US1911464A - Refrigerating system - Google Patents

Description

May 30, 1933. s. A. PEARSON REFRIGERATING SYSTEM Filed April 12. 1929 2 Sheets-Sheet l Exmwszuu Maw/c HEFHIGERATING SYSTEM Filed April 12. 1929 2 Sheets-Sheet IIIIIIIIAWII'IIIIIIIJ v 92 6 J2 96 3 a? 64 Patented May 30, 1933 PATENT OFFICE SWAN A. PEARSON, OF CHICAGO, ILLINOIS REFBIGEBATING SYSTEM Application filed April 12, 1929. Serial No. 354,479.

This invention relates to refrigerating systems and more particularly to a generally improved apparatus for removing foul or other forei n gases from the system.

5 I shall (ascribe the invention in connection with the removal of deleterious gases and shall refer to certain illustrative examples; but it is to be understood that the invention is not limited to the removal of any particular gases but may be employed for removing any objectionable fluids whether in vapor or gaseous sta It 15 well understood in the art that in a refrigerating system the higher the pressure the greater the refrigerating action in the system. The presence of noncondenisible or relatively fixed gases in the system tend to reduce the capacity and efliciency of the system and are frequently dangerous; and 3 it is the object of the present invention to provide a generally improved, simplified, efficient and inexpensive method for removing the foul gases or other objectionable fluids without throttling or reducing the desired high pressure in the system.

Another object is to return the liquid from the purging chamber through a path other than the path of gas entry into the chamber. Another object is the provision of an apparatus for removing foul or other objectionable fluids with a minimum of refrigerant loss. Another object is the provision of an improved counter-current cooling eflect within the purging apparatus, and a more uniform distribution of the foul or objectionable ases about the cooling coils within the purging chamber. Another object is the provision of a trapping effect upon the foul gases within the purging chamber and a further object is the provision of an improved foul gas discharge regulator for removing the foul or other objectionable fluids automatically and without manual attention as well as without loss of an appreciable amount of the refrigerant.

Other objects and advantages of the present invention will more fully appear from the following detailed description taken in connection with the accompanying drawings which illustrate one embodiment of the invention and in which;

Fig. 1 is a view illustratin a more or less diagrammatic embodiment o the present invention with the purging chamber and cooling coil therefor in section;

Fig. 2 is a vertical sectional view through the automatic foul gas discharge regulator taken on the line 2-2 of Fig. 1; and

Fig. 3 is a fragmentary detail section taken on the line 3-3 of Fig. 2.

Referring to the drawings, the particular apparatus selected for illustration comprises a chamber 10. A pipe 11 leading from the receiver of the refrigerating system or from any other source which might have foul or other objectionable gases or fluids which it is desired to remove enters the chamber 10 preferably at the top thereof as shown. Foul gases are commonly trapped or collected in the top of the receiver and in that case the pipe 11 will preferably be connected with and lead from the to ofthe receiver. It is to be understood, however, that this is merely illustrative. Sometimes these ases are trapped in the condenser and in $110 case the pipe 11 will have connection with the particular part of the system from which it is desired to remove the foul gases or fluids. Ordinarily the liquid in pipe 11 will be under full condenser or receiver ressure.

The details of the re rigerating system per se form no part of the resent invention and may vary widely. The apparatus of the present invention may be quickly and easily installed with any existing or suitable refrigerating system, and where necessary the details of the apparatus of the present invention may be varied to accommodate it to different systems as desired.

So far as the details of the refrigerating s 'stem per se are concerned, suflice it to say t at the liquid ammonia or other desired refrigerant, which may vary, is usually suplied under pressure to a suitable receiver rom the condenser (not shown) to which the ammonia or other refrigerant is usually supplied in vapor form from the usual com- 11 would lead from the condenser, it being understood that the pipe VII pressor (not shown). The liquid refrigerant is supplied from the receiver to the usual refrigerating room or ice making tanks or coils (not shown) and in operation the ammonia, gas or other refrigerant is usually supplied from the compressor to the condenser where it is reduced in temperature sufliciently to render it liquid, after which it is usually conducted into the receiver usually with the pressure maintained. From the receiver the refrigerant is usually led to the refrigerating room or ice making tank or coils where it is allowed to expand and thereby cools the room or coils, and from the refrigerating room the refrigerant is drawn into the inlet side of the compressor and the cycle is repeated.

