US1105171A - Refrigerating apparatus. - Google Patents

Description

J. ZANDBR & J. LBVEY. R'BPBIGBRATING APPARATUS.

APPLICATION FILED APB.14,1913.

' Patented July 28, 1914.

SHEETS-SHEET 1.

J. ZANDBR & J. LEVEY.

RBFRIGERATING APPARATUS.

APPLICATION FILED APR.141913.

1,105, 17 1 f Patented July 28, 1.914,

4 SHEETS-SHEET 2.

J. ZANDER & J. LBVEY.

RBFBIGERATING APPARATUS.

APPLICATION FILED APR. 14` 1913.

J. ZANDER L J. LEVEY.

REPRIGERATING APPARATUS.

APPLICATION FILED APR.141913.

Patented July 28, 1914.

4 SHEETS-SHEET 4.

Lingen /n Zan UNITED srAIEs ,PATENT OFFICE.

JOHN ZANDER AND-JOHN LEVEY, or CHICAGO, ILLINOIS; SAID LEVEY AssIGNoR To i Y SAID zANDER..

REFRIGERATING APPARATUS.

Specification of Letters Patent.

Patented July 28, 1914.`

"appneatin mea apra 14, 191s. serial No. 761,021.

To all whom it may' concern Be it known that we, JOHN ZANpER and JOHN LEVEY, citizens of the United7 States, residing at Chicago, in the county of Cook and State of lllinois, have invented a new and useful Improvement in Refrigerating Apparatus, of which the following isA a specilication. 4

Our invention relates more particularly toA improvements in anhydrous ammonia refrigerating apparatus. 'In apparatus of this type it is common to provide `a generating chamber for generating the ammoniagas, an absorbing chamber containing water and into which the ammonia-gas after passage through the refrigerating coils is dischargedA for mixture therewith, with means in said absorbing chamber for cooling the ammonia liquor therein, and a condensingchamber into which the ammonia-,gigas produced in the Generator is discharged and reduced to liquid condition preparatory to its introduction into the refrigerating coils. lt is also common practice to repeatedly use the original charge of ammonia, and as the ammonia-gas after passing through the re- .rigerating coils is discharged into the absorbing chamber, it thus becomes necessary to replenish the supply of ammonia in the generator as it is withdrawn therefrom during the operation of the apparatus, with ammonia from the absorbing chamber. This is commonly done by pumping the liquor from the absorbing chamber into the generating chamber and providing for a corresponding flow of liquor from the latter to the absorbing chamber, thus producing a circulation between these chambers which causes the liquor in both to be maintained of approximately equal strength. The pressure in the generating chamber, however, is relatively high,-usually about one hundred pounds to the square inch, as Compared with substantially atmospheric pressure in the absorbing-chamber, and in constructions as hitherto provided it is necessary to pump the liquor from the absorbing-chamber into the generatingchamber, against the relatively high pressure in the latter, thugA rendering necessary the use of comparatively high-power pumps, the installation and operation of which is attendant with relatively great expense. liurthermore in operating apparatus as hitherto provided careful attention on the part of vthe operator is required, and the conditions in general attending its'operation' are such that the cost of mstallatlon and operation render the use of` such types of apparatus, where a relatively small capacity only is needed, prohibitive. f

One of our objects, generally stated, is to provide improvements in apparatus of this type wherein the cost of installation and operation thereof will be greatly reduced and be suiliciently low, as compared with apparatus as hitherto constructed, that apparatus of relatively small capacity maybe installed and operated with economy.

Another object is to provide improvements in the heat-interchanger commonly employed for causing the liquor during its discharge from the generating chamber into the absorbing chamber, to be cooled by the counter-flow of liquor from the absorbing chamber to the generating-chamber, in order that the interchaned liquor shall more nearly approach in temperature the temperature of the liquor into which it is discharged.

