The float-type liquid temperature switch consists of a float, connecting rod, temperature control element (e.g., bimetallic strip), and contact switch. Its operation combines buoyancy principles with thermal expansion/contraction mechanisms. When liquid temperature remains within normal range, the float floats on the surface due to buoyancy, connected to the temperature control element via a connecting rod. As temperature rises, thermal expansion causes density reduction, causing the bimetallic strip (a metal alloy combining two materials with different coefficients of thermal expansion) to deform. The strip bends toward the material with lower expansion coefficient when temperature increases. When reaching the preset upper limit, sufficient bending triggers the connecting rod to shift the float position, activating the contact switch to cut off power or activate cooling systems. Conversely, when temperature drops below the lower limit, the bimetallic strip returns to its original shape, and the float reverts to its initial position under buoyancy. This reset activates the contact switch, reconnecting power or stopping cooling to maintain temperature within the set range.
