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Патент USA US3073544

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Jan. 15, 1963
R. F. VOKES
3,073,535
PAPER MACHINERY
Filed March 24, 1960
2 Sheets-Sheet 1
INVENTOR.
ROBERT F. VOKES
ATTORNEYS
Jan. 15, 1963
R. F‘. VOKES
3,073,535
PAPER MACHINERY
Filed March 24, 1960
2 SheetSI-Sheet 2
lo 1/00 I05‘
FIG-1O
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INVENTOR.
ROBERT F. VOKES
BY
ATTORNEYS
United States Patent ()??ce
3,673,535
Patented Jan. 15, 1963
1
3,073,535
PAFER MACHINERY
2
FIG. 6 is a fragmentary view in perspective showing
another construction of bedplate which incorporates a _
screen section or extractor plate and is adapted for use
Robert F. Vohes, Middletown, Ohio, assignor to The
Black-Clawson Company, Hamilton, Ulric, a corpora
in the apparatus of FIG. 1;
FIG. 7 is a fragmentary View of the face of still am
Filed Mar. 24, 1960, Ser. No. 17,282
6 Claims. (Cl. 241-46)
other construction of bedplate which incorporates slots
for the extraction of re?ned stock;
tion of Ohio
HG. 8 is an enlarged fragmentary section on the line
7 This application relates to pulping apparatus for liquid
848 of FIG. 7;
;
slurry stocks such as paper making stock.
10.
FIG. 9 is a front view of a rotor and bedplate assembly
The invention has special relation to pulping'apparatus
constructed in accordance with the invention and mounted
of the type' wherein the stock to be pulped is contained
on the side wall of the tub;
in a tub which is provided with a rotor or impeller
mounted in the bottom or side wall thereof for rotation
on an axis causing outward circulatory movement of the
stock in a generally vortical pattern which creates hy
PEG. 10 is a section on the line 110-10 of FIG. 9; and
FIG. 11 is an enlarged fragmentary section on the line
" ll—ill of FIG. 10.
Referring to the drawing, which illustrates a preferred
draulic shearing forces in the stock and thereby effects
embodiment of the invention, PEG. 1 shows pulping ap~
the desired pulping or de?bering action. Pulping appa
paratus which is generally of the construction disclosed
ratus of this general type is employed in both batch and
in Martindale Patent No. 2,371,837 issued March 20,
continuous operations, and the invention is equally ap 20 1945 to the assignee of this application. This pulper in
plicable to both types of operation.
cludes a tub or vat having a cylindrically extending upper
It is a primary object of this invention to provide pulp
wall portion lib, an inwardly tapered lower wall portion
ing apparatus of the above general type wherein the rotor
fl and a bottom Wall 12, and it is carried by supports
is of novel and improved structural characteristics which
13 of any suitable character. Arranged below the tub is
not only give increased general efficiency of operation
a gear drive 15 shown as driven by a pulley 16 from a
but which in particular make it possible to obtain effec
suitably located motor (not shown) and the gear drive
tive slushing and de?bering simultaneously on even the
155 drives a vertical shaft 17 which supports a rotor 20
hardest pressed pulp and stocks such as wet strength, un
for rotation centrally of the bottom portion of the tub.
bleached kraft and hard White stock.
In operation, the rotor 20 provides an effective circula
A further object of the invention is to provide pulping 30 tion outwardly and then upwardly along the outer por
apparatus as outlined above wherein the improved opera
tional characteristics are obtained by a novel construc
tion and mode of cooperation of the rotor with a bed
plate having a grooved working surface which assure that
substantially all the particles in the stock will be forced
tions of the tub in a generally vortical pattern providing
a return ?ow-towards the impeller, as indicated by the
arrows in FIG. 1, and stationary guide plates 21 are
mounted on the wall portion 11 to guide the upward ?ow
of the partially pulped stock. Adjacent the bottom of
repeatedly into rubbing engagement with the working
surface of the bedplate.
the tub is an annular chamber or compartment 22 parti
It is a special object of the invention to provide a
rotor as outlined above wherein a plurality of outwardly
screen or extractor plate 25 of frustoconical form which
tioned from the space above the impeller by a perforate
permits the passage to the compartment 22 of pulped par
projecting blades each includes a leading edge surface of 40 ticles which have been sufficiently reduced in'size to pass
substantial area which is inclined toward the working
through the perforations of this screen 25. This pulped
surface of the bedplate in operation in such a manner as
stock may be withdrawn from the compartment 22 con
to urge the stock toward the bedplate as the rotor rotates.