Still another object is to provide an improved construction ot' dehydrater which,

shall be of Simple form, economical of manufacture, and which shall operate positively to separate the water vapor from the ammonia vapor generated in the generating chamber, for preventing water vapor from passing into the condenser; and still anotherobject is to so improve upon apparatus of the type above referred to as to cause it to be better adapted for the performance of its work in a positive manner, with economy, and with the minimum amount of attention. Referring to the accompanying drawings: Figure 1 is a view in elevation, partly diagrammatic, of an apparatus constructed in accordance with our invention. Fig. 2 is a longitudinal sectional view of the pumping means employed for eifecting the interchanging of liquid in the absorbing and generating-cha1nbers- Fig. 3 is a section taken at the line 3 on Fig. 2 and viewed in the direction of the arrow. Fig. 4 is a view p in vertical sectional elevation of the generatying chamber, the absorbmg` chamber superposed thereon, and our improved dehydrating means, the latter being shown in full elevation. Fig. 5 is a section taken at the line 5 on Fig. 4 and viewed in the directipn of the arrow. Fig. 6 is a section taken at the line 6 on Fig. 4 and viewed in the direction of the arrow, showing the thermostatic means employed for regulating the heat in the generating chamber Fig. is a view in vertical sectional'elevationofour improved vheat-interchanging device. Fig. 8 is a view in vertical sectional elevation of thc ammonia condenser employed; Fig. 9`

is a sectional view of the vvalve-means operated by the thermostat shown in Fig. 6 for controlling the iowof gas to the burner of the generating chamber; and Fig. 10, an enlarged section taken at the line 10 on Fig. 1 and viewed in the direction of the arrow.

rl`he generating-chamber, represented at 11` is shown as surrounded at its lower end, and supported, as indicated at 12, from a casing 13 which contains the means for heating the chamber 11, these means 1n the construction illustrated comprising a gasburnerl 14 supplied with gas from a suitable source thereof, not shown, through a pipe 15.

The absorbing chamber is represented at 16 and in the construction illustrated surmounts the generating chamber 11, the bottom plate 17 of the former forming the top of the chamber 11. AThe cooling coil of the absorbing chamber 16 is represented at 18 and is preferably connected with a supply of cold water, as hereinafter explained.

The ammonia-gas condensing chamber is represented at 19 and contains a cooling coil 20 through which' cold water is eirculated, as hereinafter described, the condensin chamber 19 being connected with the re rigerating coils represented at 21, throughl the medium of a pipe 22 containing an expansion-valve represented diagrammatically at 23, and which may be of any suitable construction, the discharge-end of the coil 21 being connected with a. pipe 24 which opens into the chamber 16 and preferably terminates in anl annular spray-head 25 located in the latter, the expansion-valve 23 being preferably so adjusted in practice f as to reduce the pressure in the coil 21 to a degree slightly greater than the pressure in the chamber 16.

In accordance with' the preferred illustrated embodiment of our invention, We provide a dehydrater in the absorbing chamber 16 which `operates to remove all' water vapors from the ammonia vapors generated in the chamber 13 before they pass into the condenser 19z the .following being a description of our improved construction for this purpose: Extending upwardly in the chamber 16, and located within the convolutions of the coil 18, is a series of pipes 26 which open at their lower ends through the plate 17 and into the chamber l1 and at their uper ends into a gas-tight box 27, above the cttom of the latter, the box 27 communieating with the condensing chamber 20 through the medium.` of a pipe 28 open at its opposite ends and which opens at one end into the chamber 20 and at its o posite end passes through the top of the c amber 16 and the top of the box 27 and terminates below the 'tops of the pipes 26 and preferably centrally of the series thereof. A pipe 29 opens at its upper end into the box 27, through the bottom of the latter, and at its lower end'extends through the plate 17 into the chamber 11, this pipe carrying on its 'lower end a cup 30 which communicates with the interior of the pipe 29 through openings 31 in the side of the latter and thus forms a water seal, as hereinafter described, for preventing ammonia-gas from passing from the chamber 11 through the pipe 29.

