CN2049058U - Electroheat apparatus with multipoint sampling and overheating protection - Google Patents
Electroheat apparatus with multipoint sampling and overheating protection Download PDFInfo
- Publication number
- CN2049058U CN2049058U CN 89202800 CN89202800U CN2049058U CN 2049058 U CN2049058 U CN 2049058U CN 89202800 CN89202800 CN 89202800 CN 89202800 U CN89202800 U CN 89202800U CN 2049058 U CN2049058 U CN 2049058U
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- temperature
- electric heating
- control switch
- temperature control
- heater
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Abstract
The utility model relates to an electrothermal apparatus with multipoint sampling and overheating protection. In the utility model, a plurality of heating positions of a heating container of the electrothermal apparatus or a plurality of heating positions of an electric heating body are provided with more than one temperature sensors to carry out the multipoint sampling and overheating protection. The utility model is provided with a specific temperature control circuit and a sensitive and reliable system for temperature control and overheating protection, which is favorable for avoiding the fault caused by the non-uniform thermal field of the heating container or the electric heating body to improve the service life of the electrothermal apparatus. For an electrothermal apparatus which has the large area of the heating body and uses an electrothermal membrane as the heating body, the design proposal of the utility model is feasible and necessary.
Description
The utility model relates to the overtemperature protection of electric heating appliance and the improvement of temperature regulating device.
Present general electric heating appliance, as electric-heating cooking utensil, general bimetal leaf or the temperature control magnet steel of adopting carries out temperature control as temperature sensor by single-point temperature-sensitive sampling mode, if thermal field skewness or electric heating appliance operating state that the electric heating appliance heater is produced make electric heating appliance heating surface thermal field skewness, will be owing to can not in time sensing some temperature anomaly point, can not produce the temperature control action and fault such as cause that electric heating appliance burns.Particularly for adopting Electric radiant Heating Film isothermal efficiency height; the fast material of self temperature rise speed is as the electric heating appliance of the electric heating element of heater; the easier overtemperature of its heater burns out; need safety and reliability that sensitive overtemperature protection system can guarantee that just electric heating appliance uses; the protection of single-point temperature-sensitive sampling temperature control is difficult to adapt to requirement; for the bigger electric heating appliance of heater area, above-mentioned problem is just more outstanding.
The purpose of this utility model is for solving a kind of new technical scheme with electric heating appliance of multidraw overtemperature protection that above-mentioned prior art problems proposes; make electric heating appliance obtain more sensitive reliable protection, be specially adapted to electric heating appliance and the bigger electric heating appliance of heater area that Electric radiant Heating Film is made heater.
Structure of the present utility model comprise heating container, electric heating body (electric heating body also can with heating container in conjunction with forming overall structure); power-supply system and shell etc.; its technical characterstic be have more than one temperature sensor or (with) overheat protector; be contained in respectively heating container some heated parts or (with) some heating positions of electric heating body, carry out multiple spot temperature-sensitive sampling overtemperature protection.
Said temperature sensor can be a PTC positive temperature coefficient temperature-sensitive element, also can be temperature-sensitive element or the temperature-sensing element in the temperature control switch; Said overheat protector can be a thermal cut-off; Said temperature control switch can adopt bimetal leaf temperature control switch, thermal relay, ferrite formula temperature control switch or infrared ray temperature-sensitive thermostat.Above-mentioned temperature sensor or overheat protector can be singly with a kind of, but also several applied in any combination, every kind of temperature sensor or overheat protector all available one or more.
Do overtemperature protection temperature sensor or (with) number of overheat protector should decide according to the shape and the size of the heating face of the heating surface of the heating container of electric heating appliance or electric heating body; usually need have more than 3 or 3 temperature sensor or (with) overheat protector carries out multiple spot temperature-sensitive sampling and just can obtain reliable sensitive overheat protector temperature-sensitive sampling point and lay according to the thermal field distribution situation of heating container heating surface or electric heating body, can obtain satisfied protection effect.
For the electric heating temperature-adjusting circuit system of general type, can be in its main circuit power supply, connect series connection mutually PTC positive temperature coefficient temperature-sensitive element or (with) the temperature control switch or (with) overheat protector; Also each PTC positive temperature coefficient temperature-sensitive element or temperature control switch or overheat protector can be connected on respectively in each parallel branch of heater, respectively each branch road heater be carried out overtemperature protection.Some heated parts that the temperature sensor of above-mentioned each PTC positive temperature coefficient temperature-sensitive element or temperature control switch and overheat protector can install to the electric heating appliance heating container or (with) some heating positions of electric heating body.
