Vrsta grelnega elementa

Posamezni ogrevalni elementi ne vključujejo celotnega ogrevalnega sistema . Poleg grelnega elementa vključuje tudi terminale, vodnike, izolacijo, pakiranje, suknjič in tesnila . Ti grelniki prihajajo v različnih oblikah in konfiguracijah, da ustrezajo določenim aplikacijam ., so vrste ogrevalnih elas.

1. grelnik zračnega procesa:As the name suggests, this type of heater is used to heat moving air. An air handling heater is basically a heated tube or pipe with one end used to bring in cold air and the other end as a hot air outlet. Along the pipe walls are heating element coils insulated by ceramic and non-conductive gaskets. These are typically used in high flow, low pressure Aplikacije . aplikacije za grelnike za ravnanje z zrakom vključujejo toplotno krčenje, laminiranje, aktivacijo lepila ali strjevanje, sušenje, peko in več .

2. grelnik kartuše:In this type of heater, resistance wire is wrapped around a ceramic core, usually made of compacted magnesium oxide. A rectangular configuration is also available, in which a coil of resistive wire passes three to five times along the length of the cartridge. Resistance wires or heating elements are located near the walls of the sheathing material for maximum heat transfer. To protect internal components, sheaths are often made of corrosion-resistant materials such as stainless steel. The leads are usually flexible and their two terminals are located at one end of the cartridge. Cartridge heaters are used for mold heating, fluid heating (immersion heaters) and surface heating.

3. grelnik cevi:Notranja struktura grelnika cevi je enaka kot pri grelniku kartuše . Glavna razlika od grelnika kartuše je, da se svinčevimi terminali nahajajo na obeh koncih cevi ., da se lahko celotna celarna struktura upogne v različne oblike, da se ogrevata, da se ogreva {2}, da se ogreva {2}, da se ogreva {2}, ki se ogrevajo {2}, ki se ogrevajo {2}, ki se ogrevajo {2}, ki se ogrejejo {2}, ki se ogrevajo {2}, ki se ogrevajo {2}, se lahko ogreva {2}, ki se ogrejejo {2} na površino plašča, ki pomaga pri učinkovitem prenosu toplote . cevasti grelniki so tako vsestranski kot grelniki kartuše in se uporabljajo v podobnih aplikacijah .

4. grelniki pasov:Ti grelniki so zasnovani tako, da se ovijejo okoli cilindričnih kovinskih površin ali posod, kot so cevi, sodi, bobni, ekstruderji itd. Izdelana iz nerjavečega jekla ali medenine . Druga prednost uporabe grelnika pasu je, da posredno segreva tekočino znotraj zabojnika . To pomeni

5. Strip grelec:This type of heater comes in a flat rectangular shape and is bolted to the surface to be heated. Its internal structure is similar to that of a strip heater. However, insulating materials other than mica can be ceramics such as magnesium oxide and fiberglass. Typical uses for strip heaters are surface heating of molds, molds, platens, Rezervoarji, cevi itd.

6. jetljivi grelniki folije:Etched foil heaters may also be called thin film heaters. In this type, the resistive heating material is etched and bonded to a foil, usually made of aluminum. If higher flexibility and tear resistance are required, the base material can also be made of heat-resistant synthetic rubber or thermoplastic polyurethane (TPU). Commonly Uporabljene prilagodljive ogrevalne liste, kot so PET električni ogrevalni film, FPC električni ogrevalni film in silikonski električni ogrevalni listi . večinoma jedkanimi grelniki folije . Poleg njegove prilagodljivosti je še ena prednost, ki je enaka, da je enakovredna prednost fotohemičnega etchemmemical etching etchemical etcha thermal distribution with greater thermal density in such a small form. Compared with traditional wire heaters, its application is more professional. Etched foil heaters are commonly used in medical devices, electronics and instrumentation, aerospace and apparel. One side can be lined with an adhesive layer for easier installation.

7. keramični grelniki:These heaters use ceramics with high melting point, high thermal stability, high temperature strength, high relative chemical inertness and small heat capacity. Note that these are not the same ceramics used as insulation. Due to its good thermal conductivity properties, it is used to conduct and distribute heat from heating elements. Ceramic heaters of note are silicon nitride and aluminum nitride. These are often used for rapid heating, as seen on glow plugs and igniters. However, when subjected to rapid high-temperature heating and cooling cycles, the material is prone to cracking due to fatigue caused by thermal stress. A special type of ceramic heater is PTC ceramic. Ta vrsta lahko samoregulira svojo porabo energije in tako prepreči, da bi obrnil rdečo .

8. grelnik keramičnih vlaken:V tej vrsti grelnika keramična vlakna deluje kot izolator in koncentrira toploto na površino, da se segreje, da se prepreči izgube sistema . Ena stran blazinice keramičnih vlaken je zavita z uporniško žico . Ta stran je vezana na površino, ki jo je mogoče segreti na 1.200 stopinj.