A helical disk free combination type micro-mixer and a method for using the same

Abstract

The application discloses a spiral disc free combination type micro-mixer and a use method thereof, which comprises a fixed base, a left spiral disc and a right spiral disc are arranged on a mixing end of the fixed base, the number of the left spiral disc and the right spiral disc is greater than or equal to 1, spiral grooves are arranged on the left spiral disc and the right spiral disc, the spiral directions of the spiral grooves on the left spiral disc and the right spiral disc are opposite, and the width of the spiral grooves gradually decreases or gradually increases from a spiral starting position to a spiral ending position; the whole device is convenient to disassemble and assemble, the volume of the device can be better controlled by adjusting the number of the left spiral disc and the right spiral disc, one device can be used as a device with different volumes, the mixing effect is ensured, the pressure drop is not large, and the design idea of the bidirectional spiral groove can avoid a large amplification effect.

Description

Technical Field

[0001] This invention relates to a spiral disc freely combinable micromixer and its method of use. Background Technology

[0002] The mixing effect of micromixers and microreactors is related to the size of the microchannels; generally, the smaller the microchannel size, the better the mixing effect. However, small microchannel sizes can lead to higher pressure drops and cause clogging problems in microreactors. Therefore, detachable microreactors will become the mainstream to avoid these clogging issues. Currently, most detachable microreactors on the market involve multiple disassembly and reassembly processes, which are time-consuming and inconvenient. Furthermore, the mixing unit structure within microreactors is simple, making it difficult to adjust and replace internal mixing units according to actual conditions. The process adaptability of existing microreactors is insufficient to meet personalized design requirements, resulting in insufficient flexibility and limited applicability in actual production or process development.

[0003] Patent CN113901739A discloses a method and system for measuring the mixing effect of a mathematical spiral structure mixer. This invention includes: constructing three different spiral micromixers based on Archimedes' spiral, Fermat's spiral, and hyperbolic spiral structures; measuring the mixing effect of the three different spiral micromixers using experimental and simulation strategies; summarizing their mixing mechanisms; integrating the Fermat spiral mixer into a microfluidic chip; and applying it to the detection of disease biomarkers. This invention can measure the mixing effect of different mathematical spiral structure micromixers and summarize the mechanism of this type of mixer; it can be used for mixing low Reynolds number fluids, has a simple structure, high mixing efficiency, and low cost; when the Fermat spiral structure micromixer is integrated into a cTnI detection chip, it uses a double-antibody sandwich method based on the immunoassay principle, suitable for the detection of most biomarkers, meeting the diagnostic needs of many such diseases, and possessing wide applicability; the integration of this mixer shortens the detection time to 10 minutes and provides high detection sensitivity.

[0004] However, the above-mentioned method and system for measuring the mixing effect of a mathematical spiral structure mixer has the following drawbacks when in use: 1. Due to the complex structure of its micro-mixer, it is inconvenient to disassemble and reassemble, and the residence volume of the mixer cannot be freely adjusted; 2. The mixing method of the above-mentioned micro-mixer will generate a relatively large pressure drop, and it cannot guarantee the same mixing effect as the low-throughput mixer when the module is scaled up. Summary of the Invention

[0005] The purpose of this invention is to provide a spiral disk free-combination micromixer and its usage method to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A fixed base is included, wherein the mixing end of the fixed base is provided with a left spiral disc and a right spiral disc, and the number of both the left and right spiral discs is greater than or equal to 1. Both the left and right spiral discs are provided with spiral grooves, and the spiral directions of the spiral grooves on the surfaces of the left and right spiral discs are opposite. The width of the spiral grooves gradually decreases or gradually increases from the starting position to the ending position of the spiral. The fixed end of the fixed base is provided with a mixer cover plate capable of fixing the left and right spiral discs to the fixed base, and the mixer cover plate is provided with a mixer outlet capable of drawing out the mixture.

[0007] Preferably, the liquid input end of the fixed base surface is symmetrically provided with a mixer inlet one and a mixer inlet two, and the output ends of the mixer inlet one and the mixer inlet two are provided with inlet channels, and the inlet channels are symmetrically arranged at the mixing end of the fixed base.

[0008] Optionally, the mixer inlet and the corresponding inlet channel can be disposed on a fixed base or on one side of the mixer cover plate.

