Deep analysis of the operating principle of pressure switch action
As a device capable of converting pressure signals into electrical signals, pressure switches operate based on the combined effects of mechanics and electricity. A deep understanding of the operating principle of pressure switch action can help us better utilize this component and ensure the safe and stable operation of the system.
The pressure switch is mainly composed of pressure sensors, signal processing circuits, and actuators. The pressure sensor is the core component of a pressure switch, which can sense changes in external pressure. Common pressure sensors include diaphragm type, bellows type, and piston type. Taking a diaphragm pressure sensor as an example, when the system pressure acts on the diaphragm, it will deform. This deformation will be transmitted to the signal processing circuit through the mechanical structure.
The function of the signal processing circuit is to convert the mechanical signal transmitted by the pressure sensor into an electrical signal. When the membrane undergoes deformation, it will drive the micro switch or electronic component connected to it to act. In micro switch type pressure switches, the deformation of the diaphragm will cause the contacts of the micro switch to close or open, thereby achieving the on/off of the circuit. In pressure switches based on electronic components, the deformation of the diaphragm can cause changes in electronic parameters such as resistance and capacitance. Through circuit conversion and amplification, these parameter changes are converted into electrical signals for output.
The executing mechanism performs corresponding actions based on the electrical signals output by the signal processing circuit. When the pressure reaches the set value, the electrical signal output by the signal processing circuit will trigger the actuator, such as a relay, to control the start and stop of external equipment. For example, in an air conditioning system, when the pressure in the refrigeration system is too high, the pressure switch will activate to cut off the power supply to the compressor through a relay, preventing the compressor from being damaged due to high pressure.
The action setting value of the pressure switch can be adjusted. Usually achieved by adjusting the spring or potentiometer inside the pressure switch. Adjusting the tightness of the spring can change the force state of pressure sensors such as diaphragms, thereby adjusting the action threshold of the pressure switch; By adjusting the potentiometer, the parameters of the signal processing circuit can be changed to achieve precise setting of the pressure switch action value. In practical applications, it is necessary to set the action and reset values of the pressure switch reasonably according to the working requirements of the system, in order to ensure that the system operates within a safe and stable pressure range.
#Pressure switch, operating principle, signal conversion
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