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Патент USA US3091196

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May 23, 1963
w. HOFMEISTER ET AL
3,091,186
PUMPING METHOD AND PUMPS FOR SUSPENSIONS
Filed Sept. 29, 1960
Frill!!!’
31%,;
INVENTORS
3,-§l,l8?
W
.i
Patented May 28, 1963
2
another opening, sealing means located in the other
opening, and movable means, for example a plunger,
3,091,186
PUMPING METHOD AND PUMPS FOR
passing through the chambers and openings and slidably
SUSPENSIONS
Werner Hofmeister, Hamburg-Bahrenteld, Harald Goden
rath, Hamburg-Rahlstedt, and Georg Kindler, Harn
burg-Wandsbek, Germany, assignors to Bran & Luebbe,
Hamburg, Germany
Filed Sept. 29, 1960, Ser. No. 59,403
Claims priority, application Germany Get. 2, 1959
11 Claims. (Cl. 103--204)
The present invention relates to a pumping method
engaging the sealing means. When the movable means
are operated, the suspension is pumped through the pump
chamber, while only the suspension medium is pumped
from the separating chamber through the opening in the
partitioning wall into the pump chamber not only when
the suspension is discharged, but also ‘when the suspen
sion is drawn into the pump chamber. In this manner,
10 the suspension cannot pass into the separating chamber
through the opening in the partitioning wall, and is thus
and to pumps for suspensions, and more parucularly to
a metering pump for dispensing measured amounts or
prevented from contact with the sealing means.
a substance suspended or dispersed in a liquid suspen
sion medium.
Different types of pumps are used for this purpose,
but plunger piston pumps are preferred ‘since they are
extremely reliable and capable of dispensing exactly
measured volumes.
When plunger pumps are used for pumping a suspen
sion, certain dif?culties arise since it cannot be avoided
that solid particles contained in the suspension are de
posited on the sealing means which have to be provided
Con
sequently, the suspended substance cannot be deposited
volumes of a liquid suspension or dispersion containing
15
on the sealing means and cause damage to the same.
A pump chamber for the suspension medium is advan
tageously provided from which the suspension medium
is pumped into the separation chamber.
In one embodiment of the present invention, the sec
20 ond pump chamber for the suspension medium is located
in the same pump housing in which the ?rst pump cham
ber for the suspension is located. In this arrangement,
a common plunger member is advantageously used for
pumping both the suspension and the suspension medium.
between the pump housing and the reciprocating plunger. 25 In another embodiment of the present invention, the
When such solid particles are continuously deposited on
the sealing means and carried by the plunger to the seal
ing surface of the sealing means, not only the sealing
means are damaged, but also the sealed plunger surface
second pump chamber for the suspension medium is pro
method which is particularly suited for the pumping of
sion medium for dispersions of synthetic substances.
Since the suspension medium of suspensions with which
the present invention is concerned, does not contain solid
vided in an independent second pump which has its own
plunger. The second pump, and more particularly the
pump chamber therein, is connected by a conduit to the
is mechanically abraded, and damaged. When the seal 30 inlet of the separating chamber of the main pump. In
both embodiments, stepped plungers having portions of
ing means is no longer effective, it is not possible to dis
diiierent diameter are advantageously used.
pense accurately measured volumes by the pump.
Pumps according to the invention are very well suited
It is one object of the present invention to overcome
for pumping Kaolin or milk of lime suspended or dis
this disadvantage of known pumping apparatus, for dis
pensing accurately metered amounts of suspensions and 35 persed in water which serves as suspension medium.
Liquid hydrocarbons are used, for example, as suspen
dispersions, and to provide a pumping apparatus and
suspensions.
Another object of the present invention is to provide
a pump which is constructed in such a manner that the
pumped liquid suspension cannot come into contact with
the sealing means and stu?ing box of the pump.
Another object of the present invention is to provide
a pumping method for separating the pumped suspension
particles, the suspension medium can be in contact with
the sealing means of the pump without causing any dam
age to the same and to the sealed parts.
