US982753A

US982753A - Multiple-effect gas-compressing apparatus.

Info

Publication number: US982753A
Application number: US53492809A
Authority: US
Inventors: Gardner Tufts Voorhees
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-12-27
Filing date: 1909-12-27
Publication date: 1911-01-24
Anticipated expiration: 1928-01-24

Description

G." T; VOOQRHBBsiy MULTIPLE EFPEGTGAS GQMPRBSSING APPARATUS.

" APPLIOATION FILED 1120.37. 1909.

- 'Patented .1311.24, 1911.

Gam; kvooRHlas; y MULTIPLE EFFECT GASQCOMPRESSVING APPARATUS.

` APPLIUATION r'ILBD 11mm, 1909.

`lafimn-fl Jan. 24, 1911.

` s SHEETS-811mm.

G. T. vooRHEBs.- `MUL'IIPLL EFFECT `GAS GOMPRESSING APPARATUS.

PPLIOATvIoN FILED 1120.21, 1909.

3. T E E H J S T E E H S 3 INNTOR UNITED STA'IFMPATENT OFFICE.

GARDNER TUFTS VOORHEES, F BOSTON, MASSACHUSETTS.

MULTIPLE-EFFECT GAS-COMPRESSING APPARATUS To all 'whom 'it may concern: 1

Be it known that I, GARDNER TUrTs Voori-Inns, a citizen of the United Eratates of America, and a resident of Boston, in the county of Suffolk and State of Massachusetts, have invented a Multiple-Effect Gas- Compressing Apparatus, of which the following is a specification.

My invention relates to multiple effect gas compressing apparatus, particularly to com'- pressors of refrigerating systems, particularly of volatile liquid refrigerating s stems. Its obj ccts are, to make simple-r multip e eiectV compressors and to more simply make ordinary compressors multiple effect and by the insertion of a device in the suction pipe of an ordinary compressor to make it mul-.V

tiple-elect without changing its cylinder piston or valves and to enable such a slngle device to make 'two or more ordinary compressorsfmultiple eii'ect.

by enabling 2 the compressor to take into its` cylinder seriatt'm., through a single opening therein, gas at two or more different suction` pressures, in the increasing order of said pressures.

InV the drawings which are on three sheets :--Figure 1 is a diagrammatic part sectional elevation of a refrigerating system with my invention applied to either one or two single acting compressors. Fig. 2, is a diagrammatic part sectional elevation oftwo double acting compressors having lmyinv'ention applied thereto. Fig. 3, is a diagrammatic part sectional elevation of a two stage multiple effect suction device,

with certain modifications. Fig. 4 is a diagrammatic part sectional eleva-tion of a four stage multiple effect suction device. Figs. 5 and 6 are' elevations, partly in section, of a modified form of -two stage device having a Corliss type of valve, Fig. 5 being sectioned on line of Fig. (i and Fig. (i being sectioned on line (i of Fig. 5. Figs. 7 and Sare parts of indicator cards (toes) taken from thc cylinder cfa compressor. Fig. 9 is a. diagrannnatic part sectional elevation of a part of a. compressor showing the essential parts of a two stage device as an integral part of the comprcssors cylinder Specication of Letters Patent.

Application filed December 27, 1909. Serial No. 534,928.

pipe 1 5, 6 of re rigerators, C1, C2.

fand past valve d, into Patented Jan. 24., 1911.

head. Fig. 10 is a diagrammatic part secis sectioned on line 10--10 of Fig. 11. Fig.

11 is a diagrammatic part sectional plan of the rotating valve, casing, connections, etc., of Fig. 10, sectioned on line 12--12'of Fig. 10. Fig. 12 is av diagrammatic part sectional elevation of a single acting compressor, with another modified form of rotating valve, and wherein the ordinary suction or discharge valves of a common compressor can be replaced by the rotating valve and is sectioned on line 12-12 of Fig. 13. Fig. 13 is a diagrammatic part sectional plan of the rotating valve, casin and connections of Fig. 12 sectioned on line 13--13 of Fig. 12. Figs. 14, 15, 16, 17 are diagrammatic sectional lelevations .of rotating valve, casing and connections of Fig. 10, showing different positions of the rotating valve. Figs. 18, 19, 20 are similar diagrammatic sections of the rotating valve its casing and connections of Fig. 12. Fig. 21 is a series of indicator diagrams taken from a compressor cylinder. Fig. 22 is an enlarged portion of the toes of the cards of Fig. 21. Fig. 23 is a diagrammatic section of a special valve, to fit in casing and replace the valve of Fig. 12, to do away with the ordinary discharge valve of Fig. 12. Fig. 24 is a diagrammatlc part sectional elevation of two valve in the piston type. compressors with a two stage multiple effect suction device.

In all the figures similar parts generally have like letters or numbers sometimes with different subscri ts.

