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Патент USA US3060871

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Oct. 30, 1962
Filed Jan. 26, 1959
7 Sheets-Sheet 1
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7 Sheets-Sheet '7
Patented Get. 36, 1962
housing’s inner circumference, then it will be found better
for these grooves to be provided not directly on the cir
cumference of the pump housing itself but in a special
Georg Neidl, Uferstrasse 6, Berlin 21), Germany
Filed Jan. 26, 1959, Ser. No. 789,111
Claims priority, application Germany May 30, 1958
2 Claims. (Cl. 193—103)
bushing which is pushed into the pump housing. Ac
cording to the invention, it is an eminently practical
measure, for reasons of simpli?ed assembly, to design
the bushing—looked at in an axial direction-in several
The invention is in respect of a further development
of the subject of application No. 637,230 now ma
tured into Patent No. 2,956,503. In [the main patent,
a rotary pump is described, the impeller of which, inter
alia, is designed as an elliptical or circular disc which is
mounted obliquely to the pump axis.
According to the present invention, where the impeller
is constructed as a disc, the latter has to be secured
obliquely on the pump shaft in such a way that, when
the impeller is rotating, the edges of the impeller disc’s
working surface facing towards the suction intake de
parts, the advantage of this being that the grooved bush
ing can be ?tted and removed without there being any
necessity, at the same time, to remove the pump im
peller from its overhung bearings. ‘It may be found
appropriate, at one point, especially in the region ap
proaching the opening to the pressure outlet, to keep the
housing’s walling free of any bushing segment. Now,
in order to keep the remaining bushing segments inside
the housing, there is inserted, in the region approaching
the opening to the pressure outlet, a ring segment whose
purpose is to maintain the clearance at the front end of
the pump housing between the free-laying edges of the
scribe a circle, the diameter of which corresponds to the
mouth of .the intake pipe where it connects with the pump 20 bushing segments.
For the purpose of increasing the crushing effect it
housing. When actually making the disc-shaped im
may be of advantage, apart from the circumferential
peller, it is possible to take ‘a circular disc to start with
grooves running in a peripheral direction on the pump
and remove from same, at diametrically opposite points,
housing, to ?t additional grooves or slots which cross
crescent-shaped segments.
In order to promote a better suction in the material 25 the circumferential grooves or which run spirally, these
grooves being variously pro?led, presenting, more espe
which is to be moved, it is a good thing, particularly when
cially, triangular pro?les.
the material is viscous, to select the pump intake so large
In order to render uniform the crushing action occur
that its internal diameter corresponds substantially to
ring inside the pump during the actual pumping, it is of
the internal diameter of the pump housing. It is pos
sible, by cutting out the intake pipe altogether, to con 30 advantage to ?t in the large opening in the pump hous
ing’s cylinder Walling leading to the pressure outlet, an
nect the pump housing, on the latter’s intake side, di
insert having holes arranged over its surface, this insent
rectly on to a correspondingly large opening in the wall
being not only curved according to the inner curvature
of the tank on which it is to be used.
of the housing, but in addition, having circumferential
It is further possible to shorten the pump housing in
an axial direction in such a manner that the pump im
grooves in the same manner as the remainder of the pump
peller projects partially out of the housing. Where this
housing’s inner surfaces.
is the case, it is advisable for the housing to be mounted
This ensures that the pump
impeller’s prongs and teeth which continuously brush past
the insert, clear away any foreign bodies from the holes
arrangement has proved itself to be successful especially
in the insert, until such time as these foreign bodies have
for shifting prepared mortar or cement, no matter whether
the latter be in a container, cement pit, or a trough, or
whether it be a question of conveying away, in the man
ner of a suction dredger operating in waterways, wet sand
from the bottom of the water. By means of that part
been broken up to the extent that they are able to pass
through the holes in the insert and make their way on
to the pressure outlet. Instead of these holes, there can
of the rotary pump which projects from the housing the
water in the immediate vicinity of the pump impeller is
whirled up violently and so the wet sand, mixed with the
water, is drawn in through the rotary pump and passed
a width and spacing-apart from each other such as match
in such a Way that the pump shaft runs vertically.
