US1624466A - Screw pump - Google Patents

Description

April 12, 1927" LQ J; BLACK ET A'- SCREW -PUMP Filed Sent. 16. 1926 2 Sheets-Sheet l L. J. BLACK ET AL April 12, 1927.

SCREW PUMP Filed sent. 16. 192e 2 Sheets-Sheet 2 'll/z M u. l

gnou/mfom, Zao

EE. SW

Patented Apr. 12.1927.

uiu'rany STATES PATE-Nr OFFICE.

LER .1. BLACK Nn ERNEST E. sworn, or imminent. l'rnxas;

SCREW PUMP.

Application med s'epteiiiberic, 1926. seriai No. 135,871.

This invention'relates to screw pumps and more particularly to -a deviceof this char- .acter employing opposed screws as a'means fdr generating water pressure. y, 0 p An important object of the invention is to provide a device of this character wherein the screw may be readily replaced and Wherein the mountings of the screw are readily acceible for removal or repair.

A further object of the` invention is to provide the chamber in which the screw yoperates with a removable liner and a novell A still further object of the invention is to generally .improve the structure of this type of (pumps, so that they may be more readily an cheaply manufactured and more readilyrepaired. 4 i

.These and. otherobjects' we attain lby the vconstruction shown in the accompan ing drawings, wherein for the purpose of i lustration is shown a preferred embodiment of our inventionrand wherein Figure 1 is a longitudinal sectional vieW through a pump constructed in accordance with our invention;

Figure 2 is a central transverse sectional view therethrough. v

Referring -now more particularly to the drawings, the numeral 10 generally ydesig-` f -nates a pump barrel having removable heads 11 at opposite ends thereof. Within the barrel, a liner support 12 is maintained in spaced relation to the walls ofthe barrel andlhas its endsv spaced from the adjacent Aheads 11. rlhe central portion 13 of this liner support has a hexagonal bore, while the ends thereof have a circular bore 14 equal to, the circumscribedA diameter of the hexagonal bore 13. A liner 15 is provided `in the form of a sleeve, the exterior of which is hexagonal at its central portion 16, and its within the' hexagonal portion 13 of the bore of the liner support. The ends of the liner are exteriorly rounded and oppose the walls of the circular bore .of the liner support in spaced relation thereto to provide a packing space. 17.

These packing spaces appear at of the liner support by adjusting screws 18 threaded through the headsv 11 and held in posit-ion by lock nuts 19. The heads-11 are each provided with a bore 20 co-axial with the bore of the liner and through this bore .extends a packing gland 21 having at its inner end a Harige 22 abutting the inner face of the Iassociated head through a lead or other suitable gasket, indicated at 23. The outer end of the gland is exteriorl threaded at 24 for the reception of a loc nut 25, by means of which the flange of the gland may be drawn tightly against the gasket 23. ",lhese threads likewise serve to provide the mounting for aveap 26 by means of which the gland fol1ower'27 is moved inwardly against the packing'2y8. 1

These glands rotatably support the smaller outerends 29 of a shaft30. rl`he shaft has anenlarged central portion 3l and be-l tween this central portion and the outer ends .29 an intermediate portion 32 upon which the Worms 33 are mounted. 34 produced upon the shaft between the enlarged central portion 31 and intermediate portions 32 provide limits regulating the approach of worms 3 3 toward the center of the shaft and the shaft has threaded portions 35 for mounting lock nuts 36 which serve to maintain the worms against these shoulders. The worms are suitably keyed to the shaft, as at 37. The liner 15 is provided centrally The shoulders with an inwardly projectinglange 38 exl tending adjacent the surface of the enlarged portion 31 of the shaft. This flange is slotted at 39 to provide a passage which is directed outwardly toward anoutlet o n# ing 40 which is projected through the liner carrier and the outer wall of the worm, as indicated. The Worms 33 are preferably produced uponl trunco-conical cores 41, the base or larger ends of which abut the shoulders 34 and oppose the flan e38.` These base ends'are of slightly' less iameter than the bore of the liner at the large ends thereof and have produced thereon a worm thread 42 which comes into close contact with the inner wall of the bore throughout its length. Since the space between the face of the core and the wall of the bore decreases toward the center of the linerit will follow that each end of fluid passingy between the worms will be 11 compressed during its passage and accordingly under considerable pressure when it reaches the flange 38. l The face of the worin in its coaction with the flange acts more or less as a valve alternately cutting off and permitting communication between the fluid space and the opening 39, thus permitting j the pressure to build up to a still higher lll point. The inner end of the slot 39 is aligned with the adjacent ends of the cores fil, so that the formation about the shaft between these cores of a dead water space is eifectually prevented. The walls of the opening 39 further serve to break up the tendency of fluid received from the worm to rotate and direct this fluid to the outlet. lt will, of course, be understoodthat fluid entering the barrel of the pump will till the space within the barrel and enter at the outer ends of the worms.

pump of this character may be very readily assembled or disassembled when any repairs are necessary. 1f, for example, it

is necessary to renew the screws and liners, it ismerely necessary to unbolt the heads ll and remove them from the body ofthe pump. This will release the worms 33 and glands 17 and the packing may be pulled from about the liners. The entire liner, with its assemblage of the shaft and worms, may then be bodily withdrawn from the pump for repair. To remove the liner from the shaft, it is then merely necessary to remore one of the worms 33. Out-bearings 43 may be provided for the projecting ends of the shaft and where provided, these willbe carried by the heads 11, so that they may be removed therewith. j

It will be obvious that the construction hereinbefore set forth is capable of a certain range of change and modification without materially departing from the spirit of the invention and we accordingly do notlimit ourselves to4 such specific structure except as hereinafter claimed.

