Piezoelectric pneumatic valve in the application of intelligent pneumatic valve positioner 2)

smart pneumatic valve positioner, the logic of a gas state.
, the application of piezoelectric effect
piezoelectric crystal is a reversible electric energy and mechanical energy conversion function of ceramic material, it can be a mechanical energy into electrical energy, electric energy can be converted into mechanical energy.
by extrusion force piezoelectric crystal, and a mechanical deformation, crystal surface and the extrusion pressure is proportional to the charge, charge amplifier, through the charge can be converted into corresponding voltage output, used to generate the pressure sensor, ultrasonic power, receiver, etc.
the same applied electric field of piezoelectric crystal piezoelectric crystal size of the tiny changes can happen, because this kind of phenomenon is called the electrostrictive phenomenon, because it is the electric field generated by the mechanical deformation, and piezoelectric crystal is very big, almost no energy of internal resistance, such as can produce buzzer, ultrasonic generator, piezoelectric pneumatic valve is small, low power devices. 。 Piezoelectric P
, the forerunner of pneumatic valve
He Erbi - ORIGA piezoelectric P pilot pneumatic valve ( Figure) Through the piezoelectric thin film work, its structure is very flexible sheet metal bonding in piezoelectric membrane vacuum coating of the two working two electrodes on both sides of the piezoelectric crystal surface is flat and level.

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P work without power input hole closed, compressed air and output hole, pore bulky connection, the output pressure is; Power transistor to narrow, on the crystal elongation, leverage, so that the mechanical deformation can be extended to dozens of micrometers, big hole closed, compressed air from the distributed one, two, generates a signal output pressure, bending piezoelectric thin film and the size of the input voltage variation degree, so the pilot can use as a switch P piezoelectric pneumatic valve pneumatic valve or proportion. Pressure curve of output voltage as shown in figure, the forerunner of pneumatic valve response time less than ms piezoelectric less.

P pressure
voltage curve, pneumatic valve
P piezoelectric switch He Erbi - ORIGA piezoelectric pneumatic valve P ( Figure) By the piezoelectric P pilot pneumatic valve, switch power amplifier, miniature pneumatic valve and mu m ventilation dynamic filters composed of valve.
: operating voltage VDC
working current: & amp; lt; Mu:
to maintain current mu A
response time: & amp; lt; Milliseconds ( In the pressure of
% or %)
capacity: & amp; lt; NF:
work pressure. - 。 Bar flow:

litres/minute ( From the bar)
working temperature: - 吗? + c
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