WO2005028970A1 - Cold generator - Google Patents

Cold generator Download PDF

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Publication number
WO2005028970A1
WO2005028970A1 PCT/EP2004/009098 EP2004009098W WO2005028970A1 WO 2005028970 A1 WO2005028970 A1 WO 2005028970A1 EP 2004009098 W EP2004009098 W EP 2004009098W WO 2005028970 A1 WO2005028970 A1 WO 2005028970A1
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WO
WIPO (PCT)
Prior art keywords
holding device
check valve
pressure
sealing element
valve
Prior art date
Application number
PCT/EP2004/009098
Other languages
German (de)
French (fr)
Inventor
Mario Pietrangeli
Holger Dietz
Original Assignee
Leybold Vacuum Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Leybold Vacuum Gmbh filed Critical Leybold Vacuum Gmbh
Publication of WO2005028970A1 publication Critical patent/WO2005028970A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/06—Check valves with guided rigid valve members with guided stems
    • F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring

Definitions

  • the invention relates to a refrigeration device with a pulsating refrigerator, which has a pressure connection that can be connected to a high pressure source and a low pressure connection connected to a check valve, the check valve containing a sealing element that can be moved by fluid pressure.
  • a refrigerator is connected to a circuit with a pressure source.
  • the circuit contains a check valve in the return between the refrigerator and the pressure source, which is permeable in the direction mentioned, but blocks from the inlet of the pressure source to the low-pressure connection of the refrigerator.
  • a refrigerator is, for example, a cold head as described in EP 0 437 661 AI (Leybold AG). Such a cold head has a high-pressure connection and a low-pressure connection, which are connected to a helium compressor.
  • the cold pot works according to the Gifford / McMahon principle. It contains a displacer in a cylindrical working space, which is equipped with a central regenerator and is periodically moved by the piston. Such refrigerators are used in particular for vacuum cryopumps.
  • a helium gas mist that will flow back to the pressure source.
  • counter currents from the pressure source to the cold pot must be avoided. For this reason there is a check valve in the return line that leads from the cold head to the pressure source.
  • the check valve is exposed to numerous load cycles. This results in more than 60 million load cycles per year in standard applications. This means that the check valve is subject to high wear, with the constant risk of sudden failure.
  • the invention has for its object to contain a check valve between the refrigerator and the pressure source. to create the refrigeration unit, in which the load on the check valve is considerably reduced. Furthermore, it is an object of the invention to provide a check valve for lines or devices with pulsating flows, which has a long service life as a result of low stress.
  • the check valve contains a controllable holding device which holds the sealing element in the open state.
  • the special feature of the invention is that a holding device is provided which forcibly prevents the check valve from functioning and forcibly holds the sealing element in the open state. This ensures that the check valve does not follow the pulsating flow in its movements. Rather, it remains in the open state for as long as the excitation of the holding device lasts. Since the check valve does not perform any load cycles during operation, it is subject to very little wear.
  • the check valve with holding device is therefore particularly suitable for pulsating circuits that operate in continuous operation.
  • the invention is predominantly and particularly advantageously applicable to refrigerators which have a pressure source and a refrigerator, e.g. a cold head included.
  • the sealing element is connected to a valve rod, on which the holding device acts.
  • the valve rod enables both a guidance of the sealing element and the coupling of the Sealing element with the holding device.
  • it can serve as a guide element for a valve spring.
  • the holding device is expediently activated as long as the pressure generator is in operation and deactivated as long as the pressure generator is out of function.
  • the holding device is thus controlled as a function of the delivery pressure of the pressure source.
  • the holding force of the holding device is dimensioned such that the valve remains open in the event of pulsating pressure fluctuations.
  • 1 is a schematic representation of the circuit of a refrigeration generator
  • Fig. 2 shows a longitudinal section through a first embodiment of the check valve
  • Fig. 3 shows a longitudinal section through a second embodiment of the check valve.
  • a refrigeration generator 10 is shown, the fluid circuit with a pressure source 11, e.g. a compressor, a cold head 12 and a check valve 13.
  • the cold head 12 corresponds, for example, to that of EP 0 437 661 AI.
  • the cold head can be inserted into a cryopump to create a vacuum.
  • the cold head 12 has a high-pressure connection 14 and a low-pressure connection 15 connected to the check valve 13.
  • the check valve 13 is permeable from the low pressure connection 15 to the inlet of the pressure source 11, but blocks in the opposite direction.
  • the check valve 13 has the task of preventing the resulting helium gas oil mist from flowing back to the cold head 12 when the pressure source 11 is switched off or fails.
  • FIG. 2 shows a first embodiment of the check valve 13 according to the present invention.
  • the check valve has a valve housing 20 with an axial gas inlet 21 which opens into a valve chamber 22.
  • a gas outlet 23 leads out of the valve chamber 22.
  • a sealing element 24 which interacts with a valve seat 25 in order to close the gas inlet 21 in the closed state and to open the connection between the gas inlet 21 and the gas outlet 23 in the open state.
  • the sealing element 24 is here 'a valve disk. This is connected to a valve rod 26 which extends through the valve chamber 22.
  • the valve rod passes through a support wall 27.
  • the support wall 27 also serves to support a valve spring 28 which seals the sealing element 24. presses against the valve seat 25 and thus generates a bias for the check valve.
  • a holding device 30, which is able to hold the valve rod and thus also the sealing element 24 in the open state, acts on the rear end of the valve rod 26.
  • the holding device 30 is pneumatic or hydraulic in the present case. It has a cylinder 31 in which the rear end of the valve rod 26 can be moved as a piston.
  • a control line 32 creates a vacuum in the cylinder 31 to hold the valve rod 26 in the rear end position.
  • the holding device 30 is an electromagnetic holding device. It has a magnetic coil 33 which sits on a tubular core 34. When the magnetic coil 33 is electrically excited, the end of the valve rod 26 consisting of iron or ferrite material is drawn into the core 34, so that the sealing element 24 is held in the open position.
  • the holding device 30 can be controlled in both cases described. It needs external energy to hold the sealing element 24 in the open position. If this external energy fails, the holding device 30 has no effect.
  • the check valve then works like a conventional check valve.
  • the holding device 30 is excited or activated as long as the pressure source 11 generates pressure.
  • a pressure sensor can be provided which is connected to the outlet of the compressor and which supplies auxiliary energy to the holding device. direction 30 causes as long as the pressure exceeds a threshold.
  • the cold head 12 performs a pulsating operation at a frequency of approximately 2 Hz.
  • the holding device 30 prevents the check valve 13 from participating in the pulsation operation. It keeps the check valve open so that unnecessary load cycles are not carried out.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compressor (AREA)