be provided in the pump housing’s insert, towards the
pressure outlet, slits lying parallel to each other and of
the breaking-up action desired. This slitted insert is
especially suitable as a chopping mechanism in the beet
For the purpose of further adaptation to the desired
on into the pressure outlet. This pump simultaneously
performs, to a certain extent, the function of the pressure 50 dimensions of the material which has to be chopped up,
the outer diameter of the rotary member can be matched
cumsuction pump in a customary suction dredger. For
to the pump housing’s inner diameter, the clearance be
the purpose of increasing the output it is possible to pro
tween the pump impeller’s outermost circumference and
vide, at diametrically opposite points in the pump housing,
pressure outlets which, ‘by means of appropriate bent
the pump housing’s inner circumference being matched
With pumps whose disc-shaped impellers project partly
siderably towards the bottom, the inlet opening into the
pressure outlet also being widened by bellying out the
housing’s walling at this point. It is also possible for
pipings, are directed upward and united into a common 55 to the size of the slits to be made.
It may be appropriate to widen the slitted insert con
pressure outlet in the region of the pump shaft.
from the housing, it is of advantage, at the open, front
end of the pump housing starting from the housing’s
cylindrical circumference, to ?t, as permanent ?xtures, 60 cutters to be ?tted into the slits in such a way that the
cutter blades project somewhat beyond the inner’ cir
guide rings or guide pro?les preferably in the form of a
truncated cone, which are executed as one-piece surfaces
or divided up into sections. The pump discs can be
convex, concave, or bent over in two directions.
It is
curnference of the insert or inner circumference of the
pump housing, into the interior of the housing, though,
obviously, the diameter of the pump impeller will then
also possible to ?t, on the circumference of the disc— 65 have to be smaller than the pump housing’s inner di
ameter. The cutters can also be constructed as double
shaped pump impeller, an annular shoe surface which is
preferably given a shape like that of a section of cylindri
With a view to enabling the rotary pump to be used
cal casing in such a way that the shoe-ring’s outer sur
in the chemical industry, particularly ‘for the job of shift
face lies parallel to the pump housing’s inner casing.
If, on the circumference of the disc-shaped pump im 70 ing viscous substances such as, more especially, arti?cial
silk spinning solutions, it is appropriate to connect both
peller, teeth, prongs, or projections are provided which
the suction intake as Well as the pressure outlet, in the
engage in correspondingly shaped grooves on the pump
bottom region, to the pump housing, the extension of
FIGURE 16 is a front-end view of a rotary pump in
which two segments of the housing’s bushing have been
i the pressure outlet axes coinciding with each other.
Finally, it is possible to construct the pump impeller in
?tted into place,
FIGURE 17 is an axial section through a rotary pump
such a way that those points or lines or surfaces of the
pump impeller which rotate concentrically to the’ inner
with circumferential groovesrand longitudinal slots,
walls of the housing, are vaulted ‘to the rear in the
FIGURE 18 is a cross section through the pump in
accordance with the line XVIII—t-XVIII of FIGURE 17,
FIGURE 19 is a plan view of a perforated insert for
marginal regions contrary torthe shaft’s direction of rota
tion. The effect of this is to prevent, to a large extent,
the pump housing as per FIGURE 17,
the eddyings which would otherwise occur in the liquid
being pumped inside {the pump housing by reason of the 10
FIGURE 20 is a cross' section similar to that of FIG
sharp edges of the impeller, and the pump’s efficiency is
thus appreciably increased.
The curvatures in the pump impeller’s marginal zones
are produced by transmitting to the pump impeller itself
URE 18 through a pump'with perforated insert ?tted,
FIGURE 21 is a partially enlarged axial section through
the pump at the point where the perforated insert is
?tted, corresponding to the line XX-I-JQH of FIGURE
or a model of same, on a machine tool, rotary motions 15
corresponding to the actual pump operation, a forming
or pressing7 tool being shoved forward step by step, slide
fashion, vertically to the machine’s direction of rotation.