In the operation of the apparatus, the ammonia-gas generated in the chamber 11 passes therefrom through the tubes 26 into the box 27, thence into the pipe 28 and into the condensin chamber 19 where it is reduced to liqui form, any water vapor gen'- erated in the chamber 11 being condensed either on the platev 17, which is relatively cool, or 'ln the tubes26, or in the box 27, in the latter case the condensed water vapors flowing from the box 27 and thence into the cup 30, through the pipe 29, from which cup they overflow into the chamber 11. The liquid ammonia in the condenser 19 in passing through the expansion valve 23 expands into gaseous condition, thence passing through the coil 21, Where it performs the refrigerating function in accordance with common practice, and then by way of the pipe 24 enters the absorbing chamber 16 where it is mixed with the ammonia liquor therein and the heat thus developed removed by the cooling effect of the Water in ythe coil 18.

As the ammonia-gas is generated for supplying the coil 21, from the ammonia liquor in the chamber 11, and as the discharge from the coil Y21 is into the absorbing chamber 16, it is necessary that the liquid in these chambers be interchanged, and this is accomplished in the construction illustrated by my improved circulating means, a description of which is as follows: As a preface to the following description it may be said that it is well understood in the art that the pressure inthe chamber l1 under normal operating conditions isabout one hundred pounds to the square inch, as compared with substaiitially atmospheric pressure in the chamber 16, and thus the interchange of liquid just referred to involves the passage of liquid into a chamber wherein the liquid is under relatively high pressure, from a chamber wherein the liquid is under substantially no pressure.

The pumping means for producing circulation of the4 liquid is represented in Fig. 2, and in the preferred form illustrated comprises: a pair of alining cylinders 31 and 32 containing pistons 33 and 34, respectively,

` connected together by a'rod 35,'r the cylinder 32, and piston 34 constituting the pumpproper and the cylinder 31 and piston 33 the driving means therefor. The ump-casing contains a supplemental cylin er 36 containin a piston-valve 37 having openings 38 exten g` longitudinally therethrough, the interior of the cylinder 36 bein connected at one end with the' correspon mg Iend of the cylinder` 32 by a passagef39 and having ports 40 and 41 opening into'it, as illustrated 1n Fig. 2, the ports. 40 and 41 and passa `e 39 being'\so disposed as to cause the port 0 and passage y39 to be in communication with each otherl\throu h the openings 38 in the piston-valvelrr en the latter is in one po-4 sition, and open the port 41 to the passage 39 and close to the latter the port 40, when the piston-valve 37 is shifted to another position, as hereinafter described. The valvemeans for controlling the fiow of fluid-pressure into the cylinder 31 to operate the piston 33 areof well-known construction, and comprise a casing 42 with inlet and outlet ports 43 and 44 respectively, the former opening into the cylinder 31 at the opposite ends of the latter, a slide-valve 45 for controlling the ports 43 and 44, connected with a rod 46 carr ing pistons 47 and 48 operating in cylin ers 49 and 50, respectively, which communicate behind the pistons therein, with the fluid pressure supplied through relatively small apertures 51 1n the pistons 47 and 48, these cylinders opening into the respective ends of the cylinder 31 through the medium of as sages 52 and 53, respectivel equippedp with outwardly opening chec (-valves 54 extending into the path of movement of the piston 33. The pistonvalve 37 is reciprocated in the cylinder 36 for the purpose hereinafter stated, at the end of each strike of the piston 34, and in the construction illustrated is thus operated from the valve mechanism vjust described, through the medium of a rod 55 which is connected with the pistons 37 and 47.

IThe end of the cylinder 32 opposite to that equipped with the passage 39 contains a port 56 which opens into a chamber 57 com` municating at its upper and lower ends with pipes 58 and 59 respectively, and containing.,

ball-valves 60 and 61, the valve 61 opening toward the port 56 and the valve 60 opening away from the port 56. The pipe 59 opens into the chamber 16 and the pipe 58 opens into my improved heat-interchanging device represented at 62 and hereinafter described. The port 40 is connected with a pipe 63 also opening into the heatsinterchanger 62, and the port 41 connects with a pipe 64 which opens into the pipe 24 and thus communicates with the interior of the chamber 16.

