US1809833A - Method of and means for stabilizing refrigerants - Google Patents

Method of and means for stabilizing refrigerants Download PDF

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US1809833A
US1809833A US116512A US11651226A US1809833A US 1809833 A US1809833 A US 1809833A US 116512 A US116512 A US 116512A US 11651226 A US11651226 A US 11651226A US 1809833 A US1809833 A US 1809833A
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liquid
refrigerant
working substance
evaporator
compressor
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US116512A
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Ransom W Davenport
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Chicago Pneumatic Tool Co LLC
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Chicago Pneumatic Tool Co LLC
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/003—Filters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/02—Materials undergoing a change of physical state when used
    • C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
    • C09K5/041—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems
    • C09K5/044—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising halogenated compounds

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  • Thisliiiventioni relates to heat transforming systems and particularly to the stabiliz- I ing ofthe working substances by which the thermodynamic effects are produced.
  • my invention consists in starting with the refrigerant as dry as possible and then preventin decomposition or the harmful effects of suc action by my improved method which comprises acting upon the refrigerant while in liquid state so as to prevent the formation of hydroxyl and to neutralize any acids which may form.
  • basic oxides such as calcium oxide (CaO) barium oxide, magnesium oxide, etc. may be used, also the corresponding hydroxides,.such as calcium hydroxide (Ca-OH), etc, Suitable means are 1926. Serial 1%; 116,512.
  • Fig. 1 is a somewhat diagrammatic view of a refrlgerating system, certain of the parts of which are partly cut away or shown in section
  • Fig. 2 is a side elevational view on an enlarged'scale of a container for the moisture absorbing or acid neutralizing material;
  • Fig. 3 is an end elevational view of the container shown in Fig. 2.
  • the heat transforming system indicated diagrammatically in Fig. 1 is of the closed cycle type comprising an evaporator or refrigerating element 4 (disposed in a suitable chamber or refrigerator A), a pump or compressor 5 withdrawing vapor from the evaporator 4 through a pipe 6 and discharging the vapor at a higher temperature and pressure through a pipe 7 into a condenser 8 where heat is extracted from the circulated working substance through a cooling medium which may be either air or water, the condenser discharging into a chamber 9 in which the condensate is collected, whence extends a conduit 10 which discharges into evaporator 4 through a suitable throttling member or expansion device 11.
  • the working substance occurs inliquid form particularly inevaporator 4 and in chamber 9.
  • the working substance may be a liquid having a low boiling point of the type used in conventional systems operating on the Clausius-Rankine cycle, such as ammoniaor sulphur dioxide, or physical mixture of a volatile liquid and a gas substantially inert to and insoluble in the liquid and in its vapor as disclosed and claimed in my copending application, Serial No. 603,998, filed November 29th, 1922, operating in accordance with the process disclosed in my copending appli cation Serial No.. 15,172, filed March 12, 1925, or a lubricating refrigerant of the type disclosed in my copending application Serial No. 60,311, filed October 3, 1925, operating in accordance with the processes set forth in my copending applications Serial No. 85,580, filed February 2,1926 and Serial No.
  • the invention particularly relates, however, to Working substances having as their major component a non-electrolyte such as carbon tetrachloride, methylene chloride, the methyl and ethyl chlorides comprising the substances known as chlorinated methyl and chlorinated ethyl derivatives.
  • a non-electrolyte such as carbon tetrachloride, methylene chloride, the methyl and ethyl chlorides comprising the substances known as chlorinated methyl and chlorinated ethyl derivatives.
  • the working substance is maintained in a stable condition and the harmful effects of decomposition are avoided by bringing the liquid refrigerant into contact with suitable material for absorbing moisture and for neutralizing any acids which may form as a result of the tendency on the part of the refrigerant to hydrolize.
  • suitable chemicals which are strongly alkaline and which have an afiinity for free moisture are utilized.
  • Compounds suitable for this purpose are the basic oxides, such as the oxidesof calcium, barium, magnesium, etc., also the hydroxides, resulting from the combination therewith of water in either its liquid or vapor state.
  • a preferred way to effect contact of the liquid refrigerant with such compounds is to immerse the latter in the liquid refrigerant.
