вход по аккаунту


Патент USA US2404884

код для вставки
July 30, 1946.
Filed March 12, 1945
Patented July 30, 1946
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) "
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
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
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
. 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
*4 _.' V I.’
construction of the apparatus without departing
extension when a negative pressure exists within
from the invention or sacri?cing the advantages
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? '
Без категории
Размер файла
314 Кб
Пожаловаться на содержимое документа