US2330540A - Volumetric compressor - Google Patents

Description

, Sept. 28, 1943.

L. AUQUBERT 'VOLUMETRIC COMPRS S OR Filed "April 1, 1939 Inyenvr. Ludovic distinct spaces, one of Patented Sept. 28, 1943 ,y voriuivmrmo coMraasSoR l f Application April 1, 1939, 'sei-inist. 265,573'v InLuxemburg April 16,1938

)3 claims; (c1. 23a-2in A 'lherpresent inventiontrelatcs. tovolumetric compressors and .it is more especially, although not-,.exc1usiv.e1 y, Concerned. -withl :devices of .this vhind for usein connection:withaircrafts.

l'The object O. theY presentr invention is to provide a 1device of this kindgwhieh is better adapted to 4niieet; the requirementssoi practice than lthose used for the same purposefup lto the .present time, .and .inj particular capable of, lworking better at lrliehsp,cede-` ,i-

Accordingtogan essential ieatureof the present Vinventifon;.these engi-nes are varranged in such mannerA that :their delivery is divi-ded into two different steps and feeds duid to twol differ-ent spaces,one of thephases in question corresponding to a circulation through the compressor of a fluid capable of evacuating at least a portion of the calories developed by the operation of the apparatus.

Other features of the present invention will result from the following detailed description of a specific embodiment thereof.

Preferred embodiment of the vpresent invention will be hereinafter described with reference to the accompanying drawing, given merely by way of example, and in which:

Fig. 1 is a diagrammatic `sectional view of a compressor including a piston and an imperatively controlled inlet valve made according to the present invention;

Fig. 2 shows, on an' enlarged scale the outline -or prole of the cam which controls the inlet valve of this compressor.

In the following description, it will be supposed, by way of example, that it is desired to provide a volumetric compressor, especially capa.. ble of being used in compression operations for aircraits.

This compressor is made, as a whole, in any suitable manner, for instance as illustrated by Fig. 1, that is to say it includes a piston I driven through a connecting rod 2, by the rotation of a crankshaft 3 and moving in a cylinder 4.

This compressor is arranged in such manner that its discharge is divided into two different phases corresponding to the feed of fluid to two the phases in question corresponding to a circulation, through the compressor, of a fluid capable of evacuating at least a portion of the calories given off by the operation of the apparatus.

According to the preferred embodiment of the invention, one of the outflows of fluid takes place during at least one complete compression and delivery period and the other fluid outiiow takes place. during. at, 'least.chesuch-@Orientene cd,

dierent from the preceding one. f

l' I may, according to,4 this; hrcfcrrcdfcrhhcdiment. provide the .compressor Wiihasucbicn: vali/Ic controlled in suchmanner that vit; remains Open forY X ,discharge strokes and remains closeddar.-

.me Y such, stroxesin which .case the fluidrsuchcd insuring the Suction-Strokes .preceding cachaof said X, strokes is merely-discharged. to .theorie side of the cylinder towardthespace from which it; came dur-ing theX strokesfhiquestiom y According lto the preferred, formojf `the inventiomthe- Same fluid ,will .be s Clelive n ing the two different vph `,seafof theoperation .of

thcccmprcsscrf In this.. caselli willtcsumcirt to perform the dischargetoward one of the spaces at apressure lower than the discharge to the other space, and the cooling effect will VVbe obtained.

In the following description, it will be assumed that v,the fiuid in question consists of'atmcspheric air, in whichv case,vthefiirst space is the atmosphere and the second is a compressed air reservoir.

A particularly advantageous embodiment of such an arrangement according to the invention is shown by Fig. 1.

In this embodiment, the compressor is tted.

with a positively controlled i'nlet orice, for in` stance by means of a valve 5, and with a discharge orice, with an automatic valve '6 with a return spring, leading toward a reservoir l. for the compressed air.

In order to actuate valve 5, I provide a cam 8 or the like, turning at a speed which is one half of that of crank-shaft 3, said cam being such that, for a full cycle. of operation, valve 5 remains open, then during a full cycle, following that above mentioned, it closes during the upward stroke of piston l, so as to permit delivery toward reservoir 1, this operation being then repeated as long as the compressor is in operation. v

Thus, after a discharge cycle during which the calories have been produced, there is a scavenging cycle during which at least a portion of these y calories is evacuated.

Of course, I might interpose X scavenging" ing the scavenging cycles, it is advantageous :to

to give the cam a A provide for a short closing of said valve, at the time when the piston is close to the top of its stroke, and for this purpose, for instance, I provide cam 8 with a recess 9 at the suitable space, as shown by the diagrammatical view of Fig. 2.

Then, in all cases, I obtain a compressor the internal cooling of which can be regulated at will by the circulation of the iuid dis-charged toward the rst mentioned space.

s a matter of fact, this iiuid may be used for the external cooling of the compressor, by being obtained according to the present invention permits of considerably increasing the speed of revolution of the shafts of compressors, and of Working them without damage at the high speeds that are generally employed in the case of accessories used in connection with aircraft engines.

In a general manner, while I have, in the above description, disclosed what I deem to be practical and efcient embodiments of the present invention, it should be well understood that I do not Wish to be limited thereto as there might be changes made in the arrangement, disposition, and form of the parts without departing from the principle of the present invention as comprehended within the scope of the appended claims.

What I claim is:

1. A 'compressor having a crankshaft and a piston connected to said crankshaft and including a suction orifice, a rst valve `for controlling said suction orice, a delivery orifice, a compressed air reservoir connected to said delivery orifice, an automatically operating Valve having a return spring to control the delivery oriiice, a cam for operating said rst valve, means for driving said cam at half the speed of the crankshaft of the compressor, whereby during at least a portion of the compression stroke of one complete cycle said rst valve remains open and during the following complete cycle said rst valve closes during the compression stroke of the piston, thereby permitting the deliveryof air to the compressed air reservoir. N .i 2`

2. A compressor according to claim 1, wherein the said cam permits said first valve to close for a short period during theA scavenging cycles and at the time when the piston is inthe vicinity of its upper dead point, so as to prevent the piston from striking thisvvalve. f i

3. A. compressor according to claim 1, in `which the inlet conduit is so arranged that the f discharge of the air during the compression stroke of the cycle when the first valve' remainsiopen is directed towards the head of Ithe compressor for cooling the same. i f

LUDOVIC AUDUBERT.

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