The utility model can adopt temperature control and the even more ideal electric heating temperature-controlling system of overtemperature protection effect---silicon-controlled voltage regulation temperature-controlling system; in this temperature-controlling system; can in the silicon controlled circuits for triggering, connect PTC positive temperature coefficient temperature-sensitive element or (with) bimetal leaf temperature control switch or (with) thermal relay or (with) ferrite formula temperature control switch or and infrared ray temperature-sensitive thermostat or (with) thermal cut-off equitemperature transducer or temperature control switch or overheat protector; PTC positive temperature coefficient temperature-sensitive element; the temperature sensor of thermal cut-off and each temperature control switch can install to electric heating appliance heating container some suitable heated part or (with) the some suitable heating position of electric heating body; this is main overheat protector; in main overheat protector; PTC positive temperature coefficient temperature-sensitive element or (with) the temperature control switch or (with) thermal cut-off etc. can pass through multiple usual manner being connected in thyristor gating circuit; when the PTC positive temperature coefficient element sharply being raise because of overheated resistance with realization; or because of overheated when making the fusing of temperature control switch motion or thermal cut-off; thyristor gating circuit can turn-off controllable silicon and reduce the silicon controlled angle of flow with power supply or the regulation and control of cutting off major loop; reduction makes the electric heating body of electric heating appliance obtain overtemperature protection to the input power of major loop.Simultaneously, in its current supply circuit, also can connect several temperature control switch or overheat protectors by the method for the electric heating temperature-controlling system of above-mentioned general type, this is auxiliary overheat protector.But main overheat protector and auxiliary overheat protector fit applications also can be used separately.
Temperature-adjusting circuit of the present utility model can adopt the bidirectional triode thyristor AC voltage adjusting circuit.
In temperature-adjusting circuit of the present utility model, as in the PTC positive temperature coefficient temperature-sensitive element or temperature control switch of overtemperature protection, can be at least with a double as temperature regulator.
Usually suitable overtemperature protection temperature is selected in requirement that can be specific to overtemperature protection according to the heater that electric heating appliance adopted, and promptly temperature sensor or overheat protector produce the temperature of overtemperature protection reaction.Usually can be chosen between 90 ℃～300 ℃.
The utility model adopts multiple spot temperature-sensitive sampling overtemperature protection; can in a big way, react the temperature anomaly of the heating face of the heating surface of heating container of electric heating appliance or electric heating body more delicately; and carry out overtemperature protection; the not too even or bigger electric heating appliance of heater area for thermal field; overtemperature protection is in time sensitive; can improve the useful life of electric heating appliance greatly; the utility model not only adapts to general heating wire; the heater of electric heating tubular type; also be adapted to carbon fiber; the heater of graphite fibre formula; for heat efficiency height; the fast electrothermal membrane type heater of self temperature rise; the overtemperature protection mode that the utility model provides is important especially, or even requisite.The utility model is applicable to makes various electric heating appliances that family and collective use as electric rice cooker, electric frying pan, electric chafing dish, electric oven, electric water-boiling device, electric heater etc., also can be used for making various electric drying ovens, electric heating appliances such as electricity sterilization stove.
Embodiment below in conjunction with a concrete electric rice cooker design of description of drawings the utility model.
Fig. 1 is the structure diagram of electric rice cooker;
Fig. 2 is the distribution schematic diagram of temperature sensor on electric heating body (electrothermal film heater);
Fig. 3 is the electric heating temperature-controlling system circuit diagram of electric rice cooker;
Fig. 4 is the circuit diagram of another kind of electric heating temperature-controlling system.
This electric rice cooker comprises pot cover (1) and pot body (2) (composition heating container), electrothermal film type electric heating body (4, R) invests the bottom surface of a pot body (2) and is combined into one with it, be separated with one deck dielectric film (3) between pot body (2) and the Electric radiant Heating Film, the electric heating temperature-adjusting circuit adopts the bidirectional triode thyristor AC voltage adjusting circuit.Circuits for triggering with bidirectional triode thyristor 3CTS, 3CTS adopt the bidirectional diode circuits for triggering, comprise bidirectional diode 2CTS, capacitor C, resistance R
1The strip resistance of using with rate of doing work adjuster is divided the variable resistor R of position switch
3, play the PTC positive temperature coefficient temperature-sensitive element R that overtemperature protection is used
3With four bimetal leaf temperature control switch (T
1～T
4) be connected in the circuits for triggering; the temperature sensor of PTC positive temperature coefficient temperature-sensitive element and four bimetal leaf temperature control switches is attached to the heating face of electric heating body with spring (7) top across one deck mica insulation sheet (5) and temperature-sensitive heat transfer copper foil (6); its position can be laid by Fig. 2; the centre is a PTC positive temperature coefficient temperature-sensitive element; the even temperature sensor of uniform four bimetal leaf temperature control switches all around; the temperature characterisitic of PTC positive temperature coefficient temperature-sensitive element; pairing temperature can be chosen between 120 ℃～150 ℃ when its resistance sharply increased; it had both played superheat protecting function; when steamed rice, also play regulating and controlling temperature; when meal is ripe; PTC positive temperature coefficient temperature-sensitive element resistance value can be increased sharply, and reduces the angle of flow of bidirectional triode thyristor greatly or turn-offs bidirectional triode thyristor.The temperature that bimetal leaf temperature control switch plays overtemperature protection can be chosen between 150 ℃～170 ℃.During the work of this electric heating temperature-controlling system, R
1, R
2, R
3Form the RC loop with C, make 2CTS produce trigger impulse, control bidirectional triode thyristor 3CTS conducting under certain angle of flow makes heater (4, R) obtain heating power, changes R
2Resistance value (gearshift) (regulating) by hand regulator (11); can change the angle of flow of 3TCS; change and supply with heater (4; R) power; when reaching cooking temp; PTC positive temperature coefficient temperature-sensitive element resistance value will sharply raise; reduce the angle of flow of 3CTS greatly or turn-off 3CTS; the power of supplying with heater is reduced greatly or end; reach overtemperature as the undesired certain heater that makes of electric food warmer work; arrived by PTC temperature-sensitive element or bimetal leaf temperature control switch senses; controllable temperature is turn-offed; circuit stops the heater power supply, thereby electric heating appliance is protected, and (8) are shell among the figure; (9) be supply socket, (10) are temperature control circuit box.