The novel features which are considered as character
istic for the invention are set forth in particular in the
from the sealing means of the pump by the suspension 45 appended claims. The invention itself, however, both as
to its construction and its method of operation, together
medium of the suspension while small exactly measured
with additional objects and advantages thereof, will be
amounts of the suspension medium are added to the
best understood from the following description of speci?c
embodiments when read in connection with the accom
With these objects in view, the present invention relates
to a method for pumping a liquid suspension containing 50 panying drawings, in which:
FIG. 1 is a longitudinal sectional view illustrating a
a substance suspended in a liquid suspension medium,
pump in accordance with one embodiment of the inven
and also to pumps for pumping the liquid suspension.
tion; and
One method of the present invention comprises the steps
FIG. 2 is a longitudinal sectional view illustrating an
of ‘operating a pump member, for example a plunger,
in a pump chamber, in a separating chamber having seal 55 other pump arrangement according to the present inven
tion in which two separate pumps are used.
ing means, and in an opening connecting the chambers
Referring now to the drawing, and more particularly
so that a liquid suspension is pumped through the pump
to FIG. 1, a pump casing 1 includes a pump chamber 7
chamber, and pressing during both strokes of the plunger
having an inlet valve 9 and an outlet valve it}. A liquid
only the suspension medium of the suspension'into the
separating chamber and through the opening into the 60 suspension is sucked into the inlet means 9, as indicated
by the arrow A, and is discharged from the outlet means
pump chamber. In this manner, the suspension is pre
10 as indicated by the other arrow. A separating cham
vented from entering the separating chamber whereby
ber
5 is located adjacent pump chamber '7 and communi
contact between the sealing means and the suspended
cates with the same through an opening ~16’ in a partition
substance is prevented.
ing wall 3. Separating chamber 5 has inlet 13 which is
A pump according to the present invention preferably
pumped suspension.
comprises a pump chamber having an inlet and an outlet
connected by conduit 14 to the outlet of a second pump
for a suspension, at separating chamber adjacent the
pump chamber and having an inlet for the admission
of the suspension medium only, a partitioning wall be
tween the pump chamber and the separating chamber,
chamber 6. An inlet valve 11 and an outlet valve 12 are
the separating chamber having another wall formed with
provided in the second pump chamber 6. A liquid suspen
sion medium is admitted through the inlet means 11 as
indicated by the arrow B.
A plunger means is provided in the pump, and includes
3,091,186
3
a ?rst part 4 connected by an articulated connecting rod
41 to a rotary member 42. Plunger part 4 is sealed by
suitable sealing means 20 which are packed by a bushing
'21. The plunger is stepped and has a part 3 of greater
diameter which passes through openings in walls 22, and
through a sealing means'IS located between walls 22 in
an annular recess.
In this manner, chambers 5' and 6
4
ber 7 is made consequently slightly stronger concentrated
than intended, and is diluted by the added suspension
medium to the desired concentration. In the embodiment
of FIG. 1, in which a common plunger is provided for
pumping the suspension and the suspension medium, the
ratio between the suspension and the added suspension
medium remains absolutely constant.
are separated from each other, and can communicate only
The embodiment of FIG. 2 operates on the same prin
through conduit 14. The ‘free end part 2 of the plunger
ciple as the embodiment of FIG. 1. However, two sep—
is again stepped and has a smaller diameter than the 10 arate pumps are provided \for the suspension and for the
thickest plunger part 3, but a greater diameter than plung
suspension medium.
er part 4.
Plunger part 2 passes through opening 16', leaving a
cludes a pump housing 1, a pump chamber 7, inlet means
and outlet means 9 and 10, a separating chamber 5, a
small gap 16 free through which the separating chamber
partitioning Wall 8 with an opening 16’ connecting the
The pump for the suspension in
5 communicates with the pump chamber 7.
15 separating chamber 5 with the pump chamber 7, seal
When the rotary crank member 42 is rotated, and the
ing means 15, and a stepped plunger having two plunger
plunger performs a stroke to the right as viewed in FIG.
portions 2 and 3. Plunger portion 2 de?nes a gap 16 in
1, suspension medium contained in the pump chamber 6
opening 16’. Plunger portion 3 is connected by a con
is pressed out of the outlet means 12 since the diameter of
necting rod 31 to a crank means 32 which is ?xed to a
plunger part 3 is greater than the diameter of plunger 20 worm gear meshing with a worm screw 45.
part 4, and therefore displaces a greater volume. At the
same time, a portion of plunger part 3 is retracted ‘from
the separating chamber 5, so that the free volume in the
separating chamber 5 is increased, and suspension medium
Another
worm gear is secured to a crank means 44 and meshes
with Worm screw 45. A connecting rod 43 connects
crank means 44 with plunger 4a of the pump for the
suspension medium which is provided with a pump cham
is sucked from chamber 6 through conduit 14 into separat 25 ber 6 having inlet means 11 and outlet means 172 com
ing chamber 5.
