8 between courage 7 and the electric hot tray 2 outside, heating 6 and electric hot tray 2 heat are isolated.Referring to Fig. 2, electric hot tray 2 is connected with boiling cut-off switch K2, and heating 6 is in parallel with boiling cut-off switch K2, and simultaneously, heating 6 also constitutes series relationship with the microswitch K1 of magnetic steel temperature limiter, the electric hot tray 2 of electric food warmer.

As further improvement, referring to Fig. 1, present embodiment is provided with the thimble 9 and the driving lever 10 of mutual interlock, driving lever 10 connects with a spring 11, the force direction of 11 pairs of driving levers 10 of spring, stir the link gear action of magnetic steel temperature limiter for impelling driving lever 10, force the soft magnet in the magnet steel cap 3 to separate with permanent magnet, direction to the microswitch K1 disconnection that makes magnetic steel temperature limiter, the pass of thimble 9 and driving lever 10 interlocks is, when electric food warmer inner bag 1 was pressed on the thimble 9, thimble 9 drove driving lever 10 towards the direction motion that overcomes spring 11 active forces.Particularly, thimble 9 and driving lever 10 are connected in the two ends of a lever 12 respectively, lever 12 is hinged on the bottom of outer courage 7, thimble 9 upwards runs through electric hot tray 2 until contacting with inner bag 1, driving lever 10 is downwards near the lever 4 in the magnetic steel temperature limiter link gear, spring 11 acts on the lever 12, makes driving lever 10 have the trend of downward shifting lever 4.After setting up thimble 9 and driving lever 10, can play the effect that prevents the error starting electric food warmer, its principle is: at state shown in Figure 1, inner bag 1 is being pressed thimble 9, thimble 9 overcomes spring force by lever 12 drive driving levers 10 and moves up to shown position, the lever 4 that driving lever 10 is broken away from the magnetic steel temperature limiter link gear, this moment is if press the button 5 of magnetic steel temperature limiter, the left end perk of lever 4, soft magnet and permanent magnet adhesive in the magnet steel cap 3, lever 4 is pushed microswitch K1 simultaneously, and microswitch K1 is remained closed, electric hot tray 2 energisings, electric food warmer normally starts; If inner bag 1 is taken out, thimble 9 loses the restriction of inner bag 1, so spring 11 drives driving lever 10 and presses down on the lever 4, force lever 4 to reset, to the soft magnet in the magnet steel cap 3 is separated with permanent magnet, microswitch K1 recovers off-state simultaneously, and electric hot tray 2 stops heating, so just can prevent that under the situation of not placing inner bag 1 mistake starts electric food warmer.

Illustrate that below in conjunction with Fig. 1, Fig. 2 present embodiment realizes the operation principle of rice-cooking function: press button 5 in the link gear of magnetic steel temperature limiter with hand when cooking, lever 4 in the link gear touches microswitch K1, microswitch K1 closure, and make permanent magnet and soft magnet adhesive in the magnet steel cap 3, so microswitch K1 remains on closure state, electric hot tray 2 heating powers begin to cook; Boil to the boiling at meal, the boiling cut-off switch K2 of electric food warmer remains closure state, and the heatings 6 that closely contact with magnet steel cap 3 are by short circuit, and magnet steel cap 3 is in the normal temperature state all the time; When meal boils to boiling, the high temperature that boiling steam produces disconnects the boiling cut-off switch K2 in the pot cover, and with the heatings 6 beginning heating powers that magnet steel cap 3 closely contact, this moment, microswitch K1 remained closure, and electric hot tray 2 continues to keep heating; After after a while, heating 6 makes the temperature of magnet steel cap 3 reach degree more than 100, soft magnet in the magnet steel cap 3 separates with permanent magnet, and affect lever 4, lever 4 is returned to press the button 5 preceding original states, the disconnection so microswitch K1 returns to normal, electric hot tray 2 outages stop heating; After this just rely on the heat-insulation and heat-preservation effect of inner bag 1, utilize waste heat that meal is boiled.This shows that present embodiment boils to the boiling not deenergization immediately at meal, but continues to make electric hot tray 2 heating powers after a period of time, just disconnects the power supply of electric hot tray 2, thereby can guarantee meal is boiled to well-done.