  • Figs. 2 and 3 illustrate a container 12 of this kind which is shown as cylindrical in form but may be of any other desired shape and arranged to contain lumps 13 of the stabilizing material, such as calcium oxide (CaO).
  • CaO calcium oxide
  • Containers 12 may be inserted in the heat transforming system wherever the working substance occurs in liquid form.
  • such containers are disclosed as immersed in the liquid in evaporator member 4 and in the liquid in chamber 9. Since there is more or less dilution of the working substance by lubricant from the lubricating system and of the lubricant by refrigerant from the refrigerating system, it is also well to place a container 12 with stabilizing material therein in the lubricant body.
  • a container 12 is shown as immersed in. the sump of the crank case 5a of compressor 5.
  • the evaporator or refrigerating element 4 may have a. concentrating chamber 4a in which a body.
  • the working sub-c stance or refrigerant may have as its volatile li uid component, for example, methylene c oride and as its gaseous component air.
  • the lubricant in the sump of compressor 5 may be a heavy oil or a thin grease having a paraflin base and the lumps of stabilizin material 13 may be substantially pure and dry calcium oxide.
  • the vapor of the same together with the air in the evaporator is drawn off by compressor 5 and discharged into condenser 8 where the vapor is liquefied and collects in chamber 9 whence it passes through pipe 10 and expansion valve 11 back into the evaporator.
  • free moisture is removed from the working substance so as to maintain it in a substantially dry and stable condition at any desired number of spaced points, as in chambers 4a and 9, respectively.
  • Any lubricant which works over into the refrigerating system is also maintained in a substantially dry and stable condition by the action of the calcium oxide in container 12 in the sump of the compressor.
  • the combining of moisture with the calcium oxide produces calcium hydroxide (CaOH).
  • Any acid which may result from decomposition of either the liquid refrigerant or of the lubricant will be promptly neutralized through the action of the strongly basic calcium oxide or its hy- Thus if chlorine is liberated from methylene chloride, it will combine with the calcium oxide to form calcium chloride (CaCl
  • the quantity and area of stabilizing material should be sufiicient to cause the law of mass action to operatethat is, there should be a large excess of basic material over that theoretically calculated to complete the reactions indicated. .When this is done the inhibitin effect of the method is more complete.
  • Tfie containers 12 are by preference formed of metal screen cloth of fine mesh to retain and confine the chemical enclosed thereby.
  • means for removing moisture from the liquid working substance comprising a hollow member immersed therein, said member having a perforate wall ,and containing a basic oxide.
  • a mechanically operated heat trans forming system of. the closed cycle type utilizing a Working substance which occurs in liquid and in vapor states in various parts of the system, and means repeatedly effecting contact of the liquid workingsubstance with material having an afiinity for water thereby to dry said-working substance said means comprising a series of perforated containers 10.
  • a mechanically operated refrigerat ing system of the closed cycle type utilizing a volatile liquid as the refrigerant and hav-' ing chambers in which a part of the refrigerantgathers in liquid form, and means disposed in said chambers for extracting moisture from said lijquid refrigerant and for neutralizing. acids resul't'ing from decomposition of the refrigerant, said means comprising perforated containers inclosing a chemi cal substance adapted to supply hydroxyl 1ons.
  • a closed cycle refrigerating system having acompressor, an evaporator, and a condenser, said evaporator containing liquid refrigerant, and a container immersed in the liquid refrigerant in one of said elements and enclosing a basic oxide for maintaining the refrigerant in a substantially dry and stable condition.
  • a closed cycle refrigerating system comprising an evaporator containing liquid refrigerant, a compressor, said compressor withdrawing vaporized refrigerant from said evaporator, a condenser. into which said compressor discharges, an expansion device between said condenser and said evaporator,'a chamber for condensed refrigerant between said condenserand said device, and containers with stabilizing 'chemicals therein immersed in the liquid insaid evaporator. and said chamber.
  • a closed cycle refrigerating system bricant in order to stabilize both the refrigcomprising an evaporator containing liquid refrigerant, a compressor, said compressor wlthdrawing vaporized refr gerant from said evaporator, a condenser into which said compressor discharges, an expansion device between said condenser and said evaporator,
  • a compressor having a sump containing lulmican't, a container with one or more perforated walls in said sump, said container having a substance therein adapted to supply hydroxyl ions to said lubricant.
