SE201900C1

SE201900C1 -

Info

Publication number: SE201900C1
Authority: SE
Publication date: 1965-01-01

Description

Uppfinnare: J W Endress ,och T M Townsend Prioritet begtird Iran den 3 februari 1958 (USA) Foreliggande uppfinning avser en anordning for avtappning av icke kondenserbara gaser och atervinning av med de icke kondenserbara gaserna blandat koldmedium fran ett kylsystem. Inventors: J W Endress, and T M Townsend Priority Begtird Iran, February 3, 1958 (USA) The present invention relates to a device for draining non-condensable gases and recovering refrigerant mixed with the non-condensable gases from a cooling system.

I kylsystem sasom kompressor- och absorptionkylsystem komma luft, vattenanga och andra frammande amnen att med tiden succossivt lacka in i eller bildas i systemet och detta medfOr att systemet ej fungerar pa ett tillfredsstallande satt pa grund av att icke kondenserbara gaser paverka varmevaxlingsfOrhallandet mellan k81d- och kondenseringsmedierna eller det avkylda mediet. I sadana kylsystem orsakar vatten korrosion och pa- verkar varmevaxlingen mellanoch kon- denseringsmedierna eller det avkylda mediet. In cooling systems such as compressor and absorption cooling systems, air, water vapor and other foreign substances will eventually successively leach into or form in the system and this means that the system does not work satisfactorily due to non-condensable gases affecting the heat exchange ratio between k81d and the condensing media or the cooled medium. In such cooling systems, water causes corrosion and affects the heat exchange between the condensing media or the cooled medium.

Manga system ha redan foreslagits, vilka aro avsedda for avtappning av dessa frammande amnen frail ett kylsystem och for underlattande av atervinning av med de frammande amnena blandat koldmedium. Salunda ha i sadana anordningar anvants ett hjalpkompressorkylsystem f8r att satta igang en stromning av icke kondenserbara gaser fran det primara kylsystemet och for att avkyla och kondensera dessa icke kondenserbara gaser. De h8gre tillverknings- och underhallskostnaderna, vilka orsakas av nodvandighet av ett extra avtappningssystem for ktildmediet Aro oundvikliga. I andra system anvandes Aug- och vattenstralpumpar, vilka omojliggora en Atervinning av koldmediet. Many systems have already been proposed which are intended for draining these foreign substances from a cooling system and for facilitating the recovery of refrigerant mixed with the foreign substances. Thus, in such devices, an auxiliary compressor cooling system has been used to initiate a flow of non-condensable gases from the primary cooling system and to cool and condense these non-condensable gases. The higher manufacturing and maintenance costs, which are caused by the necessity of an additional drainage system for the cooling medium, are inevitable. In other systems, Aug and water jet pumps were used, which made it impossible to recover the refrigerant.

Foreliggande uppfinning avser salunda en anordning for att avtappa icke kondenserbara gaser och frammande amnen fran kylsystemet och darefter avskilja det avtappade kOld- mediet Iran de frammande amnena och att sakerstalla koldmediets aterforande till kylsystemet, varvid forlu.ster av koldmedium pa grund av avtappningen minskas till ett minimum. Avtappnings- och atervinningssystemet är enkelt och bestar av ett minimum delar. The present invention thus relates to a device for draining non-condensable gases and foreign substances from the cooling system and then separating the drained refrigerant from the foreign substances and for ensuring the return of the refrigerant to the cooling system, whereby losses of refrigerant due to draining are reduced to a minimum. The bottling and recovery system is simple and consists of a minimum of parts.

