RU1835320C - Powder feeder - Google Patents

Abstract

Usage: the invention relates to devices for supplying powder materials from a fluidized bed and can be used to separate and supply fine powder to a sprayer. SUMMARY OF THE INVENTION: The cap-trap is perforated and provided with an additional perforated wall. The filter is fixed between the trap cap and the ejector. The space above the filter is connected to the exhaust ventilation system. In addition, the holes of the walls of the hoods-traps are offset from each other and are made decreasing to the top. 1 s.p., f-ly, 2 ill.

Description

The invention relates to devices for feeding, dispensing and transporting bulk materials, mainly powder, from a fluidized bed to nebulizers used in manual or automatic powder coating plants.

The purpose of the invention is the separation and supply of fine particles to the atomizer.

In the feeder made in this way, the cap-trap is a separator of fine powder fraction, which is uniformly pulled up by the exhaust fan, while some of the air is blown out through the displaced openings of the two cap walls, and the rest of the air suspension enters the ejector and is directed to the sprayer.

Figure 1 shows a pneumatic feeder, General view; figure 2 is a section aa in figure 1.

The feeder contains a bath 1, in which a porous partition 2 is mounted at an angle of 10-12 °. The space of the bath located under the porous partition 2 is connected by a pipe 3 to a source of compressed air. Bath 1 is connected to the pneumatic conveying system by a nozzle 4 equipped with a filter 5, and with a powder material collection system - by an exhaust nozzle 6. On the upper wall of the bath 1 there is a hatch 7 and a safety valve 8 .. Chambers 9 of the bulk layer adjacent to the side wall of the bath 1 and the vertical slots 10 communicating with it, made in the wall of the bath, are provided with vertically movable shutters 11. The bottom of the chambers 9 is located below the porous partition 2. In the bottom part of the chambers 9 there are metering ejectors 12 connected to transel receiving chambers

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porting ejectors 13 connected to nebulizers. The dampers 11 are fixed in position with screws 14. Drain pipes with ejectors (not shown) are located below the level of powder extraction. Perforated cap-traps 15 are installed in the upper part of the bath 1 above the porous partition 2. Ejectors 16 are located above the trap caps 15. The suction chambers of the ejectors 16 are connected through an opening with a space bounded by the trap caps 15 and the porous partition 2. Above the trap caps 15 and below the ejectors 16 there is a filter 17 mounted on suspensions and hermetically connected by flange connections to the walls of the bath 1 and the bodies of the ejectors 16. The perforated hoods-traps 15 are made with double walls 18 19, the holes are displaced relative to each other. The area of the openings decreases toward the top of the trap caps. At the top of the bath are compressed air nozzles 20 for cleaning the filter 17.

The device operates as follows. Compressed air flows through the nozzle 3 into the bath 1, passes through the porous baffle 2 and brings the powder material above it into a fluidized state. Through the slots 10, the powder enters the chambers 9 of the bulk layer, from which the metering ejectors 12 are fed to the transporting ejectors

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13 and further to the atomizer m. The powder rising above the fluidized bed under the influence of air taken from the bath through the exhaust pipe 6 is guided by perforated hoods-traps 15 to the inlet nozzles of the ejectors 16 and is fed to the atomizer m. Part of the powder settles on the walls 18 and 19 cap-traps and either slides into the bath under

Claims (2)

by force of gravity, or is discharged from the walls by forced cleaning of the filter 17 with compressed air from the nozzles 20. The claims 1. A powder feeder containing a fluidization chamber with a porous partition, a cap-trap and an ejector and a filter placed above the cap-trap, while the chamber the suction of the ejector is connected through an opening with a space bounded by a trap cap and a porous septum, characterized in that, in order to separate and supply fine powder to the atomizer, the trap cap perforated and equipped with an additional perforated wall, the filter is fixed between the cap-trap and the ejector, and the space above the filter is connected to the exhaust ventilation system .. 2. The feeder according to claim 1, characterized in that the openings of the walls of the cap-traps are offset to each other and are made to decrease upward. Figure 1 Figure 1