US1690126A - Reciprocating engine - Google Patents

Description

Nov. e, 1928. 1,690,126

W. NIELEBQCK RECIPROCATING ENGINE Filed Feb. 9, 1924 3 Sheets-Shet l 4 TTOENE/S Nov. 6, 1928. 1,690,126

w. NIELEBOCK RECIPROCATING ENGINE Filed Feb. 9, 1924 J5 Sheets-Sheet 3 mmma Patented Nov. 6, 1928.

f UNITED, STATES V 1,690,126 PATENT OFFICE.

a ms NIELEBOGK, or NOWAWES, NEAR BERLIN, GERMANY.

nncirnocarrme n'ivenvn.

Application fled February 9, 1824, Serial No. 691,814, and in Germany February 23, 1923.

.The invention relates to improvements in fluid controlsystems, and has particular reference to distribution valves for reciprocating double acting compound engines.

. An object of the invention is to insure a simple and reliable, reversal of the piston of the engine at the end of each stroke and the easy accessibility of the distribution valves.

The improved distribution valve arrangement is particularly suitable for feed and supply pumps. in \vhichthe driving medium has a compound action and the cylinders are arranged in tandem, for compound air compressors, in which the cylinders are arranged side by side and also for single cylinder engines. I

The control system according to the present invention is characterizedfby the feature that the auxiliaryslide valveis formed as a piston ivalve (as distinct from a stepped valve) having an extension projecting into the lower pressure cylinder, and is arranged to be moved in one direction by contact ofthe lower pressure piston with said extension and 4 in the other'direction by motive fluid.

, As hereinafter more fully described, one side of the auxiliary valve is always exposed to the pressure of the high pressure cylinder, and a separate passage serves to balance the pressureon both faces of the auxiliary valve and another separate passage serves to main 4 tain the pressure in the main valve chamber during the time that the port between the high pressure cylinder and the other end of the auxiliary valve chest is closed by the high pressure piston. I

The drawings illustrate two embodiments of my invention.

Fig. 1 shows a section through the essential parts of the driving engine of a feed pump with the cylinders arranged in tandem.

Fig. 2 is a similar view of the high pressure steam side and the low pressure air side of a com ound air compressor, the second piston set 0 which is controlled by the common valve.

Fig. 3 is an enlarged fragmentary sectional view of the left-hand portion of Fig. 2.

Similar parts are indicated by similar letters of reference throughout all the figures of the drawings.

In the drawings a indicates the high pressure cylinder, 6 the low pressure cylinder, and b, the cylinder of the air compressor (Fig. 2), c'the high pressure piston, d the low pressure piston, and d the low pressure turn stroke.

air compressor piston (Fig. 2), e the auxiliary slide or distribution valve, 7 the push rod which, in Figure 1, extends into the'low pressure cylinder, 9 and h passages for conducting the motive fluid through channel is to the dlstribution' chamber 0 of the main valve chest, 2' the pressure balancing or equaland the motive fluid has access to the chamber out the main valve chest, the auxiliary slide valve 6 having been moved by said fluid into the position shown in the drawings,whereupon the main valve p is moved to the. end position shown. Live steam or other motive fluid now enters behind the piston 0 through the passager, while the steam on the other side of the high pressure piston acts through the passages'sgu, upon corresponding side of the low pressure piston d or low pressure compressor piston (5, (Figs. 1 and 2), the

space in front of said piston then being open to exhausts through the passages t, Q). When the new stroke begins the piston a closes the port 9 and simultaneously uncovers the port It, so that the motive fluid at high pressure reaches the distribution or main valve chamber 0 and the main slide valve retains its position until the low pressure piston d, or low pressure compressor piston al comes in contact with the extension f at the other end of its stroke and shifts the auxiliary slide valve e so that the passages k and m are put into communication, the opened balance passagei serving to retain the auxiliary valve in this position. The distribution chamber 0 is thereupon relieved of pressure and the main valve 7 is moved into its other end position. This change of position permits live motive fluid to enter the valve chest at z and from thence through the passage 8 into the upper end of the cylinder at to effect the re- At the end of the return stroke, owing to the difierence of pressure on the two sides of the piston 0 after it has passed the port 9, the auxiliary slide valve e is reversed by live motive fluid entering the valve chest through said port. This completes the cycle which is repeated so long as the engine is in operation.

It will be understood that I do not limit myself to the exact constructions or arrange nents of the parts forming the improved iilistribution gear, but that these may be altered Within the ambit of the claims Without sacrificing any of the advantages of the invention.

\Vhat I claim as my invention and desire to secure by Letters Patent is:

1. In a fluid-controlled system for doubleacting reciprocating piston compound engines, the combination of a source of motive fluid, high and low pressure cylinders, a high pressure piston in the high pressure cylinder, a lOW pressure piston in the other cylinder, an auxiliary slide valve having an extension projeeting into said low pressure cylinder, said auxiliary slide valve being moved in one direction only by contact of said low pressure piston with said extension and in the other direction by motive fluid from said source, and a main valve controlled by the said auxiliary slide valve and distributing the fluid to the cylinders.

2. In a fluid-controlled system for doubleacting, reciprocating piston compound engines. the combination of a source of motive fluid high and low pressure cylinders, a high pressure piston in the high pressure cylinder, a. 10W pressure piston in the other cylinder, an auxiliary slide valve having an extension projecting into said low pressure cylinder, said auxiliary slide valve being moved in one direction only by contact of said low pressure piston with said extension and in the other direction by motive fluid from said source, there being a passage between said high pressure cy inder and one side of, said auxiliary slide valve, which passage is controlled by said valve, and a main valve controlled by the said auxiliary slide valve and distributing the fiuid to the cylinders.

3. In a fluid-controlled system for doubleacting reciprocating piston compound engines, the combination of a source of niotivfi fluid. high and low pressure cylinders, a high pressure piston in the high pressure cylinder, a low pressure piston in the other cylinder, a main distribution chamber, an auxiliary slide valve having; an extension projecting into said low pressure cylinder, said auxiliary slide valve being moved in one direction only by contact of said low pressure piston with said extension and in the other direction by motive fluid from said source, there being a passage between said high pressure cylinder and one side of said auxiliary slide valve. which passage is controlled by said valve, and there being other passages establishing communication between said high pressure cylinder and the other side of said auxiliary slide valve, one of which passages serves to maintain the pressure in said main distribution chan'ibcr during the time that the other of said passages is closed by said high pressure piston, and a main valve controlled by the said auxiliary slide valve and distributing the fluid to the cylinders.

In testimony whereof I alfix my signature.

IVALTER NIELEBOCK.

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