EP0337227A2 - Method of making a displacer for the cold finger of a cryogenic refrigerator and displacer made according to this method - Google Patents

Method of making a displacer for the cold finger of a cryogenic refrigerator and displacer made according to this method Download PDF

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Publication number
EP0337227A2
EP0337227A2 EP89105776A EP89105776A EP0337227A2 EP 0337227 A2 EP0337227 A2 EP 0337227A2 EP 89105776 A EP89105776 A EP 89105776A EP 89105776 A EP89105776 A EP 89105776A EP 0337227 A2 EP0337227 A2 EP 0337227A2
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EP
European Patent Office
Prior art keywords
displacer
injected
bottom part
housing part
making
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Granted
Application number
EP89105776A
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German (de)
French (fr)
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EP0337227B1 (en
EP0337227A3 (en
Inventor
Wilhelm Strasser
Axel Veit
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Balzers und Leybold Deutschland Holding AG
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Leybold AG
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Priority to AT89105776T priority Critical patent/ATE87083T1/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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames

Definitions

  • the invention relates to a method for producing a plastic displacer for the cold head of a cryo-refrigerator and to a displacer produced by this method.
  • Refrigerators are low-temperature chillers in which thermodynamic cycles (Stirling, Gifford-Mac Mahon or the like) take place.
  • a single-stage refrigerator includes a work space with a displacer. The working space is connected in a certain way alternately with a high-pressure and a low-pressure gas source, so that the thermodynamic cycle takes place during the forced back and forth movement of the displacer. The working gas is conducted in a closed cycle. The result is that heat is extracted from a certain area of the work area. With two-stage refrigerators of this type and helium as the working gas, temperatures below 10 K can be generated.
  • a displacer which usually houses a regenerator (two-way heat exchanger) inside, must have the following properties: Its strength, especially at the low temperatures that occur, its sliding properties and its aging resistance must be good. It must be a poor heat conductor so that the heat exchange between its cold and warm ends remains small. Be coefficient of thermal expansion and its specific heat capacity must be low. He must also have a low water absorption (hygroscopy).
  • the present invention has for its object to provide a method for producing a displacer made of plastic and a displacer manufactured according to it, in which these disadvantages no longer exist.
  • this object is achieved in that the parts forming the displacer are produced from a thermoplastic by injection molding.
  • High-molecular low-pressure polyethylene is preferably used as the thermoplastic.
  • polyamides and imides is also possible. Machining steps are almost completely eliminated in the manufacture of displacers. The risk of excessive moisture absorption no longer exists, so that both the costly drying processes and the storage of finished displacers under protective gas can still be dispensed with.
  • lip seals, sliding or supporting elements, elements for snap locks and snap connection joints can be molded on during the manufacturing step according to the invention.
  • Reinforcing elements which are intended to prevent the material from shrinking, in particular in the areas of the seals, can also be integrated during the production process.
  • Figure 1 shows a displacer 1 produced by the method according to the invention with a cavity 2, which receives the regenerator, not shown.
  • the essentially cylindrical displacer, the axis of which is designated 3 consists essentially of two parts, namely a housing part 4 and a base part 5.
  • the drive piston 6 is injection molded onto the housing part 4.
  • the bores 7 and 8 in the housing part 4 and 11, 12 in the base part 5 can also be produced simultaneously with the spraying process. A special processing step is not necessary.
  • FIG. 1 shows two differently designed sealing systems 13 and 14.
  • the sealing system 13 comprises - as is often known - a plastic sealing ring 15 with an O-ring 16 underneath it.
  • the ring 15 can also be produced by injection molding.
  • the outer groove 17 on the displacer housing 4 was also created during the injection molding process.
  • the sealing system 14 comprises a circumferential lip 18, which is also assigned a circumferential recess 19 in the displacer housing 4. Lip 18 and recess 19 can also arise simultaneously with the spraying process.
  • the base 5 is held in the housing part 4 by means of a snap lock 21.
  • axially extending latching sections 22 and 23 are provided on the bottom part 5 and on the housing part 4, which extend axially and can be circumferential or section-wise.
  • the inner locking section 23 is equipped with an inner reinforcing ring 14, which, for. B. consists of stainless steel. This ring 24 prevents inward movement of the locking section 23, which could occur as a result of material shrinkage.
  • a stump 25 is also molded onto the base part 5 and serves to hold a further displacer 26 of a second refrigerator stage.
  • the stump 25 is equipped with a spherically shaped projection 27.
  • This circumferential ring 27 engages in a corresponding groove 28 of an extension 29 in the form of a tubular section on the displacer 26. This creates a snap connection joint which permits a limited pivoting movement of the displacer 26.
  • FIG. 2 shows a variant of the joint according to FIG. 1.
  • a spherical shell-shaped section 30 a is provided which engages in a corresponding recess 30 b on the second step 26. Segments 30 c securely encompass section 30a.
  • the bottom 5 is screwed to the housing 4.
  • the bottom 5 carries an axially extending through the housing 4 mandrel 31, the extension of which is the drive piston 6.
  • the mandrel 31 serves to hold a regenerator, which is created by winding a fabric tape around the mandrel.
  • the inflow opening 32 for the working gas is circular.
  • the inside of the outer housing part 14 is at the level of the sealing system 13 with a reinforcing ring 33 - again preferably made of stainless steel.
  • the reinforcing ring 33 serves to prevent the material from shrinking. A shrinking of the material in the Area of sealing systems could result in a loss of sealing force.
  • the end of the housing part 4 facing the bottom 5 is equipped with lip sections 34, 35, several of which are arranged evenly distributed over the circumference.
  • a recess 36 or 37 is assigned to each lip section 34 or 35.
  • Figure 4 shows a plan view of the lip portion 35 with its recess 37. Lip portions of this type form a type of skid with a support function.
  • the advantage associated with the described embodiments is essentially that the displacers shown can be produced in a simple manner by spraying.
  • the reinforcement rings 24, 33 can also be injected or injected.
  • the grooves 17, the light lips 18, 34, 35, the latching sections 21, 23 and the snap joint 27 to 29 can also be formed during the spraying process.