The foregoing is merely illustrative of refrigerating systems now in use and being a matter of common knowledge, that knowledge is incorporated herein by reference and disclosure in the drawings is believed unnecessary.

In a refrigerating system there are numerous sources of 'non-condensible gas accumulations. So far as a refrigerating system is concerned, atmospheric air is considered as a non-condensible gas and it, and the other gases which will be referred to, are intended to come within the general term foul gas or foul fluid as used herein. It is practically impossible to expel all of the air from the entire system even in starting up a new system, and after operation the air enters through leaky connections and the like. Decomposition of ammonia is another source of non-condensible gas. There are others but these are illustrative and will suflice. The line 11 is preferably provided with a globe, angle or other control valve 13 and also preferably with a release valve 14 for automatically relieving or venting excessive pressures in this line as is well understood in the art.

The top of the chamber 10 is closed by a top member 15 and the bottom is closed by a bottom member 16. The top and bottom members 15 and 16 may be spot welded in place as shown at 17 in Fig. 1, or otherwise secured suitably in place. The outlet or liquid spill pipe 18 leads from the bottom of the chamber 10 and is connected, for example, to the suction line of the compressor, or with any other part of the system to which it is desired to spill or return the liquid. The pipe line 18 is preferably provided with a globe, angle or other suitable control valve 19.

The pipe 18 is preferably provided within the chamber 10 with an upstanding end terminating at a suitable height above the bottom of the chamber in an open end 20 through which liquid in the chamber 10 above said open end 20 may enter the pipe 18.

To prevent access of the gases within the chamber 10 to the top of the pipe 18 when the liquid level within the chamber 10 is relatively low, the upper end of the pipe 18 is preferably surrounded by a cup-like member 22, preferably of circular section as is the chamber 10, although this may vary. The top of this cup-like member is closed at 23 and the lower end of the surrounding side wall is Welded or otherwise suitably secured at 24 to the bottom member 16. Ports 25 through the side walls of the cup-like member 22 permit entry of the liquid from the bottom of the chamber 10 into the cuplike member 22 and to the upper end of the pipe 18. These ports 25 are preferably disposed down adjacent the bottom member 16 to be liquid sealed, even with only a relatively slight liquid level within the chamber 10.

A baiile 28, which may also be of circular section, although this may vary, is disposed preferably concentrically within the chamber 10 with its lower end open and concentrically surrounding the cup-like member 22 and terminating short of and preferably spaced above the bottom member 16 of the chamber 10.

The upper end of the baflie sleeve 28 preferably extends to the top member 15 and is welded or otherwise suitably secured thereto at 29. The baflle 28 is provided with a plurality of ports 30 arranged circularly around the baffle and preferably disposed at a level slightly above the upper open end 20 of the pipe 18 to be constantly uncovered due to the lower level liquid outlet. These ports 30 are for the entry of the non-condensible gases or at least the gases not condensed within the annular condensing space 32 between the baflle 28 and the wall of the chamber 10 through the ports 30 into the interior space 34 enclosed by the baflle 28. The non-condensed gases thus delivered to the space 34 are discharged into a foul gas outlet 36 leading from the top of the space 34 through the top member 15.

It will be apparent that flow of gases from the condenser or receiver through pipe 11 and valve 13 provides for a slight expansion of these gases and consequent cooling, since the gases, which are under condenser pressure, are discharged into the chamber 32, which chamber is provided with cooling coils which condense a portion of these gases and cool the remainder. This condensing and cooling action will necessarily result in a reduction of pressure of the gas, in accordance with established laws of thermodynamics. Consequently there will be a small drop in pressure from the pipe 11 to the chamber 32, which will result in a cooling efl'ect, due to the expansion of the gases entering the chamber 32. However, the pressure in chambers 32 and the complementary 34, because of the restricted valved outlet, will still be considerably above atmos heric pressure, and the foul gases will be orced out through outlet 36 to the discharge valve. The pressure within the chambers 32 and 34 remains substantially constant, since any loss of pressure throughthe outlet 36 is compensated for by the fluid entering through pipe 11, and a substantially balanced pressure will be maintained during normal operation of the system.

