Mechanical stirring type impeller for coal flotation machine
By optimizing the impeller design and adopting continuous curvature arc-shaped blades and streamlined guide nuts, the problem of insufficient air intake of traditional impellers has been solved, achieving more efficient mixing of slurry and air, and improving the aeration performance and process effect of the flotation machine.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA COAL TIANJIN DESIGN ENG CO LTD
- Filing Date
- 2025-07-02
- Publication Date
- 2026-06-16
AI Technical Summary
Traditional mechanical agitation flotation machines suffer from problems such as unstable air intake and low aeration efficiency in their impeller design, especially insufficient negative pressure at the center of the upper and lower blades, which affects the flotation process.
The design employs continuous curvature arc-shaped blades and streamlined guide nuts to optimize blade morphology, thereby improving air intake performance and ensuring uniform mixing of slurry and air.
It significantly improves the impeller's air intake performance, stabilizes the flotation process effect, and increases the aeration efficiency of the flotation machine.
Smart Images
Figure CN224358608U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal processing and utilization technology, specifically to an impeller for a mechanically stirred flotation machine used in coal preparation. Background Technology
[0002] Foam flotation is a key process in the flotation of fine-particle coal slime, with mechanically agitated flotation machines relying on impellers to achieve pulp aeration, circulation, and mixing. Traditional mechanically agitated flotation machines employ a double-layer umbrella-shaped impeller structure: the upper blades and stator cover plate form a circulating pulp channel, aerating the pulp through a sleeve frame; the lower blades draw in fresh pulp from the suction port and aerate it through the arcuate groove on the hub. However, due to the influence of impeller speed, pulp flow velocity, and fluid turbulence, the negative pressure formed at the center of the upper and lower blades is often insufficient, resulting in unstable air intake, low aeration efficiency, and hindering the flotation process effect.
[0003] Existing improvements, such as patent CN 212633042 U, employ straight, knife-handle-shaped blades for the upper layer, which have limitations. During high-speed rotation, they are prone to generating localized vortex backflow, hindering uniform airflow diffusion. Furthermore, the nut structure located at the center of the lower blades does not conform to fluid dynamics design, failing to effectively guide the slurry and generating localized positive pressure below the hub and at the root of the lower blades, limiting the air intake strength and stability of the lower blades. Therefore, how to further optimize the blade morphology and design a nut with slurry guiding function that conforms to fluid dynamics design to improve the air intake performance of the flotation machine impeller and stabilize the flotation process is a pressing technical challenge in the field of coal slime flotation. Utility Model Content
[0004] The purpose of this utility model is to provide a mechanically agitated flotation machine impeller for coal preparation, which has the function of guiding slurry and conforms to fluid dynamics design, so as to improve the air intake performance of the flotation machine impeller and stabilize the flotation process effect.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] The impeller of a mechanically agitated flotation machine for coal preparation includes a hub, a main shaft, an upper conical ring, a lower conical ring, and a guide nut. The upper conical ring is connected to the hub, and the hub is detachably connected to the main shaft. The main shaft passes through the hub and is connected to the guide nut on the other side. The guide nut is a combined rotating structure. Upper blades are vertically connected to the surface of the upper conical ring. Lower blades are vertically connected between the upper and lower conical rings. The upper and lower blades are a ring array structure composed of integral, continuous curvature arc-shaped blades. The hub has a radially penetrating arc groove, and the lower conical ring has a suction port connected to the arc groove at its center. The angle between the tangent of the arc-shaped blade away from the center end of the upper blade and the tangent of the ring of the upper conical ring is 110° to 135°, and the cone angle of the lower conical ring is 140° to 160°.
[0007] In the impeller of the above-mentioned mechanically agitated flotation machine for coal preparation, the radius of curvature of each continuous curved arc blade in the upper layer is 0.7 to 1.5 times the diameter of the upper conical ring.
[0008] In the impeller of the above-mentioned mechanically agitated flotation machine for coal preparation, the cone angle of the upper cone ring is 60° to 120°.
[0009] In the impeller of the above-mentioned mechanically agitated flotation machine for coal preparation, the guide nut is a combined rotating body structure. The generatrix of the guide nut is connected in sequence to a horizontal line segment, a first vertical line segment, an oblique line segment, a second vertical line segment, an arc segment, and a spherical segment. The cone angle of the rotating body formed by the oblique line segment is the same as the cone angle of the upper cone ring. The tangent of the arc segment away from the center end is parallel to the oblique line segment.
