CN201256455Y - Long life type electric heating element - Google Patents
Long life type electric heating element Download PDFInfo
- Publication number
- CN201256455Y CN201256455Y CNU2008201870134U CN200820187013U CN201256455Y CN 201256455 Y CN201256455 Y CN 201256455Y CN U2008201870134 U CNU2008201870134 U CN U2008201870134U CN 200820187013 U CN200820187013 U CN 200820187013U CN 201256455 Y CN201256455 Y CN 201256455Y
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- shaped end
- heating wire
- electric heating
- heating element
- long
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Abstract
The utility model relates to a long-life electric heating element which belongs to electric heating technology field, and comprises a U-shaped metal tube whose both casing ends are fixed with high temperature resistant porcelain accessories, wherein a wire rod interpenetrates into the high temperature resistant porcelain accessories, and the inner ends of the wire rod are respectively electrically connected with two ends of an electric-heat wire. The improvement of the long-life electrictric-heat wire is composed of at least three sections whose surface loads are respectively high, middle and low, wherein the resistivity of an electric-heat wire section near a U-shaped end is less than the resistivity of an electric-heat wire section far away from the U-shaped end, in this way, the heat quantity of the electric heating element near the U-shaped end can be lowered according to needs, and disadvantage factors caused by overhigh work environment temperature are complemented, thereby the 'tube explosion' phenomenon can be effectively prevented, and the aim of prolonging the life time thereof is achieved.
Description
Technical field
The utility model relates to a kind of electrothermal device, and especially a kind of long-life type electric heating element belongs to the electric-heating technology field.
Background technology
Understand according to the applicant, existing electric heating element as shown in Figure 1, heating wire 4, wire rod 3, high temperature resistant porcelain spare 2 are packed in the metal tube shell 5 according to the order of sequence, pour into the electric-melting magnesium powder again, make heating wire by the magnesium powder center that wraps in tightly.This type of electric heating element curves U-shaped usually.During use, behind heat exchanger that it is packed into, the ambient temperature of its U-shaped end is far above the other end away from the U-shaped end, and the heating of electrothermal part is uniformly, and heat load is 2.5W/cm usually
2, therefore be unfavorable for improving heat exchanger effectiveness, also make the hot operation position of electric heating element " bombing " phenomenon occur easily.
The utility model content
The purpose of this utility model is: at the shortcoming that above-mentioned prior art exists, propose a kind of long-life type electric heating element that can effectively avoid the hot operation position " bombing " phenomenon to occur.
In order to reach above purpose, the utility model long-life type electric heating element contains U-shaped metal tube shell, high temperature resistant porcelain spare is fixed at described metal tube shell two ends, interspersed wire rod in the described high temperature resistant porcelain spare, the inner of described wire rod is electrically connected with the two ends of heating wire respectively, its improvements are: described heating wire constitutes by three sections, and wherein the heating wire section resistivity of contiguous U-shaped end is less than the heating wire resistivity away from the U-shaped end.
The frame mode of specific implementation resistivity conversion can adopt the helical form heating wire to realize, pitch, and the heating wire pitch of its contiguous U-shaped end is greater than the heating wire pitch away from the U-shaped end; Also can adopt the resistivity silk of different-diameter to realize that the heating wire diameter of its contiguous U-shaped end also can adopt such as alternate manners such as unlike material heating wire greater than the heating wire diameter away from the U-shaped end.
Like this, can reduce near the caloric value of electric heating element U-shaped end as required, replenish the too high unfavorable factor that causes of its operating ambient temperature, thereby effectively avoid " bombing " phenomenon occurring, reach the purpose that prolongs its useful life.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is the structural representation of existing electric heating element.
Fig. 2 is the structural representation of an embodiment of the utility model.
Embodiment
Embodiment one
The long-life type electric heating element of present embodiment as shown in Figure 2, high temperature resistant porcelain spare is fixed at two ends in the metal tube shell 5 as prior art, wherein interts wire rod 3.The inner of wire rod is electrically connected with the two ends of helical form heating wire 4 respectively with clamp structure.This heating wire is in series by plurality of sections.Straightway pitch away from the U-shaped end is less, has only the 2-3 millimeter, so resistivity is bigger, and heat load is 3.5W/cm
2, and near the pitch the U-shaped end is increased to 6 millimeters gradually, and resistivity diminishes gradually, and heat load is reduced to 1.5W/cm
2
Like this, the electric heating element of present embodiment is packed into behind the heat exchanger, and the caloric value of low-temperature space improves, and the caloric value of high-temperature region reduces, and therefore not only helps improving heat exchange efficiency, and prolong 2-3 doubly than original useful life.
In addition to the implementation, the utility model can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of the utility model requirement.
Claims (4)
1. long-life type electric heating element, contain U-shaped metal tube shell, high temperature resistant porcelain spare is fixed at described metal tube shell two ends, interspersed wire rod in the described high temperature resistant porcelain spare, the inner of described wire rod is electrically connected with the two ends of heating wire respectively, it is characterized in that: described heating wire constitutes by three sections at least, and wherein the heating wire section resistivity of contiguous U-shaped end is less than the heating wire resistivity away from the U-shaped end.
2. long-life type electric heating element according to claim 1 is characterized in that: described heating wire is the helical form heating wire, and the heating wire pitch of its contiguous U-shaped end is greater than the heating wire pitch away from the U-shaped end.
3. long-life type electric heating element according to claim 1 is characterized in that: described electric heating element is a reducing resistivity silk, and the heating wire diameter of its contiguous U-shaped end is greater than the heating wire diameter away from the U-shaped end.
4. according to claim 2 or 3 described long-life type electric heating elements, it is characterized in that: the inner of described wire rod is electrically connected with the two ends of helical form heating wire respectively with clamp structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201870134U CN201256455Y (en) | 2008-09-16 | 2008-09-16 | Long life type electric heating element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201870134U CN201256455Y (en) | 2008-09-16 | 2008-09-16 | Long life type electric heating element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201256455Y true CN201256455Y (en) | 2009-06-10 |
Family
ID=40739782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201870134U Expired - Fee Related CN201256455Y (en) | 2008-09-16 | 2008-09-16 | Long life type electric heating element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201256455Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109413772A (en) * | 2018-10-25 | 2019-03-01 | 深圳顺络电子股份有限公司 | A kind of porous heating component of high thermal efficiency and preparation method thereof |
| RU196234U1 (en) * | 2019-10-09 | 2020-02-21 | Общество с ограниченной ответственностью "Р-Климат" | Thermoelectric mat |
-
2008
- 2008-09-16 CN CNU2008201870134U patent/CN201256455Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109413772A (en) * | 2018-10-25 | 2019-03-01 | 深圳顺络电子股份有限公司 | A kind of porous heating component of high thermal efficiency and preparation method thereof |
| RU196234U1 (en) * | 2019-10-09 | 2020-02-21 | Общество с ограниченной ответственностью "Р-Климат" | Thermoelectric mat |
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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: 20090610 Termination date: 20120916 |