EP1775530B1 - Method for producing a device for collecting and drying a refrigerant in an air conditioning unit - Google Patents

Method for producing a device for collecting and drying a refrigerant in an air conditioning unit Download PDF

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Publication number
EP1775530B1
EP1775530B1 EP05022246A EP05022246A EP1775530B1 EP 1775530 B1 EP1775530 B1 EP 1775530B1 EP 05022246 A EP05022246 A EP 05022246A EP 05022246 A EP05022246 A EP 05022246A EP 1775530 B1 EP1775530 B1 EP 1775530B1
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EP
European Patent Office
Prior art keywords
coolant
housing
collecting
drying
base element
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Not-in-force
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EP05022246A
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German (de)
French (fr)
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EP1775530A1 (en
Inventor
Wolfgang Prinz
Norbert Grossmann
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COEXAL GmbH
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COEXAL GmbH
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Priority to EP05022246A priority Critical patent/EP1775530B1/en
Priority to AT05022246T priority patent/ATE380990T1/en
Priority to DE502005002246T priority patent/DE502005002246D1/en
Publication of EP1775530A1 publication Critical patent/EP1775530A1/en
Application granted granted Critical
Publication of EP1775530B1 publication Critical patent/EP1775530B1/en
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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
    • F25B43/006—Accumulators
    • 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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide

Definitions

  • the present invention relates to a method of manufacturing a device for collecting and drying a coolant in an air conditioner.
  • collectors / dryers which serve to hold the liquid coolant.
  • the refrigerant that has not been completely converted into gas by the evaporator is collected so that no liquid gets to the compressor. Since the amount of circulating coolant varies depending on the heat load, these collectors / dryers are essential. Usually, foreign matter is also removed therefrom, for example by means of a sieve, and the integrated dryer serves to absorb the moisture from the coolant. This is necessary because e.g. Moisture gets into the system during installation.
  • Automotive air conditioning systems currently on the market typically use R134a refrigerant.
  • the devices used for collecting and drying the coolant are made of stainless steel or aluminum alloys from a housing and a lid.
  • the housing and the lid are replaced after assembly of the fixtures, i. of the filter, integrated piping, desiccant container, etc. are welded together.
  • CO 2 air conditioning systems for motor vehicles have already been produced for test purposes and in small series. Such systems require a very high pressure to function in relation to the currently used refrigerant R134a. Thus, very high demands are made on the components of the system with regard to the bursting behavior. Due to the increased pressure, the housings of the collectors / dryers, which are produced by the usual method, must be particularly thick-walled, whereby the weight of the overall device increases undesirably. In addition, the welds are in use of CO 2 as coolant as weak points in the system for pressure load and corrosion particularly critical. A minimization of the wall thickness is not possible in such welded constructions, since microstructural changes adversely affect the strength values and the corrosion resistance. In addition, the fixtures are exposed during welding a large thermal stress.
  • EP 1 564 510 A2 is already a collector of air conditioning systems known in which the housing is deformed by cold deformation at its open end so that a shoulder is formed with an opening. In the area of the opening, a thread is cut in the shoulder so that a bursting closure can be screwed in.
  • the present invention has for its object to provide a method for producing an improved device for collecting and drying a coolant in an air conditioner, which is easy and safe take place and in which as little material is consumed.
  • the non-cutting forming takes place in at least three steps, each with different forming tools.
  • a thread is also formed without cutting in the passage opening.
  • Fig. 1 is a cross-sectional view of an apparatus for collecting and drying a refrigerant produced in accordance with the invention in an air conditioning system for preferably motor vehicles.
  • the housing 3 of the device is substantially cartridge-shaped, with the side walls 4 converging to a tip of the cartridge.
  • the tip is formed in the example shown as a fully rounded shoulder 5.
  • a suitable metal or a metal alloy is usually used.
  • Preference is given to using a thick-walled aluminum part produced by the extrusion process, the use of AIMgSi1 in particular giving good results.
  • a wall thickness of approximately 4.9 ⁇ 0.2 mm was successfully tested.
  • other materials can be used, and the wall thickness depends on the required volume content in addition to the required bursting pressure.
  • the housing 3 has in its base plate 9 an input port 11 for supplying a coolant (not shown) and an output port 13 for discharging the coolant.
  • a coolant not shown
  • the device described here is particularly well suited for the use of CO 2 as a coolant, but all other conventional coolant can be used.
  • connection bores 15 provided there and fixed in a gas-tight manner.
