CN2528343Y

CN2528343Y - Electric cooker capable of cooking congee

Info

Publication number: CN2528343Y
Application number: CN 02225979
Authority: CN
Inventors: 马冯传
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-02-26
Filing date: 2002-02-26
Publication date: 2003-01-01
Anticipated expiration: 2012-02-26

Abstract

The utility model relates to an electric cooker capable of cooking congee. The electric cooker is connected with the two-way controlled silicon in series in the current loop of a heating body. An additional divider circuit is communicated with the electric power line of the electric cooker. The divider circuit at least comprises an electric capacity and a heat variable resistor which are in parallel. The electric capacity and heat variable resistor which are in parallel pass a two-way trigger diode. The two-way trigger diode is connected to the gate of the two-way controlled silicon. The electric capacity and heat variable resistor which are in parallel is connected in series to a pair of control ports. A steam passage is opened in a heat variable resistor which has an interlace structure. The heat variable resistor is arranged in the steam passage. Compared with the patent ZL01256256.4, the utility model cancels a moving and breaking type temperature sensor. The operating temperature of the heat variable resistor reduced extremely. Therefore, the performance of the electric cooker is more reliable and quality is more stable.

Description

The electric food warmer of capable of cooking congee

Technical field

The utility model relates to a kind of electric food warmer of electric heating appliance for cooking, particularly capable of cooking congee.

Background technology

ZL01256256.4 number, are called " electric food warmer of capable of cooking congee " utility model patent, a kind of electric food warmer of controlling the capable of cooking congee of heater switching electricity with bidirectional triode thyristor is disclosed, its basic functional principle is to utilize the conducting state of two temperature-sensing element control bidirectional triode thyristors, make the energising of heater (also claiming electric hot plate, heating wire) gap, to reach the purpose that congee is intermittently seethed with excitement and do not overflow.Though this electric food warmer has certain advantage, but because its two used temperature-sensing elements are respectively moving fault temperature detector and the thermistor of being close to heater, therefore in use obviously there is following shortcoming: 1. owing to be difficult to purchase a large amount of accuracy height, little, the cheap moving fault temperature detector of performance parameter dispersiveness in the reality, therefore bring difficulty to production in enormous quantities; 2. because heater temperature height, so the thermistor work under bad environment, damage easily, directly influenced the service life of electric food warmer; 3. after using a period of time; will be between heater and the pot courage because of oxidation and the dirt that accumulates loose contact; the heater temperature is far above pot courage temperature; regular meeting causes the congee in the pot not to be heated to required temperature as yet like this; thermistor just is reduced to the low resistance state that bidirectional triode thyristor is turn-offed because of the heater temperature is too high; the result makes congee can't remain on the intermittently state of boiling, has influenced the quality of cooking congee.

Summary of the invention

The purpose of this utility model is to improve on the basis of number patent, and the electric food warmer of a kind of more reliable performance, more stable capable of cooking congee is provided.

The utility model is achieved in that the electric food warmer of capable of cooking congee comprises heater and the pot cover with sandwich, in the current loop of heater, be serially connected with bidirectional triode thyristor, logical as the control heater, the switch element of outage, especially, other has a bleeder circuit that is communicated with the power line of electric food warmer, bleeder circuit includes electric capacity and the thermistor that is connected in parallel at least, electric capacity that this is connected in parallel and thermistor are by a bidirectional trigger diode that is connected to the bidirectional triode thyristor control utmost point, be connected in parallel on the pair of control port of bidirectional triode thyristor, make the voltage drop on this electric capacity and thermistor become the control voltage of bidirectional triode thyristor.Have steam channel in having the pot cover of sandwich, described thermistor is arranged in this steam channel.Operation principle of the present utility model is as follows: before the congee boiling, the steam temperature of pot cover steam channel of flowing through is lower, thermistor remains at high-impedance state, flow through voltage drop that bleeder circuit produces on electric capacity and thermistor of electric current is higher than the conducting voltage of bidirectional trigger diode, make bidirectional triode thyristor be in conducting state, so the heater heating power is until congee is boiled; After congee boiling, a large amount of high-temperature vapours are from the ejection of pot cover steam channel, and the thermistor resistance reduces, and make itself and the pressure drop on the electric capacity be lower than the conducting voltage of bidirectional trigger diode, so bidirectional triode thyristor ends, heater stops to generate heat; After heater stopped heating, the vapor volume of the pot cover steam channel of flowing through reduced, temperature reduces, and the thermistor resistance in the passage returns to high-impedance state gradually, and until bidirectional triode thyristor conducting once more, heater boils congee once more.So circulation just can make the interior congee of pot intermittently seethe with excitement and not overflow.This shows that the utility model is compared with the ZL01256256.4 patent, has cancelled the moving fault temperature detector, and the operating temperature of thermistor reduces greatly, so the more reliable performance of electric food warmer, quality are more stable.

