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Valveless piezoelectric pump based on wall attachment effect

A valveless piezoelectric pump and Coanda effect technology, which is applied to components of pumping devices for elastic fluids, pumps with flexible working elements, pumps, etc., can solve the problems of low volumetric efficiency of valveless piezoelectric pumps , to achieve the effect of simple structure and easy miniaturization

Active Publication Date: 2013-04-03
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a valveless piezoelectric pump with simple structure and high volumetric efficiency based on the Coanda effect to solve the problem of low volumetric efficiency of existing valveless piezoelectric pumps.

Method used

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  • Valveless piezoelectric pump based on wall attachment effect
  • Valveless piezoelectric pump based on wall attachment effect
  • Valveless piezoelectric pump based on wall attachment effect

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Embodiment 1

[0026] Embodiment 1: This embodiment is a fluid numerical simulation, and the structural dimensions of this embodiment are as follows Figure 11 As shown, the specific dimensions are: the minimum cross-sectional width a of the manifold 10 is 100 μm, the length L is 450 μm, and the cone angle is 40°, the transition fillet radius r between the pipe wall near the outlet flow pipe 12 and the pump cavity 3 is 100 μm, and the width of the inlet flow pipe 11 and the outlet flow pipe 12 , Both are 210μm, the included angle is 30°, the depth h of the entire cavity is 100 μm, and the volume change of the pump cavity 3 caused by the vibration of the piezoelectric vibrator 5 is replaced by a sinusoidally changing velocity boundary condition, the frequency is 100 Hz, and the average velocity of the minimum section of the manifold 10 is at most 10 m / s, the fluid medium is water, and the SST turbulence model is used.

[0027] Figure 8 and Figure 9 Shown are respectively the veloc...

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Abstract

The invention relates to the technical field of micro fluid transmission and control and micromechanics, in particular to a valveless piezoelectric pump based on a wall attachment effect. According to the adopted technical scheme, the valveless piezoelectric pump comprises a pump body, a pump cover and piezoelectric vibrators, wherein the pump body is bonded with the pump cover; the piezoelectric vibrators are fixedly arranged above the pump cover; a pump inlet and a pump outlet are formed in the pump cover; the pump body is provided with a pump cavity, an inlet cavity, an outlet cavity and a three-way tube; the inlet cavity is communicated with the pump inlet; the outlet cavity is communicated with the pump outlet; two shunting tubes of the three-way tube refer to an inlet flow tube and an outlet flow tube respectively; the inlet flow tube is communicated with the inlet cavity; the outlet flow tube is communicated with the outlet cavity; and a converging tube of the three-way tube is a planar conical tube, and is communicated with the pump cavity. The valveless piezoelectric pump is characterized in that a tube wall, which is close to the outlet flow tube, at a position with a smallest section on the converging tube is in round corner transition connection with the pump cavity, and a tube wall which is close to the inlet flow tube is in pointed angle connection with the pump cavity. The valveless piezoelectric pump has the beneficial effects of simple structure, easiness in minimizing, and over 50 percent of the pump volume efficiency.

Description

technical field [0001] The invention relates to the field of microfluidic transmission and control and micromechanical technology, in particular to a valveless piezoelectric pump based on the Coanda effect. Background technique [0002] Piezoelectric pump is a kind of mechanical micropump, which belongs to positive displacement pump. It is widely used in the fields of micro-transportation of drugs, cell separation, cooling of electronic products (such as CPU), micro-injection of fuel, chemical micro-analysis, transition control in pipeline flow, etc.; Piezoelectric pumps can be divided into valved piezoelectric pumps and valveless piezoelectric pumps according to whether there is a valve structure. The valved piezoelectric pump has a valve structure, which is not easy to process, which limits the miniaturization of the pump body and the operating frequency. Generally lower; the structure of the valveless piezoelectric pump is simple, more suitable for miniaturization, and ca...

Claims

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Application Information

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IPC IPC(8): F04B43/04F04B53/00
Inventor 杨嵩袁寿其何秀华蔡盛川韦丹丹
Owner JIANGSU UNIV
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