  • a substantially U-shaped tube 17 is connected, which has a shorter leg 19 and a longer leg 21.
  • the longer leg 21 is directly connected to the output port 13 for discharging the coolant, wherein the U-shaped tube 17 extends substantially through the entire inner space 7 of the housing 3 and its apex 23 is disposed near the shoulder 5 of the housing 3.
  • the shorter leg 19 is preferably only slightly shorter than the longer leg 21 and extends close to an inner surface 25 of the base plate 9 of the housing 3 zoom. The exact distance from this is determined by the liquid content of the air conditioning circuit. In the liquid state of the coolant, the volume content of the collector must be so large that the container does not overflow.
  • a container 27 is mounted, which is filled with a desiccant 29.
  • the container 27 can either be attached directly to the tube 17 by means of a conventional fastening device, in the present case, however, it is designed as a gauze bag, which is clamped between the two legs 19 and 21 of the tube 17.
  • a desiccant 29 a commercial desiccant can be used, for example, the granules XH-7.
  • a filler pipe 31 is gas-tightly connected, which projects into the interior 7 of the housing 3.
  • a filter 39 is provided for filtering particles in the region of the apex 23 of the tube 17, and directly in the apex 23 of the tube 17, a ⁇ ölungsbohrung 41 is arranged, which receives an oil sump.
  • the oil is carried by the volume flow of the gaseous coolant and serves to lubricate the compressor.
  • the tube 17, the filler pipe 31, the filter 39 and the container 27 for the desiccant 29 are hereinafter also referred to as "built-in parts", since they must be already mounted before closing the interior 7 of the housing 3.
  • a passage opening 43 is formed, which has a shaped thread and into which a safety fitting 45 is screwed against overpressure. This serves to compensate for any sudden overpressure in the container 3 and is preferably designed as a rupture disk.
  • the entire device is substantially diffusion-tight to prevent leakage of the coolant.
  • the operation of the apparatus for collecting and drying a coolant will be described below.
  • the coolant enters the interior 7 of the housing 3 through the inlet port 11 and the filler pipe 31. With increasing filling of the interior 7, the coolant necessarily wets the desiccant 29 in the container 27. This moisture is removed from the coolant, which is chemically bonded in the granules 29. Subsequently, coolant is passed through the U-shaped tube 17 to the outlet port 13, from which it returns to the circulation of the air conditioner, the coolant additionally entrains small oil particles due to its flow from the oil sump in the oiling well 41, for automatic oiling provide the following components.
  • a housing base 47 which is shown at A, made of the material already described above, preferably by means of extrusion molding process.
  • the housing base 47 has the shape of a sleeve with side walls 4, a closed end 49 and an open end 51.
  • the closed End 49 is formed by the base plate 9.
  • connection bores 15 for input connection 11 and output connection 13 After the machining of the housing base element 47 for the formation of connection bores 15 for input connection 11 and output connection 13, the washing of all parts and the installation of the installation parts takes place inside the housing base element 47. For reasons of clarity, both the connection bores 15 and the input connection 11 in FIG. Output terminal 13 and all built-in parts omitted. However, it should be clear that in the entire forming process (B to E) in the interior 7 of the housing 3, the mounting parts are already pre-assembled and also the terminals 11, 13 are present in the connection holes 15.
  • the forming steps shown from B to E are carried out sequentially when the material is cold.
  • corresponding symmetrical molds 53 are placed and pressed onto the open end 49 of the sleeve-shaped housing base element 47, in which the mounting parts are mounted, so that the shape of a cartridge-shaped housing 3 develops successively.
  • the number of steps, four forming steps in the present example can be chosen freely, however, the bending stiffness of the material must be taken into account and attention paid to the preservation of the material structure of the side walls 4.
  • a compression occurs in the region of the shoulder 5 of the housing, which leads to a wall thickening of about 70% and at the same time an increase in strength of about 10%.
  • the remaining through opening 43 in the region of the shoulder 5 of the housing 3 is shaped to a size which corresponds to the core diameter of the thread to be introduced.
  • the wall thickening allows a sufficient thread length for the rupture disc holder to be screwed.
  • the entire device is turned upside down and it is chipless formed by means of conventional molding techniques, a thread in the passage opening 43, whereupon the threaded rupture disc holder is screwed together with the rupture disc 45.
  • This manufacturing method is less expensive than any welded construction, and in particular during assembly the fixtures are not subjected to thermal stress.
  • a device for collecting and drying a cooling liquid in an air conditioner is produced in a particularly simple manner, which is also particularly well suited for the use of CO 2 as a coolant and a high reliability and durability.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Gases (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Coating Apparatus (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

