US2234142A - Pump liner - Google Patents

Description

March 4, 1941. w. T. JANNEY ET AL PUMP LINER Filed July 2'7, 1957 IN YE N TORS. H574 75R [kw/van WVX/M/L L mm #Somews EN,

Patented Mar. 4, 1941 UNITED .STATES' PUlWP LINER Walter T. Janney and Maximillian H. Sorensen,

Philadelphia, Pa.', assignors to, J anney Cylinder Company, Philadelphia, Pa a corporation of Pennsylvania Application July 27, 1937, Serial No. 155,936

. 4 Claims.

This invention relates to pump liners, a'nd'particularly to a composite pump liner for slush pumps and the like used in the oil industry;

It is well known that slush or sludge pumps are I designed to circulate a fluid mud which is pos sessed of a high abrasive factor normally effective to preclude any but a short life for the pump. For this reason it has become necessary to provide separable and renewable liners for such pumps that can be removed a'nd'replaced as desired, although obviously such renewing is at considerable cost. Unfortunately the abrasive factor is accompanied by others requiring entirely different characteristics in the liner, namely, great strength to resist the shocks of pumping. Obviously the abrasion resisting and strength characteristics are two antagonistic factors incapable of satisfactory solution by the same metal.

It is among the objects of this invention to provide a liner possessed of great strength as well as high resistance to abrasion; to provide a composite liner with means preventing undesired separation of the elements thereof; to provide a steel lining shell with a welded steel ring engaging an end of a brittle abrasion-resisting inner member to prevent relative axial movement of the parts in one direction; and many other objects and advantages as will become more apparent as the description proceeds.

The pump, not shown, of any conventional design is arranged to receive the composite insert comprising an outer jacket of high tensile strength and high elongation, with an inner sleeve of high wear resistance having substantially no elongation and only moderate tensile strength, with means anchoring the parts against axial relative movement.

In the accompanying drawing:

Fig. 1 represents a vertical longitudinal section through a compound liner according to this invention, and

Fig. 2 represents a fragmentary enlarged longitudinal vertical section through the end of the assembly disclosing the anchoring portions.

The compound liner has an outer shell I0 preferably of high physical strength, but of low abrasion resistance, and of high elongation, and illustratively, made of steel. It may simply be of soft steel unsuitable for abrasion resistance. One end may be threaded as at H to receive the threaded flange [2 by which the compound liner is secured in the pump, as will be readily understood. The end l3 opposite to the threaded end is provided with the reduced inner periphery or counter-bore I 4 terminating internally in the shoulder-l5 and externally in the inclined or chamfered surface 20.-

The inner sleeve H5 is preferably of heat treated cast iron which is hard andpossessed of high abrasion resistance but low physical strength and has an enlarged flange like portion, head or bead I! of a size to fit in the counterbore l4, and has a shoulder I8. The inner hard, and generally brittle, sleeve I6 is slid axially into the outer sleeve in substantially intimate physical contact therewith throughout their common'length, with the beadl l in the axial recess I4, with the shoulder [8 engaging shoulder I5 of the outer housing or strengthening sleeve Ill. It will be apparent that the interlocking shoulder engagement securely anchors the inner and outer sleeves together against relative axial movement in one direction only, and the parts can be axially disengaged in the other direction unless otherwise prevented.

To anchor the parts against such axial disengagement the counterbore I4 is prolonged beyond the end of the bead I1 and, preferably, merges into the inclined chamfer 20 in .the end I3 of the strengthening sleeve. A short relatively soft steel ring 2| of such diameter as to have a sliding fit in the steel outer cylinder abuts the end of the bead or enlarged head I! of the hardened abrasion resisting inner member l6, and has a cooperatively chamfered surface 22 meeting inclined surface 20 in an oblique angle. The ring is of such material as conduces to welding of the ring to the outer shell, and the welding 24 rigidly anchors the ring in the shell.

Obviously the inner member is thus anchored at a single end to the outer shell so that elongation of the outer shell relative to the inner sleeve develops no shearing strains, no tensile stresses are developed, and the effective inner and outer diameters of the pump entering end of the composite sleeve or liner are the .same as the main body thereof. This latter is an important factor, as the liner must be capable of axial insertion in the pump (not shown) and variations in diameter would interfere with such sliding insertion.

It is pointed out that the anchoring association is secured without subjecting the hardened inner sleeve itself to welding or other stressing action which might crack same, and being clamped at one point or end can slide with the anchor point as the outer shell elongates or shrinks according to conditions in operation.

We claim: v 1. A compound liner comprising a shell of material of high tensile strength and elongation having a counterbore, a sleeve shorter than said shell and of high resistance to, abrasion having a shouldered head of a diameter to seat in the counterbore, said sleeve telescoping with said shell tobring said shoulder" against the end-of the counterbore and forming anannularspace at the outer end of said counterbora. a ring in relative axial movement in the other direction. 2. A compound. liner comprisinga strong vsteel shell of low abrasion resistance, and having a-- counterbore, a hardenedcast iron sleevehaving" an enlarged enddisposed in the .shell with the enlargedend in the counterbore-and leaving a space from the end of the shell, a -steel ringin the counterbore'abutting the sleeve end and of a length substantially equal-to said 'spaceand havingthe sameinternal diameter asthe sleeve, said ring and shell being welded together throughoutthe peripheral extentof the ring to absorb stresses on said ring evenly.

3. Aucompound liner comprising a-strong :steel shell of W abrasion resistance having a counterbore-with its end internally chamfered in communication with the counterbore, a hardened cast iron sleeve having an enlarged end in the counterbore, a steel ring in the counterbore abutting the sleeve end and of the same thickness as the enlarged end and having an internal diam- ,eter the same as that of the sleeve to form an effective extension thereof and being axially of a length such as to substantially fill the space from said sleeve end to the endofjthe counter- .bore, said ringhaving an externally chamfered end forming with the, ch-amfer of the steel shell an annular gutter, and welding material in said gutter to weld the ring and shell together throughout'their adjacent end peripheries.

4.1.A compound liner comprising a tubular shell-offhightensile strength and elongation formed with'acounterbore at one end, said shell having a length substantially equal to a selected piston cylinder; a cast iron sleeve shorter than said shell and having an annular flange at one end -'of-'-a diameter to fit within said counterbore and-ofa thickness to leave an external annular space inssaidcounterbore when said sleeve is

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