  • a compressor having a sump containing lubricant, and a reticulated container 29 having calcium oxide therein, said container being disposed in said sump.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Description

June 16,- 1931; R. w. DAVENPORT METHOD OF AND MEANS FOR STABILIZING REFRIGERAN'IS Fil ed June 17, 1926 INVENTOR. Ransom l V. DHI/ HP Y A TTORNEY.
Patentecl June 1931 t UNITED STATES PATENT OFFICE EANSOM W. DAV 'ENPORT OF DETROIT, MICHIGAN, ASSIGNORTO CHICAGO PNEUMATIC TOOL COMPANY, OF NEW, YORK, N. Y., A CORPORATION OF NEW J'IELR/SEY' METHOD OF AND FOR STABILIZING BEFRIGER AN'TS Applicatioii filed June 17,
I Thisliiiventionirelates to heat transforming systems and particularly to the stabiliz- I ing ofthe working substances by which the thermodynamic effects are produced. The
invention'includes both a method and the I means by whichthe method is practiced.
It has been observed thatfew if any work- 1 ing substances known or used as refrigerants remain permanently unaltered during long periods of operation.- Even-non-electrolytes such as carbon tetrachloride, methylene chloride, the methyl and ethyl chlorides, etc. tend to hydrolyze intime due to the presence of traces of moisture, and to liberate traces of chlorine which may attack metals. It has been suggestedto place in contact with the vapor of such refrigerants hygroscopic substances such as calcium chloride which are supposed to dry the vapor and the liquid which results from the condensation of the vapor to a point which should prevent hydrolysis. I have found such methods unsatisfactory since with sufficient hydroscopic material present to dry the vap'or enough of it passes with the vapor throughout the system to deposit a film of water moist material on the metal parts and accelerate rather than prevent corrosive effects.
Among the objects ofthe invention are to inhibit decomposition of working substances, to'prevent harmful effects from slight decomposition of such substances, to devise suitable means for accomplishing the above objects, and in general to improve prior methods and apparatus. Other objects will be apparent from the detailed description which follows:
Instead of attempting to dry the refrigerant in situ as heretofore proposed, my invention consists in starting with the refrigerant as dry as possible and then preventin decomposition or the harmful effects of suc action by my improved method which comprises acting upon the refrigerant while in liquid state so as to prevent the formation of hydroxyl and to neutralize any acids which may form. To this end basic oxides such as calcium oxide (CaO) barium oxide, magnesium oxide, etc. may be used, also the corresponding hydroxides,.such as calcium hydroxide (Ca-OH), etc, Suitable means are 1926. Serial 1%; 116,512.
provided for bringing such substances into.
direct contact with some or all of the liquid bodies of the working substance in the system. V
In order to illustrate the invention and the manner of its operation one concrete embodiment thereof is shown the accompanying drawings, in which:
Fig. 1 is a somewhat diagrammatic view of a refrlgerating system, certain of the parts of which are partly cut away or shown in section Fig. 2 is a side elevational view on an enlarged'scale of a container for the moisture absorbing or acid neutralizing material; and
Fig. 3 is an end elevational view of the container shown in Fig. 2.
The heat transforming system indicated diagrammatically in Fig. 1 is of the closed cycle type comprising an evaporator or refrigerating element 4 (disposed in a suitable chamber or refrigerator A), a pump or compressor 5 withdrawing vapor from the evaporator 4 through a pipe 6 and discharging the vapor at a higher temperature and pressure through a pipe 7 into a condenser 8 where heat is extracted from the circulated working substance through a cooling medium which may be either air or water, the condenser discharging into a chamber 9 in which the condensate is collected, whence extends a conduit 10 which discharges into evaporator 4 through a suitable throttling member or expansion device 11. The working substance occurs inliquid form particularly inevaporator 4 and in chamber 9. The working substance may be a liquid having a low boiling point of the type used in conventional systems operating on the Clausius-Rankine cycle, such as ammoniaor sulphur dioxide, or physical mixture of a volatile liquid and a gas substantially inert to and insoluble in the liquid and in its vapor as disclosed and claimed in my copending application, Serial No. 603,998, filed November 29th, 1922, operating in accordance with the process disclosed in my copending appli cation Serial No.. 15,172, filed March 12, 1925, or a lubricating refrigerant of the type disclosed in my copending application Serial No. 60,311, filed October 3, 1925, operating in accordance with the processes set forth in my copending applications Serial No. 85,580, filed February 2,1926 and Serial No. 88,164, filed February 15, 1926. The invention particularly relates, however, to Working substances having as their major component a non-electrolyte such as carbon tetrachloride, methylene chloride, the methyl and ethyl chlorides comprising the substances known as chlorinated methyl and chlorinated ethyl derivatives.
