US2136142A

US2136142A - Rayon-spinning pump

Info

Publication number: US2136142A
Application number: US28315A
Authority: US
Inventors: Meurling Ivar
Original assignee: American Viscose Corp
Current assignee: Akzo Nobel UK PLC
Priority date: 1935-06-25
Filing date: 1935-06-25
Publication date: 1938-11-08
Anticipated expiration: 1955-11-08

Description

NOV. 8, 1938. UR I I 2,136,142

RAYON SPINNING PUM/P Filed June 25, 1955 2 Sheets-Sheet 1 30 INVENTOR 33 4| 45 IVAR MEURLING BY HIS ATTORNEYS Nov. s, 193 v M URUNG 2,136,142

RAYON SPINNING PUMP Filed June 25, 1955 2 Sheets-Sheet 2 INVENQ'Q R I? IVAR MEURLING BY HIS ATTORNEYS Patented Nov. 8, 1938 t v UNITED STATES PATENT OFFICE Ivar .Meurling, Swarthmore, Pa, asslg'nor, by

mesnc assignments, to American Viscose Corporation, a corporation of Delaware Application June 25, 1935, Serial No. 28,315 Claims. (or. 103-125) This invention relates to pumps'used in spinof course very simple to clean such open grooves ning rayon, andfmore particularly pumps of the and to satisfy ones self that the groove is clean. gear type. One object of the invention is to While the grooves are shown formed in one plate produce a simplified structure which will be eflionly, it will be obvious that the groove can be 5 cient and at the same time easy to clean. The formed half in one plate and half in the juxtainvention will be, shown and described in an emposed plate. 1 bodiment more particularly intended for spin- Referring now to the drawings, the casing conning viscose, but the invention is equally applisists essentially of two main plates l0 and II cable to the spinning of any other solutionfor with a thin center plate l2 between them. This making an artificial yarn. center plate l2 has an opening in it in which 10 In the drawings, lie the two gears "3,19, The plate is about the Fig. 1 is a plan view of the two main plates thickness of the gears that do the pumping and of the pump casing, opened out, showing the new permits the gears toturn, but in contact with open inlet and outlet grooves; 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 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 0 the main gear shaft on the line 3-3 of Fig. 5; placed at any desired position around the plates,

Fig. 4 is an enlarged detail of the outlet groove these screws passing through the center plate as and of the pump gear 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 the come in from one plate and some from the other side, on which the driving wheel is located: (Fig. 1). The juxtaposed or interior faces of the In spinning rayon it is customary to use a three plates are machined smooth and make a pump to force the solution through the spinneret liquid-tight fit when the plates are screwed tointo the setting bath, and one of the more usual gether.- In this way the center plate serves as .types for this work is the gear pump. It is essena closure for the grooves I3, M which constitute tial for a pump used in spinning rayon that it the inlet and outlet for the solution. The por- 30 deliver an absolutely uniform quantity of spintion of the center plate be e wo gears ning solution continuously. In view of this fact I8, I 9 is cut away Se t a the ea between and the fact that a viscose pump runs at a low the gears is open (Fig. 4). This opens the ends speed, the pump must be built with great acof the inlet and outlet grooves or passages sumcuracy and kept perfectly clean. If a machine eiently t0 Permitthe liquid to be taken by the 35 which is spinning rayon stops for several days, gear wheels on one side and discharged on the it is necessary to take the pu p apa t and clean other. It will be observed that the solution is it thoroughly. It is necessary to remove even delivered to the gears from the plate H on one the thinnest film from the passages through side 48 of the gears and at the point where the which the solution flows in order that no difliculty teeth are Separating The sellltidn is carried 40 shall be encountered with small bits of hardened around w the teeth as y travel to t e sid'e solution when the machine starts spinning again. Where y s 0n t Side O the ea s Where Heretofore it has been very difficult to clean a the teeth mesh, the Outlet P e of co se, gear pump satisfactorily, because some of the n e plate I!) which is the opp Side O t e passages are inaccessible. rs 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 an b l d, it will be observed that the solution enters Heretofore the inlet and outlet passages for the rough a pass 5 Which 8 Straight. viscose have each been bored through one of the .without turns, through the outer casing to the solid plates constituting the casing and the pasinner surface thereof and from this point on until 50 sages have come to the surface of this plate only the liquid is delivered to the gears of the pump, at the pump gears. According to my invention the groove is entirely open and accessible for these passages now are placed at the surface of cleaning. The construction of the pump issim the plates so that they form nothing but shallow plified. in a number of other ways, all of which grooves when the casing is taken apart. It is will be describedin connection with the drawings 55" in the pocket, and thus I of the solution. 40

