The bimetallic stainless steel temperature and pressure gauge is mainly composed of bimetallic temperature measuring elements and spring tube pressure measuring elements, which can simultaneously measure temperature and pressure. The following is its working principle:
Temperature measurement principle: A bimetallic strip is made by tightly bonding two metal sheets with different coefficients of thermal expansion together. When the temperature changes, due to the different degrees of thermal expansion of the two metals, the bimetallic sheet will undergo bending deformation. When the temperature rises, the metal with a higher coefficient of thermal expansion elongates more, and the bimetallic strip bends towards the metal with a lower coefficient of thermal expansion; When the temperature decreases, the bimetallic strip bends in the opposite direction. One end of the bimetallic strip is fixed, and the other end is connected to the pointer shaft. When the bimetallic strip bends due to temperature changes, it drives the pointer shaft to rotate, causing the pointer to indicate the corresponding temperature value on the dial.
Pressure measurement principle: The pressure measurement part is mainly based on the principle of spring tube pressure gauge. A spring tube is a hollow metal tube bent into a circular arc shape, with one end fixed and connected to the measured pressure source, and the other end closed and connected to the connecting rod mechanism. When the measured pressure is applied to the spring tube, the spring tube will deform under the pressure, and its free end will experience displacement. This displacement is transmitted to the gear transmission mechanism through the connecting rod mechanism, and through the meshing transmission of the gears, the small displacement of the spring tube is amplified and converted into the rotation of the pointer, thereby indicating the value of the measured pressure on the dial.