municating through a conduit 14 with the inlet 13 of the
The diameter of plunger part 2 is greater than the
separating chamber of the other pump.
diameter of plunger part 4uso that a greater volume is dis
Since both crank drives are driven from the same worm
placed trom chamber 6 than is available in separating
screw, the two pumps operate in synchronism. When
chamber 5, so that some of the suspension medium con 30 plunger 2, 3 moves to the left, as viewed in FIG. 2, sus
tained in separating chamber 5 is pressed through the gap
16 into pump chamber 7.
During the stroke of the plunger to the right, the sus
pension is displaced from pump chamber 7 and discharged
through outlet means 10. The larger plunger portion 3
displaces suspension medium from separating chamber 5
pension is sucked into the pump chamber 7 through the
through gap 16 into pump chamber 7 where it is admixed
inlet means 9, and, as explained above, a small amount 35 to the suspension entering at the inlet means 9, as in
of suspension medium enters through the gap 16 and is
admixed to the suspension. Since the suspension medium
?ows from the separating chamber 5 into the pump cham
ber 7, no suspension can ?ow through the gap 16 into
the separating chamber 5 so that the sealing means 15 is
completely separated from the suspension in pump cham
ber 7 and cannot get in contact with the same during the
suction stroke of plunger 2, 3, 4.
During the stroke in the opposite direction, the plunger
portion '2 displaces the suspension from the pump chamber 45
7 through outlet means 10 while inlet valve means 9
closes. At the same time, the larger plunger portion 3
moves further into separating chamber'S so that a part
dicated by the arrow A. At the same time, plunger 41:
moves to the left, and suspension medium is sucked
through inlet means 11 into pump chamber 6, as indicated
by the arrow B. Outlet valve 12 closes and prevents re"
turn of the suspension medium from the separating cham
ber through conduit 14 into the pump chamber 6.
'During the stroke in the opposite direction, plunger 4a
displaces the suspension medium from pump chamber 6,
while inlet valve 11 closes. The suspension medium
passes through outlet valve ;12, conduit 14, and inlet 13
into the separating chamber 5 whose volume is simul
taneously increased since the larger plunger portion-3
moves partly out of separating chamber 5 during this
of the suspension medium therein is displaced and pressed
stroke. However, a greater volume of suspension me
through the gap 16 into the pump chamber 7. Conse 50 dium is ‘discharged from pump chamber 6 than is made
quently, some additional suspension medium is added to
available by the retraction of the larger plunger portion
the suspension in chamber 7', While no suspension can flow
3 from separating chamber 5-, so that an amount of sus
in opposite direction through gap 16 into the separating
pension medium passes through gap 16 into pump cham
chamber 5.
'
ber 7 to be admixed to the suspension entering through
At the same time, the larger plunger portion 3 moves 55 the inlet ‘means 9 in direction of the arrow A.
out of the pump chamber 6 so that suspension medium is
The embodiment illustrated in FIG. 2‘ has the advan
sucked through the inlet means 11 into chamber 6, while
tage that the ratio between the suspension and the sus
outlet valve 12 closes, preventing any suspension medium
pension medium, or any other liquid which is to be ad
to leave the separating chamber 5 and to pass through
mixed to a pumped liquid, can be adjusted by adjustment
conduit 13.
60 of the ‘length of the stroke of plunger 2, 3 on one hand,
Chambers 5 and 6, which are located on opposite sides
and plunger 4a on ‘the other hand. However, the dead
of the sealing means 15, are always ?lled with the sus
center positions of both plungers must be simultaneously
pension medium only, so that no solid particles of the sub
reached. In both embodiments, it is necessary that the
stance contained in the liquid suspension can be deposited
volume displaced by plunger 4 or 4a from pump cham
on the sealing means 15, or on the sealing means 20.