Abstract

The invention relates to a method of making a plastic displacer (1) for the cold finger of a cryogenic refrigerator. In order to simplify the manufacture of the displacer and improve its hygroscopic properties, it is proposed to make the parts (4, 5) forming the displacer from a thermoplastic by injection moulding. <IMAGE>

Description

Die Erfindung bezieht sich auf ein Verfahren zur Herstellung eines aus Kunststoff bestehenden Verdrängers für Kaltkopf eines Kryo-Refrigerators sowie auf einen nach diesem Verfahren hergestellten Verdränger.The invention relates to a method for producing a plastic displacer for the cold head of a cryo-refrigerator and to a displacer produced by this method.

Refrigeratoren sind Tieftemperatur-Kältemaschinen, in denen thermodynamische Kreisprozesse (Stirling, Gifford-Mac Mahon oder dergleichen) ablaufen. Ein einstufiger Refrigerator umfaßt einen Arbeitsraum mit einem Verdränger. Der Arbeitsraum wird in be­stimmter Weise alternierend mit einer Hochdruck- und einer Niederdruck-Gasquelle verbunden, so daß während der erzwungenen Hin- und Herbewegung des Verdrängers der thermodynamische Kreis­prozeß abläuft. Dabei wird das Arbeitsgas in einem geschlossenen Kreislauf geführt. Die Folge ist, daß einem bestimmten Bereich des Arbeitsraumes Wärme entzogen wird. Mit zweistufigen Refrige­ratoren dieser Art und Helium als Arbeitsgas lassen sich Tempe­raturen bis unter 10 K erzeugen.Refrigerators are low-temperature chillers in which thermodynamic cycles (Stirling, Gifford-Mac Mahon or the like) take place. A single-stage refrigerator includes a work space with a displacer. The working space is connected in a certain way alternately with a high-pressure and a low-pressure gas source, so that the thermodynamic cycle takes place during the forced back and forth movement of the displacer. The working gas is conducted in a closed cycle. The result is that heat is extracted from a certain area of the work area. With two-stage refrigerators of this type and helium as the working gas, temperatures below 10 K can be generated.