En anordning enligt uppfinningen for avtappning av icke kondenserbara gaser och atervinning av med de icke kondenserbara gaserna blandat koldmedium fran ett kylsystem, vilket omfattar en kondensor, en evaporator, ett, en gasavskiljningskammare utgorande, holje °eh en fOrbindelseledning mellan namnda kammare och kondensorn for tillforsei till kammaren fran kondensom av de icke kondenserbara gaserna och medryckt anga, varjamte gasavskiljningskammaren är forsedd med en kylslinga far de medryckta a'ngornas kondensering och darigenom avskiljning fran de icke kondenserbara gaserna samt med en ledning for kaldmediekondensatets overforande till evaporatorn, kannetecknas vasentligen av en i en utloppsledning fran gas avskiljningskammaren till yttre luften anordnad, av en regleranordning styrd ventil for reglering av utstromningen av de icke kondenserbara gaserna genom ledningen, varvid regleranordningen innefattar tvenne organ, av vilka det ena organet är anordnat att paverkas av en pa forhand bestamd tryckskillnad mellan kondensoms tryck och gasavskiljningskammarens tryck, och det andra organet att paverkas av en pa forhand bestamd tryckskillnad mellan kondensorns tryck och evaporatorns tryck. An apparatus according to the invention for draining non-condensable gases and recovering refrigerant mixed with the non-condensable gases from a cooling system, which comprises a condenser, an evaporator, a gas separation chamber, a housing or a connecting line between said chamber and the condenser for supply. to the chamber from the condenser of the non-condensable gases and entrained steam, and the gas separation chamber is provided with a cooling coil for the condensation of the entrained vapors and thereby separation from the non-condensable gases and with a line for the transfer of the cold medium condensate to the evaporator. an outlet line from the gas separation chamber to the outside air, arranged by a control device controlled valve for controlling the outflow of the non-condensable gases through the line, the control device comprising two means, one of which means is arranged to be influenced by a determined pressure difference between the pressure of the condenser and the pressure of the gas separation chamber, and the second means to be affected by a predetermined pressure difference between the pressure of the condenser and the pressure of the evaporator.

En vidareutformning av uppfinningen kannetecknas av att ventilen utgores av en elek- Dupt. kl. 17 a: 8/01 2 tromagnetiskt reglerad ventil, varvid de hada organen i regleranordningen utgoras av tryckdifferentialstromstallare, vilka aro seriekopplade med ventilens magnetspole och sa anordnade, att den av tryckskillnaden mellan kondensorns tryck och gasavskiljningskammarens tryck paverkade stromstallaren vid igangsattning av kylsystemet Hiles sluten och den andra stromstallaren Oppen, varvid sistnamnda stromstallare slutes, nar en pa for-hand bestamd tryckskillnad mellan kondensorns tryck och evaporatorns tryck har uppn.atts, med verkan att ventilen oppnas, sà att de icke kondenserbara gaserna utstromma fran gasavskiljningskammaren, och forblir oppen, tills en pa forhand bestamd tryckskillnad mellan kondensorns tryck och gasavskiljningskammarens tryck liar uppnatts, varefter den av denna tryckskillnad paverkade strOmstallaren oppnas, sa att ventilen stanges, och forblir oppen, tills en ytterligare, pa forhand bestamd tryckskillnad mellan kondensorns tryck och gasavskiljningskammarens tryck har uppnatts, dd strOmstallaren ater slutes med pafoljd att ventilen oppnas, och att regleringsforloppet for den av tryckskillnaden mellan kondensorns tryck och gasavskiljningskammarens tryck paverkade stromstallaren periodiskt upprepas under systemets drift. A further embodiment of the invention may be characterized in that the valve is constituted by an electric dupt. at 17 a: 8/01 2 tromagnetically controlled valve, the main means in the control device being pressure differential switches, which are connected in series with the solenoid of the valve and arranged so that the pressure difference between the pressure of the condenser and the pressure of the gas separation chamber affected the switch at start-up of the cooling system. the second switch Open, the latter switch being closed when a predetermined pressure difference between the pressure of the condenser and the pressure of the evaporator has been reached, with the effect that the valve is opened so that the non-condensable gases flow out of the gas separation chamber, and remain open until a predetermined pressure difference between the pressure of the condenser and the pressure of the gas separation chamber is reached, after which the switch affected by this pressure difference is opened so that the valve closes, and remains open until a further predetermined pressure difference between the condenser pressure and the gas separation chamber ns pressure has been reached, when the switch is closed again with the consequence that the valve is opened, and that the control process for the switch affected by the pressure difference between the pressure of the condenser and the pressure of the gas separation chamber is periodically repeated during operation of the system.

Uppfinningen kommer nedan att narmare beskrivas med hanvisning till den bifogade ritningen. Figuren visar en schematisk vy av den i ett kompressorkylsystem anordnade avtappnings- och atervinningsanordningen. The invention will be described in more detail below with reference to the accompanying drawing. The figure shows a schematic view of the draining and recovery device arranged in a compressor cooling system.