65 ber 6, is greater than the volume displaced from sep
Since the continuous ?ow of small amounts of suspension
arating chamber 5 by the larger plunger portion 3, which
.medium through gap 16 during both pump strokes pre
is obtained :by making the ‘diameter of plunger parts 2
vents the suspension from ?owing from chamber 7 into
greater than the diameter of plunger parts 4 and 4a.
separating chamber 5, the suspension cannot be admixed
‘It will be understood that each of the elements de
to the suspension medium in chamber 5, and the sealing 70 scribed above, or two or more together, may also ?nd a
means 22 are protected from any deposit of solid sub
useful application in other types of pumping arrange
stances contained in the suspension.
ments for continuously adding a liquid to ‘another pumped
The amount of the suspension medium which is added
liquid differing from the types described above.
through gap 16 to the suspension in pump chamber 7 can
While the invention has been illustrated and described
be determined, and the suspension supplied to pump cham 75 ‘as embodied in a metering pump for pumping a suspen
3,091,186
5
sion completely separated from the sealing means of the
pump, it is not intended to be limited to the details shown,
since various modi?cations and structural changes may
be made without departing from the spirit ‘of the present
invention.
Without further analysis, the foregoing will so fully
reveal the gist of the present invention that others can
6
sealed from each other by said sealing means in said
second opening; a conduit means connecting said outlet
of said second pump chamber with said inlet of said sep
arating chamber ‘and including a check valve; and mov
able pumping means including a ?rst part located in said
?rst pump chamber and in said separating chamber and
passing through said ?rst and second openings while
slidingly engaging said sealing means, and a second part
by applying current knowledge readily adapt it ‘for various
located in said second pump chamber, said ?rst and sec
applications without omitting features that, from the
standpoint of prior art, ‘fairly constitute essential char 10 ond pants being connected for synchronous reciprocating
movement to alternately perform suction strokes, and
actenistics of the generic or spei?c aspects of this invention
pressure
strokes effecting discharge from the respective
and, therefore, such adaptations should and are intended
to be comprehended within the meaning and range of
equivalence of the following claims.
chambers and being constructed ‘and arranged so that
said ?rst part dispenses during a pressure stroke a metered
What is claimed as new and desired to be secured by 15 volume of the ‘liquid suspension from said ?rst pump
chamber ‘and dispenses a given metered volume of the
Letters Patent is:
l. A metering pump arrangement for dispensing me
tered volumes of a liquid suspension containing propor
tionate amounts of a substance and of a ‘liquid suspension
liquid suspension medium from said separating chamber
through said ?rst opening into said ?rst pump chamber,
and so that said second pant dispenses during the suction
medium in which the substance is suspended, comprising 20 stroke of said ?rst part a given metered volume of said
liquid suspension medium ‘from said second pump cham
?rst wall means de?ning a ?rst pump chamber having an
ber into said separating chamber to effect ?ow of sus
pension medium through said ?rst opening into said ?rst
a separating chamber adjacent said pump chamber and
pump chamber so that the ‘liquid suspension is prevented
having an inlet, said ?rst wall means including a partition
ing ‘wall between said ?rst pump chamber and said sep 25 from ?owing into said separating chamber and said sub
stance is prevented from contact with said sealing means
arating chamber having a ?rst opening connecting said
inlet means for a liquid suspension and an outlet means,
?rst pump chamber and said separating chamber, and
another wall bounding said separating chamber and
during both strokes of said ?rst part.
3. A metering pump arrangement for dispensing
metered volumes of a liquid suspension containing pro
formed with a second opening; sealing means in said sec
ond opening; second wall means de?ning a second pump 30 portionate amounts of a substance and of a liquid suspen
sion medium in which the substance is suspended, com
chamber having an inlet and an outlet for the liquid sus
pension medium only; a conduit means connecting said
outlet of said second pump chamber with said inlet of
said separating chamber and including a check valve; and
movable pumping means including a ?rst part located 35
prising ?rst wall means forming a ?rst housing de?ning
a ?rst pump chamber having an inlet means for a liquid
suspension and an outlet means, a separating chamber ad
jacent said pump chamber and having an inlet, said ?rst
wall means including a partitioning wall between said
in said ?rst pump chamber and in said separating cham
?rst pump chamber and said separating chamber having
ber and passing through said ?rst and second openings
a ?rst opening connecting said ?rst pump chamber and
while slidingly engaging said sealing means, and a second
said separating chamber, and another wall bounding said
part located in said second pump chamber, said ?rst and
second parts being connected for synchronous movement 40 separating chamber and formed with a second opening;
sealing means in said second opening; second wall means
to alternately eitect discharge from the respective pump
forming a second housing spaced from said ?rst housing
chambers and being constructed and arranged so that said
?rst part dispenses during a pressure stroke a metered
and de?ning a second pump chamber having an inlet
vvolume of the liquid suspension from said ?rst pump
and an outlet for the liquid suspension medium only; a
liquid suspension medium from said separating chamber
through said ?rst opening into said ?rst pump chamber,
chamber with said inlet of said separating chamber and
including a check valve; and movable pumping means
chamber and dispenses a given metered volume of the 45 conduit means connecting said outlet of said second pump
and so that said second part dispenses during the suction
strokevof said ?rst part a given metered volume of said
including a ?rst part located in said ?rst pump chamber
ber into said separating chamber to effect flow of sus
sealing means, a second part located in said second
pump chamber, and a transmission means connecting said
and in said separating chamber and passing through said
liquid suspension medium from said second pump cham 50 ?rst and second openings While slidingly engaging said
pension medium through said ?rst opening into said ?rst
pump chamber so that the liquid suspension is prevented
from ?owing into said separating chamber and said sub
?rst and second parts for synchronous reciprocating move
ment in such a manner that said ?rst part performs a
stance is prevented from contact with said sealing means 55 pressure stroke into said ?rst pump chamber when said
second part performs a suction stroke out of said second
during both strokes of said ?rst part.
