Fluid mixer

Abstract

The invention belongs to the field of microfluid driving and control, and particularly relates to a fluid mixer. Upper and lower covers are mounted on the upper and lower sides of a main mixer body, the upper cover is provided with an upper inlet and outlet valve, and the main mixer body is provided with a lower inlet and outlet valve; two drivers are in pressed connection with the interiors of driving cavities of the main mixer body through upper cover bosses, sealing rings and washers, and drivers are in pressed connection with the interiors of all mixing cavities of the main mixer body through lower cover bosses and sealing rings; the drivers and the sealing rings in the driving cavities form upper driving chambers with the upper cover and form lower driving chambers with the main mixerbody, and the upper driving chambers and the lower driving chambers are connected in series to form an upper driving unit and a lower driving unit respectively; the drivers and the sealing rings in the mixing cavities form mixing chambers with the main mixer body, and all the mixing chambers are connected in series to form a mixing unit; the upper and lower driving units are connected in paralleland then connected with the mixing unit in series; the driving frequencies of the drivers in the upper and lower driving units are the same and are not greater than a half of the excitation frequencies of the drivers in the mixing unit, the upper and lower driving units alternately or simultaneously discharge fluid, and the fluid discharged from the upper and lower driving units enters the mixingunit for multi-stage active mixing and then is discharged through outflow holes.

Description

technical field [0001] The invention belongs to the field of fluid drive and control, in particular to a fluid mixer. Background technique [0002] Fluid mixer is an indispensable key fluid control device in the fields of biochemistry, medical treatment, food, environmental monitoring and so on. Most of the original fluid mixers were passive. By setting a special geometric structure in the fluid movement path to change the flow field distribution and combine the free diffusion of fluid molecules to achieve mixing, the structure is simple, easy to manufacture and integrate, and the performance is stable. The disadvantage is that the mixing process Long, slow, and uncontrollable mixing process; in recent years, people have proposed various forms of active fluid mixers, which promote fluid mixing through external power. According to the source of power, the existing active mixers mainly include electromagnetic and pressure. There are two types of electric type, among which the...

AI Technical Summary

Problems solved by technology

Existing piezoelectric active mixers basically use a single piezoelectric vibrator as a transducer to simultaneously realize the dual functions of fluid pumping and mixing. The fluid pumping energy is limited, and it cannot be used for high fluid viscosity, large pipeline flow resistance or Occasions that require a large amount of mixed fluid delivery; in addition, the existing piezoelectric fluid mixer uses the same transducer to synchronously drive two fluids with different viscosities, that is, the fluid is sucked in through the two inlets of the same cavity at the same time, and it is impossible to accurately control the two fluids. The pumping volume of a fluid

Obviously, the driving ability, mixing effect and mixing ratio accuracy of piezoelectric fluid mixers need to be further improved.

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