US1848226A - Thermally-actuated motive device - Google Patents

Description

I Marcia 8, 1952.. c. SCOTT-SNELL ET AL 1,848,226

THERMALLY ACTUATED MOTIVE DEVICE Filed Jan. 11. 1930 {NWSN 7-1415 Patented: Mar; ,8,' 1932 J r0 INTERNATIONAL VACUUM POWER,Lnv rrEnpnLo non,- n1 eLAivn V rHEnMALLY-AcrnA'rEn moms nn vicn Applicationfiled January 11', 1930, Serial No. 420,265, and in GreatBritain January 12, 1929.

This invention relates to thermally actuated motive devices wherein heat is continuously supplied to a vaporgenerator which is in communication by way of suitable valves,

with an inlet and, an outlet duct communicating respectively with a supply of liquid and with apparatus to which it is desired to convey the said liquid, a pressureor velocity head being produced in the liquid by automatic action.

Examples of such'devices are included in ;United States'specification No. 1,7 7 3,55 1; VWe

have found that when such devices areapplied in practice in connection with the feed ingot oil under pressure to oil nozzles-there is a limit to the pressure which canbe derived from thesystem amounting to about or lb. per square inch. In some cases it i i is desirable to employ higher delivery pressures and the object of the present invention .isto provide means forthe attainment of such a pressures.

The attached diagrammatic figure illustrates one. convenient mode of carrying the present invention into eifect. According to this figure we provide avapor generator m which is closed at its lower end and bent over I area as compared with that of the U-tube m,

to form a U-tube, the other limb a of which is connected to a vertical conduit 30,theupper end 20 ofwhich is connected by way of an uptake pipe '0 of small cross-sectional n to the vapor generator m, the connection of the latter being at a point'somewhat below the upper end thereof.- The upper end 20 of the vertical pipe is also "connected by a pipe 31 with the upper end ota-further vertical pipe p, the lowerend of which isconnected by way of a'duct 21 with thepipe 30 as shown. The lower end of the pipe ;0 isturnished with 'a non-return inlet valve 32, while the upper end of thispipe p is furnishedwith a nonreturn delivery valve 33;

Thevapor generator-1s furnished with a strip 15 of heat-conducting material such as brass which is intended to restcontinuously I f in a flame or other source of heat,

In operation, so long as heat is continu- 7 Q ously supplied to the tube m by way of the strip 15 a recurring cycle isprodu'ced as folture of the liquid in the generator m. When condensation ofthe vapor rising through'the "oneness scornsnnnnnnn EDWARD sco'rr-siinnnfor neuron, nnenhnnjiissienons;

lows :Vapor is generated into the generator I a m and at the same time liquid is delivered 1 past the valve 33 and after a time interval is ejected through the tube 0; The vapor,

however, beforev it reaches the tube 19 for condensation is caused to travel by way of the upper end 20 of the tube 30;"the slight delay occasioned thereby being sulficient to ensure substantial uniformity of the temperapipes 0 and 31 does take'place none ofthe l1qu1d in the pipe 'm'is of such a high tem's perature as will enable itto-boil and thus the full effect of the pressure drop resulting from, condensation is utilized in drawing in I i fresh liquid past the valve 32.

It willbe appreciated thatbefore heat is supplied to the strip 15Ithe apparatus is com- Having now described our invention what we claim as new and deslre to secure by Letters Patent is 1. 'A thermally actuated motive device including a liquid-containing conduit, a non-'. return deliveryvalve at thetop thereof,a-

non-return admission valve at the bottom thereof, a continuously heated inverted U- shaped conduit, the open end of one limb of which is connected to said former conduit at a point adjacent its lower end and above said delaychamber and between said latter cham-e her and a point adjacent said upper end of the first-mentioned conduit and .below saidvalve.

2; A thermally actuated device as claimed i in claim 1 wherein'said'condensation delay chamber comprises a tubular space for the retention of vapor after its ejection fromi.

said inverted U-shaped conduit and prior to 5 its condensation. r p

3. IA thermally actu ted device as claimed in claim 1 wherein said condensation delay chamber is disposed in heat exchange relationship with the smaller bore conduit connected to the U-shaped conduit whereby said condensation delay chamber is maintained sufliciently hot to preclude immediate condensatiou by heat derived fromvapor ascendin through said small bore conduit. I V V n testimony whereof We have signed our names to this specification;

CHARLES SCOTT-SNELL. EDWARD SCOTT-SNELL.

Images