CN2817670Y

CN2817670Y - Electric heating pan

Info

Publication number: CN2817670Y
Application number: CN 200520063457
Authority: CN
Inventors: 冯敏
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-08-17
Filing date: 2005-08-17
Publication date: 2006-09-20
Anticipated expiration: 2015-08-17

Abstract

The utility model relates to an electric heating pan which comprises a pan body and a pan cover, wherein an electric heating element is arranged in the pan body, and a steam discharging passage is arranged in the pan cover. The utility model is mainly characterized in that a current loop of the electric heating element is connected with a mechanical motion-off type temperature sensing switch with double metal sheets in series, and the temperature sensing switch is placed in the steam discharging passage of the pan cover. The type of a temperature sensing element is selected in an optimum mode, the installation position of the temperature sensing element is designed in an optimum mode, and the temperature sensing element with low price and a simple control circuit are utilized; thus, the utility model solves the boiling overflow problem of the electric heating pan.

Description

Electric food warmer

Technical field

The utility model relates to a kind of electric heating appliance for cooking, particularly to steam, to boil the electric food warmer as main cooking function.

Background technology

Be mainly used in steaming, boil the electric food warmer of function, for example the food boiling in cooking process such as it is being cooked congee, Baoshang, often takes place and overflows in electric cooker (claiming electric cooker again) easily.For addressing this problem, several solutions below main at present the employing, a kind of is that heating with electric food warmer is divided into different two groups of power, before the food boiling, heat with the large power, electrically thermal element, after the food boiling, the outage of large power, electrically thermal element, replace the small power electric thermal element and continue heating, in the hope of keeping food at slight fluidized state, it is bigger that this control mode is influenced by supply voltage, is easy to take place boiling when voltage is higher and overflows; Another kind of scheme is to adopt single-chip microcomputer to carry out fuzzy control, but its circuit complexity, the production cost of electric food warmer and price are all higher, are not suitable for the lower product of price positioning; Also having a kind of scheme is the mode that adopts temperature-sensing element to cooperate with controllable silicon, utilize the silicon controlled on-off action to make heating be in the duty of intermittently power-on, this electric food warmer can solve the problem that boiling is overflowed well, and cost also is lower than the electric food warmer that adopts single-chip microcomputer, but silicon controlled cost wherein, the cost of high-power silicon controlled rectifier particularly, mechanical double sheet metal temperature detector than routine is still higher, and therefore this electric food warmer still is not suitable for the cheap product of price positioning.

Summary of the invention

The purpose of this utility model provides a kind of simple control circuit and cheap element of adopting, and just can solve the electric food warmer of boiling overflow problem well.

The utility model is achieved in that a kind of electric food warmer, comprise pot body and pot cover, in the pot body, be provided with heating, on pot cover, offer the discharge of steam passage, especially, in the current loop of heating, be in series with mechanical type moving fault bimetal leaf temperature sensitive switch, and this temperature sensitive switch is placed in the discharge of steam passage of pot cover.The utility model utilization is placed on the fluidized state that the interior temperature sensitive switch of pot cover discharge of steam passage is monitored food, when food fully seethes with excitement and is about to overflow, the steam that flows through passage makes the temperature in the passage obviously raise, impel the temperature sensitive switch action, cut off the current loop of heating, slow down and work as food boiling degree, the quantity of steam that flows through passage reduces, after being directed at the temperature decline in the passage, temperature sensitive switch will recover normally off, reclose the current loop of heating, make food not only remain on fluidized state but also can not overflow.Therefore the utility model can solve the problem that the food boiling is overflowed well.On the other hand, the used temperature sensitive switch of the utility model is a mechanical type moving fault bimetal leaf temperature sensitive switch, and this is a kind of temperature-sensing element of routine, and price is more much lower than the controllable silicon with same nominal current value.This shows that the utility model utilizes the temperature-sensing element and the simple control circuit of a cheapness by the type of preferred temperature-sensing element and the installation site of optimal design temperature-sensing element, has just solved the boiling overflow problem of electric food warmer well.

The utility model has the advantages that to be highly suitable for the cheap product of price positioning, make cheap electric food warmer also can realize the function that the food boiling is overflowed that prevents that present high-grade electric food warmer just has, can finish well cook congee, cooking function such as Baoshang.

Description of drawings

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

Fig. 2 is circuit theory embodiment of the present utility model.

