US718808A - Non-rotative pumping-engine. - Google Patents

Description

No. 718,808 PATENTED JAN. 20, 19031 I L. DAURIA.

NON-ROTATIVE PUMPING ENGINE.

APPLIOATION FILED MAY 8, 1901.

m MODEL.

UNITED STATES PATENT QFFICEQ LUIGI DAURIA, OF PHILADELPHIA, PENNSYLVANIA.

NON-ROTATIVE PUMPING-ENGINE.

SPECIFICATION forming part of Letters Patent No. 718,808, dated January 20, 1903.

Application filed May 8, 1901.

To all whom it may concern:

Be it known that I, LUIGI DAURIA, a subject of the King of Italy, (having resided in the United States during the past twenty-five years and having declared myintention of becoming a citizen of the United States,) residing in Philadelphia, Pennsylvania, have invented certain Improvements in Non-Rotative Pumping-Engines, of which the following is a specification.

My invention consists of certain improvements in the hydraulic compensator for nonrotative pumping-engines heretofore invented by me, one example of such hydraulic compensator being shown in my Patent No. 493,153, dated March 7, 1893, and another being shown in my application for patent filed July 21, 1899, Serial No. 724,665.

The object of my present invention is to furnish means whereby non-rotative pumpingengines provided with my hydraulic compensator may be permitted to change their speed and therefore their pumping capacity within wide limits without necessarily changing the grade of steam expansion or the pressures upon the engine and pump, and therefore without affecting the steam economy. This object I attain in the manner hereinafter set forth, reference being had to the accompanying drawing, which represents in side elevation a non-rotative pumping-engine of the type shown in my application forpatent, Serial No. 724,665, before referred to, with my present improvement in the compensator applied thereto.

In the drawing, 1 represents the high-pressure steam-cylinder of the pump; 2, the lowpressure steam-cylinder of the same; 3, the pump'cylinder; 4, the compensating cylinder; 5, the rod carrying the steam-cylinder pistons, compensating-cylinder plunger, and pump-plunger, and 6 the flow-pipe communicating with the opposite ends of the compensating cylinder.

The action of the compensator is fully set forth in my former patent, and hence it will not be necessary to describe the same in this specification further than to say that the back-and-forth flow of the liquid through the flow-pipe 6 under the action of the reciprocating plunger in the compensator-cylinder has the effect of equalizing the operation of Serial No. 59,269. (No model.)

the pump when the steam is employed expansively and renders unnecessary the use of any fly-wheel or other balancing agent.

I have ascertained that a by-pass extendwhen fully open, and L the length of said by-pass. Then with the by-pass shut the piston speed under fixed conditions of steam expansion will be a minimum and proportional to the square root of the ratio A divided by L, and with the by-pass fully open the piston speed will be a maximum and proportional to the square root of the sum of the ratios A divided by L and A divided by L. With the addition of other by-passes Whose full areas and length are represented, respectively, by A L A L &c., the maximum piston speed with all by-passes open will be proportional to the square root of the sum of the ratios A divided by L, A divided by L, A divided by L A divided by L 850. 1

The above law does not take friction into consideration, but is sufficient in practice to determine the proper dimensions of the bypass or by-passes to obtain a given maximum piston speed when the minimum is given.

To obtain the object of my invention I proportion the area of the plunger and the reciprocating liquid column of the hydraulic compensator, so that with a grade of steam expansion corresponding to the best steam economy of the engine the piston speed shall be a given minimum, and I connect the chamber of the hydraulic compensator on one side of the plunger with the chamber on the other side of said plunger by means of a valved bygrade of steam expansion of the engine. It is obvious that the by-pass should be so proportioned as to length and internal area that when its valve is fully opened the column of water in said by-pass shall have the same oscillatory period as that of the column in the main compensator-pipe. In the drawing the by-pass is shown at 7 and its valve at 9. The valve is preferably of the balanced type and operated automatically by a pressure device communicating with the pump, so that the valve will be opened or closedin accordance with decrease or increase of pressure in the delivery-chamber of the pump in order to maintain a substantially uniform pressure of delivery by varying the speed of the engine to accord with the demands upon the pump.

Any ordinary form of diaphragm or piston regulator may be employed, the casing of one such form of regulator being shown at 10 in communication with the air-chamber 11 of the pump and .the stem of this regulator acting upon a lever 12, which is connected by a rod 13 to the stem of the valve 9, a pullspring 14 acting upon the lever 12 in opposition to the action of the pressure device thereupon. lVhen the pump delivers into a stand-pipe or reservoir in which a constant level is to be maintained, a fioat may take the place of the pressure device, said float acting so as to close the valve 9 When the desired level has been attained and to open said valve when the level falls.

Having thus described my invention, I claim and desire to secure by Letters Patcutl. The combination of the compensator-cylinder of a non-rotative pumping-engine, with a by-pass connecting the opposite ends of said compensator-cylinder and avalve in said by pass whereby the area of the passage through the by-pass may be regulated according to the demands upon the pump, substantially as specified.

2. The combination of the compensator-cylinder of a non-rotative pumping-engine, with a valved by-pass connecting the chamber on one side of the compensator-plunger with the chamber on the other side of the same, and means for automatically operating said bypass valve to increase or decrease the speed of the engine in accordance with the demand upon the pump, substantially as specified.

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

LUIGI DAURIA.

Witnesses:

F. E. BECHTOLD, J 0s. I-I. KLEIN.

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