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 passages will be open and available for cleaning within 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 respective plates are short and straight and can be cleaned and examined easily. By thus making open grooves of all portions of the passages going longitudinally of the plates, all difliculty in cleaning is avoided.

In a gear pump, as the teeth come together and mesh, they tend to capture some of the liquid between 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 is illustrated in Fig. 4.

of the pump the oil in such pockets does not penetrate through to the inside of the pump and get mixed with the solution which goes to the spinneret. On the other hand, any spinningsolution which forces its way between the shafts and their bearings will be kept in a soft condition by the oil prevent any hardening The bearings will now be described, those in the plate I being described first. Inthis plate are circular holes 43 in which turn the

shafts

20 and 2| for the gears. The bearings. fit the shafts as closely as is possible.

outer edge of the plate for a purpose. In the machine shown in the drawings this pocket is formed of a circular recess 24 connected to the shaft bearings 43 and enclosed by a cover plate 22 held to the main plate by a screw 23. The pocket 24 thus formed is liquid-tight and I fill it with oil. I find that this oil prevents any solution which comes through the bearings from hardening. The cover of the oil pocket can be removed if desired. The normal process of cleaning out the pocket-which does not require removal of the cover-will now be described.

This oil pocket 24 can be seen in Figs. 2 and 3 of the drawings. Referring more particularly to Fig. 3, it will be observed that the oil pocket is connected to an auxiliary reservoir 25which leads to an oil cap 26 on the upper side of. the main plate II]. By opening the oil cap 26 and dropping oil into the reservoir 25, the pocket 24 can be kept full of oil. It has further been discovered that if the oil used is of higher specific gravity than the spinning solution, the spinning solution will tend to rise into the oil reservoir 25 and can be removed. This need be done only at long intervals. By following out this method of operation it is necessary to remove the cover plate 22 only for inspection purposes.

The pump is driven by a gear 21 fastened on the outer surface of the main plate II. This driving gear can be seen in Figs. 2, 3 and 5 of the draw- Thes' openings or holes through the plate I0 terminate in a pocket at the 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 that by means of this simple arrangement the gear is protected; I

In the center of the driving gear 21 is fixed a hollow sleeve 32. Lying diametrically across the inside of this sleeve is a pin 33. The end of the long gear-shaft 2| is slotted at its outer end to receive this pin 33, a slotted connection thus being made between the driving gear 21 and the shaft of one ofthe gear wheels. extends into a recess 34 in the outer face of the main plate II. This recess acts as an oil pocket. The recess and the extension of the sleeve fit together snugly and keep the gear centered. The sleeve, however, does not occupy the entire'space formed by this recess 34, as can be seen from Fig. 2 of the drawings. To provide an adequate bearing for the shaft 2| in the plate I I, there is a boss 35 which can extend into the recess 34 to a point,

practically level with the adjacent outer surface of the casing. The sleeve 32 does not contact with this boss but leaves room for circulatiomof oil between theboss and the sleeve. The bearing forthe short shaft 20 of the gear I8 can for convenience be bored completely through the main plate II, but if it is bored through it is covered ,liquid-tight by the-driving gear 21, as in the case of the other bearing There is an opening 36 from the space at the end of the short shaft'20 which provides a communication between the recess 34 and the end of the bearing for the shaft 2II. The shaft 20 does not extend to the outer The sleeve 32 face of the main plate I I, thus affording room for h a circulation of oil opposite the end of the shaft.