Embodiment shown in Figure 3 is to have increased on-off switch K3 and functional select switch K4 at automatic intermittence on the basis of Fig. 2, and is difunctional to realize cooking, cook congee.When K4 beat at a point, intermittently on-off switch K3 was inoperative automatically, and the operation principle of entire circuit is identical with Fig. 2, can realize rice-cooking function.When K4 beat at the b point, inoperative with the heating 6 that the magnet steel cap closely contacts, the microswitch K1 of magnetic steel temperature limiter was not subjected to the influence of heating 6.Present embodiment realizes that the principle of gruel boiling function is: after pressing the button of magnetic steel temperature limiter, microswitch K1 is kept closed always, electric hot tray 2 heating powers; Before boiling, boiling cut-off switch K2 closure, intermittently on-off switch K3 is inoperative automatically; When congee boils to boiling, boiling cut-off switch K2 disconnects, automatically intermittently on-off switch K3 starts working, heating r heating power after a period of time when on-off switch K3 inside at automatic intermittence, automatically intermittently the break contact S of on-off switch K3 inside disconnects, heating r and electric hot tray 2 stop heating simultaneously, heating r is through after of short duration cool time, it is closed that break contact S recovers, heating r and electric hot tray 2 recover heating once more, so repeatedly, electric hot tray 2 is intermittently switched on, thereby realize long gruel boiling function.

Above embodiment only is to indicative explaination of the present utility model, is not to restriction of the present utility model, on this basis multiple variation or distortion can be arranged.For example, though design of the present utility model just the ancestor be at the electric food warmer of pottery as inner bag, implementation condition is not subjected to the restriction of liner material, for the inner bag made from materials such as enamel, cast irons, is equally applicable to the utility model; And for example, magnet steel cap 3 and heating 6 are not limited to install in the position shown in the figure 1, be connected in the link gear between microswitch K1 and the magnet steel cap 3, also be not limited to adopt the lever construction of Fig. 1, as long as heating 6 is isolated with electric hot tray 2 heat of electric food warmer, and can control soft magnet in microswitch K1 and the magnet steel cap 3 by link gear, just can arbitrarily arrange above-mentioned each device; For another example, the boiling cut-off switch K2 among Fig. 1 can adopt bimetal strip thermostat or other forms of temperature controller, and its position also is not limited to be installed in the pot cover, as long as can guarantee can not disconnect too early before boiling, can in time disconnect after boiling and getting final product; And so on, all variations that are equal to or distortion all belong to protection domain of the present utility model.

Claims (3)

1, a kind of electric food warmer with the performance of well cooking, comprise an inner bag, an electric hot tray that closely contacts with inner bag, a boiling cut-off switch of connecting with electric hot tray, and magnetic steel temperature limiter, magnetic steel temperature limiter comprises microswitch, the magnet steel cap and be connected in microswitch and the magnet steel cap between link gear, link gear is provided with button, it is characterized in that: the magnet steel cap of magnetic steel temperature limiter closely contacts with a heating, the electric hot tray heat of this heating and electric food warmer is isolated, on circuit structure, this heating is in parallel with the boiling cut-off switch of electric food warmer, simultaneously, this heating also with the microswitch of magnetic steel temperature limiter, the electric hot tray of electric food warmer constitutes series relationship.

2, electric food warmer as claimed in claim 1, it is characterized in that: the thimble and the driving lever that are provided with mutual interlock, driving lever connects with a spring, spring is stirred the link gear action of magnetic steel temperature limiter to the force direction of driving lever for impelling driving lever, forces the soft magnet in the magnet steel cap to separate with permanent magnet, direction to the microswitch disconnection that makes magnetic steel temperature limiter, the relation of thimble and driving lever interlock is that when the electric food warmer inner bag was pressed on the thimble, thimble drove driving lever towards the direction motion that overcomes spring force.

3, electric food warmer as claimed in claim 2, it is characterized in that: thimble and driving lever are connected in the two ends of a lever respectively, lever is hinged on the bottom of the outer courage of electric food warmer, and thimble upwards runs through electric hot tray until contacting with inner bag, and driving lever is the link gear of close magnetic steel temperature limiter downwards.

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