The characteristics and advantages of several kinds of laboratory heating plates are analyzed
The heating plate in laboratory is made of glass and ceramic with good chemical stability, which has the effect of safe heating and constant temperature control. The heating plate which is widely used in laboratory has a high safety system, including fixed safety circuit, overheat display and error display. A contact electronic thermometer can also be installed in the heating plate, which can achieve high precision temperature control effect. The three characteristics of the laboratory heating plate are functionality, safety and durability.
Generally speaking, heating plates used in laboratories can be divided into the following types: thin shell heating plates, carbon crystal electric heating plates, cast plate heating plates, tubular element plates and tubular element cast plates. Each type of heating plates has its own different characteristics, among which:
1. Thin shell heating plate: thin shell electric heating plate is embedded with spiral electric heating wire in the shell formed by metal sheet stamping. Between the spiral electric heating wire and the metal shell is filled with thermal conductivity and insulation filler. This kind of metal thin shell type structure is simple, the price is cheap, but the plate surface is easy to deform, after long time use the thermal efficiency has the decline phenomenon, therefore generally makes the 800W below the small power electric heating plate.
2. Cast plate heating plate: the structure of cast plate heating plate is the same as that of thin shell heating plate, except that the plate surface is a metal casting piece, so the strength is large and the plate surface is not easy to deform. At present, most of China adopts this structure. Tubular element heating plate is a heating plate formed by bending the tubular metal heating element into a plane spiral involute. This kind of tubular metal heating element is a semicircular section with a flat surface. Such a section makes a larger heat transfer surface between the heating plate and the bottom of the cooking pot, so as to improve the thermal efficiency.
3. Carbon-crystal electric heating board: carbon-crystal electric heating board is an electric heating board with carbon-crystal material as the theme of heating material. A plate-like heating material without a heating wire and without a metal shell. Mainly by adding an electric field to the plate, the molecules inside the plate friction heat; Therefore, the safety factor of carbon crystal electric heating plate is higher, and there is no possibility of electric leakage. Carbon crystal electric heating plate is a new type of heating plate with better flexibility than other types of electric heating plate.
4. Tubular element casting plate: the tubular element casting plate heating plate is a complete heating plate made of si-al alloy or si-cu alloy after bending into the shape of 1-5 rings with the tubular heating element. Compared with tubular element heating plate, it has a larger effective heat transfer surface with the bottom of the pot. This kind of structure has big mechanical strength, long life and high thermal efficiency, which is especially suitable for ships, vehicles and other vibrating environments.