Патент USA US2404884код для вставки
July 30, 1946. “ o. T. PIEPER 2,404,334 APPARATUS FOR HANDLING POWDERED MATERIALS Filed March 12, 1945 BY ATTORNEYS Patented July 30, 1946 2,404,884 5 “ ‘ UNITED - STATES ‘ MATERIALS Oliver T; Pieper; Wilmington; Deli, assignor (for American Dyewoo'd‘ Company, New'Y'orkglN'. Y"; incorporation of Pennsylvania " , ApplicationMarch. 12, 1945',‘ Serial;‘No.,‘5S2,2‘_44' , 2 Claims. (Cl; NSF-215E) " 1 2 This invention relates to apparatus for remov ing powdered materials from vessels under par tial vacuum and particularly to improvements which ensure the proper functioning of such ap shaft l2 at one end of the housing 9 to prevent paratus. . _ leakage of air into the housing. The diameter of the helical conveyor l3 should be sufiiciently large to prevent arching of the powdered material ?owing into the housing 9. The diameter will vary, depending upon the characteristics of the particular material handled. The pitch of the helical conveyor I3 should be to handle because of inherent characteristics of such that its capacity is slightly less than that such materials. Special problems are presented when such materials are discharged from vessels 10 of the helical conveyor M in the extension l0. As the material is moved forwardly by the helical under partial vacuum such as dust separators conveyor l3, it is delivered to the conveyor H, wherein the materials are recovered from suspen the diameter of which is sufficiently smaller than. sion in gases. In such cases, the partial vacuum Powdered materials of various kinds employed ' in industrial operations are notoriously dii?cultl produces a reverse current of air through the dis the diameter of the conveyor l3 so as to cause formation of a plug of the powdered material‘in charge mechanism which prevents the powdered the open end 16 of the extension ID. This plug material from entering and traveling in the direc will be suf?ciently dense so that air will not pass tion of discharge. in the reverse direction even though the pow It is the object of the present invention to pro dered material is fed from the chamber 5 under 'vide a simple and effective apparatus capable of ensuring the desired delivery of the powdered 20 less than atmospheric pressure. The plug will advance continuously and will ‘be delivered material uniformly and without the usual dif ?culty from a vessel operating at a pressure below atmospheric. . Other objects and advantages of the inven tion will be apparent as it is better understood by ~' reference to thefollowing speci?cation and the accompanying drawing, in which Fig. l is a longitudinal section through an ap paratus embodying the invention; Fig. 2 is a plan view of the apparatus; and Fig. 3 is an end elevation thereof. Referring to the drawing, 5 indicates the lower or discharge portion of a chamber in which pow dered material is handled, as for example a dust separator of the cyclone type which is usually operated at a minus pressure. While the inven tion is particularly designed to operate in con nection with a dust separator, it may be utilized to discharge powdered material from any type of container. . An inlet 6 is connected to the chamber 5 by ?anges 1 and ‘8 or other suitable arrangement and delivers the material into a cylindrical housing 9 having an extension H) of smaller cross-sectional area and a reducing section I l between the hous ing and the extension. A shaft l2 extends through the housing 9 and extension ill to a point short of the end of the extension and carries helical conveyors l3 and M which are adapted to receive the powdered ma terial and to advance it toward and through the extension ID. The shaft l2 may be driven in any through the open end of the extension l0. To permit starting of the operation, it is nec essary to temporarily close the open end of the extension Ill. Otherwise the reverse flow of air will prevent the powdered material from falling into and moving through the conveyor. I there fore provide a bracket I‘! which supports a flap l8 of any suitable ?exible material such as rub ber, neoprene or fabric saturated with such ma terials. The flap i3 is slightly spaced from the open end of the extension Ill and is held on the bracket I‘! by nuts l9 and Washers 20 or any other convenient device.‘ When operation is initiated, the ?ap I8 ‘is forced against the open end of the extension It‘ by atmospheric pressure because of the'minus pressure within the con veyor. The powdered material will then ?ow‘ through the conveyor until a suitable plug is established in the end l6. However, after such a plug has been established and the pressure on opposite sides of the flap has been equalized, the ?ap again hangs free and does not prevent the release of the powdered material from the open end of the extension [0. The apparatus as described affords an effective solution of the problem of handling powdered material and particularly material which is dis charged from a chamber or receptacle operating under a pressure below atmospheric. The ap paratus has been utilized successfully, and it avoids the di?iculties which have been met here-. tofore in handling powdered materials under the suitable manner as for example by a belt or by conditions mentioned. Various changes may be made in the form and a motor. A sealing ring I5 is disposed about the 55 2,404,884 *4 _.' V I.’ construction of the apparatus without departing extension when a negative pressure exists within from the invention or sacri?cing the advantages thereof. I claim: . ‘ the extension. 2. In an apparatus for discharging powdered _ material, a housing having an inlet, an extension’ of reduced diameter connected to the housing, a rotatable shaft within the housing and extension, helical conveyor means on the shaft conforming ~ 1. In an apparatus for discharging powdered material, a housing having an inlet, an extension of reducedvdiameter connected to the-housing, a rotatable shaft within the housing and extension, ‘to, the diameters of thehousing,aridiextensionv helical conveyor means on the shaft conforming and terminating short of the end of the exten to the diameters of the housing and extension- l 01 sion, a ?exible flap so suspended adjacent and and terminating short of the end of the exten ' opposite the outer end of the extension that nor _ mally it exerts as appreciable pressure‘against ’ sion, the pitch of the conveyor means in. the,“ extension being such that its capacity slightly the outer end of the extension, said ?ap being adaptedto engage and close the outer end oi" exceeds that of the conveyor means in the hous ing and ‘a ?exible flap s0 suspended adjacent and -l 0 .the extension when a negative pressure exists opposite'the outer end of the extension that'nor-. -. 'within'the extension, and means for adjusting mally it exerts no appreciable pressure against, _ the position of the ?exible ?ap relative to the ‘outer end of the extension. the outer end of the extension, said ?ap being .. adapted to engage and close the outer end of the? ' , ' ' “ OLIVER T.-PIEPER.