Powder-liquid mixing equipment

Abstract

This application relates to the field of production equipment technology, and more particularly to a powder-liquid mixing device. A powder-liquid mixing device includes a shell, a first impeller assembly, and a second impeller assembly. The shell encloses a cavity, which includes a powder inlet cavity and a liquid inlet cavity communicating with the powder inlet cavity. The shell is provided with a powder inlet communicating with the powder inlet cavity and a liquid inlet communicating with the liquid inlet cavity. The first impeller assembly includes a dispersing impeller, rotatably disposed within the powder inlet cavity, which disperses the powder entering the powder inlet cavity during rotation. The second impeller assembly includes a mixing and dispersing impeller, rotatably disposed within the liquid inlet cavity, which drives the liquid entering the liquid inlet cavity to rotate during rotation, thereby mixing the powder dispersed by the dispersing impeller with the liquid to form a slurry. The powder-liquid mixing device provided by this application solves the problem of insufficient mixing of powder and liquid, resulting in large particle agglomerates.

Description

Technical Field

[0001] This application relates to the field of production equipment technology, and in particular to a powder-liquid mixing device. Background Technology

[0002] In the lithium battery manufacturing process, the slurry preparation process, as the most initial step, has a significant impact on the quality of the resulting slurry. In the lithium battery slurry preparation process, powder is typically fed into a liquid and mixed and dispersed in a powder-liquid mixing device to obtain a homogeneous slurry. The more homogeneous the slurry, the higher the quality of the prepared lithium battery.

[0003] In the relevant pulping process, after the powder and liquid enter the mixing equipment through the feed inlet, the slurry formed after the powder and liquid are mixed may form large particle agglomerates in the slurry due to insufficient dispersion of the powder. Since there is a high-speed rotating impeller inside the powder-liquid mixing equipment, the large particle agglomerates will have violent friction and collision with the high-speed rotating impeller, which will generate relatively strong vibration and noise, and even more serious situations such as material blockage or backflow. Summary of the Invention

[0004] This application discloses a powder-liquid mixing device that can prevent the formation of large particle agglomerates when powder is mixed with powder and liquid, thereby improving the uniformity of the slurry formed by mixing powder and liquid, and thus improving the quality of the slurry.

[0005] To achieve the above objectives, this application discloses a powder-liquid mixing device, comprising:

[0006] The housing encloses a cavity, the cavity including a powder inlet cavity and a liquid inlet cavity communicating with the powder inlet cavity, the housing being provided with a powder inlet communicating with the powder inlet cavity and a liquid inlet communicating with the liquid inlet cavity;

[0007] The first impeller assembly includes a dispersing impeller, which is rotatably disposed in the powder inlet cavity. The dispersing impeller is used to disperse the powder entering the powder inlet cavity through the powder inlet when rotating.

[0008] The second impeller assembly includes a mixing and dispersing impeller, which is rotatably disposed within the liquid inlet chamber. The mixing and dispersing impeller is used to drive the liquid entering the liquid inlet chamber through the liquid inlet to rotate when rotating, so as to mix the powder dispersed by the dispersing impeller with the liquid to form a slurry.

[0009] The first impeller group's dispersing impellers can disperse the powder; in other words, the dispersing impellers can break down large agglomerates in the powder into smaller particles, and the powder forms an annular mist under the rotation of the first impeller group. The second impeller group's mixing and dispersing impellers rotate, causing the liquid to form an annular vortex, while simultaneously mixing the annular mist with the annular vortex to form a slurry.

[0010] Understandably, the formation of annular powder mist improves the uniformity of the powder. At the same time, the annular vortex formed by the liquid increases the contact area with the powder, avoiding the problem of insufficient mixing of powder and liquid to form large particle agglomerates during the process of mixing powder and liquid to form slurry.

[0011] Optionally, the first impeller assembly further includes a powder-absorbing impeller, which is rotatably disposed in the powder inlet cavity and coaxially disposed with the dispersing impeller. When the powder-absorbing impeller rotates, it generates a suction force from the powder inlet towards the powder inlet cavity.

[0012] When the powder-absorbing impeller rotates, it generates a suction force from the powder inlet to the powder inlet cavity. Under the action of the suction force, the powder moves away from the powder inlet in the powder inlet cavity, preventing the powder from escaping from the powder inlet cavity and thus avoiding powder waste.

[0013] Optionally, the powder-absorbing impeller is located on the side of the dispersing impeller opposite to the powder inlet.

[0014] After being dispersed by the dispersing impeller, the powder forms an annular mist under the rotation of the impeller. If the annular mist is not subjected to other forces, the portion of the annular mist near the powder inlet may escape from the powder inlet cavity. When the suction impeller is positioned on the side of the dispersing impeller away from the powder inlet, the suction force provided by the suction impeller in the direction from the powder inlet to the powder inlet cavity causes the entire annular mist to move in the same direction, preventing the portion of the annular mist near the powder inlet from escaping from the powder inlet cavity and thus avoiding powder waste.

[0015] Understandably, when the powder moves from the powder inlet towards the powder inlet cavity, it may not come into contact with the dispersing impeller, meaning that large particle agglomerates may remain undispersed. Therefore, when the annular powder mist moves into the rotation path of the suction impeller under the action of suction, the suction impeller can further disperse the powder in the annular powder mist. In other words, the suction impeller can further reduce the possibility of large particle agglomerates in the annular powder mist, thus further improving the uniformity of the powder.

[0016] Optionally, the first impeller assembly further includes:

[0017] A powder conveying impeller is rotatably disposed in the powder inlet chamber and coaxially disposed with the dispersing impeller. The powder conveying impeller is located on the side of the powder suction impeller opposite to the powder inlet. The powder conveying impeller is used to convey the powder material dispersed by the dispersing impeller to the liquid inlet chamber.

