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Патент USA US3092590

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June 4, 1963
H. F. lRvlNG
Original Filed Deo. l5. 1954
2 Sheets-Sheet 1
np: Z
June 4, 1963
H. F. lRvlNG
Original Filed Dec. 15. 1954
2 Sheets-Sheet 2
fg: 4
55 63a
United States Patent O
Patented June d, 1953
Referring now more particularly to the accompanying
drawings wherein i have shown preferred embodiments
of my invention and more particularly to FIGURE l,
the machine comprises a base iii with a drive housing 11
supporting bearings 12 and 13 in which a tubular drive
shaft 14 is journaled. A dri-'1e sheave 15 mounted on
the reduced end 14h: of the shaft 11i- is connected by
belts 16 to the shaft of a motor 17 which is adapted
Henry F. Irving, Saginaw, Mich., assigner to Baiser
Perkins Inc., Saginaw, Mich.
@riginal application Dec. 13, M54, Ser. No. 474,940, new
Patent No. 2,899,1365, dated Ang. 11, 1959. Divided
and this appiieation dan. 26, 1959, Ser. No. 789,031
3 Claims. (Cl. 21û--376)
to drive the shaft at relatively high speeds.
This invention relates to new and useful improvements 10
Formed as an integral portion of the shaft 14 is a
in centrifugal separating machines and more particularly
pressure fluid cylinder 13, the two portions of which
to continuously operable machines of this type which are
well~suited to separating a Variety of granular, fibrous, or
may be bolted together as at 19.
crystalline solids from liquid mixtures containing the
Continuously operating push-type, single stage centri
fuges have long been employed. for effecting the sepa
A piston 2d keyed in
the cylinder as at 21 so as to rotate therewith, is pro
vided in the cylinder 13, and is reciprocated in the cylinder
15 in a manner which will be later described.
A pusher
control assembly C of conventional design is provided to
control the forward operation of the piston 2u and the
piston rod or shaft 22 is transversely bored as at 23
ration of liquid and sol-ids and are relatively well known.
and longitudinally bored as at 24 to admit pressure fluid
However, it is an object of the instant invention to pro
vide a machine of this type which is particularly well 20 from the assembly C to the outer face of the piston 2t)
so as to drive the latter forwardly to the piston in which
adapted to separating sugar crystals from a slurry or
it is shown in FIGURE l. Provided in the shaft 14 and
mixture comprising the crystals and syrup or mother
communicating with the passage 23 when the piston is in
liquor although having a general adaptability for other
rearward position is a port 23a leading to the control
purposes. The present application is divisional from
application Serial No. 474,940, ñled December 13, 1954, 25 assembly C. Further, the internal diameter of the shaft
now Patent No. 2,899,065.
14 is enlarged as at 25 to transmit tluid to the control
assembly C through the transverse passage 25a when the
piston is moved forwardly and to admit fluid to the
is to design a machine of this type in which means is
front face of the piston when it is returned to original
provided for mixing the relatively wet strata of caked
solid directly adjacent the basket with the drier solids 30 position by ’re pressure of the material feeding into the
basket as will later be described. A positive displace
above it as the cake is discharged so that lumps or masses
ment constant delivery pump d4 (FiGU-RE 3) supplies
of sticky crystals which build up and break off will not
the pusher control assembly in a manner which will later
form on the dry housing wall adjacent the basket.
become apparent.
A still further object of the invention is to design a
The tubular shaft 14 extends from the drive housing
centrifugal machine of the type described which is durable 35
11 ‘into a wet housing 26 which is bolted to the housing
and rugged in construction, which comprises relatively
A principal object of the invention described herein
few component parts of a simple nature which are readily
accessible for cleaning and inspection, which may be
11 and a drum `or basket B is keyed thereon as -at 27, the
basket B comprising a radial end wall or hub 28 with a
easily and simply disassembled for repair and replace 40 perforated cage 29 having a screen 3d supported there
in. A frusto-conical pusher Wall 31 is keyed as at 32
ment of parts, and will accordingly be relatively inex
to the tapering end of the shaft 22 which extends into
pensive to maintain and which can be economicmly
the wet housing 26 beyond the shaft 1/1, and a nut 33
manufactured and assembled.
