Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
  • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
  • B01F27/808—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers driven from the bottom of the receptacle
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
  • B01F23/50—Mixing liquids with solids
  • B01F23/53—Mixing liquids with solids using driven stirrers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
  • B01F23/50—Mixing liquids with solids
  • B01F23/565—Mixing liquids with solids by introducing liquids in solid material, e.g. to obtain slurries
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
  • B01F27/50—Pipe mixers, i.e. mixers wherein the materials to be mixed flow continuously through pipes, e.g. column mixers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
  • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
  • B01F27/94—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with rotary cylinders or cones
  • B01F27/941—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with rotary cylinders or cones being hollow, perforated or having special stirring elements thereon
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
  • B01F35/71—Feed mechanisms
  • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
  • B01F35/71775—Feed mechanisms characterised by the means for feeding the components to the mixer using helical screws

Definitions

• the present application relates to the field of mixing devices, specifically, to a mixing device and its stirring paddle.
• Some embodiments of the present application propose a mixing device and its stirring paddle to solve the technical problems mentioned in the background technology section above.
• some embodiments of the present application provide a stirring paddle, including: a dispersing disc constructed with a central portion and a plurality of paddle block portions arranged around the central portion; the stirring paddle also includes: a plurality of dispersing columns, each disposed on a paddle block portion; a diversion cone disposed at the top of the central portion and forming a first diversion surface.
• the central portion is constructed to be centrally symmetric relative to a central axis;
• the paddle block portion is constructed with a forward diversion surface and a reverse diversion surface, which are arranged on opposite sides of one paddle block portion and both intersect obliquely with the central axis;
• a forward diversion surface of one paddle block portion and a reverse diversion surface of another paddle block portion form a diversion channel that extends obliquely in the axial direction and opens radially to guide at least a portion of the slurry to the bottom of the dispersing disc when the dispersing disc rotates;
• the first diversion surface is constructed as at least a portion of a conical surface.
• the forward diversion surface intersects obliquely with the radial direction of the central axis, and the forward diversion surface is constructed as a streamlined curved surface.
• the reverse diversion surface intersects obliquely with the radial direction of the central axis.
• the reverse diversion surface is constructed as a streamlined curved surface.
• the projection area of the forward diversion surface on a projection plane perpendicular to the central axis is less than or equal to the projection area of the reverse diversion surface on a projection plane perpendicular to the central axis.
• the top of the paddle block portion is constructed as an arc-shaped surface; the tops of several paddle block portions are constructed on one arc-shaped surface.
• the dispersing column includes: a column top disposed above the paddle block portion; a column bottom disposed below the paddle block portion; wherein, the dispersing column has at least a cylindrical surface parallel to the central axis.
• some embodiments of the present application provide a mixing device, including: a mixing tank body forming a mixing space; the mixing device further includes: a stirring paddle as described in any of the preceding embodiments, and the stirring paddle is disposed at the bottom of the mixing space of the mixing tank body.
• the mixing device further includes: a baffle plate for blocking the circumferential flow of slurry driven by the stirring paddle at the inner wall of the mixing tank body.
• the beneficial aspects of the present application are: providing a mixing device and its stirring paddle that effectively improve the stirring and kneading effect on slurry, thereby changing the quality of the slurry.
• the stirring device 100 of the present disclosure comprises a stirring tank body 101, a feed pipe 102, a stirring blade 113, a stirring shaft 103, and a stirring motor (not shown in the figure).
• the stirring tank body 101 is configured to have a stirring space 101a.
• the feed pipe 102 is formed with a powder inlet 102a, a liquid inlet 102b, and the stirring space 101a is connected to a feed channel 102c. Through the feed channel 102c, powder and liquid materials are input into the stirring space 101a.
• the stirring blade 113 is rotatably mounted in the stirring space 101a to stir the mixture of powder and liquid in the stirring space 101a to achieve uniform mixing.