[0018] The powder conveying impeller can transport the annular powder mist formed by the powder dispersed by the dispersing impeller from the powder inlet chamber to the liquid inlet chamber. At the same time, the powder conveying impeller can further disperse the annular powder mist, that is, the powder conveying impeller can further reduce the possibility of large particle agglomerates in the annular powder mist, and thus further improve the uniformity of the powder.

[0019] Optionally, the powder-liquid mixing device further includes a powder-liquid separation impeller, which is rotatably disposed between the powder inlet chamber and the liquid inlet chamber. The powder-liquid separation impeller is divided into a first part and a second part along the axial direction of the powder-liquid separation impeller. The first part is located in the powder inlet chamber, and the second part is located in the liquid inlet chamber.

[0020] When liquid flows into the inlet chamber from the inlet, it first contacts the second part of the powder-liquid separator impeller, and forms an annular vortex under the impeller's influence. When the annular powder mist moves from the powder inlet chamber towards the liquid inlet chamber to the first part of the powder-liquid separator impeller, it comes into contact with the annular vortex. At this point, the portion of the annular powder mist in contact with the vortex mixes, while the portion that doesn't mix with the vortex continuously moves towards it under the conveying action of the powder conveying impeller. This ensures that the annular powder mist continuously mixes with the vortex, thus continuously forming a slurry.

[0021] Understandably, to avoid interference between the second impeller assembly and the powder inlet cavity during rotation, a gap exists between the second impeller assembly and the powder inlet cavity in the axial direction. If the annular powder mist is directly fed into the liquid inlet cavity by the powder conveying impeller, some of the annular powder mist may move to the liquid inlet and escape from it; it may also come into contact with the liquid that has not formed an annular vortex, directly forming large particle agglomerates. Therefore, the powder-liquid separation impeller can act as a transition between the annular powder mist and the annular vortex, preventing the annular powder mist from directly entering the liquid inlet cavity without being mixed with the annular vortex. At the same time, through the transition of the powder-liquid separation impeller, both the powder-liquid separation impeller and the mixing and dispersing impeller flexibly disperse the slurry, preventing the slurry from rapidly increasing in temperature due to excessive mixing and dispersion.

[0022] Optionally, the outer diameter of the mixing and dispersing impeller is larger than the outer diameter of the powder-liquid separation impeller.

[0023] The larger the outer diameter of the mixing and dispersing impeller, the more slurry it can contact. In other words, increasing the outer diameter of the mixing and dispersing impeller can improve the mixing efficiency of the slurry, thereby improving the mixing and dispersing effect of powder and liquid.

[0024] Optionally, the powder inlet and the liquid inlet are respectively located on different surfaces of the housing.

[0025] By setting different powder inlets and liquid inlets, undispersed powder can be separated from liquid, preventing undispersed powder from directly mixing with liquid and forming large particle agglomerates.

[0026] Optionally, the powder inlet is located on the top wall of the housing, and the liquid inlet is located on the side wall of the housing.

[0027] By placing the powder inlet on the top wall of the housing, other conveying devices can be connected to the inlet or the powder can be directly fed into the powder inlet cavity by gravity. This reduces the complexity of the powder-liquid mixing equipment while making full use of gravity, thereby reducing energy consumption and saving costs.

[0028] Optionally, the cavity further includes a conveying cavity communicating with the liquid inlet cavity, and the housing is provided with a discharge port communicating with the conveying cavity;

[0029] The powder-liquid mixing equipment also includes a slurry conveying impeller, which is rotatably disposed in the conveying cavity. The slurry conveying impeller is used to output the slurry that enters the conveying cavity through the liquid inlet cavity from the outlet.

[0030] The impeller in the slurry conveying system provides centrifugal force as it rotates. Under the action of centrifugal force, the slurry is quickly discharged from the conveying chamber through the outlet, preventing the slurry from agglomerating and forming large particle agglomerates within the conveying chamber. It can be understood that while providing centrifugal force, the impeller can also further agitate the slurry, thereby improving its uniformity.

[0031] Optionally, the slurry conveying impeller has a first end and a second end arranged opposite to each other, the first end facing the liquid inlet cavity, and the slurry conveying impeller is provided with a plurality of first blades spaced apart in the circumferential direction. Each of the plurality of first blades extends from the first end to the second end, and the distance between two adjacent first blades continuously increases from the first end to the second end.

[0032] The first blade increases the outer diameter of the slurry conveying impeller, thus reducing the distance between the inner wall of the slurry conveying cavity and the outer diameter of the slurry conveying impeller. This prevents the slurry at the inner wall of the slurry conveying cavity from experiencing insufficient centrifugal force due to an excessively large gap between it and the impeller, which would otherwise cause slurry deposition on the inner wall of the slurry conveying cavity. Simultaneously, the first blade increases the contact area between the slurry and the impeller, thereby improving the conveying efficiency of the slurry conveying impeller.

[0033] In addition, the distance between two adjacent first blades increases continuously from the first end to the second end, which can create a large spatial difference, prevent the slurry from clogging between two adjacent first blades, and avoid reducing the service life of the powder-liquid mixing equipment.

[0034] Optionally, the slurry conveying impeller is provided with a plurality of second blades spaced apart in the circumferential direction, and at least one second blade is provided between two adjacent first blades, wherein the extension length of the second blade in the direction from the first end to the second end is less than that of the first blade.

[0035] The second blade, which extends less than the first blade in the direction from the first end to the second end, further increases the spatial difference, thereby helping to improve the uniformity of the slurry.