Within the annular space 32 and the space 34 is preferably arranged an expansion or cooling coil 40, one end of which may be connected through a pipe 41 and valve 42 with the suction side of the compressor and the other end of which may be connected through an expansion valve 43 and pipe 44 with any suitable source of ammonia liquid or other refrigerant. The pipe 44 rovides the inlet to the coil 40 from the bottom of the receiver or other refrigerant source and the pipe 41 provides the outlet from the coil 40 to the inlet side of the compressor.

The foul gas outlet 36 leads through a globe, angle or other valve 48 and pipe 49 to an automatic foul gas discharge re ulator designated in its entirety at 50. T is discharge regulator 50 comprises a body part 52 having a reduced threaded stem 53 extending upwardly therefrom for receiving a head member 54 which may be screwed thereon as shown. The head member 54 is enlarged at 55 and is clamped as by means of screws 56 to the lower similarly enlarged end 57 of a complementary head part 58. The head part 58 has an upwardly domed portion 59 and disposed substantially concentrically within this upwardly domed ortion 59 is a similarly domed metallic shell 60, flanged at 61 and secured at 62 to the inner edge of an annular diaphragm member 63, the outer edge of which diaphragm member 63 is tightly clam ed at 64 between the enlarged parts 55 an 5 of head members. he head member 58 with the diaphragm 63 and the domed shell which is pre erably relatively thin and of good conducting metal completely enclose a space 64' which is filled or substantially filled with an exansible fluid such as ammonia or ammonia In combination with some other fluid, altihough other fluids may be employed. The

1a leat er which is not subject to corrosion and at the same time prov1des a sensitive and readily yieldable connection between the slahell 60 and the head of the discharge reguator.

The upper enlarged part 55 of the head member 54 defines a space 68 which is in communication at 69 with interior 70 of the shell 60. A vent port 72 opens from the the valve stem is ragm 63 is preferably of rubber or space 68 out at 73 from the head member 54 for discharging the non-condensible or other foul or undesirable gases. Internally the body part 52 has a passage 75 which is adapted to communicate through a reduced co-axial passage 76 with the interior 70 of the shell 60. Internally the body part is tapered at the entry of the passage 75 to the reduced passage 76 providing a tapered seat 78 against which a tapered shoulder 79 on adapted to seat and to close ofl communication from the passage 7 5 to the space 70. Beneath the tapered seating shoulder 79 the stem 80 is flanged at 81, this flan e 81 fitting relatively snugly but having ree sliding fit in the passage 75. The lower end of the passage 7 5 is internally threaded at 82 to receive the reduced threaded stem 83 of a cap member 84 which is threaded into and closes oil the lower end of the passage 75. The body part 52 and the cap 84 may have external polygonal surfaces 85 and 86 respectively for engagement by a wrench or other suitable tool. A coiled spring 88 surrounds the stem 80 and is confined between the cap 86 and the flange 81 and normally urges the valve shoulder seat zipward toward the cooperating valve seat The pipe 49 may be threaded into the body part 52 and the gases or other fluids discharged through the pipe 49 enter the passage wa 75 through the passage way 90 shown disposed substantially normal thereto and constituting the inlet into the automatic foul gas discharge regulator.

The upper end of the valve stem 80 is re duced at 92 and this reduced upper end 92 preferably has a relatively close sliding fit in the passage 76. The periphery of that portion of the stem part 92 which operates in the passage 76 is provided with a plurality of longitudinal grooves 93 which are proportioned to provide communication between the enlarged passage 75 and the space 70 when the tapered valve shoulder 79 is unseated from the cooperating tapered seat 78 and the upper end of the stem 92 is preferably rounded at 94 and is held in contact with the upper rounded end of the shell 60 by the spring 88. The lower end of the stem 80 is reduced at 95 and is movable in an axial recess 96 in the cap member 86. The slotting of the valve stem part 92 at 93 provides the desired communication between the passage 75 and the space 70 for venting the foul gases from the space 70 through the space 69 and into the space 68 from whence said gases are discharged, for example, to the atmosphere through the ports 72.

