a fluid mixer

Abstract

The invention belongs to the field of microfluid drive and control, and in particular relates to a fluid mixer. The upper and lower covers are installed on the upper and lower sides of the main body. The upper cover is equipped with an upper inlet and outlet valve, and the main body is equipped with a lower inlet and outlet valve. There are two drivers crimped in the drive chamber of the main body through the boss of the upper cover, the sealing ring and the washer. Each of the main body The drive chamber is crimped with the driver through the boss of the lower cover and the sealing ring; the driver and the sealing ring in the driving chamber form the upper driving chamber with the upper cover, and form the lower driving chamber with the main body. The upper and lower driving chambers are respectively connected in series to form the upper and lower driving units. ;The driver and sealing ring in the mixing chamber and the main body constitute a mixing chamber, and each mixing chamber is connected in series to form a mixing unit; the upper and lower driving units are connected in parallel and then connected in series with the mixing unit; the driving frequency of the drivers in the upper and lower driving units is the same and not greater than that of the driver in the mixing unit One-half of the excitation frequency, the upper and lower driving units discharge fluid alternately or simultaneously, and the fluid discharged from the upper and lower driving units enters the mixing unit for multi-stage active mixing and then is discharged through the outlet hole.

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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