In Fig. 1,liqu1d anhydrous ammonia flows from' condenser B` (cooled by any desired means as by water trickling over its surface) through 2, 34 to ex ansion -valves eat from any desired source, romprod'ucts being cooled, e'vaporates the liquid4 'ammonia in these refrigerators; in refrigerator C1 at 15 pounds absolute pressure per square inch, and in refrigerator C2 at 2O pounds pressure. The low pressure gas from refrigeratorv C, flows through

pipe

7, 8 tolow pressure suction chamber of multiple effect suction device D, forces open valve lv, 'and flows past it into main chamber z and v through pipe 9 to suction valve chamber e, (of compressor A1) (ylinder a, and continues to fill cylinder al om the time piston b, started on its down stroke, or suction stroke, until any desired point in its stroke as at 7), (here just before the end of the down stroke). During this time the higher pressure gas from refrigerator C2 flowed through

pipe

10, 11 to high pressure suction valve chamber y of multiple effect suction device l). lVhen piston l), reaches the position shown a further downward movement of it causes a projection le, carried on its piston rod c, to engage arm j, and pull valve stemh and so open valve o, which allows the high pressure gas from chamber y to flow past valve o, into chamber a and through .pipe 9, chamber 6 past valve (Z1, into cylinder a, to join and partially compress the low pressure gas therein. Valve 'v1 being kept shut by the superior pressure on its free face. Then a littleupward movement of piston b, releases k, from arm j, and the pressure in cylinder a, rises due to compression so closing valve d and when the pressure is sufficient valve f, is forced open and the compressed gas discharged from cylinder a, past- 'val-vc f, through chamber g, and

pipe

12, 14

tocondenser B wherein itis condensedl to a liquid andagain starts on its cycle through

pipe

1, 2, etc. And on the beginning of the 4down stroke of piston b', valve f, closes and valves cl, and o, open and valve 'v2 shuts, all

because of proper differences of pressure on their faces and the cycle is repeated. An indiactor card taken from cylinder a, Would be like 1, 4, 14, 1G, 1 of Fig. 21 and its toe 3, A4 of Fig. 22; Iv lv being the vacuum line, 1,3 the admission, or suction line, of pound pressure gas, 3 the point Where valve o., opened to admit 20 pounds pressure how projection lc, can engage pivoted piece Z,

gas, 4 the'point Where valve d, closed and where compression began, 4, 14 the compression line, 14 the point Where valve f.,L opened; 14, 16 the discharge line, 16 the point where valve f, closed and 1 the 'point where valves d, 'v1 opened and where valve 'v2 closed: An ordina-ry card, Without the use of dev1ce D, taken' from compressor A', at 15 pounds suction pressure, would be 1, 2, 15, 1G, 1, the relative lengths of

lilies

14, 16 and 15, 1G indicating generally the increased weight of ammonia handled by the two stage compressor just described. It -Will be clear to those skilled in the art IWithout further description how compressor A2 can similarly be served With 15 and 2O pound pressure gas by device D, and how projection k2 onpiston rod c2 can engage arml y', to operate valve 'v2 or pivoted at m, and so engage arm y', to open valve (v2 through its stem h. In compressors A, and A2 the pistons b, b2 always move 1 n opposite directions and valve d1. or d2 1s always closed during compression 1n its cylinder by the superior pressure on the cylinder face of the valve. I In the type Ofcompressor here shown it is desirable to have' the gas passage as 16 of compressor A, cut ott' from valve chamber 6 as 1s done with a snnlar passage 17 of compressor A2, by a 2 partition 18, to avoid clearance thereby. It

is here evidentthat passage 17 can connect` with low pressure or high pressure suction gas by having valve 19 open and valve 20 shut or vice versa. It is preferable to have the high pressure suction pressure under the piston in this type of compressor forby s'o doing, although the mean effective pressure is the same, yet the down thrust during conipression and discharge on piston rod, and so on all the parts to take it up,-is less than if the low pressure gas were under the piston. In Fig. 2 compressors VA', A4 are double actingand their pistons b, 6,move in oppo, site directions. As parts similar to those of r Fig. l generally have similar lettersor fig.- ures, some with different subscripts, it will be clear to those skilled'in the art without further description how device D can serve one double acting compressor or the two double acting compressors and how, first low pressure and thenhigh pressure suction gas is admitted to' and compressed'in cylinders a3 and a, at the' same time,'on' the lupperside of-piston bzgwvlien on the under side of piston b, and vice versa. .The compressed gas be? ing discharged from cylinders a., a,4 through

pipes

6, 14 and 7, 14 or through

pipes

5, 14 and 13, 14. Pipe 8 is for low pressureand pipe 11 for high pressure gas as in Fig. 1.