In starting the system the foul gas discharge valve 79 is closed by backing off the hood 58 sufliciently to allow the spring 88 to seat the valve shoulder 79 upon the seat 78.

The valves 13 and 19 are nod and the expansion valve 43 is opene to permit a flow of refri ran? from. the receiver or other source t rough the coil 40 and back to the suction side of the compressor. The

expansion of the ammonia or other refrigerant in the coil 40 reduces the temperature in the chamber sufliciently that an ammonia or refrigerant vapor carried 0 with the foul or contaminating gases throu h the pipe 11 and into the top of the cham or 10 as indicated by the arrow 98 in Fi 1 is condensed. The refrigerating or cooling action in the coil 40 is referably such as to cool the liquid or fluig down to the lowest possible temperature depending u on the suction pressure of the system. is condensation of a portion of the gases and cooling of the remainder will result in a consequent lowering of the pressure, the reduction in pressure of a gas being directly proportional to a reduction in temperature. To permit backing oil the hood 58 without releasing the liquid seal between this hood and the diaphragm 63 the diaphragm may be secured marginally to the hood 58, if desired.

The opening of the valve 13 permits any foul, contaminating or other gases and any vaporized ammonia or vaporized refrigerant contained within the top of the receivor where the pipe 11 leads from the top of the receiver or contained within any other part with which the pipe 11 has communication to rise into the top of the chamber 10.

Any ammonia or refrigerant vapor is condensed and drops to the bottom of the chamber 10 as indicated at 99 in Fig. 1 and when the level of the liquid condensate rises sufficiently to enter the top of the stand pipe 20, it is returned or spilled throu h the )ipe 18 from the bottom of the chain MW 10 ack to the receiver or to any other desired or suitable part of the system.

Any gases not condensed within the annular space 32 pass around the lower end of the annular baflle 28 or where the liquid has risen above the lower end of this bafllc, as shown, pass through the ports 30 and into the space 34. It should be noted that the How of refrigerant through the coil is counter to the passage of gases or other fluids through the baflled chamber 10. The lesser cooling action provided at the top of the space 32 by the coil 40 condenses out the more readily condensible vapors or gases and the increased cooling action provided by the coil 40 downwardly through the space 32 and upwardly through the inner space 34 provides an increasing cooling action, serving to provide a more complete condensing out of the condensible vapors or gases in their passage through the chamber 10 and This counter-current effect is an space 34.

important aspect of the invention.

should also be noted that the liquid is returned or spilled back through the ipe 18 and not through the same assa e through which the gases are admitte to t e chamber l0. This is another important aspect of the invention.

The non-condensible gases or at least the gases not condensed out by the time the reach the top of the space 34 and which refer to herein as the foul gases, are discharged through the pipe 36 valve 48 and pipe 49 into the passage of the discharge regulator through the passage 90. After starting, the hood 58 of the dlschar e regulator is screwed down enough to bac ofi the valve shoulder 79 from the seat 78 just sufliciently to take 011' the foul gases, say, as formed, and without appreciable loss of ammonia gas. The foul gases entering the space 75 pass along the upper reduced end of the valve 92 through the grooves 93 and into the space 70 from where they are permitted to escape through the annular space 69, space 68, and through the ports 72 to atmosphere. If appreciable ammonia or other refrigerant enters the discharge regulator it will pass with the foul gases up into the space 70 and by an expansion effect or otherwise will reduce the temperature within the space 70. It is to be understood that the foul gases entering the chamber 32 and passing up through the chamber 34 will increase in temperature after leaving the chamber 34 and will not materially affect the temperature of the liquid 64 in the expandible chamber. However, if a large percentage of vaporized liquid ammonia enters the chamber 32 from the pipe 11, its expansion upon entering the chamber after being released from the pressure that it has been subjected to in the pipe 11 Will produce a marked cooling effect. The pressure existing in the chambers 32 and 34 is above .at-

