US1011516A - Compound or multiple-expansion engine. - Google Patents

Description

A. STAPPEN.` v COMPOUND 0R MULTIPLE EXPANSION ENGINE.

APPLIOLTIOI FILED JULY 5, 1911.

Patented Dec. 12,1911

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UNITED srATEs gPATENT. oEErcE.

ALBERT STAPPEN, OF MNCHEN-GLADBACH, GERMANY.

COMPOUND 0R MULTIPLE-EXPANSION ENGINE.

Specification of Letters Patent.

Patented Dec. 12, 1911.

Application led J'uly 5, 1911. Serial No. 636,837.

reference marked thereon, which form a part of this specification.

This invention relates to compound or multiple expansion engines, and has for its object to provide improved means for obtaining an eiective heating of the piston or receiver. This can be obtained in a very simple manner by constructing the piston of known form as a receiver, if only the,

heated surface is kept sufciently large. This, however, is impossible in connection with the usual piston arrangement, as only the circular bottom of the piston is in contact with the steam.

My invention consists in constructing the piston as a plunger-like, stepped compound piston in which the high pressure steam, or generally speaking, the steam of the preceding cylinder, flows around the cylindrical surface of the piston. The heating surface obtained in this manner is so large that the greatest reduction in condensation by the cylinder is obtained, which is necessary to get the minimum consumption of steam and fuel.

Safety of working of the present enginel is absolutely maintained on account of the very simple construction, while in connection with receivers, which are arranged.

In the accompanying drawing Figures 1 to 4 are longitudinal sections of a cylinder and invention.

from the high pressure chamber.

piston of a compound engine embodying my Fig. 1 shows the piston in its first dead point, admission taking place in the high pressure chamber, the low pressure chamber exhausting. Fig. 2 shows the high pressure chamber exhausting into the piston and compression taking place in the low pressure chamber. Fig. 3 shows the piston in its second dead point, the high pressure chamber exhausted and admission taking place in the low pressure chamber, and Fig. 4 shows compression in the high pressure chamber and exhaust from the low pressure chamber.

In said drawing a designates the inlet valve which controls the feed pipe (not shown) that enters the cylinder l; at one end of the high pressure chamber. The cylinder b is stepped, forming-two compartments of different diameters and an interior annular abutment b which constitutes one end wall of the high pressure chamber o2.

Reciprocably mounted within the cylinder o is a piston c which is stepped on its exterior to conform to the exterior of the cylinder and has an annular exterior abut- `ment c which constitutes the other end wall of the high pressure chamber b2. The sides of the latter are formed by the portion of the cylinder having the largest diameter and by the portion of the piston having the vbetween the low pressure cylinder and the interior of the piston is controlled by a valve f arranged to control a port in-said wall o3 of the piston. This valve f is mechanically operated, by any suitable means, to admit steam to the low pressure chamber from the piston which acts as a receiver for steam The steam is exhausted from the low pressure chamber through ports g in the periphery of the latter when the piston has reached the limit of its backward stroke. The inlet for the steam may be constructed in any suitable manner, for instance as a disk or drop valve, as shown. The operation of the valve f of the receiver is effected in a manner depending upon the constructional conditions of the engine.

Steam entering through the inlet into the high pressure chamber b2 acts upon the annular surface o and drives the piston toward the end b3 of the cylinder. As soon as the piston passes the point shown in Fig. 2 steam from the high pressure chamber enters the piston through the ports d, the annular abutment b operating to distribute the steam. When the piston reaches the position shown in F ig. 3 the steam in the high pressure chamber b2 has exhausted into the piston and by opening the valve f the steam heated by the wall of the cylinder, enters the low pressure chamber and reverses the stroke of the piston, and when the latter reaches the position shown in Fig. 4 the steam begins to escape through the ports g.

I claiml. A compound engine comprising a hollow stepped piston having exhaust ports at one end, a similarly stepped cylinder controlling said ports and having exhaust port-s controlled by the piston and means to control the passage of low-pressure steam from the piston to the cylinder.

2. A compound steam engine, comprising a hollow piston having diameters of dii'erent size, a cylinder the diameters of which conform to the diameters of the piston, an admission valve at the high pressure part of the cylinder, said piston having peripheral ports in its small end portion, an admission v alve in the end of the large portion of said piston, said cylinder having exhaust ports in the low pressure portion thereof.

3. A compound steam engine comprising a cylinder -formed with compartments of different diameters and an interior annular abutment at one end of the largest compartment, a hollow piston having its exterior conforming to the cylinder, said cylinder and piston forming a high pressure chamber between their sides and a low pressure chamber between their ends, an admission valve at the compression end of the high pressure chamber, said piston having peripheral ports in its small end portion, an admission valve in the end of the large portion of the piston, said cylinder having exhaust ports in the low pressure chamber.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

ALBERT STAPPEN. [Ls] Witnesses:

ALFRED I-IENKEL, ALBERT F. NUFER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

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