chamber of device D1 through pipe 8 and to chambery through pipe 11 and both high and low pressure gas flows from chamber :a through pipe 9 to a compressors suction. valve chamber (not shown here) like e, of Fig. 1. c is a'piston rod of a compressor, (not shown) having projection k. Referring again to Fig. 1 it 1s observedthat valve vu2 opens against a'higher pressure on its under side than on its upper-side and so requires a pull onsteni h sufficient tocovercoine this unbalanced difference of pressure on the valves faces. In order to Anearly balance valve 'a2 I sometimes provide its stem It of l"ig.'3 with a piston .p ofsmaller area than that of valve o2, said piston fitting in cylinder 1. Then I connect chamber z and the under side piston p by

pipe

1, 2 and so nearly balance v2 when valve 3 is open. If desired valve e, may be actuated by piston p if the pistons area is greater than that of valve v2. To do this I shut valve 3 and open valve 4 and provide an auxiliary cylinder 1', with piston valve-p1 having rod It, and arm, 7' adapted to be engaged by projection When projection le engages arm j and moves it from the full line to the dotted line position, piston valve p, is moved from its full line to its dotted line position through ro'dlv,1 and so allows communication through

pipes

14, 13 and 7 10 of low pressure gas on the "i under side of piston p 'and (because of unl it open$` .valve u; by a pulll on `rod h.. When armi balanced pressure onpiston p) and therefore pistonvalve @have returned to their full line positions through the up 4ward movementpo 7.1 and because-of the high pressure on the lovver side of piston valve p, then both the upper fand under sides of piston p are exposed to high pressure through

pipes

5, 6 and 13, ,14' and so, when the pressure in chamber z is again less than `that in chamber y, valve 9v, is shut pressures, fourfsuch suction inlets by piston p through stem fr because of the unbalanced pressure on the two sides of valvefu2-` .f I

Fig 4: shows fhow the device D2 may have additional inlets for other higher suction being shown. `When pistoni?) of compressor A .is at a desired. position as near the fend of its suction stroke, after having taken in 15 pound pressure gas through inlet 8, chamr ber ai, past valves u, and d through chain bers z and e then arinc1 actuated from piston rod c.(connection not shown) engagesv pro- ]ection j, on stem lh1 and opens valve ruZ and so allows'20 pound pressure gas'sup i pound pressure gas in cylinder a, ther .f superior pressure projections .iria-.7.o p

" of superior pressureincylinder a and valvef is forced o; en by superior pressure andthe compresse 4join and partially compress y. the 20"- pound `pressure gas in cvlinder a, the superior pressure in chamber .e shutting valves u, and o5. `Then'arm la, is moved to position k3 and `engages projection 7'3 on stem k3 and opens valve 'v6 and soallows 30 pound pressure gas supplied to chamber ya through pipe 11b to flow to cylinder a pastvalves of, d and chambers a and c to join and partially compress the 25 f in chamber valves @,133 a5. Then piston b begins its compression stroke `and armk1 disengages and valve al closes because gasfdischarged pastv valve f through chamber that valve al opens andthe pressure in chamn `ber a falls so that valve yu,

valves 'n2 v4 fvg shut and thecycle is repeated.

An indicator card taken from cylinder ais shown in Figs. 2 `dicates suction gas, point 8 ,the y I9 compression of 15 pound pressure gas by r and 22Wher`e line 1,'-8 in'- ine of `15` pound pressure openingfof valve r2, line 8,

.compressors cylinder `ber m past valve al, chamber z connection pressure in chamber' a shut` .Then arm lo, is moved to pro]ection 'y2 on y .a shutting g and pipe "14 and thei uiston I) then starts a new suction stroke so"k Where i: rv isth again opens. andV the lovv.l pressure 20 pound pressure gas, point 9 the openlng of valve v4,

line

9, 10 compression of 20 pound pressure gas by 25 pound pressure gasfpoint 10 opening of valve o6,

line

10, 11 compression of 25 pound pressure gas by 30 pound pressure gas, point 11 the beginning of compression of gas by piston b which continues as shown by

line

11, 12;`

point 12 opening the valve f;

line

12, 16 dis- "charge of gas from cylinder a `past valve f,

point 1G the point of closure of valve f and the ybeginning of the suction stroke and' point 1 the opening of valves u, l and closing of valves o2, vv4 es.

In Figs. 5 and r6k device DEl hasa Corliss type of valve c2, here 8 is the low pressure inlet` leading to valve chamber m having valve u, provided With cage 1, spring 2, stem 3, disk 4, pin 7. Corliss valve o2 is in cham ber y having high pressure suction inlet 11 'and is actuated by stem and link mechanisin h1, k2, actuated from an eccentric or some moving part of a compressor not shown.

