What is a bimetallic belt?

Bimetallic belt is a simple device that converts thermal energy into mechanical movement. It is used as a thermally activated switch or heat indicator and works on the principle of differential expansion of heated different metals. The bimetallic belt consists of two different metals that are joined together to form a flat, flat belt or concentric coil. When the strip is heated, one of the metals is heated and expanded faster than the other, causing bending the strip. This mechanical deflection is then used in different ways to switch electrical circuits or move the dial to indicate the heat value until the heated material is contained at a certain point in it, will be expanded in a balanced way. If, for some reason, the material is contained or prevented by expansion after one of its surfaces, unlimited expansion in the rest will cause the material to be diverted or bending. Obviously some materials will warm up faster or expand more than others depending on their molecular structuree. If two such different materials are connected together, the one that heats up more slowly will limit the expansion along one face of the other and causes this phenomenon to be deflected.

This principle of thermal deflection of different materials is used to supply mechanical movement related to heat in a wide range of electrical and measuring devices. Bimetallic strips are generally constructed from two different metals with typical combinations of brass and steel and copper and steel. Both materials are usually welded, soldered or riveted together to create a uniform, safe connection between the two contact faces. Bimetallic strips can be created as straight or concentric elements with a coil. Their physical deflection after warming is then used in various ways to achieve different functions.

One of the most common methods of using a bimetallic strip deflection is the use of a strip as an Elektric contact to create or break the circuits. The heater thermostats are a good example of this type of application and keep contact with the switch point using a direct, shaking strip and maintain the heater circuit. When the temperature rises to a predetermined point, the stripe is heated and bends, breaking the perimeter and off the heating. When the strip cools again, straightens and reactivates the heater perimeter. This allows you to maintain a constant temperature range.

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bimetallic strip of the coil type tends to unfold as it heats and turns the needle of the thermometer of the type of dialing to indicate the value of the temperature. Bimetallic strips are also used as a device with thermal overload to reduce the power supply to the electrical equipment when they draw excessive current or physically overheat. The knitted characteristics of the expansion of various metals in the bimetallic strip make it possible to accurately adapt these devices at precise temperatures. As a result, strips are a reliable and affordable method of using heat as a control noBo measuring input.