[0009] Preferably, the spiral groove has an inlet at the beginning of the spiral and an outlet at the end of the spiral. The inlets on the spiral grooves of the left and right spiral discs are respectively located on the two corresponding inlet channels. The mixer outlet has an outlet channel, and the outlet is correspondingly located on the outlet channel.

[0010] Preferably, the width of the spiral groove gradually decreases from the beginning to the end of the spiral and the width shrinkage rate is 15-85% per 360°, or the width of the spiral groove increases from the beginning to the end of the spiral and the width expansion rate is 60-600% per 360°. The widths of the inlet and outlet are both greater than 0, and the sum of the spiral angles from the inlet to the outlet of the spiral groove is a multiple of 180° and not less than 540°.

[0011] Preferably, the diameter of the inlet is the same as the diameter of the inlet channel, the diameter of the outlet is the same as the diameter of the outlet channel, and the ratio of the diameter of the outlet channel to the diameter of the inlet channel is 1:2-2:1.

[0012] Preferably, the ratio of the spiral groove depth to the radius of the left or right spiral disc is 1:20-1:100, and the ratio of the spiral groove depth to the inlet channel diameter is 2:1-1:10.

[0013] Preferably, the contact surfaces of the fixed base and the mixer cover plate with the left or right spiral disc are made of thermally conductive material, and a medium heat exchanger is provided inside.

[0014] Preferably, the fixed base, the left spiral disc, and the right spiral disc are all provided with positioning holes arranged in a circular pattern on their surfaces, and the mixer cover plate is provided with a fixing rod at a position corresponding to the positioning holes.

[0015] Preferably, the fixed base, mixer cover plate, left spiral disc and right spiral disc are mutually pressed together to form a sealing structure, and the mixer cover plate is provided with a connecting channel, which is located at the mixer outlet.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The overall design, through the cooperation of the fixed base, fixed rod and mixer cover, makes disassembly relatively convenient and allows for better adjustment of the number and size of the left and right spiral discs;

[0018] 2. Adjusting the number of left and right spiral discs can better control the volume of fluids remaining inside the device, allowing one device to be used as a device of different volumes. At the same time, the variation in the width of the spiral groove and the counter-current of the spiral direction help to improve the mixing effect of the two fluids.

[0019] 3. In processes where the viscosity of materials gradually increases during the reaction process, the pressure drop of the overall mixer can be kept within a reasonable range. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0021] Figure 2 This is a side view structural diagram of an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the overlapping of the left and right spiral disks after stacking, according to an embodiment of the present invention.

[0023] Figure 4 These are perspective and cross-sectional views of the left and right spiral disks according to an embodiment of the present invention.

[0024] Figure 5 This is a disassembled schematic diagram of the entire device according to an embodiment of the present invention.

[0025] In the diagram: 1. Fixed base; 2. Mixer inlet 1; 3. Mixer inlet 2; 4. Mixer cover plate; 5. Positioning hole; 6. Inlet channel; 7. Outlet channel; 8. Connecting channel; 9. Fixing rod; 10. Left spiral disc; 11. Right spiral disc; 12. Liquid inlet; 13. Liquid outlet; 14. Mixer outlet; 15. Spiral groove. Detailed Implementation

[0026] To address the problem that existing integrated structures are relatively fixed and cannot be adjusted according to actual conditions, this invention provides a spiral disc freely combinable micromixer and its usage method. The technical solution of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described invention is only a part of this invention, not all of it. Based on the invention described herein, all other inventions obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

[0027] The above-mentioned method of using a spiral disc freely combinable micromixer includes the following steps:

[0028] Step A, Preparation: Select the appropriate number and specifications of left-hand spiral discs 10 and right-hand spiral discs 11 according to the properties of the liquid to be mixed and the process requirements;

[0029] Step B, Assembly: Align the liquid inlet 12 on the left spiral disc 10 with one of the inlet channels 6 on the fixed base 1, and align the liquid inlet 12 on the right spiral disc 11 with the other inlet channel 6 on the fixed base 1. After stacking them according to the preset method, cover the mixer cover plate 4, adjust all the left spiral discs 10 and right spiral discs 11 so that their liquid outlets 13 correspond to the positions of the outlet channels 7 of the mixer cover plate 4, insert the fixing rod 9, and lock the fixed base 1, mixer cover plate 4, left spiral disc 10 and right spiral disc 11 together.

