Valveless piezoelectric pump with axisymmetric logarithmic spiral pipe

Abstract

The invention relates to a valveless piezoelectric pump, more particularly to a valveless piezoelectric pump with axisymmetric logarithmic spiral pipes. The valveless piezoelectric pump with axisymmetric logarithmic spiral pipes comprises a pump body, a pump cover and a piezoelectric vibrator. An inlet flow tube, an outlet flow tube and a pump chamber are provided on the pump body. The inlet flow tube and the outlet flow tube have the same structure, are arranged coaxially, and are concentric and equidistant with the pump chamber center. The inlet flow tube and the outlet flow tube are both axisymmetric logarithmic spiral pipes. Profiles of the axisymmetric logarithmic spiral pipes are logarithmic spiral lines defined by a logarithmic spiral curve equation: rho = rho0 * e<k theta>. The pump of the invention has the main advantages of small scale, simple structure, easy miniaturization, capability of acquiring stable pressure, steady flow inside the pump with almost no eddy, and no damage to a transmission medium. Compared with valveless piezoelectric pumps with other structures, the valveless piezoelectric pump with axisymmetric logarithmic spiral pipes has lower unidirectional flow resistance and higher forward and reverse flow resistance coefficient ratio. Thus, the pump has higher volumetric efficiency, more stable flow can be obtained, and energy loss is significantly reduced.

Description

technical field [0001] The invention relates to a valveless piezoelectric pump, in particular to an axisymmetric logarithmic spiral tube valveless piezoelectric pump. 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, micro-injection of fuel, chemical micro-analysis, transition control of pipeline flow, etc. At present, piezoelectric pumps mainly There are two types of piezoelectric pumps with valves and piezoelectric pumps without valves. Due to the existence of valves, piezoelectric pumps with valves will cause a large pressure loss when the fluid passes through the valves, and it is too difficult to start the water injection process, and it is difficult to process and integrate. It is relatively large, which limits the development of the piezoelectric pump to a more miniaturized dir...

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Problems solved by technology

[0003] Commonly used diffusion / contraction tube valveless piezoelectric pumps include "Y" tube valveless piezoelectric pumps and "V" tube valveless piezoelectric pumps, and the inlet and outlet flow tubes of "Y" tube valveless piezoelectric pumps It consists of a confluence pipe and two diversion pipes forming a "Y" shape. The confluence pipe and the diversion pipe are all rectangular pipes with equal cross-sections. The inlet flow pipe of the "V" tube valveless piezoelectric pump is composed of a rectangular pipe with equal cross-section as the confluence pipe and two diffuse (shrink) shunt pipes. The defect is that the inlet and outlet flow pipes and the pump chamber are not on the same plane On the other hand, the structure is relatively complicated and the processing is difficult

Patent 201010505915.X discloses a logarithmic spiral combined tube valveless piezoelectric pump used in the field of microfluidic transmission and control. It is composed of two split logarithmic spiral tubes connected to the large end of the conical tube, and both are rectangular cross-section tubes. The logarithmic spiral combined tube is easier to control the flow rate of the valveless piezoelectric pump, and the energy consumption is reduced to a certain extent, but the structure is relatively complicated. , not conducive to integration and miniaturization

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