Our improved heat-interchanger comprises a plurality of concentrically disposed tubes 65, 66, 67, and 68, shown as four in number, the innermost tube 65, which connects with the pipe 63 being open at its bottom 'and opening into the outermost `tube 68 which is connected near its'upper end with a pipe 69 which extends into the chamf ber 11 near the upper end thereof. The tube @,gwhich is closed at its upper end, com- /municates with the pipe 58, the lower end of this tube being open and reaching short of the bottom of the tube 67, this last-referred to tube being closed at its upper and lower -ends as vrepresentedand connected near its upper end with a pipe 70 which opens into the chamber 11 and terminates at its lower,

of this chamber.

Thel coil 20 is connected at its upper end with /a pipe 71 which is connected with the eXhai/ist-port 44 of the pump, and at its lower end with a pipe 72 whlch opens into the lower end of the coil 18, the latter at its upper end discharging into a pipe 73 which exhausts into a pipe 74 which would lead to a sewer. It will thus' be noted that the coils 18 and 20 are in series, and to render the operation ofthe apparatus as economical as possible, provision is thus made not only for using the water pressure which would be supplied from a suitable source thereof through a pipe 75 to the pump, as a means for producing the desired cooling action in the condenser and absorbin chamber, but also as the motive power or driving the pump,

The operation of the apparatus in so far as described is as follows: Assuming the apparatus to be empty, the operator would rst charge the generating-chamber and absorbing chamber 1.1 and 16, respectively, with a solution of ammonia of about 28 per cent. strength, as is commonly used. The burner 14 would then be lighted and the pumping) mechanism hereinbefore described started y allowing water pressure to ow into the valve-casing of the motor, the spent water therefrom flowing through the coils 18 and 20 of the condensing and absorbing chambers. Under the action of the heat applied to the chamber 11 theammonia in the. solution therein gasifies and passes upwardly through the pipes 26 into the box 27 and thence into the pipe 28 from which it -lows into the condensing chamber 19. The ammonia-gas thus produced liquefics at about one hundred pounds pressure when subjected to the cooling eli'ect of the water in the coil 20, when the water supplied to this coil is of substantially the same temperature as water furnished by street-mains, and thus the liquid in the tank 11 in the `operation of the apparatus is under about one-hundred pounds pressure. The liquid ammonia in the condensing chamber. 20

escapes past the expansion-valve 23V ermitting it to expand and become gas wA ich in passing through the coil 21 producesl the desired refrigerating action, the lspent aInmonia-gas passing thence through the pipe 24 past a check-valve 76 therein into the spray-head 25 from which it discharges into the liquor in the absorbing chamber 16, the cooling effect produced by the coils 18 o erating to absorb the heat produced by t e mixture of the ammonia-gas with the liquor in the chamber 16.

The operation of the pumping mechanism is as follows: Assuming the pump to be in the position illustrated in Fig. 2, in which case the pistons 33 and 34 are moving to the left in Fig. 2 and the piston-valve 37 occupies the position therein illustrated, in which position the ports 39 and 40 are in communication with each other through the medium of the openings 38 in thejpistonvalve 37, the piston 34 drives the liquor in the left-hand end of the cylinder 32 through the passage 56 and past the ball 60 into the pipe 53 and thence into the tube 66 from which it discharges into the tube 67 and thence into the generating chamber 11. The piston 37 being in the position just illustrated', the right-hand end of the cylinder 32 is in communication with the generating chamber 1'1 through the medium of the' passage 39, the openings 38 in the piston-valve 37, the port 40, and pipes 65, 68, and 69, and