[0030] Step C, fluid transfer: Connect mixer inlet 2 and mixer inlet 3 to the liquid to be mixed respectively, and connect mixer outlet 14 to an external collection device. The liquid is delivered to the two inlet channels 6 through mixer inlet 2 and mixer inlet 3. When stacked, due to the installation direction of the left spiral disc 10 and the right spiral disc 11, and the contact surface of the spiral groove 15 on the surface of the left spiral disc 10 and the right spiral disc 11, there are boundary gaps except for partial overlap. The liquid is transferred layer by layer through the gaps.

[0031] Step D, Mixing: Under the action of the spiral grooves 15 on the surfaces of the left spiral disk 10 and the right spiral disk 11, the two fluids flowing in can cross along the spiral grooves 15, thereby generating vortices to achieve mixing and enhance mass transfer.

[0032] Step E, Replacement: When it is necessary to control the volume of fluid remaining inside, simply remove the fixing rod 9 and reinstall it by changing the number and specifications of the left spiral disc 10 and the right spiral disc 11.

[0033] The specific calculation formulas for width shrinkage rate and width expansion rate proposed in the instruction manual are as follows:

[0034] Shrinkage rate of spiral groove width 15 per week (360°) = [(inlet 12 width - outlet 13 width) / inlet 12 width / (sum of spiral angles from inlet 12 to outlet 13 / 360)] x 100%

[0035] Weekly (360°) spiral groove width expansion rate 15 = [(outlet port 13 width - inlet port 12 width) / inlet port 12 width / (sum of spiral angles from inlet port 12 to outlet port 13 / 360)] x 100%

[0036] The specific implementation follows the steps described above, and several commonly used specifications of left-hand spiral disks 10 and right-hand spiral disks 11 are selected for the description of the implementation:

[0037] Example 1

[0038] Embodiment 1 of the present invention describes the type and stacking quantity of the spiral disks on the surfaces of the left spiral disk 10 and the right spiral disk 11, as well as their effects:

[0039] The radius of both the left spiral disc 10 and the right spiral disc 11 is 25mm. The sum of the spiral angles from the inlet 12 to the outlet 13 of the spiral groove 15 on the left spiral disc 10 and the right spiral disc 11 is 900°. The distance from the inlet 12 to the outlet 13 is 0.8 times the radius of the entire disc. The spiral groove 15 has a spiral groove depth of 0.25mm. The width of the inlet 12 is 0.5mm, which is consistent with the diameter of the inlet channel. The width of the outlet 13 is 0.05mm. The diameter of the outlet channel 7 is 0.5mm. The shrinkage rate of the spiral groove 15 per 360° is 36%. The material is 316L stainless steel.

[0040] The default fixed base 1 and the mixer cover plate 4 have the same cylindrical cross-section. The micro mixer is integrated by combining the aforementioned left spiral disc 10 and right spiral disc 11. The liquid inlet 12 of the left spiral disc 10 is aligned with the left inlet channel 6 on the fixed base 1, and the right spiral disc 11 is aligned with the right inlet channel 6 on the fixed base 1. The liquid outlets 13 on both the left spiral disc 10 and the right spiral disc 11 are aligned with the center position of the fixed base 1. The installation is completed by fixing with the fixing rod 9. The integrated micro mixer M1 can meet the requirement of no significant pressure drop in the total flow range of 0~50mL / min (pure water as the medium). After the system is fixed and sealed, it can meet the requirement of no leakage at a pressure drop of 2MPa. The mixer inlet is 1 / 16” and the outlet is 1 / 8”.

[0041] Example 2

[0042] Embodiment 2 of the present invention describes the type and stacking quantity of the spiral disks on the surfaces of the left spiral disk 10 and the right spiral disk 11, as well as their effects:

[0043] The radius of both the left spiral disc 10 and the right spiral disc 11 is 50 mm. The sum of the spiral angles from the inlet 12 to the outlet 13 of the spiral groove 15 on the left spiral disc 10 and the right spiral disc 11 is 540°. The distance from the inlet 12 to the outlet 13 is 0.6 times the radius of the entire disc. The spiral groove 15 has a spiral groove depth of 0.75 mm. The inlet 12 has a width of 1 mm. The inlet channel 6 has a diameter of 0.5 mm. The outlet 13 has a width of 0.1 mm. The outlet channel 7 has a diameter of 0.5 mm. The shrinkage rate of the spiral groove 15 per 360° is 60%. The material is Hastelloy HC276.

