Piezoelectric pulse propeller with high mass flow and underwater robot

Abstract

The invention discloses a piezoelectric pulse propeller with high mass flow and an underwater robot. The pusher comprises an inflow layer, a composite alloy layer, a vibration substrate layer, a vibration layer, an upper electrode layer and a shell layer which are sequentially stacked, and a blocking layer and an O-shaped sealing ring which are located between the composite alloy layer and the vibration substrate layer. A gap between the O-shaped sealing ring and the blocking layer forms a variable pressure chamber; according to the invention, when the piezoelectric vibrator performs negative displacement, the radial edge of the vibrator is firstly tightly attached to the sealing ring, the volume of the variable-pressure chamber is increased, and fluid is sucked due to negative pressure; when the piezoelectric vibrator moves positively, the center of the vibrator is firstly tightly attached to the inflow hole of the composite alloy layer, the radial edge of the vibrator is far away from the sealing ring, fluid in the variable-pressure cavity is forced to enter the output flow channel, the fluid lost by the output flow channel when the piezoelectric vibrator moves negatively is supplemented, and fluid is provided for next spraying; and high-frequency vibration is carried out in cycles, so that pulse injection of the fluid is realized, and one-way high-quality flow conveying of the fluid is realized.

Description

technical field [0001] The invention belongs to the technical field of micro underwater drives, and in particular relates to a piezoelectric thruster using a petal-shaped piezoelectric material and a superelastic nickel-titanium composite metal substrate and a preparation method thereof, which can be applied to the propulsion of a micro robot. Background technique [0002] Traditional underwater propulsion has always been dominated by rotary propulsion, such as propeller propulsion, pump jet propulsion (which also uses high-speed rotation of the blade to inhale fluid and then eject it) and so on. The conventional propeller has the disadvantages of complex structure, severe wear, and relatively low efficiency due to lateral force. Also due to the existence of relative rotation, it is also very difficult to process in terms of miniaturization and integration. Based on this, subsequent scholars and engineers have also proposed non-rotating propulsion methods such as flapping w...

AI Technical Summary

Problems solved by technology

However, in order to realize the piezoelectric pulse thruster, the traditional design will encounter three problems: one is the one-way movement of the fluid, the other is the high heat loss during the working process, and the third is the mass flow rate is not large enough

The dislocation movement of atoms in the vibrator polycrystal caused by bending or deflection will continue to generate heat, resulting in a large heat loss

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