FIGURE 22 is a radial section through a rotary pump
with enlarged opening to the pressure, outlet,
FIGURE 23 is an insertr?tted with slits, for the opening
The tool is clamped'in a holder and it is moved along
‘giving access to the pressure outlet, corresponding to the
those longitudinal lines past the pump impeller, which 20 form of execution of FIGURE 20,
correspond to the longitudinal lines of the housing, these
FIGURE 24 is a radial section through arotary pump
longitudinal lines being so ?xed that, after the pump
with suction intake and pressure outlet arranged in the
impeller has been ?nished, when it rotates in its own
bottom part of the housing,
housing as against this housing, concentric play remains
FIGURE 25 is an axial section through the pump
or the pump impeller runs in the housing vfree of play. 25 along the line XXV-XXV of FIGURE 24,
FIGURE 26 is a side view of a disc-shaped pump im
It is also possible, after the pump impeller has been given
its edge curvature, to cut grooves into the curvatures '
peller ?tted onra shaft,
using a pro?led cutting tool, the pro?led tool being ad
vanced intermittently during the turning operation on the
in FIGURE 26, in, the direction of the arrow C,
FIGURE 27 is a plan view of the component as shown
lathe. ' Corresponding grooves may' also be provided on 30
the inner surface of the housing, into which the promi
nences on the pump impeller’s circumference engage.
FIGURE 28 'is a cross', section through the pump
impeller disc corresponding to the line XXVIII—XXVIII
of FIGURE 27, after diametrically opposite edge portions
The invention will now be further described with refer-7
have been curved over, _
ence to the accompanying drawings in which:
FIGURE 29 is an axial section through a pump hous
FIGURE 1 is an axial section through a rotary pump 35 ing ?tted with a pump impeller designed in accordance
in which the disc-shaped pump impeller has been pro
duced from a circular disc by cutting off crescent-shaped
I with FIGURE 28,
FIGURE 30is a mean cross section through a pump
impeller into which teeth have been worked,
FIGURE 2 is a plan view of the pump disc in accord
FIGURE 31 is a mean cross section through a pump
ance with, the invention, in the direction of the arrow B 40 impeller in‘which the undercuts of'the curvatures duly
of FIGURE 1,
produced have been ?lled in with material, and
FIGURE 3 is a rotary pump such as described in the
older patent, with which eddy formations may beset
FIGURE 32 is a ground plan of a pumping installa
tion with three pumps connected up one behind the
up underneath the suction-intake pipe,
FIGURE 4 is an axial section through a rotary pump
In FIGURES 1 and 2 issketched in, in dot-and-dash '
lines, a rotary pump such as is the subject of the older
with a large suction-intake pipe,
FIGURE 5 is a crossisection through a rotary pump
which is directly connected up to the walling of a tank,
patent, the pump impeller '2 being of a circular shaped
construction in' the direction of-the projection B. The
pump disc 3 of the present iinyention is provided with
, FIGURE 6 is an axial section through a pump which
is mounted vertically inside a tank,
50 front and rear faces 3a and 3b,,r'espectively, and rear face
FIGURE 7 is a pump of similar constructional type
to that shown in FIGURE 4 but which is open at both
3b is mounted on shaft 1' obliquely to the longitudinal axis
of the shaft. jThe disc 3 is producedrby cutting off or
front ends,
removing crescent-shaped segments 2a of the circular im
peller 2, as is clearly apparent in FIGURE 2'. These re
moved crescent-shaped segments are located at'diametri
FIGURE 8 is a cross section, through the equipment
corresponding to the line VIII—VIII of FIGURE 7,
FIGURE'9 is a pump similar to that 'as shown in
cally opposite points and provide edges located closer to
FIGURE _7, in which the pump shaft is mounted in the a
the axis of the shaft l-than the edges which correspond to
side wallings of a tank inside which the pump is ?tted,
FIGURE 10 is an axial section through a pump in
which there is a guide ring ?tted on the open end of the’
the full diameter of the circular disc. . The closer edges
are located at a distance from the axis of the shaft 1
housing, 7
which is smaller than one-half of the diameter of'the
FIGURE 11 is a ,form of execution similar to that
In a corresponding'fashion, housing '1 of the present
shown in FIGURE 10, in which however, the" pump, disc
invention is provided by ,narrowing‘such housing from
is executed in, an elliptical shape,
that identi?ed by the broken lines 4 in FIGURE 1.