mospheric pressure, and this cooled gas,

passing through valve 79 into chamber 70, which is at atmospheric pressure, due to the outlet 72 to atmosphere, will expand further, producing a still further decrease in temperature. As is apparent, a double expansion of the refrigerant gas takes place, with a resulting cooling effect, whereas with no refrigerant gas present, the tendency is for the temperature of the foul gases to increase after leaving chamber 34. This reduction in temperature, when refrigerant gases are present, will contract the liquid within the space 64' and this contraction of this liquid will permit the valve 79 to rise under the action of the spring 88 and to seat upon the valve seat 78 and thereby automatically close the foul gas discharge regulator. For example, should the receiver fill with liquid and the condenser or drum fill with liquid ammonia or other refrigerant escaping through the automatic valve this redensate outlet leading from the bottom of ingerant will contract the expansi le liquid the receptacle.

64 and close the valve automatically against 2. The combination with a refrigerating loss of the refrigerant. system of a receptacle, a as line connecte 5 The apparatus may therefore be made to said receptacle for admitting condensable wholl automatic for automaticall opening and non-condensable gases into the interior the dlscharge re ulator and for c osing the of the receptacle, an outlet for the dischar e same automatica 1y depending upon the perof non-condensable gas from said receptac e, centage of refrigerant discharge with the means within the receptacle for cooling the foul or objectionable gases. This is-an imgases admitted therein so as to condense the 7 portant aspect of the invention. As the percondensable gas, baflie means disposed withcentage f 1 or d ib1 gases 1n the receptacle'between said gas inlet and again increases the rise in the temperature said non-condensable gas outlet, a condenwithin the space will expand the expansate outlet leading from the bottom of the 15 dible liquid in the space 64' unseating th rece tacle, means for trapping some of the valve 79 for the automatic discharge of these con ensate within the rece tacle and means foul gases to atmosphere through the ports wl hm the receptacle an adated to be sealed by the condensate trapp in the re A steady and continuous discharge of ceptacle for preventing entry into said con- 5 foul gases will take place in accordance with densate outlet of non-condensable gas ad- 35 the percenta e of non-condensible gases admitted into the receptacle. 7 mitted into ambers 32 and 34 by pipe 1 1. 3. The combination with a refrigerating If, due to lack of sufiicient cooling within system, of a purging receptacle, a generally the chamber, uncondensed refrigerant gases annular bafile forming a nerally annular "pass throu 'h the outlet 36, the discharge space within said rccptac e, said baflie'bevalve will automatically closed to premg closed at the top and open at the bottom vent loss of refri erant, this closing being to said generally annular space, a gas inlet efiected by the coo ing occasioned by the secline connected with the top of said generally 0nd expansion of the refrigerant gases as annular s ace, a foul fluld outlet adjacent they pass from chamber 34 into the chamber the top 0 the space within said enerally 68, the valve 79 seating upon the valve seat annular baflle and a liqluid outlet rom the 78, due to the contraction of liquid in the bottom of said receptac e. dome 59 of the valve. 4. The combination with a refrigerating Ordinarily, however, the reduction 1 n s stem, of a purging receptacle, a generpressure between pipe 11 and chamber 32 1s a y annular bafile forming a generally small and the cooling coils 40 will suilice, annular space within said receptacle, said together with the cooling efiected by the bailie being closed at the top and open at expansion of the gases upon the reduction the bottom to said generally annular space, in ressllre occasioned by condensation and a gas inlet line connected with the top of coo ing, to condense all the refrigerant said generally annular s ace, a foul fluid see, and only a restricted discharge of the outlet adjacent the top 0? the space within oul gases will continue to talze place said generally annular baflle, a liquid outlet The reduced stem part 92 is reduced befrom the bottom of said receptacle, said a low the grooves 93 as by means of an anliquid outlet extending up into the bottom nular slot 100 (Fig. 2) whlch rovldes for of the rece tacle and forming a liquid trap obtaining closer regulation. e foul g and a hoe surrounding said u wardl exopenings 30 throug the lower ends f th tending liquid outlet, said hood ing osed annular bafiie'28 providerestrictwn wh at the top and havingport means opening produce a more even distr butlon of h at the bottom fromsaid generally annular 5 gases about the c011 40, particularly within space i t id h l the annular space 2- 5. The combination 'th 0. refrigerating I do not intend to be limited to the plflsystem, of a purging receptacle, a generally cise details shown or des rl annular bafile forming a generally annular I claim: space within said receptacle, said baflie being 65 1. The combination with a refrigerating c osed at the top and open at th b tt t system of a receptacle, a gas line connecte f said generally annular space, a s inlet line -to said receptacle for admitting condensable o ne ted wlth the to of ud ene lly and non-condensable gases into the interior annular s ace, a foul fluid outlet adjacent of the recegtacle, an outlet for the dischar e the top 0 the space within said generally of non-con ensable gas from said receptac e, annular baflie, a liquid outlet from the botmeans within the receptable for cooling'the tom of said receptacle, said liquid outlet exs admitted therein so as to condense the tending up into the bottom'of the recggtacle condensable gas, baflle means disposed withand forming a liquid trap and a ho sur- -in the receptaclebetween said gas inlet and rounding said u wardly extending liquid "said noncondensable gas outlet and a eonoutlet, said hoo being closed at the top 131 and port means opening through said baflie above the top of said upwardly extending liquid outlet.