In accordance with my improved process,
the working substance is maintained in a stable condition and the harmful effects of decomposition are avoided by bringing the liquid refrigerant into contact with suitable material for absorbing moisture and for neutralizing any acids which may form as a result of the tendency on the part of the refrigerant to hydrolize. To this end suitable chemicals which are strongly alkaline and which have an afiinity for free moisture are utilized. Compounds suitable for this purpose are the basic oxides, such as the oxidesof calcium, barium, magnesium, etc., also the hydroxides, resulting from the combination therewith of water in either its liquid or vapor state. A preferred way to effect contact of the liquid refrigerant with such compounds is to immerse the latter in the liquid refrigerant.-
This is best accomplished by placing the stabilizing material. in a suitable container having perforated walls, or preferably made entirely of reticulated material of fine mesh. Figs. 2 and 3 illustrate a container 12 of this kind which is shown as cylindrical in form but may be of any other desired shape and arranged to contain lumps 13 of the stabilizing material, such as calcium oxide (CaO).
Containers 12 may be inserted in the heat transforming system wherever the working substance occurs in liquid form. In Fig. 1 such containers are disclosed as immersed in the liquid in evaporator member 4 and in the liquid in chamber 9. Since there is more or less dilution of the working substance by lubricant from the lubricating system and of the lubricant by refrigerant from the refrigerating system, it is also well to place a container 12 with stabilizing material therein in the lubricant body. In Fig. 1, such a container is shown as immersed in. the sump of the crank case 5a of compressor 5. When lubricating refrigerants are utilized the evaporator or refrigerating element 4 may have a. concentrating chamber 4a in which a body.
of the lubricating refrigerant gathers and one of the containers 12 for the stabilizing material is preferably placed therein.
In the system shown "the working sub-c stance or refrigerant may have as its volatile li uid component, for example, methylene c oride and as its gaseous component air.
'droxide.
The lubricant in the sump of compressor 5 may be a heavy oil or a thin grease having a paraflin base and the lumps of stabilizin material 13 may be substantially pure and dry calcium oxide. Starting with the methylene chloride in evaporator 4 the vapor of the same together with the air in the evaporator is drawn off by compressor 5 and discharged into condenser 8 where the vapor is liquefied and collects in chamber 9 whence it passes through pipe 10 and expansion valve 11 back into the evaporator. In the form shown in Fig. 1, free moisture is removed from the working substance so as to maintain it in a substantially dry and stable condition at any desired number of spaced points, as in chambers 4a and 9, respectively. Any lubricant which works over into the refrigerating system is also maintained in a substantially dry and stable condition by the action of the calcium oxide in container 12 in the sump of the compressor. The combining of moisture with the calcium oxide produces calcium hydroxide (CaOH). Any acid which may result from decomposition of either the liquid refrigerant or of the lubricant will be promptly neutralized through the action of the strongly basic calcium oxide or its hy- Thus if chlorine is liberated from methylene chloride, it will combine with the calcium oxide to form calcium chloride (CaCl The quantity and area of stabilizing material should be sufiicient to cause the law of mass action to operatethat is, there should be a large excess of basic material over that theoretically calculated to complete the reactions indicated. .When this is done the inhibitin effect of the method is more complete. Tfie containers 12 are by preference formed of metal screen cloth of fine mesh to retain and confine the chemical enclosed thereby.
