CN2593513Y - Electric heater with automatic current-limit and temperature-limiting function - Google Patents
Electric heater with automatic current-limit and temperature-limiting function Download PDFInfo
- Publication number
- CN2593513Y CN2593513Y CN 02250646 CN02250646U CN2593513Y CN 2593513 Y CN2593513 Y CN 2593513Y CN 02250646 CN02250646 CN 02250646 CN 02250646 U CN02250646 U CN 02250646U CN 2593513 Y CN2593513 Y CN 2593513Y
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- China
- Prior art keywords
- heater
- temperature
- limit temperature
- limit
- current limiting
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- Expired - Fee Related
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Abstract
The utility model relates to an electric heater with automatic current limiting and temperature limiting functions. The heater is provided with a base 10 in which three independent cavities 11, 12 and 13 are arranged, a heating element 20, a current limiting and temperature limiting element 30 and thermoregulation filling materials 40 are respectively installed in the three cavities, wherein the heating element and the current limiting and temperature limiting element are connected with conducting wires 50, and insulation layers 21 and 31 are respectively arranged between the heating element and the inner wall of the base and between the current limiting and temperature limiting element and the inner wall of the base. The utility model can limit the maximum current of the heater and can prevent overtemperature, and has the advantages of safe and reliable use and low cost.
Description
Technical field
The utility model relates to electric heating device, particularly relates to a kind of thermoelectric heating device with automatic current limiting and limit temperature function that is widely used in all kinds of household appliances.
Background technology
Present multiple electric heating household electrical equipment is in the life as extensive use people such as electric heater, small electrical cooker, curler etc.The heater element that these class household electrical appliance adopted mainly comprises resistance wire, electrothermal tube, Electric radiant Heating Film etc., these heater elements do not have the automatic constant-temperature function, can only under certain thermal capacity condition, design its heat balance power, in case environmental condition or thermal capacity change, its temperature will sharply rise, and the member of fusion household appliances, cause the generation of security incident.For this reason, general electric heating household electrical appliances all are provided with Thermal Cutoffs, temperature switch or current relay, but this type of protective device all exists operation precision low, phenomenons such as electric contact when outage scintillation, thereby be not suitable for the occasion that inflammable gas is arranged.Simultaneously, this class device also exists installs trouble, cost height, defective such as the life-span is short, and maintenance load is big.For overcoming above-mentioned defective, some heating element has also adopted positive temperature coefficient (PTC) heater element, this heater element band automatic constant-temperature function, but steady-state current and heat balance power consumption during its constant temperature are bigger.Simultaneously, the temperature of automatic constant-temperature is far above the working temperature of household electrical appliance setting., the material of household appliances is had higher requirements, this must increase product cost for this reason.For avoiding overtemperature, this class heating element must be joined temperature protection switch in addition, thereby also has the problems referred to above.
Summary of the invention
The utility model is intended to address the above problem, and can limit maximum current and prevent overtemperature and provide a kind of, the thermoelectric heating device with automatic current limiting and limit temperature function safe and reliable and with low cost.
For achieving the above object, the utility model provides a kind of thermoelectric heating device with automatic current limiting and limit temperature function, this heating element has a pedestal 10, heater 20, current limliting, limit temperature element 30 and the temperature adjustment packing material 40 of mutual isolation are housed in the pedestal, and wherein heater and current limliting, limit temperature element are connected with lead 50.
Pedestal 10 is bar, bulk, be provided with three independently cavitys 11,12,13 in the pedestal, heater 20, current limliting, limit temperature element 30 and temperature adjustment packing material 40 are housed respectively in three cavitys, and are respectively equipped with insulating barrier 21,31 between heater and current limliting, limit temperature element and the base internal wall.
Heater 20 can be positive temperature coefficient semiconductor heating pottery, resistance wire, electric heating piece, Electric radiant Heating Film or electrothermal tube.
Current limliting, the warm element 30 of limit are positive temperature coefficient thermistor.
Temperature adjustment packing material 40 is asbestos, alumina silicate fibre and heat-preservation cotton.
Good effect of the present utility model is that it has effectively overcome the defective of existing heater element, has significantly improved the security performance of heating element.Compared with prior art, the utlity model has following distinguishing feature:
One, the utility model can volitional check the maximum current of heating element, the excessive security incident that produces of electric current when preventing product, and produce the electric spark phenomenon can not produce similar temperature switch tripping operation the time because of short circuit, the protection action is safety quick reliably;
Two, the utility model owing to be provided with current limliting, the warm element of limit has automatic limit temperature function, in case overtemperature can reduce load current automatically and places restrictions on temperature rise, prevent because overtemperature and generation accident;
Three, the utility model can be after cutting off electric current the function of use of restorer automatically, and need not keep in repair, thereby not have maintenance cost, and safe and reliable.
