Stirring device
By introducing a gas distributor and a dispersion paddle into the mixing device, the problems of insufficient mixing and high energy consumption of existing mixing devices are solved, achieving efficient solid-liquid-gas three-phase mixing, improving leaching efficiency and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QUZHOU HUAYOU COBALT NEW MATERIAL CO LTD
- Filing Date
- 2025-06-23
- Publication Date
- 2026-07-31
AI Technical Summary
Existing stirring devices suffer from flow dead zones and insufficient mixing when processing high-density blocky alloy solids, resulting in low leaching efficiency and high power consumption, which increases production costs.
A stirring device including a stirring shaft, a dispersing paddle, and a gas distributor was designed. By setting an air inlet channel and a gas distributor inside the stirring shaft, gas is introduced from the bottom of the reaction vessel. Combined with the specific structural design of the dispersing paddle, the solid, liquid, and gas phases are fully mixed, preventing the deposition of solid substances.
It improves the mixing efficiency of the solid, liquid, and gas phases, prevents solid material deposition, reduces energy consumption, and enhances leaching efficiency and production capacity.
Smart Images
Figure CN224573623U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chemical reaction device technology, specifically to a stirring device. Background Technology
[0002] To extract valuable metals such as copper and cobalt from expensive mineral raw materials, hydrometallurgical technology is currently the main method used. However, in actual smelting processes, valuable metal solids such as cobalt alloys often clump together, and their high density easily leads to sediment buildup at the bottom of the reaction vessel. This causes a large amount of gas introduced into the vessel to rapidly overflow, ultimately resulting in low leaching efficiency of the solids.
[0003] However, existing stirring devices generate upward or downward flows, creating two dispersed flow fields. When processing high-density, blocky alloy solids, their effect on solid-liquid suspension is limited, and dead zones easily form in the central area of the stirring device, preventing the solid raw materials, liquid reactants, and aeration gases within the reaction vessel from fully mixing to achieve the chemical reaction and leaching of the desired metal. Furthermore, existing stirring devices consume relatively high power due to their high rotational speed and strong shear force, thus increasing production costs. Utility Model Content
[0004] In view of this, the present invention provides a stirring device, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.
[0005] To achieve the aforementioned objective, this utility model provides a stirring device, which includes a stirring shaft, a dispersing paddle disposed near the end of the stirring shaft, and a gas distributor disposed at the end of the stirring shaft. The stirring shaft has an air inlet channel inside, and the air inlet channel is connected to the gas distributor.
[0006] The dispersing impeller includes a bushing fitted onto the stirring shaft, impeller blades disposed on the outer periphery of the bushing, and a dispersing disk disposed on the bushing, wherein the diameter of the dispersing disk is smaller than the outer diameter of the impeller blades.
[0007] In the stirring device described above, optionally, the diameter of the dispersing disc is 1 / 4 to 1 / 6 of the outer diameter of the impeller.
[0008] In the stirring device described above, optionally, the outer periphery of the dispersing disc is provided with a second serration, which is used to shear bubbles and cut solid substances.
[0009] In the stirring device described above, optionally, the blade is a variable cross-section blade shape, the blade having a root connected to the bushing and an end away from the bushing.
[0010] In the stirring device described above, optionally, the radial angle between the root of the blade and the bushing is 40° to 45°, and the radial angle between the end of the blade and the bushing is 10° to 15°.
[0011] In the stirring device described above, optionally, the end of the blade is provided with a bubble hole.
[0012] In the stirring device described above, optionally, the bubble hole has an inlet and an outlet, the diameter of the inlet is larger than the diameter of the outlet, and the diameter of the bubble hole gradually decreases from the inlet to the outlet.
[0013] In the stirring device described above, optionally, the blade is provided with a first serration on the side near the gas distributor, the first serration being used to shear bubbles and cut solid substances.
[0014] In the stirring device described above, optionally, the gas distributor includes a diffuser connected to the end of the stirring shaft and a dispersion section connected to the diffuser. The diffuser and the dispersion section are provided with a central air hole, and the dispersion section is radially provided with a plurality of dispersion air holes.
[0015] In the stirring device described above, optionally, the dispersing part is a mesh plate, and the dispersing pores account for 40% to 80% of the total area of the mesh plate.