FIGURE 12 is a side elevation view of the pump as 65 : ' When‘shaft I is rotated, it is apparent that disc 3 will
represented in FIGUREll, in the direction of the arrow
U, and in vwhich the pump disc is'represented in dot-and
dash lines,
likewise be rotated and edge, K4 of ,the front face of the
disc facing suction intake 5‘ will describe a circle corre
sponding to the innner diameter of the intake or' inlet 5.
By virtue of this particular arrangement, there is elimi
FIGURES 13 is an axial section through a pump with
70 nated a dead space, so thatrthe materialentering the
FIGURE 14 is an axial section through a pump hav- 7
inlet 5 in the direction of the, arrow A impinges directly
a ing' a pump-impeller disc, the cross section of which is
on therfront; face 3a of the disc lifThis eliminates eddy
concavely curved pump disc,
' '
Iing, and the materialis gently guided upwards along the
curved in the shape of an S,
, FIGURE 15 is‘ an axial section through a rotary pum
in which the impeller is ?tted with a shoe,
front face of the disc to pressure outlet pipe, as indicated
by dotted lines B.
Furthermore, it will be noted that the peripheral edge
of the disc 3 directed towards the inlet 5 is angled to
wards the axis of the shaft 1, so that the edge rotates ap
proximately over the circle vformed by the inner diameter
of the inlet 5.
By way of contrast, FIGURE 3 shows a rotary pump
in which the edge K5 facing the suction intake describes,
when it rotates, a circle which is ‘larger than the trans
verse cross section of the suction intake 5. The effect of
this is that eddying occurs between the edge K5 in its
lowermost position and the suction pipe cover, when the
liquid is being drawn in.
According to the form of execution as shown in FIG
URE , the pump shaft 9', being a double-mounted
shaft, is carried in bearings 37 and 38 in the wallings of
the tank 36. This form of execution may be concerned
With nothing more than an ordinary mixing tank if the
pressure outlet 35, as shown in dotted, arrow-headed
lines, is so constructed that it branches off fork-wise so
that the liquid is continuously directed back into the
In the form of execution as depicted in FIGURE 10,
the pump impeller also projects partially outside the
pump housing, the mid-point M1 of the pump disc R,
According to the form of execution as shown in FIG
UR-E 4, there is no cover-plate ?tted on the suction end
which serves simultaneously as the point at which the
disc is fastened to the pump shaft, being advanced to
wards the open end 41 of the pump housing by a cer
of the housing 5 but instead, a piece of piping 2' the
diameter 3' of which corresponds to the diameter 4' of
tain distance 46, as against the mid-point M of the hous
the pump housing 1’. Since this pump does not conse
quently present on its suction end, any narrowing due to
In order not to discontinue the pump housing 1’ un
ing 1'.
duly abruptly as against the tank, and to prevent any
the presence of a suction-intake pipe, the pump impeller
need not have the special shape which has been referred
pro?les running the whole way round, or split up be
to in connection with FIGURES 1 and 2 since there are no
tween themselves over the circumference, are provided
chopping during the suction ‘action, guide rings or guide
for ?tting, as stationary ?xtures, on the open end of
the pump housing.
consequently, no eddyings are set up either. Connected
According to the form of execution which is depicted
on to the piece of piping 2’ there can be a pipe elbow 25
in FIGURES 11 and 12, the pump disc is designed as
5', the diameter 6' of which corresponds to the diameter
dead spaces along the pump impeller’s lower edge and,
an ellipse. Its point of attachment M1 to the shaft 1
3’ of the piece of piping 2'. By constructing the .pump
is shifted, as against the housing’s mid-point M, to
in this fashion, a perfect pumping action is obtained even
wards the intake end. It is appropriate for the elliptical
when shifting viscous substances.