Enligt ritningen bestar kylsystemet 10 av en kompressor 11, en kondensor 12, vars behallare 13 leder till en ekonomiser 14, som matar kOldmedium till en evaporator eller avkylare 15, varvid koldmediet snabbt kyles i ekonomisern och angan ledes till andra kompressionssteget hos kompressorn 11 genom ledningen 14' sasom visas i den amerikanska patentskriften 2 277 617. 1 kylaren 15 utsattes koldmediet for varmevaxlingsverkan med ett medium, som skall kylas, varvid den sa bildade kylangan genom ledningen 16 ledes till det forsta kompressionssteget hos kompressorn 11. En avtappningsledning 18, som är forsedd med en strypoppning 19, ett filter 19' och en ventil 19", forbinder kondensorns 12 iivre del med avskiljningskammaren 20. According to the drawing, the cooling system 10 consists of a compressor 11, a condenser 12, the container 13 of which leads to an economizer 14, which feeds refrigerant to an evaporator or cooler 15, the refrigerant being rapidly cooled in the economizer and the steam being led to the second compression stage of the compressor 11 through the line 14 'as shown in U.S. Pat. No. 2,277,617. In the cooler 15, the refrigerant is subjected to the heat exchange action of a medium to be cooled, the cooling steam thus formed being led through line 16 to the first compression stage of compressor 11. A drain line 18, which is provided with a throttle port 19, a filter 19 'and a valve 19 ", the upper part of the condenser 12 connects to the separation chamber 20.

Avskiljningskammaren. 20 bildas av ett hOlje 21. En kondenseringsslinga 23 är lampligen anordnad i holjets ovre del i narheten av inloppet for avtappningsledningen, sa att de i holjet inkommande gaserna omspola slingan under varmevaxling med det genom slingan genomstrommande k8Idmediet, varigenom koldmedium och vattenanga, som arc blanda de med de icke kondenserbara gaserna, kondenseras och k51dmediet och vatten avskiljas fran de icke kondenserbara gaserna. The separation chamber. A condensing loop 23 is suitably arranged in the upper part of the housing near the inlet of the drain line, so that the gases entering the housing rewind the loop during heat exchange with the cooling medium flowing through the loop, whereby cold medium and water vapor, which are those with the non-condensable gases, are condensed and the cooling medium and water are separated from the non-condensable gases.

En. skiljevagg 22 är anordnad under sling-an och tillfores den i slingan kondenserade vatskan. Ett for kompressorkylsystem vanligen anvant koldmedium utgbres av diklordifluormetan, som ej Or blandbart med vatten och tyngre an detsamma. Salunda separeras koldvatskan fran vattnet i skiljevaggen och strommar genom passagen 20' till behallaren i holjets 21 botten. En overkant 26 reglerar den mangd koldvatska, som strommar till behallaren, och hindrar vattnets passage till f8ljd av skillnaden i specifik vikt och det forhalIandet att vatskan ej ken blandas med vattnet. En flottorventil 24 i behallaren reglerar koldvatskans genomstromning fran behallaren till evaporatorn 15 via ledningen 35. Ett utjamningsror 25 Or anordnat i skiljevaggen 22 och forsett med en eller flera Oppningar, sâ att trycket i holjets ovre och nedre delar utjamnas under driften. Nar vattnet separeras fran koldvatskan uppsamlas det i skiljevaggen 22 och rinner even tuellt Over skiljevaggens 22 overkant 60 samt strommar till behallaren 61. Ett synglas 62 Or placerat intill behallaren 61 fOr kontroll av den i behallaren 61 befintliga vattenmangden. En av ventilen 31 reglerad vattenledning 30 är ansluten till behallaren 61. Nar vattnet uppsamlas i behallaren 61 manovreras ventilen 31 sa, att det bortledes fran behallaren. Avskiljningskammarens hOlje 21 star i fOrbindelse med fria luften genom en ledning 27, som Or forsedd med en normalt stangd elektromagnetisk reduceringsventil 28 fOr utslappande av icke kondenserbara gaser, vilka uppsamlas i kernmaren 20. Ventilens 28 reglering kommer nedan att fOrklaras. One. separator cradle 22 is arranged below the loop and is supplied with the liquid condensed in the loop. A refrigerant commonly used for compressor refrigeration systems is composed of dichlorodifluoromethane, which is immiscible with water and heavier than that. Salunda separates the cold water from the water in the partition and flows through the passage 20 'to the container in the bottom of the housing 21. An upper edge 26 regulates the amount of cold water flowing to the container, and prevents the passage of water due to the difference in specific gravity and the delay in the liquid not mixing with the water. A float valve 24 in the container regulates the flow of the cold water from the container to the evaporator 15 via the line 35. A leveling tube 25 Or arranged in the partition 22 and provided with one or more openings, so that the pressure in the upper and lower parts of the housing is equalized during operation. When the water is separated from the cold water, it is collected in the partition 22 and possibly flows over the upper edge 60 of the partition 22 and flows to the tank 61. A sight glass 62 Or placed next to the tank 61 to control the amount of water in the tank 61. A water line 30 controlled by the valve 31 is connected to the container 61. When the water is collected in the container 61, the valve 31 is operated so that it is diverted from the container. The housing 21 of the separation chamber communicates with the open air through a conduit 27, which Or is provided with a normally closed electromagnetic reducing valve 28 for releasing non-condensable gases, which are collected in the core mar 20. The control of the valve 28 will be explained below.

