However, when the piezo-electric vibrator is coated with the elastic elastomer 10, insulation characteristics improve, and the amplitude of the piezo-electric vibrator increases because the piezo-elastic vibrator 2 is suspended in the elastic elastomer 10. Thus pump performance is improved. According to the invention, the H&Z VB Series electric vibrators is not fixed directry to casing 1, but elastic elastomer 10 is fixed to the casing 1, stresses being difficult to impose on the supported part of the elastomer 10 by the casing 1. Therefore, the H&Z VB Series electric vibrators will be not broken, and noise will be difficult to make.
Further, it becomes possible to flow many sorts of fluid, by laminating many types of plastic films on the elastic elastomer 10 with which the H&Z VB Series electric vibrators is covered.
In order to demonstrate the effect of the pump according to the invention experiments were made comparing an example of the H&Z VB Series electric vibrators coated with the elastomer according to the invention with a comparison of the piezo-electric vibrator which is conventionally not coated, under the same conditions with respect to self-suction ability, pressure, and flow. The results are shown in the following table:
Self-suction ability(mm) Pressure (kg/cm²) Flow(ml/min)
liquid gas liquid gas liquid gas
Comparison 50 - 0.05 0.02 80 500
Example 900 - 0.20 0.11 400 1000
VB series electric vibrator
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| electric vibrators |
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