[0044] The default fixed base 1 and the mixer cover plate 4 have the same cylindrical cross-section. The micro mixer is integrated by combining the above-mentioned two left-hand spiral discs 10 and one right-hand spiral disc 11, with the stacking order being LRL (in this embodiment, L represents the left-hand spiral disc 10 and R represents the right-hand spiral disc 11). The liquid inlet 12 of the left-hand spiral disc 10 is aligned with the left inlet channel 6 on the fixed base 1, and the right-hand spiral disc 11 is aligned with the right inlet channel 6 on the fixed base 1. The liquid outlets 13 on the left-hand spiral disc 10 and the right-hand spiral disc 11 are aligned with the center position of the fixed base 1. The installation is completed by fixing with the fixing rod 9. The integrated micro mixer M2 can meet the requirement of a total flow rate of 0~100mL / min without significant pressure drop (pure water as the medium). After the system is fixed and sealed, it can meet the requirement of 5MPa pressure drop without leakage. The mixer inlet is 1 / 8” and the outlet is 1 / 8”.

[0045] Example 3

[0046] Embodiment 3 of the present invention describes the type and stacking quantity of the spiral disks on the surfaces of the left spiral disk 10 and the right spiral disk 11, as well as their effects:

[0047] The radius of both the left spiral disc 10 and the right spiral disc 11 is 24 mm. The sum of the spiral angles from the inlet 12 to the outlet 13 of the spiral groove 15 on the left spiral disc 10 and the right spiral disc 11 is 720°. The distance from the inlet 12 to the outlet 13 is 0.5 times the radius of the entire disc. The spiral groove 15 has a spiral groove depth of 0.3 mm. The inlet 12 has a width of 0.8 mm. The inlet channel 6 has a diameter of 0.4 mm. The outlet 13 has a width of 0.05 mm. The outlet channel 7 has a diameter of 0.4 mm. The shrinkage rate of the spiral groove 15 per 360° is 46.9%. The material is polytetrafluoroethylene.

[0048] The default fixed base 1 and the mixer cover plate 4 have the same cylindrical cross-section. The micro mixer is integrated by combining the above-mentioned two left-hand spiral discs 10 and two right-hand spiral discs 11, with the stacking order being LLRR. The liquid inlet 12 of the left spiral disc 10 is aligned with the left inlet channel 6 on the fixed base 1, and the right spiral disc 11 is aligned with the right inlet channel 6 on the fixed base 1. The liquid outlets 13 on the left spiral discs 10 and right spiral discs 11 are aligned with the center position of the fixed base 1. The installation is completed by fixing with the fixing rod 9. The integrated micro mixer M3 can meet the requirement of a total flow rate of 0~150mL / min without producing a significant pressure drop (pure water as the medium). After the system is fixed and sealed, it can meet the requirement of 3MPa pressure drop without leakage. The mixer inlet is 1 / 8” and the outlet is 1 / 4”.

[0049] Example 4

[0050] Embodiment 4 of the present invention describes the type and stacking quantity of the spiral grooves on the surfaces of the left spiral disk 10 and the right spiral disk 11, as well as their effects:

[0051] The radii of the left spiral disc 10 and the right spiral disc 11 are both 100mm. The sum of the spiral angles from the inlet 12 to the outlet 13 of the spiral groove 15 on the left spiral disc 10 is 1080°, and the distance from the inlet 12 to the outlet 13 is 0.75 times the overall disc radius. The spiral groove 15 has a spiral groove depth of 1.2mm and its width gradually decreases from the outer periphery to the center. The inlet diameter is 1.5mm, the inlet 12 width is 1.5mm, the outlet 13 width is 0.25mm, the outlet diameter is 1.5mm, and the spiral groove 15 width shrinkage rate is 27.8% per 360°. The material is 316L stainless steel.