Ledningen 40 fOr koldvatskans tillforsel f5rbinder kondensorns 12 behallare 13 med kylslingan 23 i holjet 21. Ett lampligt expertsionsorgan, t. ex. en temperaturreglerad expansionsventil 41 eller backventil (icke vi-sad) Or anordnat i ledningen 40 for reglering av koldmediumtillfOrsel till slingan 23. Yen-then 41 har till uppgift att uppratthalla den onskade temperaturen i slingan for att forhindra bildning av is eller frost pa slingan eller i avskiljningskammaren. Ett temperaturkansligt organ 42 (som i figuren utgores av en bulb och ett kapillarror) Or anslutet till ventilen 41 for reglering av densammas verkan. Om sa onskas kan bulben placeras i det koldmedium, som lamnar slingans 23 ledning 50, vilken egentligen utgor sugledningen. Efter genomstromning i slingan 23 ledes köld- mediet till kylaren 15 genom ledningen 50. Den elektromekaniska ventilen 28 regleras 3 medelst tva differentialtryckstromstallare 55, 56, vilka aro seriekopplade i en ventilen 28 innefattande elektrisk krets. Stromstallaren 55 är sâ kopplad till konden.sorn 12 genom ledningen 70 och till kammaren 20 genom ledningen 71, att den paverkas av tryckskillnaden dari. Stromstallaren 56 Si sa ansluten till kondensorn 12 genom ledningen 70 och till sugledningen 50 eller evaporatorn 15 genom ledningen 73, att den paverkas av skillnaden mellan trycket I evaporatorn och i kondensorn. Bada stromstallarna 55 och 56 dro paverkade av tryckskillnaderna och reglera salunda ventilens 28 8ppnande och stangande. Lampligen are striimstallarna seriekopplade med varandra och med huvudstromstallarens sjalvhallningsspole for kylsystemet, sa att strOmstallarna far strom vid kylsystemets igangsattande. Salunda kan stromstallaren 55 regleras for stangning vid 0,55 kg/cm2 differentialtryck och for Oppning vid 1,10 kg/ cm2 differentialtryck, under det att strOmstallaren 56 kan regleras fOr stangning vid 1,65 kg/cm2 differentialtryck och for Oppning vid 1,10 kg/cm2 differentialtryck. The line 40 for the supply of the cold water box connects the container 13 of the condenser 12 to the cooling coil 23 in the housing 21. A suitable expert means, e.g. a temperature-controlled expansion valve 41 or non-return valve (not shown) Or arranged in the line 40 for regulating the supply of refrigerant to the loop 23. The function of the yen-then 41 is to maintain the desired temperature in the loop to prevent the formation of ice or frost on the loop or in the separation chamber. A temperature sensing means 42 (which in the figure consists of a bulb and a capillary tube) is connected to the valve 41 for regulating its action. If desired, the bulb can be placed in the cold medium which leaves the line 50 of the loop 23, which actually constitutes the suction line. After flowing through in the loop 23, the refrigerant to the cooler 15 is led through the line 50. The electromechanical valve 28 is regulated 3 by means of two differential pressure flow switches 55, 56, which are connected in series in a valve 28 comprising an electrical circuit. The current generator 55 is so connected to the condenser 12 through the line 70 and to the chamber 20 through the line 71 that it is affected by the pressure difference therein. The current generator 56 Si is connected to the condenser 12 through the line 70 and to the suction line 50 or the evaporator 15 through the line 73, that it is affected by the difference between the pressure in the evaporator and in the condenser. Both the current stalls 55 and 56 are influenced by the pressure differences and thus regulate the opening and closing of the valve 28. Lamply, the current stables are connected in series with each other and with the main current coil's self-sustaining coil for the cooling system, so that the current stables receive current when the cooling system is started. Thus, the current switch 55 can be adjusted for closing at 0.55 kg / cm2 differential pressure and for opening at 1.10 kg / cm2 differential pressure, while the current switch 56 can be regulated for closing at 1.65 kg / cm2 differential pressure and for opening at 1, 10 kg / cm2 differential pressure.