• the stirring shaft 103 extends partially into the stirring space 101a and forms a non-rotating connection with the stirring blade 113. Under the drive (direct or indirect) of the stirring motor, the stirring shaft 103 rotates around a central axis, thereby driving the stirring blade 113 to rotate and stir the mixture of powder and liquid in the stirring space 101a at a high speed. After uniform mixing, the slurry is output through an outlet 1011d, and the outlet 1011d remains closed during stirring.
• the powder entering the feed channel 102c is prone to agglomeration, affecting its flowability within the feed channel 102c. If directly input into the stirring space 101a, it will significantly affect the dispersion efficiency.
• the stirring device 100 suitable for high-solid-content slurry of the present disclosure further includes: a feed paddle 104, a feed shaft 105, a feed motor 106, and a reducer 114.
• the feed shaft 105 extends partially into the feed channel 102c, and the feed motor 106 cooperates with the reducer 114 to drive the feed shaft 105 to rotate in the feed channel 102c.
• the feed paddle 104 is rotatably installed in the feed channel 102c and mounted on the feed shaft 105 to rotate along with the feed shaft 105, allowing the feed paddle 104 to stir and the powder entering through the powder inlet 102a is dispersed in the feed channel 102c.
• the feed pipe 102 is formed with multiple powder inlets 102a these powder inlets 102a are located at different circumferential positions, allowing for the simultaneous introduction of the same or different types of powder.
• the feed paddle 104 can disperse and uniformly mix the introduced powder.
• the feed paddle 104 comprises a sleeve portion 1041, a spiral portion 1042, and connecting portions 1043.
• the sleeve portion 1041 is mounted on the feed shaft 105 and connected to the feed shaft 105 via a key connection to achieve non-rotating cooperation with the feed shaft 105.
• the feed shaft 105 is formed with a stepped portion 1051 to limit the installation position of the sleeve portion 1041 on the feed shaft 105.
• the spiral portion 1042 is configured to extend approximately along a spiral line, and multiple connecting portions 1043 are used to connect the spiral portion 1042 to the sleeve portion 1041 in a spiral wrapping manner connect the sleeve portion 1041.
• both the spiral portion 1042 and the connecting portions 1043 adopt a streamlined structural design with a smooth outer surface, reducing resistance to the powder and enabling rapid and uniform mixing of the powder in a small space, with less tendency for the powder to accumulate in the feed channel 102c.
• the stirring device 100 for high-solid-content slurries of the present disclosure further includes: a wetting pipe 107, several wetting paddles 108, and several wetting columns 109.
• the wetting pipe 107 is formed with the feed channel 102c connected a wetting channel 107a.
• the wetting channel 107a is located between the feed channel 102c and the stirring space 101a.
• the liquid inlet 102b is located at an axial position different from the powder inlet 102a, and the liquid inlet 102b is positioned in the feed channel 102c, there is a location near the wetting channel 107a, allowing liquid fed through the liquid inlet 102b to quickly enter the wetting channel 107a.
• the wetting paddles 108 rotate about a central axis and are set in the wetting channel 107a. These wetting paddles 108 are located at different axial positions and are used to stir the mixture of powder and liquid in the wetting channel 107a during rotation.
• the axial, radial, and circumferential directions are all relative positions referenced to the central axis.
• wetting columns 109 are arranged between two wetting paddles 108, and each wetting column 109 is configured as a cylinder extending in the radial direction of the central axis. This allows the mixture of powder and liquid flowing through the wetting channel 107a to be diverted at the wetting columns 109.
• several wetting columns 109 located between two wetting paddles 108 are arranged at different circumferential positions, and the wetting columns 109 are positioned between the feed shaft 105 and the wetting pipe 107.
• the mixture of powder and liquid is diverted by the agitation of the wetting paddles 108, there are multiple wetting columns 109, ensuring thorough mixing and sufficient wetting of the liquid with the powder.
• the gap between the wetting paddles 108 and the wetting columns 109 is set at 3mm to 5mm, allowing the mixture of powder and liquid to be compressed between the wetting paddles 108 and the wetting columns 109, which accelerates the wetting process.