l. In a screw pump,.a barrel having heads at least. one of which is removable. a shaft rotatably directed through said heads, a liner support within the barrel and surrounding the shaft, 'a liner sleeve supported by the liner support and4 likewise surrounding the shaft and having engagement with the supportcentrally thereof whereby it is held against rotation with relation to the support, the adjacent faces of the end portions of the sleeve and support being spaced to provide packing spaces,. followers engaged in the'ends of the packing spaces, means adjustable through said heads for shifting the followers and spaced opposed i worms mounted upon the shaft within the sleeves 2. ln a screw pum a barrel having heads at least one of whic Vis removable, a Shaft rotatably directed through said heads, a liner support within the barrel and surrounding the shaft, a liner sleeve supported by the liner support and likewise surrounding the shaft and having engagement with the support centrally thereof whereby it is held against rotation withrelation to the supporti, the adjacent faces of the end portions of the sleeve and support being spaced to providepacking spaces, followers engaged in the ends of the packing spaces, means adjustable through said heads for shifting the followers, spaced opposed worms mounted upon the shaft within the sleeve, the barrel having an inlet and an outlet. the outlet communicating with the space between the worms, the inlet communicating with the ends of the sleeve and means supported by the sleeve and surrounding the shaft between the worms preventing rotation of fluid about the shaft at the outlet and directing the fluid to the outlet.

3. In a screw pump a barrel having heads at least one of which is removable, a shaft rotatably directed through said heads, al liner support within the barrel and surrounding the shaft, a liner sleeve supported by the liner support and likewise surrounding the shaft and having engagen'ient with the support centrally thereof whereby it is held against rotation with relation to the support, the adjacent faces of the end portions of the sleeve and support being spaced to provide packing spaces, followers engaged in the ends of the packing spaces, means adjustable through said heads for shifting the followers, spaced opposed worms mounted upon the shaft within the sleeve,

' ythe barrel having an inlet and an outlet, the

outlet communicating with' the space bey tween the worms, the inlet con'miunieating;l with the ends oli-the sleeve, means supported by the sleeve and surrounding the shaft between the worms preventing rotation ofi fluid about the shaft at the outlet and directing the fluid to the outlet comprising a flange having an o ening for the passage of the shaft and a ra ial notch communicating with the outlet.

4. In a screw pump, a barrel having heads at least one of which is removable, a shaft rotatably directed through said heads, a. liner support within the barrel and' surrounding the shaft, a liner sleeve supported by the hner support and likewise surround. ing the shaft and having engagement with the support centrally thereof whereby it isheld against rotation with relation to the support, the adjacent faces of the end ,por-

tions of the sleeve and support being spaced 1 to provide .packing spaces, followers engaged -in the ends of the packing spaces, means adjustable through said heads for shiftingV the followers and spaced opposed worms mounted upon the shaft within the sleeve, adjacent ends of said worms having engagement with the liner preventing longltudmal movement thereof.

. Iu a screw pump, a barrel having heads held against rotation with relation to thesupport, the adjacent faces of the end portionsof the sleeve and support being spaced to provide packing spaces, followers engaged in the ends of the packing' spaces, screws adjustably drectedthrough said heads and having their inner ends abutted against the adjacent followerl and spaced opposeduwormsmounted upn the shaft wit-hin the sleeve.

6. In a screw pump, a barrel having heads at least one of which is removable, a shaft rotatably directed through said heads, a liner support within the barrel and sur.- rounding the shaft, a liner sleeve' supported by the liner support and likewise surrounding the shaft, said support and sleeve having coacting polygonal central portions engaging to prevent relative rotation thereof` the ends of the opposedl faces of the support and sleeve'being circular and being spaced from one another to provide annular packing spaces, follower rings inserted in the ends ofthe packing spaces, means adjustable through the heads and engaging the packing rings and spaced opposed :worms mounted upon the shaft within the sleeve.

7 In a screw pump, a barrel having heads at least one of which is removable, a shaft rotatably,a directed through said heads, a liner @support within the barrel and surrounding the shaft, a liner sleeve supported by the liner support and likewise surrounding the shaft, said support and sleeve-having coacting polygonal central ortions engaga5 ing to prevent relative rotation thereof, the n ends of the opposed faces ofthe support and ,sleeve being circular, and'being spaced lfrom onel another to provide annular packing s aces, follower rings inserted in the ends o'tl tie packing spaces, means through the heads and engaging the packingv ringsand spaced opposed worms mounted upon the shaftwithin the sleeve, the sleeve having a central flange one edge of which is extended into proximity to the shaft, said flange having a radially directed notch. y

8. In a screw pump, a barrel having heads at least one of Vwhich is removable, a shaft rotatably directed through said heads, a

liner support within the barrel and surrounding the shaft, a liner sleevesupported by the liner support and likewise. surrounding the shaft, said support and sleeve havingcoacting polygonal central portions enadjustable gaging tol prevent `relative `rotation thereof,

the ends of the opposed faces of the support and sleeve. being circularl and being spaced from one another to provide annular packing spaces, follower ,rings inserted in the ends of the ackng spaces, means adjustable through t e heads and engaging the packing rings and spaced opposed worms mounted upon the shaft within the sleeve, the sleeve having a centralflange one. ledge of which is extended into proximity to the shaft, said flange having a radially directed notch, said worms having frustro-conical cores the larger ends of which are opposed lto the ang'e, the base of the notch aligning with th'e adjacent edge of the core.

In testimony whereof we affix our signatures. LEE J BLACK.

' ERNEST E. SWOPE.

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