[0052] The sum of the spiral angles from the inlet 12 to the outlet 13 of the spiral groove 15 on the right spiral disc 11 is 1080°, and the distance from the inlet 12 to the outlet 13 is 0.75 times the radius of the entire disc. The spiral groove 15 has a spiral groove depth of 1.2 mm and its width gradually increases from the outer periphery to the center. The diameter of the inlet channel is 1.5 mm. The width of the inlet 12 is 0.25 mm, the width of the outlet 13 is 1.5 mm, the diameter of the outlet channel 7 is 1.5 mm, and the width expansion rate of the spiral groove 15 per 360° is 166.7%. The material is 316L stainless steel.

[0053] The default fixed base 1 and the mixer cover plate 4 have the same cylindrical cross-section. The micro mixer is integrated by combining the aforementioned left spiral disc 10 and right spiral disc 11. The liquid inlet 12 of the left spiral disc 10 is aligned with the left inlet channel 6 on the fixed base 1, and the right spiral disc 11 is aligned with the right inlet channel 6 on the fixed base 1. The liquid outlets 13 on both the left and right spiral discs 10 and 11 are aligned with the center of the fixed base 1. The installation is completed by fixing with the fixing rod 9. The integrated micro mixer M4 can meet the requirement of no significant pressure drop in the total flow range of 0~500mL / min (pure water as the medium). After the system is fixed and sealed, it can meet the requirement of no leakage at a pressure drop of 5MPa. The mixer inlet is 1 / 4” and the outlet is 1 / 4”.

[0054] Example 5

[0055] Embodiment 5 of the present invention describes the type and stacking quantity of the spiral grooves on the surfaces of the left spiral disk 10 and the right spiral disk 11, as well as their effects:

[0056] The radii of the left spiral disk 10 and the right spiral disk 11 are both 200 mm. The sum of the spiral angles from the inlet 12 to the outlet 13 of the spiral groove 15 on the left spiral disk 10 and the right spiral disk 11 is 900°, and the distance from the inlet 12 to the outlet 13 is 0.65 times the overall disk radius.

[0057] The left spiral disc 10 has a spiral groove 15 with a depth of 2.5 mm and a width that gradually increases from the outer periphery to the center; the liquid inlet 12 has a width of 1 mm, the inlet channel 6 has a diameter of 6 mm, the liquid outlet 13 has a width of 6 mm, the outlet channel 7 has a diameter of 6 mm, and the spiral groove 15 has a width expansion rate of 200% per 360°. The material is Monel alloy.

[0058] The spiral groove on the right spiral disc 11 has a depth of 2 mm and a width that gradually decreases from the outer periphery to the center; the diameter of the inlet channel 6 is 6 mm; the width of the liquid inlet 12 is 6 mm, the width of the liquid outlet 13 is 1 mm, the diameter of the outlet channel 7 is 6 mm, the width shrinkage rate of the spiral groove 15 per 360° is 33.3%, and the material is Monel alloy.

[0059] The default fixed base 1 and the mixer cover plate 4 have the same cylindrical cross-section. The micro mixer is integrated by combining the above-mentioned two left-hand spiral discs 10 and one right-hand spiral disc 11, with the stacking order being LRL (in the embodiment, L represents the left-hand spiral disc 10 and R represents the right-hand spiral disc 11). The liquid inlet 12 of the left-hand spiral disc 10 is aligned with the left inlet channel 6 on the fixed base 1, and the right-hand spiral disc 11 is aligned with the right inlet channel 6 on the fixed base 1. The liquid outlets 13 on the left-hand spiral disc 10 and the right-hand spiral disc 11 are aligned with the center position of the fixed base 1. The installation is completed by fixing with the fixing rod 9. The integrated micro mixer M5 can meet the requirement of no significant pressure drop in the total flow range of 0~2.5L / min (pure water as the medium). After the system is fixed and sealed, it can meet the requirement of no leakage at a pressure drop of 5MPa. The mixer inlet is 3 / 8” and the outlet is 3 / 8”.

