CN201365810Y

CN201365810Y - Anti-overheating protection device for electric cooker

Info

Publication number: CN201365810Y
Application number: CNU2009200517402U
Authority: CN
Inventors: 梁爱华
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-02-24
Filing date: 2009-02-24
Publication date: 2009-12-23
Anticipated expiration: 2019-02-24

Abstract

The utility model belongs to an anti-overheating protection device for an electric cooker, which comprises an electric cooker body part and a circuit part. An electric cooker casing is sleeved on a inner container; a heating plate is fixed at the bottom part of the inner container; a steel magnet temperature limiter is fixed in a central hole of the heating plate; a lever switch is fixed at the bottom part of the inner container and the tail end of the lever switch is connected with the steel magnet temperature limiter; a warmer is fixed on the special seat for the heating plate; an input socket and a switch box are mounted on the casing of the electric cooker; and a temperature controller is mounted at the bottom part of the inner container. The circuit part adopts the structure that a cook circuit including a return circuit formed through connecting the input socket with a heat fuse XP, the heating plate R1, the temperature controller T2 and the lever switch AN in sequence; and the temperature controller T2 is discontinuously electrified through closed conduction and switch off now and then. The utility model solves the technical difficult problems in the industry of electric cookers, prolongs the service life of the electric cooker, improves security and reliability, and achieves high applicability.

Description

Protective device for preventing overheat of electric rice cooker

Technical field

The utility model belongs to household electrical appliance technical field, particularly a kind of protective device for preventing overheat of electric rice cooker.

Background technology

During electric cooker ubiquity user improper use at present, will take place because of the overheated faults such as heat-generating disc or thermal fuse-link that burn out.Improper use generally has following several situation: 1. the pot courage is not put just not in place; 2. the pot courage at the bottom of the R facial disfigurement; 3. pot courage bottom surface is stained with foreign matter; 4. heat-generating disc R facial disfigurement; 5. there is foreign matter on the heat-generating disc surface; 6. long-time dry combustion method; 7. suppressing the button energising uses; 8. supply voltage instability.All can make electric cooker occur overheated under above-mentioned a certain situation and break down, this just must and be attached to the guide of caveat on pot body by operation instructions, avoid the situation generation of improper use.But; existing electric cooker prevented thermal technology; thermal fuse-link of the employing that has is made protective device; can only play the effect of anti-high heat and fire; in case this over-temperature protection works; this electric cooker can not be continued usefulness again with regard to burning out, and the bad electric cooker of often receiving in the after-sale service all belongs to this class fault.What have burns out heat-generating disc when the improper use for fear of electric cooker, adopts in the heating card and sprays a coating, though can improve the refractory point of heat-generating disc, does not protect working of plastics and electricity piece.

Summary of the invention

The purpose of this utility model is in order to overcome the deficiency that above-mentioned prior art exists; providing a kind of can not be out of shape because of improper use, pot inner bag bottom surface or heat-generating disc; make overheating of electric rice cooker and break down, also need not protective device for preventing overheat of electric rice cooker at heat-generating disc surface sprayed coating.

For achieving the above object, the technical scheme that the utility model is taked is, this protective device for preventing overheat of electric rice cooker comprises electric cooker pot body portion and circuit part, the electric cooker shell entangles the middle level, heat-generating disc is fixed on the bottom, middle level, magnetic steel temperature limiter is fixed in the heat-generating disc centre bore, lever switch is fixed on the bottom, middle level, it is not held with magnetic steel temperature limiter and is connected, warmer is fixed on the special-purpose seat leg of heat-generating disc, input socket and switch enclosure are installed on the electric cooker shell, and thermostat is equipped with in bottom, described middle level; Described circuit part: the circuit of cooking is that input socket is connected to form the loop with thermal fuse-link xp, heat-generating disc R1, thermostat T2 and lever switch AN successively, closed conducting when described thermostat T2 is, the time take-off open circuit, form and be interrupted energising; Thermal circuit is that input socket XP is connected with thermal fuse-link XP, heat-generating disc R1 and warmer R2 successively, forms the loop; Indicator light circuit is divided into cook indicator light circuit and insulation indicator light circuit, and the indicator lamp of cooking is that input socket XP is connected to form the loop with thermal fuse-link FU, the lamp XD2 that cooks, resistance R 4 and lever switch AN successively; The insulation indicator light circuit is that input socket XP is connected to form the loop with thermal fuse-link FU, resistance R 5, R4, R3 and insulation lamp successively.

Described thermostat T2 is reducible temperature sensitive switch, and its temperature control value temperature range is 140-220 ℃.

