Operation bimetal. Left cold condition, right warm. Both strips are clamped in the bottom drawings. The expulsion and bending here are highly exaggerated. Bimetaal responds to heat of lighter wall thermostat for CV installation 2 = bimetal strip, 4 = switch that connects when it touches the metal pin 5.
A bimetall usually consists of a strip of two different metals that are very firmly connected.
The term most commonly used is in metals with different expansion coefficients, to make thermostats and thermometers. However, there are also other applications of bimetallic, such as circular saws with bimetallic saw blades, for example to combine resilience with abrasion resistance. Thermostat and thermometer
A bimetallic strip for a thermostat consists of two different rolled pieces of metal, often invar and stainless steel (stainless steel). These two metals have different expansion coefficients, which will bend the bimetall during temperature change: one section is stronger than the other. In order to achieve a greater divergence or to achieve a greater adjustment force, a long strip is required. Usually, the strip is rotated spirally so that it fits into a small housing.
Bimetallic structures are used in all kinds of temperature monitoring purposes; as with the thermostat in a refrigerator or on heating. In particular, a switch is sent with the bimetall.
To use the effect in a thermometer (bimetallic thermometer), the deviation is transferred to a pointer that moves past a scale.
With bimetal, all kinds of temperature-sensitive switches can be made; Bimetallic switches are used inter alia in starters of fluorescent lamps and also as thermal protection. These switches, called clixons, can be found in, among other things, kettles, vacuum cleaners, irons, etc. Bimetal and alloy
An alloy is something very different from a bimetall: two metals are mixed with an alloy, while a bimetall consists of two distinct pieces of different metal.
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