SU1055542A1 - Impeller unit of flotation machine - Google Patents

Abstract

1. IMMILLER TREE OF A FLOTATION MACHINE, including a housing with bearings, a shaft with a drive, an impeller made of a disk with working blades radially mounted on it, a central tube with circulation windows, a stator with a central window in its nadymlelerny disk, o. It is distinguished by the fact that, in order to reduce the energy consumption for mixing and aerating the pulp and increasing the service life of the impeller unit by increasing the length of the air ejection front and eliminating the ballast flow circulation of the pulp in the impeller space, the impeller unit (L deflector blades mi made curved shape and installed on the impeller disk between the blades with a gap).

Description

2. Impeller unit according to claim 1, about t - 3.

This is because the deflecting blades are made in length with constant thickness. losss ta

The reasons are that the deflecting blades are made along the Length with variable thickness. Impeller unit on Po1, o t

This invention relates to the enrichment of minerals by flotation, in particular, to designs of flotation machines. The design of the impeller unit of the flotation machine is known, comprising a bearing housing, a shaft with a drive and an impeller from a disk and radial blades, a central tube and a stator. The combination of the impeller and the stator in this block provides sufficient mixing and aeration of the D1. However, this device is characterized by high power consumption and rapid wear of the impeller and stator4. The closest to the invention is in its technical essence and. The achieved result is an impeller block of a flotation array / iny, including a housing with bearings, a shaft with a drive, an impeller made of a disk with a radially mounted radius on it. With barrel blades, a central tube with circulation windows, a stator with a central window in its nampeller disk f. The disadvantages of the known impeller unit are increased electric power consumption; mixing and aeration of the pulp and rapid wear of the impeller and stator. This is due to the fact that when the impeller rotates, the return flow of the pulp entering the interscapular spaces affects the ends of the impeller blades, In some cases, part of the reverse pulp flow, including reflected from the ends of the blades as a result of the impact, penetrates deep into the interscapular space impeller, which reduces the length of the ejection front of air and the radius of motion of this front, and at the same time causes an increase in the overhead cost of electric energy for centrifugal acceleration of the pulley entering | В olost impeller. In order to restore the previous length, the ejection front of air and the previous radius of motion, in this case, a noticeable increase in the impeller speed is required. increase energy costs. The displacement of the ejection front within the impeller disk indicates that the lower pulp flow penetrates deep enough into the interscapular space, and most of the energy is consumed for pumping, i.e. This energy is used to overcome the ballast circulation of the lower pulp flow in the interscapular space. The amount of intake air at the same time remains relatively low due to the entrance of the ejection front within the impeller circumference. The purpose of the invention is to reduce the energy consumption for mixing and aerating the pulp and increasing the service life of the impeller unit by increasing the length of the air ejection front and eliminating the ballast circulation of the pulp flow in the interspace of the impeller. This goal is achieved by the fact that the impeller unit of a flotation machine, including a housing with bearings, a shaft with a drive, an impeller made of a disc with radially mounted blades on it, a central tube with circulation windows, a stator with a central window in its nadepeller disc, deflector blades made of a curvilinear shape and mounted on the impeller disk between the blades with gaps. In this case, the deflecting blades are made in length with a constant or variable thickness. Figure 1 shows the impeller unit of the flotation machine, general view; in fig. 2-5 interscapular impeller space, top view. In the chamber 1 of the flotation machine, an impeller unit is installed, including a housing with bearings 2, VAYA 3 with a drive, a stator 5 with a central window 6 in its nadymlelerny disk and a central pipe 7 with circulation windows 8. On the shaft 3 there is an impeller E, from the disk 10, working blades 11 installed radially on the disk 10, and deflecting blades 12 installed on the disk 40 in each interscapular space with a gap for the passage of air S and with a gap for the passage of the pulp S, Deflecting blades 12 are made curvilinear or like an hour This case is curvilinear, rectangular in shape, and has a constant or variable thickness in length. In Figures 2 through 5, the possible limiting installation positions of the deflecting blades 12 are shown by dashed lines, and the shaded fields show the maximum possible thickening of the deflecting blades 12 along the length. The impeller unit works as follows. When the impeller 9 rotates, the pulp from the chamber 1 through the circulation windows 8 of the central tube 7 and then through the central window b of the disk of the stator 5 enters the central part of the impeller 9 and is scattered into its interstitial spaces. In the inter-blade space, under the action of tangential forces, this central pulp flow is pressed against the front side of the impeller during rotation of the working blade 11 and flows down to its peripheral end at an increasing speed under the action of centrifugal forces into the gap S. the end of the working blade 11 reaches smaller sizes than the size of the gap S, therefore this flow freely passes through the gap S and, meeting with the surface of the reverse flow of the pulp, dislodged from the working surface deflecting danger 12, ejects air entering together with the central flow of pulp through the gap 5. Behind the back side of the peripheral, end of the working blade 11, as a result of the last central flow of the pulp disrupting, an underpressure is generated which facilitates the flow of air into this area through the gap S and somewhat increases the reverse flow of the pulp into the next interscapular space. On the way of movement, this reverse flow of pulp meets at an acute angle (without impact) with the working surface of the deflecting blade 12 and ejects air entering through the gap S. Further, the indicated work cycle is repeated, i.e. In each interscapular space of the impeller, backflow of pulp air is ejected at two sites along an almost doubled front of movement under conditions of unaccented interaction with elements of the impeller and reduction of unproductive pulp circulation in the interscapular space of the impeller. When a deflector blade is installed, circulation of the bottom stream is completely prevented or becomes insignificant, into the interscapular space of the impeller due to unaccented interaction with the deflector blade. 8 of these conditions, the front of the air ejection line meets free surfaces of radial and tangential flows. completely removed beyond the impeller diameter, i.e. the length of the ejection front and the radius of its movement increase, which automatically leads to a decrease in energy consumption for mixing and aeration of the pulp. The presence of an air gap ALYA and the fact that the deviating hole is located outside the center-window window of the impeller disk and therefore does not capture the pulp, create conditions for the free passage of air along the working blade to the line where the lower pulp flow meets the surface. deviating blades, where additional air ejection occurs at the additional length of the ejection front. The absence of the impact effect of the lower flow on the working blades and the decrease in the total pulp circulation volume between the impeller and the stator significantly reduce the wear of these parts of the impeller unit. The limit of the gap 5 is set, calculated on the basis of determining the minimum value of the horizontal size of the pulp jet before leaving the impeller, at which the discontinuity of this jet appears outside the impeller. The size of the gap S is determined constructively, starting from. specific conditions for the arrangement and shape of the blades, as well as taking into account the part of the pulp flow flowing through the gap between the nampeller disk and the blade. Depending on the shape and location of the deflecting blade, the intensity of mixing and aeration of the pulp changes with a natural increase in energy loss with an increase in the intensity of mixing of the pulp. For example, when deviating blades are positioned as shown by solid lines in FIG. 2 - k, the intensity of the pulp mixing is minimal, and as these blades approach the positions indicated by the dashed lines, the intensity of the pulp mixing increases faster than her aeration. With the arrangement of the deflecting blades, as shown by the solid lines in FIG. 2, on their rear sides