In operation chamber e is connected through connection 9. to a suction valve chamber (as 'e1 of A1 of'V Fig. 1 of a compressor not Low pressure gas iovvs to the shown).

through inlet 8 cham- 9,'up to any desired point of a pistons position in the cylinder of the compressor, then preferably, either near the end of the suction stroke of said piston, at the end of its suction stroke `or at the start of its com pression stroke, the` linkl mechanism h, h2 actuates stem h and valve o2 and opens communication of chambers y and a through port 10, link mechanism kph/2 `and valve 'v2 being moved from full line to dottedlinc positions. Now high pressure gas from connection 11 Hows through chamber y past' valve' r2 throughy port 10 and chamber .a and connectioii'9 to join the low pressure 'gas in the compressors cylinder and partially., compress it. Then link mechanism It; h2 is again moved toits full line .position thereby cutting oi communication of `chambers y and e and the gas in the compressors cylinder is compressed and discharged by the compressors piston. If desired the Corliss valve o2 can have a trip motion like `that ofa steam valve of a Corliss engine to shut` it quickly. Ifvvvalve r2 opened near the end yof suction stroke and closed near the beginningy of a compression stroke the toe 4of an indicator card taken from the comcylinder `vvould be-like Fig. 7 e vacuumline; 3, l1 pai-tot` admission line, 4 the point of opening of the valve r2; 4, 5, 6, 7 the compression` line of the low by the high pressure -gas and 7 the point of closure of valve'a;2 and7, 8 part of thecompression line. Itv valve c2 opened at the end of a pressors suction strokeV the toe of an indicator card isol taken from the compressors cylinder would be like Fig. 8. 3, 4 being part of the low pressure admission line, 4 the point ofopening of valve o2;- 4, 5 the compression line of the low by the high pressure gas, 5 thepoint of closure of valve 'v2 and 5, 6 part of the compression line.

If desired a compressors cylinder head as shown in Fig. 9 can contain the essential parts of a multiple eifect suction device, here shown as such a two stage arrangement. Here. low pressure gas enters chamber :a through pipe 8 and high pressure gas enters chambery through pipe 11 and gas is discharged from compressor through pipe 14, chambers e and e are so closely connected as to practically form one chamber. The operation is similar to that of device D with compressor A, of Fig. 1 as will be clear to those skilled 'in the art without further description.

Valve v2 may be of any desired `type to fulfil its requirements, as the puppet type of Figs. 1, 2, 4, 9, the Corliss type of Figs. 5, 6 or any other type, a rotating type'being s own in Figs. 10, 11, 12, 13, 14, 15, 1e, 17, 1s, 19, 20, 23. In Figs. 10, 11 the 'piston I) of compressor A is reciprocated by a connection c pivoted to piston b at 1 and to crank 2 at3, crank 2 is actuated by shaft 4 driven from any desired source of power and having gear 5 which drives gear 6 having shaft 7 and gear 20 which drives gear 21 having shaft z. connected to rotating valve ox. Valve cx is cylindrical or slightly tapering and so slightly conical and Hts in casing 23 having connections; 9 leading therefrom to valve chamber e; 11 for 20. pound pressure gas; 11,L for 25` pound pressure gas; 11b for 30 pound pressure gas. Valve vvx has

slots

24 and 25 to cause connections .scrz'atz'm between connection 9 and

connections

11, 11a and 11b. Different positions of. valve @x in its casing are shown in Figs. 14, 15, 16, 17.

In operation 15 pound pressure gas enters chamber m through pipe 8v and Hows past valves-'U1 d through chamber e to cylinder a, during, the time valve 'f1/x has revolved with no'communication between connection 9,

slots

24, 25 and

connections

11, 11,1, 111J and unt-il piston as shown in in Fig. 10), has nearly reached the end of its suction stroke. Then as shown in Fig. 17 vslot 24 allows communication between

connections

11 and 9 and so 2O pound pressure gas lowsto' chamber c and by its superior pressure closes valve o, and Hows past valve CZ to join and partially compress the 15 pound pressure gas in cylinder a and then valve yvx revolves so slot 24 closes this communication and then opens communication between connections 9 and 11a asshown in Figs. 14 and 15 and allows 25 pound pressure gas to join and sion stroke'of piston b and allowsino communication of connection 9 through the

slots

24 and 25 `with the other connections until near the end of the next suction stroke of piston b. The compressed gas being discharged from cylinder a past valve through chamber g and pipe 1.4. If desired valve (vx can serve another compressors' .stroke of same compressorif double acting,

or of another compressor, during its revolution, by a duplicate set of

connections

9a, 11C, 11d, 11.., as shown dottod in F-ig. 10. An indicator card from cylinder a as shown in Figs. 21 y22, is 1, 8, 9, 10, 11, 12, 16, 1.