Bada stromstallarna, som visas schematiskt, aro identiska med undantag av att stromstallaren 55 normalt Sr stangd och strOmstallaren 56 normalt är oppen. Varje strOmstallare Si forsedd med en fOrsta balg 75 och en andra balg 76, vilka aro forbundna medelst en stang 77. En haystang 78 är anordnad pa stangen 77 och kan svanga kring punkten 79. Salunda forskjuter den av balgarna 75 och 76 Overforda tryckskillnaden stangen 77, och havarmen 78 svanger kring punk-ten 79, varvid stallararmen 80 fOrflyttas i riktning mot eller frail kontakterna 81 och kretsen oppnas eller slutes. Both the stables, which are shown schematically, are identical except that the current 55 is normally closed and the current 56 is normally open. Each generator is provided with a first bellows 75 and a second bellows 76, which are connected by means of a rod 77. A haystack 78 is arranged on the rod 77 and can pivot about the point 79. Thus, the pressure difference between the bellows 75 and 76 exceeds the pressure difference rod 77. , and the sea arm 78 pivots about the point 79, the stall arm 80 being moved in the direction of or frail the contacts 81 and the circuit being opened or closed.

Arbetssatt Det ovan beskrivna avtappnings- och Atervinningssystemet anvandes lampligen i samband med kondensorn hos ett kompressorkylsystem, i vilket vid drift kondensortrycket i allmanhet är hogre an atmosfarstrycket. Grunduppgift for avtappnings- och atervinningssystemet är att bortleda icke kondenserbara gaser och vatten Iran kylapparaten och att atervinna huvuddelen av k81dmediet, som foljer eller Ur blandat med de icke kondenserbara gaserna och vattenangorna, vilka avtappas fran kondensorn. Operated The drain and recovery system described above was suitably used in connection with the condenser of a compressor cooling system, in which during operation the condenser pressure is generally higher than the atmospheric pressure. The basic task of the drain and recovery system is to divert non-condensable gases and water to the refrigeration apparatus and to recover the bulk of the cooling medium which follows or mixed with the non-condensable gases and water vapors which are drained from the condenser.

De icke kondenserbara gaserna strava att samlas vid kondensoms topp, och vid bortledande frau kondensorn genom avtappningsledningen 18 blandas de med koldmediet och vattenanga, om vattenanga finnes i kondensorn. Ndr systemet sines i drift astadkommer kompressorn hastigt en vasentlig tryck skillnad mellan kondensorn 12 och kammaren 20. Det i kondensorn radande hogre tryc- ket tvingar de icke kondenserbara gaserna samt blandningen av koldmedium och vattenangor att passera genom ledningen 18, Opp- ningen 19, filtret 19', den Oppnade ventilen 19" och att omspola kylslingan 23, varigenom angorna kondenseras under varmevaxling med koldmediet i slingan, och koldmediet avdunstar i slingan och ledes till evaporatorn 15 genom ledningen 50. Ventilen 41 reglerar kindmediets tillforsel till slingan 23. The non-condensable gases tend to collect at the top of the condenser, and on discharging the condenser through the drain line 18, they are mixed with the refrigerant and water vapor, if water vapor is present in the condenser. When the system is in operation, the compressor quickly creates a substantial pressure difference between the condenser 12 and the chamber 20. The higher pressure in the condenser forces the non-condensable gases and the mixture of refrigerant and water vapor to pass through the line 18, the opening 19, the filter 19 ', the Opened valve 19 "and to rewind the cooling coil 23, whereby the vapors condense during heat exchange with the refrigerant in the coil, and the refrigerant evaporates in the coil and is led to the evaporator 15 through the line 50. The valve 41 regulates the supply of the cheek medium to the coil 23.

