Round flotation machine impeller stator assembly

Abstract

The invention discloses a circular flotation machine impeller stator assembly which comprises an impeller and a stator set and is characterized in that the stator set is connected with a flow guide plate and a stator support, and the flow guide plate is of an inverted conical annular structure and is formed by splicing two half flow guide plates; the impeller comprises a conical disc, the lower end of the conical disc is connected with evenly-distributed impeller blades, and a distributor is connected to a vent hole in the lower end of the conical disc and arranged in the impeller blades. The distributor comprises an upper straight cylinder part communicated with the vent hole and a lower spherical part, large exhaust holes are uniformly distributed in the circumference of the straight cylinder part, and small exhaust holes are uniformly distributed in the spherical part; the stator group consists of two half stators; the semi-stator comprises a semi-annular bottom plate, and the bottom plate is connected with blades which are evenly distributed. The flow guide plate can guide ore pulp to flow obliquely upwards, and the operation area is enlarged; the guide plates are fixedly connected with the stator blades, so that the structural strength is improved, toppling is effectively prevented, and the service life is prolonged; the dovetail joint connecting structure is easy to assemble and firm and reliable in connection.

Description

Technical Field

[0001] The present invention relates to an impeller - stator assembly of a circular flotation machine, belonging to the technical field of flotation machines. Background Art

[0002] Flotation machines are widely used in the separation processes of metal and non - metal minerals. Its core components are the impeller and the stator. Its main working principle is that the pulp added with reagents is introduced into air under the rotation of the impeller, and through the guiding action of the stator, the pulp, reagents and air are fully mixed, so that some mineral particles adhere to the surrounding of the bubbles, and then separation is carried out. As the core components of the flotation machine, the structural design and hydrodynamic characteristics of the impeller - stator directly determine the flotation efficiency, energy consumption level and the stability of equipment operation.

[0003] For the existing flotation machine stator, firstly, its blades are in a cantilever structure and there is no fixed structure at the upper part. Especially during the use of medium - large flotation machines, the blades of the stator are severely worn by the impact of the pulp and are prone to tipping, seriously affecting the flotation performance and service life. Secondly, the upper part of the stator is designed with an open mouth, which cannot achieve the guiding function, limits the role of the stator, and the flow field is disordered in the upper area of the stator, and the bubble distribution is uneven, affecting the mineralization effect.

[0004] In recent years, although there have been studies on improvements by optimizing the blade angle, adding auxiliary guiding structures or adjusting the stator opening ratio, etc., limited by the inherent defects of the traditional structure, it is still difficult to simultaneously meet the comprehensive requirements of high - efficiency mineralization, low energy consumption and long service life. For example, some improvement schemes increase the energy consumption significantly by increasing the number of impeller blades to improve the stirring intensity; while some designs using asymmetric stator structures can improve the flow field uniformity, but the processing is complex and the maintenance cost is high. Therefore, there is an urgent need for an impeller - stator assembly with innovative structure and better hydrodynamic characteristics to break through the bottleneck of the existing technology and meet the stringent requirements of modern flotation processes for high efficiency, energy conservation and reliability. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the above - mentioned existing technologies and provide an impeller - stator assembly of a circular flotation machine.

[0006] The technical solution provided by the present invention is as follows: An impeller - stator assembly of a circular flotation machine, which includes an impeller and a stator group. It is characterized in that the stator group is connected with a deflector and a stator support. The deflector is in an inverted conical - ring structure and is composed of two half - deflectors spliced together; the impeller includes a conical disk, the lower end of the conical disk is connected with evenly distributed impeller blades, a distributor is connected at the ventilation hole at the lower end of the conical disk, and the distributor is arranged inside the impeller blades; the distributor includes a straight - tube part at the upper part communicated with the ventilation hole and a spherical part at the lower part. Large exhaust holes are evenly distributed on the circumference of the straight - tube part, and small exhaust holes are evenly distributed on the spherical part; the stator group is composed of two half - stators; the half - stator includes a semi - circular - ring bottom plate, and blades are connected to the bottom plate in a uniform distribution.

[0007] Further, the included angle γ between the flow guide plate and the horizontal is 5° to 30°.

[0008] Further, the included angle α between the conical disk and the horizontal is 5° to 30°.

[0009] Further, the two ends of the semi-flow guide plate are respectively provided with a flow guide plate dovetail boss and a flow guide plate dovetail groove; the two semi-flow guide plates are connected through the flow guide plate dovetail boss and the flow guide plate dovetail groove to form an inverted conical ring-shaped flow guide plate.