Puppet suction valve Z or puppet discharge valve f of Fig. 10 may either or both be dispensed with by a modified form of valve, one type of which is shown in Figs. 12, 13, 18, 19, 20 and another form of this type for`dispensing with the discharge valve f is shown invFig. 23. When the discharge valve f is dispensed with its port is shown closed by dotted lin'e g1 of Fig. 10. When the discharge valve f is used and thel suction valve IZ of Fig. 10 is dispensed with as in Fig. 12, the compressor A has piston b reciprocated by connection c pivoted to piston I) at 1. and to crank 2 at 3, crank 2 is actuated by the shaft 4 driven. from any desired source of power and has gear 5 which drives gear 6 having shaft 7 and gear 2O which drives gear 21 having shaft la connected to rota-ting valve oy, valve 'uy is cylindrical or slightly tapering and vso slightly conical and Hts in a casing 23 having connections; 9 leading therefrom Ito cylinder a', 8 for 15 pound pressure gas, 11 for 20 pound pressure gas, 11a for 25 pound pressure gas. Valve oy has

slots

24, 25, 26 tojcause communication serz'at'm, between connection 9 and

connections

8, 11, 11a. `Different positions of valve, cy in its casing are shown in Figs.` 18 19, 20. In operation 15 pound pressure gas Hows from connection 8 through slot 26 and connection 9 to cylinder a, during thetime valve @y has revolved with connection 8 communicating with connection'9 through slot 26, the start of suchl communication be'ing, shown in F ig. 18, and until piston 5 (as shown in Fig. 12) has nearly reached the endv of its suction stroke. Then asshown in Fig. 19'slot 26 revolves to out o'f this communication and slot 24 opens communication between connections 11 and partially compress the 2Q pound pressure gas 9 so that 20 pound pressure gas joins and 130 partially compresses the poundpressure gas in cylinder o and then valve cy revolves so slot 24 cuts od lthis communication and slot 25 revolves vinto place to permit com niunication between

connections

9 and 11, vas shown in valve section of Fig. 12` and .25v

poundpressure gas joins the 20 pound pres`` suie gas in' cylinder a, and' partially coinpresses it and then valve lvy revolves to cut ott this communication assliown in 20 and further revolves during the' compressors stroke with no1 slots opening to allow com` sor if it be double acting. orof another coinpressor, diiriiig its revolution, by a duplicate set of

connections

8a, 9a, 11b, 11C yshown dotted. If desired valve f of Fig. 12 is dispensed with,ithen Fig23 valveezla modi` ficat-ion of valve ,/vy in that the position of l slot 24 is ehangedand its width is greater, is

used. Valve c, {itsin and revolvesinthe Vsame casing with the same connections, some of which are used for different purposes, as shown in Figs. 12, 13. The operation is as follows: see Fig. 23 with Figs. 12 and 13. 15 pound pressure gas flows from connection 8 through slotz26 and connection `9 to cylinder i from beginninguntil near the' endy of suction stroke of piston b when this ci'iiiiinunication closes as valve c, revolves and slot. 25 then allowscomniunication between

connections

11, and 9; 20 pound pressure gas now flowingy from connection 11a to join and partially compress the 15 pound pressure gas in cylinder a, a further .revolving of valve vz cuts oil this communication and allows no communication for part of the compression stroke of pistoiib when slot L2l revolves into position topermit comuninication ct "

connections

9 and 11 and the compressed ,lgas is` discharged `from cylinder a. through connection 9, slot 24 and connection 11 until the end ofthe compression stroke `when valve 'vz so revolves that slot 24 closes this communication and on the l'xgiiining of thenext suction stroke slotl 2G again opens communication between connections S alii-l 9. 'An indicator card from cyl! inder (L would be like 1, 3, 4, 14, 16, 1 ofliigs. 21, 22.` NIf desired valve foy, can serve another coniprcssoi"s stroke of same.conipres-` sor if it be double acting, or 'of another conipiessor, during its revolution, by aiduplcate set of connections r

SM

9a, 11b, 11C` shown dotted.

In Fig. 2&1; A, AL are two valve iii pis- `ton `type single acting compressors having valves (l, ,and clgfin their pistons I), and b2.

If my device D, is applied'to one of these compressors as to A, its operation is similar to that described Iin Fig. 1. With valve al., omitted and compressor A2 not in use, low pressure gasy enterschamber through pipe S'passes valve o, chamber e and pipe 9 to the under sident 'piston b1` in cylinder a1 and continues to so fill cylinder a, during the movement of piston b1 from its full line j to its dotted line position, or during its coinpression stroke, for discharging gas from the upper side of. its piston past valve f1, through

chamber g1 andpipe

12, 14. Then piston b1 `moves fromits dotted` to its full -line`positionfand the low pressure gas in cylinder a, is transferred past valved1 from the under` to the upper side of piston b1. Andwwhen piston b1 reaches the full 'line position shown, a projection k1 on its piston rod c1 engages 'arm j, and through stem it opens valveol and allows higher pressure gas to How from pipe 11 through chambers g/ and .e and pipe 9 into cylinder a, and past valve dlto the upper side o'f-piston blyto join andfpartially compress` the low pressure gas in cylinder a, then the up or compression stroke, of piston bl is repeated and so `the above cycle is repeated. It is evident that in the above described cycle, the space below piston b, is the equivalent of chamber e1 of Fig. 1. It the device D6 is toserve both compressors A, and A2 operated from a common source of power so that their pistons always move in opposite directions, by a single opening of valve-o2, the operation is as follows: valve d4 and projection 7a2 being omitted. `The operation of compressor A1 is as was just described, but when higher lpressure'gas is admittedto its lcylinder a,

