The traditional pneumatic valves use a lot of the electromagnet as an electro-mechanical conversion stage, the electric control signal is converted to mechanical displacement, pushing the valve, switch or gas pressure, gas flow ratio control. As the electromagnet conversion level electro-mechanical has low price, convenient operation and use; but it also has many disadvantages: such as high power consumption, low response speed, the presence of fever and electromagnetic interference etc.. The electro-mechanical conversion characteristics of piezoelectric material is introduced into the pneumatic valve, as the electro-mechanical conversion level pneumatic valve, which is a new technique different from traditional pneumatic valve. Uses the piezoelectric technology pneumatic valve in the performance of a traditional pneumatic valve there is nothing comparable to this advantage.
Piezoelectric effect
For hemimorphic crystal symmetry center does not exist in the crystal structure, crystal on the tension, compression stress or shear stress, in addition to generate deformation corresponding, will also be in the crystal induced dielectric polarization and electric field. This phenomenon is called positive piezoelectric effect; conversely, if the electric field in the crystal, so that the crystal electrode, the crystal will also appear at the same time strain or stress, that is the inverse piezoelectric effect. The two known as the piezoelectric effect. In 1880 Curie brothers discovered the piezoelectric effect of tourmaline, from the beginning of piezoelectricity history. Piezoelectric type pneumatic directional valve is the use of piezoelectric inverse effect and the development of the.
Piezoelectric technology in the application of pneumatic valve.
The miniature direct-acting valve
The deformation of piezoelectric materials in the field, to realize the pneumatic valve opening and closing, so that it can be made into a miniature direct-acting valve. As shown in the following illustration of miniature two position three way directional control valve, 1 port is an air inlet, 2 for the output port 3, port, port to the exhaust port, bending parts valve in the middle is a PZT piezoelectric material. When there is no external electric field, the valve in the: Figure 1: close the inlet, output ports 2 through the exhaust port 3 through the atmosphere. When applied to the piezoelectric valve to control the electric field, the piezoelectric valve plate deformation warping, piezoelectric valve upward closed exhaust port 3, while the inlet 1 and output port 2. This is the full realization of the traditional two position three way electromagnetic valve function.
Piezoelectric electro-pneumatic proportional pressure regulating valve
Piezoelectric material deformation is proportional to the strength of the applied electric field on it, use this feature, you can develop a proportional pressure regulating valve. As shown in Figure 3, applying different control voltage to piezoelectric valve plate, piezoelectric valve plate bending deformation of different, so that the air inlet of the air between 1 and 2 output and output port 2 and exhaust port 3 is formed between the airflow resistance of different, resulting in the output port 2 are different gas pressures the. Because of the piezoelectric valve without mechanical friction force in the deformation process, and the piezoelectric valve has the characteristics of fast response and low power consumption, electric proportional piezoelectric valve pressure regulating valve much better performance than the conventional proportional pressure regulating valve based on. For example, its not dead, pressure can be continuously regulated from zero; the fast response, can meet the requirements of application of high speed system; its low power consumption, low requirement for power supply.
The piezoelectric valve for pneumatic pilot valve
The miniature piezoelectric valve as the pilot stage, further amplification of the gas flow and pressure, can be in line with international standards for the size of piezoelectric pneumatic valve, electromagnetic valve, many of its properties are superior to the traditional.
The unique advantage of piezoelectric pneumatic valve and its application
Compared with the traditional electromagnetic gas valve, the valve pressure electric technology, with low power consumption, fast response and no electromagnetic effect and other advantages, so it opens up many new areas of pneumatic technology application.
Summary
Piezoelectric type pneumatic valve is the piezoelectric technology into the pneumatic valve of a new technology, compared with the traditional pneumatic valves, it has low power consumption, fast response, no electromagnetic interference, long service life and no heat etc.. It has a broad application in the field of industrial automation and process control.
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