Mixing unit and microreactor comprising same
By designing a mixing unit with reverse inclined blades in the micro reactor, the problem of low mixing efficiency of existing micro reactors is solved, and efficient two stirring mixing is achieved in a single mixing unit, which promotes the complete fusion of the liquid.
Patent Information
- Application Number
- CN202411883353.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-03-28
AI Technical Summary
The existing micro reactors have low mixing efficiency, large power consumption, and large equipment volume during the fluid mixing process. Most of them only increase the mixing degree through continuous reaction chambers, resulting in uneven mixing and insufficient reaction.
A mixing unit is designed, including a mixing cavity, a liquid inlet channel and two sets of rotating blade sets. The outlet of the liquid inlet channel is facing the blade flange surface of the first rotating blade set. The first and second rotating blade sets are arranged in sequence along the rotation axis. The blade flange surfaces have opposite inclination directions, and the mixing efficiency of the liquid is improved by reverse rotation and multiple stirring and mixing.
By increasing the contact area and centrifugal force between the liquid and the blade, two stirring and mixing in a single mixing unit are achieved, which significantly improves the mixing efficiency of the fluid and promotes the complete fusion of the two liquids.
Smart Images
Figure CN119701707A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of chemical equipment, and in particular to a mixing unit and a microreactor comprising the same. Background Art
[0002] In the chemical industry, the mixing of two fluids is a common mass transfer process. Commonly used reaction equipment include mixing kettles, static mixers, etc. They have large processing capacity and can meet the needs of large-scale production. However, these mixing equipment provide macroscopic mixing for the fluids, which has disadvantages such as low mixing efficiency, high power consumption, and large equipment size. Microreactors have completely different geometric characteristics from large reactors, with narrow and regular microchannels, very small reaction space and very large specific surface area. Therefore, microreactors have gradually replaced traditional reaction equipment and become one of the indispensable and important instruments in the chemical industry.
[0003] At present, most of the existing microreactors only use a method of setting up multiple continuous reaction chambers to improve the mixing degree of the fluid. This method has a low mixing degree for the medium fluid and is likely to cause uneven mixing and insufficient reaction. Summary of the invention
[0004] The technical problem to be solved by the present invention is to overcome the defects in the prior art and provide a mixing unit and a microreactor comprising the same.
[0005] The present invention solves the above technical problems through the following technical solutions:
[0006] The present invention provides a mixing unit, comprising a mixing chamber and a liquid inlet channel, wherein the liquid inlet channel is connected to the mixing chamber, a first rotating blade group and a second rotating blade group are arranged in the mixing chamber, the first rotating blade group and the second rotating blade group are arranged in sequence along a rotation axis direction, and the blade surface of the first rotating blade group and the blade surface of the second rotating blade group have opposite inclination directions;
[0007] The outlet of the liquid inlet channel is arranged in the mixing chamber and is located at the upstream end of the first rotating blade group. The outlet of the liquid inlet channel faces the blade surface of the first rotating blade group.
[0008] In this solution, the outlet of the liquid inlet channel is directed toward the blade surface of the first rotating blade group, which can increase the contact area between the liquid and the blade surface of the first rotating blade group when the liquid flows out from the outlet, thereby increasing the impact force of the liquid on the blades, indirectly increasing the blade speed of the first rotating blade group, and increasing the centrifugal force of the liquid flowing out from the bottom of the first rotating blade group on the first rotating blade group. In combination with the second rotating blade group, two stirring and mixing operations are performed inside the mixing chamber of a single mixing unit, thereby improving the efficiency of stirring and mixing the liquid. By setting the inclination angles of the blade surfaces of the first rotating blade group and the second rotating blade group in opposite directions, when the first rotating blade group and the second rotating blade group are impacted by the liquid, the two rotate in opposite directions, and the contact area between the liquid and the blades of the second rotating blade group is increased, thereby driving the second rotating blade group to rotate rapidly, further improving the stirring and mixing efficiency of the liquid, and promoting the mixing of the two liquids.
[0009] Preferably, the liquid inlet channel includes a plurality of branch flow channels located in the mixing chamber, and an outlet of each branch flow channel faces a blade surface of the first rotating blade assembly.