[0036] Optionally, an agitation part is provided on the end face of the second end.

[0037] An agitator is provided on the second end face. When the conveying impeller rotates, the agitator rotates synchronously with the conveying impeller. When the agitator rotates, it agitates the slurry located at the bottom of the conveying cavity, thereby preventing the slurry from depositing at the bottom of the conveying cavity and further preventing the formation of large particle agglomerates at the bottom of the conveying cavity.

[0038] Optionally, the agitating part is a spiral bar protruding from the end face of the second end.

[0039] Optionally, the powder-liquid mixing device further includes a filter element, which is disposed between the conveying cavity and the liquid inlet cavity and separates the conveying cavity from the liquid inlet cavity. The filter element has through holes, which are configured as a mesh, and the conveying cavity and the liquid inlet cavity are connected through the through holes.

[0040] When the slurry, after being stirred by the mixing and dispersing impeller, passes through the mesh-like through-holes, the mesh disperses the slurry. After the slurry is conveyed to the conveying chamber through the filter element, the conveying impeller drives the slurry to be remixed. The above process of dispersing and then mixing the slurry can improve the uniformity of the slurry and reduce its fineness.

[0041] Optionally, the powder-liquid mixing device further includes:

[0042] Drive components;

[0043] A rotating shaft is rotatably disposed in the cavity. The driving member is used to drive the rotating shaft to rotate. The dispersing impeller, the mixing and dispersing impeller, and the slurry conveying impeller are all disposed on the rotating shaft.

[0044] The dispersing impeller, mixing and dispersing impeller, and slurry conveying impeller are all mounted on the same rotating shaft. When the shaft rotates, it drives the dispersing impeller, mixing and dispersing impeller, and slurry conveying impeller to rotate synchronously on the same shaft, reducing the number of transmission components and simplifying the powder-liquid mixing equipment. Simultaneously, the powder is thoroughly dispersed and mixed with the liquid to form a slurry in a short time. The slurry, after thorough mixing and dispersion, is quickly output from the powder-liquid mixing equipment, preventing slurry deposition within the equipment.

[0045] Optionally, the rotating shaft is vertically arranged in the cavity, and the dispersing impeller, the mixing and dispersing impeller, and the slurry conveying impeller are arranged sequentially from top to bottom.

[0046] After being dispersed by the dispersing impeller, the powder falls under gravity to the mixing and dispersing impeller and mixes with the liquid to form a slurry. The slurry then sinks under gravity to the slurry conveying impeller and is output by it. Inside the powder-liquid mixing equipment, the powder, liquid, and slurry are conveyed and transferred by gravity-driven conveying components, further reducing the complexity of the powder-liquid mixing equipment and simultaneously reducing energy consumption and saving costs.

[0047] Optionally, the blade twist angle of the dispersing impeller is in the range of 20°-80°;

[0048] And / or,

[0049] The blade twist angle of the mixing and dispersing impeller is in the range of 20°-80°;

[0050] And / or,

[0051] The torsion angle of the slurry conveying impeller is in the range of 20°-80°.

[0052] When the blade twist angle of the dispersing impeller is less than 20°, the probability of the powder not being dispersed by the dispersing impeller increases significantly; when it is greater than 80°, the friction between the blade of the dispersing impeller and the powder increases, and as the blade rotates, the powder may be deposited on the blade.

[0053] When the blade twist angle of a mixing and dispersing impeller is less than 20° or greater than 80°, the mixing and dispersing capacity is significantly reduced. Similarly, when the blade twist angle of a slurry conveying impeller is less than 20° or greater than 80°, the conveying capacity is also significantly reduced.

[0054] Optionally, the cavity further includes a cooling cavity, which is provided corresponding to the liquid inlet cavity and / or the conveying cavity to cool the slurry in the liquid inlet cavity and / or the conveying cavity.

[0055] During the mixing and dispersing of the slurry by the impeller and the conveying of the slurry by the conveying impeller, a large amount of heat is generated, causing the slurry temperature to rise. After cooling water is introduced into the cooling chamber, the temperature of the slurry can be effectively reduced through heat exchange, preventing the slurry from deteriorating due to overheating, thereby avoiding a decrease in slurry quality and yield.

[0056] Compared with the prior art, the beneficial effects of this application are as follows:

[0057] In the powder mixing equipment provided in this application, the dispersing impeller of the first impeller group disperses the powder. In other words, the dispersing impeller breaks down large agglomerates in the powder into small particles, and the powder forms an annular powder mist under the rotation of the first impeller group. The mixing and dispersing impeller of the second impeller group rotates and drives the liquid to form an annular vortex, while the annular powder mist and the annular vortex are mixed to form a slurry.

[0058] Understandably, the formation of annular powder mist improves the uniformity of the powder. At the same time, the annular vortex formed by the liquid increases the contact area with the powder, avoiding the problem of insufficient mixing of powder and liquid to form large particle agglomerates during the process of mixing powder and liquid to form slurry. Attached Figure Description

[0059] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0060] Figure 1 This is a cross-sectional view of the powder-liquid mixing device provided in the embodiments of this application;

[0061] Figure 2 This is a schematic diagram of the powder-liquid mixing device provided in the embodiments of this application;

[0062] Figure 3 yes Figure 1 Enlarged view of point A in the middle;

[0063] Figure 4 This is a front view of the second end of the slurry conveying impeller provided in an embodiment of this application;

[0064] Figure 5 This is a schematic diagram of the structure of the filter element provided in the embodiments of this application.

