Shape memory alloy micro valve based on acoustic surface waves and control method of shape memory alloy micro valve

A technology of memory alloy and surface acoustic wave, which is applied to valve devices, engine components, mechanical equipment, etc., can solve problems such as difficult circuits, difficult application of piezoelectric microfluidic devices, and high current of aluminum wires, and achieves simple structure and small volume , easy-to-integrate effects

Active Publication Date: 2016-12-21
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the generation of sufficient Joule heat, the current generated by the aluminum wire is required to be large, so it is difficult to

Method used

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  • Shape memory alloy micro valve based on acoustic surface waves and control method of shape memory alloy micro valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of shape memory alloy microvalve based on surface acoustic wave proposed in this embodiment, such as figure 1 As shown, it includes a PCB board 1, a surface acoustic wave excitation device 7, a PDMS solidified body 2 with a microchannel 21, a shape memory alloy wire 3, and the shape memory alloy wire 3 is a first section that is slightly bent at room temperature made of one piece The shape memory alloy wire 31 is composed of the second straight shape memory alloy wire 32 at room temperature, the surface acoustic wave excitation device 7 and the PDMS solidified body 2 are installed on the PCB board 1, and one side of the PDMS solidified body 2 is provided with a Groove 22, the other end of the first section of shape memory alloy wire 31 is connected to the PCB board 1, the first section of shape memory alloy wire 31 is across the propagation path of the surface acoustic wave excited by the surface acoustic wave excitation device 7, and the second A section of shap...

Embodiment 2

[0047] This embodiment proposes the control method of the SAW-based shape memory alloy microvalve of Embodiment 1, which includes the following steps:

[0048] ① Place the paraffin oil micro-liquid on the propagation path of the surface acoustic wave excited by the surface acoustic wave excitation device.

[0049] ② When the signal generator and power amplifier are not activated, and the surface acoustic wave excitation device does not excite the surface acoustic wave, the shape memory alloy microvalve is in the open state, and the digital microfluidics can pass through the PDMS solidified body under the action of the external sampler. Transport in microchannels;

[0050] The control process of the shape memory alloy microvalve from the open state to the closed state is: start the signal generator and the power amplifier; the signal generator outputs the RF electric signal, and transmits the RF electric signal to the power amplifier; the amplified RF electric signal output by ...

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Abstract

The invention discloses a shape memory alloy micro valve based on acoustic surface waves and a control method of the shape memory alloy micro valve. The shape memory alloy micro valve comprises a PCB, an acoustic surface wave excitation device, a PDMS coagulating body with a micro-channel and a shape memory alloy line formed by a first crooked section at the indoor temperature and a second straight section at the indoor temperature; the acoustic surface wave excitation device and the PDMS coagulating body are installed on the PCB, a groove is formed in the PDMS coagulating body, and the other end of the shape memory alloy line is connected with the PCB; the section, stretching across a propagation path of the acoustic surface waves excited by the acoustic surface wave excitation device and located on the propagation path, of the shape memory alloy line is covered with paroline micro liquid on the propagation path; and the second section of the shape memory alloy line is sleeved with a guide pipe connected with the PCB, and a plastic sheet is connected to the other end of the second section of the shape memory alloy line and extrudes a part, located between the groove and the micro-channel, of the PDMS coagulating body and the under pushing force to deform so as to block the micro-channel. The shape memory alloy micro valve has the beneficial effects of being simple in structure, small in size and easy to integrate.

Description

technical field [0001] The invention relates to a microvalve for controlling microfluid transport in a microfluidic chip and its control technology, in particular to a surface acoustic wave-based shape memory alloy microvalve and a control method thereof. Background technique [0002] Compared with conventional laboratory biochemical analysis, microfluidic chip technology has achieved rapid development since its invention and has been widely used in DNA sequencing, protein analysis, single cell analysis, drug detection and food safety and other fields. [0003] When microfluidic chips are used for microfluidic analysis, there are two working modes of microfluidics, namely digital flow and continuous flow. Among them, in the microfluidic analysis of the continuous flow working mode, the continuous flow microfluid is transported and reacted in the microchannel. For this reason, a microvalve is needed to control the flow direction of the continuous flow microfluid in the micr...

Claims

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Application Information

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IPC IPC(8): F16K99/00
CPCF16K99/0021F16K99/0038F16K99/0042F16K2099/0084
Inventor 刘尉悦汤煜金标吴腾钟先锋章安良
Owner NINGBO UNIV
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