Ein Verdränger, der üblicherweise in seinem Inneren einen Rege­nerator (Zweiweg-Wärmetauscher) aufnimmt, muß folgende Eigen­schaften haben: Seine Festigkeit, insbesondere bei den auftre­tenden tiefen Temperaturen, seine Gleiteigenschaften und seine Alterungsbeständigkeit müssen gut sein. Er muß ein schlechter Wärmeleiter sein, damit der Wärmeaustausch zwischen seinem kalten und seinem warmen Ende klein bleibt. Sein thermischer Ausdehnungskoeffizient und seine spezifische Wärme­kapazität müssen gering sein. Ebenso muß er eine geringe Wasser­aufnahme haben (Hygroskopie).A displacer, which usually houses a regenerator (two-way heat exchanger) inside, must have the following properties: Its strength, especially at the low temperatures that occur, its sliding properties and its aging resistance must be good. It must be a poor heat conductor so that the heat exchange between its cold and warm ends remains small. Be coefficient of thermal expansion and its specific heat capacity must be low. He must also have a low water absorption (hygroscopy).

Diese Eigenschaften haben die bisher bekannten Verdränger von Refrigeratoren. diese werden zerspanend aus Rohlingen herge­stellt, wobei die Rohlinge aus einem Gewebekunstsoff bestehen, dessen Kunststoffanteil Phenolharz oder Epoxiharz ist. Bei dieser Art und Weise der Herstellung der Verdränger entstehen relativ hohe Materialverluste bei einem relativ hohen Materialpreis. Die zerspanende Herstellung ist aufwendig und kostspielig. Das Material nimmt während der Herstellung Feuchtigkeit auf, so daß aufwendige Trocknungsprozesse erforderlich sind. Fertige Ver­dränger müssen unter Schutzgas aufbewahrt werden, um eine Feuch­tigkeitsaufnahme zu vermeiden.These properties are known from the previously known refrigerators. these are machined from blanks, whereby the blanks consist of a woven plastic material, the plastic part of which is phenolic resin or epoxy resin. In this way of producing the displacer, relatively high material losses occur at a relatively high material price. The machining production is complex and costly. The material absorbs moisture during manufacture, so that complex drying processes are required. Completed displacers must be kept under protective gas to avoid moisture absorption.

Die vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung eines aus Kunststoff bestehenden Verdrängers sowie einen danach hergestellten Verdränger anzuge­ben, bei dem diese Nachteile nicht mehr bestehen.The present invention has for its object to provide a method for producing a displacer made of plastic and a displacer manufactured according to it, in which these disadvantages no longer exist.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die den Verdränger bildenden Teile aus einem Thermoplast durch Spritzen hergestellt werden. Vorzugsweise wird als Thermoplast hochmole­kulares Niederdruck-Polyäthylen verwendet. Auch die Verwendung von Polyamiden und - imiden ist möglich. Bei einer Herstellung von Verdrängern entfallen zerspanende Schritte nahezu vollständig. Die Gefahr überhöhter Feuchtigkeitsaufnahme besteht nicht mehr, so daß weiterhin sowohl die aufwendigen Trocknungsprozesse als auch die Aufbewahrung fertiger Verdränger unter Schutzgas ent­fallen können.According to the invention, this object is achieved in that the parts forming the displacer are produced from a thermoplastic by injection molding. High-molecular low-pressure polyethylene is preferably used as the thermoplastic. The use of polyamides and imides is also possible. Machining steps are almost completely eliminated in the manufacture of displacers. The risk of excessive moisture absorption no longer exists, so that both the costly drying processes and the storage of finished displacers under protective gas can still be dispensed with.

Besonders vorteilhaft ist, daß bereits während des erfindungs­gemäßen Herstellungsschrittes Lippendichtungen, Gleit- bzw. Stützelemente, Elemente für Schnappverschlüsse und Schnappver­bindungsgelenke mitangespritzt werden können. Auch Verstärkungs­elemente, die ein Schrumpfen des Materials insbesondere in Bereichen der Dichtungen verhindern sollen, können während des Herstellungsprozesses integriert werden.It is particularly advantageous that lip seals, sliding or supporting elements, elements for snap locks and snap connection joints can be molded on during the manufacturing step according to the invention. Reinforcing elements, which are intended to prevent the material from shrinking, in particular in the areas of the seals, can also be integrated during the production process.

