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Патент USA US2136142

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NOV. 8, 1938.
Filed June 25, 1955
_ 2,136,142
2 Sheets-Sheet 1
33 4|
Nov. s, 1938.
‘ 2,136,142
Filed June 25, 1955
2 Sheets-Sheet 2
Patented Nov. 8, 1938
’ Ivar .Meurling, Swarthmore, Pa, asslg'nor, by
mesnc assignments, to American Viscose Cor
poration, a corporation of Delaware
Application June 25, 1935, Serial No. 28,315
5'Claims. (or. 103-125)
This invention relates to pumps'used in spinning rayon, andfmore particularly pumps of the
gear type. One object of the invention is to
produce a simpli?ed structure which will be e?i5 cient and at the same time easy to clean. The
of course very simple to clean such openkgrooves
and to satisfy one’s self that the groove is clean.
While the grooves are shown formed in one plate
only, ‘it will be obvious that the groove can be
formed half in one plate and half in the juxta in
invention will be, shown and described in an em-
posed plate.
bodiment more particularly intended for spinning viscose, but the invention is equally applicable to the spinning of ‘any other solution‘for
Referring now to the drawings, the casing con
sists essentially of two main plates l0 and II
with a thin center plate l2 between them. This
10 making an arti?cial yarn.
In the drawings,
Fig. 1 is a plan view of the two main plates
of the pump casing, opened out, showing the new
open inlet and outlet grooves;
1 -
center plate l2 has an opening in it in which 10
lie the two gears "3,19, The plate is about the
thickness of the gears that do the pumping and
permits the gears toturn, but in contact with
' plates ‘l0 and H. ‘The gears are mounted on
Fig. 2 is a horizontal section on the median ‘shafts 20, 2| respectively carried by bearings in 15
line through the assembled pump, taken on the the main plates H], H. The main plates III, II
line 2-2 of Fig. 5;
are kept in register with each other by pins
Fig. 3 is an elevation of the pump in its op- 46 lying in holes 41 at the end of the,v plates.
erative position, partly in section, taken through All three plates are held together by screws l5
20 the main gear shaft on the line 3-3 of Fig. 5; placed at any desired position around the plates, 20
Fig. 4 is an enlarged detail of the outlet groove
these screws passing through the center plate as '
and of the pumpggear teeth‘at the point of
wellas through the two outside plates. It is
meshing; while
thought desirable to have some of the'screws
Fig. 5 is an elevation of the pump from vthe
25 side, on which the ‘driving wheel is located:
In spinning rayon it is customary to use a
come in from one plate and some from the other
(Fig. 1). The juxtaposed or interior faces of the J,
three plates are machined smooth and make a -
pump to force the solution through the spinneret
into the setting bath, and one of the more usual
liquid-tight ?t when the plates are screwed to~_
gether.- In this way the center plate serves, as
a closure for the grooves I3, M which constitute
the inlet and outlet for the solution. The por- 30
tion of the center plate between the two gears
I8, I 9 is cut away Se that the area between
the gears is open (Fig. 4). This opens the ends
‘ of the inlet and outlet grooves or passages sum
.types for this work is the gear pump. It is essen30 ‘tial for a pump used in spinning rayon that it
deliver an absolutely uniform quantity‘ of spinning solution continuously. In view of this fact
and the ‘fact that a viscose pump runs at a low
speed, the pump must be built with great ac-
35 curacy and kept perfectly clean. If avmachine
which is spinning rayon stops for several days,
it is necessary to take the pump apart and clean
it thoroughly.
It is necessary to remove even
eiently t0 Permit‘the liquid to be taken by the 35
gear wheels on one side and discharged on the
other. It will be observed that the solution is
delivered to the gears from the plate H on one
the thinnest ?lm from the passages through
40 which the solution flows in order that no difliculty
shall be encountered with small bits of hardened
solution when the machine starts spinning again.
Heretofore it has been very difficult to clean a
gear pump‘ satisfactorily, because some of the
side 48 of the gears and at the point where the
teeth are Separating The sellltidn is carried 40
around with the teeth as they travel to theesid'e
Where they mesh- 0n the Side Of the gears Where
the teeth mesh, the Outlet Passage is, of course,‘
in the plate I!) which is the opposite Side Of the
45 passages are inaccessible.
gears from the inlet.