Four, operating temperature of the present utility model is far below the thermostat temperature of positive temperature coefficient heating element, and temperature control is accurate, and can turn down the heatproof requirement of household appliances plastic cement member, saves cost;
Five, the steady-state current during the PTC heating element constant temperature of no current limliting, limit temperature effect is at the hundreds of milliampere, and steady-state current of the present utility model has only tens milliamperes, and is therefore low in energy consumption, has energy-saving effect.
Description of drawings
Fig. 1 is the utility model structure cutaway view.
Embodiment
Consult Fig. 1, the pedestal 10 that thermoelectric heating device with automatic current limiting and limit temperature function of the present utility model has a metal or nonmetallic materials to make, this pedestal can be the strip or the blocks of multiple shape, it in this example rectangle strip body, be provided with three independently cavitys 11 in the pedestal, 12,13, in three cavitys heater 20 is housed respectively, current limliting, limit warm element 30 and temperature adjustment packing material 40, described heater 20 can be positive temperature coefficient (PTC) semiconductor heating pottery, resistance wire, electric heating piece, Electric radiant Heating Film or electrothermal tube, heater adopts positive temperature coefficient (PTC) semiconductor heating pottery in this example, is separated by insulating barrier 21 between this heater and the base internal wall.Described current limliting, the warm element 30 of limit adopt positive temperature coefficient thermistor, separate by insulating barrier 31 between it and pedestal, this element has automatic current limiting, limit temperature function, this be since when heater unusually and electric current when excessive, current limliting, the warm element of limit can enter high-impedance state automatically, the basic required operating current of heater that cuts off descends the heating object temperature, prevents because of big electric current generation accident.When heating element work overtemperature, this current limliting, the warm element of limit also enter high-impedance state, prevent that heating element from continuing heating.Described temperature adjustment packing material 40 can adopt asbestos, alumina silicate fibre and the heat-preservation cotton etc. with different thermal conductivity, adopts alumina silicate fibre in this example, and this material is used to regulate the controlling temperature that rises of heating element.Heater and current limliting, limit temperature element are connected with lead 50, and the lead two ends are drawn by the heating element two ends, are used for external power supply.
Claims (5)
1, a kind of thermoelectric heating device with automatic current limiting and limit temperature function, it is characterized in that, it has a pedestal (10), heater (20), current limliting, limit temperature element (30) and the temperature adjustment packing material (40) of mutual isolation are housed in the pedestal, and wherein heater and current limliting, limit temperature element are connected with lead (50).
2, the thermoelectric heating device with automatic current limiting and limit temperature function according to claim 1, it is characterized in that, described pedestal (10) is bar, bulk, be provided with three independently cavity (11), (12), (13) in the pedestal, heater (20), current limliting, limit temperature element (30) and temperature adjustment packing material (40) are housed respectively in three cavitys, and are respectively equipped with insulating barrier (21), (31) between heater and current limliting, limit temperature element and the base internal wall.
3, the thermoelectric heating device with automatic current limiting and limit temperature function according to claim 1 is characterized in that, described heater (20) can be positive temperature coefficient semiconductor heating pottery, resistance wire, electric heating piece, Electric radiant Heating Film or electrothermal tube.
4, the thermoelectric heating device with automatic current limiting and limit temperature function according to claim 1 is characterized in that, described current limliting, to limit warm element (30) be positive temperature coefficient thermistor.
5, the thermoelectric heating device with automatic current limiting and limit temperature function according to claim 1 is characterized in that described temperature adjustment packing material (40) is asbestos, alumina silicate fibre and heat-preservation cotton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02250646 CN2593513Y (en) | 2002-12-23 | 2002-12-23 | Electric heater with automatic current-limit and temperature-limiting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02250646 CN2593513Y (en) | 2002-12-23 | 2002-12-23 | Electric heater with automatic current-limit and temperature-limiting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2593513Y true CN2593513Y (en) | 2003-12-17 |
Family
ID=33720811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02250646 Expired - Fee Related CN2593513Y (en) | 2002-12-23 | 2002-12-23 | Electric heater with automatic current-limit and temperature-limiting function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2593513Y (en) |
-
2002
- 2002-12-23 CN CN 02250646 patent/CN2593513Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |