Summarize the structural principle of special magnetic assisted electric contact pressure gauge
Special magnetic assisted electric contact pressure gaugeIt consists of a measurement system, indicator device, (ordinary type) device, housing, regulating device, and junction box. When the measured pressure acts on the spring tube, its end produces corresponding elastic deformation displacement, which is amplified by the transmission mechanism and indicated on the dial by the indicator device. At the same time, the pointer drives the movable contact of the electrical contact device to make contact with the contact (upper or lower limit) on the set pointer, causing the control system to turn on or off the circuit, in order to achieve automatic control and send alarm signals.
Special magnetic assisted electric contact pressure gaugeThe electrical contact signal pin of the device is equipped with an adjustable magnetic steel, which can increase the contact suction force, accelerate the contact action, make the contact reliable, eliminate the arc, and effectively avoid frequent disconnection of the instrument due to working environment vibration or medium pressure pulsation. So this instrument has the advantages of reliable operation, long service life, and high contact switch power.
In order to adapt to the different needs and requirements of the tested objects, the Huaqing series instruments have successively developed various types of products, including anti vibration, corrosion-resistant, durable and anti vibration, as well as isolation devices, on the basis of the original ordinary type and type (including different series such as ammonia, oxygen, temperature resistance, and shock resistance).
From the wiring diagram, it is obvious that 2 is the common point, 1 is the lower limit, and 3 is the upper limit. The control process is as follows: when the pressure reaches (or when the power is turned on) *, the movable contact (common terminal of the power supply) of the electric contact pressure gauge is connected to the lower limit contact, relay J1 is activated and self-locking, its normally open contact is closed to drive J3, and the motor is powered on to operate. When the pressure reaches the upper limit, the movable contact is connected to the upper limit contact, and the relay J2 is activated. Its normally closed contact is disconnected, cutting off the power supply to J1. Its normally open point is disconnected, J3 is released, and the motor stops running. Repeat this process to achieve automatic control.