[0065] Explanation of key figure labels:

[0066] 1-Powder mixing equipment;

[0067] 11-Shell; 111-Cavity; 1111-Powder inlet cavity; 1112-Liquid inlet cavity; 1113-Conveying cavity; 1114-Cooling cavity; 112-Powder inlet; 113-Liquid inlet; 114-Discharge outlet;

[0068] 12-First impeller group; 121-Dispersing impeller; 122-Powder suction impeller; 123-Powder conveying impeller;

[0069] 13-Second impeller assembly; 131-Mixing and dispersing impeller;

[0070] 14-Powder-liquid separation impeller; 141-First part; 142-Second part;

[0071] 15-Slurry conveying impeller; 151-First end; 152-Second end; 153-First blade; 154-Second blade; 155-Agitating part; 1551-Spiral strip;

[0072] 16 - Filter element; 161 - Through hole;

[0073] 17-Rotating shaft. Detailed Implementation

[0074] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0075] In this application, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0076] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0077] The technical solution of this application will be further described below with reference to specific embodiments and accompanying drawings.

[0078] Please refer to the following: Figure 1 and Figure 2 This application provides a powder-liquid mixing device, including a housing 1, a first impeller assembly 12, and a second impeller assembly 13. The housing 1 encloses a cavity 111, which includes a powder inlet cavity 1111 and a liquid inlet cavity 1112 communicating with the powder inlet cavity 1111. The housing 1 is provided with a powder inlet 112 communicating with the powder inlet cavity 1111 and a liquid inlet 113 communicating with the liquid inlet cavity 1112. The first impeller assembly 12 includes a dispersing impeller 121, which is rotatably disposed within the powder inlet cavity 1111. The dispersing impeller 121 is used to disperse the powder entering the powder inlet cavity 1111 through the powder inlet 112 when rotating. The second impeller assembly 13 includes a mixing and dispersing impeller 131, which is rotatably disposed in the liquid inlet chamber 1112. The mixing and dispersing impeller 131 is used to drive the liquid entering the liquid inlet chamber 1112 through the liquid inlet 113 to rotate when rotating, so as to mix the powder dispersed by the dispersing impeller 121 with the liquid to form a slurry.

[0079] The dispersing impeller 121 of the first impeller group 12 can disperse the powder. In other words, the dispersing impeller 121 can break down large agglomerates in the powder into smaller particles, and the powder forms an annular powder mist under the rotation of the first impeller group 12. The mixing and dispersing impeller 131 of the second impeller group 13 rotates and drives the liquid to form an annular vortex, while mixing the annular powder mist with the annular vortex to form a slurry.

[0080] After the powder forms an annular powder mist, the uniformity of the powder is improved. At the same time, the annular vortex formed by the liquid increases the contact area with the powder, avoiding the problem of large particle agglomerates due to insufficient mixing of powder and liquid during the process of mixing powder and liquid to form slurry. It also avoids material blockage caused by excessively high viscosity and solid content of local slurry in the liquid inlet cavity 1112.

[0081] To avoid inconsistent spacing between the inner wall of the powder inlet cavity 1111 of the housing 1 and the corresponding outer periphery of the first impeller assembly 12, which could result in large gaps and allow some powder to pass through without being dispersed by the impeller 121, the powder inlet cavity 1111 can be cylindrical. This ensures that the spacing between the inner wall of the powder inlet cavity 1111 and the outer periphery of the first impeller assembly 12 remains consistent, resulting in a uniform gap. Similarly, to ensure a uniform gap between the inner wall of the liquid inlet cavity 1112 of the housing 1 and the outer periphery of the second impeller assembly 13, the liquid inlet cavity 1112 can also be cylindrical. Of course, in other specific embodiments, the powder inlet cavity 1111 and the liquid inlet cavity 1112 can also be other shapes, which are not limited here.

[0082] Understandably, to avoid an excessively large uniform gap between the inner wall of the powder inlet cavity 1111 of the housing 1 and the outer periphery of the first impeller assembly 12, which would allow large agglomerates in the powder to pass directly through the gap, the gap between the inner wall of the powder inlet cavity 1111 of the housing 1 and the outer periphery of the first impeller assembly 12 can be set to a range of 0.1mm-10mm. When the gap is less than 0.1mm, due to the unavoidable coaxiality error during the actual assembly of the powder-liquid mixing equipment, interference may occur between the inner wall of the powder inlet cavity 1111 of the housing 1 and the first impeller assembly 12. When the gap is greater than 10mm, the probability of large agglomerates forming in the slurry is greatly increased, thereby reducing the quality of the slurry. Of course, in other embodiments, the gap can be set to other ranges, which are not limited here.

[0083] Please continue reading. Figure 1 In some embodiments, the first impeller assembly 12 further includes a powder suction impeller 122, which is rotatably disposed in the powder inlet cavity 1111 and coaxially disposed with the dispersing impeller 121. When rotating, the powder suction impeller 122 generates a suction force from the powder inlet 112 to the powder inlet cavity 1111.

[0084] When the powder-absorbing impeller 122 rotates, it generates a suction force from the powder inlet 112 to the powder inlet cavity 1111. Under the action of the suction force, the powder moves away from the powder inlet 112 in the powder inlet cavity 1111, thus preventing the powder from escaping from the powder inlet 112 and avoiding powder waste.

[0085] In some specific embodiments, the powder-absorbing impeller 122 may be located on the side of the dispersing impeller 121 opposite to the powder inlet 112.

[0086] After being dispersed by the dispersing impeller 121, the powder forms an annular powder mist under the rotation of the dispersing impeller 121. If the annular powder mist is not subjected to other forces, the portion of the annular powder mist near the powder inlet 112 may escape from the powder inlet cavity 1111 through the powder inlet 112. When the powder suction impeller 122 is set on the side of the dispersing impeller 121 away from the powder inlet 112, the suction force provided by the powder suction impeller 122 in the direction from the powder inlet 112 to the powder inlet cavity 1111 causes the entire annular powder mist to move in the direction from the powder inlet 112 to the powder inlet cavity 1111, thus preventing the portion of the annular powder mist near the powder inlet 112 from escaping from the powder inlet cavity 1111 through the powder inlet 112, thereby avoiding powder waste.

