The operating mechanism of the bellows vacuum pressure switch

The working mechanism of the bellows vacuum pressure switch is mainly based on the mechanical deformation of the bellows and the linkage of the mechanical structure, thereby achieving the conversion of pressure signals to electrical signals, as follows:

Pressure perception and mechanical deformation

The bellows vacuum pressure switch is equipped with a bellows, a key elastic element. When the vacuum pressure within the system changes, the bellows will undergo corresponding mechanical expansion and contraction changes. For example, when the pressure increases, the bellows will elongate; When the pressure drops, the bellows will contract. This deformation is the basis for the switch to sense pressure changes.

Mechanical structure linkage

The expansion and contraction changes of the bellows will be transmitted through mechanical structures such as mechanical rods. The mechanical rod further amplifies and conducts the deformation of the bellows, eventually triggering the microswitch. The microswitch is a key component for the switch to output electrical signals. When pushed by the mechanical rod, the microswitch will act, thereby changing its on-off state.

Electrical signal output and control

After the microswitch operates, a corresponding electrical signal output will be generated. When the vacuum pressure within the system is higher or lower than the set pressure, the pressure sensor inside the controller (here, the bellows and related mechanical structures play a similar role as sensors) immediately acts, causing the switch contacts inside the controller to open or close. For example, when the pressure reaches or exceeds the set upper limit value, the contacts open, cutting off the relevant circuit and causing the equipment to stop working. When the pressure returns to the pressure range set by the equipment, the contact is connected and the equipment resumes normal operation. In this way, the automatic control and protection of the pressure in the vacuum system have been achieved.