thus the piston 34, in driving the contents in the left-hand end of the cylinder 32 into the chamber 11, is aided by the exertion of the pressure from the same chamber introduced into the right-hand end of the cylinder, and thus the piston 34 may be driven by relatively 10W ower. the limit of its stroke 'to the left in Fig. 2, it opens the check-valve 54 at the left-hand end of the cylinder 31, thus permitting the fluid pressure in the cylinder 49 to escape through the passage 52, port 43 and exhaustport 44, with the result of causing the Huid pressure in the valve-casing to shift the pistons 47 and 4S, and consequently the slidevalve 45, to the left in Fig. 2 to cause the left-hand end of the cylinder 31 to communicate With the Huid pressure supply and the other end of this cylinder to be open to the exhaust 44, whereupon the pistons 33 and 34 move to the right in Fig. 2, the shifting of the pistons 47 and 48 to the left in Fig. 2 causing the piston-Valve 37 to shift in the same direction, thus closing the port 40 and opening the port 41 to the port 39. In the movement of the piston 34 to the right' in Fig. 2, the suction producd in the left-hand end of the cylinder 32 causes a low-pressure charge of liquor to be sucked from the chamber 16 into the left-hand end of the cylinder 32 through the pipe 59 and past thervalve 61, the liquor which in the operation of the As the piston 33l nears pices ai to thema 'it F1 2 enters the right-hand end of the cylinl er"32, exhausting" from'the -latter through the passage 39 and port'.41 and 'thencejinto' the pipes 64 and 24 to the'absorbingfchamber 16. Upon the next reversal'of the movement of the piston 34 the low-pressure lcharge sucked into ythe left-hand end of the cylinder 32 in the operation just stated is forced into the generating chamber 11 as hereinbefore stated, these operations continuing so long as the pump actuates. It will be understood from the description just given that upon each movement of the piston 34 tothe right in Fig. 2 a charge of low pressure liquor is sucked from the low pressure chamber l116 into the cylinder 32 and that the charge introduced into the right-hand end of the cylinder 32 from the high pressurechamber 11 in the preceding movement of the piston, is discharged into the low pressure chamber 16; and that upon each movement of the piston 34 to the left inFig. 2, the low pressure charge sucked into the cylinder in the previous operation of the piston, will be forced into the high pressure chamber 11 and during such movement of the piston high pressure liquor Will ow from the chamber 11 into the right-hand end of the cylinder 32, and thus the pump is never required to force the liquid against ajhigh pressure, and by circulating the liquor from one of these chambers to the other, the strength of these liquors is maintained substantially constant.

It is preferred that the volume of that portion of the piston-rod 35 which operates in the cylinder 32 be so proportioned relative to the volume of the ammonia vaporized in the chamber 11 that in the operation of the prmp it will tend to maintain the Water-levels in the chambers 11 and 16 approximately constant. Should the liquor, however, in either chamber '1I or 16 drop below a predetermined level, determined by the ends ofthe pipes 69 and 59, the pump will discontinue to pump liquid from such -chamber, but instead will pump gas, and

thus the predetermined liquid-levels 1n these chambers will be automatically maintained. It will be noted from the foregoing that the liquor discharged lfrom the chamber 11 into chamber 16 through the spray-head 25 is mixed with ammonia gas from the coil 21 before it enters the head 25, thus electing an admixture of liquid and gas beforeI it leaves the head 25 and up'on leaving the latter is sprayed into the liquor in the chamber 16 thus facilitating absorption.

In operating the generator it is necessary that the heat supplied thereto be sulfliciently low as to prevent the boiling of the Watercontent. of the liquor in the chamber 11, as the presence of water in the condensing chamber is very apt to-impair the operation of the apparatus. To render the operation izo of the apparatus automatic in this particular and to prevent the undue heating of the liquor in the chamber 11, we provide thermostatic means, a description of which is as follows: Located in the pipe 15 is a reciprocatory Valve 77 adapted to lbe yieldingly held to its seat 78 for shutting oft' the burner 14, by means of a spring 79, the outer end oi the stem 80 of the valve 77 engaging with a lover 81 fulcruined, as indicated at 82, on a bracket 83 secured to the pipe 15 and cooperating with a rod 84 loosely confined in a tube 85 extending through the chamber 11 and screwing at its open end into t-he bracket 83 as represented at 86, its opposite end being closed as indicated at 87, and free to expand and contract.

The rod 84 should be of less co-eficient of expansion than the tube 85, and these parts should be so constructed that the rod 84 may move inwardly in the tube 85 suliiciently far to permit the valve 77 to close under the act-ion of its spring 79 when the temperature of the ammonia liquor in the chamber 11 reaches a predetermined degree, which should be enough lower than the boiling point of Water under one-hundred pounds pressure, as to prevent the produc tion of water vapor.