[0087] Understandably, when the powder moves in the direction from the powder inlet 112 towards the powder inlet cavity 1111, it may not come into contact with the dispersing impeller 121, meaning that large particle agglomerates may not be dispersed by the dispersing impeller 121. Therefore, when the annular powder mist moves into the rotation path of the powder suction impeller 122 under the action of suction, the powder suction impeller 122 can further disperse the powder in the annular powder mist. In other words, the powder suction impeller 122 can further reduce the possibility of large particle agglomerates in the annular powder mist, thus further improving the uniformity of the powder.

[0088] Please continue reading. Figure 1 In some embodiments, the first impeller assembly 12 further includes a powder conveying impeller 123, which is rotatably disposed in the powder inlet chamber 1111 and coaxially disposed with the dispersing impeller 121. The powder conveying impeller 123 is located on the side of the powder suction impeller 122 away from the powder inlet 112. The powder conveying impeller 123 is used to convey the powder dispersed by the dispersing impeller 121 to the liquid inlet chamber 1112.

[0089] The powder conveying impeller 123 can convey the annular powder mist formed by the powder dispersed by the dispersing impeller 121 from the powder inlet chamber 1111 to the liquid inlet chamber 1112. At the same time, the powder conveying impeller 123 can further disperse the annular powder mist, that is, the powder conveying impeller 123 can further reduce the possibility of large particle agglomerates in the annular powder mist, and thus further improve the uniformity of the powder.

[0090] In some specific embodiments, since the powder is easily dispersed by airflow after atomization and the formation of annular powder mist, to solve this problem, the number of powder conveying impellers 123 can be set to two, thereby enhancing the conveying effect of the powder conveying impellers 123. Simultaneously, to avoid the formation of large particle agglomerates due to insufficient mixing by the mixing and dispersing impellers 131, the number of mixing and dispersing impellers 131 can be set to three, thereby enhancing the mixing and dispersing effect of the mixing and dispersing impellers 131 on the slurry and ensuring that the slurry is fully mixed. Of course, in other embodiments, the number of powder conveying impellers 123 and mixing and dispersing impellers 131 may be different, and this is not limited here.

[0091] Please refer to the following: Figure 1 and Figure 3 In this embodiment of the application, the powder-liquid mixing device further includes a powder-liquid separation impeller 14, which is rotatably disposed between the powder inlet chamber 1111 and the liquid inlet chamber 1112. The powder-liquid separation impeller 14 is divided into a first part 141 and a second part 142 along the axial direction of the powder-liquid separation impeller 14. The first part 141 is located in the powder inlet chamber 1111, and the second part 142 is located in the liquid inlet chamber 1112.

[0092] When liquid flows into the inlet chamber 1112 from the inlet 113, it first contacts the second part 142 of the powder-liquid separator impeller 14, and forms an annular vortex under the drive of the powder-liquid separator impeller 14. When the annular powder mist moves from the powder inlet chamber 1111 in the direction pointing to the inlet chamber 1112 to the first part 141 of the powder-liquid separator impeller 14, the annular powder mist comes into contact with the annular vortex. At this time, the part of the annular powder mist that comes into contact with the annular vortex mixes, while the part of the annular powder mist that does not mix with the annular vortex moves towards the annular vortex under the conveying action of the powder conveying impeller 123, so that the annular powder mist continues to mix with the annular vortex to continuously form a slurry.

[0093] Understandably, to avoid interference between the second impeller assembly 13 and the powder inlet cavity 1111 during rotation, there is a gap between the second impeller assembly 13 and the powder inlet cavity 1111 in the axial direction. If the annular powder mist is directly fed into the liquid inlet cavity 1112 by the powder conveying impeller 123, some of the annular powder mist may move to the liquid inlet 113 and escape from it; it may also come into contact with the liquid that has not formed an annular vortex, thus directly forming large particle agglomerates. Therefore, the powder-liquid separation impeller 14 can play a transitional role in the mixing of the annular powder mist and the annular vortex, preventing the annular powder mist from directly entering the liquid inlet cavity 1112 without being mixed with the annular vortex. At the same time, through the transition of the powder-liquid separation impeller 14, both the powder-liquid separation impeller 14 and the mixing and dispersing impeller 131 flexibly disperse the slurry, preventing the slurry from rapidly increasing in temperature due to excessive mixing and dispersion.

[0094] In some embodiments, the outer diameter of the mixing and dispersing impeller 131 is larger than the outer diameter of the powder-liquid separation impeller 14.

[0095] The larger the outer diameter of the mixing and dispersing impeller 131, the more slurry it can contact. In other words, increasing the outer diameter of the mixing and dispersing impeller 131 can improve the stirring efficiency of the slurry, thereby improving the mixing and dispersing effect of powder and liquid.

[0096] Please continue reading. Figure 1 and Figure 3 In this embodiment of the application, the powder inlet 112 and the liquid inlet 113 are respectively disposed on different surfaces of the housing 1.

[0097] Understandably, if powder and liquid are fed into the powder-liquid mixing equipment through the same inlet, uneven material distribution can lead to some powder being concentrated in a small area of ​​the liquid, increasing the likelihood of large particle agglomerates forming. Setting different powder inlets 112 and liquid inlets 113 can separate the undispersed powder from the liquid, preventing the undispersed powder from directly mixing with the liquid and forming large particle agglomerates.