pump
chamber and vice versa, to alternately effect dis
2. A metering pump arrangement for dispensing me
charge from the respective pump chamber and being
tered volumes of a liquid suspension containing propor
constructed and arranged so that said ?rst part dispenses
tionate amounts of a substance and of a liquid suspension
during a pressure stroke a metered volume of the liquid
medium in which the substance is suspended, comprising 60 suspension from said ?rst pump chamber and dispenses
a given metered volume of the liquid suspension medium
from said separating chamber through said ?rst opening
a separating chamber adjacent said pump chamber ‘and
into said ?rst pump chamber, and so that said second
having an inlet, said ?rst wall means including a par
part
dispenses during the suction stroke of said ?rst part
titioning wall between said ?rst pump chamber and said 65 a given metered volume of said liquid suspension medium
separating chamber having a ?rst opening connecting
from said second pump chamber into said separating
said ?rst pump chamber and said separating chamber,
chamber to e?ect ?ow of suspension medium through
and another wall bounding said separating chamber and
said ?rst opening into said ?rst pump chamber so that
formed with a second opening; sealing means in said
the liquid suspension is prevented from ?owing into
second opening; second wall means connected to said 70 said separating chamber and said substance is prevented
?rst wall means to form a casing with the same and de
from contact with said sealing means during both strokes
?ning a second pump chamber having an inlet and an
of said ?rst part.
outlet for the [liquid suspension medium only, said sep
4. A metering pump arrangement for dispensing
arating chamber and said second pump chamber being
located on opposite sides of said other Wall and being 75 metered volumes of a liquid suspension containing pro
?rst wall means de?ning a ?rst pump chamber having an
inlet means for a liquid suspension and an outlet means,
3,091,186
portionate amounts of a substance and of a liquid sus
pension medium in which the substance is suspended, com
prising ?rst wall means de?ning a ?rst pump chamber
‘having an inlet means for a liquid suspension and an
outlet means, a separating chamber adjacent said pump
chamber and having an inlet, said ?rst wall means includ
ing a partitioning wall between said ?rst pump chamber
and said separating chamber having a ?rst opening con
necting said ?rst pump chamber and said separating cham
ber, and another wall bounding said separating chamber
and formed with a second opening; sealing means in said
second opening; second Wall means de?ning a second
pump chamber having an inlet and an outlet for the
8
ingly engaging said sealing means, and a second part in
cluding an extension of said greater diameter plunger por
tion of said ?rst part and a third plunger portion having
a diameter smaller than said smaller diameter of said
?rst mentioned plunger portion, said second part being
located in said second pump chamber, said ?rst and
second parts performing a synchronous reciprocating
movement to alternately perform suction strokes, and
pressure strokes eifecting discharge from the respective
chambers and being constructed and arranged so that
said ?rst plunger portion dispenses during a pressure
stroke a metered volume of the liquid suspension from
said ?rst pump chamber and said second plunger portion
liquid suspension medium only; a conduit means con
displaces a given metered volume of the liquid suspension
necting said outlet of said second pump chamber with 15 medium from said separating chamber through said ?rst
said inlet of said separating chamber and including a
opening into said ?rst pump chamber, and so that said
check valve; and movable pumping means including a
second part displaces during the suction stroke of said
?rst part including a ?rst plunger portion of smaller
?rst part a given volume of said liquid suspension medium
from said second pump chamber into said separating
separating chamber and passing through said first open 20 chamber to effect ?ow of suspension medium through
ing, and a second plunger portion of greater diameter
said ?rst opening into said ?rst pump chamber so that
located in said separating chamber and passing through
the liquid suspension is prevented from ?owing into said
said second opening while slidingly engaging said sealing
separating chamber and said substance is prevented from
means, and a second part including a third plunger por
contact with said sealing means during both strokes of
tion having a diameter smaller than said smaller diameter 25 said ?rst part.
