The working characteristics of the elastic element of the vacuum pressure switch

The working characteristics of the elastic element of the vacuum pressure switch are as follows:

Elastic deformation characteristics

When the deformation is not significant, the elastic characteristics of the elastic element basically conform to Hooke's Law, and there is a certain functional relationship between its load and displacement. By taking advantage of this property, the elastic element can convert pressure into mechanical displacement, thereby triggering the switch to act. Common elastic elements include single-coil spring tubes, diaphragms, diaphragm boxes and bellows, etc. They all have elastic deformation characteristics and can meet the functional requirements of pressure switches.

The deformation characteristics of different components

Spring tube (Bourdon tube) : It generates displacement by the deformation of a curved metal tube under pressure and is often used in medium and high-pressure measurements. When the pressure changes, the spring tube will bend and deform, and its free end will shift, thereby pushing the switching element.

Diaphragm: A thin sheet made of metal or non-metal materials, whose center shifts under pressure. It is suitable for low-pressure or differential pressure detection. The diaphragm will bulge or dent to one side under pressure, and the deformation amount is related to the magnitude of the pressure.

Diaphragm box: It is formed by welding two diaphragms to create a cavity, which increases sensitivity and is suitable for minor pressure changes. When the pressure changes, the two diaphragms of the diaphragm box will undergo relative displacement, thereby generating mechanical displacement.

Bellows: A cylindrical structure with multiple bellows, it expands axially under pressure and is suitable for applications with lower pressure and greater displacement required. Under the action of pressure, bellows will elongate or shorten along the axial direction, and the displacement amount is proportional to the magnitude of the pressure.

Trigger the switch to act

After the free end of the elastic element moves, it will directly or after comparison push the switch element, changing the on-off state of the switch element to achieve the purpose of controlling the measured pressure. For instance, when the vacuum pressure within the system reaches the set threshold, the displacement of the elastic element will cause the microswitch to close or open, thereby outputting an electrical signal to achieve control and protection of the system.