threaded on the end of fthe shaft 22 maintains the Wall
With the above and other objects in view, the present
invention consists in the combination and arrangement of 45 31 in position. The wall 31 has a laterally turned ñange
31a which is recessed as at 31h to receive a scraper ring
parts hereinafter more fully described, illustrated in the
34. Additionally, an accelerating funnel or distributor
accompanying drawings, and pointed out in the appended
member 35 having a laterally turned flange 35a is sup
claims, it being understood that equivalent changes may
ported a spaced distance from the portion 31a of the
be made in the various elements of the invention, without
departing from the spirit of the invention or sacrificing 50 wall 31 on circumferentially spaced, integral lugs or
bosses 36 formed on the ñange 31a so as to form pass
any of the advantages thereof.
ages 37 between the ñanges 31a and 35a leading to the
In the drawings:
screen 30. The funnel 35, it will be observed, is con
FIGURE 1 is a part sectional, side elevational View
centric with the screen 39 and is substantially ‘co-exten?
of my novel centrifuge showing the pusher in forward
therewith. The annular `flange portion 35a of the
funnel 35 terminates a spaced distance from the basket
FIGURE 2 is an enlarged, fragmentary, sectional view
thereof, the pusher being shown in rearward position.
FIGURE 3 illustrates schematically the manner in
30 and serves as a leveling ring.
The outer end wall of the funnel 35 is bored las at
which the pusher is actuated forwardly by a hydraulic
33 to freely admit the slurry supply pipe 39 and the in
another valve which is employed in the system to control
the valve shown in FEGURE 4.
FIGURE 6 is an enlarged, fragmentary view showing
the funnel and communicate with the passages 44 through
the flange 31a of the pusher wall 31. When »the wall 31
is in rearmost position as shown in FIGURE 2, it is
the material forcing the pusher rearwardly.
spaced from the hub 28 of the basket to form a chamber
pump and is permitted to return under pressure of the 60 terior wall thereof is recessed as at 4d to carry a pair
of superposed frusto-conical screens 41 and 42, the top
material feeding into the basket.
screen ¿i1 being a woven screen and the under screen
FIGURE 4 is a sectional View illustrating schematically
42) which supports the screen 41 being a mesh screen.
one of the multiple way valves which is employed in the
Connecting with the inner edge of the recess 4@ are an
FIGURE 5 is a sectional View illustrating schematically 65 guiar passages 43 which lead through the flange 35a of
FIGURE 7 is an enlarged, fragmentary View showing 70 45, and liquid proceeding through the passages 44 will
the circumferentially spaced lugs which connect the inter
pass yto the wet housing 26 through the circumferentially
mixing baffles to the basket throw-off ring.
spaced ports 45a in the basket B immediately adjacent
the wall 28 when the piston 20 is in its rear position
as well as when it is in its forward position.
The outer end wall of 'the Wet housing 26 terminates
short of the basket B and a throw-off ring 46 including
an outwardly tapered flange 46a extending into a dry
housing 47 is provided on the outer end «of the basket
B. Supported outwardly of the flange 46a to rotate with'
the basket B is a frusto-conical baille member 49 which
includes a lateral ñange 49a projecting radially inwardly
beyond the screen 30 to channelthe solids discharged
down to the passage 50 defined between the rearwardly
and inwardly extending portion of the baffle 49 and the
ring 46. The baffle portion 49 is secured to the base of
the member 46 by widely spaced lugs 43 which also sup
port a forwardly and outwardly extending truste-conical
baffle member 51 which directs the flow -of solids from
the annular passage 50 to the dry housing proper. The
bañies 49 and 51 effect a through intermixture of the
shaft 14 has an annular ring 851; disposed between these
flanges 84 and clearly as the piston 20 moves forwardly,
will -tend to force the slide 79":to the right.
Passages 86, 86a, 87, 88 and 89 communicate with the
interior of the cylinder 8G, the passages 86 and 86a com
municating with a line 90 leading to the reservoir, the
sage SS
63, and
87 communicating with a line 91 leading to a
9‘2 in the one end Wall of the valve 65, the pas
communicating with a line 93 leading to the line
the passage S9 communicating with a line 94 lead
ing to a passage 95 in the opposite end wall of the valve
65. During the forward motion ofthe piston 20, the lines
93 and 94 are in communication to keep the valve 70 in
the position in which it is shown. By the time the piston
2.0 has reached the front of the cylinder and is beginning
to «be pushed rearwardly (see FIGURE 6), the slide 79
has been moved to the right to open up the passage 87
and line 91 to the passage 88 and line 93 and to permit
relatively wet solid particles immediately adjacent Áthe
the line 94 to exhaust to the passage 86 which leads
, screen and the relatively drier particles inward thereof 20 through the line 90 to the reservoir 62. Thus, pressure
in a manner which will be later described. The parti
fluid is forced through the line 91 to move the slide 70
cles which were disposed in the caked mass immediately
to the right and open up the passage 77 and line 68 above
adjacent the screen may have a residual liquid content
the valve 65 to the passage 74 and line 63 below the valve.