The specific embodiment

Referring to Fig. 1, electric food warmer comprises pot body 1 and pot cover 2.In the pot body, be provided with heating 3.Heating 3 can be conventional devices such as electric hot tray, electrothermal tube.On pot cover 2, offer discharge of steam passage 4.Referring to circuit theory diagrams shown in Figure 2, in the current loop of heating 3, be in series with mechanical type moving fault bimetal leaf temperature sensitive switch 5.Temperature sensitive switch 5 is placed in the pot cover discharge of steam passage 4 shown in Figure 1.When food fully seethed with excitement and is about to overflow, the temperature that the quantity of steam that flows through passage 4 obviously increases, passage is interior significantly rose, and impelled temperature sensitive switch 5 actions, cut off the current loop of heating 3; Slow down when food boiling degree, after the quantity of steam that flows through passage 4 descended, temperature sensitive switch 5 reclosed the circuit loop of heating 3, makes food not only remain on fluidized state but also can not overflow.

The shape of cross section of discharge of steam passage 4 can be circular, square, and perhaps other are irregularly shaped, and passage air inlet 4a both can be one also can be a plurality of.As embodiment preferably, total cross-sectional area of passage air inlet 4a should 〉=12 square millimeters, and≤150 square millimeters, that is regardless of shape and the quantity of passage air inlet 4a, the I of total cross-sectional area of air inlet 4a is designed to 12 square millimeters, and maximum can be designed to 150 square millimeters.The design of air inlet 4a cross-sectional area is in this scope, can make temperature in the passage 4 follow the variation of steam flow significantly and change, that is follow boiling degree change and changing significantly, guarantee that temperature sensitive switch 5 can in time move when overflowing in that food is at a simmer, after the boiling degree weakens, can in time recover on-state, and seethe with excitement at food but fully can not move too early in the boiling as yet.As preferred plan, total cross-sectional area of passage air inlet 4a should drop on 〉=and 36 square millimeters, and in≤80 square millimeters the scope, in this scope, can make temperature in the passage 4 follow the boiling degree change the most significantly and change, and can be applicable to generally that power bracket is at 0.3～3 kilowatt electric food warmer.

Circuit theory diagrams shown in Figure 2 have only adopted a heating 3, have adopted the electric food warmer of a plurality of heatings for some, and temperature sensitive switch 5 is preferably connected with the prominent heating in this electric food warmer.She Ji advantage is to control the fluidized state of food rapidly like this.

Among the embodiment shown in Figure 2, on temperature sensitive switch 5, also be parallel with indicator lamp 6.After heating 3 outages, indicator lamp 6 is luminous, indicates the attaching plug of electric food warmer still to be connected with power supply with this.The resistance 7 of connecting with indicator lamp 6 plays metering function.

Whether effective, as shown in Figure 2 hand switch 8 in parallel on temperature sensitive switch 5 for ease of the boiling protection that electric food warmer is set flexibly if overflowing function.When hand switch 8 closures, temperature sensitive switch 5 is by short circuit, and the boiling protection that has equaled to cancel electric food warmer overflows function, is convenient to the user thus and selects flexibly.

Aforementioned NM other elements among Fig. 2 have constituted the electric food warmer with rice-cooking function of a routine, and related operation principle and the utility model do not have direct relation.

Though the purpose of this utility model is to solve the boiling overflow problem of electric food warmer with simple control circuit and cheap element, but as long as increase other miscellaneous functions on this basis, for example increase timer, increase temperature indicator etc., still can constitute the electric food warmer of a top grade.

Claims

1, a kind of electric food warmer, comprise pot body and pot cover, in the pot body, be provided with heating, on pot cover, offer the discharge of steam passage, it is characterized in that: in the current loop of heating, be in series with mechanical type moving fault bimetal leaf temperature sensitive switch, and this temperature sensitive switch is placed in the discharge of steam passage of pot cover.

2, electric food warmer as claimed in claim 1 is characterized in that: total cross-sectional area 〉=12 of the air inlet of pot cover discharge of steam passage square millimeter ,≤150 square millimeters.

3, electric food warmer as claimed in claim 2 is characterized in that: total cross-sectional area 〉=36 of the air inlet of pot cover discharge of steam passage square millimeter, and≤80 square millimeters.

4, electric food warmer as claimed in claim 1 is characterized in that: described heating of connecting with temperature sensitive switch is a prominent heating in this electric food warmer.

5, electric food warmer as claimed in claim 1 is characterized in that: be parallel with indicator lamp on described temperature sensitive switch.

6, electric food warmer as claimed in claim 1 is characterized in that: be parallel with hand switch on described temperature sensitive switch.