Flow Control Method of Microfluidic Induced Electroosmotic Metering Pump

Abstract

The invention relates to a flow control method for a micro fluid induction electro-osmotic metering pump, and belongs to the technical field of metering pumps. The method is characterized in that a cylindrical barrier with two half sides with different natures is inserted into the junction between a vertical pipeline and a horizontal pipeline of a T-shaped micro pipe of a micro pump, a heat type thin film mass flow sensor is arranged in the T-shaped micro pipe by adopting the MEMS technology, a flow sensing circuit is connected with a single chip by a same phase amplifying circuit in a matching way, the signal of the single chip is processed and displayed on an LCD, and the single chip is connected with an inlet of the micro pump through a voltage feedback circuit in a matching way. By the adoption of the flow control method for the micro fluid induction electro-osmotic metering pump, the application of ICEOF realizes the valveless efficient drive effect in a micro passage; the heat type thin film mass flow sensor which is arranged by adopting the MEMS technology realizes the accurate measurement of the flow in the micro passage; the reasonable peripheral flow measurement and the feedback control circuit are designed to realize the controllable output of the flow of the micro pump.

Description

technical field [0001] The invention belongs to the technical field of metering pumps, in particular to a flow control method for microfluid-induced electroosmotic metering pumps. Background technique [0002] Since the concept of a micro-total analysis system was proposed in the 1990s, microfluidic technology has developed rapidly. In recent years, with the gradual deepening of microfluidic research, the focus of microfluidic chip research has shifted to the design of microfluidic chips. The flow of microfluid is the decisive factor for the transport of detection samples between each unit. Therefore, how to realize the flow control of microfluid is the focus of microfluidic chip design. However, a good micro-pump design can ensure that the fluid is easy to control and improve the efficiency of this detection process, so designing and realizing an efficient micro-pump (Micro-pump) has become an important task in microfluidic research. In the current design of microfluidic ...

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Problems solved by technology

In the current design of microfluidic micropumps, the most successful driving method is electroosmotic driving (EOF), but electroosmotic driving still has certain shortcomings. For example, in order to ensure a good fluid driving effect in a small size, the system needs to undertake The strong electric field strength leads to the Joule heating effect, which affects the electric field and the flow field; the AC external electric field that can weaken the Joule heating effect will cause the average driving effect of the micropump to be zero; the potential of the electric double layer on the wall in electroosmosis driving is generally Less than 100mV, the transmission effect is not good enough

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