[0098] In some specific embodiments, the powder inlet 112 can be provided on the top wall of the housing 1, and the liquid inlet 113 can be provided on the side wall of the housing 1.

[0099] By setting the powder inlet 112 on the top wall of the housing 1, other conveying devices can be connected to the inlet or the powder can be directly fed into the powder inlet cavity 1111 by gravity. This reduces the complexity of the powder-liquid mixing equipment and makes full use of gravity, thereby reducing energy consumption and saving costs.

[0100] Meanwhile, to reduce the impact of the liquid on the powder-liquid dispersion impeller and the mixing-dispersion impeller 131 when it flows into the liquid inlet chamber 1112, the centerline of the liquid inlet 113 can be approximately tangent to the outer periphery of the mixing-dispersion impeller 131 when it rotates. That is, the liquid inlet 113 can be approximately tangent to the inner wall of the housing 1 that forms the liquid inlet chamber 1112. When the liquid flows into the liquid inlet chamber 1112 through the liquid inlet 113, the liquid directly contacts the outer periphery of the rotation path of the powder-liquid dispersion impeller and the mixing-dispersion impeller 131. At the same time, the direction of liquid flow is consistent with the tangential direction of the rotation direction of the powder-liquid dispersion impeller and the mixing-dispersion impeller 131, which greatly reduces the impact of the liquid on the powder-liquid dispersion impeller and the mixing-dispersion impeller 131.

[0101] Please refer to it again. Figure 1 and Figure 2To improve the stability and automation of the equipment, in this embodiment, the cavity 111 further includes a conveying cavity 1113 communicating with the liquid inlet cavity 1112, and the housing 1 is provided with a discharge port 114 communicating with the conveying cavity 1113; the powder-liquid mixing equipment also includes a slurry conveying impeller 15, which is rotatably disposed in the conveying cavity 1113, and is used to output the slurry that enters the conveying cavity 1113 through the liquid inlet cavity 1112 through the discharge port 114.

[0102] The slurry conveying impeller 15 provides centrifugal force when rotating. Under the action of centrifugal force, the slurry is quickly output from the conveying chamber 1113 through the discharge port 114, avoiding the slurry from agglomerating and forming large particle agglomerates within the conveying chamber 1113. It can be understood that while providing centrifugal force, the slurry conveying impeller 15 can also agitate the slurry again, thereby improving the uniformity of the slurry.

[0103] Please refer to it again. Figure 1 In this embodiment of the application, the slurry conveying impeller 15 has a first end 151 and a second end 152 arranged opposite to each other. The first end 151 faces the liquid inlet cavity 1112. The slurry conveying impeller 15 is provided with a plurality of first blades 153 at intervals along the circumferential direction. Each of the plurality of first blades 153 extends from the first end 151 to the second end 152, and the distance between two adjacent first blades 153 continuously increases from the first end 151 toward the second end 152.

[0104] The first blade 153 can increase the outer diameter of the slurry conveying impeller 15, thereby reducing the distance between the inner wall of the forming conveying cavity 1113 of the housing 1 and the outer diameter of the slurry conveying impeller 15. This prevents the slurry at the inner wall of the forming conveying cavity 1113 of the housing 1 from experiencing insufficient centrifugal force due to an excessively large gap between it and the slurry conveying impeller 15, which would otherwise cause slurry deposition on the inner wall of the forming conveying cavity 1113 of the housing 1. At the same time, the first blade 153 can increase the contact area between the slurry and the slurry conveying impeller 15, thereby improving the conveying efficiency of the slurry conveying impeller 15.

[0105] In addition, the distance between two adjacent first blades 153 increases continuously from the first end 151 to the second end 152, which can form a large space difference, prevent the slurry from blocking between two adjacent first blades 153, and avoid reducing the service life of the powder-liquid mixing equipment.

[0106] Please continue reading. Figure 1In this embodiment of the application, the slurry conveying impeller 15 is provided with a plurality of second blades 154 at intervals along the circumferential direction, and at least one second blade 154 is provided between two adjacent first blades 153. The extension length of the second blade 154 in the direction from the first end 151 to the second end 152 is less than that of the first blade 153.

[0107] The second blade 154, which extends less than the first blade 153 in the direction from the first end 151 to the second end 152, further increases the spatial difference, thereby helping to improve the uniformity of the slurry.

[0108] Please refer to the following: Figure 1 and Figure 4 In order to prevent the slurry from depositing at the bottom of the conveying cavity 1113, in this embodiment of the application, an agitator 155 is provided on the end face of the second end 152.

[0109] An agitator 155 is provided on the second end 152. When the slurry conveying impeller 15 rotates, the agitator 155 rotates synchronously with the slurry conveying impeller 15. When the agitator 155 rotates, it agitates the slurry located at the bottom of the conveying cavity 1113, thereby preventing the slurry from depositing at the bottom of the conveying cavity 1113 and further preventing the formation of large particle agglomerates at the bottom of the conveying cavity 1113.

[0110] In some specific embodiments, the agitating part 155 is a spiral bar 1551 protruding from the end face of the second end 152. Meanwhile, to ensure that the spiral bar 1551 can uniformly agitate the slurry located at the bottom of the output cavity 111, the number of spiral bars 1551 can be set to four, and the four spiral bars 1551 are evenly spaced around the rotation axis of the slurry conveying impeller 15 on the end face of the second end 152. Of course, in other specific embodiments, the number of spiral bars 1551 can also be set to other values, which are not limited here.