• each wetting paddle 108 includes a connecting shaft 1081 and a paddle blade 1082.
• the connecting shaft 1081 is fitted onto the feed shaft 105 and connected to the feed shaft 105 through a key to prevent rotation relative to the feed shaft 105.
• Multiple wetting paddles 108 are sequentially fitted onto the feed shaft 105, and near the assembly section 1011,the assembly part 1041 is close to an impregnated paddle 108's connecting shafts 1081connected with the assembly part 1041
• a cover 111 is connected to its end to completely fix the relative position of the connecting shafts 1081 with the shaft.
• the wetting paddles 108 and the feed paddles 104 are connected to the same feed shaft 105, ensuring their synchronous rotation.
• the wetting paddle 108 has paddle blade portions 1082 arranged at multiple circumferential positions of the connecting shaft portion 1081, and they are set symmetrically relative to the central axis.
• Each paddle blade 1082 has a paddle surface that intersects the central axis at an angle, enabling the paddle blades 1082 to exert both axial and centrifugal forces on the mixture of powder and during the rotation of the wetting paddles 108, liquid is present in the wetting channel 107a.
• the axial force pushes part of the mixture towards the wetting columns 109, while the centrifugal force pushes another part of the mixture towards the inner wall of the wetting pipe 107.
• the gap between the paddle blade 1082 and the inner wall of the wetting pipe 107 is set at 3mm to 5mm, enabling the mixture of powder and liquid to be pushed towards the inner wall of the wetting pipe 107 by the centrifugal force and compressed between the paddle blade 1082 and the wetting pipe 107, further accelerating the wetting process.
• the paddle surface of the paddle blade 1082 is constructed with at least one curved surface, reducing the resistance between the paddle surface and the mixture, allowing the mixture to flow smoothly over the paddle surface and accelerating the mixing process.
• the paddle surface of the paddle blade 1082 is divided into a forward paddle surface 1082a and a reverse paddle surface 1082b, the forward paddle surface 1082a and the reverse paddle surface 1082b located on opposite sides of the paddle blade 1082.
• the forward paddle surface 1082a exerts a thrust on the mixture, while the reverse paddle surface 1082b guides the flow of the mixture passing over the paddle blade 1082.
• the paddle blade 1082 also includes a transition surface 1082c, and the transition surface 1082c is located between the top and bottom of the forward paddle surface 1082a and the reverse paddle surface 1082b. As shown in the figure, the transition surface 1082c intersects the central axis at an angle. With this design, part of the mixture pushed by the forward paddle surface 1082a flows towards the stirring space 101a is adjacent to or near the transition surface 1082c, allowing this part of the mixture to be kneaded and mixed evenly between the transition surface 1082c and the wetting column.
• transition surface 1082c near the feed channel 102c forms the forward paddle surface 1082a, there exists a cutting angle 1082d, during the rotation of the paddle blade 1082, the mixture in the wetting channel 107a is segmented and allowing part of the mixture to flow along this side of the transition surface 1082c, further promoting the mixing of the mixture.
• the wetting pipe 107 comprises several flange pipes 1071 , and these flange pipes 1071 are connected sequentially to form the wetting pipe 107.
• the wetting paddles 108 are accommodated in the space enclosed by the flange pipes 1071. This method allows for easy installation by sequentially fitting the wetting paddles 108 and the wetting pipe 107 onto the feed shaft 105.
• the stirring device 100 of this application includes a wetting ring 110 that is designed with a ring structure and fitted onto the outer side of the feed shaft 105.
• One end of the wetting column 109 is connected to the wetting pipe 107, while the other end is connected to the wetting ring 110, and the wetting ring 110 effectively connecting the wetting columns 109 located at the same axial position into a single unit, enhancing the stability of the wetting columns 109.
• the feed pipe 102 is formed with multiple liquid inlet ports 102b, the liquid inlet ports 102b located at different circumferential positions.
• This design facilitates the simultaneous input of the same or different types of liquid, enabling uniform liquid input into the wetting pipe in the circumferential direction and improving wetting efficiency.