It is possible, in accordance with FIGURE 5, to join 30 arcs E to be cut o? along a chord S running parallel to
the cover plate A of the pump housing 1’, and to pro
the pump housing 10' by its ?ange 11’ direct to the wall
vide for the pump disc to be mounted inside the housing
of a tank 13' so that the ‘liquid in the tank 13' is con
in such a Way that the edge S rotates with little or no
veyed direct through the pump housing by means of the
clearance as against the cover plate A of the pump hous
pump impeller 15’ into the pressure outlet 14'. While
the liquid is being drawn in, there is set up, inside the 35 ing. vIn FIGURE 11, represented in dotted lines, is an
tank 13’, a conical eddy 18'. In order, particularly when
moving liquids with ?brous materials in them, to prevent
elevation on the ‘pump disc in the direction of the arrow
Q. In a modi?ed arrangement of this form of execu
tion, the housing—-as drawn in dot-and-dash lines in
any deleterious matting together or streamer formation
FIGURE 1l-—may be extended up to the front edge T
as it is called, it is a useful practice to ?t a partition wall
so that, in this instance, the pump disc does not project
19' in the tank in such a way that this partition wall
outside the pump housing.
passes through the centre axis of the liquid’s cone-shaped
If the pump disc is executed in such a manner that the
eddy 18’.
elliptical arcs E plotted in dotted lines in FIGURE 11
In the form of execution as represented in FIGURE
become arcs of a circle or show an arc shape correspond
6 the rotary pump 29 is suspended in a tank 21 from
45 ing to the form of execution as per FIGURES l and 2
above in such a way that the pump shaft 22 hangs verti
which is obtained by cutting off crescent shaped portions
cally. In addition, the housing 23 of this pump is short
‘at two diametrically opposite places, then the gaps be
ened in an axial direction in such a way that the pump
tween the individual points in the arcs E and the por
disc 24 projects downwards out of the front end 25 of
tions of the housing l”s walling pertaining to same will
the pump housing. The drive motor 26 is constructed as 50 be of differing size.
a waterproof sealed underwater motor 50 that the com
According to the form of execution as shown in FIG
plete pump unit can be lowered into a shaft in the man
URE 13, the pump disc R is executed in a curved shape
ner of a drainage pump.
It is a useful measure, for
in the axial section in such a Way that it appears convex
reasons of improved efficiency and spread of the weight
as against the pump shaft 1. In the form of execution
load, to provide on diametrically opposite portions of the 55 as per FIGURE 14, a pump disc 43 is provided for
pump housing’s walling, one pressure outlet 27 each
which is executed in a curved shape bent over in two
directions and thus, in axial section, it has the appear
which, via a pipe elbow 28 in each case, directs the
ance of a question mark. The pump disc’s edge 4-6
liquid which has been drawn in, to a common pressure
facing the cover plate 44 of the suction intake 45 is cut
outlet 29 arranged coaxially to the shaft 22. In order to
suction sand or like substance away, the pump is lowered 60 off along a chord S as can be seen in the dot-and-dash
representation above the pump housing. It is also pos
so that the impeller, which projects from the pump hous
sible to cut off the pump disc according to another form
ing, stirs up the sand as it rotates quickly, and mixing the
of execution—plotted in dotted lines in FIGURE l4-—
sand with the water located above same, draws in the
along a chord S’ lying opposite the chord S. In fact,
mixture and passes it along to the pressure outlet 2%.