From the above it will be apparent that the method of stabilizing working substances herein disclosed operates through removing Ill) all free moisture from both the circulated working substance and from any other substance which may be'mingled therewith by intent or leakage and by promptly neutralizing all acid products of decomposition, that the effects sought are readilyobtained by placing suitable chemical materials in contact with the liquid working substance, and
that the enclosing of such chemicals in suitable containers prevents the dissipating of the chemicals through the system and facilitates the renewal of the active ingredients.
While but one form of the invention has been herein shown and described it is to be understood that the invention is not limited to the specific details thereof but covers all changes, modificaitons, and adaptations withv in the scope ofthe appended claims.
I claim as my invention: 1. In a heat transforming system involvrea'ctin with water, the method of inhibiting the change of state of a liqiud' capable of ing sai .reaction which consists in repeatedly bringing said liquid into contact with a substance adapted to supply hydroxyl ions thereto. 7,
2. The method ofgstabilizing refrigerants of the chlorinated' hydrocarbon type which comprises bringii'ig'the liquid refrigerant repeatedly into contact with a basic oxide.
3. In a heatztransforming system utilizing methylene,{chloride as the working substance, the method of maintaining the latter in stable condition which comprises repeatedly bringing the working substance in liquid state into contact with a basic oxide.
4. The. method of stabilizing refrigerants of the chlorinated hydrocarbon type which comprises bringing the liquid refrigerant repeatedly into contact with substantially pure and dry calcium oxide.
5. In a heat transforming system utilizing methylene chloride as the working substance, the method of maintaining the latter in stable condition which comprises repeatedly bringing the working substance in liquid state into contact withsubstantially pure and dry calcium oxide.
6. In the method of producing heat transforming effects by circulating in a closed cycle a working substance which occurs in liquid and in vapor states in various parts of the cycle, that step in the method-which comprises subjecting the working substance while in liquid state to the action of a basic oxide to extract moisture from the working substance. V I
7 In the method Tof producing heat transforming effects by circulating in, a closed cycle aworking substance which occurs in liquid and in vapor states'in various parts of the cycle, that step in the-method which comprises subjecting the' working substance while in liquid state to the action of a. basic hydroxide in order to neutralize any acid resulting from decomposition of the.working substance.
- 8. In a mechanically operated heat transforming system of the closed cycle type uti lizing a working substance which occurs in liquid and in vapor states in various parts of the system, means for removing moisture from the liquid working substance comprising a hollow member immersed therein, said member having a perforate wall ,and containing a basic oxide.
9. In a mechanically operated heat trans forming system of. the closed cycle type utilizing a Working substance which occurs in liquid and in vapor states in various parts of the system, and means repeatedly effecting contact of the liquid workingsubstance with material having an afiinity for water thereby to dry said-working substance said means comprising a series of perforated containers 10. In a mechanically operated refrigerat ing system of the closed cycle type utilizing a volatile liquid as the refrigerant and hav-' ing chambers in which a part of the refrigerantgathers in liquid form, and means disposed in said chambers for extracting moisture from said lijquid refrigerant and for neutralizing. acids resul't'ing from decomposition of the refrigerant, said means comprising perforated containers inclosing a chemi cal substance adapted to supply hydroxyl 1ons.
11. in a mechanically operated refrigerating system of the closed cycle type utilizing a volatile liquid as the refrigerant and having a lubricating system containing lubricant, and means comprising containers of reticulated material disposing moisture absorbing and acid neutralizing material in contact with the liquid refrigerant and .with the-luerant and the lubricant.
12; A closed cycle refrigerating system having acompressor, an evaporator, and a condenser, said evaporator containing liquid refrigerant, and a container immersed in the liquid refrigerant in one of said elements and enclosing a basic oxide for maintaining the refrigerant in a substantially dry and stable condition.
13. A closed cycle refrigerating system comprising an evaporator containing liquid refrigerant, a compressor, said compressor withdrawing vaporized refrigerant from said evaporator, a condenser. into which said compressor discharges, an expansion device between said condenser and said evaporator,'a chamber for condensed refrigerant between said condenserand said device, and containers with stabilizing 'chemicals therein immersed in the liquid insaid evaporator. and said chamber. i f
14. A closed cycle refrigerating system bricant in order to stabilize both the refrigcomprising an evaporator containing liquid refrigerant, a compressor, said compressor wlthdrawing vaporized refr gerant from said evaporator, a condenser into which said compressor discharges, an expansion device between said condenser and said evaporator,
: a chamber for condensed refrigerant between said condenser and said device, said compressaid refrigerating and of said lubricating systems to mantain both the lubricantand the refrigerant in stable condition.