The device has a housing (3) exhibiting an input terminal (11) for supplying a refrigerant and an output terminal for discharging the refrigerant. The housing receives a u-shaped pipe, container, filling pipe and filter in its inner chamber (7), where the u-shaped pipe, container, filling pipe and filter are fixed at the housing. The housing has a passage opening (43) for receiving a safety armature (45) against high pressure, and is designed as a single piece. An independent claim is also included for a method for collecting and drying a refrigerant in an air conditioning system in a motor vehicle.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer Vorrichtung zum Sammeln und Trocknen eines Kühlmittels in einer Klimaanlage.The present invention relates to a method of manufacturing a device for collecting and drying a coolant in an air conditioner.

Bei üblichen Klimaanlagen, insbesondere für Kraftfahrzeuge, sind neben den Baugruppen Kompressor, Verflüssiger/Kondensator, Expansionsventil und Verdampfer kombinierte Sammler/Trockner im Einsatz, die zur Aufnahme des flüssigen Kühlmittels dienen. In diesen Sammlern wird das vom Verdampfer nicht komplett in Gas umgewandelte Kühlmittel gesammelt, damit keine Flüssigkeit zum Kompressor gelangt. Da die Menge des zirkulierenden Kühlmittels abhängig von der Wärmebelastung variiert, sind diese Sammler/Trockner unbedingt erforderlich. Üblicherweise werden darin außerdem beispielsweise mittels eines Siebs Fremdkörper entfernt, und der integrierte Trockner dient zur Absorption der Feuchtigkeit aus dem Kühlmittel. Dies ist notwendig, da z.B. beim Einbau Feuchtigkeit in die Anlage gelangt. Die hygroskopische Substanz des Trockners kann beispielsweise als Granulat ausgebildet sein, das das dem Kühlmittel entzogene Wasser chemisch bindet. Damit wird die Korrosionsgefahr ebenso wie die Vereisung des Expansionsventils verringert und der Verdichter vor Beschädigung geschützt.In conventional air conditioning systems, especially for motor vehicles, in addition to the modules compressor, condenser / condenser, expansion valve and evaporator combined collectors / dryers are in use, which serve to hold the liquid coolant. In these collectors, the refrigerant that has not been completely converted into gas by the evaporator is collected so that no liquid gets to the compressor. Since the amount of circulating coolant varies depending on the heat load, these collectors / dryers are essential. Usually, foreign matter is also removed therefrom, for example by means of a sieve, and the integrated dryer serves to absorb the moisture from the coolant. This is necessary because e.g. Moisture gets into the system during installation. The hygroscopic substance of the dryer can be formed, for example, as granules, which chemically binds the water removed from the coolant. This reduces the risk of corrosion as well as the icing of the expansion valve and protects the compressor from damage.

Die heute auf dem Markt befindlichen Klimaanlagen für Kraftfahrzeuge verwenden üblicherweise das Kühlmittel R134a. Die hierfür verwendeten Vorrichtungen zum Sammeln und Trocknen des Kühlmittels werden aus Edelstahl bzw. Aluminiumlegierungen aus einem Gehäuse und einem Deckel hergestellt. Das Gehäuse und der Deckel werden nach der Montage der Einbauteile, d.h. des Filters, integrierter Rohrleitungen, des Behälters für das Trockenmittel etc., miteinander verschweißt.Automotive air conditioning systems currently on the market typically use R134a refrigerant. The devices used for collecting and drying the coolant are made of stainless steel or aluminum alloys from a housing and a lid. The housing and the lid are replaced after assembly of the fixtures, i. of the filter, integrated piping, desiccant container, etc. are welded together.

In jüngerer Zeit werden bereits zu Testzwecken und in kleinen Serien CO2-Klimaanlagen für Kraftfahrzeuge hergestellt. Derartige Systeme benötigen zur Funktionsfähigkeit einen sehr hohen Druck im Verhältnis zum derzeit eingesetzten Kühlmittel R134a. Somit werden an die Bauteile des Systems sehr hohe Anforderungen hinsichtlich des Berstverhaltens gestellt. Aufgrund des erhöhten Drucks müssen die Gehäuse der Sammler/Trockner, die nach dem üblichen Verfahren hergestellt werden, besonders dickwandig sein, wobei das Gewicht der Gesamtvorrichtung unerwünscht steigt. Außerdem sind die Schweißnähte bei Verwendung von CO2 als Kühlmittel als Schwachstellen im System für Druckbelastung und Korrosion besonders kritisch. Eine Minimierung der Wandstärke ist bei derartigen verschweißten Konstruktionen nicht möglich, da durch Gefügeänderungen die Festigkeitswerte und die Korrosionsbeständigkeit negativ beeinflusst werden. Außerdem werden die Einbauteile beim Schweißen einer großen thermischen Belastung ausgesetzt.More recently, CO 2 air conditioning systems for motor vehicles have already been produced for test purposes and in small series. Such systems require a very high pressure to function in relation to the currently used refrigerant R134a. Thus, very high demands are made on the components of the system with regard to the bursting behavior. Due to the increased pressure, the housings of the collectors / dryers, which are produced by the usual method, must be particularly thick-walled, whereby the weight of the overall device increases undesirably. In addition, the welds are in use of CO 2 as coolant as weak points in the system for pressure load and corrosion particularly critical. A minimization of the wall thickness is not possible in such welded constructions, since microstructural changes adversely affect the strength values and the corrosion resistance. In addition, the fixtures are exposed during welding a large thermal stress.

Aus der EP 1 564 510 A2 ist bereits ein Sammler für Klimaanlagen bekannt, bei dem das Gehäuse mittels Kaltverformung an seinem offenen Ende so verformt wird, dass eine Schulter mit einer Öffnung entsteht. Im Bereich der Öffnung wird ein Gewinde in die Schulter geschnitten, damit ein Berstverschluss eingeschraubt werden kann.From the EP 1 564 510 A2 is already a collector of air conditioning systems known in which the housing is deformed by cold deformation at its open end so that a shoulder is formed with an opening. In the area of the opening, a thread is cut in the shoulder so that a bursting closure can be screwed in.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung einer verbesserten Vorrichtung zum Sammeln und Trocknen eines Kühlmittels in einer Klimaanlage anzugeben, das einfach und sicher vonstatten geht und bei dem möglichst wenig Material verbraucht wird.The present invention has for its object to provide a method for producing an improved device for collecting and drying a coolant in an air conditioner, which is easy and safe take place and in which as little material is consumed.

