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Патент USA US2405624

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Aug. 13, 1946.
4.1;. WATSON. r-rrm.
’ 2,405,624
' Filed April 9, 1943
2 Sheets-Sheet I
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Laws C. M11
E39 N46.
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Patented Aug. 13, 1946
John E. Watson and Louis C. Whiton, Westport,
Conn, and Charles B. McBride, Port Chester,
N. Y., assignors to Prat-Daniel Corporation,
Port Chester, N. Y., a corporation of New York
Application April 9, 1943, Serial No. 482,470
5 Claims. (Cl. 183—34)
Our present invention relates to an apparatus
for cleaning air or freeing it from dust in sta
tionary installations and in moving conveyances.
Fig. 1 is a longitudinal section of a separating
apparatus embodying our invention;
Fig. 2 is a vertical view of the apparatus taken
on the line 2-2 of Fig. 1;
Fig. 3 is a horizontal section of the apparatus
taken on line 3-3 of Fig. 2.
suspended particles carries them past with that
part of the air which passes through the passage
ways 48.
The cleaned air thus drawn into the draw-off
elements 46 passes upwardly through openings in
the partition 47! into a draw-oil or outlet chamber
50 immediately above the intake or inlet passages
42. Itwill be understood, of course, that all of
the air cannot be drawn into the elements 46 be
In the separation of dust particles of moving 10 cause it would carry with it too large a proportion
of the suspended particles, but that a smaller
currents of air the mixture of air and dust is
amount up to thirty-five or forty per cent may
subjected to a centrifugal or other separating ap
thus be withdrawn without checking or slowing
paratus, the size of which is dependent primarily
the forward velocity of the air to such an extent
on the quantity of air or gas from which the
particles are to be separated. It is desirable to 15 as to draw coarse suspended particles into the
reduce the quantity of air that must be passed
through the ?nal separating apparatus, particu
larly on moving installations, in order to reduce
as much as possible the size and weight of the
separating apparatus.
In our present invention, therefore, we provide
a preliminary separation or segregation of the
air to be treated into a stream or streams carry
draw-off” elements 46.
The air passing through the passageways 48
thus contains substantially all of the suspended
particles and then passes to centrifugal separators
20 5| extending vertically in the passages 42.
upper end of each of these centrifugal separators
5! is provided with tangential inlet or inlets and
is otherwise closed except through an open ended
off-take pipe 52 which extends into the centrifugal
ing the suspended particles or dust and a stream
or streams of relatively clean air which is then 25 tubes 5! to form an annular space and which also
extends through the partition 41 to deliver into
withdrawn so that only the air or gas in which
the off-take passage 50.
the suspended particles have thus been concen
The dust or particle laden air enters the tan
trated need be passed through the centrifugal or
gential inlet or inlets and passes through the
other separators for the complete separation of
annular space in a helical movement to the bot
the dust or suspended particles.
tom of the oiT-take pipe thereby throwing out the
In the embodiment of the invention shown in
particles by centifugal action.
the drawings air to be cleaned is supplied through
The separated dust or particles travel down
a passage 42. The passage 42 is divided by parti
through the tube 5! and through conical adapters
tions or walls 43 into a number of separate cor
53 together with a small amount of the air and
ridors or compartments 44 which may be closed
are then passed into collecting conduits or headers
by individual dampers 45. After passing the
54 which in turn deliver to an exhaust conduit or
dampers 45 the air passes between a number of
manifold 55. The cleaned air delivered to the
de?ector and draw-01f elements 45. These de
outlet passage or chamber 50 passes a control
?ectors and draw-off elements comprise vertical
damper 55 into delivery passages 51.
conduits extending downwardly from and open- '
It will be apparent that the velocity of the dust
ing through the top wall 41 of the chamber 42.
They are spaced to provide parallel passageways ~ laden air and the suspended particles increases
on entering the passages 48 and a maximum
48, Fig. 3, between the draw-off conduits and are
velocity is reached in passing through the throat.
shaped front and rear to offer a minimum of air
a; Q1. The inertia of the particles at this increased
velocity tends to propel them in straight lines
Air passing through the passageways 48 car
ries with it the suspended particles, particularly
through the expanding portions of the Venturi '
the heavier and coarser ones, while a part of the
air is withdrawn largely freed from the suspended
passages toward the centrifugal separators 5!.
In the expanding portions of the passages air
particles or particularly the heavier particles, 50 or gas may move sideways because of its rela
tively small inertia out of the direct path of the
through openings 49 extending in reverse direc
particles propelled through the central part of
tion into the vertical draw-01f elements 46. It
this expanding passage and may then enter the
will be understood that in being drawn through
sidewise passages 49 and be drawn off into the
the passages 49 the direction of the air is sub
off-take chamber 50. The amount of air or gas to
stantially reversed while the momentum of the
be treated in the separators 51 is, therefore, much
4. Means for separating suspended particles
reduced and the number and size of these separa
tors may be reduced proportionately.
from gases which comprises a plenum chamber
having an inlet, separating means in said plenum
chamber for separating suspended particles from
What we claim is:
1. Apparatus for separating suspended particles
from air which comprises a centrifugal separator,
gases, an o?-take chamber to receive clean gases
from said separators after the removal of sus
a Venturi passage comprising a throat and an ex
pended particles therefrom, means between said
panding passage leading from said throat to said
inlet and said separating means for dividing the
centrifugal separator and draw o? passages from
air passing to said separators into separate
said expanding passage transverse to the direc 10 streams, said dividing means forming passages in
tion of ?ow therethrough.
parallel each having a contracted throat and an
2. Apparatus for separating suspended particles
expanding passage leading therefrom toward said
from air which comprises a centrifugal separator,
separating means and means for withdrawing
a supply conduit for said centrifugal separator
gases from said expanding passages in a direction
and means for dividing said supply conduit into a 15 transverse to the ?ow of said streams there
number of parallel Venturi passages each having
through and for passing said separated gases to
a throat portion and an expanding portion lead
said o?-take chamber.
ing from said throat toward said centrifugal
separator and draw 01f passages from said ex
5. Apparatus for separating dust particles from
gases which comprises a plenum chamber having
panding portion transverse to the direction of 20 an inlet, means in said plenum chamber for sepa
flow through said expanding portion.
rating suspended particles from gas, an o?-take
3. Apparatus for separating suspended particles
chamber to receive clean gas from said separating
from a ?owing gas which comprises separating
means, a Venturi between said inlet and said
means for separating said suspended particles
separating means comprising a throat and a pas
from said ?owing gas, a conduit for supplying 25 sage expanding from said throat toward said
said gases to said separator, parallel partitions in
separating means, and means for drawing gases
said conduit, said partitions being of decreasing
from said expanding passage in a direction trans
width toward said separator to form parallel pas
verse to the direction of flow therethrough and
sages each‘ having a narrow throat and expand
for passing said separated gas to said off-take
ing from said throat toward said separator, said 30 chamber.
partitions having draw off openings from said
_ expanding parts of said passages transverse to the
direction of ?ow through said passages.
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