US295597A

US295597A - Rotary pump

Info

Publication number: US295597A
Authority: US
Publication date: 1884-03-25
Anticipated expiration: 1901-03-25

Description

" (No Model.)

F. S. TROUTMAN.

.- ROTARY PUMP. No. 295.597;

' Patentgd Mar. 25, 1884.

' WITNESSES .11 ttorneyts N. PETERS. Phavumc m hur, wdkhiuglflm D-C.

UNITED STATES PATENT QFFICET FRANK S. TBOUTMAN, OF SENECA FALLS, NEW/V YORK.

ROTARY PUMP.

SPECIFICATION forming part of Letters Patent No. 295,597, dated March 25 1884.

Application filed March 21, 1883. (No model.)

3T0 aZZ whom it may concern:

Be it known that I, FRANK S. TROUTMAN, a citizen of the United States of America, residing at Seneca Falls, in the county of Seneca and 5 State of New York, have invented certain new and useful Improvements in Rotary Pumps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. T

This invention has relation to double-wheel rotary pumps 5 and the object is to increase the efficiency, durability, and power of pumps of this kind.

Heretofore the use of double-wheel rotary pumps having pistons with blades all of one length and sweeping the casing with their sides and ends has been attended with a great deal of wear of the operative parts, whichin a great measure is incident to the formation of a water-tightv chamber between the sides of r the casing and the blades of the piston which contact during the operation of the pump. The water restrained and confined in this chamber gives great resistance to the progress of the pistons and naturally is forced out through any interstice between the parts. The result is that the blades or casing, or both, are speedily worn to such an extent that the pump is rendered almost useless, or at least is greatly impaired in efficiency. The purpose of my improvement is to avoid this defective construction and to prevent the resultant damage to the machine. I attain these objects and purposes of my improvements by constructing the blades of the pistons plane and straight on one side, and convex or concave, or of irregular contour, on the other or contact side, and in so disposing the pistons in the casing relatively to each other that when water-tight chambers are formed between two pairs of contactingblades said chambers shall not be diminished in capacity at any time during the progress of the pistons. This is accomplished, as stated, by forming the blades plane andstraight on one side, andconvex or concave or irregular 011 the other side, and then placing the pistons in the casing so that the irregular surfaces shall be the contact-surfaces, thus leaving the intermediate chamber to be formed between the blades.

In the accompanying drawings, illustrating my improvements, Figure 1 is a perspective View of the pistons applied to a casing witha pump-stock. Fig. 2 isa side view, showing pump stock, the former of which is of the usual elliptical form, and is provided with induction and'discharge orifices, substantially as shown in the drawings in Fig. 1. On one side I) the casing is cast or made as part of the chamber, and the other side (not shown) is removable, and secured to the casing by screw-bolts, the union of the parts/being made tight by packing.

The letter B represents the pistons having journals a a fitted to and working in bearings formed in the side plates of the case. The j ournal of one of the pistons is extended and passes through the side of the case, and to this extended journal the power is applied or connected. In the drawings, Fig. 1, I have shown fixed to this extended journal a balance-wheel with a hand-grasp; but any other means giving the requisite power may be applied; and as the power revolves the piston to which it is applied, the blades of that piston engage with those of the other piston, and necessarily turn that. The blades 0 of the pistons are formed plane and straight on one side, (1, and on the other side made slightly convex or of any suitable irregular contour, substantially as seen in the drawings. The blades are of such length that there shall not be contact of their ends,

with the body of the journal between the blades of the opposite piston, in order that the frictional contact shall not be effected at these parts, and in order also that the contact-surface of the blades shall be lessened. The sides and ends of the pistons fit close to the sides and drums of the case, so that the water carried by the blades can find no discharge, except as provided for. The pistons are placed in the easing with the plane surfaces of the power-piston in-reverse of the direction of the motion, and the plane surface of the other piston set to the direction of its motion, the blades, as stated, falling short of the base of the opposite one, substantially as seen in the drawings. This plane surfaces of two 1 construction and disposition bring the irregu- 7 llar surfaces of the piston-blades in primary contact at the upper portion, as usual, from which point progression is made until the next blades meet, at which moment a water-tight chamber, D, is formed between the base of the arms, their flat faces, and the sides of the casing,which chamber, from the time of its formation, is not reduced or compressedin size; but, on the contrary,while two approaching blades are in progressive contact, or increasing their lap, the two preceding contacting blades are in retrogressive contact, or decreasing their lap; but no two blades at any time lap each other their full length, the eiiect being that the water-tight chamber is never diminished in ca- I 5 pacity, and therefore no power is wasted in overcoming a resistance of the water to compression in such chamber.

The evidences of the existence of such a watertight chamber in pumps of ordinary construction consist in the chuckin or thum ing heard during the operation of thepunip, but in pumps of my construction the operation is devoid of such evidences.

lVhat I claim as my invention, and desire to secure by Letters Patent, is

In a double-piston rotary pump, the combination, with the casing, as described, of the pistons 13, having blades 0, the contact-surfaces of which are curved and their opposite surfaces flat, said pistons being so relatively arranged that at the time progressive contact FRANK S. TROUTMAN.

\Vitnesses:

JAsrnR N. HAMMOND,

HENRY LIENHART.