While we have illustrated and describeda particular construction embodying our invention, we do not wish to be understood as intending to limit it thereto, as the same may be variously modified and altered without departing from the spirit thereof.

What we claim as new and desire to secure b v Letters Patentis:

1. The combination with chambers adapted to contain iiuid at diil'erent pressures, of a pump for pumping fluid from said low pressure chamber into said high pressure chamber, and vice versa, and means operating when said pump is discharging into either of said chambers to cause the charge next Ito be pumped to enter the suction end of the pump from the chamber into which the pump is discharging.

2. .The combination with chambers adapted to contain iuid at different pressures, of a pump for pumping fluid from said low pressure chamber into said high pressure chamber, and vice versa, and means operating when said pump is discharging into said high pressure chamber to cause fluid from said high-pressure chamber to enter the suction end of the pump, and when said pump is discharging into said low pressure chamber to cause fluid from said low pressure chamber to enter the suction end of the pump.

3. The combination with chambers adapted to contain fluid at dilierent pressures, of a pump for pumping fluid from said low pressure chamber into said high pressure chamber, and vice versa, comprising a cylinf der, a piston therein, means for actuatili sald piston, pipes commumcatlng withsai chambers, respectively, and opening into one end of Asaid cylinder, check-valves for controlling said pipes, other pipes communi'- cating with said chambers, respectively, and valve means for alternately opening said last referred to pipes to, the other end of said cylinder, constructed and arranged to causethe opposite ends of said cylinder to be in communication with one of said cham'- bers during-the 'operation of the pump, in one direction and in communication with the ,other of said chambers during its operation in the other direction.

4. The combination with chambers adapted to cont-ain Huid at different pressures, of a pump for pumping Huid from said low pressure chamber into said high pressure chamber, and vice versa, comprising a cylinder, al piston in Said cylinder, means for operating said piston, and means operating upon 'the movement of the piston .in .one direction to admit Huid from one of said discharge the fluid in the opposite end of said cylinder into said last referred to chamber, and upon the movement of the piston in the opposite direction to discharge the fluid thus introduced into the cylinder, to the other of said chambers and admit fluid from said last referred to chamber into the opposite end of said cylinder.

5. The combination with chambers adapted to contain Huid at diierent pressures, of a pump for pumping fluid from said low pressure chamber into said high pressure chamber and vice versa, comprising a cylinder, a piston therein, means for actuating said piston, pipes communicating with said chambers, respectively, and opening into one end of said cylinder, inwardly and out- Wardly opening check-valves for controlling said respective pipes, a valve-chamber in communication with said cylinder containing ports, pipes communicating with said chambers and ports respectively, a valve in vsaid valve chamber for alternately opening said ports to the interior of said chambers and to said cylinder, and means for actuating said valve timed with relation to vthe movement of said piston for causing said cylinder to be in communication at opposite ends with one of said chambers during the movement of the piston in one direction and with the other of said chambers upon the movement of the piston in the opposite direction. V

6. The combination with chambers adapted to .contain Huid at different pressures, of a pump for pumping fluid from said low pressure chamber into said high pressure chamber and vice versa, comprising a. lcylinder, a piston in said cylinder, means for n"causing fluid from one of said chambers to iso enter one end of said cylinder in the move-l ment of the pistonin one'direction and force the fluid thus introduced into the. cylinder into the other of said chambers when the pump is moved in the opposite direction, and means operating, upon said last referred to movement of the piston to Vintroduce into `said cylinder a charge of fluid from the chamber into which the 'pump is discharging and upon the rst referred to movement of the piston to cause said charge to be forced into the other of said chambers.

f7. In refrigerating apparatus, the com` bination of a generatin chamber, an absorbing chamber and de ydrating means in said absorbing chamber and communicating with said generating chamber.

8. In refrigerating apparatus, the combination of a generating chamber, lan absorbing chamber, and pipes in said absorbing chamber opening into said nerating chamber, but closed to said absor ing chamber for conducting the ammonia vapor from said generating chamber.

9. In refrigeratmg apparatus, the combi- -nation of a generating chamber, and. de-

hydrating means comprising a pipe opening at one end into said chamber, a gas-tight box into which said pipe, at-its opposite end,

opens, and a gas-outlet' pipe for said box.

