CN213116582U

CN213116582U - Control structure of micro-fluidic chip

Info

Publication number: CN213116582U
Application number: CN202020695886.7U
Authority: CN
Inventors: 彭兴跃
Original assignee: Xiamen Qiyue Electronic Technology Co ltd
Current assignee: Xiamen Qiyue Electronic Technology Co ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2021-05-04
Anticipated expiration: 2030-04-30

Abstract

The utility model discloses a control structure of a micro-fluidic chip, which comprises a spherical magneton with a clear NS pole, a rectangular magnetic sheet with a clear NS pole and a driving coil; the spherical magneton is arranged in the fluid containing cavity, the rectangular magnet piece and the driving coil are arranged outside the fluid containing cavity, and the rectangular magnet piece is flatly placed in the inner ring surface of the driving coil. The utility model discloses utilize square wave current to produce the rectangle magnet piece swing that changes the magnetic field and drive strong magnetism to drive spherical magneton vibration with stronger swing magnetic field, through the vibration of spherical magneton under different passageway conditions, realize fluidic different flow directions. The utility model discloses whole size is steerable within 1cm, and is small, with low costs, but has expansibility and integrability, but wide application in fields such as chemistry, life science, environmental science, medical health.

Description

Control structure of micro-fluidic chip

Technical Field

The utility model relates to a micro-fluidic field especially relates to a micro-fluidic chip's control structure.

Background

The micro-fluidic chip adopts a micro-electro-mechanical processing technology similar to a semiconductor to construct a micro-channel system on the chip, transfers the experiment and analysis process to a chip structure consisting of a path and a small liquid-phase chamber which are mutually connected, loads a biological sample and a reaction liquid, and drives the flow of a buffer solution in the chip by adopting methods such as a micro-mechanical pump, an electric hydraulic pump, electroosmosis flow and the like to form a micro-channel so as to perform one or continuous multiple reactions on the chip.

There are many different ways of classifying micropumps: according to the existence of the movable valve plate, the valve-type micro pump and the valveless micro pump can be divided; the driving method may be a piezoelectric type, an electrostatic type, a pneumatic type, a thermal driving type, or the like. The valved micropump generally works by utilizing the periodic change of the cavity volume and a one-way valve, has a simple principle, is mature in manufacturing process and easy to control, and is the mainstream of the prior application. However, because of the existence of mechanical parts such as the valve plate and the like in the pump body, the problems of fatigue and service life of the valve plate are always difficult to be troubled by researchers, and the application range of the valve plate is greatly limited; further, the process and process accuracy of these mechanically movable parts limit further miniaturization of valved micropumps and do not meet the technological requirements of microfluidic chips that have been rapidly developed in recent years. Compared with a valve micropump, the valveless micropump has unique development advantages and wide application prospect due to the novel principle, relatively simple structure, low requirement on manufacturing process and suitability for miniaturization.

Patent 201310378611.5 proposes "a travelling wave valveless micropump based on the coordinated driving of rotating micro magnetic arrays", which utilizes the interaction of two sets of micro magnetic arrays to generate four standing waves with the same amplitude, frequency and vibration direction and 90-degree phase difference on the pipeline, and because the four standing waves can be synthesized into a travelling wave on the micro-flow pipeline, the liquid in the pipeline flows along the travelling wave direction. Two groups of miniature magnet arrays respectively comprise four annular magnets and cylindrical magnets, wherein the annular magnets are 2mm high in size, 1mm in diameter and 2.3mm in outer diameter, and the cylindrical magnets are 2mm high in size and 1mm in diameter. The size of the motor is 6mm in diameter and 14mm in length. The whole size of the whole micro-flow pump is about 3cm, the volume is larger, and the micro-flow pump is not suitable for the finer micro-flow control field.

SUMMERY OF THE UTILITY MODEL

The utility model provides a control structure of a micro-fluidic chip to realize the simplest driving structure of micro-fluid.