[0010] In the impeller of the above-mentioned mechanical agitation flotation machine for coal preparation, the guide nut is threadedly connected to the main shaft; the guide nut is provided with a threaded hole in the axial direction, and the end of the main shaft is provided with a thread that matches the threaded hole.
[0011] The beneficial effects of this utility model are:
[0012] This invention optimizes the traditional straight, handle-shaped blades used in the upper layer of the flotation machine by replacing them with continuously curved, arc-shaped blades. This significantly reduces fluid pumping resistance and enhances the blades' ability to guide airflow. The arc-shaped blades create a continuous and smooth negative pressure gradient during rotation, forcing the slurry away efficiently from the hub's ventilation holes. This creates a more stable and stronger negative pressure zone at the center of the hub, significantly increasing the impeller's air intake and solving the problem of insufficient air intake capacity in the upper layer of conventional mechanically agitated coal flotation machines.
[0013] This invention utilizes a streamlined guide nut design. When the lower blades draw in fresh slurry from the suction port, the slurry does not directly act on the vicinity of the hub to create localized positive pressure. Instead, it disperses to the periphery under the action of the arc segment of the guide nut. Air is jetted through the arc groove on the hub to the inclined segment of the guide nut, where it disperses to the periphery under the action of the inclined segment. The air and slurry are fully mixed at the lower blades, thus solving the problem of insufficient air volume in the lower blades. Attached Figure Description
[0014] Figure 1 This is a cross-sectional view of the overall structure of this utility model;
[0015] Figure 2 This is a three-dimensional structural diagram of the present invention;
[0016] Figure 3 This is a top view of the structure of this utility model;
[0017] Figure 4 This is a top view of the lower blade structure of this utility model;
[0018] Figure 5 This is a schematic diagram of the structure of the flow guide nut of this utility model;
[0019] In the diagram: 1—hub; 2—main shaft; 3—arc groove; 4—upper conical ring; 401—circular tangent; 5—lower conical ring; 6—upper blade; 601—blade tangent; 7—lower blade; 8—guide nut; 801—threaded hole; 802—first vertical segment; 803—oblique segment; 804—second vertical segment; 805—arc segment; 806—spherical segment; 807—arc tangent; 808—horizontal segment; 9—slurry suction port. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this utility model.
[0021] refer to Figures 1 to 5 This utility model relates to an impeller for a mechanically stirred flotation machine used in coal preparation, including a hub 1 mounted on a main shaft 2, an upper conical ring 4, a lower conical ring 5, and a flow guide nut 8. The upper conical ring 4 is provided with upper blades 6, which are continuous curvature arc-shaped blades. The space between the upper conical ring 4 and the lower conical ring 5 is provided with lower blades 7. The lower conical ring 5 is provided with a slurry suction port 9 at its center. The hub 1 is provided with an arc groove 3.
[0022] The radius of curvature of the upper blade 6 is 0.7 to 1.5 times the diameter of the upper conical ring 4. The angle between the blade tangent 601 of the upper blade 6 away from the center end and the annular tangent 401 of the upper conical ring 4 is 110° to 135°. The cone angle of the upper conical ring 4 is 60° to 120°, and the cone angle of the lower conical ring 5 is 140° to 160°.
[0023] The flow guide nut 8 is a combined rotating body. The generatrix of the combined rotating body is sequentially connected to a horizontal segment 808, a first vertical segment 802, a diagonal segment 803, a second vertical segment 804, an arc segment 805, and a spherical segment 806. The cone angle of the rotating body formed by the diagonal segment 803 is the same as the cone angle of the upper conical ring 4. The tangent 807 of the arc segment 805 away from the center is parallel to the diagonal segment 803. The flow guide nut 8 has a threaded hole 801 at its center, and the end of the main shaft 2 has a thread that mates with the threaded hole 801.