[0010] In this solution, through the above-mentioned structural design, the multiple liquids entering the liquid inlet channel are initially mixed and then flow into different branch flow channels, and then flow out to impact the blade surface of the first rotating blade group, further increasing the impact force on the blade surface of the first rotating blade group, thereby improving the mixing efficiency of the liquid.
[0011] Preferably, the mixing unit further comprises a liquid outlet channel, wherein the liquid outlet channel is arranged at a downstream end of the second rotating blade assembly and is communicated with the mixing chamber.
[0012] In this solution, the liquid outlet channel is arranged at the downstream end of the second rotating blade group, which is conducive to the liquid flowing out after being fully mixed.
[0013] Preferably, a mounting frame is provided in the mixing chamber, a first rotating shaft and a second rotating shaft are respectively provided on opposite sides of the mounting frame, the first rotating blade group is installed on the first rotating shaft, and the second rotating blade group is installed on the second rotating shaft.
[0014] In the present solution, by providing a mounting frame, a first rotating shaft and a second rotating shaft, the installation of the first rotating blade group and the second rotating blade group is facilitated. By installing the first rotating blade group and the second rotating blade group on different rotating shafts respectively, it is avoided that the two are arranged on the same rotating shaft, which causes the rotation speed to be affected due to different rotation directions during rotation, thereby affecting the mixing efficiency.
[0015] Preferably, the first rotating blade set is connected to the first rotating shaft for relative rotation; and / or the second rotating blade set is connected to the second rotating shaft for relative rotation.
[0016] Preferably, one end of the first rotating shaft is rotatably connected to the mounting frame via a first bearing, and the first rotating blade group is fixedly mounted on the other end of the first rotating shaft; and / or, one end of the second rotating shaft is rotatably connected to the mounting frame via a second bearing, and the second rotating blade group is fixedly mounted on the other end of the second rotating shaft.
[0017] In this solution, the above structure is adopted to further increase the rotation speed of the first rotating blade group and the second rotating blade group, thereby improving the mixing efficiency.
[0018] Preferably, the first rotating blade group is relatively fixed to the first rotating shaft via a first rotating gyroscope; and / or the second rotating blade group is relatively fixed to the second rotating shaft via a second rotating gyroscope.
[0019] In this solution, the rotating blade group is installed by rotating the gyroscope, so that the rotation speed of the rotating blades can be further increased.
[0020] Preferably, the mounting frame comprises a connecting portion and a central mounting portion, the central mounting portion is used to mount the first rotating shaft and the second rotating shaft, and the connecting portion is used to fix the central mounting portion in the middle of the mixing chamber;
[0021] The connecting portion includes a plurality of connecting rods, one end of each of the connecting rods is connected to the central mounting portion, and the other end of each of the connecting rods is connected to the inner wall of the mixing chamber.
[0022] In this solution, the mounting frame adopts the above structure, so that the liquid left from the first rotating blade group can enter the area of the first rotating blade group through the space between the connecting rods for mixing.
[0023] Preferably, a mounting shaft is provided in the mixing chamber, and the first rotating blade group and the second rotating blade group are mounted on the mounting shaft;
[0024] The first rotating blade group and the second rotating blade group are configured to rotate independently relative to the installation shaft; or, the first rotating blade group and the second rotating blade group are fixed relative to the installation shaft, and the installation shaft is rotatably arranged in the mixing chamber.
[0025] Preferably, the plane where the blade surface of the first rotating blade group is located forms a first angle with the rotation center axis of the first rotating blade group, and the first angle is 15°-60°;
[0026] And / or, a plane where the blade surfaces of the second rotating blade assembly are located forms a second angle with the rotation center axis of the second rotating blade assembly, and the second angle is 15°-60°.
[0027] In this solution, the inclination angle of the blade surface of the rotating blade group is selected within the above range, and the impact of the liquid on the blade surface is better.
[0028] The present invention also provides a microreactor, wherein the microreactor comprises the mixing unit as described above.
[0029] Preferably, there are a plurality of mixing units, and the plurality of mixing units are connected in sequence, and the inlet of the liquid inlet channel of the mixing cavity of the latter mixing unit is connected to the liquid outlet channel of the mixing cavity of the former mixing unit;
[0030] The microreactor further comprises a first liquid input pipe and a second liquid input pipe, wherein the first liquid input pipe and the second liquid input pipe are connected to the inlet of the liquid inlet channel of the first mixing unit through a three-way joint.