Weitere Vorteile und Einzelheiten der Erfindung sollen anhand von in den Figuren 1 bis 4 dargestellten Ausführungsbeispielen erläutert werden.Further advantages and details of the invention will be explained on the basis of the exemplary embodiments illustrated in FIGS. 1 to 4.

Figur 1 zeigt einen nach dem erfindungsgemäßen Verfahren herge­stellten Verdränger 1 mit einem Hohlraum 2, der den nicht darge­stellten Regenerator aufnimmt. Der im wesentlichen zylindrische Verdränger, dessen Achse mit 3 bezeichnet ist, besteht im we­sentlichen aus zwei Teilen, nämlich einem Gehäuseteil 4 und einem Bodenteil 5. An das Gehäuseteil 4 ist der Antriebskolben 6 angespritzt. Auch die Bohrungen 7 und 8 im Gehäuseteil 4 und 11, 12 im Bodenteil 5 können gleichzeitig mit dem Spritzvorgang hergestellt werden. Ein besonderer Bearbeitungsschritt ist nicht erforderlich.Figure 1 shows a displacer 1 produced by the method according to the invention with a cavity 2, which receives the regenerator, not shown. The essentially cylindrical displacer, the axis of which is designated 3, consists essentially of two parts, namely a housing part 4 and a base part 5. The drive piston 6 is injection molded onto the housing part 4. The bores 7 and 8 in the housing part 4 and 11, 12 in the base part 5 can also be produced simultaneously with the spraying process. A special processing step is not necessary.

Figur 1 zeigt zwei verschiedenartig gestaltete Dichtungssysteme 13 und 14. Das Dichtungssystem 13 umfaßt - wie vielfach vorbe­kannt - einen Kunstsoffdichtring 15 mit unterlegtem O-Ring 16. Der Ring 15 kann ebenfalls durch Spritzen hergestellt werden. Die Außennut 17 am Verdrängergehäuse 4 ist ebenfalls während des Spritzvorganges entstanden.FIG. 1 shows two differently designed sealing systems 13 and 14. The sealing system 13 comprises - as is often known - a plastic sealing ring 15 with an O-ring 16 underneath it. The ring 15 can also be produced by injection molding. The outer groove 17 on the displacer housing 4 was also created during the injection molding process.

Das Dichtungssystem 14 umfaßt eine umlaufende Lippe 18, der eine ebenfalls umlaufende Aussparung 19 im Verdrängergehäuse 4 zuge­ordnet ist. Lippe 18 und Aussparung 19 können ebenfalls gleich­zeitig mit dem Spritzvorgang entstehen.The sealing system 14 comprises a circumferential lip 18, which is also assigned a circumferential recess 19 in the displacer housing 4. Lip 18 and recess 19 can also arise simultaneously with the spraying process.

Der Boden 5 ist Gehäuseteil 4 mittels eines Schnappver­schlusses 21 gehaltert. Zur Bildung des Schnappverschlusses 21 sind am Bodenteil 5 und am Gehäuseteil 4 sich axial erstreckende Rastabschnitte 22 und 23 vorhanden, welche sich axial erstrecken und umlaufend oder abschnittsweise ausgebildet sein können. Zur Sicherung der Verbindung ist der innere Rastabschnitt 23 mit einem inneren Verstärkungsring 14 ausgerüstet, welcher z. B. aus Edelstahl besteht. Dieser Ring 24 verhindert eine Einwärtsbewe­gung des Rastabschnittes 23, die in Folge einer Werkstoff­schrumpfung eintreten könnte.The base 5 is held in the housing part 4 by means of a snap lock 21. To form the snap closure 21, axially extending latching sections 22 and 23 are provided on the bottom part 5 and on the housing part 4, which extend axially and can be circumferential or section-wise. To secure the connection, the inner locking section 23 is equipped with an inner reinforcing ring 14, which, for. B. consists of stainless steel. This ring 24 prevents inward movement of the locking section 23, which could occur as a result of material shrinkage.