[0060] Example 6

[0061] Embodiment 6 of the present invention describes the type and stacking quantity of the spiral grooves on the surfaces of the left spiral disk 10 and the right spiral disk 11, as well as their effects:

[0062] The radii of the left spiral disk 10 and the right spiral disk 11 are both 300 mm. The sum of the spiral angles from the inlet 12 to the outlet 13 of the spiral groove 15 on the left spiral disk 10 and the right spiral disk 11 is 1800°, and the distance from the inlet 12 to the outlet 13 is 0.9 times the overall disk radius.

[0063] The left spiral disc 10 has a spiral groove 15 with a depth of 5mm and a width that gradually increases from the outer periphery to the center; the liquid inlet 12 has a width of 1mm, the inlet channel 6 has a diameter of 8mm, the liquid outlet 13 has a width of 16mm, the outlet channel 7 has a diameter of 16mm, and the spiral groove 15 has a width expansion rate of 300% per 360°. The material is silicon carbide.

[0064] The spiral groove on the right spiral disc 11 has a depth of 4 mm and its width gradually increases from the outer periphery to the center; the diameter of the inlet channel 6 is 8 mm; the width of the liquid inlet 12 is 1 mm, the width of the liquid outlet 13 is 16 mm, the diameter of the outlet channel 7 is 16 mm, the width expansion rate of the spiral groove 15 around 360° is 300%, and the material is silicon carbide.

[0065] The default fixed base 1 and the mixer cover plate 4 have the same cylindrical cross-section. The micro mixer is integrated by combining the above-mentioned two left spiral discs 10 and two right spiral discs 11, with the stacking order being RLRL. The liquid inlet 12 of the left spiral disc 10 is aligned with the left inlet channel 6 on the fixed base 1, and the right spiral disc 11 is aligned with the right inlet channel 6 on the fixed base 1. The liquid outlets 13 on the left spiral discs 10 and right spiral discs 11 are aligned with the center position of the fixed base 1. The installation is completed by fixing with the fixing rod 9. The integrated micro mixer M6 can meet the requirement of no significant pressure drop in the total flow range of 0~10L / min (pure water as the medium). After the system is fixed and sealed, it can meet the requirement of no leakage at a pressure drop of 3MPa. The mixer inlet is 1 / 2” and the outlet is 1 / 2” or 1”.

[0066] According to the above embodiments, the spiral disk free-combination micromixer of the present invention and its method of use have the following advantages:

[0067] 1. In the overall design, the fixed base 1, the fixed rod 9 and the mixer cover plate 4 cooperate with each other, making disassembly relatively convenient and allowing for better adjustment of the number and size of the left spiral disc 10 and the right spiral disc 11;

[0068] 2. Adjusting the number of left spiral discs 10 and right spiral discs 11 allows for better control of the internal volume of the device, enabling it to be used as a device with different volumes. Furthermore, varying the width of the spiral groove 15 and counteracting the spiral direction enhances the mixing effect of the two fluids.

[0069] 3. In processes where the viscosity of materials gradually increases during the reaction process, the pressure drop of the overall mixer can be kept within a reasonable range.

[0070] Although the invention has been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these inventions without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spiral disc freely combinable micromixer, characterized in that: The device includes a fixed base (1), the mixing end of which is provided with a left spiral disc (10) and a right spiral disc (11), and the number of the left spiral disc (10) and the right spiral disc (11) is greater than or equal to 1. The left spiral disc (10) and the right spiral disc (11) are provided with spiral grooves (15), and the spiral directions of the spiral grooves (15) on the surfaces of the left spiral disc (10) and the right spiral disc (11) are opposite. The width of the spiral grooves (15) gradually decreases or gradually increases from the spiral start position to the spiral end position. The fixed end of the fixed base (1) is provided with a mixer cover plate (4) that can fix the left spiral disc (10) and the right spiral disc (11) on the fixed base (1). The mixer cover plate (4) is provided with a mixer outlet (14) that can draw out the mixture. The fixed base (1) has a mixer inlet 1 (2) and a mixer inlet 2 (3) symmetrically arranged on the liquid input end. The output ends of the mixer inlet 1 (2) and the mixer inlet 2 (3) are both provided with inlet channels (6), and the inlet channels (6) are symmetrically arranged on the mixing end of the fixed base (1). The spiral groove (15) is provided with an inlet (12) at the spiral start position and an outlet (13) at the spiral end position. The inlets (12) on the spiral groove (15) of the left spiral disc (10) and the right spiral disc (11) are respectively provided on the two corresponding inlet channels (6). The mixer outlet (14) is provided with an outlet channel (7) and the outlet (13) is correspondingly provided on the outlet channel (7). The width of the spiral groove (15) gradually decreases from the starting position to the ending position of the spiral and the width shrinkage rate of 360° per cycle is 15-85%, or the width of the spiral groove (15) increases from the starting position to the ending position of the spiral and the width expansion rate of 360° per cycle is 60-600%. The widths of the inlet (12) and outlet (13) are both greater than 0. The sum of the spiral angles from the inlet (12) to the outlet (13) of the spiral groove (15) is a multiple of 180° and not less than 540°.