of from 4% to 6% by weight, and this is what is meant
Further, the line 63a will now exhaust to the line 6811 as
by the term “relatively wet” as used in the specification
the piston 20 moves rearwardly. Since the line 96 lead
and claims. The liquid content of the solid particles in
ing to the reservoir 62 is always open to the line 68, the
oil forced through the line 68 Will take the path of least
ticles will be 1% to 2% by weight and these particles
resistance (the line 96) back to the reservoir 62 and will
will be accordingly termed “relatively dry.”
not force the piston 29 rearwardly. As the slowly build
The mixture may be Washed in the pre-draining stage 30 ing cake (see FIGURE 6) moves the piston 20 rearwardly,
of centrifugation by the laterally directed spray from a
however, oil from the line 68 under virtually no pressure
hose 52 which enters the stationary supply pipe 39 through
will lill the space in front of the piston 20 and this is
a seal 53 and has a nozzle 52a on the end thereof for
very important since the- system must be maintained in
directing the wash liquidto the solids on the sides of
centrifugal balance. The piston 20 will accordingly have
the cake which are located radially inward of these par
the funnel 35. The spray from a second wash hose 54 35 a very rapid forward stroke and a relatively slow return
can be directed to the material on the inner portion of
stroke controlled by the amount of solid particles being
the screen 3i) to remove any remaining impurities. Par
deposited at S' (see FIG. 6). If it appears that the rate
titions 55,56 and 57 separate the wet housing 26 into
of feed is not suñicient to build the cake up to the leveling
compartments 58, 59 and 60 which can be drained olf
ring 35a, a conventional relief valve 97 which interposes
separately through the discharge pipes 61 and, as will be 40 resistance in the line 68a leading to the reservoir 62 can
apparent, the so-called green and wash liquids may be
be cut in to slow the return rate of travel of the piston 20.
segregated in this manner. A conveyor (not shown)
A system such as described wherein the return travel of
may be provided in the lower portion of the dry hous
the piston 20 depends on the rate at which slurry is fed
ing to carry voff the dried and interrnixed crystals.
into the system through the pipe 39 and the rate at which
The pusher wall 31 is shown in rearward position in 45 the cake builds is superior in a great many respects to
FIGURE 2, and it will be clear that` this wall »is moved
conventional machines. Obviously, there Will not be a
forwardly to the position in which it appears in FIGURE
continuous working of the crystals of the continuously
1 when pressure iiuid reaches the rear face of the pis
building cake which will mean less crystal breakdown and
ton 20 through the ports 23a, 23, and 24, and exhausts
less passage of crystals through the screen 30. Further,
from `the front of the piston through the passages 25 50 the rates of feed are often very different and the machine
and 25a. This pressure iiuid is supplied from a reser
can operate very eñiciently at both low and high rates of
voir 62 `(see FIGURE 3) through lines 63 and 63a by
feed. In the former case, the cake will be permitted time
'the pump 64 which forces the fluid through a multiple
to build up to the leveling ring 35a so that it will have a
way valve 65 and thence into the colllection chamber
maximum retention time on the screen 30. As the piston
66 in the collector C. The iiuid which is forced out of 55 20 moves rearwardly, the ring 85b will, of course, return
Vthe cylinder 18 when >the piston 20 moves forwardly
the slide 79 to the left yback to the position in which it is
moves Íthrough the passages 25 and 25a in-to the collec
shown in FIGURE S and the slide 70 will accordingly be
‘tion chamber 67 in the collector C, thence :through a line
returned to the left as shown. The stroke of the continu
»68, back -to the valve 65, and finally into a line 68a which
ously reciprocating wall 31 is such as to discharge only
leads to the reservoir 62. Alternatively, the ñuid 'could
the front portion of the caked solids S which are virtually
return lthrough the line 96 which will later be discussed.
free of liquids lto the dry housing 47.