[0016] The stirring device of this invention includes a stirring shaft, a dispersing paddle located near the end of the stirring shaft, and a gas distributor located at the end of the stirring shaft. An air inlet channel is provided inside the stirring shaft, connecting to the gas distributor. External gas passes through the air inlet channel and is discharged from the gas distributor to the bottom of the reaction vessel, thereby disturbing the solid material located in the central region at the bottom of the reaction vessel and preventing the solid material from accumulating as sludge at the bottom of the reaction vessel.
[0017] The dispersion impeller of this invention's stirring device includes a bushing fitted onto a stirring shaft, impeller blades disposed around the outer periphery of the bushing, and a dispersion disk disposed on the bushing. The diameter of the dispersion disk is smaller than the outer diameter of the impeller blades. The dispersion disk is used to block unreacted gas from overflowing along the stirring shaft, guiding the gas to the impeller blades for shearing, thereby ensuring thorough mixing of the solid substance, liquid reactant, and gas phases within the reaction vessel, generating a chemical reaction, improving leaching efficiency, and effectively increasing production capacity. Attached Figure Description
[0018] The disclosure of this utility model will become more apparent from the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.
[0019] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the stirring device of this utility model.
[0020] Figure 2 for Figure 1 A partial schematic diagram of an embodiment of the stirring device, showing the dispersing paddle and the gas distributor.
[0021] Figure 3 for Figure 1 A schematic diagram of the gas distributor in an embodiment of the stirring device.
[0022] Figure 4 for Figure 3 A cross-sectional schematic diagram of the gas distributor in the embodiment.
[0023] Figure 5 for Figure 1 A partial schematic diagram of an embodiment of the stirring device, showing the blades of the dispersing paddle.
[0024] Figure 6 for Figure 5 A bubble flow diagram during the operation of the dispersion paddle in an embodiment of the stirring device.
[0025] Figure 7 for Figure 6 A partial cross-sectional schematic diagram of the impeller in an embodiment of the stirring device, showing bubble holes.
[0026] Figure 8 for Figure 1 A partial schematic diagram of the dispersing paddle in an embodiment of the stirring device, showing the dispersing disc.
[0027] In the figure: 1-Drive unit; 2-Stirring shaft; 21-First end; 22-Second end; 23-Inlet channel; 3-Inlet unit; 31-Gas distributor; 32-Central vent; 33-Dispersion vent; 34-Diffuser; 35-Dispersion unit; 4-Stirring paddle; 5-Dispersion paddle; 51-Paddle blade; 52-Dispersion disc; 53-Sleeve; 54-First serration; 55-Bubble hole; 56-Second serration; 57-Root; 58-End; 6-Bubble; 61-Inlet; 62-Outlet. Detailed Implementation
[0028] Referring to the accompanying drawings and specific embodiments, the structure, composition, features, and advantages of the stirring device of this utility model will be described below by way of example; however, all descriptions should not be construed as limiting the present utility model in any way.
[0029] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the various drawings, the present invention still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle. Therefore, these further embodiments according to the present invention should also be considered within the scope of the description herein.
[0030] It should also be noted that the terms "inner", "outer", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship of the stirring device and its components shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.
[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.
[0032] In the description of this disclosure, "multiple" means at least two, such as two, three or more, unless otherwise expressly and specifically limited.
[0033] from Figure 1 As can be seen, the stirring device of this utility model includes a drive unit 1, a stirring shaft 2 connected to the drive unit 1, a stirring paddle 4 disposed in the middle of the stirring shaft 2, and a dispersing paddle 5. The stirring shaft 2 has a first end 21 and a second end 22 opposite to the first end 21. The drive unit 1 is connected to the first end 21 of the stirring shaft 2, and the dispersing paddle 5 is disposed at the second end 22 of the stirring shaft 2. The stirring shaft 2 can be driven to rotate by the drive unit 1, thereby driving the stirring paddle 4 and the dispersing paddle 5 to rotate.