In the form of execution as shown in FIGURES 7 65 various forms of execution are possible, involving seg
ments either on only the one or only the other side, or
and 8, not only is the left-hand cover plate omitted but
on both sides, along chords taken to the pump disc.
also the right-hand cover plate 8' (cf. FIGURE 4) and
According to the form of execution as depicted in
substituted by a cover plate with ribs 3-1 carrying the
FIGURE 15, there is ?tted permanently on the circum
bearing 32. for the shaft 9'. The ribbed cover plate is
ference of a disc-shaped pump impeller 47 a shoe surface
?ange-?tted to the housing 1'. When such a pump as 70
49 rotating axially with the shaft axis 48, which is formed
this is placed in a tank 33 out of which the shaft 9' passes,
from a ring-shaped flat iron which one may imagine as
via a stu?ing box 34, to the motor-—not depicted-then
having been cut from a cylinder, in that two parallel
the pump will deliver via its pressure outlet 35, drawing
surfaces of out are arranged running not only parallel
in the material from the tank 33 from the left and right
hand sides simultaneously.
75 to each other but also parallel to the surface of the
and 25, both the suction-intake pipe well as the pres
pump disc. The effect of this is that this shoe-ring ro
tates around the inner circumference of the pump housing
1’ practically without'clearance thereby ensuring a par
ticularly good seal on'accou'nt of its width.
‘In the form of execution as given in FIGURE 16,
sure outlet pipe 76 are connectedfup tangentially to the
pump housing 1’ in the latter’s bottom portion in such a
Way that the lowermost, inner generatrix 77 or 78 as the
case may be, connects tangentially with the inner super
there is pushed into the pump housing 1' a bushing con
?cies 79.
sisting of three parts 59, 51, and 52. The ?tting of this
multi~piece bushing into the housing is effected by turn
ed particularly Well.
ing the pump disc 53 in such a way that one of the bush
FIGURES 26 to 29, an elliptical disc 80 is taken as a
In this manner, viscous substances can be shift
According to the form of. execution as represented in
ing segments 5% is pushed’ so far into the housing until 10 basic component, which is securely attached to the shaft
the ?ange on this segment lies ?ush against the front
81. The shaft is clamped in a three-jaw chuck 82 of a
end of the housing 1'. Then, the pump disc 53 is turned
lathe, and a pro?led iron 83 is clampedrin the tool rest,
round to the right by about 90° so that its teeth 55 on
the former being moved back and, forth, in the direction
one side engage in the grooves in the pushed-in bushing
of the double-arrow 84, over the rotating disc. 80. The
. segment 50. Then the second segment 51 is pushed into 15 pro?led iron is ?rst of all moved back and forth along
the housing 1' and the pump disc is'turned further so that
the disc at some distance from the small axis 85 and then
the teeth of the pump disc engage in the grooves of this
pushed forward graduallyin the direction of the arrow
second segment ‘51. Nextfthe third segment 52 is
86 by means of the tool rest. The result of all this is
pushed into the housing. Finally, a ring-shaped segment
that the two diametrically opposite edges which are in
56 is inserted in the recess 54, thus ensuring that the in 20 the immediate vicinity of the pro?led iron 83, are grad
dividual bushing segments 50, 51, and 52 are ?rmly se
ually bent over to the rear, the pro?led iron being fed
cured in their places.
forward only as far as the radius 87. vIn this manner, the
; According to the form of execution as depicted in
lines of demarcation 88, 89 are produced‘. The edges of
FIGURES 17 and 18, the disc-shaped pump impeller
bend 9t}, ‘91 are clearly visible in FIGURE 28, and, in
57 has, on its circumference, teeth 58 which engage in 25 FIGURE 29 the pump impeller can be seen fitted in a
circumferential grooves 59 along the inner circumference
corresponding pump-housing with a radius 87 approxi
' of the pump’s housing. Transversely to these circumfer
ential grooves 59 the inner circumference of the pump
mately. This ?gure only shows the one edge of bend
housing has lengthwise slots ‘60 running parallel to 'the
housing’s axis, of triangular, or_ other shaped pro?le,
99. ‘It can also be seen that the pump impeller rotates
in the housing with a clearance S, and this over the en
tire length of the pump housing.
which cross with the circumferential grooves 59.
