Microfluid inertia grounding switch capable of bidirectionally identifying

Abstract

The invention discloses a microfluid inertia grounding switch capable of bidirectionally identifying. The switch comprises a substrate, a cover plate, metal liquid drops, a metal electrode and a microchannel, wherein the cover plate is arranged at an upper end of the substrate, the cover plate and the substrate are sealed, the micro channel is arranged on the substrate, the metal electrode is arranged on the cover plate, the micro channel comprises a rectangular liquid storage pool, a fan-shaped island, a diamond passage, a capillary valve, a direct-through passage and a bending passage, themetal liquid drops are arranged in the rectangular liquid storage pool, a contact at one end of the metal electrode is arranged in the micro channel, and a contact at the other end of the metal electrode is arranged outside a coincided region of the substrate and the cover plate. When an inertia force applied to the switch is larger than a threshold, the metal liquid drops can break through the capillary valve, the metal liquid drops can be completely recovered to the rectangular liquid storage pool after a backblow load and a service load are disappeared, and the switch is switched on by themetal liquid drops and the metal liquid drops cannot be recovered only under an effect of forward inertia force when a pellet rubs with ground. By the switch, an acceleration load can be bidirectionally identified, power is stably connected, and the switch has performance of working under a low-temperature environment.

Description

technical field [0001] The invention belongs to the technical field of microfluidic chips, in particular to a bidirectionally identifiable microfluid inertial switch. Background technique [0002] The microfluidic inertial switch is a new type of inertial switch proposed on the basis of microfluidic technology and new material technology. The traditional micromechanical inertial switch is generally composed of a cantilever beam and a mass-spring system, and the switch is turned on through the "solid-solid" contact of the mechanical contact; Instability and other problems reduce the reliability of the switch. The microfluidic inertial switch can effectively avoid such shortcomings. Microfluidic inertial contact 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 reach the position of the fixed signal electrode through the microchannel, and then turn on the switch. [00...

AI Technical Summary

Problems solved by technology

However, the switch also has disadvantages, such as the large width of the microchannel, resulting in a low switching threshold of about 22g; the structure of the microchannel is simple, and the switch can only be turned on under the action of inertial force, and it cannot be reliably locked after the inertial force disappears, and cannot be distinguished Environmental force; the substrate adopts PDMS porous material, which is not conducive to the long-term storage of the switch

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