tinuously or batch-wise, by way of the conduit 26 and
lIt is also an object of the invention to provide a rotor
control valve 27.
as outlined above which is of essentially smooth con 45
The present invention is concerned particularly with
struction over its upper surface and includes no pumping
the construction of the rotor 2t} and the cooperating
vanes other than the leading edge surfaces of the vanes
bedplate 30 as now described. Referring to FIGS. 2 and 3,
as noted above so that the entire pumping action of the
an annular bottom support 31 is secured as by bolts 32
rotor derives from these leading edge surfaces.
A still further object of the invention is to provide
pulping apparatus having one or more of the features
noted above and‘ which in addition incorporates a bed
plate of perforate construction through which extraction
of the re?ned stock can take place.
to the annular ?ange portion 33 of the tub It}. A cir
cular wall member 35 which de?nes the inner wall of the
compartment 22 is mounted on the ?ange 33 at the Y
periphery of the support 31 and supports the ring 36
which in turn supports the inner periphery of the screen
25.
Additional objects and advantages of the invention will 55 The bedplate 36 comprises a plurality of segments 40
be apparent from the following description, the accom
panying drawings and the appended claims. .
which are secured as by bolts 41 to the ring 36 and
to the outer periphery of a support plate 42, 'and- the
In the drawings—
connections between the segments 40' and the ring 36
FlG. 1 is a view partly in side elevation and partly
broken away in vertical section showing pulping ap 60 and support plate 42 are sealed by suitable gaskets 43.
As best seen in FIG. 5, the segments 40 are provided with
paratus embodying a rotor constructed in accordance with
grooves 44 extending radially of the surface of the seg
the invention;
I
ments and alternating with smooth areas or lands 45 to
FIG. 2 is a plan view of the rotor in FIG. 1 and a
form a grooved or ribbed working surface, and the grooves
fragment of the associated screen or extractor plate;
FIG. 3 is an enlarged fragmentary view in radial sec 65 44 are also con?gured as shown to provide relatively’
tion on the line 3-3 of H6. 2 with the vane shown in
elevation;
FIG. 4 is an enlarged detail view in plan of one of the 7
sharp edges on the lands 45.
g
The rotor Zll includes a rotor body 5*!) having a depend
ing skirt 51 which is received over the upper end of’
component vanes of the rotor of FIG. 2;
the shaft 17 and is ?tted on its outer surface with a
FIG. 5 is a sectional view taken on the line 5—5 of 70 sleeve 52. Packing 53 forms a seal between the outer
“FIG. 4 and including a fragment of the associated bed~
plate;
surface of the sleeve 52 and a cylindrical housing 55
which depends from the inner periphery 'of the support
3,073,535
plate 41 and carries a packing gland 56 as shown in
FIG. 3.
The rotor body 50 carries a plurality of vanes 60 which
project outwardly therefrom in overhanging relation with
the working surface 44 of the bedplate. As best seen
in FIGS. 3 and 4, each vane 60 includes a ?ange portion
61 by which it is bolted at 62 to the annular surface
portion 63 of the rotor body 50. A rotor cap 65 covers
the top of the rotor body 50 and is secured thereto as
A
mediately above the support 31 and to convert it into an
extraction chamber similar to the chamber 22 as described and to which a suitable discharge pipe may be
connected.
The same rotor 20 as already described may
be used with the extracting, bedplate 30-82 and will pro
duce similar results, and it is also possible with either
rotor to omit the bars 82 and use the perforate sur
face 81 as the working surface of the bedplate.
FIGS. 7 and 8 show a further modi?cation of a bed
by bolts 66, and it extends over the ?anges 61 to form 10 plate construction which could be substituted for the seg'
ments 40 described. The bedplate segment 90 in
an essentially smooth outline on the rotor limiting its
FIGS. 7 and 8 is similar to the segments 30, including
pumping action to the leading edge surfaces of the several
similar grooves 91 providing ribs 92 therebetween. Cer
vanes 60 as now described.