ythrough valves v2 d, to the upper side of piston b, in its full line position, to join and partially compress the low pressure gas in cylinder al, higher pressure gas is at the saine time admitted to cylinder a, through valves 'v2 da and pipe 9a to the under side of piston b2 in its full line position to join and compress the low pressure gas in cylinder c2, piston l), having just discharged compressed gas through `valve f2, chamber q2 and

pipe

13, 14.' Then on the down stroke of piston b2 from its full to dotted line position` the higher pressure gas in cylinder cl2 is transferred through valve d2 rom'the under to the upper side of piston b2 and on the return or upstioke from the dotted to the full line position of `piston b2 the gas above the lpiston is again compressed and discliai'gediaud low'pressure gas is taken in below piston b2v through valves o, da and conduit 9 untilthe full line position 'ofpiston 712 is again reached and until hi her pressure gas is again admitted to cylin er wz'fas just described. Here it is evident that valve d, prevents flow ot' high pressure gas from cylini der azto cylinder eiland that as high pressure roo gas is admitted to cylinder a, on the underside of piston b2 to compress the low pressure gas, valve d, is here the equivalent of valve d, of Fig.y l. If it is desired to have higherpressure gas from valve v1- admitted first to cylinder a, and then a2 seriatz'm to the under sides of pistons b1 b2 then valve d, and projection 7c, 'are added, 71:2' adapted to engage arm j, of stein h, and higher pressure gas is admitted seratm to a cylinder full of low pressure gas each time piston Z2, is in its dotted osition and each time piston b2 is in its fuil line position. evident that' valves d1 and d2 of Fig. 24 now serve only as check valves during compression strokes 4and las transfer valves during suction strokes, and valves d, d, are the equivalentsof.valves d, d1 of Fiv 1. It will also beevident to those'v skille in the art Without further description how additional higher pressure suctionvalves as shown andl described in Fig. 4 and as other- Wise shown and described can be added to devicelD Claims;

1. In a gas compressor,1 the combination of a cylinder, a piston fitting in said cylin.- d'er, means to reciprocate said piston in said cylinder,` a port opening into said cylinder, a loiv pressure suction conduit leading to said port-from a source oflow pressure gas,

of Fig. 24.

-a higher pressure suction conduit leading to said port from a sourcev of higher pressure gas, said higher pressure source being eX- ternal to said compressor, a .discharge conduit leading from a port opening into said cylinder to a high pressure gas receiver, valves adapted for 'serz'fitfim governing communication of said conduits, one at a time, with said cylinder in'the increasing order of their pressures and for preventing communication of said conduits with each other.

2. In a gas compressor, the combination of a cylinder, a piston fitting in said cylinder, means to reciprocate'said piston in said cylinder, a port. opening into said cylinder, a loiv pressure suction conduit leading to said port from a sourceof 10W pressure gas, a plurality of higher pressure suction conduits leading to said port from a plurality of sources of higher pressure gas of different pressures, said higher pressure sources being external to said compressor, a discharge conduit leading from a port opening into said cylinder to a high pressure gas receiver, valves adapted for scrz'atzm governing communication of said conduits, one at a time, with said cylinder in the increasing order ofvthei'r pressures and for preventing communication of .said conduits with each other.

In a gas compressor, the combination of a cylinder, a piston fitting in said cylinder, means to reciprocate said piston in vsaid cylinder, a port opening into saidvcylinder, a

Here it is' with saidcylinder in the increasing order of. their pressures and for preventing communication-of said conduits with each other. Q

4. In a as compressor, the combination of a cylin er, a piston fitting in said cylinder, means to reciprocate said piston in said cylinder, a port opening into said cylinder, a low pressure suction conduit leading to said -port from a loiv pressure refrigerator,- a `plurality of higher pressure siiction conduits leading to said port from a plurality of higher pressure refrigerators of diterent pressures, a discharge conduit leading from a port o ening into said cylinder to a condenser, vai)ves adapted for sem'ztifm governingv communication of sai-d conduits, one at a time, with said cylinder in the increasing order of their pressures and for preventing communicationof said conduits with each other... p

5.- In a gas compressor, the combination of a cylinder, a piston fitting in 'said cylinder, means to reciprocate said lpiston in said cylinder, a, suction port' opening into said cylinder,` a'low pressure suction' conduit leading to said portjfrom Va source of low pressure gas, a higher pressure suction conlduit leading to vsaid port from -a source ofy higher pressure gas, said higher pressure source being external to said compressor, a discharge port opening into said cylinder, a discharge lconduit leading from said discharge port to a yhigh pressure gas receiver, lvalves adapted for sena-tim governing conimunication of said conduits, one at a time, with said cylinder in the increasing order of their pressures and for preventing communication of said'conduit's with each other.

