US1927749A - Artificial silk spinning pump - Google Patents

Description

Sept. 19, 1933. w K|MMIG 1,927,749

ARTIFICIAL SILK SPINNING PUMP I Filed March 17, 1930 Ila All zzzw fihmg ..BY

. ATTOR Y.

Patented Sept. 19, 1933 UNITED STATES PATENT OFFICE many,

in. b. H., Wuppertal-Barmen,

Prussia, Germany assignor to the firm Martin Holken Rhenish,

Application March 17, 1930, Serial No. 436,265, and in Germany July 3, 1928 5 Claims. (Cl. 103-126) I have filed applications in Germany, July 3, 1928; Switzerland, Oct. 21, 1929; Italy, Oct. 25, 1929; England, Oct. 26, 1929; Netherland, Oct. 28, 1929; France, Oct. 31, 1929.

5 It is well known and in general use to employ in the case of artificial silk spinning pumps the spinning liquid itself also for lubrication purposes. Since however only a very small quantity of liquid is requisite for the purpose of lubrication, it has hitherto been considered most suitable to arrange a main path for the supply of the quantity of liquid passing to the place of consumption and a branch for the quantity of liquid circulating through the place of lubrication.

For the lubrication proper, that is for the avoidance of corrosion phenomens, only an extraordinarily small quantity of liquid is necessary. This small quantity of liquid, however, becomes heated at the lubrication places to an extent which does not impair the lubrication but which in another respect is highly injurious. This heating,,namely, favours chemical changes between the metal of the pump and the spin-' ning solution, particularly when the process is carried on with copper-oxide-ammonia. If there pass back even only small quantities of such chemically changed spinning solution into the main current of the quantity of liquid passing on to the place of consumption, there arises a chemical alteration of the spinning solution with the result that yellow spun threads are produced which are unusable.

Now the next idea would be no longer to allow the small quantity of the spinning solution which has been conducted to the lubrication places to pass back to'the main stream but always to bring it into circulation again only between the lubrication places. Nevertheless this solution of the problem fails on account of the fact that the quantity of liquid to be brought into circulation between the circulation places is extraordinarily small.

According to the invention the method of procedure is reversed: instead of separating the liquid which has been chemically changed in consequence of the heat developed at the lubrication places, the total quantity of the spinning liquid is led through the lubrication grooves of the bearing places and thereby the quantity of heat to be taken up is distributed to such quantity of the spinning solution that the hea ing which occurs is insuflicient to raise the temperature high enough to enable the chemical change to take place. v The same procedure proves to be suitable,

though in another technical connection, also in the pumping of viscose. In this case the essential point is that during the running of the pump the play of the spindle in the bearing places changes its magnitude. Consequently in the case of all pumps of comparatively old con struction viscose solution penetrates between the spindle and its bearing. The viscose remains a comparatively long time at the place into which it has penetrated and at first acts usefully as a means of lubrication or at all events non-in-' juriously. But it possesses the property of maturing, that is, of thickening after some time, whereby its power to lubricate decreases. Now either the matured liquid is gradually displaced 7 by other liquid, so that consequently the matured liquid moves with the fresh spinning solution, the latter being injuriously affected, or the matured liquid remains in the bearing place until the spindle becomes fast. Of course before this occurs the parts will have been cleaned at certain intervals, but this work is costly and it impairs the tightness of the pumps.

These defects also are according to the invention avoided by the whole quantity of spinning liquid being led through the lubrication grooves of the bearing places. Here, consequently, that viscose which came into contact with the bearing places is washed away by the viscose following on, so that it does not remain on the bearing place until it matures and cannot harden.