Diese Aufgabe wird durch das Verfahren gemäß Anspruch 1 gelöst.This object is achieved by the method according to claim 1.

Das erfindungsgemäße Verfahren zur Herstellung einer Vorrichtung zum Sammeln und Trocknen eines Kühlmittels in einer Klimaanlage weist folgende Schritte auf: Ausbilden eines Gehäusegrundelements aus Metall in Form einer Hülse mit Seitenwänden, einem geschlossenen Ende und einem offenen Ende und Ausbilden eines Eingangsanschlusses zum Zuführen des Kühlmittels und eines Ausgangsanschlusses zur Abgabe des Kühlmittels im Gehäusegrundelement; Befestigen einer Mehrzahl von Einbauteilen im Inneren des Gehäusegrundelements; und mehrfaches spanloses Umformen der Seitenwände des hülsenförmigen Grundelements am offenen Ende zu einer Schulter zum Ausbilden eines einstückigen Gehäuses mit einer Durchtrittsöffnung für eine Sicherheitsarmatur gegen Überdruck. Um die Umformung Material schonend durchzuführen, findet das spanlose Umformen in wenigstens drei Schritten mit jeweils verschiedenen Formwerkzeugen statt. Um das Eindringen von Spänen in das Innere der Vorrichtung zum Sammeln und Trocknen eines Kühlmittels vollständig auszuschließen, wird außerdem ein Gewinde in die Durchtrittsöffnung spanlos geformt.The method according to the invention for producing a device for collecting and drying a coolant in an air conditioning system comprises the steps of: forming a metal housing base in the form of a sleeve having sidewalls, a closed end and an open end, and forming an inlet port for supplying the coolant and a coolant Output terminal for discharging the coolant in the housing base member; Attaching a plurality of mounting parts inside the housing base member; and multiple non-cutting forming the side walls of the sleeve-shaped base member at the open end to a shoulder for forming a one-piece housing with a passage opening for a safety valve against over-pressure. In order to perform the forming material gently, the non-cutting forming takes place in at least three steps, each with different forming tools. In order to completely exclude the penetration of chips into the interior of the device for collecting and drying a coolant, a thread is also formed without cutting in the passage opening.

Dieses Verfahren ist besonders einfach, spart Material ein und umgeht die Notwendigkeit eines Schweißvorgangs, so dass insgesamt eine leichtgewichtige Vorrichtung zum Sammeln und Trocknen eines Kühlmittels hergestellt wird, die zudem sicher ist und lange Zeit funktionsfähig ist. Gleichzeitig findet durch den Umformungsprozess eine Stauchung des Materials am offenen Ende des hülsenförmigen Grundelements statt, die zu einer Wandverdickung und gleichzeitig einer Festigkeitszunahme führt.This process is particularly simple, saves material and bypasses the need a welding operation, so that a total of a lightweight device for collecting and drying a coolant is produced, which is also safe and long-term functioning. At the same time takes place by the deformation process, a compression of the material at the open end of the sleeve-shaped base element, which leads to a wall thickening and at the same time an increase in strength.

Bevorzugte Ausführungsformen sind in den Unteransprüchen angegeben.Preferred embodiments are specified in the subclaims.

Weitere Einzelheiten, Merkmale und Vorteile der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung unter Bezugnahme auf die Zeichnungen.

Fig. 1
zeigt einen Querschnitt durch eine beispielhafte Ausführungsform einer Vorrichtung zum Sammeln und Trocknen eines Kühlmittels in einer Klimaanlage, hergestellt gemäß der vorliegenden Erfindung; und
Fig. 2
zeigt eine schematische Querschnittsdarstellung der erfindungsgemäßen Umformungsschritte des Gehäusegrundelements zur Bildung einer Schulter mit der Öffnung sowie der dafür verwendeten Formwerkzeuge.
Further details, features and advantages of the present invention will become apparent from the following description with reference to the drawings.
Fig. 1
shows a cross-section through an exemplary embodiment of a device for collecting and drying a coolant in an air conditioner manufactured according to the present invention; and
Fig. 2
shows a schematic cross-sectional view of the forming steps according to the invention of the housing base member to form a shoulder with the opening and the molds used therefor.

Fig. 1 ist eine Querschnittsansicht einer erfindungsgemäß hergestellten Vorrichtung zum Sammeln und Trocknen eines Kühlmittels in einer Klimaanlage für vorzugsweise Kraftfahrzeuge. Das Gehäuse 3 der Vorrichtung ist im wesentlichen patronenförmig ausgebildet, wobei die Seitenwände 4 zu einer Spitze der Patrone zusammenlaufen. Die Spitze ist im dargestellten Beispielsfall als vollständig abgerundete Schulter 5 ausgebildet. Als Material des Gehäuses 3 wird üblicherweise ein geeignetes Metall oder eine Metalllegierung verwendet. Bevorzugt kann ein im Fließpressverfahren hergestelltes, dickwandiges Aluminiumteil verwendet werden, wobei insbesondere der Einsatz von AIMgSi1 gute Ergebnisse lieferte. Hierbei wurde bei einem Volumeninhalt im Innenraum 7 des Gehäuses 3 von 600 ml und einem Außendurchmesser von 75 mm eine Wandstärke von ca. 4,9 ± 0.2 mm erfolgreich getestet. Selbstverständlich können aber auch andere Materialien eingesetzt werden, und die Wandstärke hängt neben dem notwendigen Volumeninhalt vom erforderlichen Berstdruck ab.Fig. 1 is a cross-sectional view of an apparatus for collecting and drying a refrigerant produced in accordance with the invention in an air conditioning system for preferably motor vehicles. The housing 3 of the device is substantially cartridge-shaped, with the side walls 4 converging to a tip of the cartridge. The tip is formed in the example shown as a fully rounded shoulder 5. As a material of the housing 3, a suitable metal or a metal alloy is usually used. Preference is given to using a thick-walled aluminum part produced by the extrusion process, the use of AIMgSi1 in particular giving good results. Here, with a volume content in the interior 7 of the housing 3 of 600 ml and an outer diameter of 75 mm, a wall thickness of approximately 4.9 ± 0.2 mm was successfully tested. Of course, other materials can be used, and the wall thickness depends on the required volume content in addition to the required bursting pressure.