The utility model has the advantages that: owing to be not by monitoring heater temperature, but monitor fluidized state by the monitoring steam temperature, and therefore the degree of accuracy of control and stability are better, and the Shi Buhui that can guarantee to cook congee overflows, again can be congee is well-done, well-done.Operating temperature owing to thermistor greatly reduces in addition, and is therefore not high to the quality requirement of thermistor, is convenient to buying, made things convenient for the production in enormous quantities of electric food warmer.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples, wherein:

Fig. 1 is the utility model overall structure schematic diagram;

Fig. 2 is an electrical block diagram of the present utility model;

Fig. 3 is another embodiment of circuit structure of the present utility model.

The specific embodiment

Referring to Fig. 1, the electric food warmer of capable of cooking congee comprises heater 1 and the pot cover 2 with sandwich.Referring to Fig. 2, in the current loop of heater 1, be serially connected with bidirectional triode thyristor V1, by the switching electricity condition of this bidirectional triode thyristor control heater 1.Other has a bleeder circuit that is communicated with the power line of electric food warmer, bleeder circuit among Fig. 2 is made up of the two parts that are in series, wherein a part is capacitor C and the thermistor R1 that is connected in parallel, another part is a fixed resistance R2, capacitor C that is connected in parallel and thermistor R1 are by a bidirectional trigger diode V2 who is connected to the bidirectional triode thyristor V1 control utmost point, be connected in parallel on the pair of control port of bidirectional triode thyristor V1, that is be connected in parallel between the T1 and the G utmost point among Fig. 2, make the voltage drop on capacitor C and thermistor R1 become the control voltage of bidirectional triode thyristor V1.Referring to Fig. 1, in pot cover 2, have steam channel 3 with sandwich, thermistor R1 is arranged in this steam channel.The present embodiment operation principle is as follows: before the congee boiling, thermistor R1 is in high-impedance state, voltage drop on capacitor C and the thermistor R1 is higher than the conducting voltage of bidirectional trigger diode V2, makes bidirectional triode thyristor V1 conducting, so heater 1 heating power is until congee is boiled; After the congee boiling, a large amount of high-temperature vapours are from 3 ejections of pot cover steam channel, thermistor R1 reduces because of the resistance of being heated, make the pressure drop on itself and the capacitor C be lower than the conducting voltage of bidirectional trigger diode V2, bidirectional triode thyristor V1 ends, heater 1 stops heating (though still have this moment small amount of current by the bleeder circuit heater 1 of flowing through, this electric current is very little, and heater 1 generates heat hardly); After heater 1 stopped heating, the vapor volume of the pot cover steam channel 3 of flowing through reduced, temperature reduces, and the resistance of thermistor R1 returns to high-impedance state gradually, bidirectional triode thyristor V1 conducting once more, and heater 1 heating power once more boils congee.So go round and begin again and just can make the congee in the pot intermittently seethe with excitement and do not overflow.

K switch 1 among Fig. 2, magnetic steel temperature limiter K2 and small-power heater 4 are mainly in order to make electric food warmer set up with rice-cooking function.When cooking, K switch 1 makes bidirectional triode thyristor V1 ineffective bidirectional triode thyristor V1 short circuit.After poach is done, magnetic steel temperature limiter K2 tripping, small-power heater 4 is serially connected with high-power heater 1, and general power descends, and realizes heat insulation function.In fact when cooking, also K switch 1 can be disconnected, make bidirectional triode thyristor V1 still play a role, water was boiled dry under the fluidized state gradually at intermittence, can make the meal that cooks softer good to eat like this.

Embodiment shown in Figure 3 and the difference of Fig. 2 only are that the fixed resistance R2 in the bleeder circuit directly is communicated with power line.Its operation principle is the same substantially with Fig. 2, is not repeated.

As preferred forms, the cross-sectional area of the pot cover steam channel at place, thermistor R1 position is preferably in 38～79mm ²Scope in, the vapor volume of the thermistor R1 that flows through like this is optimum.

Claims

1. the electric food warmer of a capable of cooking congee, comprise heater and pot cover with sandwich, in the current loop of heater, be serially connected with bidirectional triode thyristor, it is characterized in that: other has a bleeder circuit that is communicated with the power line of electric food warmer, bleeder circuit includes electric capacity and the thermistor that is connected in parallel at least, electric capacity that this is connected in parallel and thermistor are by a bidirectional trigger diode that is connected to the bidirectional triode thyristor control utmost point, be connected in parallel on the pair of control port of bidirectional triode thyristor, have steam channel in having the pot cover of sandwich, described thermistor is arranged in this steam channel.

2. electric food warmer as claimed in claim 1 is characterized in that described bleeder circuit is made up of the two parts that are in series, and wherein a part is electric capacity and the thermistor that is connected in parallel, and another part is a fixed resistance.

3. electric food warmer as claimed in claim 1 or 2, the cross-sectional area that it is characterized in that the pot cover steam channel that the thermistor position is located is at 38～79mm ²Scope in.