6. In a gas compressor, the combination of a cylinder, a piston vfitting in said cylinder, means to reciprocate said piston in lSaid cylinder, a suction port opening into said 4cylinsaid port rom a source of low pressure gas, a plurality of higher pressure suction conduits leadingto said `port from a plurality of sources of higher pressure gas atdifferent pressures, said higher pressure sources der, a low ressure suction conduit leading to l being external to said compressor, a discharge port ofening into said cylinder, a

vdischarge con uit leading from said discharge port to a highl pressure gas receiver, valves adapted for sewatm governing vcommunication of said conduits, one at a time, with said cylinder in the increasing order of their pressures and-for preventing coni;-

munication of said conduits `with each other.

g 7; .In a gas compressor, the combination'lof a cylinder, a piston fitting in said cylinder,`

means to reciprocate said piston in said cylinder, a suction port' opening into said cylinder, a low pressure suction conduit lead-` Ving'tosaid port from alovv pressure refrigerator, a higher pressuresuction conduit n leading to saidport from a higherpressure refrigerator, a discharge'port opening into 'said cylinder, a'discharge conduit `leading from. said dischargeport `to a condenser,

valves adapted for serz'ati'm governing coinmunication of said conduits, gne at atime,y -With said 'cylinder in theincreasing order of their pressures and for preventing coin munication of said conduits with each other. 8. ln a gas compressor,the combination of t, a` cylinder, a piston fitting in said cylinder,`

means to reciprocate said piston in said cylinder,a suction-port opening into said cylinder, a low pressure suction conduit leadv` ing tosaid ortfrom alow pressure ,refrigerator, a p urality of `higher pressure suc-` tion conduits leading to saidpo'rt from a` plurality of higherv pressure refrigeratorsjat different pressures, a discharge `port' open-vv ing into said cylinder, a dischargeconduit leading from ysaid `discharge port to a con denser, 'valves adapted for serz'azim govern ing communication of said 'coiiduits',one at a-tiine,pivith said cylinder inthe increasing order of theirpressures'andfor preventing has,

` port opening from saidxllow pressure suction valvechanicommunication of said conduits with each` other.` Y

S). In a gas compresser, the combination of a cylinder, a piston fitting in said cylinder, means to reciprocate `said piston in said cylinder, adiscliarge valve chambena port opening into `said cylinder from said discharge valve chamber, a puppet discharge valve adapted to overn saidport, aconduit leading from sai Adischarge valve chambery to a high pressure gas receiver, a main valve chamber, a.k portopening `into said cylinder from `'said main valve: chamber, 'a puppet suction valve adaptedto govern said port, a loiv` pressu esiiction Vvalve chamber. a

into said main valve chamber ber, a `puppet suctionevalve adapted to govern said port, a conduit ieadingfroni a source of low pressure gas to said low pres-pN sure suction valvev chamber, a higher pressure suction valve chamber,a `port opening into said main 'valve chamber `from `said higher pressure suction valve chamber, ,a suction valve adapted to' be actuated from said pistons reciprocating means to govern' said'port, fa conduit leading from a source of higher pressure gas tosaid higher pres-y sure valve chaniber,said sourcebeing ex`- `,ternal to the gas compressor. ,i

10; AIn a gas compressor, the combination ofa cylinder,` a piston fitting in said cylinf. der, means to yreciprocate said piston in said cylinder, a, discharge valve chambeiga port opening intr said cylinder from said -discharge lvalve chamber, a puppet dischargevalve adapted to govern said port, a conduit leading from said discharge valve chamber to a high pressure gas receiver, a lmain valve chamber, a port opening into said cylinder from said main valve chamber,

ai puppet suction valve adapted to govern said port, a low pressure suction valve chamber, a portopening into said .main valvechamber from said lowpressure suc- ,tion valve chamber, a puppet suctionvalve adapted togovern said port, a conduit leadying lfrom a! sourceI of low pressure. gas to said lovv pressure suction valve chamber, a plurality of higher pressure suction valve chambers, ports opening into the main valvechamber from each of said plurality of chambers, suction valves adaptedto be actuated from said pistons reciprocating means to govern each of said plurality of ports, puppet suction-valves 'adapted `for governing all except the highest pressure port of said pluralityof ports, conduits leading from a plurality of higher pressure sources of gas at different pressures to the plurality of suction valve chambers, such sources being external to the gas compresser. v

