US1988470A - Centrifugal pipe casting apparatus - Google Patents

Description

Jamzz, 19351 Y A. L, Amann 1,988,470 Y,

I CENTRIUGAL HPB CASTING APPARATUS Fiie- Dec. 3o, 1933 r 2 sheets-sheet 1V INVENTOR.

Y f faam/1MM,

ATTORNEY.

Jan. 22, 1935. P. L. ARNQLD 1,988,470

` 'CENTRIFUGAL PIPE CASTING APPARATUS v Filed Dec. 3o.', 1953 2 sheets-sneet 2 v INVENTOR. Ud/0l r/zold,

ATTORNEY.

"id I @Nw mv Patented Jan. 22, 1935 UNITED STATES PATENTo FElcE 'cENrmruGArI PIPE cAsnNG APPAnA'rUs `Application December 30, 1933, Serial No. '104,614` I i 4 claims. (ci. ca -c5) My invention relates to that class of centrifugal pipe casting apparatus in which a rotatable metallic pipe' mold, preferably having a bell end, Vextends through a water box and is provided at one end with a cylindrical driving sleeve sel cured to the end of the mold and extending back over the adjacent portion of the mold at a distance from the mold so as to form a water chamber between the sleeve and the mold, opening into the water box, such as a sleeve. particularly when used in connection with the bell end of a mold, being preferably provided with gearteeth on that lportion which extends beyond the wall of the water box to serve as a-means in connection with a gear train and driving motor for rotating the mold. As heretofore constructed, it has been found that at times and particularly in connecv tion with the bell end of the mold, there was an sleeve an annular centrifugal pump rotating with insufcient circulation of water in the space between the driving sleeve and the mold, with consequent defects in the cast pipe produced in the mold and injury to this portion of the mold and the object of my invention is to provide in such a structure for an ample and effective ow oi water over the end portion of the mold and the essential features of my invention consist in securing in place betweenthe driving sleeve and the portion of the mold surrounded by the said sleeve a circular partition dividing this annular space into twoannular channels connected to-I gether at their inner vends, said circular partition extending along the mold to some distance beyond the free end of the sleeve secured to the mold and in providing at the end of one of the annular passages formed between the partition and the mold and the partition and the driving the mold and so constructed as to create a ow of water fromv and to the water box progressively through the conduit passages formed between the partition and the mold, thence into the annular passage formed between the partition and the driving sleeve and thence back to the water box, that is to say, in the same direction in which the water would tend to flow under the influence of the centrifugal force applied to it as it rotates with the annular passages through which it passes.

The energy of the cooling action of the water as it passes over the mold surface would depend partly on the volume of water and, vto a large extent, `upon its rate of iiow in contact with the mold. The rate of flow could be partly determined by the cross-sectional area of the annular space between the circular partition and the mold but both the volume and rate of ow are, to a, great extent, dependent upon the capacity of the annularcentrifugal pump and this, in turn is largely dependent upon the linear speed of its rotation and, particularly, in the case of molds of comparatively small diameter, this makes it important that the annular centrifugal pump element ofthe structure should be located at a considerable radial distance from the mold and, preferably, connected to the outlet end of the annular passage, between the circular partition and the driving sleeve, this construction also having the advantage that it avails itself to the greatest extent of the tendency of the water to iiow outwardly under the influence of centrifugal force developed by its rotation in and with the annular passages through which it is drawn. It is, however, quite practicable and sometimes advantageous to connect the annular centrifugal pump with the outer end of the passage formed between the circular partition and the mold, in which case it acts to force the water through the channels.

My invention will be best understood as described in connection with the drawings forming a part of this specification, in which Figure 1 is a sectional elevation of those portions of a centrifugal pipe casting machine to which my improvements are applicable and are applied taken on a vertical plane extending through the center line of the centrifugal mold, the central portion of the water box and mold being broken away to enable the end portions to be shown on a larger scale.

Figure 2 is an enlarged fragmentary section in which the driven end of the mold, the driving sleeve and the features which constitute my invention are shown on a larger scale.

Figure 3 is a sectional view partly in elevation, the section being taken as on the line 3-3 of Figs. 1 and 2.

Figure 4 is a fragmentary sectional view similar to Fig. 2, showing a modification and Figure 5 is a sectional View on the line 5-5 of Fig. 4.

A indicates the water box which ordinarily water box. D indicates the centrifugal mold having a bell end, indicated at D1, on the outer end of which is secured a ring D2 forming in effect a flanged extension o1' the bell end of the mold. E is a driving sleeve having an outwardly extending ange E1, by means of whichit is secured to the ring D2 as by means of bolts indicated at E3. 'Ihe body of the driving sleeve extends over the adjacent portion of the mold at a distance therefrom so as to form an annular water chamber between the driving sleeve and the mold which, at the open end of the sleeve, is in free communication with the water box. The driving sleeve extends through the wall A2 of the water box and through the gear chamber A3 and this portion of the sleeve is, as shown, provided with gear teeth, asindicated at E, which is engaged by gearing, as indicated at F actuated by a motor, as indicated at F1. Packing is provided, as indicated at G, to form a water tight joint between the driving sleeve and the wall of the water box. At its spigot end the mold is formed with a sleeve ex.

tension, as indicated at H, adapted to form a water tight joint with the wall A1 of the water box. To the extent above described, the apparatus shown in the drawings is a well known construction and forms no part of my invention.