[0034] like Figure 1 As shown, the stirring device also includes an air inlet 3, and an air inlet channel 23 is provided inside the stirring shaft 2, which connects to the air inlet 3. The air inlet channel 23 extends from the connection between the stirring shaft 2 and the air inlet 3 to the second end 22, and is used to circulate external gas introduced from the air inlet 3. A gas distributor 31 is connected to the port of the air inlet channel 23 at the second end 22. When the stirring device is running, the air inlet 3 introduces external gas through the air inlet channel 23 inside the stirring shaft 2, and then discharges it through the gas distributor 31.
[0035] In use, solid raw materials, such as mineral raw materials, are placed in the reaction vessel, and then liquid reactants, such as concentrated sulfuric acid, are added. A stirring device is placed in the reaction vessel, with the stirring shaft 2, stirring paddle 4, and dispersing paddle 5 located inside the reaction vessel. The gas distributor 31 at the second end 22 of the stirring shaft 2 and the dispersing paddle 5 are located at the bottom of the reaction vessel to agitate the solid raw materials located at the bottom of the reaction vessel.
[0036] During smelting, the drive unit 1 drives the stirring shaft 2 to rotate, which in turn drives the stirring paddle 4 and the dispersing paddle 5 to rotate. At this time, external gas enters the air intake channel 23 through the air intake unit 3 and is discharged from the gas distributor 31 at the second end 22, that is, gas is injected from the bottom of the reaction vessel. Through the rotation of the dispersing paddle 5, the gas, liquid and solid in the reaction vessel are fully mixed, producing an aeration effect and accelerating the chemical reaction. The rotating stirring paddle 4 and the dispersing paddle 5 form an axial flow field in the reaction vessel, preventing suspended solids from sinking and allowing them to fully undergo chemical reactions to leach the desired solid substances.
[0037] Specifically, from Figure 2 It can be clearly seen that the gas distributor 31 is located at the second end 22 of the stirring shaft 2. Combined with... Figure 3 It can be seen that the gas distributor 31 includes a diffuser 34 and a dispersion section 35 connected to the diffuser 34.
[0038] from Figure 3 As can be seen, the connection between the diffuser 34 and the second end 22 of the stirring shaft 2 is narrower, while the connection with the dispersion section 35 is wider, forming a truncated cone shape to increase the outlet diameter of the gas. The end of the dispersion section 35 that connects to the diffuser 34 is wider, while the other end is narrower, also forming a truncated cone shape. The diameter of the narrower end can increase the gas discharge speed.
[0039] Furthermore, combined Figure 4 As can be seen, the diffuser 34 and the dispersion section 35 of the gas distributor 31 are provided with a central air hole 32, and the dispersion section 35 is radially arranged with multiple dispersion air holes 33. It can be understood that the smaller the volume of the gas bubbles, the more fully they can mix with the liquid to produce a better aeration effect.
[0040] The gas discharged from the central vent 32, such as Figure 5 As shown by the downward arrow, the liquid at the bottom center of the dispersion paddle 5 can be disturbed, causing solid matter to flow with the liquid and preventing solid matter from depositing here.
[0041] The dispersion pores 33 can perform preliminary shearing on the radially discharged gas, and the flared design of the dispersion section 35 guides the discharged gas. Figure 5As indicated by the upward-curving arrows on both sides, the bubble 6 is guided by the dispersion section 35 to the vicinity of the dispersion paddle 5, where it is further sheared into smaller bubbles 6 by the dispersion paddle 5.
[0042] The dispersion section 35 can be a mesh plate, and the proportion of the dispersion holes 33 to the total area of the mesh plate is not limited, as long as it can guide the gas radially to the dispersion paddle 5. The area of the dispersion holes 33 of the mesh plate can account for 40% to 80% of the total area of the mesh plate. While ensuring the gas is dispersed and discharged, the discharge volume and discharge speed are controlled to prevent the gas from being discharged too fast or too slow, which would affect the gas's participation in the reaction. In one embodiment, the area of the dispersion holes 33 of the mesh plate accounts for 50% of the total area of the mesh plate to uniformly guide the gas to the vicinity of the dispersion paddle 5 and control the gas discharge at a moderate speed.
[0043] The central vent 32 and the dispersion vent 33 of the gas distributor 31, combined with the disturbance of the liquid in the reaction vessel by the dispersion paddle 5, agitate the solid material at the bottom center of the reaction vessel, causing it to flow with the liquid and participate in the reaction.