The valve 65 (see FIGURE 4) is formed with an in
In operation, the sugar slurry or massecuite reaches
'terior cylinder 69 in which «is a slide 70 having lands 71,
the interior of the basket through the stationary pipe 39
71a, 72, and '73. Passages 74, A75, 76, '76a and 77 which
and funnel 35 which gradually accelerates the mixture
«communicate with the lines 63, 63a, 68h, 68a and 68, 65 prior to discharging it through the passages 37 to the
respectively, lead into the cylinder as shown, and in the
screen 3l). The greater proportion of mother liquor is
position in which the valve is depicted the lines 63 and
drained off to the wet housing 26 through the screens 41
63a and 68V and 68a, are clearly in communication, and
and 42 prior to the time the mixture reaches the screen
the piston 20 is accordingly moved forwardly. The po
3d and a portion of the washing operation to remove im
sition of the member 70 is controlled by another multi 70 purities not carried olf with the mother liquor can also
ple-way valve 78 which has a slide 79 in the cylinder
-be carried out during this pre-draining operation. Liquid
-80 formed therein. The one end of the slide 79 which
pre-drained through the screen 41 travels rearwardly
vhas interior lands S1 and 82 extends from the valve hous
through the meshes of the screen 42 which is within the
ing and has spaced-apart flanges 84 thereon. A pin 85
recess 40 and thence proceeds through the passages 43
íìXed on the shaft 22 `and movable in a slot 85a in the 75 and 44 to the chamber 45 rearwardly of the pusher wall
31. Ports 45a as previously noted, drain the space 45
to the chamber 58 in the wet housing 26. The wash
hose 52 delivers a prescribed spray of water to the mix
separating drum means therein including a iirst end and
a terminal end; means feeding a mixture, comprising liquid
components which will pass through said drum means and
`solid components which will be retained on the interior
peripheral surface, to said first end of said drum means;
a dry housing adjacent the terminal end of said drum
means; means for discharging the solid components re~
ture on the screen 41 which is insufficient to ilood the
retained solids such that dilliculty will be encountered in
pushing them when they reach the screen. When the
solids reach the latter screen 3i), there is, of course, a
relocation of the solid particles as they pass from the
screen 41 and the hose 54 thence completes the washing
tained on said drum means from the terminal end of said
drum Imeans to said dry housing; and deflector means
10 mounted on said terminal end of -said drum means in
When the solids are discharged from the outer end
of the screen 30 by the pusher wall 31, the relatively
drier particles which were located in the cake substantially
inward of the screen tend to be farmed outwardly, while
particles immediately adjacent the screen which are rela
tively “wet” will not necesssarily be perceptibly thrown
cluding a first baille spaced generally axially outward from
the drum means having a section generally radially spaced
outwardly from the terminal end of the ydrum means »to
receive solid components discharged generally radially
from said drum means and inclined inwardly relative to
the drum means, channeling the solids discharged in an
axially inward direction to intermix the relatively wet solid
axially outward of the screen and in conventional ma
chines would leave the flange 46a of the ring 46 in sub
components immediately adjacent the inner surface of
stantially a radial path. These relatively wet and sticky
said :drum means with the drier solid components radially
crystals tend to collect and in many instances will adhere 20 inward thereof; `a second baille, including a section dis
and build up on the partitioning wall separating the Wet
posed to receive solid components from the inwardly in
and dry housings before breaking off in relatively large
pieces. Since this disposition is unsightly and :the col
lections of sticky crystals are undesirable in the finished
product, I have found it practical to intermix the relatively
wet and relatively drier particles. The portion 49ay of the
baille 49 catches and dellects the relatively dry particles
inwardly to the channel 50 so that they pass through `and
become thoroughly intermixed with the wetter particles.
clined section and located radially outwardly of said in
war-dly inclined section, inclined outwardly relative to the
terminal end of said drum means to reverse the path of
travel of the components and return them axially out
wardly to said dry housing; and means for rotating said
drum means.
2. The combination defined in claim l in which said
bañles are generally frusto-conical in shape.
3. The combination defined in claim l in which cir
The resulting intermixture will not collect on the parti
tioning wall referred to and will provide a uniform
cumferentially spaced, radially disposed lugs mounted by
It is to be understood that the foregoing drawing .and
said drum means support said bañles in position on the
terminal end lof said drum means.
description thereof is in all cases to be taken as merely
illustrative of the invention rather than as limiting the 35
scope thereof and for a determination of the scope of
the invention attention is directed to the appended claims.
It is further to be emphasized that various equivalent
changes may be made in the various elements which com
prise the invention Without departing from the spirit of 40
the invention or the scope of the claims.
I claim:
1. In a centrifugal machine; a wet housing; perforated
References Cited in the iìle of this patent
Schmelzer _____________ _.. Sept. 1,
Hertrich _____________ __ Feb. 22,
>Ruegg ________________ __ Aug. 3,
Cox ________________ .__ Aug. 17,
Ruegg _______________ __ Jan. 24,
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