of said ?rst mentioned plunger portion, said second part
6. A metering pump arrangement as set forth in claim
being at least partly located in said second pump chamber,
5 wherein said smaller diameter plunger portion of said
said ?rst and second parts being connected for syn
second part projects out of said second wall means; and
chronous reciprocating movement to alternately perform
including reciprocating drive means connected to the pro
suction strokes, and pressure strokes effecting discharge 30 jecting part of said smaller diameter plunger portion of
from the respective chambers and being constructed and
said second part.
arranged so that said ?rst plunger portion dispenses dur
7. A metering pump arrangement for dispensing me
ing a pressure stroke a metered volume of the liquid
tered volumes of a liquid suspension containing propor
diameter located in said ?rst pump chamber and in said
‘suspension from said ?rst pump chamber and said second
tionate amounts of a substance and of a liquid suspension
plunger portion displaces a given metered volume of the 35 medium in which the substance is suspended, comprising
liquid suspension medium from said separating chamber
?rst wall means forming a ?rst housing de?ning a ?rst
‘through said ?rst opening into said ?rst pump chamber,
pump chamber having an inlet means for a liquid suspen~
and so that said second part displaces during the suction
sion and an outlet means, a separating chamber adjacent
stroke of said ?rst part a metered volume of said liquid
said pump chamber and having an inlet, said ?rst wall
suspension medium from said second pump chamber into 40 means including a partitioning wall between said ?rst
said separatingrchamber to effect ?ow of suspension me
pump chamber and said separating chamber and having
dium through said ?rst opening into said ?rst pump cham
a ?rst opening connecting said ?rst pump chamber and
ber so that the liquid suspension is prevented from ?ow
said separating chamber, and another wall bounding said
ing into said separating chamber and said substance is
separating chamber and formed with a second opening;
prevented from contact with said sealing means during 45 sealing means in said second opening; second wall means
both strokes of said ?rst part.
forming a second housing spaced from said ?rst hous
5. A metering pump arrangement for dispensing
ing and de?ning a second pump chamber having an inlet
metered volumes of a liquid suspension containing pro
and an outlet for the liquid suspension medium only; a
portionate amounts of a substance and of a liquid suspen
conduit means connecting said outlet of said second pump
sion medium in which the substance is suspended, com 50 chamber with said inlet of said separating chamber and
prising ?rst wall means de?ning a ?rst pump chamber hav
including a check valve; and movable pumping means in
ing an inlet means for a liquid suspension and an outlet
cluding a ?rst part including a ?rst plunger portion of
means, a separating chamber adjacent said pump chamber
smaller diameter located in said ?rst pump chamber and
V in said separating chamber and passing through said ?rst
and having an inlet, said ?rst wall means including a par
titioning wall between said ?rst pump chamber and said 55 opening, and a second plunger portion of greater diame
separating chamber having a ?rst opening connecting said
?rst pump chamber and said separating chamber, and
another wall bounding said separating chamber and
ter located in said separating chamber and passing through
said second opening while slidingly engaging said sealing
means, a second part including a third plunger portion
formed with a second opening; sealing means in said
having a diameter smaller than said smaller diameter of
second opening; second wall means connected to said ?rst 60 said ?rst mentioned plunger portion, said third plunger
wall means to form a casing with the same and de?ning
portion being located in said second pump chamber, and
a second pump chamber having an inlet and an outlet
a transmission means connecting said ?rst and second
for the liquid suspension medium only, said separating
parts for synchronous reciprocating movement in such a
chamber and said second pump chamber being located
manner that said ?rst part performs a pressure stroke into
on opposite sides of said other wall and being sealed from 65 said ?rst pump chamber when said second part performs
each other by said sealing means in said second opening;
a suction stroke out of said second pump chamber and
a conduit means connecting said outlet of said second
vice versa, to alternately e?ect discharge from the respec
pump chamber with said inlet of said separating chamber
tive pump chamber and being constructed and arranged ,
and including a check valve; and movable integral
so that said ?rst plunger portion dispenses during a pres