Am Bodenteil 5 ist weiterhin ein Stumpf 25 angespritzt, der der Halterung eines weiteren Verdrängers 26 einer zweiten Refrigera­torstufe dient. Der Stumpf 25 ist mit einem ballig geformten Vorsprung 27 ausgerüstet. Dieser umlaufende Ring 27 greift in eine entsprechende Nut 28 einer rohrabschnittsförmigen Verlänge­rung 29 am Verdränger 26. Dadurch entsteht ein Schnappverbin­dungsgelenk, welches eine begrenzte Verschwenkbewegung des Verdrängers 26 zuläßt.A stump 25 is also molded onto the base part 5 and serves to hold a further displacer 26 of a second refrigerator stage. The stump 25 is equipped with a spherically shaped projection 27. This circumferential ring 27 engages in a corresponding groove 28 of an extension 29 in the form of a tubular section on the displacer 26. This creates a snap connection joint which permits a limited pivoting movement of the displacer 26.

Figur 2 zeigt eine Variante des Gelenkes nach Figur 1. Anstelle der balligen Formung des Endstückes 27 des Stumpfes 25 ist ein kugelschalenförmiger Abschnitt 30 a vorgesehen, der in eine korrespondierende Ausnehmung 30 b an der zweiten Stufe 26 ein­greift. Segmente 30 c umgreifen sichernd den Abschnitt 30a.FIG. 2 shows a variant of the joint according to FIG. 1. Instead of the spherical shape of the end piece 27 of the stump 25, a spherical shell-shaped section 30 a is provided which engages in a corresponding recess 30 b on the second step 26. Segments 30 c securely encompass section 30a.

Bei dem in Figur 3 dargestellten Verdränger 1 ist der Boden 5 mit dem Gehäuse 4 verschraubt. Der Boden 5 trägt einen sich axial durch das Gehäuse 4 erstreckenden Dorn 31, dessen Verlängerung der Antriebskolben 6 ist. Der Dorn 31 dient der Halterung eines Regenerators, der durch Wickeln eines Gewebebandes um den Dorn herum entsteht. Die Zuströmöffnung 32 für das Arbeitsgas ist kreisringförmig gestaltet. Die Innenseite des äußeren Gehäuse­teiles 14 ist in Höhe des Dichtungssystemes 13 mit einem Ver­stärkungsring 33 - wieder vorzugsweise aus Edelstahl - ausgerü­stet. Der Verstärkungsring 33 dient der Verhinderung eines Schrumpfens des Werkstoffes. Ein Schrumpfen des Werkstoffes im Bereich von Dichtungssystemen könnte ein Nachlassen der Dicht­kraft zur Folge haben.In the displacer 1 shown in Figure 3, the bottom 5 is screwed to the housing 4. The bottom 5 carries an axially extending through the housing 4 mandrel 31, the extension of which is the drive piston 6. The mandrel 31 serves to hold a regenerator, which is created by winding a fabric tape around the mandrel. The inflow opening 32 for the working gas is circular. The inside of the outer housing part 14 is at the level of the sealing system 13 with a reinforcing ring 33 - again preferably made of stainless steel. The reinforcing ring 33 serves to prevent the material from shrinking. A shrinking of the material in the Area of sealing systems could result in a loss of sealing force.

Das dem Boden 5 zugewandte Ende des Gehäuseteiles 4 ist beim Ausführungsbeispiel nach Figur 3 mit Lippenabschnitten 34, 35 ausgerüstet, von denen mehrere gleichmäßig auf den Umfang ver­teilt angeordnet sind. Jedem Lippenabschnitt 34 bzw. 35 ist eine Aussparung 36 bzw. 37 zugeordnet. Figur 4 zeigt eine Draufsicht auf den Lippenabschnitt 35 mit seiner Aussparung 37. Lippenab­schnitte dieser Art bilden eine Art Gleitkufe mit Stützfunktion.In the exemplary embodiment according to FIG. 3, the end of the housing part 4 facing the bottom 5 is equipped with lip sections 34, 35, several of which are arranged evenly distributed over the circumference. A recess 36 or 37 is assigned to each lip section 34 or 35. Figure 4 shows a plan view of the lip portion 35 with its recess 37. Lip portions of this type form a type of skid with a support function.

Der mit den beschriebenen Ausführungsbeispielen verbundene Vorteil liegt im wesentlichen darin, daß die dargestellten Verdränger in einfacher Weise durch Spritzen hergestellt werden können. die Verstärkungsringe 24, 33 können ebenfalls an- oder eingespritzt werden. Auch die Nuten 17, die Lichtlippen 18, 34, 35, die Rastabschnitte 21, 23 und das Schnappgelenk 27 bis 29 können während des Spritzvorganges entstehen.The advantage associated with the described embodiments is essentially that the displacers shown can be produced in a simple manner by spraying. the reinforcement rings 24, 33 can also be injected or injected. The grooves 17, the light lips 18, 34, 35, the latching sections 21, 23 and the snap joint 27 to 29 can also be formed during the spraying process.