[0010] Further, the two ends of the bottom plate are respectively provided with a stator dovetail boss and a stator dovetail groove, and the two semi-stators can be connected through the stator dovetail boss and the stator dovetail groove to form a circular stator group.

[0011] Further, the stator support includes an upper circular ring, a lower circular ring and vertical plates in the lower part. The stator group and the stator support are fixedly connected by bolts; the lower part of the upper circular ring is connected to the vertical plates, and the lower part of the vertical plates is connected to the lower circular ring.

[0012] Further, the vertical plates are evenly distributed in the circumferential direction, and the number is 4 to 16.

[0013] Further, steel skeletons are arranged inside the conical disk and the blades of the impeller, inside the semi-flow guide plate, and inside the bottom plate of the semi-stator and the blades.

[0014] Advantages of the present invention: In the present invention, the included angle α between the conical disc of the impeller and the horizontal is 5° to 30°, and the deflector is in an inverted conical ring structure with the included angle γ with the horizontal being 5° to 30°. The pulp can move obliquely upward under the action of the rotation of the impeller, expanding the flotation stirring and mixing area, prolonging the mixing time of minerals, bubbles and reagents, shortening the transportation area, reducing the probability of minerals attached to the bubbles falling off, and thus improving the flotation efficiency. The lower part of the distributor of the impeller in the present invention is spherical, which conforms to the flow field shape of the pulp inhaled by the lower part of the impeller and distributed along the periphery under the action of centrifugal force, reducing wear and increasing the service life. Large exhaust holes are uniformly distributed on the circumference of the straight cylinder part of the distributor. The large exhaust holes have a larger diameter, meeting the requirements of the air ventilation volume for flotation; small exhaust holes are uniformly distributed on the spherical part, and the small exhaust holes facilitate the dispersion of air to form fine bubbles. The stator support of the present invention has circular ring structures at the upper and lower parts, increasing the contact area with the upper and lower structures. The vertical plates are arranged in a circumferential radiation pattern, improving the structural strength, reducing the pulp-facing area, unblocking the pulp circulation channel, and improving the flotation efficiency and service life. The deflector of the present invention is composed of two half-deflectors spliced through a deflector dovetail boss and a deflector dovetail groove, and the stator group is connected by two half-stators through a stator dovetail boss and a stator dovetail groove, which is convenient for installation, removal and maintenance, has a high connection strength, and improves the overall stability. Steel skeletons are arranged inside the impeller, half-deflector and half-stator of the present invention, and wear-resistant materials such as rubber, polyurethane or ceramic are arranged on the surfaces, prolonging the service life of the components and improving the equipment operation rate. The present invention can give full play to the guiding role of the impeller and the stator, thereby improving the full mixing effect of the pulp, reagents and air, expanding the stirring and mixing area, improving the flotation effect, and significantly increasing the service life of the impeller and the stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the impeller of the present invention; Figure 3 is a schematic structural diagram of the conical disc of the present invention; Figure 4 is Figure 3 top view of; Figure 5 is a schematic structural diagram of the distributor of the present invention; Figure 6 is a schematic structural diagram of the deflector of the present invention; Figure 7 is is Figure 6 top view of; Figure 8 is a schematic structural diagram of the half-deflector of the present invention; Figure 9 is a schematic structural diagram of the stator group of the present invention; Figure 10 is a schematic structural diagram of the half-stator of the present invention; Figure 11 This is a schematic structural view of the stator bracket of the present invention.

[0016] In the figure: 1. Impeller, 11. Cone disc, 111. Bolt hole, 112. Vent hole, 12. Impeller blade, 13. Distributor, 131. Large exhaust hole, 132. Small exhaust hole, 133. Straight tube part, 134. Spherical part, 2. Deflector, 21. Half deflector, 211. Bolt counterbore, 212. Deflector dovetail boss, 213. Deflector dovetail groove, 3. Sealing plug, 4. Stator group, 41. Half stator, 411. Threaded hole, 412. Blade, 413. Bottom plate, 414. Bolt hole, 415. Stator dovetail boss, 416. Stator dovetail groove, 5. Stator bracket, 51. Upper ring, 52. First bolt hole, 53. Vertical plate, 54. Lower ring, 55. Second bolt hole. Specific embodiments

[0017] The following will make a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings: As Figure 1 shown, a circular flotation machine impeller stator assembly includes an impeller 1, a deflector 2, a sealing plug 3, a stator group 4 and a stator bracket 5. The impeller 1 can rotate under the drive of power, and the deflector 2 and the stator group 4 are fixedly connected by bolts. The stator group 4 and the stator bracket 5 are fixedly connected by bolts.