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FIG. There is a possibility of centrifugal sedimentation of solids of the pulp, flowing through the gap between the nampeller disc and the upper edge of the blade, which can cause unbalance of the impeller and its vibration, leading to disruption of pulp aeration. Making the blade thickness as shown by the shaded field prevents the sedimentation of solid particles of pulp on the back side of the lobes, and provides for lower power consumption for mixing and aeration of the pulp. Thus, the proposed impeller unit of the flotation machine has a reduced consumption of electricity for mixing and pulp aeration and an increased service life of the impeller and stator by increasing the length of the air ejection front and eliminating the ballast circulation of the pulp flow in the inter-blade area of the impeller.

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Claims (3)

1. IMMELLER BLOCK OF A FLOTATION MACHINE, including a housing with bearings, a shaft with a drive, an impeller made of a disk with working blades radially mounted on it, a central pipe with circulation windows, a stator with a central window in its nadympeller disk, characterized in that, with the purpose of reducing the energy consumption for mixing and aeration of the pulp and increasing the service life of the impeller unit by increasing the length of the front of the ejection air and eliminating the ballast circulation of the pulp stream in the interscapular space ve impeller, impeller blades deflection unit is provided, made of curved shape and the impeller mounted on the drive between the rotor blades with gaps. SU <„1055542 2. The impeller unit according to claim 1, characterized in that the deflecting blades are made in length with a constant thickness. 3. The impeller unit according to claim 1, characterized in that the deflecting blades are made according to the Length with a variable thickness.