2. The spiral disk free-combination micromixer according to claim 1, characterized in that: The diameter of the inlet (12) is the same as the diameter of the inlet channel (6), the diameter of the outlet (13) is the same as the diameter of the outlet channel (7), and the diameter ratio of the outlet channel (7) to the inlet channel (6) is 1:2-2:

1.

3. A spiral disk free-combination micromixer according to claim 1, characterized in that: The ratio of the depth of the spiral groove (15) to the radius of the left spiral disc (10) or the right spiral disc (11) is 1:20-1:100, and the ratio of the groove depth of the spiral groove (15) to the diameter of the inlet channel (6) is 2:1-1:

10.

4. A spiral disk free-combination micromixer according to claim 1, characterized in that: The contact surfaces of the fixed base (1) and the mixer cover plate (4) with the left spiral disc (10) or the right spiral disc (11) are made of heat-conducting material, and a medium heat exchanger is provided inside.

5. A spiral disk free-combination micromixer according to claim 1, characterized in that: The fixed base (1), the left spiral disc (10) and the right spiral disc (11) are all provided with positioning holes (5) in a circumferential array on their surfaces, and the mixer cover plate (4) is provided with a fixing rod (9) at the position corresponding to the positioning hole (5).

6. A spiral disk free-combination micromixer according to claim 1, characterized in that: The fixed base (1), mixer cover plate (4), left spiral disc (10) and right spiral disc (11) are pressed together to form a sealing structure. The mixer cover plate (4) is provided with a connecting channel (8), which is located at the mixer outlet (14).

7. A method of using a spiral disk free-combination micromixer according to any one of claims 1-6, characterized in that: Includes the following steps: Step (A), Preparation: Select the appropriate number and specifications of left-hand spiral discs (10) and right-hand spiral discs (11) according to the properties of the liquid to be mixed and the process requirements. Step (B), Assembly: Align the liquid inlet (12) on the left spiral disc (10) with one of the inlet channels (6) on the fixed base (1), and align the liquid inlet (12) on the right spiral disc (11) with the other inlet channel (6) on the fixed base (1). After stacking them according to the preset method, cover the mixer cover plate (4), adjust all the left spiral discs (10) and right spiral discs (11) so that their liquid outlets (13) correspond to the positions of the outlet channels (7) of the mixer cover plate (4), insert the fixing rod (9), and lock the fixed base (1), mixer cover plate (4), left spiral disc (10) and right spiral disc (11) together. Step (C), fluid transfer: Connect the mixer inlet 1 (2) and mixer inlet 2 (3) to the liquid to be mixed respectively, and connect the mixer outlet (14) to the external collection device. The liquid is transported to the two inlet channels (6) through the mixer inlet 1 (2) and mixer inlet 2 (3). When stacked, due to the installation direction of the left spiral disc (10) and the right spiral disc (11) and the spiral groove (15) of the surface of the left spiral disc (10) and the right spiral disc (11), there is a boundary gap in the spiral groove contact surface except for partial overlap. The liquid is transferred layer by layer through the gap. Step (D), Mixing: Under the action of the spiral groove (15) on the surface of the left spiral disk (10) and the right spiral disk (11), the two fluids flowing in cross along the spiral groove (15), thereby generating vortices to achieve mixing and enhance mass transfer; Step (E), Replacement: When it is necessary to control the volume of fluid remaining inside, simply remove the fixing rod (9), and then reinstall it by changing the number and specifications of the left spiral disc (10) and the right spiral disc (11).

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