‘One of the features of my invention lies in
Referring to Figs. 1 end 2 0f 'the drawings,
the ease with which the pump can be cleaned, it will be observed that the) solution enters
Heretofore the inlet and outlet passages for the through a passage l5 Which ‘8085 Straight. i- 6-,
viscose have each been bored through one of the .without turns, through the outer casing to the
> 50 solid plates constituting the casing and the passages have come to the surface of this plate only
inner surface thereof and from this point on until 50
the liquid is delivered to the gears of the pump,
at the pump gears. According to my invention
these passages now are placed at the surface of
the plates so that they form nothing but( shallow
55 grooves when the casing is taken apart. It is
the groove is entirely open and accessible for
cleaning. The construction of the pump issiml
plified. in a number of other ways, all of which
will be describedin connection with the drawings. 55"
It will be seen that in order to clean the pump
it is necessary merely to take out ,the screws and
separate the three plates, when all interior pas-_
sages will be open and available for cleaning with
in sight of the operator. The portions I6, I1 of
the inlet and outlet grooves I3, I4 which go
straight through to the outer face of their re
, spective plates are short and straight and can be
cleaned and examined easily. By thus making
10 open grooves of all portions of the passages going
longitudinally of the plates, all di?iculty in clean
ing is avoided.
In a gear pump, as the teeth come together and
mesh, they tend to capture some of the liquid be
15 tween them so that it cannot escape.
In order
to avoid any undue pressure from such captured
liquid, I have lengthened the discharge passage
I4 until the end of the passage almost reaches
the line joining the center of the two gears. This
provides a simple means of releasing any cap-,
turcd liquid. This feature isvillustrated in Fig. 4. _
As already mentioned, the’two gears I8, I9 are
ings. The outer surface of the plate. II with
which the driving gear is in contact is carefully
machined. The driving gear 21 is held on the
surface of the main plate I I by means of a thrust
screw 30 carried by a cover 28. In this way a
liquid-tight seal is formed between the driving
gear and the outer surface of the main plate II.
The cover 28 overlies nearly all of the driving
gear 21, and it is fastened to the main plate II
by means of three screws 3I. It will be observed 10
that by means of this simple arrangement the
gear is protected;
In the center of the driving gear 21 is ?xed a
hollow sleeve 32. Lying diametrically across the
inside of this sleeve is a pin 33.
The end of the 15
long gear-shaft 2| is slotted at its outer end to
receive this pin 33, a slotted connection thus be
ing made between the driving gear 21 and the
shaft of one ofthe gear wheels. The sleeve 32 '
extends into a recess 34 in the outer face of the 20
main plate II. This recess acts as an oil pocket.
The recess and the extension of the sleeve ?t to
mounted on shafts; 20 and 2I which has their gether snugly and keep the gear centered. The
bearings in the main plates I0 and II. Another sleeve, however, does not occupy the entire'space
25 novel feature of my pump is‘ the manner in which
formed by this recess 34, as can be seen from Fig. 25
the unavoidable leakage between the gear shafts 2 of the drawings. To provide an adequate bear
and their bearings is taken care of. My pump is ing for the shaft 2| in the plate I I, there is a boss
not of the open type but is of the enclosed type. 35 which can extend into the recess 34 to a point,
I provide oil pockets at‘ the ends of the shafts and practically level with the adjacent outer surface
30 ?ll them with oil. I have found that due to the
of the casing. The sleeve 32 does not contact 30
pressure of the oil being lower than the pressure with this boss but leaves room for circulatiomof
of the pump the oil in ‘such pockets does not pene
oil between the‘boss and the sleeve. The bearing
trate through to the inside of the pump and get for‘the short shaft 20 of the gear I8 can for con-,
mixed with the ‘solution which goes to the spin
venience be bored completely through the main
neret. On the other hand, any spinningsolution plate II, but if it is bored through it is covered
which forces its way between the shafts and their ,liquid-tight by the-driving gear 21, as in the case
bearings will be kept in a soft condition by the oil of the other bearing/There is an opening 36
in the pocket, and thus I prevent any hardening from the space at the end of the short shaft'20
v_ of the solution.
which provides a communication between the re
The bearings will now be described, those in the cess 34 and the end of the bearing for the shaft 40
plate I0 being described ?rst. In’this plate are 2II.v The shaft 20 does not extend to the outer
circular holes 43 in which turn the shafts 20 and face of the main plate I I, thus affording room for h a
2| for ‘the gears. The bearings. ?t the shafts as circulation of oil opposite the end of the shaft.
closely as is possible.