Claims (13)

1. Verfahren zur Herstellung eines aus Kunststoff bestehenden Verdrängers (1) für den Kaltkopf eines Kryo-Refrigerators, dadurch gekennzeichnet, daß die den Verdränger bildenden Teile (4, 5) aus einem Thermoplast durch Spritzen herge­stellt werden.1. A method for producing a plastic displacer (1) for the cold head of a cryo-refrigerator, characterized in that the parts forming the displacer (4, 5) are made of a thermoplastic by injection molding. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die den Verdränger bildenden Teile (4, 5) aus einem hochmoleku­laren Niederdruck-Polyäthylen, Polyamid, Polyimid oder dgl. gespritzt werden.2. The method according to claim 1, characterized in that the parts forming the displacer (4, 5) are injected from a high-molecular low-pressure polyethylene, polyamide, polyimide or the like. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß Verstärkungsbauteile (24, 33), vorzugsweise aus Edel­stahl, in die Kunststoffkörper (4, 5) eingespritzt werden.3. The method according to claim 1 or 2, characterized in that reinforcing components (24, 33), preferably made of stainless steel, are injected into the plastic body (4, 5). 4. Verfahren nach einem der Ansprüche 1 bis 3 dadurch gekenn­zeichnet, daß Nuten (17) zur Aufnahme von Dichtsystemen und/oder Gasein- und Ausstromkanäle (7, 8) mitgespritzt werden.4. The method according to any one of claims 1 to 3, characterized in that grooves (17) for receiving sealing systems and / or gas inlet and outlet channels (7, 8) are injected. 5. Nach einem Verfahren der Ansprüche 1 bis 4 hergestellter Verdränger, dadurch gekennzeichnet, daß er aus einem Gehäu­seteil (4) und einem Bodenteil (5) besteht.5. According to a method of claims 1 to 4 displacer, characterized in that it consists of a housing part (4) and a bottom part (5). 6. Verdränger nach Anspruch 5, dadurch gekennzeichnet, daß Bodenteil (5) und Gehäuseteil (4) durch einen Schnappver­schluß (21) miteinander verbunden sind.6. Displacer according to claim 5, characterized in that the base part (5) and housing part (4) are connected to one another by a snap lock (21). 7. Verdränger nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß das Bodenteil (5) einen in das Innere des Verdrängers (1) hineinragenden zentralen Dorn (31) trägt.7. Displacer according to claim 5 or 6, characterized in that the bottom part (5) carries a central mandrel (31) projecting into the interior of the displacer (1). 8. Verdränger nach Anspruch 7, dadurch gekennzeichnet, daß der zentrale Dorn (31) den Antriebskolben (6) trägt.8. Displacer according to claim 7, characterized in that the central mandrel (31) carries the drive piston (6). 9. Verdränger nach einem der Ansprüche 5 bis 8, dadurch gekenn­zeichnet, daß das Bodenteil mit einem zentralen Stumpf (25) ausgerüstet ist, der zur Bildung einer Gelenkverbindung mit einem balligen Element (27) versehen ist.9. Displacer according to one of claims 5 to 8, characterized in that the bottom part is equipped with a central stump (25) which is provided with a spherical element (27) to form an articulated connection. 10. Zweistufiger Verdränger nach Anspruch 9, dadurch gekenn­zeichnet, daß auch der Verdränger (26) der zweiten Stufe durch Spritzen hergestellt ist und daß die beiden Stufen miteinander durch ein Schnappverbindungsgelenk (27, 28, 29) miteinander verbunden sind.10. Two-stage displacer according to claim 9, characterized in that the displacer (26) of the second stage is produced by injection molding and that the two stages are connected to one another by a snap connection joint (27, 28, 29). 11. Verdränger nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß lippenförmige Dichtungen (18) oder Stützelemente (34, 35) angespritzt sind.11. Displacer according to one of the preceding claims, characterized in that lip-shaped seals (18) or support elements (34, 35) are injection molded. 12. Verdränger nach 3, dadurch gekennzeichnet, daß in Höhe einer Nut (17) für ein Dichtsystem (13) ein Verstärkungsring (33) vorgesehen ist.12. Displacer according to 3, characterized in that a reinforcing ring (33) is provided at the level of a groove (17) for a sealing system (13). 13. Verdränger nach einem der Ansprüche 5 bis 12, dadurch gekennzeichnet, daß die ringförmigen Dichtungsringe (15) des Dichtungssystems (13) ebenfalls gespritzt werden.13. Displacer according to one of claims 5 to 12, characterized in that the annular sealing rings (15) of the sealing system (13) are also injected.
EP89105776A 1988-04-14 1989-04-01 Method of making a displacer for the cold finger of a cryogenic refrigerator and displacer made according to this method Expired - Lifetime EP0337227B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89105776T ATE87083T1 (en) 1988-04-14 1989-04-01 PROCESS FOR MAKING A DISPLACER FOR THE COLD HEAD OF A CRYO-REFRIGERATOR AND DISPLACER MANUFACTURED BY THIS PROCESS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3812430 1988-04-14
DE3812430A DE3812430A1 (en) 1988-04-14 1988-04-14 METHOD FOR PRODUCING A DISPLACER FOR THE COLD HEAD OF A CRYO REFRIGERATOR AND DISPLACER PRODUCED BY THIS PROCESS