[0031] In this solution, the microreactor can effectively improve the efficiency of liquid stirring and mixing by cooperating with multiple mixing units, thereby achieving the purpose of complete fusion of two liquids.
[0032] The positive and progressive effect of the present invention is that the mixing unit of the present invention can increase the contact area between the liquid and the blade surface of the first rotating blade group when the liquid flows out from the outlet, thereby increasing the impact force of the liquid on the blade, indirectly increasing the blade speed of the first rotating blade group, increasing the centrifugal force of the liquid flowing out from the bottom of the first rotating blade group on the first rotating blade group, and then cooperating with the second rotating blade group to achieve two stirring and mixing inside the mixing chamber of a single mixing unit, thereby improving the efficiency of stirring and mixing the liquid. By setting the inclination angles of the blade surfaces of the first rotating blade group and the second rotating blade group in opposite directions, when the first rotating blade group and the second rotating blade group are impacted by the liquid, the two rotate in opposite directions, and the contact area between the liquid and the blades of the second rotating blade group is increased, thereby driving the second rotating blade group to rotate rapidly, further improving the stirring and mixing efficiency of the liquid, and promoting the mixing of the two liquids. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 This is a schematic diagram of the internal structure of the mixing unit in Example 1 of the present invention from a first perspective.
[0034] Figure 2 It is a schematic diagram of the structure of the interior of the mixing unit in Example 1 of the present invention from a second viewing angle.
[0035] Figure 3 This is a schematic diagram of the installation of the first rotating blade group and the second rotating blade group in Example 1 of the present invention.
[0036] Figure 4Schematic diagram of the structure of the microreactor in an embodiment of the present invention.
[0037] Description of reference numerals:
[0038] Mixing unit 100, housing 110, lower housing 111, upper housing 112, mixing chamber 113, liquid inlet pipe 120, liquid inlet main pipe 121, funnel pipe 122, diverter pipe 123, liquid outlet pipe 130, first rotating blade set 140, first blade 141, first rotating gyroscope 142, second rotating blade set 150, second blade 151, second rotating gyroscope 152, first rotating shaft 160, second rotating shaft 170, central mounting portion 180, connecting portion 190;
[0039] Fluid pipeline 200 , first liquid input pipe 300 , second liquid input pipe 400 , three-way connector 500 , liquid output pipe 600 , box 700 . DETAILED DESCRIPTION
[0040] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.
[0041] Example 1
[0042] like Figure 1-3 As shown, this embodiment discloses a mixing unit 100, including a mixing chamber 113 and a liquid inlet channel, the liquid inlet channel is connected to the mixing chamber 113, a first rotating blade group 140 and a second rotating blade group 150 are arranged in the mixing chamber 113, the first rotating blade group 140 and the second rotating blade group 150 are arranged in sequence along the direction of the rotation axis, and the blade surface of the first rotating blade group 140 and the blade surface of the second rotating blade group 150 have opposite inclination directions; the outlet of the liquid inlet channel is arranged in the mixing chamber 113 and located at the upstream end of the first rotating blade group 140, and the outlet of the liquid inlet channel faces the blade surface of the first rotating blade group 140. Figure 3 As shown, the inclination of the blade means that the side edge of the blade connected to the rotating shaft has an angle less than 90° with the rotating axis.
[0043] The mixing unit 100 directs the outlet of the liquid inlet channel toward the blade surface of the first rotating blade group 140, which can increase the contact area between the liquid and the blade surface of the first rotating blade group 140 when the liquid flows out from the outlet, thereby increasing the impact force of the liquid on the blade, indirectly increasing the blade speed of the first rotating blade group 140, increasing the centrifugal force of the liquid flowing out from the bottom of the first rotating blade group 140 on the first rotating blade group 140, and then cooperating with the second rotating blade group 150, achieving two stirring and mixing inside the mixing chamber 113 of the single mixing unit 100, thereby improving the efficiency of stirring and mixing the liquid. By setting the inclination angles of the blade surfaces of the first rotating blade group 140 and the second rotating blade group 150 in opposite directions, when the first rotating blade group 140 and the second rotating blade group 150 are impacted by the liquid, the two rotate in opposite directions, and increase the contact area between the liquid and the blades of the second rotating blade group 150, thereby driving the second rotating blade group 150 to rotate rapidly, further improving the stirring and mixing efficiency of the liquid, and thus promoting the mixing of the two liquids.