6. The combination with a refrigerating system, of a purging receptacle, a generally annular bafile forming a generally annular space within said receptacle, said baflle being closed at the top and open at the bottom to said generally annular space, a gas inlet line connected with the top of said generally annular space, a foul fluid outlet adjacent the too of the space within said generally annular baflle and a cooling coil convoluted throuv'h said generally annular space and through the space within said baflie, said coil having an inlet at the top of the space within the baflie and an outlet at the top of the generally annular space.

7. The combination with a refrigerating system, of a purging receptacle, a generally annular baflle forming a generally annular space within said receptacle, said bailie being closed at the top and open at the bottom to said generally annular space, a gas inlet line connected with the top of said generally annular space, a foul fluid outlet adjacent the top of the snace within said generally annular baflie, a liquid outlet extending up into the bottom of the chamber and forming a liquid trap and a hood surrounds ing said upwardly extending liquid outlet, said hood being closed at the top and a cooling coil convoluted through said generally annular s ace and throu 'h the space within said baths, said coil having an inlet at the topof the space within the baflie and an outlet at the top of the generally annular space.

8. The combination with a refrigerating system of a receptacle, bafile means extending downwardly from the top of the interior of the receptacle and dividing the interior of the receptacle vertically into an inlet chamber and an outlet chamber, said bafile means separating the inlet chamber from the outlet chamber at the top and being open for communication between the inlet and outlet chambers adjacent the bottom, a gas line connected with the top of the inlet chamber for admitting condensable and noncondensable gases into said chamber, an outlet for the non-condensable gas at the top of the outlet chamber, means within the receptacle for cooling the gases admitted therein so as to condense the condensable gas and a condensate outlet leading from the bottom of the receptacle.

9. A foul fluid discharge regulator for refri crating systems having an inlet and an out et, said regulator comprising a body part having a passage therethrough, a valve coutroll said passe and slidable therein, a hood ormmg wi said body part an enclosed chamber, a, flexible diaphragm clamped between said hood and said body partand dividing said chamber, a shell secured to said diaphragm and disposed within said hood to form an ex audible fluid chamber between the shell an the hood and in communication with the chamber on one side of said diaphra the interior of said shell bein adapted iii? communication with the valve passage throu h the bod and having communication wit the cham er on the other side of said diaphragm and a foul fluid outlet from said last side of said diaphragm chamber. j

