A magnetostrictive double-cavity membrane micropump

Abstract

The invention discloses a magnetostrictive double-cavity membrane micropump, which belongs to the field of microfluid control. The invention is mainly composed of a magnetostrictive rod group, a sleeve, a permanent magnet, a coil frame wound with a coil, a displacement amplification mechanism, an elastic diaphragm and a pump casing. In the present invention, the upper-level rod and the lower-level rod are respectively arranged at corresponding positions in the sleeve, and the sleeve is arranged in the center through hole of the coil frame around which the coil is wound. After the coil is fed with a control current, the external magnetic field changes and the magnetostrictive rod is deformed and displaced. The amplifying mechanism is elastically deformed and its left and right semi-elliptical elastic deformations are different. The displacement amplifying mechanism squeezes the elastic diaphragms on the left and right cavities of the pump body through the stigma, and the different deformations of the elastic diaphragms cause two The volume changes of the two closed cavities are different, so that the microfluids in the two cavities can be transported in a fixed ratio. The invention has the characteristics of small volume, small flow rate, low-voltage drive, and the ability to mix and transport two liquids according to a fixed ratio.

Description

technical field [0001] Micro-flow The invention belongs to the field of micro-fluid control, and relates to a fluid delivery device capable of mixing and transporting two micro-liquids in a fixed ratio. Background technique [0002] In the field of medicine, the treatment of diseases often uses the mixed delivery of two or three liquid medicines; in addition, for diseases such as diabetes, injecting a large dose of insulin at one time not only causes waste, but also the time of drug action is short ; At the same time, the delivery of some drugs (such as cardiac drugs, vasoactive drugs) requires accuracy and stable input flow rate. That is to say, in special occasions, the rationality of the drug delivery method and dosage will affect the effect of disease treatment to a certain extent, and reasonable control of drug ratio and flow rate plays an important role in the treatment of diseases. [0003] The micropump can control the input speed to ensure the quantitative delivery...

AI Technical Summary

Problems solved by technology

Giant magnetostrictive materials have the advantages of rapid response and large strain, and are widely used in various micropumps. The existing related micropump patent CN 1908431A provides a membrane micropump driven by giant magnetostriction. The small deformation of the magnetostrictive rod acts on the elastic diaphragm through the displacement amplification mechanism, so that the elastic diaphragm causes the volume of the cavity to change, and realizes the delivery of a small amount of liquid. The shortcoming of this device is that only one-stage telescopic rod is used. Can only complete the output of a single liquid

At present, there is no report on micropumps using magnetostrictive actuators to complete the fixed ratio and mixed delivery of two trace liquids.

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