Time-delayed inertial microfluidic power switch

Abstract

The invention discloses a time-delay inertial microfluidic power connection switch, belonging to the field of microfluidic chips, comprising a substrate, a cover plate, four metal electrodes, a microchannel and metal droplets. The cover plate is arranged at the upper end of the substrate, and sealing is formed between the cover plate and the substrate; the microchannel is formed in the substrate;and the metal electrodes are arranged on the cover plate. The microchannel comprises a J-shaped liquid reservoir, a capillary valve, a straight channel, a time-delay channel, a U-shaped blocking channel and an air guide channel. The metal droplets are located in the J-shaped liquid reservoir. One end contacts of the four metal electrodes are located in the microchannel, and the other end contactsare located outside the overlap region of the substrate and the cover plate. When the inertial force applied to the switch is greater than a threshold value, the metal droplets flow through the capillary valve to the time-delay channel for time delay, and finally flow to the metal electrodes under the action of the inertial force, and the switch is on. The time-delay inertial microfluidic power connection switch has a simple structure, a stable and reliable contact, and an accurate time-delay function compared with the existing microfluid inertial switch.

Description

technical field [0001] The invention belongs to the technical field of microfluidic chips, in particular to a time-delayed inertial microfluidic power switch. Background technique [0002] The microfluidic inertia switch is a new type of switch proposed on the basis of micromechanical inertial switch and microfluidic technology. The basic structure of a traditional micromechanical inertia switch is usually composed of a cantilever beam and a spring-mass system, and the conduction of the switch is based on "solid-solid contact". Microfluidic inertial switches generally use liquid metal as the working fluid. When the switch is subjected to an acceleration greater than its threshold, the working fluid will move to the position of the metal electrode, and then turn on the switch. The "solid-solid contact" mode of the traditional micromechanical inertia switch has the disadvantages of large on-resistance, poor anti-interference ability, unstable contact, and wear and tear of met...

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Problems solved by technology

However, this switch also has disadvantages, such as the flow mode of the working fluid of the switch is similar to jet flow, the delay time cannot be precisely controlled, and the separation of microfluidic droplets is prone to occur, which reduces the reliability of the switch.

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