De icke kondenserbara gaserna uppsamlas vid avskiljningskammarens topp och kunna utslappas i fria luften genom avloppsledning- en 27. De kondenserade angoma, koldvatskan och vattnet uppsamlas i skiljevaggen 22 un- der kondenseringsslingan 23. KOldvdtskan av- skiljes frau vattnet i skiljevaggen 22, varvid Mildmediet, som är tyngre, faller till botten och passerar Over overkanten 26 under skilje- vaggen och kommer till koldmediumbehallaren vid kammarens 20 botten. Det bOr nam- nas att flottorventilen 24 kommer att oppnas, nar den liar upp till en tillracklig hojd genom en mangd koldmedium, vilken Or tillracklig for att sakerstalla oppnande av utmatningsledningen 35 for koldmediet, utan att kOldmediet strommar tillbaka Iran evaporatorn. The non-condensable gases are collected at the top of the separation chamber and can be released into the open air through the drain line 27. The condensed angoma, the cold water and the water are collected in the separating rock 22 under the condensing loop 23. The cold water is separated from the water in the separating rock 22, which is heavier, falls to the bottom and passes over the upper edge 26 below the separator cradle and reaches the refrigerant container at the bottom of the chamber 20. It should be noted that the float valve 24 will open when it reaches a sufficient height through a plurality of refrigerants, which is sufficient to ensure the opening of the discharge line 35 for the refrigerant, without the refrigerant flowing back to the Iran evaporator.

Vattnet, som Si Mare, uppsamlas normalt vid skiljevaggens topp, strommar Over Over- kanten 60, uppsamlas i vattenbehallaren och utmatas genom vattenledningen 30 medelst avtappningskranen 31. The water, like Si Mare, is normally collected at the top of the partition, flows over the upper edge 60, is collected in the water tank and is discharged through the water line 30 by means of the drain tap 31.

I drift Si avtappnings- och atervinningsan= ordningen forsedd med kontrollorgan for au- tomatisk avtappning av kylsystemet. Strom- stallaren 55 och strOmstallaren 56 trada i funktion vid kylsystemets 10 igangsattande, enar de lampligen are seriekopplade med hu- vudstrOmstallarens sjalvhallningsspole. Nar trycken dro huvudsakligen lika i kondensorn 12, avskiljningskammaren 20 och evapora- torn 15 vid igangsattande, Si stromstallaren 55 stangd och strOmstallaren 56 oppen. SA lange stromstallaren 55 eller 56 är oppen, for- blir ventilen 28 stangd. Ndr trycket i kondensorn iikar under normal drift hos kylsystemet stanger stromstallaren 56, varvid kretsen till ventilens 28 elektromagnet slutes, ventilen 28 8ppnas och de icke kondenserbara gaserna utmatas frau. avskiljningskammaren 20 till ytterluften genom ledningen 27. In operation Si The draining and recovery device is equipped with control means for automatic draining of the cooling system. The current switch 55 and the current switch 56 operate when the cooling system 10 is started, they are suitably connected in series with the main current coil of the main current switch. When the pressures were substantially equal in the condenser 12, the separation chamber 20 and the evaporator 15 at start-up, the current switch 55 was closed and the current switch 56 was open. SA long current switch 55 or 56 is open, valve 28 remains closed. When the pressure in the condenser rises during normal operation of the cooling system, the current switch 56 closes, closing the circuit to the electromagnet of the valve 28, the valve 28 is opened and the non-condensable gases are discharged. the separation chamber 20 to the outside air through the duct 27.