Abstract

The invention relates to a cold generator comprising a circuit that contains a pressure source, a pulsating refrigeration element and a non-return valve. According to the invention, the non-return valve (13) is provided with a retaining device (30), which fixes the sealing element (24) in an open position. This prevents the non-return valve (13) from being influenced by the pulsations, thus avoiding increased wear on said valve (13).

Description

Kälteerzeuger cold generator
Die Erfindung betrifft einen Kälteerzeuger mit einem pulsierenden Refrigerator, der einen an eine Hochdruckquelle anschließbaren Druckanschluss und einen mit einem Rückschlagventil verbundenen Niederdruckanschluss aufweist, wobei das Rückschlagventil ein durch Fluiddruck bewegbares Dichtelement enthält.The invention relates to a refrigeration device with a pulsating refrigerator, which has a pressure connection that can be connected to a high pressure source and a low pressure connection connected to a check valve, the check valve containing a sealing element that can be moved by fluid pressure.
Rückschlagventile, die in Leitungen mit pulsierenden Strömungen eingesetzt werden, unterliegen häufigen Lastspielen, insbesondere wenn die betreffenden Geräte im Dauerbetrieb arbeiten. Hierbei kann es zu Abnutzungserscheinungen und F nktions- versagen kommen. Ein spezielles Anwendungsgebiet bilden Kälteerzeuger, die einen pulsierend arbeitenden Refrigerator enthalten. Der Refrigerator ist mit einer Druckquelle zu einem Kreislauf geschaltet. Der Kreislauf -enthält im Rücklauf zwischen Refrigerator und Druckquelle ein Rückschlagventil, das in der genannten Richtung durchlässig ist, vom Einlass der Druckquelle zum Niederdruckanschluss des Refrigerators jedoch sperrt. Ein Refrigerator ist beispielsweise ein Kaltkopf, wie er in EP 0 437 661 AI (Leybold AG) beschrieben ist. Ein solcher Kaltkopf weist einen Hochdruckanschluss und einen Niederdruckanschluss auf, die mit einem Helium-Kompressor verbunden werden. Der Kalt öpf arbeitet nach dem Gifford/McMahon- Prinzip. Er enthält in einem zylindrischen Arbeitsraum einen Verdränger, der mit einem zentralen Regenerator ausgerüstet ist und von dem Kolben periodisch bewegt wird. Derartige Kälteerzeuger werden insbesondere für Vakuum-Kryopumpen benutzt. Wenn die Druckquelle wegen' Beendigung des Arbeitsbetriebes o- der aus anderen Gründen stillgesetzt wird, entsteht an dem Kaltkopf ein Heliumgasnebel, der zur Druckquelle zurückfließen soll. Andererseits müssen Gegenströmungen von der Druckquelle zum Kalt öpf vermieden werden. Aus diesem Grund befindet sich in der Rücklaufleitung, die vom Kaltkopf zur Druckquelle führt, ein Rückschlagventil. Infolge des pulsierenden Betriebes des Kaltkopfes, der mit einer Frequenz von etwa 2 Hz arbeitet, ist das Rückschlagventil zahlreichen Lastspielen ausgesetzt. Dabei ergeben sich bei Standardanwendungen mehr als 60 Mio. Lastspiele pro Jahr. Dies bedeutet, dass das Rückschlagventil einem hohen Verschleiß ausgesetzt ist, mit der dauernden Gefahr eines plötzlichen Versagens.Check valves that are used in lines with pulsating flows are subject to frequent load cycles, especially if the devices in question are in continuous operation. This can lead to signs of wear and fail to come. A special area of application are refrigeration generators that contain a pulsating refrigerator. The refrigerator is connected to a circuit with a pressure source. The circuit contains a check valve in the return between the refrigerator and the pressure source, which is permeable in the direction mentioned, but blocks from the inlet of the pressure source to the low-pressure connection of the refrigerator. A refrigerator is, for example, a cold head as described in EP 0 437 661 AI (Leybold AG). Such a cold head has a high-pressure connection and a low-pressure connection, which are connected to a helium compressor. The cold pot works according to the Gifford / McMahon principle. It contains a displacer in a cylindrical working space, which is equipped with a central regenerator and is periodically moved by the piston. Such refrigerators are used in particular for vacuum cryopumps. When the pressure source o for 'Termination of the operation is stopped for other reasons, is produced at the cold head a helium gas mist that will flow back to the pressure source. On the other hand, counter currents from the pressure source to the cold pot must be avoided. For this reason there is a check valve in the return line that leads from the cold head to the pressure source. As a result of the pulsating operation of the cold head, which operates at a frequency of approximately 2 Hz, the check valve is exposed to numerous load cycles. This results in more than 60 million load cycles per year in standard applications. This means that the check valve is subject to high wear, with the constant risk of sudden failure.