tain of these grooves 91, however, are continued through
Referring particularly to FIGS. 3 and 5, the working
portion of the vane 60 which projects beyond the rotor 15 the surface of the plate to form slots 93 through which
the pulped stock can be extracted, and it will be noted
body 50 has a substantially ?at undersurface area '70
that these slots 93 are tapered to enlarge downwardly in
which is parallel with the working surface of the bedplate
order to facilititate the discharge therethrough. These
30. In assembling the rotor, the vanes 60 may be
segments 90 may be utilized in the same manner as de
of the bedplate by means of one or more shims 71 20 scribed for the unit {ill-82 in the assembly of FIG. 2,
located in predetermined spaced relation with the surface
positioned between the underside of the vanes and the
upper surface of the rotor body portion 63 as shown, or
a similar arrangement of shims may be provided at the
requiring only conversion of the space immediately be
low the bedplate into the chamber for the extracted
stock.
with the vane surface inclined at an angle of the order
surface of the bedplate segment 105, and the leading edge
FIGS. 9-10 show another rotor construction in ac
mounting of the bedplate segments 40, in the same loca
tion as the gasket 43. A spacing of the order of .010 25 cordance with the invention, and they also illustrate the
mounting of the rotor and bedplate on the side wall
inch between the surfaces 70 and the areas 45 has pro
on a pulp tub, such for example as the tub disclosed in
vided satisfactory results in practice, and adjustment of
Stark Patent 2,696,766 issued December 14, 1954, to the
such spacing as may prove desirable for different mate
same assignee as this application. Thus in FIGS. 9 and
rials may be effected by varying the shim arrangement as
10, the rotor 100 is mounted on a shaft 101 extending
described.
horizontally through the side wall 102 of the tub. The
The leading edge surface 72 of each vane 60 is essen
bedplate segments 105 have grooves 106 and ribs 107
tially ?at in vertical section and of substantial area, ex
forming their working surfaces, and they are mounted
tending along the vane inwardly to the ?ange 61. In
on a support plate 108 which may be secured in any
addition, this leading edge surface 72 is arranged to in
cline toward the working surface of the bedplate so 35 suitable way to the tub wall 102.
The body 110 of the rotor 100 carries a plurality of
that as the vane rotates with the rotor, the surface 72
vanes 111 which are of somewhat curved shape as best
will not only produce a pumping action urging the stock
seen in FIG. 11 but otherwise operate in the same manner
tangentially outwardly, but it will force the stock down
as the vanes 60. Thus the vane includes an undersur
wardly toward the working surface of the bedplate. Sat
isfactory results from this standpoint have been obtained 40 face 112 which moves in close parallel clearance to the
of 5° as shown.
The trailing end portion 73 of the
surface 115 of each vane 111 is inclined forwardly to
ward the surface of the bedplate at a substantial angle,
satisfactory results having been obtained with this sur
the surface of the bedplate in response to rotation of the 45 face arranged to de?ne an angle of the order of 10° as
shown. The underside 116 of the trailing edge of each
vane.
vane 111 is curved away from the surface of the bed
With this construction of the rotor and vanes as just
plate to produce a lifting action as already described by
described, it will be seen that the vanes 60 are essentially
the vane 60.
the only elements having a pumping action on the
The vanes 111 may be secured to the rotor body 110
stock. Since the upper surface of the rotor provided by
by welding or other suitable means, and it will be seen
the cap 65 is essentially smooth and does not include the
that they form the only pumping elements on the rotor.
up-standing vanes which have been conventionally used
This rotor construction accordingly operates similarly
in apparatus of this general character as shown, for ex
to the rotor 20 as already described, and it has been
ample, in the above Martindale patent. As a result,
found particularly desirable for installations where in
instead of having the stock lifted away from the bedplate
creased circulation of the stock in the tub is desired, while
as would be the tendency if the rotor included pumping
the straight vane construction of FIGS. l-S appears to
vanes, the pumping action on the stock is maintained in
give somewhat decreased circulation but even better de
close proximity to the bedplate, and the desired rubbing
?bering action than the curved vane construction of
action of the stock on the bedplate is enhanced by the
FIG. 9.