[0044] The liquid inlet channel includes a plurality of branch channels located in the mixing chamber 113, and the outlet of each branch channel faces the blade surface of the first rotating blade set 140. Through the above structural design, the multiple liquids entering the liquid inlet channel are initially mixed and then flow into different branch channels, and then flow out to impact the blade surface of the first rotating blade set 140, further improving the impact force on the blade surface of the first rotating blade set 140, thereby improving the mixing efficiency of the liquid.
[0045] Specifically, see Figure 1-2 The mixing unit 100 has a housing 110 consisting of a lower housing 111 and an upper housing 112. The lower housing 111 and the upper housing 112 are arranged as a split structure. The inner cavity after the lower housing 111 and the upper housing 112 are combined forms a mixing cavity 113. The upper housing 112 is connected with a liquid inlet pipe 120. The liquid inlet pipe 120 provides a liquid inlet channel for the liquid to be mixed to enter the mixing cavity 113. The liquid inlet pipe 120 includes a liquid inlet main pipe 121, a funnel pipe 122, and a diverter pipe 123. The liquid inlet main pipe 121 is arranged outside the cavity of the upper housing 112, and the funnel pipe 122 and the diverter pipe 123 are arranged inside the cavity of the upper housing 112. The two ends of the funnel pipe 122 are connected to the liquid inlet main pipe 121 and the diverter pipe 123 respectively. The shunt pipe 123 provides a branch flow channel for the liquid entering the mixing chamber 113 . There are two shunt pipes 123 . The two shunt pipes 123 are respectively bent from the lower end of the funnel tube 122 into a U-shaped structure, so that the outlet of the branch flow channel can be directed toward the blade surface of the first rotating blade group 140 .
[0046] The lower housing 111 is connected with a liquid outlet pipe 130, which provides a liquid outlet channel for the mixed liquid to flow out of the mixing chamber 113. The liquid outlet channel is arranged at the downstream end of the second rotating blade assembly 150 and communicates with the mixing chamber 113. The liquid outlet channel is arranged at the downstream end of the second rotating blade assembly 150, which is conducive to the liquid flowing out after being fully mixed.
[0047] In this embodiment, a mounting frame is provided in the mixing chamber 113, and a first rotating shaft 160 and a second rotating shaft 170 are provided on opposite sides of the mounting frame, respectively. The first rotating blade set 140 is installed on the first rotating shaft 160, and the second rotating blade set 150 is installed on the second rotating shaft 170. By providing the mounting frame, the first rotating shaft 160 and the second rotating shaft 170, the installation of the first rotating blade set 140 and the second rotating blade set 150 is facilitated, and by installing the first rotating blade set 140 and the second rotating blade set 150 on different rotating shafts, respectively, it is avoided that the two are arranged on the same rotating shaft, resulting in the rotation speed being affected due to different rotation directions during rotation, thereby affecting the mixing efficiency.
[0048] Specifically, the mounting frame includes a connecting portion 190 and a central mounting portion 180, wherein the central mounting portion 180 is used to mount the first rotating shaft 160 and the second rotating shaft 170, and the connecting portion 190 is used to fix the central mounting portion 180 in the middle of the mixing chamber 113; the connecting portion 190 includes a plurality of connecting rods, one end of each of the plurality of connecting rods is connected to the central mounting portion 180, and the other end is connected to the inner wall of the mixing chamber 113. In this embodiment, there are four connecting rods, which are circumferentially distributed on the outer peripheral side of the central mounting portion 180 to form a cross structure. The mounting frame adopts the above structure, so that the liquid left from the first rotating blade group 140 can enter the area of the first rotating blade group 140 through the space between the connecting rods for mixing.
[0049] In this embodiment, one end of the first rotating shaft 160 is rotatably connected to the mounting frame via a first bearing, and the first rotating blade set 140 is fixedly mounted on the other end of the first rotating shaft 160; one end of the second rotating shaft 170 is rotatably connected to the mounting frame via a second bearing, and the second rotating blade set 150 is fixedly mounted on the other end of the second rotating shaft 170. With the above structure, the rotation speed of the first rotating blade set 140 and the second rotating blade set 150 can be further increased, thereby improving the mixing efficiency.
