US625759A - Ligluefied-am-conveying conduit - Google Patents

Description

No. 625,759. Patented May 30, 1899 E. C. HARGRAVE.

LlflUEE-"IED AIR CONVEYING CONDUIT Application filed July 26, 1898.)

(N0 Modei.)

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srnorrroarron forming part or Letters l atent No. 625,759, dated May 30, mos.

. Application nu July 26, met.

To' all whom it may concern.-

Be it known that I, EDWARD'C. HARGRAVE, aciti zen of the United States, residing at Bay City, in the county of Bay and State of Michigen, have invented new and useful Improvements in Liquefied-Ah"-Conveying Conduits, of which the following is a specification.

This invention relates to the art of utilizing liquefied air or gas for cooling or 'refrig' rooms, or other spaces where a low temperature is desired for preserving perishable articles or-for refrigerating purposes in general. The llIVBDlJlOlLOOflSlSlJS of the process and apparatus hereinafter described, and set forth in the claims.

In the drawing, the figure represents in sec tional elevation the structural embodiment of my invention which seemsat this time to be the preferable one. I

In order to enable those skilled in the art to make and use my invention, I will now describe the same in. detail, reference being made to the accompanying'drawing, wherein the numeral 1 indicates a reservoir or tank containing liquefiedair or gas obtained, as is known, by reducing air or gas to a liquid V state through the medium of high. pressure and reduction of temperature. The reservoir or tank connects by a pipe 2 with a liquidforcing steam-pump 3 or any other pump which will serve to. force the liquefied air through the piping, hereinafter explained, if the liquid requires to be elevated. The'pipingforconveying the liquefied air from the pump to a more or'less distant point or frol'n one apartment or room of a building to another apartment or room is represented as first rising vertically, as at 4, from the pumpcylinder, and thence extending horizontally, as at 5, through the apartmentsor rooms of the building to the place or point where the liquefied air is to be utilized for refrigerating or other purposes. The piping-'4 5 maybe composed of ordinary metal tubes, and it is completely enveloped orsurrounded by a nononduoting casing 6, preferably so applied relatively to the exterior of the piping as to create or provide a surrounding space hei tween its inner side and the exterior of the I piping for a purpose which will hereinafter crating apartments, chambers, refrigerators,

Berisl No. 686,832. (No model.)

appear. The casing is preferably coinposed of felt or rock-wool; but it may be made of any other suitable non-conducting material or substance. This casing excludes the out bursting of the latter, while the uon-couduct' ing casing excludes the heated atmosphere are from the surface of the piping, reduces the temperature of the latter, and maintains the liquefied air in the piping in a liquid state, except as to the portions which naturally evaporate. The evaporated liquefied gas in the form of a vapor is preferably conducted by short tubes 10 from the safety-valves into-the space between the inner side of the non-couducting casing and the exterior of the piping or the purpose of cooling the latterand aiding in maintaining the liquefied gas flowing or passing through such piping in a liquefied state. I. do not wish to be understood, how

ever, as confining myself to conducting the evaporated liquefied gas from the safetyvalves to a. space betweeuthe non-conducting casing and the exterior of the piping; nor do I confine myself to so arranging the non-conducting casing relatively to the surface of the piping that there is a surrounding space he tween the same. The non-conducting casing may be placed in direct contact with the piping, and the evaporating liquefied air may pass away after escaping from the safety-valves or be utilized for cooling purposes.

By the construction described it will be observed that the evaporating air or gas in the pipe 4 5 is allowed to escape therefrom in suiiicie-nt quantities and is utilized to maintain.theremaiuing air or gas therein in a liquefied state, and thereby prevent undue pressure within said pipe.

The pump for forcing the liquefied air or gas through the conduit to the place or point desired may be dispensed with lifthe lique IOU mam m above aim ievni (if the com wiii be Qbvioiis.

I v m; iiius described. my izi'a-eniion, what 1i. process conducting liquefied air in: mm me poini; i9 another, which com EiP S iii piping the game, aiiswing a puiiipu .iiifli in evzipmzite, in quantities sufficient main tain the main body of the air or gas in iiqueiieii state and thereby {mavens undue iiiwi'efi'om. 2, The process of onductmg iiquened air m" 1" mm one point to another, which consiaiiis in piping; the same, allowing a, portion iimraof t0 evaporate and conveying the evagiamted portion through an annular space zii'mmfl'the main body of the air or gas in qiismiibies SliffiCiBD'fi to maintain said body in iiqiieiied state and thereby prevent undue iiiifiifiiil'fi therefrom.

A mmiuit for liquefied aii' 0r gas, provided with means fmpermit-ting the escape 05f ev'iigiin-aiing iii! 92? gas; from the integior iiiwieOfi-in Slfi"i8nir(} i1iifli|iiiy to maintain the air 0: i quid in said cenduit and thereby undue strain thereof.

o liquefied air or gas comoncomiuciing sui'idund 1;, and fer pcrxxaii-ting piping, in suificient quantity to maintain the air 01* gas liquid in. aid piping and thereby permitting iiia escape of Um evaporating air or gas from said piping in sufficiezit quantityto maintain the air or gas liquid. in said. piping and thereby pi'cveni; undue strain ilhfiififfif v 6. Tim combination with piping for couveying liquefied air 0r gas fmnione place to another, of a casing reiaitiveiygrranged to the exterriai surface of the piping tu'provide a continuous intarvening space, regulatingvaives connected with 011% piping at different points for permitting the escape of the evaporating air 01' gas from the interior of the piping to. the intervening space in 'snffieient quantity is maintz iii the air 0r gas liquid in said piping and thereby prvent; undue: strain thereof,

In testimony whereof I have hereunto-set my hand in presence of two subscribing witnesses.

EDWARD G. HARG-RAVE. Witnesses:

ALBERT H. N'onms, F. ii KEEFER.

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