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PatentedA sept. 24, 1946
f, ,
UNITED sTATEs >115.gifENT ÍoFFlcr.,
.Joe Crites, Evanston, Ill., assigner to'Colnbus'- `
>tion Engineering Company, Inc., New-York,
N. Y., a corporation of Delaware
Application January 26, 1944,*seria1No. l519,763
This invention relates to certain new and use
v hold a fixed position. y*On the contrary, itwhips
ful improvements in cyclone dust collectors and
has for itslprin'cipal object Ythe provision of im
or thrashes about within the restricted lower end
, of the casing and picks :up the precipitated dust
from the outer spiral near the wall of the col
lector. This dust is, therefore, held in the low
pressure ’spiral and carried out of the separator
proved constructions whereby a large percentage
of .the dusty maybe removed vfrom dust laden
air in-al cyclone separator.
A cyclone separator of ordinary construction
casing with thev discharged air.
includes rarcylindrical upper portion and a lower
One of the principal objects> of the present in
conicalportion which terminates in adischarge
vention isto provide a new and simpliñed con
spout. j The dust laden air is introduced -into the 10 struction for’recapturing thedust picked up by
cylindrical- upper portion of the separator at a
the low pressure inner spiral of vair which is -with- .
tangent tov the inner surface thereof.
The whirl- `
`>in the outer or dust precipitating spiral of a cy
ing of the air forms within the -casing two con
centric spirals. The outer spiral` has a'higher
A further objectîis- to_accomplish the. above
pressure and moves downwardly toward the apex 15 specifiedl objects‘fby means of ya by-pass which
of the separator. It functions to Vprecipitate the
end of the separator so that it will b'e I'eprecipi
tated in the separator and thereby make it prac
ticable ïto remove substantiallyrall dust from the
>The dust particles carried in the air, `o_l" the - Vair in a -sin'gle_'separator. o
outer spiral lare .thrown .outwardly toward the
A preferred embodimentv of the/invention is il-I
side ofY the casing, while the air, _cleared ofthe
lustrated in the accompanying drawing, wherein:
dust, moves tangentially inward toward the ver
_ Eig.„ll_i'_s ayertical'section taken through the
tical axis of the separator to form the inner low 25 cyclone separator constructed in accordance with
pressure spiral which, as previously mentioned,
this invention; and
moves upwardly and discharges the air through
i ._Fig. 2 is a fragmentary sectional view taken
a central opening in the upper4 portion of the
on line 2,-2 of Fig. 11.
’ .
' I
The’ separator herein shown is of the cyclone
The dust particles carried ¿in the air of the 30 type and >includes a 'cylindrical upper portion I0
outerspiral and thrown outwardly toward the
wall ofthe >separator casing create a dust strata
which has its maximum density adjacent the wall
of the separator. This dense strata maybe _rela
and akconical lower portion II. The lower end
is closed by a revoluble discharge valvev I2, »posif
tioned in a] discharge spout structure I3.V The
valve, it> wilLbe'notedL is of such construction as
tively thin inithe upper portion of thefcasing 35 topermit the discharge of Vvmaterial from the cas
because of its greater diameter, but the thicknessv
ing butwill" prevent. the entrance ofv air into the
of the V'strata increases as it moves downwardly
lowerv end of the casing. Y ,_ " . "
with the outer spiral >into the restricted lower
portion of the cone-shaped collector. Y,Cnlor'iseà
interceptsjthejdust picked vup by the said'low
pressure. inner spiral and redelivers it to the inletv
dust'from the air. The inner spiral has a lower
pressure >and moves vupwardly within the casing.
Its function is to discharge theair from the sepa
vrator l after. the- dust has" been removed.
[Atthe upper end of the separator is an air
exit piper I4l„`which extends downwardly a sub-y
quently, at the lower portion of the collector, the 40 stantial distanceinto the upper end ofthe cas
inner or less dense portion of the dust strata is
ing.' 'The said 'exit pipe is arranged to be con
brought into vcloser relation _to the ,boundary of
centric withnthe. axis of the separator and con
the inner'low pressure spiral, whereby >variations
¿nectstwith‘an air _discharge pipe I5. The dust
inA .air pressure, or otherrvariable influences may
isintroducedinto the cylindrical upper
cause portions of this suspended dust to be ydrawn 45 ladenair,
portion of the 'casing through a conduit I 6 which
into the said inner spiral and` thereby carried
cormniuni'pates'A with the separator casing'through
out> of thev separator with the discharged air.
-.wide nozzle lI'I offordinaryv construction so as
However, the dust lost4 from a cycloneV separator
.to the 'dustladen air a whirling move
is not necessarily confined to dust held in sus
nient within >the.separatori casing. „ Theflow pat#
pension inthe above manner. On thecontrary,
50 tern formed by the air within the casing con
much of theïdust lost from a cyclone separator
sists of an outer spiral substantially as indicated
Vmay have been previously Vprecipitatedrfrom the f by the feathered arrows.
This spiral moves
air and then subsequently picked up by a stem
ldownwardly from the inlet toward the discharge
ylike suction column formed at the lower -end of
end of the casing; The whirling motion of the
the inner spiral. This stem-like column does not 55 air serves to throwl the dust particles outwardly
toward the casing so as to form a dust strata
which has its maximum density adjacent the wall
of the separator and moves downwardly along
hood where this dust, together with the dust
picked up by the stem-like column I9, is deliv
ered by conduit 20 into the inlet end of the sepa
the inclined wall of the casing into t'he restricted
lower neck of the casing substantially as indi
cated by the dotted film of dust material shown
at I3 in Fig. 1.
rator casing.