Publications (3)

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EP0337227A2 true EP0337227A2 (en) 1989-10-18
EP0337227A3 EP0337227A3 (en) 1990-12-05
EP0337227B1 EP0337227B1 (en) 1993-03-17

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EP89105776A Expired - Lifetime EP0337227B1 (en) 1988-04-14 1989-04-01 Method of making a displacer for the cold finger of a cryogenic refrigerator and displacer made according to this method

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EP (1) EP0337227B1 (en)
JP (1) JPH029613A (en)
AT (1) ATE87083T1 (en)
DE (2) DE3812430A1 (en)

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EP0919734A1 (en) * 1997-11-28 1999-06-02 Koninklijke Philips Electronics N.V. Interlocking system for fastening plastics shells

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JPS5958022A (en) * 1982-09-28 1984-04-03 Nippon Polyurethan Kogyo Kk Preparation of stabilized polyisocyanate composition

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US4409793A (en) * 1982-04-19 1983-10-18 The United States Of America As Represented By The Secretary Of The Army Dual pneumatic volume for cryogenic cooler
US4432925A (en) * 1982-06-11 1984-02-21 Standard Oil Company, (Indiana) Composite piston ring and process
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DE3044427A1 (en) * 1980-11-26 1982-06-24 Leybold-Heraeus GmbH, 5000 Köln DISPLACEMENT FOR REFRIGERATORS
US4409793A (en) * 1982-04-19 1983-10-18 The United States Of America As Represented By The Secretary Of The Army Dual pneumatic volume for cryogenic cooler
US4432925A (en) * 1982-06-11 1984-02-21 Standard Oil Company, (Indiana) Composite piston ring and process
US4505119A (en) * 1982-12-09 1985-03-19 Nachman Pundak Flexible linkage for the displacer assembly in cryogenic coolers

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
EP0919734A1 (en) * 1997-11-28 1999-06-02 Koninklijke Philips Electronics N.V. Interlocking system for fastening plastics shells
US6382867B2 (en) 1997-11-28 2002-05-07 U.S. Philips Corporation Joining device for firmly joining plastic joining parts together
CN1096351C (en) * 1997-11-28 2002-12-18 皇家菲利浦电子有限公司 Joining device for firmly joining plastic joining parts together
KR100572701B1 (en) * 1997-11-28 2006-09-27 코닌클리즈케 필립스 일렉트로닉스 엔.브이. Joining Device and Joining Parts Comprising the Joining Device

Also Published As

Publication number Publication date
JPH029613A (en) 1990-01-12
ATE87083T1 (en) 1993-04-15
EP0337227B1 (en) 1993-03-17
DE3812430A1 (en) 1989-10-26
EP0337227A3 (en) 1990-12-05
DE58903768D1 (en) 1993-04-22

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