[0018] As Figure 2 , Figure 3 , Figure 4 shown, the impeller 1 is composed of a cone disc 11, impeller blades 12 and a distributor 13; the lower end of the cone disc 11 is connected to the uniformly distributed impeller blades 12, and the included angle between the cone disc 11 and the horizontal is α, and the range of α is 5° to 30°. A vent hole 112 is provided in the middle of the cone disc 11, and threaded holes 111 are arranged in a circle. The pulp can move obliquely upward under the rotation of the impeller, expanding the flotation stirring and mixing area, prolonging the mixing time of minerals, bubbles and reagents, and improving the flotation efficiency. The distributor 13 is connected to the vent hole 112 at the lower end of the cone disc 11, and the distributor 13 is arranged inside the impeller blades 12.

[0019] As Figure 5 shown, the distributor 13 is composed of a straight tube part 133 at the upper part communicated with the vent hole 112 and a spherical part 134 at the lower part connected thereto, and the radius R of the spherical part 134 ranges from 50 mm to 500 mm. Large exhaust holes 131 are uniformly distributed on the circumference of the straight tube part 133, and small exhaust holes 132 are uniformly distributed on the spherical part 134. The lower part of the distributor is spherical, which conforms to the flow field shape of the pulp inhaled at the lower part of the impeller and discharged along the periphery under the action of centrifugal force, reducing wear and improving the service life.

[0020] As Figure 6 ,Figure 7 As shown in the figure, the deflector 2 is formed by splicing two semi-deflectors 21. The deflector 2 has an inverted conical ring structure, with an included angle γ with the horizontal, and the range of γ is 5° to 30°. This enables the pulp discharged from the impeller 1 to move obliquely upward along the included angle γ, increasing the stirring area, shortening the transportation area, reducing the shedding rate of minerals attached to the bubbles, and improving the flotation efficiency.

[0021] As Figure 8 shown in the figure, bolt counterbores 211 for connecting the stator group are provided on the semi-deflector 21, and the bolt counterbores 211 are evenly distributed in a circle. The semi-deflector 21 is connected and fixed to the stator group 4 through the bolt counterbores 211 and bolts. A sealing plug 3 is arranged in the bolt counterbores 211, and the material of the sealing plug 3 is rubber or polyurethane, which is used to protect the connecting bolts between the deflector 2 and the stator group 4. Deflector dovetail bosses 212 and deflector dovetail grooves 213 are respectively arranged at both ends of the semi-deflector 21. The two semi-deflectors 21 can be connected through the deflector dovetail bosses 212 and deflector dovetail grooves 213 to form an inverted conical ring deflector 2, which is convenient for installation, removal and maintenance, has high connection strength, and improves the overall stability.

[0022] As Figure 9 、 Figure 10 shown in the figure, the stator group 4 is composed of two semi-stators 41. The semi-stator 41 includes a semi-circular ring bottom plate 413, and evenly distributed blades 412 are connected to the bottom plate 413. Threaded holes 411 are arranged at the upper ends of the blades 412, and the positions of the threaded holes 411 correspond to the bolt counterbores 211 of the semi-deflector 21, which are used to connect the semi-stator 41 and the semi-deflector 21 with bolts. Bolt holes 414 are arranged on the bottom plate 413, which are used to connect and fix the stator group 4 to the stator support 5 with bolts. Stator dovetail bosses 415 and stator dovetail grooves 416 are respectively arranged at both ends of the bottom plate 413. The two semi-stators 41 can be connected through the stator dovetail bosses 415 and stator dovetail grooves 416 to form a circular stator group 4, which is convenient for installation, removal and maintenance, has high connection strength, and improves the overall stability.

[0023] As Figure 11 shown in the figure, the stator support 5 includes an upper circular ring 51, a lower circular ring 54, and vertical plates 53. The upper circular ring 51 is provided with first bolt holes 52, and the positions correspond to the bolt holes 414 on the stator group 4. Bolts are used to connect the stator group 4 and the stator support 5. The lower part of the upper circular ring 51 is connected to the vertical plates 53, and the vertical plates 53 are used to support the upper circular ring 51, the stator group 4 and the deflector 2. The lower part of the vertical plates 53 is connected to the lower circular ring 54, and the lower circular ring 54 is provided with second bolt holes 55, which are used to fix the stator support 5 with bolts. The vertical plates 53 are evenly distributed in a circle, and the number is 4 to 16. The upper and lower parts of the stator support 5 are circular ring structures, increasing the contact area with the upper and lower structures. The vertical plates are arranged in a circumferential radiation pattern, improving the structural strength, reducing the slurry-facing area, unblocking the slurry circulation channel, and improving the flotation efficiency and service life.

