USRE21541E

USRE21541E - Pump runner assembly

Info

Publication number: USRE21541E
Authority: US
Publication date: 1940-08-27

Description

Aug. 27, 1940.

Q. JACOBSEN PUMP RUNNER ASSEMBLY Original Filed April 14, 1938 //v l/EA/ TOE Ora rzm/ dnc 0a .szrv

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Reissued Aug. 27, 1940 PUMP RUNNER. ASSEMBLY,

- O'yste'inJacobsen, Dayton, Ohio, assignor to The York 7 Durlron Company, Inc., a corporation of New Original No. 2,143,484, dated January 10, 1939,

Serial No. 201,994, April 14, 1938. Application for reissue April 6, 1939, Serial No. 266,433

, 13 Claims.

I The invention-relates'to a. pump runner assembly 'of the type requiring corrosion-resisting material asthe composition of the runner proper and sleeve whichIcontact with the liquid handled by the pump and a. drive shaft of stronger, tougher material, The invention has for its object the provision of improved means for locking the runne1 ;to itsjshaft, so that in case the pump is started up backwards, the runner will not unsCrew-its'ellf-from the shaft. a

a another object of the invention is to dissipate 'the""heat contained in the sleeve which surrounds-thejdrive shaft and bears against the stuffing box.

; One embodiment of the invention is illustrated in the accompanying drawing, wherein:

a Figure 1"is a longitudinal section through th assembly. v 'Figure "2 is a section on the line li -II of Figure 1, before applying the locking metal. H Figure 3 is a detail view of the shaft.

Referring to the drawing, 4 is the pump runner of corrosion resisting metal, such as high silicairon', which is not subject to machining other than grinding, and 5 is a sleeve or shroud of similar material surrounding and protecting the drive shaft 6 of machinable metal, such as steel or, qthermetal commonly used in shafting. ,In' the pump installation, the stufilng box of the pump casing fits around the sleeve in thecustomary, manner as shown for example in my ntent-Na; 2,049,204, dated July 28, 1936. i I A cavity is provided in the hub I of the runnerwhich carries a filler B of machinable metal, such asibronze, white metal or the like positioned by a casting operation. An opening is provided in the 'filler and threaded to receive the threaded {end '9 of the drive shaft. An annular recess l is provide'd at the end of the filler, and a set of keyways H are milled in the end of the filler communicating at their outer ends with the recess I'll. In the present instance, there are five keyways, as indicated in Figure 2, but this num- "b'e r m'aybe varied, depending on the diameter er the shaft 6. A shoulder is provided on the shaft'at' [2,- against which the lefthand end of the sleeve'5 engages, when the shaft is screwed into position,-.thus placing the sleeve in compression between the shoulder and theend of the huh I and preventing-any rotary movement of the .sleeve relative. to therunner and shaft.

The sleeve, -fits around the shaft relatively closely at the end portions l3, 13 (Fig. 1), but intermediate-.such portions, a substantial clearance spaceis provided to permit of the pouring of the locking material later described. The part of the shaft opposite the annular recess IU-and keyways ll, is provided with a pair of keyways l4, it, which keyways also extend past the portions l3, I3 of the sleeve."' A pair of similar keyways l5, l are provided in the shaft 6 at the shoulder 12, which keyways extend past the portions l3, I3fofthe sleeve'which lie next to the shoulder. Y v The locking ofthe shaft against unscrewing is accomplished by flowing fusible metal lGjsuch as lead or Babbitt through the space between the sleeve and the shaft until the annular recess l0 and-the keyways H leading th'erefrOm are filled. It will be noted that regardless of the rotary position of the shaft with respect to the filler a', the, two keyways I, I4 will always register with a plurality of keyways ill, thus insuring a filling of such grooves by the locking metal and an inter lock against subsequent unscrewing of the shaft. It is apparent that inasmuch as the-shaft cannot become unscrewed, the locking metal also serves to prevent ant movement between the sleeve'i and the runner 4. v

In pouring the locking metal I6,-the' assembly is held with the shaft in vertical'position and is heated'to insure against "freezing of the metal during the pouring operation. One of-thekeyways I5 adjacent the shoulder 12 isutilized as the inlet in pouring, a suitable funnel gate being applied to facilitate the operation. The metal, thus supplied, flows downward between the shaft and sleeve and fills'the annular recess "land all of the k'yways ll.'-'I'he keyway 15 at the shoulder l2, which lies in opposition to the one through which pouring occurs, merelyacts a's'an escape passage for-air or gases during the pouring operation, thus facilitating the free inflow of the metal. When the assembly cools, the locking metal solidifies, and any unscrewing action of the runner relative to the shaft, is positively prevented, due'tothe locking effect of the metal in the two sets of keywa'ys II and UH-the one lying in the filler and the other in the shaft. The arrangement also; gives assurance that the keyways II, which are overlapped by the keyway It, will be filled with the fusible metal, since the combined depth ofthe two keyways permits a much more ready flow of the fused metal than is the case with those of the keyways vll whose sole source of supply; is the annular recess I0. These latter'keyways constitute narrow pockets closed at their inner ends, and into which it is somewhat .diflicult to flow molten. metal because of the air ,trappeditherein a parent that, in the absence of the metal layer.