Described thermostat T2 is Kick type temperature sensitive switch, flashing temperature sensitive switch or Mageneto-sensitive type temperature sensitive switch.

The utility model protective device for preventing overheat of electric rice cooker, owing to set up thermostat in bottom, electric cooker middle level, and circuit is improved, make electric cooker have anti-overheat protective function.Its advantage is as follows:

1, solved the technical barrier of electric cooker on the industry.Burn out heat-generating disc when the improper use for fear of electric cooker, adopt in the heating card and spray a coating,, do not protect working of plastics and electricity piece though can improve the refractory point of heat-generating disc.After having adopted the temperature control constant temperature technology that to reset, overcome this difficult problem.

2, prolong the service life of electric cooker.Limited the appearance of high temperature, the steady temperature scope, thus make the electric cooker element can Yin Gaowen and cause premature loss or break down, simultaneously,, also can continue to use even pot courage bottom R face or heat-generating disc R face have slight deformation.

3, improve security reliability.On former fuse-link protector basis, increase the temperature control constant temperature protection that to reset together again, thereby this electric cooker can not burnt out or fire incident occurs, have the double insurance effect.

4, adaptability is strong.Arbitrarily operation can not cause the electric cooker accident of burning, and the people who adapts to different levels uses, and even need not guide also and can not ruin electric cooker.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the utility model circuit diagram.

The specific embodiment

As shown in Figure 1; protective device for preventing overheat of electric rice cooker of the present utility model comprises electric cooker pot body portion and circuit part; electric cooker pot body portion is mainly by electric cooker shell 1; middle level 2; heat-generating disc 7; input socket 8; thermostat 9; magnetic steel temperature limiter 10; lever switch 11; switch enclosure 3; pot courage 4 and pot cover 5 are formed; electric cooker shell 1 entangles middle level 2; heat-generating disc 7 is fixed on the bottom in middle level 2; pot courage 4 places in the middle level 2; the bottom contacts with heat-generating disc 7; pot cover 5 is placed on pot courage 4; magnetic steel temperature limiter 10 is fixed in the centre bore of heat-generating disc 7; lever switch 11 is fixed on 2 bottoms, middle level; it is not held with magnetic steel temperature limiter 10 and is connected, and warmer is fixed on the special-purpose seat leg of heat-generating disc 7, and input socket 8 and switch enclosure 3 are installed on the electric cooker shell 1; thermostat 9 is fixed on 2 bottoms, middle level, and its sensitive surface overlays 2 surfaces in the middle level.

Circuit part as shown in Figure 2, dotted portion is an indication lamp plate assembly circuit, form by insulation lamp XD1, insulation lamp dropping resistor R3, the lamp dropping resistor R4 that cooks, cook lamp divider resistance R5 and the lamp XD2 that cooks, indicator light circuit is divided into cook indicator light circuit and insulation indicator light circuit, and the indicator lamp of cooking is that input socket XP is connected to form the loop with thermal fuse-link FU, the lamp XD2 that cooks, resistance R 4 and lever switch AN successively; The insulation indicator light circuit is that input socket XP is connected to form the loop with thermal fuse-link FU, resistance R 5, R4, R3 and insulation lamp successively.What dotted line was outer is the main road operating circuit, form by heat-generating disc R1, warmer R2, thermal fuse-link FU, input socket XP, magnetic steel temperature limiter T1, thermostat T2 and lever switch AN, press lever switch AN button when cooking, thermostat T1 adhesive, electric current forms the loop from the phase line L of input socket XP through the zero line N that thermal fuse-link FU, heat-generating disc R1, thermostat T2 and lever switch AN get back to input socket XP, and main heater circuit is worked always and finished up to the work of cooking.Electric cooker when improper use, closed conducting when thermostat T2 is in, the time take-off open circuit, form and be interrupted energising, when overheating of electric rice cooker, main heater circuit quits work, temperature is resumed work again after dropping to setting value.Therefore, the electric cooker of having realized both having prevented overtemperature protection makes it to continue to finish the work of boiling again.Described thermostat T2 is reducible temperature sensitive switch spare, is Kick type temperature sensitive switch, flashing temperature sensitive switch or Mageneto-sensitive type temperature sensitive switch.Its temperature control value is by different structure, the electric cooker of different size, and the position that thermostat T 2 arranges is and selected, and the thermostat temperature scope that this temperature control value is realized must meet two conditions: 1. electric cooker is when normal correct the use, and this thermostat T2 is inoperative; 2. electric cooker is when improper use, and the highest being unlikely of temperature destroyed the electric cooker element during thermostat T2 take-off OFF.