There is an oil reservoir 31 in the plate I I which is connected to an oil cap- 33 on the top of the plate (Fig. 3). This reservoir connects with the recess 34 and any driblets of spinning solution tend to pass-up to the reservoir! In addition there are holes 39 at diametrically opposite points in the sleeve 32 which permit passage of oil from the space between the sleeve and the boss 35 to the passage 36 on the outside of the sleeve 32. These holes 39 also serve to lubricate the bearing between the sleeve and the recess 34. The holes are connected on the outside of the sleeve by. a circumferential groove 44. It will be observed that the circulation of oil will take care of both bearings. v

It will be noted that the sleeve 32 has a flange 40 overlying the outer side of the driving gear 21 and that there is a closure 4| permanently hiserted in the center of this sleeve (Fig. 2). This closure also has a shoulder or fiange 42 overlying end thrust screw'30 has a lock nut 45 on the out-/ I side of the cover to permit adjustment of the screw.

To disassemble the driving mechanism it is throughout. Thus while it is necessary for the portion of the plate which contains thebearings and the oil pockets to be of a certain thickness,

the portion of the plates where the spinning solution inlet I6 is located and the spinning solution outlet l1 need notbe of any such thickness. i have discovered that it is better to make this portion of each plate much thinner, thus making the holes through the plates shorter and easier to clean.

The path of the spinning solution throughthe pump is as follows. The spinning solution enters 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 turning away from each other, that is to say, on the upper or inlet side 48 as the gears are shown in Fig. 4, and the solution is therefore taken between the teeth of the gears 18 and i8 and the center plate l2. The solution is carried around until it comes to the discharge or outlet side, where it meets the outlet groove l4 (Figs. 1 and 4). As already mentioned, this groove extends beside the gear wheels to a point almost reaching the line joining the centers of the two gears so that any liquid which may be imprisoned between the teeth isexpelled laterally into the outlet groove [4. The spinning solution passes along this outlet groove until it comes to the short passage leading through the main plate l0, where it is discharged from the pump. Owing to the pressure under which the solution is moving through the pump, there always is a slight leakage through the bearings of the gears, as already mentioned. This inevitable leakage goes into the oil-filled

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 beassembled and disassembled with great ease and that it is not necessary in the ordinary running of the pump to disassemble it at all; If for any reason the pump is stopped and it is, necessary to clean it, it can be disassembled veryeasily and the inlet a In a gear pump for a rayon spinning ma-' chine, pump gears, shafts carrying said gears and a casing surrounding and forming bearings for said shafts, in combination with a gear outside the casing adapted to engage'and drive the end of one of the shafts, and a non-revoluble guard for the driving gear mountedon the catsing outside the gear covering the latter and pressing it against the casing.

2. In a gear pump for a rayon spinning machine, pump gears, shafts carrying said gears, a. casing surrounding said gears and forming bearings for the latter, and an oil pocket surrounding one of the ends of said shafts and adapted to receive any spinning solution which comes through the bearing and prevent it from 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 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 shaft end and to serve as a closure forsaid oil pocket, and means acting on the outer side of said gear to hold same againstsaid casing.

4. In a gear pump for a rayon spinning machine, pump gears, shafts carrying said pump gears and a. casing surrounding said gears and 'forming' bearings for said shafts, said casing being formed of plates withopen grooves on juxtaposed faces serving as passages for the spinning solution to and from the gears, said bearings and shafts permitting a trace ofspinning solution to come through to the outside of the bearings for lubrication, in combination with an oil pocket whose oil is in, contact withthe 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 shafts permitting a trace of spinning'solu-v tion to come through to the outside of the bearing's for lubrication, in combination 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 closure for said oil pocket, and means mounted exterior of said shaft, oil pocket and gear, holdengage and drive said shaft end and serving as a Y ing the latter removably against the casing'to close the oil pocket.

Ivan momma.