There is an oil reservoir 31 in the plate I I which
Thesé' openings ,or holes 45 through the plate I0 terminate in a pocket at the
is connected to an oil cap- 33 on the top of the
outer edge of the plate for a purpose. In the ma
plate (Fig. 3). This reservoir connects with the 45
chine shown in the drawings this pocket is formed recess 34 and any driblets of spinning solution
of a circular recess 24 connected to the shaft tend to pass-up tov the reservoir! In additionv
bearings 43 and enclosed by a cover plate 22 held there are holes 39 at diametrically opposite points
to the main plate by a screw 23. The pocket 24 " in the sleeve 32 which permit passage of oil from
thus formed is liquid-tight and I ?ll it with oil. the space between the sleeve and the boss 35 to 50
I ?nd that this oil prevents any solution which the passage 36 on the outside of the sleeve 32.
comes through the bearings from hardening. These holes 39 also serve to lubricate the bearing
The cover of the oil pocket can be removed if between the sleeve and the recess 34. The holes
desired. The normal process of cleaning out the are connected on the outside of the ‘sleeve by. a
pocket-which does not require removal of the circumferential groove 44. It will be observed 55
cover~—will now be described.
that the circulation of oil will take’ care of both
This oil pocket 24 can be seen in Figs. 2 and 3
of the drawings. Referring more particularly to
It will be noted that the sleeve 32 has a ?ange
Fig. 3, it will be observed that the oil pocket is, 40 overlying the outer side of the driving gear 21 60
connected to an auxiliary reservoir 25‘which leads and that there is a closure 4| permanently hi-H
to an oil cap 26 on the upper side ‘of. the main serted in the center of this sleeve (Fig. 2). This
plate II]. By opening the oil cap 26 and dropping ‘closure also has a shoulder or ?ange 42 overlying
oil into the reservoir 25, the pocket 24 can be kept the outer face of the sleeve 32, and this closure
full of oil. It has further been discovered that if ‘contacts with the end thrust screw 30 on the cover
the oil used is of higher specific gravity than the 28. It will be observed that with this overlapping
vspinning solution, the spinning solution will tend shoulder or ?ange arrangement of the closure and
to rise into the oil reservoir 25 and can be re
sleeve the end thrust screw 30 located dutside the
moved. This need be done only at long intervals. gear 21 has a direct pressure on the driving gear,
By following out this method of operation it is pressing it against the smooth outer face of the 70
necessary to remove the cover plate 22 only for casing so as to make the closure liquid-tight. The
inspection purposes.
end thrust screw'30 has a lock nut 45 on the out-/ I
The pump is driven by a gear 21 ‘fastened on the side of the cover to ‘permit adjustment of the
outer surface of the main plate II. ‘This driving '
gear can be seen in Figs. 2, 3 and 5 of the draw- '
To disassemble the‘ driving mechanism it is
. 3
necessary merely to unscrew the three screws
holding the cover onto the main plate I l and the
driving gear 21 can be removed, giving access to
the recess 34 for inspection as well as for examina
tion of the driving gear itself.
I have discovered that it is unnecessary to have
chine, pump gears, shafts , carrying said gears
and a casing surrounding and forming bearings
for said shafts, in combination with a gear out-‘
side the casing adapted to engage'and drive the
end of one of the shafts, and a non-revolu’blev
guard for the driving gear mountedon the cats
the two main plates of maximum thickness
throughout.v Thus while it is necessary for the
ing ‘ outside the gear covering the latter and
pressing it against the casing.
the portion of the plates where the spinning solu
casing surrounding said gears and forming
bearings for the latter, and an oil pocket‘ sur
rounding one of the ends of said shafts and
2. In a gear pump for a rayon spinning ma
portion of the plate which contains thebearings
and the oil pockets to be of a certain thickness, _ chine, pump gears, shafts carrying said gears, a.