[0044] from Figure 2 It can also be seen that the dispersing impeller 5 includes a bushing 53 fitted around the outer periphery of the stirring shaft 2 and multiple blades 51 evenly distributed around the outer periphery of the bushing 53. Optionally, the number of blades 51 can be as follows: Figure 2 In one embodiment, the bushing 53 has four blades 51 evenly distributed in the radial direction.
[0045] exist Figure 2 In this embodiment, the blade 51 has a variable cross-section blade shape, that is, the blade 51 disposed on the bushing 53 has a twisted shape. The blade 51 has a root 57 connected to the bushing 53 and an end 58 of the blade 51 away from the bushing 53, that is, the blade 51 twists and transitions from the root 57 to the end 58.
[0046] Figure 2 The included angle α between the root 57 of the impeller 51 and the radial direction of the bushing 53 is marked, and the angle α can be between 40° and 45°. It can be understood that the 40° to 45° angle range represents the midpoint between the radial and axial directions of the bushing 53, indicating that the impeller 51 is positioned neither too axially nor too radially. This ensures that when the dispersing paddle 5 rotates, the impeller 51 has both axial thrust, preventing it from being excessively axially biased and thus reducing the axial thrust of the feed liquid, thereby ensuring the axial circulation flow field of the feed liquid, improving the suspension effect of solid matter in the reaction vessel, and preventing solid matter from accumulating at the bottom of the reaction vessel; the impeller 51 also has a radial angle, preventing it from being excessively radially biased and thus insufficient axial thrust.
[0047] Figure 2The diagram also indicates the radial angle b between the end 58 of the blade 51 and the bushing 53, which can be between 10° and 15°. It can be understood that the closer the angle of the end 58 of the blade 51 is to the radial direction, the closer the blade surface of the blade 51 is to the radial direction, resulting in less resistance during rotation and thus lower power consumption. An angle b of 10° to 15°, a relatively gentle angle close to the radial direction, maintains both the radial and axial forces of the blade 51 while reducing the power required for the rotation of the dispersed propeller 5.
[0048] The blade 51 twists gently from angle a at its root 57 to angle b at its end 58. It can be seen that the blade twist angle of the dispersing blade 5 in this invention's stirring device is relatively gentle. The selection of angles a and b aims to reduce rotational power while ensuring the axial thrust and radial stirring force of the dispersing blade 5.
[0049] The angle design of the blade 51 allows the dispersing propeller 5 to simultaneously perform radial dispersion and axial flow functions. The circular arc torsion design of the variable cross-section blade shape of the blade 51 can reduce the power consumption of the blade 51 rotation.
[0050] from Figure 2 It can also be seen that the blade 51 is equipped with bubble holes 55. Combined with... Figure 5 It can be seen that bubble pore 55 is used to break large bubbles into smaller bubbles. In Figure 6 In one embodiment, the bubble hole 55 is located on the blade surface of the blade 51 near the end 58.
[0051] Specifically, the bushing 53 can be as follows: Figure 6 The rotating arrow indicates rotation, which drives the dispersing paddle 5 to rotate. Bubbles 6 discharged from the gas distributor 31, as shown in the image... Figure 6 As indicated by the leftward-curving arrow, the air is introduced into the end 58 of the blade 51 of the dispersing paddle 5, and discharged from the other end of the bubble hole 55 located at the end 58, breaking it into small bubbles 6.
[0052] Furthermore, such as Figure 7 As shown, the bubble hole 55 has an inlet 61 and an outlet 62. The diameter of the inlet 61 is larger than the diameter of the outlet 62. That is, the diameter of the bubble hole 55 gradually decreases from the inlet 61 to the outlet 62, and the hole wall of the bubble hole 55 forms a truncated cone shape.
[0053] During the high-speed rotation of the blade 51, liquid containing bubbles 6 enters through the inlet 61 of the bubble orifice 55 and exits through the outlet 62. Due to Bernoulli's principle, the increased flow velocity leads to a decrease in static pressure, creating a low-pressure or even vacuum zone at the outlet 62 of the smaller bubble orifice 55. This zone attracts surrounding bubbles 6, which then pass through the bubble orifice 55 and expand. According to Laplace's law, the increased radius of curvature of the bubble expansion leads to a decrease in the pressure difference between the inside and outside of the bubble, reducing the mechanical strength of the bubble wall and making it more susceptible to external disturbances and breakage. Therefore, the high-speed flowing liquid at the outlet 62 exerts a shear force on the bubbles, easily causing them to break apart, breaking large bubbles into smaller, denser microbubbles.