[0111] Please refer to the following: Figure 1 and Figure 5 In this embodiment of the application, the powder-liquid mixing device further includes a filter element 16. The filter element 16 is disposed between the conveying cavity 1113 and the liquid inlet cavity 1112 and separates the conveying cavity 1113 and the liquid inlet cavity 1112. The filter element 16 has a through hole 161, which is set in a mesh shape. The conveying cavity 1113 and the liquid inlet cavity 1112 are connected through the through hole 161.

[0112] When the slurry, after being stirred by the mixing and dispersing impeller 131, passes through the mesh-like through-holes 161, the mesh-like through-holes 161 disperse the slurry. After the slurry is conveyed into the conveying chamber 1113 through the filter element 16, the slurry is remixed by the slurry conveying impeller 15. The above-mentioned process of dispersing and then mixing the slurry can improve the uniformity of the slurry and reduce the fineness of the slurry.

[0113] Please refer to it again. Figure 1 In this embodiment of the application, the powder-liquid mixing device further includes a drive unit (not shown) and a rotating shaft 17. The rotating shaft 17 is rotatably disposed in the cavity 111. The drive unit is used to drive the rotating shaft 17 to rotate. The dispersing impeller 121, the mixing and dispersing impeller 131 and the slurry conveying impeller 15 are all disposed on the rotating shaft 17.

[0114] The dispersing impeller 121, the mixing and dispersing impeller 131, and the slurry conveying impeller 15 are mounted on the same rotating shaft 17. When the rotating shaft 17 rotates, it drives the dispersing impeller 121, the mixing and dispersing impeller 131, and the slurry conveying impeller 15 to rotate synchronously on the same axis, reducing the number of transmission components and simplifying the powder-liquid mixing equipment. Simultaneously, after thorough dispersing, the powder mixes with the liquid in a short time to form a slurry. The slurry, after thorough mixing and dispersion, is quickly output from the powder-liquid mixing equipment, preventing slurry deposition within the equipment.

[0115] Please continue reading. Figure 1 In this embodiment of the application, the rotating shaft 17 is vertically arranged in the cavity 111, and the dispersing impeller 121, the mixing and dispersing impeller 131 and the slurry conveying impeller 15 are arranged sequentially from top to bottom.

[0116] The dispersing impeller 121, the mixing and dispersing impeller 131, and the slurry conveying impeller 15 are arranged in a stacked structure from top to bottom. After being dispersed by the dispersing impeller 121, the powder falls to the mixing and dispersing impeller 131 under the action of gravity and the suction effect generated by the stacked structure, where it mixes with the liquid to form a slurry. The slurry then sinks to the slurry conveying impeller 15 under gravity and is output by the slurry conveying impeller 15. Inside the powder-liquid mixing equipment, the powder, liquid, and slurry are conveyed and transferred by gravity and the suction effect generated by the stacked structure instead of transmission components, further reducing the complexity of the powder-liquid mixing equipment and reducing its energy consumption, thus saving costs.

[0117] In some embodiments, the blade torsion angle of the dispersing impeller 121 is in the range of 20°-80°; and / or, the blade torsion angle of the mixing and dispersing impeller 131 is in the range of 20°-80°; and / or, the torsion angle of the slurry conveying impeller 15 is in the range of 20°-80°.

[0118] When the blade twist angle of the dispersing impeller 121 is less than 20°, the probability that the powder is not dispersed by the dispersing impeller 121 increases significantly; when it is greater than 80°, the friction between the blade of the dispersing impeller 121 and the powder increases, and as the blade rotates, the powder may be deposited on the blade.

[0119] When the blade twist angle of the mixing and dispersing impeller 131 is less than 20° or greater than 80°, the mixing and dispersing ability is significantly reduced. Similarly, when the blade twist angle of the slurry conveying impeller 15 is less than 20° or greater than 80°, the conveying capacity is also significantly reduced.

[0120] Of course, in other embodiments, the torsion angles of the dispersing impeller 121, the mixing and dispersing impeller 131, and the slurry conveying impeller 15 can also be set to other angles, which are not limited here.

[0121] Please continue reading. Figure 1 In this embodiment of the application, a cooling chamber 1114 is provided on the housing 1. The cooling chamber 1114 is provided corresponding to the liquid inlet chamber 1112 and / or the conveying chamber 1113 to cool down the slurry in the liquid inlet chamber 1112 and / or the conveying chamber 1113.

[0122] During the mixing and dispersing impeller 131's stirring of the slurry and the slurry conveying impeller 15's conveying of the slurry, a large amount of heat is generated, causing the slurry temperature to rise. After cooling water is introduced into the cooling chamber 1114, the temperature of the slurry can be effectively reduced through heat exchange, preventing the slurry from heating up and denaturing, thereby avoiding a decrease in the slurry's quality and pass rate.

[0123] The working principle of the powder-liquid mixing equipment provided in this application is as follows:

[0124] The powder enters the powder inlet chamber 1111 through the powder inlet 112. The powder is first initially dispersed by the dispersing impeller 121 and then falls further under the suction force provided by the powder suction impeller 122. The powder is then further dispersed by the powder suction impeller 122 and the powder conveying impeller 123 in sequence. At the same time, the powder conveying impeller 123 conveys the powder to the part of the powder-liquid separation impeller 14 located in the powder inlet chamber 1111. During the above-mentioned dispersion process, the powder forms an annular powder mist.

[0125] The liquid is conveyed to the inlet chamber 1112 through the inlet 113, and an annular vortex is formed by the rotation of the part of the powder-liquid separator impeller 14 located in the inlet chamber 1112. The annular powder mist comes into contact with the annular vortex and mixes continuously to form a slurry. The slurry sinks and is continuously stirred by the mixing and dispersing impeller 131 to achieve the effect of mixing and dispersing.

