![]() ![]() The appearance of the valveless piezoelectric pump with cone-shaped tubes influences directly the classification of pumps. Hence, the valveless piezoelectric pump encompassing these tubes is known as valveless piezoelectric pump with cone-shaped tubes. The two aforementioned flow tubes are collectively named cone-shaped tubes by their shape. Along flow direction, the tube whose cross-section broadens is defined as the diffuser tube, while the one whose cross-section tapers off is defined as the nozzle tube. The proposed pump consists of a diffuser, a nozzle and a piezoelectric vibrator, where the diffuser and the nozzle are mounted below the pump chamber as inlet and outlet of pump, and the piezoelectric vibrators are used as driving source to generate reciprocating change of volume in pump chamber. ![]() It marked the birth of the first non-rotary pump without any movable valve body driven by piezo-vibrators, which is invented based on the dynamic passive valve presented by Smith. In 1993, Swedish scientists Stemme et al, published the paper entitled “A valveless diffuse/nozzle-based fluid pump”. This paper summarizes the current valveless piezoelectric pumps with cone-shaped tubes and points out the future development, which may provide guidance for the research of piezoelectric actuators. Finally, it is deduced that bionics is pivotal in the development of valveless piezoelectric pump with cone-shaped tubes from the perspective of evolution of biological structure. The argument is discussed in the reviewed pumps one by one, and proved to be convincing. The historical argument, which is provided by the literatures, that for a valveless piezoelectric pump with cone-shaped tubes, cone angle determines the flow resistance and the flow resistance determines the flow direction. Furthermore, the function of each type of cone-shaped tubes and pump structures are analyzed, and new directions of potential expansion of valveless piezoelectric pumps with cone-shaped tubes are summarized and deduced. Firstly, the history of valveless piezoelectric pumps with cone-shaped tubes is reviewed and these pumps are classified into the following types: single pump with solid structure or plane structure, and combined pump with parallel structure or series structure. ![]() *Please use piezo aroma oil.This paper reviews the development of valveless piezoelectric pump with cone-shaped tube chronologically, which have widely potential application in biomedicine and micro-electro-mechanical systems because of its novel principles and deduces the research direction in the future. Specifications: Piezo Diffuser Solo (White), USB cable, 2 replacement oil sticks, dropper opener, 3.4 fl oz (100 ml) piezo aroma oil.Equipped with a white LED light that can be switched on and off (For Work or Relaxing) It has a 12-hour auto-off function to prevent forgotten cuts, so you can use it at the office or salon, or even before sleeping or getting sleep.3 levels of concentration settings with simple operation It can be used in a wide range of occasions such as bedrooms and conference rooms. ![]()
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