US685936A - Valve mechanism for pumps, &c. - Google Patents

Description

Patented Nov. 5, |90I. P. F. UDINE.

(Applctin led Apt. 29, 1901.)

VALVE MECHANIS'M EUR PUMPS, &c.

` (No Model.)

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nTnNT VALVE MECHANISM FOR PUMPS, 84C.

SPECIFICATION forming part of Letters Patent No. 685,936, dated November 5, 1901.

Application filed April 29,1901. Serial No. 58,034. (No model.) j

T0 tZZ whom t may corr/cern.-

Be it known that I, PHILIP FRANCIS ODDIE, a subject of the King or Great Britain and Ireland and Emperor of India, residing in Wi1nbledon,England,haveinventedlmprovements in Valve Mechanism for Pumps, dac.,

of which the following is a specification.

The main object of myinvention is to provide fluid-pressure valves, and more particularly suction -valves of hydraulic p umps, with means whereby the fixed stops commonly employed for limiting the lift of the valves` may be dispensed with and the degree of lift In the accompanying drawings I have shown myinvention as applied to the suction-Valve of a hydraulic pump; but I do not limit myy Vthile I do not wish to;

invention thereto. confine myself thereto, I have in the present invention shown the means for lifting the suction-valve of the pump as consisting of an2 auxiliary pump driven from the pump-shaft and in such a way that it acts slightlyin ad- Vance of the main piston or pistons, so that the pressure for lifting the suction-valve againstits spring or other closing-load is presentbefore the pump-piston begins its suctionlift.

begins, and therefore the pump will work more rapidly than pumps whose suctionvalves are opened solely by atmospheric pressure. My present invention is therefore specially adapted for use in high-speed pumps.

In the accompanying drawings, Figure 1 is avertical section of a single-acting suction and force pump provided with myinvention. Fig. 2 is an enlarged sectional view of a detail.

Figs.3, 4, and 5 are enlarged sectional views ofA modifications.

From the shaft d of the main pump blau auxiliary pump d is operated by means of a crank or eccentric c. This pump d is adapt- Oonsequently the suction-valve will open very quickly as soon as the suction-litty ed to draw fluid (water, oil, or even air) from a receptacle g through a suction-valve j' and to then force the liquid, in the downward movement of its piston 7L, through a conduit t' against the under side of a piston Z, carried hy the suction-Valve k of the main pump. This piston l, which works in a cylinder m, is loaded by means of a coiled spring n, acting to closethe valve. As illustrated more fully in'Fig. 2, this spring is inclosed in the same cylinder in which the piston Z works, the spring acting upon the upper side of the piston. The spindle connecting the piston and the suction-Valvcslides in a guide o, so that these moving parts and the spring are completely inclosed and protected from injury and from having their movements interfered with by any materials drawn through with the liquid being pumped.

The crank c, controlling the auxiliary pump, is arranged on the shaft c with reference to the main crank of the pump in such manner that the auxiliary pump will begin its pressure or forcing movement before the pumppiston begins its suction movement.

At a 'suitable point between the suction- Valve and the auxiliary pump there is provided an outlet-valve to allow of the escape ofthefexcess of duid-pressure which acts to lift the suction-valve. In the drawings I have represented this escape-valve as a valve p, arranged on the conduit 11,'thisvalve being loaded by suitable adjustable means,such as changeable weights or an adjustable spring q, so that the valve may be regulated to lift and allow the fluid to escape at any desired pressure. From the space above this escapevalve p leads a pipe r, which in the drawings is represented as leading to the hearings of the main shaft or; butit may discharge into or at any suitable point-as, for instance, backinto the receptacle g.

iVhcn the auxiliary piston 7L of the auxiliary pump begins its downward or forcing movement, it forces the duid which has been drawn into the cylinder CZ through the conduit and to the underside of the suctionvalve piston Z. Owing to this pressure the suction-valve 7c will open immediately that pump-piston l) begins its suction-lift, the loading-spring a being compressed. As soon as the huid-pressure acting on the under side of this piston Z has passed acertain point and the suction-valve 7c has consequently been lifted or raised to the desired point the escape-valve p will open and allow the fluid further supplied by the auxiliary pump to escape through the conduit r, so that the suction-valve la will not rise farther, and its lift is thereby limited. It Will be obvious that by changing t-he load upon the escape-valve p it will be easy to regulate the lift of the suction-valve 7c according to the desired extent of opening or according to the conditions of pressure in the pump.