The utility model provides a technical problem can adopt following technical scheme to realize:

a control structure of a micro-fluidic chip is characterized in that: comprises a spherical magnet with a definite NS pole, a rectangular magnet piece with a definite NS pole and a driving coil; the spherical magnetons are arranged in the fluid containing cavity, the rectangular magnet pieces and the driving coils are arranged outside the fluid containing cavity, and the rectangular magnet pieces are flatly placed in the inner ring surface of the driving coils.

Preferably, the spherical magnet is placed in a microchip with a circulation channel, the driving coil and the rectangular magnet piece are arranged outside the circulation channel, the driving coil is connected with external audio output equipment through an audio line, and audio input by the audio line is square wave input.

The utility model discloses utilize audio frequency square wave electric current to produce the rectangle magnet piece swing that changes the magnetic field and drive strong magnetism to drive spherical magnon vibration with stronger swing magnetic field, through the vibration of spherical magnon under different passageway conditions, realize fluidic different flow directions. The utility model discloses whole size is steerable within 1cm, and is small, with low costs, but has expansibility and integrability, but wide application in fields such as chemistry, life science, environmental science, medical health.

Drawings

Fig. 1 is a schematic diagram of the basic structure of the present invention.

Fig. 2 is a schematic diagram of the movement of the magnet when the magnet is rotated clockwise.

FIG. 3 is a schematic diagram showing the movement of the magnets when the magnets rotate counterclockwise,

Fig. 4 is a schematic diagram of the movement of the magnet and the magneton under a square wave current.

Fig. 5 is a schematic physical diagram of embodiment 1 of the present invention.

Fig. 6 is a schematic diagram of the placement of a transducer within a fluid.

Fig. 7 is a schematic illustration of slow vibration with magnetons suspended in a fluid (i.e., without a boundary).

Fig. 8 is a schematic diagram of the fast vibration of the magnetons under borderless conditions.

Fig. 9 is a schematic view of a flow field of a vibrator vibrating rapidly along a vertical single boundary direction.

Fig. 10 is a schematic view of a flow field with a vibrator rapidly vibrating at corner boundary locations in a direction parallel to a vertical boundary.

Fig. 11 is a schematic view of a flow field of a vibrator vibrating rapidly perpendicular to a single boundary direction.

Fig. 12 is a schematic view of the flow field of 1 transducer.

Fig. 13 is a schematic view of superposition of two oscillator flow fields.

Fig. 14 is a schematic view of the superposition of flow fields of 3 vibrators.

Fig. 15 is a schematic view of the superposition of flow fields of 4 vibrators.

Fig. 16 is a schematic diagram of the structure of the microfluidic chip for audio input.

In the figure, 1 spherical magnet, 2 rectangular magnet pieces, 3 driving coils, 4 partition walls, 5 circulation channels and 6 audio cables.

Detailed Description

The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.

Fig. 1 to 16 are preferred embodiments of the present invention, which is a micro-flow pump for driving a fluid in a chamber, and includes a spherical magnet 1 having a definite NS pole, a rectangular magnet piece 2 having a definite NS pole, and a driving coil 3; the spherical magneton 1 is placed in the fluid cavity, the rectangular magnet piece 2 and the driving coil 3 are used as driving bodies and are arranged outside the fluid cavity, namely, a partition wall 4 (also called a boundary) is arranged between the rectangular magnet piece 2 and the driving coil 3 and the spherical magneton 1. The spherical magneton 1 can be adsorbed on the nearest inner wall of the cavity by the rectangular magnet piece 2, and the spherical magneton 1 can be suspended in the fluid when the buoyancy is fixed. The rectangular magnet piece 2 is laid on the inner ring surface of the driving coil 3, and the driving coil 3 has the capability of driving the rectangular magnet 2 to rotate or swing. Fig. 5 is an entity's sketch map of a specific embodiment of the utility model, spherical magnon 1, rectangle magnet piece 2 and drive coil 3 are the market purchase, what this embodiment adopted is that the diameter is 2 mm's spherical magnon 1, length is 4.5 mm's rectangle magnet piece 2, and the inner circle is wide 5mm, length is 3 mm's drive coil 3, put into drive coil 3 with rectangle magnet piece 2, the whole size of whole experimental apparatus is no longer than 1cm, the volume of than other micropumps reduces greatly. The spherical magnet 1, the rectangular magnet piece 2 and the driving coil 3 can be applied to the application and need to be expanded in size.