[0024] The impeller is driven to rotate by the main shaft 2. The upper conical ring 4 and the stator cover plate (not shown in the figure) form a closed cavity. The upper blades 6, which have a continuous curvature arc shape and are installed on the upper conical ring 4, rotate at high speed. Their continuous curvature design significantly reduces fluid resistance. After the upper blades 6 evenly throw out the slurry, a continuous and smooth negative pressure gradient zone is formed. Under the action of negative pressure, external air is efficiently sucked in through the sleeve frame (not shown in the figure) and cut into microbubbles by the upper blades 6. Fresh slurry is continuously sucked upward through the suction port 9 and dispersed to the periphery under the action of the arc section 805 of the guide nut. Air is jetted through the arc groove 3 on the hub to the inclined section 803 of the guide nut and dispersed to the periphery under the action of the inclined section 803 of the guide nut. The air and slurry are fully mixed at the lower blades and discharged from the impeller, thereby improving the aeration performance of the flotation machine and improving the flotation process effect.
[0025] This invention optimizes the traditional straight, handle-shaped blades used in the upper layer of the flotation machine by replacing them with continuously curved, arc-shaped blades. This significantly reduces fluid pumping resistance and enhances the blades' ability to guide airflow. The arc-shaped blades create a continuous and smooth negative pressure gradient during rotation, forcing the slurry away efficiently from the hub's ventilation holes. This creates a more stable and stronger negative pressure zone at the center of the hub, significantly increasing the impeller's air intake and solving the problem of insufficient air intake capacity in the upper layer of conventional mechanically agitated coal flotation machines.
[0026] This invention utilizes a streamlined guide nut design. When the lower blades draw in fresh slurry from the suction port, the slurry does not directly act on the hub and the vicinity of the lower blade root to create localized positive pressure. Instead, it disperses to the periphery under the action of the arc segment of the guide nut. Air is jetted through the arc groove on the hub to the inclined segment of the guide nut, and disperses to the periphery under the action of the inclined segment of the guide nut. The air and slurry are fully mixed at the lower blades, solving the problem of insufficient air volume in the lower blades.
[0027] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A mechanical agitator type coal flotation machine impeller characterized in that, It includes a hub (1), a main shaft (2), an upper conical ring (4), a lower conical ring (5), and a flow guide nut (8); the upper conical ring (4) is connected to the hub (1), the hub (1) is detachably connected to the main shaft (2), the main shaft (2) passes through the hub (1) and is connected to the flow guide nut (8) on the other side, the flow guide nut (8) is a combined rotating body structure; the upper conical ring (4) is vertically connected to an upper blade (6); the upper conical ring (4) and the lower conical ring (5) are vertically connected to a lower blade. (7); The upper blade (6) and the lower blade (7) are an annular array structure composed of integral continuous curvature arc-shaped blades; The hub (1) is radially provided with an arc groove (3), and the lower conical ring (5) is provided with a suction port (9) that connects to the arc groove (3) at its center; The angle between the tangent of the arc-shaped blade of the upper blade (6) away from the center end and the tangent of the annular line of the upper conical ring (4) is 110°~135°, and the cone angle of the lower conical ring (5) is 140°~160°.
2. The mechanical agitated floatation cell impeller for coal preparation according to claim 1, characterized in that, The radius of curvature of each continuous curvature arc-shaped blade in the upper layer (6) is 0.7 to 1.5 times the diameter of the upper conical ring (4).
3. The mechanical agitated floatation cell impeller for coal preparation according to claim 1, characterized in that, The cone angle of the upper cone ring (4) is 60° to 120°.
4. The impeller of the mechanically agitated flotation machine for coal preparation according to claim 1, characterized in that, The flow guide nut (8) is a combined rotating body structure. The generatrix of the flow guide nut (8) is connected in sequence with a horizontal line segment (808), a first vertical line segment (802), an oblique line segment (803), a second vertical line segment (804), an arc line segment (805), and a spherical segment (806). The cone angle of the rotating body formed by the oblique line segment (803) is the same as the cone angle of the upper cone ring (4). The tangent of the arc line segment (805) away from the center end is parallel to the oblique line segment (803).
5. The impeller of the mechanically agitated flotation machine for coal preparation according to claim 1, characterized in that, The guide nut (8) is threadedly connected to the main shaft (2); the guide nut (8) is provided with a threaded hole (801) in the axial direction, and the end of the main shaft (2) is provided with a thread that matches the threaded hole (801).