Hi, there would be an annular air space or chainber between the sleeve 5 and the shaft 6, which would preclude the transferencenof heat. "In this'connection, it must be understood that thisannular space is initially provided in order that the entire inner surface of the sleeve need not be fitted as by grinding to the shaft- -a'laborious and expensive job. It is suflicient that thesleeve contact the shaft only at each end and the inQ- termediate portion of the sleeve be simply ronghcast to provide an annular space.

However, in accordance with the present invention, the metal layer 18, as well as the metal in the annular recess Ill and in the keyways ll, serve not only to provide a rigid lock between the shaft and the runner, but also to offer an easy path for the excess heat to flow from the sleeve 5 into the shaft which is at lower temperature. Thus, the temperature of the sleeve is kept below that at which it would bulge or in any other manner depart from its proper rectilinear shape, even though subjected to longitudinal stress.

It willbe understood that [desire to .compre hend within my invention such modifications as come within the scope of the claims and the invention. I

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is: v w

1. In combination in a pump runner assembly, a runner provided with a hub having therein a threaded socket with an annular recess at the outer end of the socket and a plurality-of spaced keyways in the wall of the socket extending inward from said recess, a drive shaft having its inner end threaded and screwed into the socket and having a keyway adjacent its threaded end extending past the annular recess and along the keyways in thewall of the socket, a shoulder on the shaft remote from the end of the hub, a sleeve on the shaft clamped thereby between the shoulder and the'end of the hub, a pouring passage being provided between the shaft and sleeve extending from the shoulder to the annular recess, and a fusible locking metal filling the passage, the annular recess and said .keyways.

2. In combination in a pump runner assembly, a runner provided with a hub having therein a threaded socket with an annular recess at the outer end of the socket anda plurality of spaced keyways in the wall of the socket extending inward from said recess, a drive shaft having its inner end threaded and screwed into-:the socket and having a keyway adjacent its threaded end extending past the annular recess and along the keyways in the wall of the socket, a shoulder on the shaft remote from the end of the hub, a sleeve on the shaft clamped thereby between the shoulder and the end of the hub, and having its inner surface spaced away from the surface of the shaft except at the ends of the sleeve where the walls of the sleeve have a loose running fit on the shaft, the inner one of such points of running fit lying opposite the keyway in the shaft, a pouring keyway in the shaft at said shoulder extending past the outer one of the points of running fit, and a fusible locking metal filling the space between the sleeve and the shaft, the annular recess and said keyways.

3. In combination in a pump runner assembly, a runner provided with a hub having therein a threadedsocket with an annular recess at the outer end of the socket and a plurality of spaced keyways in the wall of the socket ex- .tending inward from. said recess, a drive shaft having its inner and threaded and screwed into the, socket and having a keyway adjacent its "threaded end extending past the annular recess and along the keyways in the wall of the socket, a shoulder on the shaft remote from the end of the hub, a sleeve on the shaft clamped thereby between the shoulder and the end of the hub, and having its inner surface spaced away from the surface of the shaft except at the ends of the sleeve where the walls of the sleeve have a looserunningfit on the shaft, the inner one of such points of running fit lying opposite the keyway in the shaft, 9. pouring keyway in the shaft at said shoulder extending past the outer one of the points; of .running fit, a venting keyway in the shaft at said shoulder opposite to the pouring keyway also extending past the outer one of the points of. runningfit and a fusible locking metal filling the space between the sleeve and the shaft, the annular recess and the keyways.

