US148041A - Improvement in steam-pumps - Google Patents

Description

D. DUUDS & l. H. HABTSUFF. Steam-Pumps.

Patented March 3. 1874;

WITNESSES.

AMP/lami/THUGRAPH/t 00.116 X/asnawrs IWOLESSJ UNITED STATES PATENT CFFICE.

DAVID DOUDS AND JOHN H. HARTSUFF, OF NEW CASTLE, PENNSYLVANIA,

ASSIGNORS OF ONE-THIRD THEIR RIGHT TO PERRY DOUDS, OF SAME PLACE.

IMPROVEMENT IN STEAM-PUMPS.

Specification forming part of Letters Patent No. 148,041, dated March 3, 1874; application filed July 9, 1873.

To all whom it may concern Be it known .that we, DAVID DOIJDS and JOHN HENRY HARTSUFF, both of Newcastle,

county of Lawrence and State of Pennsylvania, have invented a new and useful Improvement in Steam-Pumps; and we do hereby declare the following to be a full and exact description of the same, reference being had to the accompanying drawings forming part ofthis specification, in which Figure 1 is an elevation of our improved pump; Fig. 2 is a section through line mm, Fig. l Fig. 3 is a plan view of the lower portion of the casing with the top removed, showing the position of the suction and delivery valves; and Fig. 4 is a section through line M,

'Similar letters of reference in the accompanying drawings denote the same parts.

This invention relates to that class of steampumps in which the steam is caused to act by direct pressure upon the water, and isdirected alternately upon two chambers, having a common steam and delivery pipe controlled by tilting valves in such a manner as to direct the steam alternately upon each chamber, one

being filled with water while the other is being emptied.

It is well known that in pumps of this class their successful operation depends largely on the rapid condensation of steam in each ch'amber'after the water is expelled, toproduce a vacuum sufficient to close the stean1-valve,

cause the water to rush in, and direct the steam upon the opposite chambers. When the chamber becomes heated, however, condensation becomes more difficult in proportion to the degree of heat. Hence, in the operation of pumps of this class much difficulty is experienced and hot water cannot be pumped. Our invention has for its object to produce a pump free from such objections, which shall be rapid and efi'ectual in its operation, simple in construction, and require comparatively little steam. To this end our invention consists, first, in connecting an air-chamber or reservoir to the suction-pipe of the pump; second, in the construction of the suction-valves; and, third,

in the general construction and arrangement of parts, as I will now proceed to describe. The upper portion of the pump-casing is composed of the tapering chambers A A made in one casting, separated by a partition, A and cauling together at the top, where they open into a wedgeshaped recess, B, in which a tilting wedge-shaped valve, 0, works, and closes the entrance to the chambers A A alternately. The lower portion of the casin g is composed of a base, A, containing the suctionvalves and discharge-valve, presently to be described. The base A is bolted to the upper portion, so as to be readily detached therefrom to inspect and repair the interior. At the bottom of the chambers B B in the base A are the suctionvalves E E resting on inclined seats F, in which are the ports G G, communicating with the suction-pipe H. The valves E are held in place by casings 1, and are provided with lugs J on their outer sides, which strike against said casings and prevent the valves from opening too far, as shown in Fig. 2. The valves E E are provided with rounded lower edges, which rest in correspondingly-shaped seats K, in the bottom of the casing. L is a reservoir or air-chamber opening into the space M in the base A, between the suction-valves, and extending upward somewhat higher than the chambers A A N is a screw-plug in the top of the reservoir L, provided with a spring valve, 0, opening downward. P represents the discharge-passage, connected by ports R R with the chambers A A said ports opening into the wedge-shaped seat of the rackingvalve S, and being closed in turn by the latter.

The operation is as follows: To start the pump it is necessary to remove the screw-plug N from the reservoir L, and fill the latter, to-

gether with the chambers A A with water, the valves E E permitting its free ingress, and a suitable check-valve in the suction-pipe preventing it from escaping. The chambers A A being thus filled, and the valve 0 beingtilted so as to cover the opening in the chamber A, steam is admitted into the chamber A, as shown by the arrow, and, pressing powerfully on the water contained therein, instantly expels it through port B into the discharge-pipe P, the valve S being in the position shown in Figs. 3 and 4, and closing the port R The expulsion of the water from the chamber A is so sudden that a momentary vacuum is produced in the chamber A, which causes the valve 0 to tilt in the opposite direction and direct the steam into chamber A while water,

- chamber A is exhausted another momentary vacuum is produced, and the valve 0 again shifted and steam redirected into the chamber A. The action of the pump is therefore constant, and cannot be affected by the temperature of the chambers, as condensation of steam is not relied on to produce a vacuum, the rapid discharge from the chamber producing the desired result. The air-chamber L, connecting with the mouth of the suction-pipe, enables the pump to discharge a steady steam, and the air cook or valve 0 relieves the action of the suction-valves and prevents them from knocking too hard against their casings. The sectional construction of the pump-casin g enables it to be readily taken apart for repairs; and it will be readily seen that, as the suction and discharge valves are all contained in the base A they can be inspected and repaired by simply removing the upper portion of the casin g.

We have found by practical operation of this pump that it will throw three feet for every pound of steam-pressure, and its operation is so rapid that one hundred and twenty (120) strokes per minute have been reached. We can operate with either hot or cold water, thereby conclusively proving that no condensation of steam isnecessary to the operation of our pump. Indeed, condensation is impossible in pumping hot water. We can therefore use it successfully in feeding boilers, and for other purposes where hot water is desired. The construction is so extremely simple that particles of sand, gravel, and other obstructions can pass readily through it without injury to the working parts. This we have also found by experience. The seats of the valves E E are chilled incasting to prevent them from being cut or worn by gravel and other foreign matter passing through.

Having thus described our invention, what we claim is-- v 1. The combination of the air-chamber L, having the screw-plug N and spring-valve O, with the suction-space M and chambers A A of a steam-pump, substantially as described.

2. The suction-valves E E provided with the back lugs J and the rounded lower edges resting in sockets K, in combination with the casings I and inclined seats F, substantially as described.

DAVID DOUDS. JOHN HENRY HARTSUFF.

Witnesses:

D. K. HAUXHURST, MELVILLE CHURCH.

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