Den resniterande trycksankningen i avskiljningskammaren 20 medfor en tryckskillnad mellan avskiljningskammaren och kondensorn, varvid de icke kondenserbara gaserna avtappas Iran kondensorn. Genom denna tryckskillnad paverkas stromstallaren 55, vii-ken salter ventilens 28 elektromagnet ur funk- 4 tion, varvid ventilen 28 stanger och trycket i avskiljningskammaren 20 okar. Arbetscykeln upprepas under kylsystemets drift. The resilient pressure drop in the separation chamber 20 causes a pressure difference between the separation chamber and the condenser, whereby the non-condensable gases are drained from the condenser. Due to this pressure difference, the current generator 55 is actuated, which disables the electromagnet of the valve 28 from operation, whereby the valve 28 closes and the pressure in the separation chamber 20 increases. The work cycle is repeated during operation of the cooling system.

Foreliggande uppfinning avser salunda ett avtappnings- och atervinningssystem for bortforande av icke kondenserbara gaser frail kylsystem och aterforande till kylsystemet air det koldmedium, som är blandat med de avtappade, icke kondenserbara gaserna. Anordningen fungerar medelst tryckskillnaderna i kylsystemets kondensor och i avtappningssystemets avskilj are for astadkommande av automatisk avtappning utan anvandande av konventionella hjalpkylapparater sasom kompressorer, luftkylda kondensorer och liknande. The present invention thus relates to a draining and recovery system for removing non-condensable gases from the cooling system and returning to the cooling system in the refrigerant mixed with the drained, non-condensable gases. The device operates by means of the pressure differences in the condenser of the cooling system and in the separators of the drainage system for providing automatic draining without the use of conventional auxiliary cooling devices such as compressors, air-cooled condensers and the like.

Givetvis kunna de ovannamnda utforingsformerna modifieras pa olika salt utan att ramen for fOreliggande uppfinning overskrides. Of course, the above-mentioned embodiments can be modified on various salts without exceeding the scope of the present invention.

Claims

Patent claim:

A device for draining non-condensable gases and recovering refrigerant mixed with the non-condensable gases from a cooling system, which comprises a condenser, an evaporator, an oil separating chamber, a gas separation chamber and a connecting line between said chamber and the condenser for supply to the chamber. The condenser of the non-condensable gases is co-provided with each other and the gas separation chamber is provided with a cooling coil for the condensation of the entrained vapors and thereby separation from the non-condensable gases and with a line for refrigerant. The condensate is transferred to the evaporator. from the gas separation chamber (20) to the outside air, a valve (28) controlled by a control device for controlling the outflow of the non-condensable gases through the line (27), the control device comprising two means, one means (55) arranged to phverkas of a ph advance determined t jerk difference between the pressure of the condenser (12) and the pressure of the gas separation chamber (20), and the second means (56) to be affected by a predetermined pressure difference between the pressure of the condenser (12) and the pressure of the evaporator (15).

Device according to claim 1, characterized in that the valve is constituted by an electromagnetically controlled valve (28), the main means in the control device being constituted by pressure differential current switches (55, 56), which are connected in series with the solenoid of the valve and arranged so that the pressure difference between the pressure of the condenser (12) and the pressure of the gas separation chamber (20), the actuator (55) actuated when starting the cooling system is kept closed and the second actuator (56) open, the latter actuator (56) being closed when a predetermined pressure difference between the condenser (12) ) pressure and the pressure of the evaporator (15) have been reached with the effect that the valve (28) is opened, so that the non-condensable gases flow out of the frail gas separation chamber (20) and remain open until a pH predetermined pressure difference between the pressure of the condenser (12) and the gas separation chamber ( 20) pressure has been reached, after which the switch (55) affected by this pressure difference is opened, so that until the valve (28) is closed, and remains open until a further, predetermined pressure difference between the pressure of the condenser (12) and the pressure of the gas separation chamber (20) has been reached, when the switch (55) is closed again with the consequence that the valve (28) is opened, and that the control process for the switch (55) affected by the pressure difference between the pressure of the condenser and the pressure of the gas separation chamber (20) is periodically repeated during the operation of the system. Cited publications: Patents freaz Germany 519 301; USA 1 636 512, 2 062 697, 2 450 707.