One construction, by way of example, for a toothed wheel spinning pump is represented in the accompanying drawing in which:-

Fig. 1 is a longitudinal section of the pump with a bearing-sleeve, shown in elevation containing the lubrication grooves:

Fig. 2 an elevation of the inner side of a side-plate (the left side-plate in Fig. 1) of the pump casing:

Fig. 3 an elevation of the middle'plate:

Fig. 4 an elevation of the inner side of a casing-plate (the right casing-plate in Fig. 1), on which is situated the spindle bearing:

Fig. 5 a section on the line A-A of Fig. 4 and Fig. 6 a section on the line 3 -3 of Fig. 4.

The pump is driven from the driving spindle 1 and pumps the spinning solution in a well known manner by means of toothed wheels from the entrance-place 2 through the suction chamber 3 towards the pressure chamber 4 and from there to the outlet-place 5. The channels within the pump are so arranged that the liquid fromthe entrance place 2 must flow first through the passages 6 and 7 towards the groove 8 in the spindle bearing place and through said groove along the spindle before it can pass through a channel 10 towards the suction chamber 3. From here it is pumped'by means of the toothed wheels 14,,15 into the pressure chamber 4 and then is led through the channel 11 of the second bearing place of the spindle for the purpose of lubrication. The discharge is effected through the channel 12 to the outlet-place 5.

The spinning solution thus serves to lubricate all the bearing places of the spindle. In consequence of it being continually renewed it is no longer possible for temperature rises to appear in the bearing places. In order to improve the flow round the spindle the lubricating groove 8 in the construction shown by way of example is of a helical shape but it might of course have any other shape. In order to simplify manufacture it is preferable for it not to be formed in the bearing place, but, as shown, to be turned in a separate sleeve 16, which is then inserted in the bearing casing.

The order in which the bearing places are lubricated may also be reversed, on altering the direction of rotation the pressure side being exchanged with the suction side and the direction of flow of the spinning liquid being reversed.

I claim:

1. The combination of an artificial silk spinning pump having a rotary shaft, inlet and outlet conduits, and a helical conduit arranged about and open to the bearing surface of said rotary shaft, and connected in series between said inlet and outlet conduits, said helical conduit and said inlet and outlet conduits having substantially the same internal cross sectional area.

2'. In an artificial silk spinning apparatus, a pump having means for circulating, the whole quantity of spinning fluid as a lubricant for the pump, the said pump having channels therein arranged for the flow of said spinning fluid, a spindle bearing for a drive shaft of the pump comprising a sleeve having a single path for conveying fluid from and to said pump, said sleeve having grooves machined in the shape of a helix and a cutaway portion forming a channel communicating with the helical grooves, the said lubricating grooves of the sleeve being produced by removingthe whole thickness of the material of the sleeve} whereby the lubricating channel is bounded by the pump casing and the slotted sleeve, and the clear cross section of said groove is equal to the clear cross section of the channel.

3. In a device of the kind described, a casing having an impeller chamber therein adapted to contain a pair of gear toothed impellers and having an outlet passage leading from said chamber, a pair of meshing gear impellers in said chamber, said casing having a bearing boss axially alined with one of said impellers and a shaft journaled in said boss and carrying the impeller wherewith it is axially alined, said casing having an inlet passage communicating with the interior of the bearing boss atthe end adjacent the impeller chamber and extending toward the end of the boss remote from the chamber and thence back to and opening into said chamber, that portion of the inlet passage extending away from the chamber being open throughout to the shaft.

4. A pump of the class described, a casing consisting of a center plate having a pair of intersecting circular chambers, and further having a suction chamber and a pressure chamber communicating therewith, a cover plate applied to one side of the center plate and having an outlet passage with its inner end communicating with the pressure chamber, a cover plate applied to the opposite side of the center plate and provided with an entrance passage for fluid, a sleeve in an extension of the second mentioned cover plate having a channel with which the entrance passage of the said cover plate communicates, a driving spindle in said sleeve with which fluid in the channel communicates, the said channel in the sleeve being in communication with the suction chamber of the middle plate, a toothed wheel on the driving spindle,

the said toothed Wheel being located in one of.

the circular chambers of the middle plate, and

a toothed wheel meshing with the first men-'

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