J is a circular partition located in the annular chamber formed between the sleeve E and the bell end of the mold, dividing said annular chamber into two annular passages, one, K, lo-

cated between the partition and the bell and the other, K1, located between the partition and the sleeve, connected together at their inner ends, as indicated at K2. 'I'he circular partition extends outwardly to some distance beyond the end of the sleeve E and, as shown in Figs. 1, 2, and 3, the outer end of the annular passage K1 communicates with the water box through an annular centrifugal pump structure formed by an annular ring iiange L secured to the end oi' the driving ring and an annular radial flange extending from the outer end of the circular partition and indicated at L1 between which plates where they face each other, are secured impeller blades as indicated at M so as to constitute the structure an annular centrifugal pump. 'I'he annular plate L1 and the circular partition J towhich it is attached are secured in place, as shown, by bolts passing through the plate L1 and screwing into the end of the driving sleeve J, asindicated at T.

In the modiilcation illustrated in Fig. 4, N is an annular plate secured to rotate with the mold and located at some distance in front of the end of the circular partition J and 0 is an annular hood like extension from the end of the circular partition extending over the top of the annular plate N and down opposite the -upper portion of said annular plate, as indicated at O1, and between this partition and the hood andthe upper part vof the plate N are secured impeller blades P, constituting this portion of the structure a centrifugal pump which I have indicated at M1. 'I'his structure provides a water conduit made up of the annular entrance opening Q, the annular chamber Q1 lying below the impeller blades P, the space between the portion 01 of the hood and thel upper portion of the annular plate N and the space Q2 lying beneath the hood and over the plate N and connecting with the outer end of the annular conduit K, thence through the passage K2 into the annular passage K1 and thence into the water box. In the construction shown, the hood 0 and the circular partition J secured to the hood or forming an extension of the hood, are

secured -in place by being attached to brackets extending out from the water box, and indicated at R, and the inner end of the circular partition J is further aligned in its position within the driving `sleeve by spacers as indicated at R1. At

.S I have indicated the location in the hood of more or less radially arranged plates or vanes for counteracting any rotary movement which may be imparted to the water in passing through the centrifugal pump element.

In the construction shown in Figs. 1, 2, and 3, when the mold is in rotation, the annular centrifugal pump element connected, as described, with the outer end of the annular conduit K1, creates a ilow of water into the free end of the annular conduit K which passes rst over the surface of the mold, thence outward through the passage K* into the annular passage K1, thence longitudinally outward into the space lying beneath the centrifugal pump M and thence outward into the water box.

In the construction indicated in Fig. 4, the centriiugal pump M1, when the mold is in rotation, draws in water from the water box through the annular opening Q and forces it into the curved annular passage indicated at Q2, from which it passes to the annular conduit passage K, thence through the passage K2 into the annular passage K1 and thence into the water box. 4

It will be understood that in both modifications of my invention, the object to be had in view is to secure a proper degree of cooling of the portion of the mold lying within the driving sleeve by bringing about such a flow of water through the annular Aconduit passage K as will effect this result and the energy of iiow through this passage will be determined partly by the cross-sectional area of the annular conduit K and partly by the total ow oi water eiIected by the centrifugal pump and the capacity of the pump, so to speak, is largely dependent upon the linear speed with which its impeller blades move, their angular speed being, of course, that of the mold, and, therefore, the greater the diameter of the annular centrifugal pump the more effective it will be in creating a flow of water. It is also true, of course, that the capacity of the pump will depend, to a certain extent, upon the setting of the impeller blades.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a centrifugal pipe casting machine comprising a water box, a metallic mold extending through the water box, having attached to its end a driving sleeve extending over and spaced away from the adjacent portion of the mold and extending through a wall of the water box with its open end lying within the water box and means for rotating the mold connected to that portion of the driving sleeve which lies outside of the wall of the water box, improved means for bringing about a ow of water over the portion o1' the mold lying within the driving sleeve whichl the circular partition between it and the mold 'and between it and the driving sleeve.

2. Apparatus as called for in claim 1, in which the rotary pump consists of a centrifugal pump 5 located at the outer end of the outer annular passage. 4

3. Apparatus as called for in claim 1, in which an outwardly extending annular passage is provided at the outer end of the outer annular pas- 10 sage formed between the circular partition and the driving sleeve and in which impeller blades are so located in said outwardly extending annular passage as to constitute in connection with said passage a centrifugal pump.

4. Apparatus as called for in claim 1, in which a metallic mold is provided with a bell end and the driving sleeve is secured to the end of the bell end of the mold.

PAUL L. ARNOLD.

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