| Piezoelectric Pump is a new-type PZT driver device, with acting the vibration produced by the PZT bimorph on fluid and produces pressure or flux output. According to their structures, PZT pumps can be divided into two categories, one with valves and another without valves. Actuator, gearing and pump body of traditional pump are integrated together in PZT pumps without valves. So it is of great valve in some special circumstance for its simplified structure, improved working reliability and possibility for miniaturization and transmission fluid with suspended granule.On the basic of fundamental character research of PZT pump without valve, beginning with the improvement of PZT pump's flux and pressure output, this paper proposes an assumption, single-bimorph PZT pump with two chambers using one PZT bimorph to fabricate two chambers. Some samples are designed made experimentally tested. Related theoretical analysis is done using Piezoelectricity and hydromechanics. In order to control PZT pump's ejecting status with sound or music, Circuit board controlled by sound suitable for single-bimorphed PZT pump with two chambers is design, fabricated and tested. Introduction This paper introduces current development of PZT pump inside are outside of our country. The structural characters and working principles of two different PZT pump are explained. In addition, PZT pump's development tendency, structural miniaturization, low consumption of power and high output precision.The vibration analysis and test of bonding circular PZT bimorphAt first, PZT material, PZT effect, vibration mode of PZT bimorph are introduced and geometry equation and constitutive equation of piezoelectric bimorph are given, providing theoretical warrant for PZT bimorph's vibration analysis. Special insulation disposal to PZT bimorph with special characters is done and insulation trait is qualitatively analyzed. Radial deformation of PZT bimorph is tested, showing the center biggest, and deformation getting smaller closer to the edge. At last, central maximum deformation of insulated PZT bimorph by inputting different driven voltage signals is tested. Then we draw the conclusion that its deformation is the biggest by rectangular wave, bigger by sine wave, the smallest by triangle wave. The deformation of PZT bimorph is in positive proportion to it driven voltage and below the damage voltage, the higher is the voltage , the bigger is the PZT bimorph's deformation.3. Theoretical analysis of single-bimorphed PZT pump with two chambers. On the basis of analysis to single-bimorphed single-chambered PZT pump without valve , the single-bimorphed single-chambered PZT pump is prospered designed and fabricated. Through comparing single-chambered pump to two-chambered pump higher flux output of single-bimorphed two-chambered PZT pump is explained. Basic theory of hydromechanics related with PZT pump is expounded. And quantitative analysis on PZT pump's flux output is done . elements affecting single-bimorphed two-chambered PZT pump's function are analyzed such as chamber structure and the structure of inlet and outlet pipe. All of this provides theoretical warrant for optimizing design of PZT pump avoids sectional salvations structure, decrease local pressure lose and improves PZT pump's output ability .4. Experimental research of single-bimorphed PZT pump with two-chambered. Two-chambered PZT pump's output ability is compared to that of single-chambered PZT pump, the output pressure and flux single-bimorphed two-chambered PZT pump acting as main tested parameters and the experiment shows that the output flux of former is obviously improved.Some elements affecting the output ability are tested such as outlet length, the length of with taper, the volume of glacis chamber two inlets and single inlet etc. and result is that the optical outlet length is three to four times the outlet diameter and the optical glacis chamber's diameter is 3.5 to 4mm. Comparing two inlet to one inlet, output flux and pressure don't change a lot,... |
PDF Full Text Request