10. In refrigerating apparatus, the combination of a generatingchamber, and dehydratin means comprising a pipe opening at one en into said chamber, a gas-tight box into which said pipe, at its op osite end, opens, a gas-outlet pipe for said ox, and a water-outlet pipe for said box. 1

11. In refrigerating apparatus, the combination of a generating chamber, and vdehydrating means comprlsing a pipe opening at one end into said chamber, a gas-tight box into which said pipe, at its opposite end, opens, a gas-outlet pipe for said box, a water-outlet pipe for said box, and means for preventing the gas from escaping through said water-outlet.

12. In refrigerating apparatus, the combination of a generating chamber, and dehydrating means comprisin a pipe opening at one end into said cham er, a gas-tight box into which said pipe, at its opposite end, opens, a gas-outlet pipe for said box, a water-outlet pipe for said box, and a waterseal for said water-outlet for preventing the escape of gas through said water-outlet.

13. In refrigeratmg apparatus, the combination of a generating chamber, and dehydrating means comprising a pipe o ening at one end into said chamber, a gas-tig tbox into which 'said pipe, at its opposite end, opens, and a gas-outlet pipe for said box depending into the latter. i

14. In refrigerating apparatus, the combination of a generating chamber, and dehydrating means comprising a pipe openingl at one end into said chamber, a gas-tight box into which said pipe, at its opposite end, opens,A a gas-outlet pipe for said box extending below the top ofthe latter, and a water-outlet pipe for said box.

15. In refrigerating apparatus, the combination of a generating chamber, and dehydrating means comprising a pipe opening at one end vinto said chamber, a gas-tight box into which said pipe, at its opposite end, opens above the bottom of the latter and a gas-outlet pipe 4for .said box extendin below the top of the latter and the top o said {inst-named pipe.

'16. In refrigerating apparatus, the com- 80 bination of a generating chamber, and dehydrating means' comprising a pipe opening at one end -into said chamber, a gas-tight box into which said pipe at its opposite end, opens above the bottom of the latter, a gas- 35 outlet pipe' for said box extending below the top .of the latter and the top of said firstnamed pipe,'and a water-outlet for said'box.

17.In refrigerating apparatus, the combination of a generating chamber, and de- .90 hydrating-means comprising a pipe opening at one end into said chamber, a gas-tight box into which said pipe at its opposite end, opens above the bottom of the latter, a gas- -outlet pipe for said box extending below the top of the latter and the top of said first- 'named pipe, a water-outlet pipe communi'- cating with said box, and a water-seal for saidwater-outlet pipe.

- 18. In refrigerating apparatus, the combination of a generating chamber containing a' gas-outlet, and an absorbing chamber su perposed on said generating chamber, the bottom of said'absorbing chamber constituting the top of said generating chamber, 10.5 whereby the relatively cool topeof said generating chamber operates to condense watervapors contacting therewith.I

19. In refrigeratingjapparatus, the combination of a generating chamber containing a gas-outlet, an absorbing chamber superposed on said generating chamber, the bottom of said absorbing chamber constituting the top of said generating chamber, whereby the relatively cool top of said generating 1N bination of a generating chamber, an absorbing chamber, means for condensing the ammonia gas generated in said first-named l chamber, a refrigerating coil connected 'with the supply'of ammonia in said condenser, a spraying device in said absorbing chamber, means for discharging liquor from said generating chamber into saidI absorbing chamto be 4supplied to said sprayingfdevice'with.

the gas from said coil before their discharge through said spraying device.

21. In refrigerating apparatus, the combination of a generating chamber, an abf sorbing chamber, means for condensing the ammonia gas generated in said first-named chamber, a refrigeratng coil connected with the supply ofammon'ia in said condenser, a

spraymg device in said absorbing chamber,

a pipe for conducting liquor from said generating chamber into said spraying devicei 15 and a pipe connected withsaid first-name pipe and said coil, for the'purpose set forth.

JOHN ZANDER. JOHN LEVEY. In presence of- W. B. DEAnBoizN,

O. C. Avisue.

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