plunger means including a ?rst part including a ?rst 70 sure stroke a metered volume of the liquid suspension
plunger portion of smaller diameter located in said ?rst
from said ?rst pump chamber and said second plunger
pump chamber and in said separating chamber and pass
portion displaces a given metered volume of the liquid
ing through said ?rst opening, and a second plunger por
suspension medium from said separating chamber through
tion of greater diameter located in said separating cham
said ?rst opening into said ?rst pump chamber, and so
ber and passing through said second opening while slid 75 that said third plunger portion displaces during the suc~
3,091,186
tion stroke of said ?rst part a given metered volume of
said liquid suspension medium ?rom said second pump
chamber into said separating chamber to e?ect ?ow of
10
i
said ?rst plunger part displaces during a pressure stroke
the mixed liquid from said ?rst pump chamber and dis
suspension medium through said ?rst opening into said
places the second liquid from said separating chamber
through said ?rst opening into said ?rst pump chamber,
?rst pump chamber so that the liquid suspension is pre
vented from ?owing into said separating chamber and
said substance is prevented from contact with said sealing
means during both strokes of said ?rst part.
8. A metering pump arrangement as set forth in claim
7 and including drive means for reciprocating said trans 10
is prevented from ?owing into said separating chamber
and so that said second plunger part displaces during the
suction stroke of said ?rst part said second liquid from
said second pump chamber into said separating chamber
to e?ect ?ow of the second liquid through said ?rst open
ing into said ?rst pump chamber so that the ?rst liquid
and from contact with said sealing means during both
strokes of said ?rst part.
means being located outside of said ?rst and second
11. A method for dispensing metered volumes of a liq
housings.
uid suspension containing proportionate amounts of a sub
9. A metering pump arrangement as set forth in claim
8 wherein said transmission means include tWo crank 15 stance and of a liquid suspension medium, comprising
the steps of dispensing metered volumes of the liquid
drives respectively connected to said ?rst and second
suspension from a pump chamber by pressure strokes
parts so that said plunger portions of said ?rst and second
of a ?rst pump member, and simultaneously dispensing
parts simultaneously arrive at dead center positions.
during the pressure stroke of said ?rst pump member
10. A pump arrangement for dispensing volumes of a
mixed liquid containing ?rst and second liquids com 20 metered equal amounts of the liquid suspension medium
into said pump chamber through an opening formed be
prising ?rst Wall means de?ning a ?rst pump chamber
tween the wall of said pump chamber and said pump
having an inlet means for a ?rst liquid and an outlet
member, and dispensing by another pump member only
means, a separating chamber adjacent said pump chamber
during the suction stroke of said ?rst pump member me
and having an inlet, said ?rst Wall means having a ?rst
opening connecting said ?rst pump chamber and said 25 tered equal amounts of the suspension medium through
said opening so that proportionate amounts of said sub
separating chamber, and including a wall bounding said
stance and of said liquid suspension medium are dispensed
separating chamber and formed with a second opening;
by said ?rst pump member from said pump chamber
sealing means in said second opening; second Wall means
While no sealing means are required in said opening to
de?ning a second pump chamber having an inlet and an
mission means, said transmission means and said drive
outlet for the second liquid only; a conduit means con 30 prevent passage of said liquid suspension through said
necting said outlet of said second pump chamber with
said inlet of said separating chamber and including a
check valve; and movable plunger means including a ?rst
plunger part located in said ?rst pump chamber and in said
opening.
References Cited in the ?le of this patent
UNITED STATES PATENTS
separating chamber and passing through said ?rst and 35
1,322,236
Fish ________________ __ Nov. 18, 1919
second openings While slidingly engaging said sealing
1,483,143
Whitlock ____ _..=_ _____ __ Feb. 12, 1924
means, and a second plunger part located in said second
2,330,781
Longmyhr ___________ __ Sept. 28, 1943
pump chamber, said ?rst and second plunger parts being
connected for reciprocating synchronous movement to
alternately effect discharge from the respective pump 40
chambers and being constructed and arranged so that
2,365,234
Wineman ____________ __ Dec. 19, 1944
297,749
Germany ____________ ._ Aug. 8, 1919
FOREIGN PATENTS
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