• a portion of the feed shaft 105 is fitted with a bearing seat 112.
• This bearing seat 112 is connected to the feed pipe 102, and accordingly, a reducer 114 is installed onto the bearing seat 112.
• the bearing seat 112 forms an internal space for installing several bearings.
• the stirring tank 101 is also formed with a cooling jacket 101b, the cooling jacket 101b is designed with a cooling cavity 1011a, a liquid inlet 1011b, and a liquid outlet 1011c.
• the cooling cavity 1011a is arranged around the stirring space 101a.
• the liquid inlet 1011b allows coolant to flow into the cooling cavity 1011a, while the liquid outlet 1011c allows coolant to flow out of the cooling cavity 1011a.
• the circulating coolant continuously removes excess heat from the stirring space 101a, preventing temperature rise from causing slurry denaturation.
• the stirring tank 101 comprises an outer tank body 1011 and an inner tank body 1012, with the cooling jacket 101b constructed between the outer tank body 1011 and the inner tank body 1012.
• the stirring tank 101 includes a liquid inlet pipe 1013 and a liquid outlet pipe 1014.
• the liquid inlet pipe 1013 forms the liquid inlet 1011b, while the liquid outlet pipe 1014 forms the liquid outlet 1011c.
• the liquid inlet pipe 1013 extends radially towards the region near the central axis, to enhance heat dissipation efficiency, the coolant residing in the cooling chamber 1011a, which is fed in through the inlet 1011b, is prolonged in its stay, allowing it to fully absorb heat.
• the stirring paddle 113 specifically comprises a dispersion disk 116, several dispersion columns 117, and a flow guide cone 118.
• the dispersion disk 116 is designed with a central portion 1161 and around the perimeter of the central portion 1161, several paddle sections 1162 are arranged.
• the central portion 1161 is constructed to be centrally symmetrical around a central axis.
• Multiple dispersion columns 117 are individually arranged on the paddle sections 1162 and rotate synchronously with the paddle sections 1162.
• the flow guide cone 118 is positioned on the top of the central portion 1161 and forms a first guide surface 1181, which directs the slurry in the upper space of the dispersion disk 116 to flow more smoothly towards the dispersion disk 116, increasing the fluidity of the mixture.
• the dispersion disk 116 rotates at a high speed with the dispersion columns 117, the mixture of powder and liquid is forcibly sheared and dispersed by the dispersion columns 117, and is forcibly thrown towards the inner wall of the inner tank body 1012 at a high speed. Since the rotational speed in the middle region near the central axis of the dispersion columns 117 is low, the mixture in the upper part of the tank inevitably descends to fill the middle region, increasing the fluidity of the mixture within the tank space.
• the dispersion disk 116 is formed with one end of the stirring shaft 103 is partially inserted into the installation hole 116b. It has a mating inner surface 116c formed around the dispersion axis. The part of the stirring shaft 103 inserted into the installation hole 116b forms a mating outer surface 1031 around the shaft axis. After the shaft is inserted into the installation hole 116b and tightened, the mating outer surface 1031 and the mating inner surface 116c form an interference fit to drive the dispersion disk 116 to rotate by friction. Additionally, the dispersion disk 116 and the end of the stirring shaft 103 are connected with fasteners to prevent separation.
• the paddle sections 1162 are constructed with a forward guide surface 1163 and a reverse guide surface 1164, the forward guide surface 1163 and the reverse guide surface 1164 are located on opposite sides of one paddle section 1162 and intersect the central axis at an angle. Between one paddle section 1162's forward guide surface 1163 and another paddle section 1162's reverse guide surface 1164, a guide channel 116a is set The guide channel 116a axially traverses the dispersion disk 116, allowing the dispersion disk 116 to guide at least a portion of the slurry to the bottom of the dispersion disk 116 during rotation.
• the first guide surface is constructed as at least a portion of a conical surface, enhancing the guiding effect of the first guide surface.
• the forward guide surface 1163 cuts through a portion of the mixture and pushes it towards the bottom of the tank space, promoting the flow of the mixture.
