CN2901764Y - Electric heater with self protective function - Google Patents
Electric heater with self protective function Download PDFInfo
- Publication number
- CN2901764Y CN2901764Y CN200620095970.5U CN200620095970U CN2901764Y CN 2901764 Y CN2901764 Y CN 2901764Y CN 200620095970 U CN200620095970 U CN 200620095970U CN 2901764 Y CN2901764 Y CN 2901764Y
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- CN
- China
- Prior art keywords
- heating elements
- electrical heating
- overtemperature protection
- contact
- electric heater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Fuses (AREA)
Abstract
The utility model is an electric heating device with the function of self-protection, mainly consisted by electric heating elements and overtemperature protection elements. The model protects itself by overtemperature protection elements made from the principle that bimetallic strips are out of shape when heated, the overtemperature protection elements will cut off the power when the electric heating elements are overheat, and the overtemperature protection elements will reset automatically when the temperature return to normal. The utility model has double functions of heating and self-protection.
Description
Technical field
The utility model relates to a kind of electric heater unit that has self protective function, and this device has heating and self-protection dual-use function.
Background technology
The effect of electrical heating elements is to utilize the thermal effect of electric current to produce heat, heats to liquid by the conduction of heat then.Electrical heating elements commonly used has U-shaped tubular type, helix tube type, board-like, belt, disc type etc.Their mode of heating is divided into two kinds of direct heating and indirect.Directly heating is directly put into heated liquid with heating element exactly, and indirect is that heater element heats to container, then by the conduction of heat, the temperature that is heated liquid is raise.When the liquid level of the liquid of depositing in the container was lower than normal value and exhausts even, the temperature of electrical heating elements sharply rose, " dry combustion method " phenomenon that Here it is it has often been said.If lack protection, can cause the damage of electrical heating elements, and cause corresponding security incident.
Had in the past and use the overtemperature protection of thermal cut-off, but thermal cut-off self is irreversible, has finished once and must carry out maintain and replace after the protection as heating element.
Summary of the invention
The utility model provides a kind of electric heater unit that has self protective function at above-mentioned phenomenon.The self-protection function is meant in the equipment that has used electrical heating elements; because of operate miss or improper use; when causing the temperature of electrical heating elements sharply to rise; the action of overtemperature protection element; prevent the damage of electrical heating elements; the security incident that improves the useful life of electrical heating elements and prevent to cause thus.This device is when after the temperature of electrical heating elements is normal, and the overtemperature protection element automatically resets, and electrical heating elements can recover operate as normal.
The technical scheme that has the electric heater unit employing of self protective function is: device mainly is made of electrical heating elements and overtemperature protection element, and electrical heating elements is connected with the overtemperature protection element by screw rod, nut.The bimetal leaf that strain can take place with variation of temperature is housed on the electrical heating elements; by bimetal leaf and two fixed contacts (one for movingly open, one close for moving) form the overtemperature protection element; when the temperature of electrical heating elements surpasses normal value; the state of contact changes; cut off the power supply of electrical heating elements, thereby reach the purpose of protection.Heating element can adopt U-shaped tubular type, helix tube type, board-like, belt, disc type etc.
Description of drawings
Be that example describes the utility model with U-shaped pipe electrical heating elements below.
Fig. 1 is the U-shaped pipe electric heater unit structure of band self protective function.
Fig. 2 directly uses contact triggered circuit theory diagrams.
Fig. 3 uses contact triggered circuit theory diagrams indirectly.
1. make contact among the figure, 2. moving contact, 3. bimetal leaf, 4. screw rod, 5. nut, 6.U shape electrical heating elements shell, 7. insulating washer, 8. moving contact, 9. electrical heating elements, 10. moving contact, 11. electrical heating elements, 12. transformers, 13. make contact, 14. contactor coils opened of contactor opened opened
Embodiment
Device mainly is made of electrical heating elements and overtemperature protection element, and electrical heating elements is connected with the overtemperature protection element by screw rod, nut.The bimetal leaf that strain can take place with variation of temperature is housed on the electrical heating elements; by bimetal leaf and two fixed contacts (one for movingly open, one close for moving) form the overtemperature protection element; when the temperature of electrical heating elements surpasses normal value; the state of contact changes; cut off the power supply of electrical heating elements, thereby reach the purpose of protection.Heating element can adopt U-shaped tubular type, helix tube type, board-like, belt, disc type etc.
One end of bimetal leaf 3 is fixed on the electrical heating elements shell 6 by screw rod 4, nut 5, keeps insulation with electrical heating elements.The other end is equipped with the contact, and they form the moving contact of overtemperature protection element.Moving open contact 2, make contact 1 is fixed on the electrical heating elements shell 6 equally, between them and and heating element between all keep insulation.Thermel protection device is installed in the compact conformation that both can make product on the electrical heating elements, also makes bimetal leaf 3 can promptly experience the variations in temperature of electrical heating elements.When the temperature of electrical heating elements surpasses just often, the bimetal leaf action is movingly opened contact 2 and is become disconnection by original closure, and make contact 1 becomes closure by original disconnection.
The mode of heating of electrical heating elements is divided into two kinds, and a kind of is direct heating, electrical heating elements be heated object and directly contact; Another kind is an indirect, and electrical heating elements heats to container, then heat is conducted to being heated object.
When using electrical heating elements indirect or heating power supply as safe voltage, can directly seal in the heater circuit moving open contact 2, utilize moving the opening, breaking of contact 2 control heating power supplies of opening.Fig. 2 is the moving directly basic circuit diagram of use of contact 2 of opening.Make contact 1 can be on the shelf, also can be used as the switch of sound, light warning, to show prompting.The operation principle of circuit is: when having served as the thermal protective element action, the moving contact 8 of opening disconnects, and cuts off the power supply of electrical heating elements.
When directly mode of heating, and heating power supply is non-safe voltage, consider that heated liquid has certain conductivity; consideration for secure context; opening, breaking of electrical heating elements power supply for example with relay contact control, controlled indirectly in necessary contact of using the overtemperature protection element indirectly.Fig. 3 is the basic circuit diagram that uses make contact 1 indirectly.The operation principle of circuit is: when having served as the thermal protective element action, and make contact 13 closures, contactor coil 14 gets electric, and the moving contact 10 of opening of contactor disconnects electrical heating elements 11 outages.Transformer plays a part to isolate and transformation in circuit.
Claims (2)
1, a kind of electric heater unit that has self protective function; mainly constitute by electrical heating elements and overtemperature protection element; electrical heating elements is connected with the overtemperature protection element by screw rod, nut, it is characterized in that: be equipped with by bimetal leaf on the electrical heating elements and move and open the overtemperature protection element that contact, make contact are formed.
2, a kind of electric heater unit that has self protective function according to claim 1 is characterized in that: electrical heating elements adopts U-shaped tubular type, helix tube type, board-like, belt, disc type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200620095970.5U CN2901764Y (en) | 2006-04-03 | 2006-04-03 | Electric heater with self protective function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200620095970.5U CN2901764Y (en) | 2006-04-03 | 2006-04-03 | Electric heater with self protective function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2901764Y true CN2901764Y (en) | 2007-05-16 |
Family
ID=38085927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200620095970.5U Expired - Fee Related CN2901764Y (en) | 2006-04-03 | 2006-04-03 | Electric heater with self protective function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2901764Y (en) |
-
2006
- 2006-04-03 CN CN200620095970.5U patent/CN2901764Y/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 | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070516 Termination date: 20100403 |