After the driving coil 3 is electrified, the positions of the N pole and the S pole of the rectangular magnet piece 2 are changed by adjusting the current, so that the position of the spherical magnet 1 is changed, and when the driving coil 3 is electrified in the forward direction by taking the center of the rectangular magnet piece 2 as a swinging fulcrum, N-level of the rectangular magnet piece 2 swings clockwise towards the spherical magnet 1 as shown in fig. 1-4; when the driving coil 3 is electrified reversely, the S-level magnetic iron 1 swings counterclockwise; when the input current of the driving coil 3 is square wave current, the rectangular magnet piece 2 swings regularly with the center as a pivot, and the change of the magnetic force causes the spherical magnet 1 on the other side of the partition wall 4 to reciprocate in the direction parallel to the rectangular magnet piece 2.

Flow fields generated by the spherical magneton 1 through vibration under various boundary conditions are shown in fig. 6-11, and it can be seen that 4 vortices (fig. 7 and 8) are generated in the flow field around the vibrator when no boundary exists (namely, the vibrator is located in the fluid), while 2 vortices are generated in the flow field around the vibrator when a single boundary exists, the vibration directions are different, the vortex shapes are different, as shown in fig. 9 and 11, when the vibrator is located on an angular boundary, the vortex flow field formed is small, as shown in fig. 10, and is influenced by the partition wall 4.

Because the volume of the spherical magnetons 1 is small, one vibrator pump only needs 0.248mW of energy at minimum, and only needs less than 1mW of power to drive 4 spherical magnetons to vibrate, the embodiment adopts sound waves as a driving source, and designs a double-pump microchip which is connected with external audio output equipment, as shown in fig. 16, the microchip is provided with an internal circulation channel 5, liquid is filled in the circulation channel 5, the chip is installed in the middle of a double-pump plastic driver in a hand mirror shape and is provided with a 3.5 mm audio jack, two spherical magnetons 1 are placed in the circulation channel 5, two driving coils 3 (containing rectangular magnet pieces 2) are placed outside the circulation channel 5 close to the two spherical magnetons 1, as shown in fig. 16, the two spherical magnetons 1 are placed on the left side and the right side of the circulation channel 5, and a left pump and a right pump are manufactured. The drive coils of the left and right pumps are directly connected to the left and right channels of the external audio output respectively, and when stereo music is played, the left or right electric audio signals respectively reach the left or right pumps through the 3.5 mm audio cable 6. The two vibrator pumps are equivalent to two earphones, and the audio output file is changed into a square wave file, so that effective driving can be realized.

The utility model discloses utilize oscillator drive microfluid, the oscillator drive is through the oscillator of localization vibration, produces the malleation in the axis direction of vibration, produces the negative pressure in all directions on rather than the plane of vibration axis quadrature to drive fluid motion. The audio frequency square wave is utilized to generate a variable magnetic field to drive the strong magnetic rectangular magnet piece 2 to swing, so that the stronger swing magnetic field drives the spherical magnet 1 to vibrate, and the vibrator vibration action is completed. The utility model discloses a totally enclosed non-contact utilizes magnetic field to control vibrator vibration or the rotor rotation, and this is the first-selected mode that pierces through the partition wall and carry out control, can select spherical magnon 1 according to operating temperature, can normally work under the adverse circumstances condition of very high temperature.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments still belong to the protection scope of the present invention.

Claims

1. A control structure of a micro-fluidic chip is characterized in that: comprises a spherical magnet with a definite NS pole, a rectangular magnet piece with a definite NS pole and a driving coil; the spherical magnetons are arranged in the fluid containing cavity, the rectangular magnet pieces and the driving coils are arranged outside the fluid containing cavity, and the rectangular magnet pieces are flatly placed in the inner ring surface of the driving coils.

2. The control structure of a microfluidic chip according to claim 1, wherein: the spherical magnetons are placed in a microchip with a circulation channel, the driving coil and the rectangular magnet piece are arranged outside the circulation channel, the driving coil is connected with external audio output equipment through an audio line, and audio input by the audio line is square wave input.