Passive micro valve with constant flow output and method thereof

Abstract

The invention discloses a passive micro valve with constant flow output and a method thereof, the passive micro valve comprises an upper valve cover, a valve core, a valve body, a spring and a lower valve cover which are coaxially arranged, and a plurality of grooves with the same structure are formed in the outer side wall of an adjusting section of the valve core in the circumferential direction; a plurality of baffles which protrude towards the axis and are of the same structure are arranged on the inner side wall of the middle of the valve body in the circumferential direction, and the number of the baffles is the same as that of the grooves. The heights of the baffle bulges are gradually increased in the medium flowing direction; each groove can accommodate one baffle plate, and a gap channel for a medium to pass through can be formed between the groove and the baffle plate; the size of the gap channel can be adjusted through axial movement of the valve element, and the gap channel can be closed when the groove makes contact with the tail end of the baffle. According to the passive micro-valve, the groove in the valve element and the baffle on the valve body form the flow channel with the variable cross section, the flow resistance is correspondingly increased and decreased while the inlet pressure is increased and decreased, and it is guaranteed that when the inlet pressure exceeds a certain inlet pressure threshold value, the outlet flow of the passive micro-valve is stably output.

Description

technical field [0001] The invention belongs to the field of microfluidic flow control microvalve, in particular to a passive microvalve with constant flow output and a method thereof. Background technique [0002] As an emerging technology, microfluidics utilizes microchannels ranging in size from tens to hundreds of microns to handle tiny volumes of fluids. It has the advantages of low sample consumption and energy consumption, low cost, and high safety, and is widely used in many fields such as chemistry, biochemistry, biomedicine, and biotechnology. To achieve fluidic control and manipulation at the microscale, several major components, including microsensors, micropumps, microvalves, micromixers, and microchannels, constitute a microfluidic system. Therefore, in these components, compact and efficient microvalves are very important for accurate flow control. [0003] The precise manipulation of microfluidics is a key link in sample processing and analysis, which direc...

AI Technical Summary

Problems solved by technology

However, the existing passive valves cannot achieve fluid control with low threshold and high stable outlet flow, and it is difficult to meet the practical application requirements of portable microfluidic devices.

Images