4. In combination in a pump runner assembly, a runner provided with a hub having therein a threaded socket with an annular recess at the outer end of the socket and a plurality of spaced keyways in the wall of the socket extending inward from said recess, a drive shaft having its inner end threaded and screwed into the socket andhaving a keyway adjacent its threaded end extending past the annular recess and along the keyways in the wall of the socket, a shoulder on the shaft remote from the end of thehub, a sleeve on the shaft clamped thereby between the shoulder and the end of the hub, a pouring passage being provided between the shaft and sleeve extending from the shoulder to the. annular recess, and a fusible locking metal filling the passage, the annular recess and said keyways, the spacing and width of said keyways being such that in all positions of rotation of socket and provided with a keyway at its threaded I end which extends across the annular recess in parallel with said first keyways and registering with at least one of them, a shoulder on the shaft remote from the end of the runner hub,

a sleeve surrounding the shaft and clamped between the shoulderand the end of the hub when the shaft is screwed into its socket in the filler, a pouring inlet for the annular recess and key- =ways extending from said shoulder longitudinally between the shaft and sleeve to said keyway in the shaft, and a locking body of fusible metal filling said inlet, the annular recess and the keyways.

6. In combination in apump runner assembly, a runner having a hub and a recess therein, a

filler in the recess having a threaded socket with an annular recess at its outer end and a set of keyways extending inward from such recess in spaced relation, a drive shaft threaded into said socket and provided with a keyway at its threaded end which extends across the annular recess in parallel with said first keyways and registering with at least one of them, a shoulder on the shaft remote from the end of the runner hub, a sleeve surrounding the shaft and clamped between the shoulder and the end of the hub when the shaft is screwed into its socket in the filler, the inner surface of the sleeve being spaced away from the shaft providing an annular space which communicates with said keyway in the shaft, a pouring inlet for said space at the outer end of the sleeve, and a locking body of fusible metal fitting said space and also the annular recess and keyways which are in communication therewith.

'7. In combination, a pump runner assembly including a runner and a shaft, fusible means for securing the runner to the shaft, a sleeve separate from the runner but abutting therewith and surrounding the shaft leaving an annular space between the sleeve and the shaft, and means including a fusible metal filling said annular space for securing said sleeve to the shaft.

8. In combination, a pump runner assembly including a runner provided with a hollow hub adapted to receive the end of a drive shaft, a sleeve surrounding said shaft and bearing against the shaft at a plurality of positions leaving an annular space between said positions, and means consisting of heat-conducting material for securing the shaft to the sleeve, also to the hub and for filling said space.

9. In combination, a piunp runner assembly including a runner provided with a hollow hub adapted to receive the end of a drive shaft, said shaft having a shoulder remote from the hub, a sleeve surrounding said shaft and positioned between the shoulder and the hub, said sleeve being spaced from the shaft except in a limited number of places where it touches the shaft, and means positioned in the space between the sleeve and the shaft for conducting heat from the sleeve to the shaft, said means consisting of heat-conducting material which also serves to secure the shaft to the hub.

10. In combination, a pump runner assembly including a runner prov ded with a hollow hub adapted to receive the end of a drive shaft, said shaft having a shoulder remote from the hub, a sleeve surrounding said shaft and positioned between the shoulder and the hub, said sleeve being spaced for practically its entire length from said shaft, and means consisting of heatconducting material positioned in the space between the sleeve and the shaft for conducting heat from the sleeve to the shaft, said heatconducting material also constituting means for securing the shaft to the hub.

11. In combination, a pump runner assembly including a runner and a shaft, a sleeve surrounding the shaft and bearing against the shaft in a limited number of positions leaving an annular space at the remaining positions, and means for draining excess heat from. said sleeve and for securing said shaft to the runner and to the sleeve, said means consisting of a layer of metal contained within said space and between the shaft and the runner.

12. In combination, a pump runner assembly including a runner provided with a hub having a threaded opening, a drive shaft having its inner end threaded and screwed into said opening, said shaft having a shoulder remote from the hub, a sleeve surrounding the shaft and positioned between said shoulder and the hub whereby when the shaft is screwed into the hub, the sleeve is subjected to longitudinal stress by compression between said shoulder and said hub, said sleeve being fitted tightly about the shaft except for an annular space between the regions of contact, and means including metal contained in said space for preventing the sleeve from bulging due to said stress and accompanying heat whereby excessive heat is conducted from the sleeve through said metal to the shaft.

13. In combination, in a pump runner assembly, a runner provided with a hub having therein a threaded socket with an annular recess at the outer end of the socket and a plurality of spaced keyways in the wall of the socket extending inward from said recess, a drive shaft having its inner end threaded and screwed into the socket and having a keyway adjacent its threaded end extending past the annular recess and along the keyways in the wall of the socket, a shoulder on the shaft remote from the end of the hub, a sleeve on the shaft clamped thereby between the shoulder and the end of the hub, a pouring passage being provided between the shaft and sleeve extending from the shoulder to the annular recess, and a fusible heat-conducting material filling the passage, the annular recess and said keyways whereby the shaft is locked to the hub and excess heat is conducted away from the sleeve to said shaft.

OYSTEIN JACOBSEN.