> tion inlet I6 is located and the spinning‘ solution
outlet l1 need not‘be of any such thickness. i
have discovered that it is better to make this por ‘adapted to receive any spinning solution which
tion of each plate much thinner, thus making the ' comes through the bearing and prevent it from
holes through the plates shorter and easier to
The path of the spinning solution throughthe
pump is as follows. The spinning solution enters
20 at the passage iii in the main plate ii (Figs. 2
and 3) and goes from there direct to the inner
face of the plate H where it traverses the inlet
groove l3 to a position beside the gear wheels
l8 and I9. At this position the gear teeth are
25 turning away from each other, that is to say, on '
the upper or inlet side 48 as the gears are shown
hardening, in combination with a gear adapted
to drive the shaft end and to serve as a closure
for said oil pocket, and means acting on,‘ the
outer side of said gear adapted to hold same’
in liquid-tight contact with the casing.
3. In‘ a gear pump for a rayon spinning ma
chine, pump gears, shafts carrying said gears
and a casing surrounding the latter and form
ing bearings for the shafts, in combination with
an oil pocket for the\ end of one of said shafts
having an oil opening above the level *of the
shafts, a gear adapted to engage and drive the
in Fig. 4, and the solution is therefore taken be
tween the teeth of the gears 18 and i8 and the shaft end and to serve as a closure for‘said oil
center plate l2. The solution is carried around ‘pocket, and means acting on the outer side of 30
30 until it comes to‘ the discharge or outlet side, vsaid gear to hold same against- said casing.
4. In a gear pump for a rayon spinning ma
where it meets the outlet groove l4 (Figs. 1 and
pump gears, shafts carrying said pump
4). As already mentioned, this groove extends
beside the gear wheels to a point almost reaching gears and a.‘ casing surrounding said gears and
the line joining the centers of the two gears so 'forming' bearings for said shafts, said casing
that any liquid which may be imprisoned between being formed of plates with’open grooves on
the‘ teeth isexpelled laterally into the outlet . juxtaposed faces serving as passages for the '
groove [4. The spinning solution passes along spinning solution to and from ‘the gears, said
bearings and shafts permitting a trace of»spin
this outlet groove until it comes to the short pas
sage " leading through the main plate l0, where ning solution to come through to the outside
of the bearings for lubrication, in combination 40
40 it is discharged from the pump. Owing to the
pressure under which the solution is moving
through the pump, there always is a slight leak
age through the bearings of the gears, as already
mentioned. This inevitable leakage goes into the
oil-?lledv pockets 24 and 34,.the leakage always
being kept soft by the presence of the oil. ‘The
oil pockets and oil reservoirs are large enough so
that it is necessary to clean out or get rid of the
surplus spinning solution only at long intervals.
It will be seen that the pump is composed of a
minimum number of parts which can beassem
bled and disassembled with great ease and that it
is not necessary in the “ordinary running of the
with an oil pocket whose oil is in, contact with
the bearing end of one of said shafts to make
the leaking solution harmless, a. revolving gear _
adapted to engage and drive said shaft end and
serving as a closure for‘ saidoil pocket, ‘and
means mounted exterior of said shaft, oil pocket.
and gear, holding the latter removably against
the casing to close the oil pocket.
' 5. In a gear pump for a rayon spinning ma
chine, pump gears,v shafts carrying said pump 50
gears and a casing-surrounding said gears and
forming bearings for said shafts, said bearings
and shafts permitting a trace of spinning'solu-v ,
tion to come through to the outside of the bear-4
pump to disassemble it at all; If for any reason
for lubrication, in combination with an oil
the pump is stopped and it is, necessary to clean ing's
pocket whose oil is in contact with the bearing
it, it can be disassembled very‘easily and the inlet a end of one of said shafts to make the leaking
and outlet passages and‘ all other passages solution harmless, a revolving gear‘ adapted to
through whichthe' solution passes are easily ac ' \engage and drive said shaft end and serving as a
cessible and in fact laid open to the operator.
60 The only passages which are, not open on one side closure for said oil pocket, and means mounted
exterior of said shaft, oil pocket and gear, hold
throughout their length are the two short pas
ing the latter removably against the casing'to
sages l 8‘ and I1 passing through the thin portions
of the main'plates It and Ill from one side to the
What I claim is:
In a gear pump for a rayon spinning ma-'
close the oil pocket.
vIvan momma.
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