Microfluidic Negative Pressure Driven Normally Open Microvalve

Abstract

The invention discloses a normally open micro-valve driven by microfluidic negative pressure, which comprises a valve body and a valve core. In the cavity, the valve core is hollow inside, and the valve core is deformed with the pressure inside and outside the valve core. There is a negative pressure input port on the valve core. / or the output end is blocked to close the valve. In the present invention, the negative pressure signal controls the on-off of the positive pressure signal, which can bring large deformation and high output variation; it is mainly used in microfluidic chips, with higher safety and reliability, and is easy to implement in similar digital circuits. Grounding, signal gain and other functions realize various functions such as NOT gate, AND gate and OR gate, and high-level applications such as storage and oscillation of pneumatic signals can be realized through the design method of equivalent circuit.

Description

technical field [0001] The invention relates to a digital microfluidic pressure logic control chip, and mainly relates to a microfluidic negative pressure driven normally open microvalve. Background technique [0002] Digital microfluidics is a new type of pneumatic logic control technology that has emerged in recent years. With the development of modern robot systems towards bionics and flexibility, especially the emergence of pneumatic flexible actuator structures, it has wider applications. By constructing a microvalve array system with digital logic, the technology regards the microvalve as a transistor in a digital circuit, and regards the flow channel as a wire, so that the signal of the output channel can be controlled and adjusted according to the logic of the input signal, where the input signal can be It is the air pressure, and it can also be the corresponding hydraulic signal. However, its output signal has always been a negative vacuum pressure. For the current...

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Problems solved by technology

However, its output signal has always been a negative vacuum pressure. For the current pneumatic flexible actuators, the negative pressure structure cannot bring large deformation and high output variation, so special designed components are required. The negative pressure signal output by the digital microfluidic logic chip is converted into a positive pressure pneumatic or hydraulic pressure that can be directly used for flexible actuator drive

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