US452726A

US452726A - Rotary pump

Info

Publication number: US452726A
Authority: US
Publication date: 1891-05-19
Anticipated expiration: 1908-05-19

Description

N'. N'ILSON.

ROTARY PUMP (No Model.)

No. 452,726. Patented May 19, 1891.

@MWew UNITED STATES PATENT OEEICE.

NILS NILSON, OF MINNEAPOLIS, MINNESOTA.

ROTARY Pu M P.

SPECIFICATION forming part of Letters Patent No. 452,726, dated May 19, 1891. Application iiled December 19, 1887. Serial No. 258,279. (No model.)

T0 all wto'n't it Hefty concern:

Be it known that I, NILs NILSON, of Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Rotary Pumps, of which the following is a specification.

My invention relates to rotary pumps with usual inlet and outlet ports and avalve opening and closing the outlet-port acted upon by an eccentric cylindrical piston.

The object of my invention is to simplify the construction of such pumps, diminish the cost, diminish the friction and wear' of parts, and thereby economize lthe power and increase the durability and efficiency of the pump.

My invention consists, generally, in the combination, in a rotary pump, of a rotating cylindrical piston mounted upon an eccentric core or axis, so as to roll upon the inner surface of the pum p-barrel in one direction while being carried in an opposite direction by the turning of the shaft.

The invention also consists in a swinging valve attached to the pump-barrel, riding upon the piston and alternately opening and closing the outlet-port of the pump, the pump being adapted for use'either as a suction or` force pump by the addition of aproper valve in either the inlet or outlet to prevent a return-flow of the iiuid without difference in construction, as clearly appears from the accompanying drawings and following description.

specification, Figure l shows the interior and working parts of my improved pump exposed to view by the removal of the head of the pump-barrel. Fig. 2 represents a vertical cross-section, and Fig. 3 a longitudinal section, of the same.

In the drawings, l represents the pumpbarrel with its inlet-and outlet ports 9 and l0, and recessed at 1l to receive the swinging valve 7.

3 is the pumpshaft concentric with the pump-barrel, iiattened to iit into a slot in the eccentric cylinder 4, the eccentricityof which is adjusted by the set-screw 5, passing through the cylinder into the slot, carrying upon its point a plate 14:, covered with a strip of packing 6, and pressing this against the shaft.

In the said drawings, forming a part of this 12 is the rotary piston concentric with the cylinder 4 and turning upon it as its axis, and rolling upon the inner surface of the pump-barrel.

rllhe action of the pump in operation is as follows: The set-screw 5 being adjusted so as to cause the piston .to bear upon the barrel of the pump, the shaft 3, on being turned in the direction indicated by the arrow I4, carries with it the eccentric cylinder 4 and the piston l2, but the piston freely turning upon the eccentric, caused by its bearing upon the inner surface of the pu nip-barrel to roll upon the said barrel in the direction indicated by the arrow l5, the water being by the traveling of the pistou drawn in at 9 and forced out at lO. The swinging Valve 7, hinged at 8, always rides upon the surface of the piston, being held in such position by its own weight or by a spring 13 or other equivalent device. The valve is grooved on its upper surface, as shown, and fits loosely,-so that all the fluid as forced toward it finds free vent through the space in said recess and through the groove out of the port while the valve is in the act of closing, thus avoiding increased friction fromthe resistance of confined fluid. As the piston rolls forward it lifts the valve into its recess, and in passing allows itto drop back and reopen the port. By the set-screw 5, as indicated, the eccentric can be nicely adj usted, so that the piston will fit in and roll upon the inner surface of the barrel and compensation be made for'the gradual wear of parts. By the rolling instead of sliding of the piston friction between it and the pumpbarrel is almost wholly eli-miminated, while the direction of the turn of the piston makes the friction against thevalve slight, and the wear of the valve in no way affects its working efliciency.

What I claim as my invention, and desire to secure by Letters Patent, isy In a rotary pump, the combination, with the pump-barrel fitted with ports and valve, of an eccentric cylinder 4, formed with one slot to receive a flattened shaft and another slot to receive the head of a screw below the periphery of the cylinder, a shaft 3, lying in the slot therefor in said cylinder, a plate 14, packing 6 between said plate and cylinder, set-screw IOO 5, having its head lying within the recess In testimony whereof I have hereunto set therefor in said cylinder and its end bearing my hund this lith day of December, 1887. against said plate, und the ring-piston 12, mounted upon said cylinder to roll upon the NILS NILSON. 5 inner surface of the pump-barrel in an opposite direction from the revolution of the In presence of# shaft, substantially as and for the purposes R. H. SANFORD, set forth. A. M. GASKELL.