In order to limit the maximum lift of the suction-valve 7s, I may provide in the sides of the cylinder m ports 25, through which the pressure fluid can pass out when the piston has risen to its maximum point of lift and has opened these ports t. The fluid which thus escapes through these ports will run through the inclosing casing u and thence through a pipe n back to the receptacle g.

The liquid escaping at the valve p may be employed for lubricating the shaft-bearings or by keeping the shaft floating in its bearings by means of the pressure fluid, as is assumed in the example represented.

As compared with the fixed or adjustable stops hitherto used for limiting the lift of valves the present invention has the advantage that the extent of the lif't of the valve may be adjusted or regulated from the outside without interrupting the operation of the pump or other apparatus-that is to say, by simply changing the load upon the escape-valve p. In prior constructions in order to change the lift of the valve it was necessary to open the valve-box, and consequently the Working of the apparatus had to be interrupted. A further advantage of my invention consists in this,that the shocks due to the striking of the valves against the stops are avoided, and consequently the apparatus will run more quietly and with less wear. d

The escape-valve may be placed at another point than in the pipe z'-for instance, at the cylinder m or in the piston of the auxiliary pump or in the piston of the suction-valve so long as it is arranged to provide for the escape of the pressure fluid when a cert-ain pressure or a certain lift of the suction-valve has been attained.

In the modification shown in Fig. 3 the escape-valve p is placed at the cylinder m, in the modification shown in Fig. 4 the escapevalvep is placed at the piston of the auxiliary pump, and in the modification shown in Fig. 5 the escape-valve p is placed in the piston of the suction-valve.

I claim as my invention- 1. The combination ofthe valve of a pump or other fluid-pressure apparatus with means and means for allowing the excess of said pressure fluid to escape when the valve has lifted to the desired extent, substantially as described.

2. The combination of the suction-valve of a pump and a spring for closing it to its seat with means for applying fluid-pressure to lift the valve and means for allowing excess of said pressure fluid to escape when the valve has lifted to the desired extent, substantially as described.

3. The combination of the suction-valve of a pump and a spring for closing it toits seat with means for applying fluid-pressure to lift the said valve and an outlet-valve having adjustable loading devices to regulate the escape of excess of pressure fluid, and thereby the degree of lift of the suction-valve, substantially as described.

4. VThe combination of the suction-valve of a pump with means for applying fluidpres sure to lift said valve and means for allowing said pressure fluid to escape when the valve reaches its maximum lift, substantially as described.

5. The combination of the suction-valve of a pump, a piston connected thereto, and a cylinderin which the piston moves, with means for applying fluid-pressure to the piston to lift the valve, said cylinder having discharge-V openings to let the pressure fluid escape when the piston and valve reach their maximum lift, substantially as described.

6. The combination of the suction-valve of a pump and a spring for closing it to its seat with means for applying fluid-pressure to lift the valve, means for allowing excess of said pressure fluid to escape when the valve has lifted fo the desired extent and a conduit leading from the fluid-escape outlet to the bearings for lubrication, substantially as described.

7. The combination of the cylinder, piston and suction-valve of a pump and a spring for closing said valve to its seat with an auxiliary pump driven from the pump-shaft but set to act slightly in advance of the main piston, a fluid-conduit leading from the auxiliary pump to the suction-valve to lift the latter and an escape-valve loaded to open on excess of pres sure between the auxiliary pump and suctionvalve, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

PHILIP FRANCIS ODDIE.

Witnesses:

JOHANNES HEIN, WOLDEMAR HAUPT.

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