After meal was cooked, thermostat T1 action drove lever switch AN tripping operation and enters keeping warm mode, and electric current is got back to zero line N by phase line L through thermal fuse-link FU, heat-generating disc R1 and warmer R2 and formed the loop.

Below be that example is described further with Xisi, famous beauty in the late Spring and Autumn Period's electric cooker:

Thermostat T2 selects the Kick type temperature sensitive switch for use, OFF165 ℃ of selected parameter take-off, reset ON150 ℃, press switch key 6, under normal correct operating position, 2 bottom thermostat T, 2 sensitive surface temperature≤130, electric cooker middle level ℃, at this moment thermostat T2 is normally closed conducting, heat-generating disc R1 is in the energising heated condition always, and the electric cooker fault-free is working properly.But; as user during, as heat-generating disc R1 card foreign matter is arranged, at this moment in improper use; pot courage 4 bottoms and heat-generating disc R1 surface loose contact; cause heat-transfer effect bad, and then make the progressively long-pending heat in 2 bottoms, middle level too high (just burning out heat-generating disc R1 or thermal fuse-link FU easily), when reaching 165 ℃ as if long-pending hot temperature in case surpass 200 ℃; thermostat T2 action tripping is the OFF state; the power supply of heat-generating disc R1 main circuit is cut off and suspends heating, and temperature descends thereupon, thereby has protected electric cooker not burnt out.When being reduced to 150 ℃ along with temperature, it is the ON state that thermostat T2 resets closed, heat-generating disc R1 switches on once more and carries out heating work, though also can make its kettle temperature constant in a temperature range that can not be burnt out as electric cooker is under the situation of improper use, drive lever switch AN tripping operation up to magnetic steel temperature limiter T1 action, enter keeping warm mode, the work of cooking is finished.

The summary of its operation principle is: under normal correct operating position, drive lever switch AN adhesive for magnetic steel temperature limiter T1 and thermostat T2 normally closed → the ripe magnetic steel temperature limiter T1 drive of the heat-generating disc R1 heating → meal lever switch AN keeping warm mode that trips → enter; Under the improper use situation, drive the lever switch adhesive for magnetic steel temperature limiter T1 and thermostat T2 closure → heat-generating disc R1 heating → thermostat T2 tripping → heat-generating disc R1 stop heating → thermostat T2 closure → heat-generating disc R 1 and heat once more → ... the ripe magnetic steel temperature limiter T1 drive of → meal lever switch AN keeping warm mode that trips → enter.No matter under which kind of situation, electric cooker can not burnt out, and can finish the work of boiling.

Claims

1, a kind of protective device for preventing overheat of electric rice cooker, comprise electric cooker pot body portion and circuit part, the electric cooker shell entangles the middle level, heat-generating disc is fixed on the bottom, middle level, and magnetic steel temperature limiter is fixed in the heat-generating disc centre bore, and lever switch is fixed on the bottom, middle level, it is not held with magnetic steel temperature limiter and is connected, warmer is fixed on the special-purpose seat leg of heat-generating disc, and input socket and switch enclosure are installed on the electric cooker shell, it is characterized in that: thermostat is equipped with in described middle level (2) bottom; Described circuit part is the circuit of cooking, thermal circuit and indicator light circuit, the circuit of cooking is that input socket XP is connected to form the loop with thermal fuse-link XP, heat-generating disc R1, thermostat T2 and lever switch AN successively, closed conducting when described thermostat T2 is, the time take-off open circuit, form and be interrupted energising; Thermal circuit is that input socket XP is connected with thermal fuse-link XP, heat-generating disc R1 and warmer R2 successively, forms the loop.

2, according to the described protective device for preventing overheat of electric rice cooker of claim 1, it is characterized in that: described thermostat T2 is reducible temperature sensitive switch, and its temperature control value temperature range is 140-220 ℃.

3, according to the described protective device for preventing overheat of electric rice cooker of claim 2, it is characterized in that: described thermostat T2 is Kick type temperature sensitive switch, flashing temperature sensitive switch or Mageneto-sensitive type temperature sensitive switch.

4, according to the described protective device for preventing overheat of electric rice cooker of claim 1, it is characterized in that: described indicator light circuit is divided into cook indicator light circuit and insulation indicator light circuit, and the indicator lamp of cooking is that input socket XP is connected to form the loop with thermal fuse-link FU, the lamp XD2 that cooks, resistance R 4 and lever switch AN successively; The insulation indicator light circuit is that input socket XP is connected to form the loop with thermal fuse-link FU, resistance R 5, R4, R3 and insulation lamp successively.