>
forwardly inclined edge surfaces 72 of the vanes as
While the forms of apparatus herein described con
described.
stitute preferred embodiments of the invention, it is to
The combination shown in FIGS. 1-5 is subject to
be understood that the invention is not limited to these
modification within the scope of the invention. For ex—
precise forms of apparatus, and that changes may be
ample, it may be desired in some installations to eliminate
the extractor plate 25 and to carry out extraction of the 65 made therein without departing from the scope of the
invention which is de?ned in the appended claims.
pulped stock through the bedplate itself. FIG. 6 shows
What is claimed is:
a bedplate suitable for such installation, and it includes
1. In pulping apparatus of the character described for
an annular frame 80 provided with a perforate inter
liquid slurry stock including a tub for receiving a quantity
mediate annular section 81. A plurality of bars 82 over
of stock and a bedplate mounted in a wall of the tub
lie the annular surface 81 and are welded or otherwise
and having an annular working surface composed of
secured to the frame 80. This unit 80-82 can be mounted
spaced smooth areas having grooves therebetween pro~
in the wall of a tub similarly to the arrangement in FIG.
viding edges on said smooth areas, the combination of a
2 with the unit 80-82 taking the place of the parts
rotor including a body mounted for rotation concentri
40-42 in FIG. 2, and the only other modi?cation necesf
cally of said bedplate, a plurality of vanes on said rotor
sary would be to complete the enclosure of the space im~
vane curves upwardly from the area 70 as shown in
FIG. 5 to exert a lifting action on the stock away from
3,073,535
body projecting outwardly therefrom in overhanging rela—
tion with a substantial portion of said bedplate, means
maintaining each said vanes spaced a predetermined rel
atively small distance from the plane de?ned by said
smooth areas of said working surface to de?ne a stock
working space therebetween, means for rotating said rotor
in the direction to cause said vanes to produce discharge
(i
said leading edge surface on each of said vanes being
arranged to incline toward said working surface and
de?ning an angle less than 90° as measured between said
plane and said leading edge surface of each said vane for
forcing the stock between said working surface and said
under surface portion of said vane in response to rotation
of said rotor, said vane including an under surface portion
of the stock outwardly of said bedplate, means forming
trailing the ?rst named said portion thereof and arranged
a leading edge surface along a substantial portion of
to diverge from said bedplate and thereby to exert a lift
each of said vanes which is inclined towards the plane 10 ing action on the stock away from said bedplate, and
of said working surface to de?ne an angle of less than
said leading surface of each said vane cooperating with
90° as measured between said plane and said leading
said bedplate to produce a predominately rubbing action
edge surface of each said vane for forcing the stock
on the pulp between the vanes and the bedplate while
towards said working surface of said bedplate and into
creating hydraulic pressure and turbulence operative to
said working area in response to rotation of said rotor, 15 provide highly effective pulping and de?bering with a
and said leading edge of each said vane cooperating with
minimum of cutting action on the pulp.
said bedplate to produce a predominately rubbing action
4. In pulping apparatus of the character described for
on the stock between the vanes and the bed plate while
liquid slurry stock including a tub for receiving a quantity
creating hydraulic pressure and turbulence operative to
of stock and a bedplate mounted in a wall of the tub and
provide highly effective pulping and de?bering with a 20
minimum of cutting action on the solid matter in the
stock.
2. In pulping apparatus of the character described for‘
liquid slurry stock including a tub for receiving a quantity
of stock and a bedplate mounted in a wall of the tub and 25
having an annular working surface composed of spaced
smooth areas having grooves therebetween providing edges
on said smooth areas, the combination of a rotor including
a body mounted for rotation concentrically of said bed—
plate, a plurality of vanes on said rotor body projecting
outwardly therefrom in overhanging relation with said
having an annular working surface composed of spaced
smooth areas having grooves therebetween' providing
determined relatively small distance from the plane de?ned
edges on said smooth areas, the combination of a rotor in~
by said smooth areas of said working surface to de?ne a
bedplate, means maintaining each said vane spaced a pre
cluding a body mounted for rotation concentrically of said
stock working space therebetween, each of said vanes
bedplate, a pluarlity of vanes on said rotor body project 30 having a flat leading edge surface of substantial width in
ing outwardly therefrom in overhanging relation with a
the direction intersecting said working surface, means for
substantial portion of said bedplate, means maintaining
rotating said rotor in the direction to cause said leading
each said vane spaced a predetermined relatively small
edge surface of said vanes to produce discharge of the
distance from the plane de?ned by said smooth areas of
stock outwardly of said bedplate, said rotor having a sub
said working surface to de?ne a stock working space
stantially smooth surface radially inwardly of said vanes
therebetween, means for rotating said rotor in the di
and being substantially free of portions projecting axially
rection to cause said vanes to produce discharge of the
outwardly thereof to con?ne the pumping action thereof
stock outwardly of said bedplate, each of said vanes hav
to said leading edge surfaces of said vanes, said leading
ing an under surface portion of substantial area ar~
edge surface on each of said vanes being arranged to
ranged in parallel and closely space relation with said 40 incline towards said working surface and de?ning an angle
Working surface of said bedplate, each of said vanes
less than 90° as measured between said plane and said
having a leading edge surface intersecting said under
surface portion and arranged in inclined relation toward
leading edge surface of each said vane thereby to force the
stock towards said working surface and into said working
said bedplate to de?ne an angle less 90° as measured be
tween said plane and said leading edge surface of each
said vane for forcing the stock towards said working sur
area in response to rotation of said rotor, and said lead
ing surface of each said vane cooperating with said bed
plate to produce a predominately rubbing action on the
face of said bedplate and into said working area in re
sponse to rotation of said rotor, and said leading edge
surface of each said vane cooperating with said bedplate‘
to produce a predominately rubbing action on the pulp 50
pulp between the vanes and the bedplate while creating
hydraulic pressure and turbulence operative to provide
highly effective pulping and de?bering with a minimum of
cutting action on the pulp.