• the reverse guide surface 1164 directs the mixture passing through the guide channel 116a.
• the forward guide surface 1163 intersects the radial direction of the central axis at an angle. When rotating, it exerts a radial force on the mixture flowing through the guide channel 116a to throw the mixture out, increasing the fluidity of the mixture.
• the forward guide surface 1163 is constructed as a streamlined curved surface.
• the reverse guide surface 1164 intersects the radial direction of the central axis at an angle. When rotating, it directs a portion of the mixture flowing through the guide channel 116a radially, enhancing the fluidity of the mixture.
• the reverse guide surface 1164 is constructed as a streamlined curved surface. The streamlined curved surface helps reduce resistance.
• the projection area of the forward guide surface 1163 on a projection plane perpendicular to the central axis is less than or equal to the projection area of the reverse guide surface 1164 on a projection plane perpendicular to the central axis. This allows the paddle blades to gradually compress and direct the mixture towards the bottom of the dispersion disk 116 when entering the guide channel 116a.
• the top of the paddle section 1162 is constructed as an arcuate surface; the tops of several paddle sections 1162 are constructed on one arcuate surface. This can further reduce the resistance of the slurry on the dispersion disk 116.
• the dispersion columns 117 include a column top 1171 and a column bottom 1172; wherein, the column top 1171 is positioned above the paddle section 1162, and the column bottom 1172 is positioned below the paddle section 1162; the dispersion columns 117 have at least a cylindrical surface parallel to the central axis.
• the mixing device 100 further includes turbulence plates 115, which are used to block the circumferential flow of the slurry driven by the mixing tank 101 has a stirring paddle 113 located at its inner wall.
• turbulence plates 115 are arranged at different circumferential positions on the inner wall of the mixing tank, and the turbulence plates 115 extend axially. Part of the circumferentially rotating slurry contacts the turbulence plates 115 and climbs up under the turbulence plates 115's guidance, avoiding being rotated circumferentially only under the action of the dispersion disk 116 and dispersion columns 117, enhancing the vertical rolling of the slurry and improving the mixing effect.
• the turbulence plates 115 are fixed or rotatably mounted on the inner wall of the mixing tank.
• the rotatable setting allows adjusting the inclination angle of the turbulence plates 115, suitable for different dispersion rotation speeds.
• the projection of the bottom surface of the dispersion disk 116 on a plane perpendicular to the dispersion axis is a straight line segment, and the gap between the bottom surface of the dispersion disk 116 and the bottom surface of the inner tank 1012 forms a kneading zone.
• the mixture enters the kneading zone, due to the sudden reduction in space, the mixture is kneaded under the compression of the bottom surface of the dispersion disk 116 and the bottom surface of the inner tank 1012, improving the mixing effect.
• the forward guide surface 1163 and the reverse guide surface 1164 are connected by a connecting surface 1165, ensuring a certain spacing between the connection of the forward guide surface 1163 and the reverse guide surface 1164 to ensure the passage of the mixture in the guide channel 116a.
• a conical boss 1166 is formed at the center portion 1161, and the guide cone 118 is installed on the boss 1166.
• the boss 1166 forms a second drainage surface 1166a, the second drainage surface 1166a has the same cone angle as the first drainage surface, allowing the slurry to flow smoothly from the surface of the guide cone 118 to the dispersion disk 116.
• the second drainage surface intersects with the top surface of the dispersion disk 116 to form a diversion outer edge
• the connecting surface 1165 intersects with the top surface of the dispersion disk 116 to form a transition outer edge. At least part of the transition outer edge overlaps with the diversion outer edge. This allows the slurry flowing through the guide cone 118 to be directly diverted to the guide channel 116a, enhancing the flow effect.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Dispersion Chemistry (AREA)
• Mixers Of The Rotary Stirring Type (AREA)

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Citations (1)

• 2024
  • 2024-07-02 EP EP24185924.8A patent/EP4674518A1/de active Pending

Patent Citations (1)

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