[0054] In an optional embodiment, the inlet 61 and outlet 62 of the bubble hole 55 may also have the same aperture. Through the circumferential force of the rotation of the dispersing paddle 5, the bubble holes 55 with the same aperture can also shear the bubble.
[0055] To further break down large bubbles into smaller ones, such as... Figure 2 As shown, the blade 51 may also be provided with a first serration 54 on the side near the gas distributor 31. Combined with... Figure 5 As shown, when the bubbles 6 discharged from the gas distributor 31 flow to the blade 51, the bubbles 6 passing through the first serration 54 of the blade 51 are sheared by the first serration 54, forming small bubbles, which are then further sheared into smaller and denser microbubbles 6 by the bubble holes 55. It can be understood that while shearing the bubbles 6, the first serration 54 can also cut the solid material passing with the liquid, making it into smaller solid material particles.
[0056] The first serration 54 of the blade 51 enables rapid crushing and dissolution of solid materials, while simultaneously breaking up and dispersing bubbles 6. Especially for high-density, agglomerated, and difficult-to-dissolve solid raw materials, the blade 51 of the dispersing paddle 5 has a strong shearing effect and good solid material dispersion and crushing function.
[0057] The dispersing paddle 5, in conjunction with the stirring paddle 4, achieves double-layer stirring. The stirring paddle 4 provides strong axial thrust, while the dispersing paddle 5 provides axial flow force and radial dispersion force, causing the liquid in the reaction vessel to form an axial flow field, thereby fully and uniformly mixing the solids and gases in the reaction vessel.
[0058] To prevent the introduced gas from leaking out along the outer diameter of the stirring shaft 2, such as Figure 2 As shown, the dispersing impeller 5 may also be equipped with a dispersing disk 52, which is located on the outer periphery of the bushing 53 and at the center of the impeller 51. The dispersing disk 52 is used to block the bubbles 6 (such as air bubbles 6) discharged from the central air hole 32 of the gas distributor 31. Figure 5 As shown), the bubbles 6 are radially dispersed along the dispersion disk 52 to the blade 51.
[0059] Combination Figure 8 It can be seen that the diameter of the dispersion disk 52 is smaller than the outer diameter of the multiple dispersion paddles 5, so that the bubbles 6 passing through the dispersion disk 52 are diffused radially to the paddle blades 51.
[0060] The diameter of the dispersion disk 52 can be 1 / 4 to 1 / 6 of the diameter of the dispersion paddle 5. In one embodiment, the diameter of the dispersion disk 52 can be 1 / 5 of the diameter of the dispersion paddle 5. This ensures that the dispersion disk 52 blocks the bubbles 6 while ensuring axial circulation of the liquid in the reaction vessel, preventing liquid diversion due to the excessively large diameter of the dispersion disk 52. The diameter of the dispersion disk 52 is relatively small compared to the dispersion paddle 5, so that the rotational power of the dispersion paddle 5 is not increased when the dispersion disk 52 rotates.
[0061] Furthermore, the outer periphery of the dispersion disk 52 may also be provided with a second serration 56. The second serration 56 is used to cut the bubbles, causing the bubbles to break into smaller bubbles. Solid substances that pass through the second serration 56 can also be cut by the second serration 56 to form smaller solid substances.
[0062] The dispersion disk 52 is used to block the gas discharged from the central vent 32 of the gas distributor 31 from backflowing along the outer periphery of the stirring shaft 2. The second serration 56 of the dispersion disk 52 allows the dispersion disk 52 to also have a strong shearing force, so as to cut solid materials and shear bubbles to break them up and disperse them.
[0063] The stirring device of this invention uses a gas distributor 31 located at the second end 22 of the stirring shaft 2 to cooperate with the dispersion paddle 5 to break the gas and solid matter in the reaction vessel into a smaller volume and disperse it into the liquid reactant, so that more gas is dissolved into the liquid reactant, thereby allowing the solid matter, gas and liquid reactant mixed in the liquid to react fully and leach out the desired solid matter.