It is a useful practice, in accordance withthe'rform of
If the pump impeller is intended to be madeof a thick
walled disc, the edges of bend will ?rst of all be produced
execution as shown in FIGURES 17 to 21, to insert in
the opening 61 of the pump housing '1" which leads to
modelling material such asrlead forexample, and the
on a full-size model made, of some soft, easily workable,
the pressure outlet 62,21 perforated insert 63 provided 35 model is then duly used as a master pattern'for the pro
with holes 64 evenly distributed over its surface. The
duction models, Whether it is ?rst cast in plaster and then
perforated insert ‘63, acting as a strainer, is curved corre
' subsequently. made in some other material, or whether
sponding to the curvature of the inner. circumference of
wooden patterns are made from this modelrand then,
the pump housing 1' and equipped on its inner surface
subsequently, castings are made thereof; FIGURE 30
with slots 65 which correspond to the circumferential 40 represents a cross section through the pump .disc corre
grooves 59 of the pump housing 1'. ‘It is of advantage
sponding to FIGURE 28, the connection to the pump shaft
to provide holes 64 in the bottom of these slots 65. The
being imagined as being not present. In this pump disc,
‘grooves or slots 92 have been cut into the bent-over edges
.holes may be circular, elliptical, rectangular, or of any
other shape. The periphery of the holes can be of wavy,
99, 91, by means of a cutting or lathe tool. The promi
nences thus produced between the grooves are made to
spiral, screw-threaded, roughened, or barbed contour.
?t into corresponding circumferential grooves in the hous
The object of ?tting the perforated insert 63 is'that all
ing’s inner walling when the impeller is ?tted into the
foreign bodies such as lumps and conglomerates entering
the pump housing 1’ through thesuction intake 66 are no
According to, the form of execution as shown in FIG
longer able to proceed straight away into the pressure
outlet 62, but must, ?rst of all, pass through the holes
64 of the perforated insert 63. However, they cannot
do this until they have been sufficiently broken or crum;
bled up by the pump impeller 57 to enable them to pass
through the holes 64 of the perforated insert 63.
For the purpose of increasing the pumping output and
the slicing effect, the slitted insert 67 is substantially Wide
'ened towards the bottom, as FIGURE 22 shows, the in;
let opening 68 into the pressure-outlet’s pipe 69 being
widened also at the same time by an appropriate bellying
out 79 of the housing’s walling'7'1 at this point. The
effect of this is to stop the squeezing often observed dur
ing the slicing operation. Into the slits ‘67 it is possible,
as FIGURE 22 shows, to ?t cutters 72 which are bent
over, eagle-beak fashion, contrary to the pump i-mpeller’s -‘ 7
direction of rotation, and thereby increase the slicing ac 65
URE 31, the bent edges 90, 91 are undercutrat point 93,
that is to say, they are hollow. Now, in order to prevent
pumped material from accumulating in the undercuts 93,
the latter are ?lled in with some ?ller material.
The form of execution of the pump
shown in 'FIG
URES 16 to.22 has proved its worth inrthe paper indus
try particularly and it is suitable as a substitute for the
edge mills generally employed there for breaking up
pieces of wood, f0I',Vnot only is a saving effected in the
cost of purchasing these expensive edge Ki'nillsQbut, in
addition, there is a considerable saving in the time taken
to reduce the woodipieces down to'wood-?bpre pulp, be
cause the reduction takes place in a fraction of the time
normally required using edge mills. * '
‘Such machines as per the’ invention are suitable for
the disintegration and/or pumping of, materials‘ ‘which
have to be moved and which are not capable of How
tion. Where this ;is the case, the. outer diameter of the
movement in themselves. Once these materials have
' pump impeller‘has to be selected correspondingly smaller,
been brought into the machine however, they are
or grooves must be provided in same, intowhich the cut e , processed by, the latter. Thus, it requires but little imagi
tiers engage. The cutters can ' be ‘interchangeably se
nation to picture the machine’ as per FIGURES 4 ‘and 5,
cured ‘in the slits and, if needs be, they can he construct
ed as double-action: cutters. The insert 73, by way of
a variation on FIGURE 19, and corresponding to FIG
URE 23,'can be provided ‘with slits 74 innstead of holes.
