MICROFLUDIC FLOW RATE REGULATOR

Abstract

A microfluidic flow rate regulator can precisely control the fluid flow rate. When direct the fluid passing through the length-adjustable annular channel with a very thin gap inside the apparatus, the resistance generated by the fluid viscosity will slowdown the fluid flow rate; by adjusting the length of the length-adjustable annular channel, also changes the sum of the resistance that generated by the fluid viscosity and changed the fluid flow rate.

Claims

1. A microfluidic flow rate regulator apparatus comprising: a spiral sleeve with fluid inlet configured to receive fluid into the apparatus and fluid outlet configured to discharge the fluid from the apparatus; a magnetically nut is screwed on the outer thread of the spiral sleeve; a polished fine core that embedded with a magnet located inside of the spiral sleeve fluid inlet; when screwing the magnetically nut to the direction of the spiral sleeve fluid outlet, the magnetically nut will attract the magnet that embedded in the polished fine core then guide the polished fine core along an axial direction to inserted into the spiral sleeve fluid outlet; at the engagement between the spiral sleeve fluid outlet inner wall and the polished fine core outer wall, will form a length-adjustable annular channel with a very thin gap for the fluid flows to pass through; when directed the fluid flows pass through the length-adjustable annular channel, the resistance generated by the fluid viscosity will slow down the fluid flow rate; when adjusting the magnetically nut positions on the outer thread of the spiral sleeve, it will attract the magnet that embedded in the polished fine core, then guide the polished fine core to adjust the depth which insert into the spiral sleeve fluid outlet, and change the length of the length-adjustable annular channel, when directed the fluid flows pass through the length-adjustable annular channel and by changing the length of the length-adjustable annular channel with a very thin gap, the sum of the resistance generated by the fluid viscosity will be changed, thereby changed the fluid flow rate; when using the different geometrical shapes of the fluid outlet inner wall and the polished fine core outer wall, it will generate the various fluid flow rate character; the magnetically nut can be made by a permanent magnet or electromagnetic coil to fit the different operation request.

2. The microfluidic flow rate regulator according to claim 1, further comprising when directed the fluid flows pass through the length-adjustable annular channel with a very thin gap, the fluid flow rate can be slow down by the resistance generated by the fluid viscosity.

3. The microfluidic flow rate regulator according to claim 1, further comprising when directed the fluid flows pass through the length-adjustable annular channel, by changing the length of the length-adjustable annular channel with a very thin gap, the sum of the resistance generated by the fluid viscosity will be changed and changed the fluid flow rate.

4. The microfluidic flow rate regulator according to claim 1, further comprising using the different cross-sectional geometrical shapes of the fluid outlet inner wall and the polished fine core outer wall to forms the different length-adjustable annular channel cross-sectional can generate the various fluid flow rate character.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be described in detail with reference to the accompanying drawings:

[0013] FIG. 1 illustrates a schematic perspective view of the microfluidic flow rate regulator according to the invention.

[0014] FIG. 2 illustrates a schematic side elevational view of the microfluidic flow rate regulator according to the invention.

[0015] FIG. 3 illustrates a schematic side cross-sectional view of the microfluidic flow rate regulator according to the invention.

[0016] FIG. 4 illustrates a schematic cross-sectional view of the length-adjustable annular channel was in the microfluidic flow rate regulator according to the invention.

[0017] FIG. 5 illustrates a schematic exploded perspective view of the microfluidic flow rate regulator according to the invention.

[0018] FIG. 6 illustrates a schematic by an example as the circular cross-section annular channel theoretical calculation formula of the microfluidic flow rate regulator according to the invention.

[0019] FIG. 7 illustrates a schematic compare the different flow rates by the examples as the different circular cross-section length-adjustable annular channel theoretical calculations results, relative to the different radius of the length-adjustable annular channel inner wall and the different length of the length-adjustable annular channel of the microfluidic flow rate regulator according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0020] An embodiment of the present invention relates to the microfluidic flow rate regulator for the precision meter of the microfluidic flow rate and the method of its fabrication.

[0021] Referring to FIG. 1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5, generally, according to the present invention, the optimal microfluidic flow rate regulator 11 comprises a spiral sleeve 12; a magnetically nut 17 is screwed on the outer thread 13 of the spiral sleeve 12; a polished fine core 19 that embedded with a magnet 22 located inside of the spiral sleeve 12 fluid inlet 18; when screwing the magnetically nut 17 to the direction of the spiral sleeve 12 fluid outlet 15, the magnetically nut 17 will attract the magnet 22 that embedded in the polished fine core 19, then guide the polished fine core 19 along an axial direction to inserted into the spiral sleeve 12 fluid outlet 15; at the engagement between the fluid outlet inner wall 16 and the polished fine core outer wall 20, will form a length-adjustable annular channel 23 with a very thin gap for the fluid flows to pass through; when directed the fluid flows pass through the length-adjustable annular channel 23, the resistance generated by the fluid viscosity will slow down the fluid flow rate.

[0022] Referring to FIG. 2 and FIG. 3, generally, according to the present invention, when adjusting the magnetically nut 17 positions on the outer thread 13 of the spiral sleeve 12, it will attract the magnet 22 that embedded in the polished fine core 19, then guide the polished fine core 19 to adjust the depth which insert into the spiral sleeve 12 fluid outlet 15, and change the length of the length-adjustable annular channel 23, which also changes the sum of the resistance generated by the fluid viscosity when the fluid flows pass through the length-adjustable annular channel 23, thereby changing the fluid flow rate.

[0023] Referring to FIG. 2, FIG. 3, FIG. 6 and FIG. 7, generally, according to the present invention, referring to the theoretical calculations results, when adjusting the magnetically nut 17 positions on the outer thread 13 of the spiral sleeve 12, the flow rate indicator 14 will be covered by the magnetically nut 17, and the flow rate indicator 14 will show of the length of the length-adjustable annular channel 23 then according to the theoretical calculations to get the fluid flow rate.

[0024] Referring to FIG. 2 and FIG. 3, generally, according to the present invention, when screwing the magnetically nut 17 to the direction of the spiral sleeve 12 fluid outlet 15 to the limitation, the sealing rubber ring 21 which on the polished fine core 19 will block the length-adjustable annular channel 23, then stop the fluid flowing out.

[0025] Referring to FIG. 3, FIG. 4, FIG. 6 and FIG. 7, generally, according to the present invention, when using the different cross-sectional geometrical shapes of the fluid outlet inner wall 16 and the polished fine core outer wall 20, it will forms the different length-adjustable annular channel 23 and generate the various fluid flow rate character.

[0026] Referring to FIG. 2 and FIG. 3, generally, according to the present invention, the magnetically nut 17 can be made by a permanent magnet or electromagnetic coil to fit the different operation request.

LIST OF REFERENCE NUMERALS

[0027] 11 microfluidic flow rate regulator [0028] 12 spiral sleeve [0029] 13 outer thread [0030] 14 flow rate indicator [0031] 15 fluid outlet [0032] 16 fluid outlet inner wall [0033] 17 magnetically nut [0034] 18 fluid inlet [0035] 19 polished fine core [0036] 20 polished fine core outer wall [0037] 21 sealing rubber ring [0038] 22 magnet [0039] 23 length-adjustable annular channel