Das Gehäuse 3 weist in seiner Grundplatte 9 einen Eingangsanschluss 11 zum Zuführen eines Kühlmittels (nicht dargestellt) und einen Ausgangsanschluss 13 zur Abgabe des Kühlmittels auf. Die hier beschriebene Vorrichtung ist insbesondere für den Einsatz von CO2 als Kühlmittel hervorragend geeignet, allerdings können auch alle anderen konventionellen Kühlmittel verwendet werden.The housing 3 has in its base plate 9 an input port 11 for supplying a coolant (not shown) and an output port 13 for discharging the coolant. The device described here is particularly well suited for the use of CO 2 as a coolant, but all other conventional coolant can be used.

Der Eingangsanschluss 11 und der Ausgangsanschluss 13 in der Grundplatte 9 des Gehäuses 3 sind in dort vorgesehenen Anschlussbohrungen 15 eingebracht und auf gasdichte Weise befestigt.The input terminal 11 and the output terminal 13 in the base plate 9 of the housing 3 are inserted into connection bores 15 provided there and fixed in a gas-tight manner.

Mit dem Ausgangsanschluss 13 ist ein im wesentlichen U-förmiges Rohr 17 verbunden, das einen kürzeren Schenkel 19 und einen längeren Schenkel 21 aufweist. Der längere Schenkel 21 ist unmittelbar mit dem Ausgangsanschluss 13 zur Abgabe des Kühlmittels verbunden, wobei sich das U-förmige Rohr 17 im wesentlichen durch den gesamten Innenraum 7 des Gehäuses 3 erstreckt und sein Scheitel 23 nahe der Schulter 5 des Gehäuses 3 angeordnet ist. Der kürzere Schenkel 19 ist vorzugsweise nur geringfügig kürzer als der längere Schenkel 21 und erstreckt sich bis nahe an eine Innenfläche 25 der Grundplatte 9 des Gehäuses 3 heran. Der genaue Abstand hiervon wird durch den Flüssigkeitsinhalt des Klimakreislaufes festgelegt. Im flüssigen Zustand des Kühlmittels muss der Volumeninhalt des Sammlers so groß sein, dass der Behälter nicht überläuft.With the output terminal 13, a substantially U-shaped tube 17 is connected, which has a shorter leg 19 and a longer leg 21. The longer leg 21 is directly connected to the output port 13 for discharging the coolant, wherein the U-shaped tube 17 extends substantially through the entire inner space 7 of the housing 3 and its apex 23 is disposed near the shoulder 5 of the housing 3. The shorter leg 19 is preferably only slightly shorter than the longer leg 21 and extends close to an inner surface 25 of the base plate 9 of the housing 3 zoom. The exact distance from this is determined by the liquid content of the air conditioning circuit. In the liquid state of the coolant, the volume content of the collector must be so large that the container does not overflow.

Zwischen den beiden Schenkeln 19 und 21 des U-förmigen Rohrs 17 ist ein Behälter 27 angebracht, der mit einem Trockenmittel 29 gefüllt ist. Der Behälter 27 kann entweder unmittelbar am Rohr 17 mittels einer üblichen Befestigungsvorrichtung befestigt sein, im vorliegenden Fall ist er jedoch als Gazebeutel ausgebildet, der zwischen die beiden Schenkel 19 und 21 des Rohrs 17 eingeklemmt ist. Als Trockenmittel 29 kann ein handelsübliches Trockenmittel verwendet werden, beispielsweise das Granulat XH-7.Between the two legs 19 and 21 of the U-shaped tube 17, a container 27 is mounted, which is filled with a desiccant 29. The container 27 can either be attached directly to the tube 17 by means of a conventional fastening device, in the present case, however, it is designed as a gauze bag, which is clamped between the two legs 19 and 21 of the tube 17. As a desiccant 29, a commercial desiccant can be used, for example, the granules XH-7.