.or 10 and 11 for instance, as being turned over clockwise
by 90", when the pump shaft will then point downwards
and the pump impeller will be driven from underneath.
A funnel is placed’ vertically on the inlet feeding into the
a ; According to the form of execution of the FIGURES 24 75 housing, so that the material being dealt with ‘drops down
said inclined ?at surface being substantially equal
under its own gravity on to the rotating pump impeller
and is then processed by the latter.
Designing the pump as per the invention with a pump
to the diameter of said surface of revolution.
2. A pump for the displacement of sludge and vis
cous liquids comprising:
shaft thus arranged vertically is of particular advantage
a housing having a pumping chamber therein, said
everywhere where commodities have to be shifted which, 5
chamber being provided with a front Wall, a rear
in their ?nal stage have to be in a disintegrated form, such
wall and a peripheral wall, the inner surface of said
as is the case for example with ?sh for making into ?sh
peripheral wall conforming to a generally cylindri
meal, sugar beet, and the like. These commodities which,
cal surface of revolution about an axis, said front
in their initial stage are not capable of ?owing along by
wall being provided with a centrally positioned cir
themselves and which therefore are incapable of being 10
cular intake, said peripheral Wall being provided
suctioned into a pump, will drop into the pump—?tted
with a radial discharge port between said front and
vertically-under their own Weight and, after having
rear walls;
een broken up inside the pump, will be converted to a
pulpy mass having a high moisture content, so that they
are then able to be transmitted through the pressure line 15
on to the place at which they are further processed.
According to the form of execution as shown in FIG
URE 32, it may be found appropriate, Where toothed im
pellers are in use, to connect up in series, two or more
pumps 94, 95, 96, the consecutive pump discs being con
structed with reducing sizes of teeth in such a way that the
?rst pump 94 has the largest teeth and the last pump 96
has the smallest.
All the pumps can be equipped with an in?nitely vari
able gear so as to enable the pump speed necessary in 25
any particular case to be set accurately.
I claim:
1. A pump for the displacement of a sludge and viscous
liquids comprising:
a housing having a pumping chamber therein, said 30
chamber being provided with a front wall, a rear
Wall and a peripheral wall, the inner surface of said
peripheral wall conforming to a generally cylindrical
surface of revolution about an axis, said front wall
being provided with a centrally positioned circular 35
intake, said peripheral wall being provided with a
radial discharge port between said front and rear
a shaft extending axially into said chamber through
said rear wall; and
a generally disk-shaped impeller having a substantially
flat surface facing said intake, said impeller being
secured to said shaft, said flat surface being bounded
by a substantially elliptical periphery, the minor axis
of said inclined flat surface including an acute angle
with said shaft and, on rotation of said impeller
about said shaft, defining a circle substantially equal
to the area of said intake, the major axis of said in
clined ?at surface extending at right angles to said
shaft and being substantially equal to the diameter
of said surface of revolution.
References Cited in the ?le of this patent
Re. 1,380
Kingsland ____________ __ Ian. 6, 1863
iHammes ____________ __ Dec. 17,
Nash _______________ __ Dec. 14,
Swenson _____________ __ Mar. 7,
‘Palm _______________ __ Nov. 14,
Heller _______________ __ Mar. 21,
Williams ____________ __ Dec. 25,
Neidl _______________ __ Oct. 18,
a shaft extending axially into said chamber through
Finland _____________ __
Great Britain _________ __
Austria _____________ __
Australia ____________ ..
inclined to said shaft, said ?at surface being bounded
by a substantially elliptical periphery, one axis of 45
Germany ____________ __ Sept. 5, 1955
said rear Wall; and
a generally disk-shaped impeller having a substantially
?at surface facing said intake, said impeller being
secured to said shaft with said ?at surface in a plane
said inclined ?at surface on rotation of said im
peller about said shaft- de?ning a circlie substantially
equal to the area of said intake, the other axis of
Hoelscher: “Inclined Rotor Pumps,” 4 pages, February
11, 1958.
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