[0024] As Figure 2 , Figure 8 and Figure 10 shown, steel skeletons are provided inside the conical disc 11 of the impeller 1 and the blades 12, and inside the bottom plate 413 of the semi-guide plate 21 and the semi-stator 41 and the blades 41. Wear-resistant materials such as rubber, polyurethane or ceramics are provided on the surfaces, extending the service life of the components and improving the operation rate of the equipment.

[0025] During the working process, the impeller 1 is connected to an external driving device through the bolt holes 111. The external driving device drives the impeller 1 to rotate. Under the action of centrifugal force, the pulp and the reagent are sucked in from the bottom of the impeller and discharged along the conical disc 11 from the middle and upper parts, and an obliquely upward radial turbulent flow is formed under the action of the guide plate 2 and the blade 412. As the pulp is discharged, a negative pressure is formed in the middle and upper parts of the impeller 1. Air enters the distributor 13 through the vent holes 112, enters the pulp through the large exhaust holes 131 and the small exhaust holes 132, and is broken into bubbles under the rotation of the impeller 1. The mineral particles, reagents and bubbles in the pulp are fully mixed. Under the action of the reagent, some mineral particles float up with the bubbles. Another part of the mineral particles and the reagent, under the rotation of the impeller 1, are re-sucked in from the bottom of the impeller 1 through the space between the vertical plates 53 of the stator support 5, and are mixed with the bubbles to form a radial turbulent flow, thus forming a cycle at the bottom.

[0026] It should be understood that the parts not elaborated in detail in this specification all belong to the prior art. The above embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A circular flotation machine impeller stator assembly, which comprises an impeller and a stator group, and is characterized in that, The stator group is connected to the flow guide plate and the stator support. The flow guide plate has an inverted conical annular structure and is formed by splicing two half flow guide plates; the impeller includes a conical disk, the lower end of the conical disk is connected to evenly distributed impeller blades, and a distributor is connected at the ventilation hole at the lower end of the conical disk. The distributor is arranged inside the impeller blades; the distributor includes a straight cylinder part at the upper part communicated with the ventilation hole and a spherical part at the lower part. Large exhaust holes are evenly distributed on the circumference of the straight cylinder part, and small exhaust holes are evenly distributed on the spherical part; the stator group is composed of two half stators; the half stator includes a semi-circular ring bottom plate, and blades are connected to the bottom plate evenly.

2. The circular flotation machine impeller stator assembly according to claim 1, wherein The included angle γ between the flow guide plate and the horizontal plane is 5° to 30°.

3. A circular flotation machine impeller stator assembly according to claim 1, wherein The included angle α between the conical disk and the horizontal plane is 5° to 30°.

4. The circular flotation machine impeller stator assembly according to claim 1, characterized in that The two ends of the half flow guide plate are respectively provided with a flow guide plate dovetail convex platform and a flow guide plate dovetail groove; the two half flow guide plates are connected through the flow guide plate dovetail convex platform and the flow guide plate dovetail groove to form an inverted conical annular flow guide plate.

5. The impeller stator assembly of a circular flotation machine according to claim 1, characterized in that The two ends of the bottom plate are respectively provided with a stator dovetail convex platform and a stator dovetail groove, and the two half stators can be connected through the stator dovetail convex platform and the stator dovetail groove to form a circular stator group.

6. A circular flotation machine impeller stator assembly according to claim 1, characterized in that The stator support includes an upper circular ring, a lower circular ring and a vertical plate at the lower part. The stator group and the stator support are fixedly connected by bolts; the lower part of the upper circular ring is connected to the vertical plate, and the lower part of the vertical plate is connected to the lower circular ring.

7. The impeller stator assembly of a circular flotation machine according to claim 6, characterized in that The vertical plates are evenly distributed in the circumference, and the number is 4 to 16.

8. The impeller stator assembly of a circular flotation machine according to claim 1, wherein Steel skeletons are arranged inside the conical disk and the blades of the impeller, inside the half flow guide plate, and inside the bottom plate and the blades of the half stator.

Images