11, 'In a gas compressor, the combination der, means to reciprocate said piston in said cylinder, a discharge valve chamber, a port opening into said cylinder fromsaid discharge valve chamber, a puppet discharge valve adaptedto govern, said port, a, conduit leading `from sa-id discharge valve chamber toa condenser, a'main valve chamber, a port opening into said cylinderairom said mainv valve chamber, a puppet suction valve adapted to govern said port, ai low pressure suction valve chamber, a port opening into saidv main valve chamber from said low pressure suction valve chamber, a puppet chamber, alhigher suction valvel chamber, a port openinginto said main; valve chamber from saidhighersuction valve chamber, a`

suction ,valve adapted to be actuated from said-pistons reciprocating means ltogovern said port, a conduit leading from a higher pressure refrigeratorl to said higher pres'- sure suction valve chamber.,`

12. In a gas compressor, the combination -iof a cylinder, a piston fitting in said cylinder, means to reciprocate said piston insaid cylinder, a discharge valve chamber, a port lopeninginto "said cylinder from said discharge valve chamber, a puppet discharge valve adapted to govern said port, a conduit .l leading from said discharge valve -chamber to a condenser, a main valve cham- 'of a cylinder, a piston fitting in said cylin. 'i

'suction valve adapted to govern said port, f Mia-conduit leading v'from a'low pressure rev'frigerator to said lovv pressure suction valve iis valve chamber, a plurality r,of higher pressure suction valve chambers, ports opening into the main valve chamber from each of said plurality of chambers, suction valves adapted to be actuated from said pistons reciprocating means to govern each of said plurality of ports, puppet suction valves adapted for governing all eXce t the highest pressure port of said plurality of ports,

conduits leading from' a plurality of higher pressure refrigerators .at different pressures to the plurality of suctionvalve chambers.

13. A multiple'suction device for gas compressors comprising a main chamber and two other chambers, each of said other chambers having a valve governed [port opening therefrom into the main VIchamber, an opening in each chamber for connection of a conduit thereto.

14. A multiple `suction device for i as compressors comprisingA amain cham er and a plurality of other'chambers, each of said other chambers having a'valve governed port opening therefrom into the main chamber, an ,opening in each chamber for connection of a conduit thereto.

15. A multiple suction device for gascompressors comprising a main chamber and two other chambers, each of said other chambers. having a ort` opening therefrom into the main cham er,"a valve adapted to govern one of said ports, a valve adapted to be actuated from a gas compressors piston reciprocating meansto govern the other port, an opening in each'chamber for connection of a conduit thereto.

16. "A multiple suction device for gas compressors'comprising a main chamber and a plurality of other chambers, each of said other-chambers having sport opening therefrom intothe main chamber, a valve adapted to govern oneof said ports, valves adapted to bel actuatedv gfrom a gas compressors piston reciprocating means to govern the other ports, an openin in each chamber for connection ofV a con uit thereto.

17. A multiple suction device for gas compressors comprising a main chamber and two other chambers, each of said other chambers'having Va port opening therefrom into the main chamber, a puppet suction valve adapted to govern one of said ports, a valve adapted to be actuated from a gas com- 4 'pressors piston reciprocating means to gov- Apiston reciprocatin other chambers having a port opening therevfrom into the main chamber, puppet suction valves adapted to govern allbut oneof said ports, valves adapted to be actuated from a gascompressors piston reciprocating means to govern all but another one of said ports, an openingin each chamber for connection of a conduit thereto. c

19. A multiple 'suction devicefor gas compressors. comprising a main chamber and three other. chambers, each of said other chambers having a valve governed port opening therefrom into the main chamber, an opening in each chamber for connection of a conduit thereto.

20. -A multiple suction device for gascompressors comprising va main chamber and four other chambers, each of said other chambers having a valve governed port opening therefrom into the main chamber, eac'hcf said other chambers having an opening therein 4fo'r- 4connection of a conduit thereto. v v

21. A mult-iple suction device for' gas compressors comprising a main chamber and al plurality of.other chambers, each of. said other chambers having a valve governed port opening therefrom into the main chamber, an opening in each of the plurality of chambers for connection of a conduit thereto.

22. A multiple suction device for gas compressors comprising a main chamber and three other' chambers, each of said other chambers having a port opening therefrom into the main valve chamber, valves ladapted togovern two of said ports, a valve adaptedv l to be actuated from a gas compressors piston reciprocating means to govern the other port, an opening in each chamber for connection of a conduit thereto.

23. A multiple suction device for gas coinpressors comprising a main chamber and four other chambers, each of said other chambers having a port opening therefrom into the main valve chamber, valves'adapted to govern three of said ports, a valve adapted to be actuated from a gas compressors n means to govern the other port, an opening in each of said other chambers for connection of a conduit thereto.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

' GARDNER TUFTs Voorn-inns;

Witnesses: A

PHILIP F. SHANLY, J oii'N HARTLEY.