US1651773A - Automatic air-pressure equalizer - Google Patents

Description

Dec. 6, 1927.

C. D. JARVIS AUTOMATIC AIR PRESSURE EQUALIZER Filed June 24 1926 INVENTOR C.D.Jarvis BY .LBAAIL ATTO R N EY Patented Dec. 6 1927.

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TDMAEI'IG AiIR-P EFSSURE a licat on :file-d June 24, 1926. Serial no, 118,202.

This invention relates; to improvements ,in air pressure equalizing devices l-orthe compressed air supply of Diesel engines,' my principal object bejingto provide :an automatically operating means. for preventing the airpressurein the compressor tank rising above a predetermined-pressure.

Engines of this character utilizecompressed air for various purposes, such as starting fuel feeding and scavenging, as well as ,iEor operating the whistle if the-installat-ion is on a boat, and are provided with air compressors operated by the engines themselves.

"The pressure in .thetank is therefore being continuously built up as long as the engine is in operation, and very frequently such pressure is not used up as fast as it accumulates. Some means must therefore I with an intake valve automatically opening with the suction stroke of the compressor piston and automatically closing during the pressure stroke of the piston, and my attachmentprovidos means operated by the air pressure itself tor holding this va-lve constantly open when the air pressure inthe tank exceeds a predetermined amount. This of course neutralizes the con'rpressive -action ot'the piston and no air will-be deliver-fed to the tank until the valve is again allowed to function in'the normal manner.

A further object of my invention is to provide a device for the purpose which may be readily installed in connection with an air compressor having the above type of valve without necessitating any change or alteration in such valve or compressor being made.

. A further object of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effective tor the purpose for which it is designed.

These objects I accomplish by means of such structure and relative arrangement {of parts as will fully :2 1;ppear.yby a perusal'o'f the d oll'o i-ng specification and claims...

In drawings similar characters .of rei'+ erence indicate corresponding partsin the several views:

Fig 1 is a sectional elevation iolfi myrimproved valve controlling attachment hown as "installed-in connection with a compressor head- 7 -.-Fig. 7 2 is a diagrammatic view showing the compressor, Lair tank, and valve controlifeatune's as connected up. Referring now anoregpartic-ularly to the characters vof reference on the vdatwings the numeral 1 denotes the air compressoryofthe engine having a reciprocating piston 2 therein which is operatedby a connecting rod 8 driven continually with :-:th-e operation oi the enginein the usual manner. In the head 4 oi the compressor is a downwardly opening intake valve .5 of the poppet type having a stem 6 projectingupwardly through the head. Ehe valve is normally held seated by aspring 7. i A pressure pipe 8 leads from .the compressor 1 to areservoir or tank 9 jso that with the;.'operat-ion of the engine and compressor air will be constantly,

delivered underpressure to the tank. The valve 5 is opened during the suction stroke of the'pi-ston {and automatically closed :on the-pressure stroke of the piston, but i'fthe va'l-veis constantly held. open it willbe :evident-that suchpressure stroke will not cause any air to be delivered to the pipe .8 and the tank. a 1 w 1 -My air pressure equalizing device -ior. ;au tomatically holding the valve openiwhen-the pressure in the tank exceeds a predetermined-amount com-prises a barrel 10 dis posed. in vertical alinernent, with the stem tlQThe harrelis held rigidly in positiontby a bracket member 11 clamped thereto and secured to the compressor head 4. A stem 12 alined with the valve stem 6 is slidable through a combined adjusting nut and bearing member 13'mounted in the bottom of the barrel. The end of the sleeve 12 adjacent the valve stem has a head in the form of an adjustable nut l l so that the normal distance of said nut from the stem 6 may be regulated to suit. I

The upper end of the stem 12 inside the barrel has a fixed head 15, a compression spring 16 being disposed about said stem between the nut 18 and head 15 and tending to force said stem upwardly.

Removably screwed into the top of the barrel is a cylinder 17 into the upper end of which is secured one end of an air pipe 18 leading thence to the tank 9. A union 19 i is interposed in this pipe intermediate its 12 and the piston 21 upwardly, and such movement is of course limited by the engagement of the member 22 with the rings 24, which also causes the rings to be squeezed against the pistonnto aid in maintaining an air-tight seal.

After the structure is assembled in position the head 14 isadjusted so that it clears thev valve stem sufliciently to allow proper seating of the valve. The pressure of the spring 16 is also adjusted by turning the um;

' valve to seat.

13 so that the spring pressure holding the stem 12 away from the valve stem will be equal with the pressure desired to be maintained in the tank 9 before the compressor valve becomes held open. Even though the air pressure is constantly in the pipe 18 and bears against the top of the piston, no downward movement of said piston will therefore be had until the air pressure overcomes that of the spring. The valve will then be opened and held open until the air pressure in the tank is reduced, with the using of the air, toa point where suchair-pressure is less than that of the spring. The latter then actsto raise the stem 12 and the piston, so

as to withdraw the stem 12 from engagement with the valve stem and permitting the The compressor will then function to again deliver air to the tank.

By providing a union in the pipe 18 and mounting the cylinder detachably on the barrel, said cylinder and piston therein may be easily removed as a unit without disturbing the barrel and other parts, so as to enable the packing structure to be adjusted or replaced when necessary.

From the foregoing description it will bereadily seen that I have produced such a de Vice as substantially fulfills the objects of the invention as set forth herein. 7

WVhile this specification sets forth in detail the present and pref-erred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit ofthe invention, as defined by the appended claims.

Having thus described my invention what 1 claim as new and useful and desire to secure by Letters Patent is:

1. An automatic air-pressure equalizer including a stem adapted to engage and open the intake valve of an air-compressor, a plunger separate from and alined with the stem to engage one end of the same, an en largement on the plunger, a cylinder in which said plunger is slidable, packing rings about the plunger ust beyond the end of the enlargement opposite to the stem, and a spring acting on the stem to force the same into engagement with the plunger, whereby the enlargement will then tend to compress the rings and force the same into constant air-tight engagement with the plunger.

2. An automatic airpressureequalizerin cluding a stem adapted to engage and open the intake valve of an air compressor, a plunger separate from. and alined with the stem to engage one end of the same, a barrel in which the stem is slidable and a cylinder in which the plunger is mounted detachably on the barrel.

3. Anautomatic air pressure equalizer comprising a stem arranged to engage and,

open a valve; means normally holding the stem from such engagement, a barrel in which the stem and said means are mounted, the barrel beyond the outer end of the stem being arranged for connection to a fluidpressure pipe, and means for-supporting the barrel to maintain the stem therein in definite alinement with the valve.

In testimony whereof I afiix my signature.

CHARLES '1). JARVIS.

CERTIFICATE 0i GURREC'EEQN.

Patent Ne. 1,651,773. Gianted December 6, 1927, m

CHARLES D, JARVES.

it is hereby certified that error appears in em printed speeiiieaiien oi the abeve numbered patent requiring eerreeeien as 'feiiewe: Page 2, line 93, claim 2, beiere the word "on" insert the Word "minim-ed"; and that the said Letters Patent shouid be read with this eerreeiien eiierein deaf: the same may conform to the reeerd of the case in the Patent @fiiee.

Signed and seaied this 17th day of January, A D. P928.

M. i. Meere,

Seei. Acting Commissiener of Patents.

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