US1831411A - Pump - Google Patents

Description

Nov. 1o; 1931.v

F. DIETZ PUMP Filed Feb. 27, 1950 i Patented Nov. `10,1 1931 UNITED STATES- FRIEDRICH DIETZ, F NUBEMBERG, GERMANY FUMP Application ined February 27, leso, serial No. 431,807, 'and in Germany April 1s, was.`

an object of my invention to provide a pump of this kind which is capable of withstanding the attacks by the mechanical and chemlcal admixtures of the oil.

To this end I use in the construction of those parts of such pumps which are exposed to these attac-ks a material, which is ableto withstand abrasion and corrosion, but I may also line such parts with a material of this kind.

Pumps for conveyingl oil from oil-Wells are known to undergo rapid wear at the valves, pistons and cylinders so that they require exchanging after comparatively short operation periods. The cause of this excessive wear is partly the fine quartz sand carried along bythe oil which, together with the oil, acts like emery, grinding melting surfaces, and partly the corrosion bythe liquids admixed to the oil, and containing brine and acids. f

It has been attempted to eliminate this wear by using in the construction of the pumps special' materials such as steel and bronze alloys, hardened steel and the like. but none ofthe materials hitherto used will stand abrasion as well as corrosion.

The fitting of the pistons in reciprocating pumps, .and consequentlyy also the efciency of the pumps, is reduced by the wear to which.

Y the pumps are subjected to such` an extent Y that after comparatively short periods, often Obviously the well is laid up while the pump is being exchanged which entails another heavy loss. Y l An attempt to convey oil by rotary umps i has failed altogether notwithstanding t e use of the best material, as with the high numbers of revolution of the pistons (about 3000 times confined to less than one day.

Even if a material were produced which 4would stand abrasion, there would still be the problem lof rendering it proof against corrosion. A material fulfilling these c0nditions must be harder than quartz and must not be attacked by the chemical action of brline and other chemical impurities in the o1 v I have now found that the carbon compounds of silicon and more especially silicon carbide are better adapted for use in the construction of the wearing faces of cylinders, pi'stns and valves than any other material hitherto used. The Brinell hardness of .silicon carbide or carborundum is 10 while that of quartz is 7. The compound is further proof against the chemical action of the brine and the acids which may be admixed with the oil. On' account of its lower degree of hardness quartz cannot exert a grinding action on silicon carbide, and A'therefore the life of a pump, the working parts of which are made of or lined with silicon carbide, is

practically unlimited.

In the drawings aiiixed to this specification and forming 4part thereof several parts of a pump embodying my invention are illustrated diagrammatically by way of example.

In the drawings Fig. 1 is an axial section of a pump,

Fig. 2 is an axial section of a slightly modifled piston, and L F ig. '3 is an axial section of a flap valve in which the valve body and the seat' are lined with silicon carbide. l

Referring to the drawings and first to Fig. 1, 1 is the pump cylinder, 2 is the piston, 3 :is the delivery valve at the top of the piston, 8 is its seat, 4 is the suction valve with its seat 9, 5 is the piston rod, 6 is a lining covering the cylinder'wall, and 7 is a liner in the skirt of the piston. The linings 6 and 7 and the valve seats 8 and9 are made of silicon carbide. The valve bodies 3 and et may consist of the same material.

The liner 7 of the piston 2 may be subdivided into a plurality of rings 10 as shown in Fig. 2, this-arrangement being generally preferable to a liner made in one piece.

In F ig. 3, 13 is a flap valve which is hinged to a seat 14 at 15. The valve is lined with a plate 1l, the seat with a bushing 12, both 10 made of silicon carbide.

lVhile I have speciiically referred to silicon carbide or carborundum as being adapted for the purpose of this invention, obviously other materials having similar properties,

15 for instance other carbides of great hardness and. high resistivity against corrosion may be used to replace it. In all cases, a binder of' ceramic character or a metallic binder may be used in the moulding of the parts in question.

I Wish it to be-understood that I do not desire to be limited to the exact details of construction shown and described for obvious modications Will occur to a person skilled in the art.

In the cla-imsaiiixed to this specification no selection of any particular modification of the invention is intended to the exclusion of other modiications thereof and the right to subsequently make claim to anymodiication not covered by these claims is expressly reserved. l

I claim: l. Pumping device comprising a piston the Working surface of Whichconsists of silicon carbide.

2. Pumping device comprising a piston and cylinder the Working' surfaces of which consist of silicon carbide.

40 3. Pumping device comprising a cylinder lined With silicon carbide.

4:. Pumping device comprising a oylinde and piston lined with silicon carbide.

5. Pumping device comprising a piston and rings of silicon carbide on said piston.

6. Pumping device comprising a. valve partly consisting of silicon carbide.

7. A pump forl fluids containing sand and the like,` comprising parts constructed of carbon compounds of silicon having a hardness greater than that 'of said sand, the said parts being such as are subjected to mechani-V cal Wear from said sand.

8. The pump of claim 7 in which the carbon compound used in the construction of said parts is silicon carbide.

In testimony whereof I aiix my signature.

FRIEDRICH DIETZ.

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