[0050] Furthermore, the first rotating blade group 140 is relatively fixedly installed with the first rotating shaft 160 through the first rotating gyroscope 142; the second rotating blade group 150 is relatively fixedly installed with the second rotating shaft 170 through the second rotating gyroscope 152. The rotating blade group can be installed by rotating the gyroscope to further increase the rotation speed of the rotating blade. The relatively fixed installation of the rotating blade group and the rotating shaft means that the rotating blade group and the rotating shaft will not rotate relative to each other.
[0051] Specifically, in this embodiment, the first rotating blade group 140 includes a plurality of first blades 141, which are circumferentially fixed on the first rotating gyroscope 142 to form the first rotating blade group 140. The second rotating blade group 150 includes a plurality of second blades 151, which are circumferentially fixed on the second rotating gyroscope 152 to form the second rotating blade group 150.
[0052] The plane where the blade surface of the first rotating blade group 140 is located forms a first angle with the rotation center axis of the first rotating blade group 140, and the first angle is 15°-60°; the plane where the blade surface of the second rotating blade group 150 is located forms a second angle with the rotation center axis of the second rotating blade group 150, and the second angle is 15°-60°. That is, the plane where the blade surface of the first blade 141 is located forms a first angle with the rotation center axis of the first rotating blade group 140, and the first angle is 15°-60°; the plane where the blade surface of the second blade 151 is located forms a second angle with the rotation center axis of the second rotating blade group 150, and the second angle is 15°-60°. The inclination angle of the blade surface of the rotating blade group is selected in the above range, and the impact of the liquid on the blade surface is better. In this embodiment, the first angle and the second angle can be designed according to the axis of the outlet of the liquid inlet channel, so that the axis of the outlet of the liquid inlet channel is perpendicular to the blade surface.
[0053] In some other embodiments, the first rotating blade set 140 is connected to the first rotating shaft 160 for relative rotation, and the second rotating blade set 150 is connected to the second rotating shaft 170 for relative rotation. That is, the first rotating shaft 160 and the second rotating shaft 170 are relatively fixed to the central mounting seat, and the rotating blade set can rotate relative to the rotating shaft.
[0054] like Figure 4 As shown, an embodiment of the present invention further provides a microreactor, which includes the above-mentioned mixing unit 100. There are multiple mixing units 100, and the multiple mixing units 100 are connected in sequence. The inlet of the liquid inlet channel of the mixing cavity 113 of the latter mixing unit 100 is connected to the liquid outlet channel of the mixing cavity 113 of the previous mixing unit 100 through the fluid pipeline 200.
[0055] The microreactor further comprises a housing 700, a first liquid input pipe 300, a second liquid input pipe 400, and a liquid output pipe 600. A mixing unit 100 is installed in the housing 700, and the first liquid input pipe 300, the second liquid input pipe 400, and the liquid output pipe 600 are fixed on the housing 700. The first liquid input pipe 300 and the second liquid input pipe 400 are connected to the inlet of the liquid inlet channel of the first mixing unit 100 through a three-way joint 500, and the liquid outlet pipe 130 of the last mixing unit 100 is connected to the liquid output pipe 600. The microreactor can effectively improve the efficiency of stirring and mixing the liquids by cooperating with a plurality of mixing units 100, thereby achieving the purpose of completely fusing the two liquids.
[0056] When the microreactor is in use, two mixed liquids are injected from the first liquid input pipe 300 and the second liquid input pipe 400 respectively, and the two liquids are preliminarily mixed inside them by using the three-way joint 500, and then flow into the interior of the liquid inlet main pipe 121, and are introduced into the interior of the mixing chamber 113 through the funnel tube 122 and the diverter pipe 123 at the bottom. The inflow of liquid is used to impact the blades of the first rotating blade group 140 and the second rotating blade group 150 in sequence, and the first rotating blade group 140 and the second rotating blade group 150 are used to rotate in opposite directions to stir and mix the mixed liquid. After being mixed multiple times by multiple mixing units 100, the mixed liquid is finally discharged through the liquid output pipe 600.
[0057] Example 2
[0058] The structure of the mixing unit 100 of this embodiment is substantially the same as that of Embodiment 1, except that: in this embodiment, a mounting shaft is provided in the mixing chamber 113, and the first rotating blade group 140 and the second rotating blade group 150 are mounted on the mounting shaft; the first rotating blade group 140 and the second rotating blade group 150 are configured to rotate independently relative to the mounting shaft.