Mit dem Eingangsanschluss ist ein Einfüllrohr 31 gasdicht verbunden, das in den Innenraum 7 des Gehäuses 3 vorsteht. Außerdem ist im Bereich des Scheitels 23 des Rohrs 17 ein Filter 39 zum Ausfiltern von Partikeln vorgesehen, und unmittelbar im Scheitel 23 des Rohrs 17 ist eine Beölungsbohrung 41 angeordnet, die einen Ölsumpf aufnimmt. Das Öl wird durch den Volumenstrom des gasförmigen Kühlmittels mitgeführt und dient der Schmierung des Kompressors.To the input terminal, a filler pipe 31 is gas-tightly connected, which projects into the interior 7 of the housing 3. In addition, a filter 39 is provided for filtering particles in the region of the apex 23 of the tube 17, and directly in the apex 23 of the tube 17, a Öölungsbohrung 41 is arranged, which receives an oil sump. The oil is carried by the volume flow of the gaseous coolant and serves to lubricate the compressor.

Das Rohr 17, das Einfüllrohr 31, der Filter 39 sowie der Behälter 27 für das Trockenmittel 29 werden im Folgenden auch als "Einbauteile" bezeichnet, da sie vor dem Verschließen des Innenraums 7 des Gehäuses 3 bereits montiert sein müssen.The tube 17, the filler pipe 31, the filter 39 and the container 27 for the desiccant 29 are hereinafter also referred to as "built-in parts", since they must be already mounted before closing the interior 7 of the housing 3.

Im Bereich der Schulter 5 des Gehäuses 3 ist eine Durchtrittsöffnung 43 ausgebildet, die ein geformtes Gewinde aufweist und in die eine Sicherheitsarmatur 45 gegen Überdruck eingeschraubt, ist. Diese dient zum Ausgleich eines möglicherweise plötzlich entstehenden Überdrucks im Behälter 3 und ist vorzugsweise als Berstscheibe ausgebildet. Im Übrigen ist die gesamte Vorrichtung im wesentlichen diffusionsdicht, um ein Austreten des Kühlmittels zu verhindern.In the region of the shoulder 5 of the housing 3, a passage opening 43 is formed, which has a shaped thread and into which a safety fitting 45 is screwed against overpressure. This serves to compensate for any sudden overpressure in the container 3 and is preferably designed as a rupture disk. Incidentally, the entire device is substantially diffusion-tight to prevent leakage of the coolant.

Im Folgenden wird die Funktionsweise der Vorrichtung zum Sammeln und Trocknen eines Kühlmittels beschrieben. Das Kühlmittel tritt durch den Eingangsanschluss 11 und das Einfüllrohr 31 in den Innenraum 7 des Gehäuses 3 ein. Mit zunehmender Füllung des Innenraums 7 benetzt das Kühlmittel notwendigerweise das Trockenmittel 29 im Behälter 27. Dadurch wird dem Kühlmittel Feuchtigkeit entzogen, die in dem Granulat 29 chemisch gebunden wird. Anschließend wird Kühlmittel durch das U-förmige Rohr 17 zum Ausgangsanschluss 13 geleitet, von dem es wieder in den Kreislauf der Klimaanlage gelangt, wobei das Kühlmittel aufgrund seiner Strömung aus dem Ölsumpf in der Beölungsbohrung 41 zusätzlich kleine Ölpartikel mitnimmt, die für eine automatische Ölung der nachfolgenden Komponenten sorgen.The operation of the apparatus for collecting and drying a coolant will be described below. The coolant enters the interior 7 of the housing 3 through the inlet port 11 and the filler pipe 31. With increasing filling of the interior 7, the coolant necessarily wets the desiccant 29 in the container 27. This moisture is removed from the coolant, which is chemically bonded in the granules 29. Subsequently, coolant is passed through the U-shaped tube 17 to the outlet port 13, from which it returns to the circulation of the air conditioner, the coolant additionally entrains small oil particles due to its flow from the oil sump in the oiling well 41, for automatic oiling provide the following components.

Im Falle eines plötzlich auftretenden Überdrucks im Innenraum 7 wird die Berstscheibe 45 bersten und somit schlimmere Auswirkungen auf den gesamten Kreislauf verhindern.In the event of a sudden overpressure in the interior 7, the rupture disk 45 will burst and thus prevent worse effects on the entire circuit.

Natürlich können auch andere Anordnungen der Einbauteile im Innenraum 7 des Gehäuses 3 vorgenommen werden, die im Rahmen des Fachwissens eines Fachmanns liegen. Dies trifft auch für alle Befestigungsvorrichtungen und die Verbindung der einzelnen Elemente miteinander zu.Of course, other arrangements of the mounting parts in the interior 7 of the housing 3 can be made, which are within the skill of one of ordinary skill in the art. This also applies to all fastening devices and the connection of the individual elements together.

Unter Bezugnahme auf Fig. 2 wird nun der erfindungsgemäße Herstellungsprozess der Vorrichtung beispielhaft erläutert. Zunächst wird ein Gehäusegrundelement 47, das bei A dargestellt ist, aus dem bereits oben beschriebenen Material, vorzugsweise mittels Fließpressverfahren, hergestellt. Das Gehäusegrundelement 47 besitzt die Form einer Hülse mit Seitenwänden 4, einem geschlossenen Ende 49 und einem offenen Ende 51. Das geschlossene Ende 49 wird durch die Grundplatte 9 gebildet.With reference to FIG. 2, the manufacturing process of the device according to the invention will now be explained by way of example. First, a housing base 47, which is shown at A, made of the material already described above, preferably by means of extrusion molding process. The housing base 47 has the shape of a sleeve with side walls 4, a closed end 49 and an open end 51. The closed End 49 is formed by the base plate 9.