Fig. 4 is another kind of electric heating temperature-adjusting circuit form, and wherein the PTC temperature-sensitive element is connected in the silicon controlled circuits for triggering, and bimetal leaf temperature control switch series is received in the main circuit power supply.
Claims (6)
1, a kind of electric heating appliance that comprises that heating container, electric heating body, power-supply system and shell are formed; it is characterized in that in the electric heating temperature-controlling system of this electric heating appliance; have more than one temperature sensor or (with) overheat protector; be contained in respectively heating container some heated parts or (with) some heating positions of electric heating body, carry out the multidraw overtemperature protection.
2, by the described electric heating appliance of claim 1, it is characterized in that in the electric heating temperature-controlling system temperature sensor or (with) overheat protector is more than 3 or 3.
3, by the described electric heating appliance of claim 1; it is characterized in that said temperature sensor is temperature-sensitive element or the temperature-sensing element in PTC positive temperature coefficient temperature-sensitive element, the temperature control switch, said overheat protector is a thermal cut-off.
4, by the described electric heating appliance of claim 3, it is characterized in that said temperature control switch is bimetal leaf temperature control switch or thermal relay or ferrite formula temperature control switch or infrared ray temperature-sensitive thermostat.
5, by claim 1 or 3 or 4 described electric heating appliances; it is characterized in that can with rise overtemperature protection PTC positive temperature coefficient temperature-sensitive element or (with) the temperature control switch or (with) overheat protector connects mutually and is connected in the main circuit power supply; when major loop has many groups heater in parallel; PTC positive temperature coefficient temperature-sensitive element or temperature control switch or overheat protector also can be connected on respectively in each parallel branch of heater, respectively each branch road heater are carried out overtemperature protection.
6, by claim 1 or 3 or 4 described electric heating appliances; it is characterized in that the electric heating temperature-controlling system adopts the silicon-controlled voltage regulation temperature-controlling system; rise superheat protecting function PTC positive temperature coefficient temperature-sensitive element or (with) the temperature control switch or (with) overheat protector is connected in the silicon controlled circuits for triggering, wherein can be at least with a PTC positive temperature coefficient temperature-sensitive element or (with) temperature control switch double as temperature regulator.
By the described electric heating appliance of claim 1, it is characterized in that it is the electric heating appliance of heater that said electric heating temperature-controlling system is fit to heating wire or electrothermal tube or graphite fibre or carbon fiber, being particularly suitable for the Electric radiant Heating Film is the electric heating appliance of heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89202800 CN2049058U (en) | 1989-03-10 | 1989-03-10 | Electroheat apparatus with multipoint sampling and overheating protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89202800 CN2049058U (en) | 1989-03-10 | 1989-03-10 | Electroheat apparatus with multipoint sampling and overheating protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2049058U true CN2049058U (en) | 1989-12-06 |
Family
ID=4860477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89202800 Withdrawn CN2049058U (en) | 1989-03-10 | 1989-03-10 | Electroheat apparatus with multipoint sampling and overheating protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2049058U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111938290A (en) * | 2020-07-29 | 2020-11-17 | 珠海格力电器股份有限公司 | Superoxide fresh-keeping device and application |
-
1989
- 1989-03-10 CN CN 89202800 patent/CN2049058U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111938290A (en) * | 2020-07-29 | 2020-11-17 | 珠海格力电器股份有限公司 | Superoxide fresh-keeping device and application |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |