The invention discloses a novel
capacitance plate suspension structure of a
differential motion metal capacitance diaphragm
capsule and belongs to structures of
differential motion metal capacitance diaphragm capsules used in a
pressure sensor series of industrial
automation products. According to the novel capacitance plate suspension structure, an isolation diaphragm and a
protection ring are arranged at the lower end of a
metal substrate, a metal pressure
guide tube is connected to the inner face of the
metal substrate, the other end of the metal pressure
guide tube is connected with a
ceramic ring and a
ceramic cap in a
half metal cup body, metal oil filling tubes are arranged at the upper end in glass at the inner end of the
half metal cup body, and
silicon oil is filled in inner cavities of the metal oil filling tubes. The novel capacitance plate suspension structure solves the problems that an existing
differential pressure transmitter is poor in disturbance resistance, measuring precision and stability, and plays the function of insulating electric signals. When pressure to be measured is respectively acted on the insulating diaphragm of the
differential motion metal capacitance diaphragm
capsule, the pressure is transmitted to the two sides of a central metal diaphragm in the form of
liquid pressure transmission through the
silicon oil in the cavities of the diaphragm
capsule, so that the working principle of the differential motion metal capacitance diaphragm is maintained unchanged, and the disturbance resistance capacity and the stability of a capacitance
differential pressure transmitter are greatly improved.