[0064] Specifically, the gas distributor 31 is provided with a central vent 32 and a dispersing vent 33. The gas discharged from the central vent 32 can disturb the solid material located in the central area at the bottom of the reaction vessel, causing it to flow with the liquid and preventing the solid material from settling and accumulating at the bottom of the reaction vessel. The dispersing vent 33 can complete the radial guidance and initial crushing of the gas.
[0065] The bubble hole 55 provided at the end 58 of the blade 51 of the dispersing paddle 5, the first serration 54 provided near the gas distributor 31 on the blade 51, and the dispersing disk 52 provided at the center of the dispersing paddle 5, when the dispersing paddle 5 rotates, the dispersing disk 52 can block the overflowing gas; the axial driving force and radial dispersing force of the dispersing paddle 5 form a liquid flow field in the reaction vessel, achieving a better solid-liquid suspension effect.
[0066] The liquid flow field mixes solid materials and gas bubbles discharged from the gas distributor 31, which flow through the dispersion paddle 5. The dispersion paddle 5 further shears the bubbles into smaller bubbles, and at the same time further cuts the solid materials into smaller solid materials, so as to achieve full mixing of solid, liquid and gas phases, improve leaching efficiency and effectively increase production capacity.
[0067] Furthermore, the angle design of the blade 51 can reduce the power loss of the dispersing blade 5 rotation while maintaining the axial thrust and radial dispersing force of the dispersing blade 5, thereby reducing production costs.
[0068] The technical scope of this utility model is not limited to the contents of the above description. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the scope of this utility model.
Claims
1. A stirring device, characterized in that, The stirring device includes a stirring shaft (2), a dispersing paddle (5) located near the end of the stirring shaft (2), and a gas distributor (31) located at the end of the stirring shaft (2). An air inlet channel (23) is provided inside the stirring shaft (2), and the air inlet channel (23) is connected to the gas distributor (31). The dispersing paddle (5) includes a bushing (53) fitted onto the stirring shaft (2), a blade (51) disposed on the outer periphery of the bushing (53), and a dispersing disk (52) disposed on the bushing (53). The diameter of the dispersing disk (52) is smaller than the outer diameter of the blade (51).
2. The stirring device of claim 1, wherein The diameter of the dispersion disk (52) is 1 / 4 to 1 / 6 of the outer diameter of the blade (51).
3. The stirring device of claim 1, wherein The outer periphery of the dispersion disk (52) is provided with a second serration (56), which is used to shear bubbles and cut solid substances.
4. The stirring device of claim 1, wherein The blade (51) has a variable cross-section blade shape, and the blade (51) has a root (57) connected to the bushing (53) and an end (58) away from the bushing (53).
5. The stirring device as described in claim 4, characterized in that, The radial angle between the root (57) of the blade (51) and the bushing (53) is 40° to 45°, and the radial angle between the end (58) of the blade (51) and the bushing (53) is 10° to 15°.
6. The stirring device as described in claim 4, characterized in that, The end (58) of the blade (51) is provided with bubble holes (55).
7. The stirring device as described in claim 6, characterized in that, The bubble hole (55) has an inlet (61) and an outlet (62), the diameter of the inlet (61) is larger than the diameter of the outlet (62), and the diameter of the bubble hole (55) gradually decreases from the inlet (61) to the outlet (62).
8. The stirring device as described in claim 1, characterized in that, The blade (51) has a first serration (54) on the side near the gas distributor (31), the first serration (54) being used to shear bubbles and cut solid substances.
9. The stirring device as described in claim 1, characterized in that, The gas distributor (31) includes a diffuser (34) connected to the end of the stirring shaft (2) and a dispersion part (35) connected to the diffuser (34). The diffuser (34) and the dispersion part (35) are provided with a central air hole (32), and the dispersion part (35) is provided with a plurality of dispersion air holes (33) in the radial direction.
10. The stirring device as described in claim 9, characterized in that, The dispersion section (35) is a mesh plate structure, and the dispersion pores (33) account for 40% to 80% of the total area of the mesh plate.