between the vanes and the bedplate while creating hy
' 5. A rotor assembly for use in pulping apparatus of the
draulic pressure and turbulence operative to provide
character described for liquid slurry stock including a tub
highly effective pulping and de?bering with a minimum of
for receiving a quantity of stock and a'bedplate mounted
cutting action on the pulp.
in a wall of the tub and having a working surface, com
3. In pulping apparatus of the character described for 55 prising a rotor body adapted to be mounted for rotation
liquid slurry stock including a tub for receiving a quantity
concentricallyvof the bedplate, a plurality of vanes on
of stock and a bedplate mounted in a Wall of the tub and
said rotor body projecting outwardly therefrom in angu
having an annular working surface composed of spaced
larly spaced relation, each of said vanes having an under
smooth areas having grooves therebetween providing edges
surface portion of substantial area de?ning a plane extend
on said smooth areas, the combination of a rotor includ 60 ing radially of the central axis of said body, means form
ing a body mounted for rotation concentrically of said
ing a leading edge surface of substantial area on each of
bedplate, a plurality of vanes on said rotor body projecting
said vanes, and each said leading edge surface being
outwardly therefrom in overhanging relation with a sub
arranged in inclined relation toward said plane and de?n
stantial portion of said bedplate, each of said vanes hav
ing therewith an angle less than 90° as measured directly
ing an under surface of substantial area including a portion
between said plane and said surface to force the stock
arranged in parallel and closely spaced relation with said
toward said plane and to urge said vanes away from said
working surface of said bedplate, each of said vanes
plane in response to rotation of said rotor. '
having a leading edge surface of substantial width in the
6. A rotor assembly for use in pulping apparatus of the
direction intersecting said working surface, means main
character described for liquid slurry stock including a tub
taining each said vane spaced a predetermined relatively
for receiving a quantity of stock and a bedplate mounted
small distance from the plane de?ned by said smooth areas
of said working surface to de?ne a stock working space
therebetween, means for rotating said rotor inthe direc
tion to cause said leading edgevsurface of said vanes to
in a wall of the tub and having a working surface, com
prising a rotor body adapted to be mounted for rotation
concentrically of the bedplate, a plurality of vanes on said
rotor body projecting outwardly from the periphery there
produce discharge of the stock outwardly of said bedplate, 75 of in angularly spaced relation, each of said vanes having
memes
r‘)
an under surface of substantial area de?ning a plane
extending radially of said body, means forming a leading
edge surface of substantial area on each of said vanes
which is inclined at an angle of less than 93° toward said
plane and which intersects said under surface of said vane 5
at an angle correspondingly greater than 90° to force
the stock toward said plane and to urge said vanes away
from said plane in response to rotation of said rotor, and
the upper surface of said vanes and said body being sub
3.
References {Iited in the ?le of this patent
UNITED STATES PATENTS
1,804,966
2,351,492
2,371,837
2,654,294
2,703,533
2,824,702
stantially smooth to con?ne the pumping action of said 10 2,858,990
rotor assembly to said leading edge surfaces of said vanes.
Valentine ____________ __ May 12, 1931
Cowles ____; __________ __ June 13, 1944
Martindale ___________ __ Mar. 20, 1945
Morden _______________ __ Oct. 6,
Cowles _______________ __ Mar. 8,
Lee _________________ __ Feb. 25,
Honeyman ____________ __ Nov. 4,
1953
1955
1958
1958
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