Nach der Bearbeitung des Gehäusegrundelements 47 zum Ausbilden von Anschlussbohrungen 15 für Eingangsanschluss 11 und Ausgangsanschluss 13 erfolgt das Waschen aller Teile und die Montage der Einbauteile im Inneren des Gehäusegrundelements 47. Aus Gründen der Übersichtlichkeit wurden in Fig. 2 sowohl die Anschlussbohrungen 15 sowie Eingangsanschluss 11, Ausgangsanschluss 13 und sämtliche Einbauteile weggelassen. Es soll jedoch klar sein, dass beim gesamten Umformungsprozess (B bis E) im Innenraum 7 des Gehäuses 3 die Einbauteile bereits vormontiert sind und auch die Anschlüsse 11, 13 in den Anschlussbohrungen 15 vorhanden sind.After the machining of the housing base element 47 for the formation of connection bores 15 for input connection 11 and output connection 13, the washing of all parts and the installation of the installation parts takes place inside the housing base element 47. For reasons of clarity, both the connection bores 15 and the input connection 11 in FIG. Output terminal 13 and all built-in parts omitted. However, it should be clear that in the entire forming process (B to E) in the interior 7 of the housing 3, the mounting parts are already pre-assembled and also the terminals 11, 13 are present in the connection holes 15.

Die von B bis E dargestellten Umformungsschritte werden aufeinander folgend bei kaltem Zustand des Materials durchgeführt. Hierzu werden entsprechende symmetrische Formwerkzeuge 53 auf das offene Ende 49 des hülsenförmigen Gehäusegrundelements 47, in dem die Einbauteile montiert sind, aufgesetzt und aufgepresst, so dass sich sukzessive die Form eines patronenförmigen Gehäuses 3 entwickelt. Die Anzahl der Schritte, im vorliegenden Beispielsfall vier Umformungsschritte, kann frei gewählt werden, allerdings muss hierbei die Biegesteifigkeit des Materials berücksichtigt und auf den Erhalt der Materialstruktur der Seitenwände 4 geachtet werden.The forming steps shown from B to E are carried out sequentially when the material is cold. For this purpose, corresponding symmetrical molds 53 are placed and pressed onto the open end 49 of the sleeve-shaped housing base element 47, in which the mounting parts are mounted, so that the shape of a cartridge-shaped housing 3 develops successively. The number of steps, four forming steps in the present example, can be chosen freely, however, the bending stiffness of the material must be taken into account and attention paid to the preservation of the material structure of the side walls 4.

Bei den hier dargestellten beispielhaften Umformungsprozessen entsteht gleichzeitig im Bereich der Schulter 5 des Gehäuses eine Stauchung, die zu einer Wandverdickung von ca. 70 % und gleichzeitig einer Festigkeitszunahme von ca. 10 % führt. Mit dem bei Schritt E dargestellten Formwerkzeug 53 wird schließlich die verbleibende Durchtrittsöffnung 43 im Bereich der Schulter 5 des Gehäuses 3 auf eine Größe geformt, die dem Kerndurchmesser des einzubringenden Gewindes entspricht. Außerdem erlaubt die Wandverdickung eine ausreichende Gewindelänge für den einzuschraubenden Berstscheibenhalter.In the exemplary forming processes illustrated here, a compression occurs in the region of the shoulder 5 of the housing, which leads to a wall thickening of about 70% and at the same time an increase in strength of about 10%. Finally, with the forming tool 53 shown in step E, the remaining through opening 43 in the region of the shoulder 5 of the housing 3 is shaped to a size which corresponds to the core diameter of the thread to be introduced. In addition, the wall thickening allows a sufficient thread length for the rupture disc holder to be screwed.

Abschließend wird die gesamte Vorrichtung auf den Kopf gestellt und es wird spanlos mittels üblicher Formtechniken ein Gewinde in die Durchtrittsöffnung 43 geformt, woraufhin der mit dem Gewinde versehene Berstscheibenhalter zusammen mit der Berstscheibe 45 eingeschraubt wird.Finally, the entire device is turned upside down and it is chipless formed by means of conventional molding techniques, a thread in the passage opening 43, whereupon the threaded rupture disc holder is screwed together with the rupture disc 45.

Dieses Herstellungsverfahren ist kostengünstiger als jede Schweißkonstruktion, und insbesondere werden bei der Montage die Einbauteile keiner thermischen Belastung ausgesetzt.This manufacturing method is less expensive than any welded construction, and in particular during assembly the fixtures are not subjected to thermal stress.

Somit wird auf besonders einfache Weise eine Vorrichtung zum Sammeln und Trocknen einer Kühlflüssigkeit in einer Klimaanlage hergestellt, die auch besonders gut geeignet ist für einen Einsatz von CO2 als Kühlmittel und eine große Funktionssicherheit sowie Beständigkeit bietet.Thus, a device for collecting and drying a cooling liquid in an air conditioner is produced in a particularly simple manner, which is also particularly well suited for the use of CO 2 as a coolant and a high reliability and durability.

