Pneumatic precision micropump

Abstract

The invention relates to a pneumatic precision micropump, which comprises a pneumatic module, a check valve group, a liquid storage module and a flow regulation module. The pneumatic module comprisesan air bag; the check valve group comprises a first check valve and a second check valve, an inlet of the first check valve is communicated with the external atmosphere while an outlet is communicatedwith the air bag, and an inlet of the second check valve is communicated with the air bag while an outlet is communicated with the liquid storage module; the liquid storage module comprises a cavityand a liquid storage pool, the cavity and the liquid storage pool are spaced through a first elastic diaphragm, the cavity is a closed cavity, and the liquid storage pool is connected with the air bagthrough the second check valve; the flow regulation module comprises a first flow passage and a second flow passage, the first flow passage and the second flow passage are both communicated with theliquid storage pool, an outlet of the first flow passage is closed, an outlet of the second flow passage is communicated with the outside of the flow regulation module, and the first flow passage andthe second flow passage are spaced through a second elastic diaphragm. The pneumatic precision micropump has advantages of low starting pressure, stability in fluid delivery, small size, easiness in integration and the like, and microfluid stable driving and control demands are met.

Description

technical field [0001] The invention relates to the field of microfluidic chips, in particular to a precision micropump driven by air pressure. Background technique [0002] The continuous, stable and precise injection of sample liquid is an essential key link in the microfluidic system, and the accuracy and stability of microfluidic transport directly affect the functional performance of the microfluidic chip. At present, commercial instruments (such as precision syringe pumps, precision air pumps, etc.) are still the most frequently used microfluidic control means in microfluidic experiments and applications. Utilizing sophisticated sensing devices and mechanical and electronic controls, such instruments can achieve very precise microfluidic actuation and control. However, considering the high price and bulky volume, such instruments are not suitable for integrating low-cost, portable microfluidic systems. [0003] In order to achieve low-cost and precise microfluidic co...

AI Technical Summary

Problems solved by technology

It can be seen from the design functions of micropumps and microvalves that micropumps are mainly used as fluid-driven power sources and cannot achieve precise fluid control; while microvalves are used for fluid motion control and do not have the ability to drive fluids.

For the research of micropumps and microvalves, the current focus is mainly on the functional design and extended application of these two devices, and the organic integration of these two devices to achieve a micropump system with both fluid drive and precise control is rarely achieved. There are reports

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