15. In a mechanically operated refrigerating system having heat transforming means and a compressor provided with a lubricating v system for lubricating the parts thereof,
means disposing moisture absorbing and acid neutralizing material in contact with the lu bricant to stabilize the same.
16. In a mechanically operated refrigerating system having heat transforming ele- L3 ments and including a compressor having a sump containing lubricant, means subjectlng said lubricant to the action of a basic oxide to maintain the same in stable condition.
17. In a mechanically operated refrigerating system having heat transforming means and includin a compressor having a sump containing lulmican't, a container with one or more perforated walls in said sump, said container having a substance therein adapted to supply hydroxyl ions to said lubricant.
18. In a mechanically operated refrigerating system having heat transforming means, a compressor having a sump containing lubricant, and a reticulated container 29 having calcium oxide therein, said container being disposed in said sump.
Signed by me at Detroit, Wayne County, Michigan, this 14th day of June, 1926.
RANSOM W. DAVENPORT.
US116512A 1926-06-17 1926-06-17 Method of and means for stabilizing refrigerants Expired - Lifetime US1809833A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2537815A (en) * 1948-02-09 1951-01-09 Jacob A Detherow Gas distribution method and apparatus
US2548335A (en) * 1947-04-24 1951-04-10 Weatherhead Co Refrigeration accumulator and dehydrator
US2563764A (en) * 1946-08-12 1951-08-07 Shell Dev Prevention of corrosive wear of moving metal parts
US2589457A (en) * 1946-12-16 1952-03-18 Tresco Inc Refrigerant separator and dehydrator
US2645912A (en) * 1949-11-09 1953-07-21 Borg Warner Low side drier
US2658359A (en) * 1949-02-17 1953-11-10 Artkraft Mfg Corp Evaporator
US2988903A (en) * 1958-09-02 1961-06-20 James H Bergman Low voltage miniature freezing unit
US3119244A (en) * 1961-05-22 1964-01-28 Emil L Fabian Refrigerant treating element and method of refrigerant treatment
US3357799A (en) * 1962-12-06 1967-12-12 Allied Chem Drying liquid ammonia
US3633377A (en) * 1969-04-11 1972-01-11 Lester K Quick Refrigeration system oil separator
EP1464901A2 (en) * 2003-04-03 2004-10-06 Behr GmbH & Co. KG Refrigerant condensing device
EP3062043A3 (en) * 2015-02-27 2017-03-01 Mahle International GmbH Dryer

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563764A (en) * 1946-08-12 1951-08-07 Shell Dev Prevention of corrosive wear of moving metal parts
US2589457A (en) * 1946-12-16 1952-03-18 Tresco Inc Refrigerant separator and dehydrator
US2548335A (en) * 1947-04-24 1951-04-10 Weatherhead Co Refrigeration accumulator and dehydrator
US2537815A (en) * 1948-02-09 1951-01-09 Jacob A Detherow Gas distribution method and apparatus
US2658359A (en) * 1949-02-17 1953-11-10 Artkraft Mfg Corp Evaporator
US2645912A (en) * 1949-11-09 1953-07-21 Borg Warner Low side drier
US2988903A (en) * 1958-09-02 1961-06-20 James H Bergman Low voltage miniature freezing unit
US3119244A (en) * 1961-05-22 1964-01-28 Emil L Fabian Refrigerant treating element and method of refrigerant treatment
US3357799A (en) * 1962-12-06 1967-12-12 Allied Chem Drying liquid ammonia
US3633377A (en) * 1969-04-11 1972-01-11 Lester K Quick Refrigeration system oil separator
EP1464901A2 (en) * 2003-04-03 2004-10-06 Behr GmbH & Co. KG Refrigerant condensing device
EP1464901A3 (en) * 2003-04-03 2005-08-24 Behr GmbH & Co. KG Refrigerant condensing device
EP3062043A3 (en) * 2015-02-27 2017-03-01 Mahle International GmbH Dryer

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