[0126] After the slurry is stirred by the mixing and dispersing impeller 131, it sinks to the slurry conveying impeller 15 under the dispersing effect of the mesh-like through holes 161 of the filter element 16, and is quickly output from the discharge port 114 under the rotation of the slurry conveying impeller 15.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A powder-liquid mixing device, characterized in that, The powder-liquid mixing equipment includes: The housing encloses a cavity, the cavity including a powder inlet cavity and a liquid inlet cavity communicating with the powder inlet cavity, the housing being provided with a powder inlet communicating with the powder inlet cavity and a liquid inlet communicating with the liquid inlet cavity; The first impeller assembly includes a dispersing impeller, which is rotatably disposed in the powder inlet cavity. The dispersing impeller is used to disperse the powder entering the powder inlet cavity through the powder inlet when rotating. The first impeller assembly also includes a powder-absorbing impeller, which is rotatably disposed in the powder inlet cavity and coaxially disposed with the dispersing impeller. When the powder-absorbing impeller rotates, it generates a suction force from the powder inlet to the powder inlet cavity. The powder-absorbing impeller is located on the side of the dispersing impeller away from the powder inlet. The powder-liquid mixing device further includes a powder-liquid separation impeller, which is rotatably disposed between the powder inlet chamber and the liquid inlet chamber. The powder-liquid separation impeller is divided into a first part and a second part along the axial direction of the powder-liquid separation impeller. The first part is located in the powder inlet chamber, and the second part is located in the liquid inlet chamber. When liquid flows into the liquid inlet chamber from the liquid inlet, the liquid first contacts the second part of the powder-liquid separation impeller. The second impeller assembly includes a mixing and dispersing impeller, which is rotatably disposed within the liquid inlet chamber. The mixing and dispersing impeller is used to drive the liquid entering the liquid inlet chamber through the liquid inlet to rotate when rotating, so as to mix the powder dispersed by the dispersing impeller with the liquid to form a slurry.

2. The powder-liquid mixing equipment according to claim 1, characterized in that, The first impeller assembly also includes: A powder conveying impeller is rotatably disposed in the powder inlet chamber and coaxially disposed with the dispersing impeller. The powder conveying impeller is located on the side of the powder suction impeller opposite to the powder inlet. The powder conveying impeller is used to convey the powder material dispersed by the dispersing impeller to the liquid inlet chamber.

3. The powder-liquid mixing equipment according to claim 1, characterized in that, The outer diameter of the mixing and dispersing impeller is larger than the outer diameter of the powder-liquid separation impeller.

4. The powder-liquid mixing equipment according to claim 1, characterized in that, The powder inlet and the liquid inlet are respectively located on different surfaces of the housing.

5. The powder-liquid mixing equipment according to claim 4, characterized in that, The powder inlet is located on the top wall of the housing, and the liquid inlet is located on the side wall of the housing.

6. The powder-liquid mixing equipment according to any one of claims 1-5, characterized in that, The cavity also includes a conveying cavity communicating with the liquid inlet cavity, and the housing is provided with a discharge port communicating with the conveying cavity; The powder-liquid mixing equipment also includes a slurry conveying impeller, which is rotatably disposed in the conveying cavity. The slurry conveying impeller is used to output the slurry that enters the conveying cavity through the liquid inlet cavity from the outlet.

7. The powder-liquid mixing equipment according to claim 6, characterized in that, The slurry conveying impeller has a first end and a second end arranged opposite to each other. The first end faces the liquid inlet cavity. The slurry conveying impeller has a plurality of first blades spaced apart in the circumferential direction. Each of the plurality of first blades extends from the first end to the second end, and the distance between two adjacent first blades continuously increases from the first end to the second end.

8. The powder-liquid mixing equipment according to claim 7, characterized in that, The slurry conveying impeller is provided with a plurality of second blades spaced apart in the circumferential direction, and at least one second blade is provided between two adjacent first blades. The extension length of the second blade in the direction from the first end to the second end is less than that of the first blade.

9. The powder-liquid mixing equipment according to claim 7, characterized in that, A stirring part is provided on the end face of the second end.

10. The powder-liquid mixing equipment according to claim 9, characterized in that, The stirring part is a spiral bar that protrudes from the end face of the second end.

11. The powder-liquid mixing equipment according to claim 6, characterized in that, The powder-liquid mixing device further includes a filter element, which is disposed between the conveying cavity and the liquid inlet cavity and separates the conveying cavity from the liquid inlet cavity. The filter element has through holes, which are arranged in a mesh shape, and the conveying cavity and the liquid inlet cavity are connected through the through holes.

12. The powder-liquid mixing equipment according to claim 6, characterized in that, The powder-liquid mixing equipment also includes: Drive components; A rotating shaft is rotatably disposed in the cavity. The driving member is used to drive the rotating shaft to rotate. The dispersing impeller, the mixing and dispersing impeller, and the slurry conveying impeller are all disposed on the rotating shaft.

13. The powder-liquid mixing equipment according to claim 12, characterized in that, The rotating shaft is vertically arranged in the cavity, and the dispersing impeller, the mixing and dispersing impeller, and the slurry conveying impeller are arranged sequentially from top to bottom.

14. The powder-liquid mixing equipment according to claim 6, characterized in that, The blade twist angle of the dispersing impeller is in the range of 20°-80°; And / or, The blade twist angle of the mixing and dispersing impeller is in the range of 20°-80°; And / or, The torsion angle of the slurry conveying impeller is in the range of 20°-80°.

15. The powder-liquid mixing equipment according to claim 6, characterized in that, The cavity further includes a cooling cavity, which is provided corresponding to the liquid inlet cavity and / or the conveying cavity to cool the slurry in the liquid inlet cavity and / or the conveying cavity.

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