[0059] Alternatively, in some embodiments, the first rotating blade set 140 and the second rotating blade set 150 are fixed relative to the mounting shaft, and the mounting shaft is rotatably disposed in the mixing chamber 113 .
[0060] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.
Claims
1. A mixing unit, comprising a mixing chamber and a liquid inlet channel, wherein the liquid inlet channel is connected to the mixing chamber, characterized in that: A first rotating blade group and a second rotating blade group are arranged in the mixing chamber, the first rotating blade group and the second rotating blade group are arranged in sequence along the direction of the rotation axis, and the blade surface of the first rotating blade group and the blade surface of the second rotating blade group have opposite inclination directions; The outlet of the liquid inlet channel is arranged in the mixing chamber and is located at the upstream end of the first rotating blade group. The outlet of the liquid inlet channel faces the blade surface of the first rotating blade group.
2. The mixing unit according to claim 1, characterized in that The liquid inlet channel comprises a plurality of branch flow channels located in the mixing chamber, and the outlet of each branch flow channel faces the blade surface of the first rotating blade group; And / or, the mixing unit further comprises a liquid outlet channel, the liquid outlet channel is arranged at the downstream end of the second rotating blade assembly and communicates with the mixing chamber; And / or, a mounting frame is provided in the mixing chamber, a first rotating shaft and a second rotating shaft are respectively provided on opposite sides of the mounting frame, the first rotating blade group is installed on the first rotating shaft, and the second rotating blade group is installed on the second rotating shaft.
3. The mixing unit according to claim 2, characterized in that The first rotating blade assembly is connected to the first rotating shaft for relative rotation; And / or, the second rotating blade set is connected to the second rotating shaft for relative rotation.
4. The mixing unit according to claim 2, characterized in that One end of the first rotating shaft is rotatably connected to the mounting frame via a first bearing, and the first rotating blade assembly is fixedly mounted on the other end of the first rotating shaft; And / or, one end of the second rotating shaft is rotatably connected to the mounting frame via a second bearing, and the second rotating blade assembly is fixedly mounted on the other end of the second rotating shaft.
5. The mixing unit according to claim 4, characterized in that The first rotating blade group is fixed relative to the first rotating shaft via a first rotating gyroscope; And / or, the second rotating blade set is fixed relative to the second rotating shaft via a second rotating gyroscope.
6. The mixing unit according to claim 2, characterized in that The mounting frame includes a connecting portion and a central mounting portion, wherein the central mounting portion is used to mount the first rotating shaft and the second rotating shaft, and the connecting portion is used to fix the central mounting portion in the middle of the mixing chamber; The connecting portion includes a plurality of connecting rods, one end of each of the connecting rods is connected to the central mounting portion, and the other end of each of the connecting rods is connected to the inner wall of the mixing chamber.
7. The mixing unit according to claim 1, characterized in that A mounting shaft is provided in the mixing chamber, and the first rotating blade group and the second rotating blade group are mounted on the mounting shaft; The first rotating blade group and the second rotating blade group are configured to rotate independently relative to the installation shaft; or, the first rotating blade group and the second rotating blade group are fixed relative to the installation shaft, and the installation shaft is rotatably arranged in the mixing chamber.
8. The mixing unit according to any one of claims 1 to 7, characterized in that The plane where the blade surfaces of the first rotating blade group are located forms a first angle with the rotation center axis of the first rotating blade group, and the first angle is 15°-60°; And / or, a plane where the blade surfaces of the second rotating blade assembly are located forms a second angle with the rotation center axis of the second rotating blade assembly, and the second angle is 15°-60°.
9. A microreactor, characterized in that: The microreactor comprises a mixing unit as claimed in any one of claims 1 to 8.
10. The microreactor according to claim 9, characterized in that There are multiple mixing units, and the multiple mixing units are connected in sequence, and the inlet of the liquid inlet channel of the mixing cavity of the latter mixing unit is connected to the liquid outlet channel of the mixing cavity of the former mixing unit; The microreactor further comprises a first liquid input pipe and a second liquid input pipe, wherein the first liquid input pipe and the second liquid input pipe are connected to the inlet of the liquid inlet channel of the first mixing unit through a three-way joint.