10. A foul fluid discharge regulator for refrigerating systems having an inlet and an outlet, said part having a passage therethrough a valve controllin said passage and slidab e therein, a hoe forming with said body part an enclosed chamber, a flexible diaphragm clamped between said hood and sand body part and dividing said chamber, a shell secured to said diaphragm and disposed within said hood to form an e andible fluid chamber between the shell an the hood and in communication with the, chamber on one side of said diaphra the interior of said shell bein adapted fo communication with the valve passage throu h the bod and having communication with the cham r on the other side of said diaphr a cap member closing the one end of e passage through the body part and a spring confined by sald cap member and urging said valve member toward its seat and into cooperation with said shell. 7

11. The combination with a refrigerating system of a gurging receptacle therefor, 12. line leading om the system to the interior of said urging receptacle for discharging foul flui s from said system to the interior of said rece tacle, cooling means for the interior of the receptacle, and a liquid return line for spilling liquid from the purging receptacle inde ndently of the path of delive of the foul iiuids to said receptacle and in ependently of the cooling means for the receptacle and the connections for said coo g means. a

12 A foul fluid discharge regulator for refrigeratmg systems having an inlet and an outlet, 11 valve for said regulator, means formlng a chamber expandible and contractible with temperature variations for automatically controlling said valve, the means forming said chamber inclu a. flexible leather diaphragm disposed in e path of flow of the foul gases from the refrigerating system and through said regulator.

13. Thecombination with a refrigerating system of a receptacle 7 havinga purging chamber, a gas line connected to said chamber, means within said chamber for the gases admitted therein so as to condense the entrained condensable gas, a condensate outlet at the bottom of the purging regulator comprising a body chamber, means for tra'ping some of the condensate within sai chamber, means adapted to be sealed by the condensate trapped within the chamber for preventing entry into said condensate outlet of noncondensable gas admitted to the chamber and an outlet for the noncondensable gas.

14. The combination with a refrigerating si lstem of a receptacle having a urging c amber, means within said cham er for cooling the gases admitted therein so as to condense the entrained condensable gas, a.

condensate outlet at the bottom of the purging chamber, means for trapping some of the condensate within said chamber, means adapted to be sealed by the condensate trapped within the chamber for preventing entry into said condensate outlet of noncondensable gas admitted to the chamber, a hood over the condensate outlet and having port means below the level of the liquid adapted to tra ped within said chamber and an outlet rom the top of the chamher for non-condensable gas admitted to the chamber. In witness whereof, I hereunto subscribe my name this 8th day of April 1929.

swan A. PEARSON.

CERTIFICATE OF CORRECTION.

Patent No. 1,911,464. May 30, 1933.

SWAN A. PEARSON.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 7, line 10, claim 14, before "means" insert the words "a gas line connected to said chamber,"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 15th day o August, A. D. 1933.

M. J. Moore.

(Seal) Acting Commissioner of Patents.

chamber, means for tra'ping some of the condensate within sai chamber, means adapted to be sealed by the condensate trapped within the chamber for preventing entry into said condensate outlet of noncondensable gas admitted to the chamber and an outlet for the noncondensable gas.

14. The combination with a refrigerating si lstem of a receptacle having a urging c amber, means within said cham er for cooling the gases admitted therein so as to condense the entrained condensable gas, a.

condensate outlet at the bottom of the purging chamber, means for trapping some of the condensate within said chamber, means adapted to be sealed by the condensate trapped within the chamber for preventing entry into said condensate outlet of noncondensable gas admitted to the chamber, a hood over the condensate outlet and having port means below the level of the liquid adapted to tra ped within said chamber and an outlet rom the top of the chamher for non-condensable gas admitted to the chamber. In witness whereof, I hereunto subscribe my name this 8th day of April 1929.

swan A. PEARSON.

CERTIFICATE OF CORRECTION.

Patent No. 1,911,464. May 30, 1933.

SWAN A. PEARSON.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 7, line 10, claim 14, before "means" insert the words "a gas line connected to said chamber,"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 15th day o August, A. D. 1933.

M. J. Moore.

(Seal) Acting Commissioner of Patents.

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