With the present embodiment of the inven
The air, separated from the dust particles,
moves inwardly to form an upwardly moving
inner spiral, the greatest diameter of which con- _
forms to the diameter of the air exit pipe I4.
This inner spiral of air is of lower pressure than
being precipitated, to draw the dust agitated by
the inner spiral of air downwardly beneath the
the outer, or dust precipitating, spiral and ter
minates at its apex in a stem-like column I9.
Inasmuch as the diameter of the upper portion
tion there will be a constant discharge of dust
laden air through the central conduit 20, but it is
returned to the conduit I 6 and reintroduced with
the other dust laden air into the inlet end of
the separator. The air that is discharged
through the air conduit I5 is substantially free
of suspended dust particles. Tests, in this regard,
have shown the improvements of the present in
cention which, when applied to a cyclone sepa
of the casing is relatively large,r the dust strata
rator, will recapture approximately two-thirds
formed in this portion of the casing is relatively
of the dust which would otherwise be lost,
thin. However, it increases in thickness toward
I claim:
the lower end of the separator. Consequently
l. A cyclone separator comprising, in combi
there is a strong tendency for the dust, particu 20 nation, a conical separator casing having a cen
larly the less dense portion of the strata, to be
trally arranged air discharge in its upper end,
picked up by the inner spiral. In addition to the
means including an inlet conduit for introducing
dust picked up by the inner spiral inthe Zone
dust laden air into the upper portion of the cas
where the inner andk outer spirals meet, the
ing tangentially to the inner surface thereof to
whipping about of this stem-like column within
form a downwardly moving dust precipitating
the restricted area of the separator casing has
outer spiral of air and an upwardly moving inner
a pronounced tendency to agitate the precipi
concentric spiral ofV air being discharged, and
tated dust in the restricted lower end of the
means comprising a vertically disposed inter
casing so that this dust will rbe picked up and
ceptor conduit varranged concentric to the sepa
held in suspension in the inner low pressure spiral - rator casing and extending upwardly through the
of air and carried out of' the casing through -the
casing and said discharge to the exterior of the
exit pipe I4.
casing and provided at its lower end with an in
In order to overcome this -objection the present
verted hood of greater cross-sectional area than
invention includes the provision of a suction con
said conduit and positioned with its open lower
duit which extendsdownwardly through the sep- -‘ end portion vin close relation to the restricted
arator in alignment with the axis thereof so that
lower end of the separator and said conduit com
»the dust, set inmotion at the zone where the
municating at its other end with the inlet end
inner and outer spirals meet and by the said
of the separator, a fany interposed in said inter
stem-like column I9 of the low pressure inner
ceptor conduit whereby dust suspended in said
spiral of air, will be drawn upwardly through the
inner spiral of air at the lower portion ofthe
said conduit 2D by the action of a fan 27|, inter
separator is intercepted by said hood and directed
posed in the said'conduit, and delivered into con
through said interceptor conduit to the inlet con
duit I6, whereupon it is returned to the inlet end
duit of the separator.
of the separator to be again precipitated from
2. A cyclone separator comprising, in combina
the air.
tion„a conical separator casing, a centrally ar
Preferably, the conduit 20 is composed of two
ranged ai'rr discharge pipe extending into the up
sections, the upper section being fixed to the air
per end of the separator, means for introducing
pipe I3 by any suitable means,4 for example, a
dust laden air into the upper portion of the cas
ñashing 22. The lower end of the «said conduit U ingV tangentially to the inner surface thereof. to
20 is designated by the reference numeral 23 and
form a dust precipitating outer spiral of air and
is adjustable relative to the fixed section 20. The
a. low pressure inner spiral for the air being dis
lower end of the adjustable section 23 is provided
charged, a centrally disposed by-pass conduit for
with a suction hood 24. of greater diameter than
conducting dust particles suspended in the lower
the conduit and is arranged with itsV open end
portion of _the separator to the dust inlet of the
downwardly, Preferably the diameter` of the " separator, the said by-pass conduit including an
hood is equal to approximately one«half of the
upper section rigidly mounted on the upper end
air exit pipe I4. The said adjustable section is
of the separator, a rod adjustably suspended from
supportedby means of a rod 25 which extends
out of the conduit 20 at the bend 26 thereof.
Preferably a flashing 21 is provided with a collar
28 through which the upper end of the rod 25
extends. The said upper end of therod isfpro
vided with a series of apertures 29, through which
a cotter key 3l!> may be inserted to support the
rod and the hood 24 in any predetermined ad
justed position. By raising and lowering the acl
justable hood section of the conduit 20„it can. be
positioned in such locations- that it will function,
under different pressures. and volumes of dust
the upper endof the by-pass conduit, a lower
section slidably supported within- the upper sec
tion of said 'conduit connected to the lower end
of said rod and formed with a downwardly open
ing hoodV of greater cross-sectional area than the
said upper section, wherebythe position of the
hood may be adjusted relative to the wall of the
restricted lower end of the separator to vary the
air pressures at the lower ends of the concentric
spirals of air within the casing.
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