Claims (7)

  1. Method for manufacturing a device for collecting and drying a coolant in an air conditioner having the following steps:
    - forming a housing base element (47) from metal in the form of a sleeve having side walls (4), a closed end (49) and an open end (51), and forming an inlet connection (11) for delivery of the coolant and an outlet connection (13) for discharge of the coolant in the housing base element (47) ;
    - fixing a plurality of fittings (17, 27, 31, 39) inside the housing base element (47),
    - shaping the side walls (4) of the sleeve-like housing base element (47) at the open end (51) into a shoulder (5) without cutting, to form a one-piece housing (3) having a through-opening (43) for a safety fitting (45) to protect against excess pressure, and
    - forming an internal thread in the shoulder (5) of the housing (5) in the region of the through-opening (43),
    characterised in that
    - shaping the side walls (4) of the sleeve-like housing base element (47) at the open end (51) into a shoulder (5) without cutting is carried out in at least three steps with different shaping tools in each case, and
    - forming the internal thread in the shoulder (5) of the housing (3) in the region of the through-opening (43) takes place by shaping without cutting.
  2. Method for manufacturing a device for collecting and drying a coolant in an air conditioner according to claim 1, characterised in that shaping the side walls (4) of the sleeve-like housing base element (47) at the open end (51) into a shoulder (5) without cutting is carried out in four steps with different shaping tools (53) in each case.
  3. Method for manufacturing a device for collecting and drying a coolant in an air conditioner according to claim 1 or 2, characterised by screwing the safety fitting (45) into the through-opening (43).
  4. Method for manufacturing a device for collecting and drying a coolant in an air conditioner according to any of the preceding claims, wherein, when shaping the side walls (4) of the sleeve-like housing base element (47) at the open end (51) into a shoulder (5) without cutting in at least three steps, the different shaping tools are placed and pressed onto the open end (49) of the sleeve-like housing base element (47), so that the shape of a cartridge-like housing (3) develops successively.
  5. Method for manufacturing a device for collecting and drying a coolant in an air conditioner according to any of the preceding claims, wherein, when shaping the internal thread in the shoulder (5) of the housing (3) in the region of the through-opening (43) without cutting, the device is turned upside down so that the through-opening is directed downwards.
  6. Method for manufacturing a device for collecting and drying a coolant in an air conditioner according to any of the preceding claims, wherein shaping the side walls (4) of the sleeve-like housing base element (47) at the open end (51) without cutting in at least three steps forms a shoulder (5) with uniform upset deformation which is about 70% thicker than the side walls (4).
  7. Method for manufacturing a device for collecting and drying a coolant in an air conditioner according to any of the preceding claims, wherein the housing base element (47) is an aluminium part made by extrusion with a side wall thickness of approximately 4.9 ± 0.2 mm.
EP05022246A 2005-10-12 2005-10-12 Method for producing a device for collecting and drying a refrigerant in an air conditioning unit Not-in-force EP1775530B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP05022246A EP1775530B1 (en) 2005-10-12 2005-10-12 Method for producing a device for collecting and drying a refrigerant in an air conditioning unit
AT05022246T ATE380990T1 (en) 2005-10-12 2005-10-12 METHOD FOR PRODUCING A DEVICE FOR COLLECTING AND DRYING A REFRIGERANT IN AN AIR CONDITIONING SYSTEM
DE502005002246T DE502005002246D1 (en) 2005-10-12 2005-10-12 Method for producing a device for collecting and drying a coolant in an air conditioning system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05022246A EP1775530B1 (en) 2005-10-12 2005-10-12 Method for producing a device for collecting and drying a refrigerant in an air conditioning unit

Publications (2)

Publication Number Publication Date
EP1775530A1 EP1775530A1 (en) 2007-04-18
EP1775530B1 true EP1775530B1 (en) 2007-12-12

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EP05022246A Not-in-force EP1775530B1 (en) 2005-10-12 2005-10-12 Method for producing a device for collecting and drying a refrigerant in an air conditioning unit

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EP (1) EP1775530B1 (en)
AT (1) ATE380990T1 (en)
DE (1) DE502005002246D1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007033149A1 (en) * 2007-07-13 2009-01-15 Behr Gmbh & Co. Kg Accumulator, in particular for an air conditioning system, with dirt trap
DE102015203601A1 (en) * 2015-02-27 2016-09-01 Mahle International Gmbh dryer
CN108870813B (en) * 2018-08-31 2024-04-12 上海银轮热交换系统有限公司 Gas-liquid separator

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675971A (en) * 1985-12-03 1987-06-30 Michigan Special Products, Inc. Desiccant assembly for refrigeration circuit and method
US5906112A (en) * 1997-12-12 1999-05-25 Ford Motor Company Accumulator for an air conditioning system
US20050081559A1 (en) * 2003-10-20 2005-04-21 Mcgregor Ian A.N. Accumulator with pickup tube
US7287399B2 (en) * 2004-02-17 2007-10-30 Obrist Engineering Gmbh Collector for the liquid phase of the working medium of an air-conditioning system

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EP1775530A1 (en) 2007-04-18
ATE380990T1 (en) 2007-12-15
DE502005002246D1 (en) 2008-01-24

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