Der Erfindung liegt die Aufgabe zugrunde, einen ein Rückschlagventil zwischen Refrigerator und Druckquelle enthalten- den Kälteerzeuger zu schaffen, bei dem die Belastung des Rückschlagventiles erheblich verringert ist. Ferner ist es Aufgabe der Erfindung, ein Rückschlagventil für Leitungen oder Geräte mit pulsierenden Strömungen zu schaffen, das infolge einer geringen Beanspruchung eine hohe Lebensdauer hat.The invention has for its object to contain a check valve between the refrigerator and the pressure source. to create the refrigeration unit, in which the load on the check valve is considerably reduced. Furthermore, it is an object of the invention to provide a check valve for lines or devices with pulsating flows, which has a long service life as a result of low stress.
Die Lösung dieser Aufgabe erfolgt erfindungsgemäß mit den Merkmalen des Patentanspruchs 1 bzw. des Patentanspruchs 7. Hiernach enthält das Rückschlagventil eine steuerbare Haltevorrichtung, die das Dichtelement im Offnungszustand hält.This object is achieved according to the invention with the features of patent claim 1 and of patent claim 7. According to this, the check valve contains a controllable holding device which holds the sealing element in the open state.
Die Besonderheit der Erfindung besteht darin, dass eine Haltevorrichtung vorgesehen ist, die die Funktion des Rückschlagventils zwangsweise unterbindet und das Dichtelement zwangsweise im Offnungszustand hält. Dadurch wird erreicht, dass das Rückschlagventil in seinen Bewegungen der pulsierenden Strömung nicht folgt. Vielmehr bleibt es solange im Offnungszustand, wie die Erregung der Haltevorrichtung dauert. Da das Rückschlagventil während des laufenden Betriebes keine Lastspiele ausführt, ist es nur einem sehr geringen Verschleiß unterworfen. Das Rückschlagventil mit Haltevorrichtung eignet sich daher besonders für im Dauerbetrieb arbeitende pulsierende Kreisläufe.The special feature of the invention is that a holding device is provided which forcibly prevents the check valve from functioning and forcibly holds the sealing element in the open state. This ensures that the check valve does not follow the pulsating flow in its movements. Rather, it remains in the open state for as long as the excitation of the holding device lasts. Since the check valve does not perform any load cycles during operation, it is subject to very little wear. The check valve with holding device is therefore particularly suitable for pulsating circuits that operate in continuous operation.
Die Erfindung ist vorwiegend und mit besonderem Vorteil bei Kälteerzeugern anwendbar, die in einem Kreislauf eine Druckquelle und einen Refrigerator, z.B. einen Kaltkopf, enthalten.The invention is predominantly and particularly advantageously applicable to refrigerators which have a pressure source and a refrigerator, e.g. a cold head included.
Gemäß einer bevorzugten Ausgestaltung der Erfindung ist das Dichtelement mit einer Ventilstange verbunden, auf die die Haltevorrichtung einwirkt. Die Ventilstange ermöglicht sowohl eine Führung des Dichtelements als auch die Kopplung des Dichtelements mit der Haltevorrichtung. Darüber hinaus kann sie als Führungselement für eine Ventilfeder dienen.According to a preferred embodiment of the invention, the sealing element is connected to a valve rod, on which the holding device acts. The valve rod enables both a guidance of the sealing element and the coupling of the Sealing element with the holding device. In addition, it can serve as a guide element for a valve spring.
Zweckmäßigerweise ist die Haltevorrichtung aktiviert, solange der Druckerzeuger in Funktion ist, und deaktiviert, solange der Druckerzeuger außer Funktion ist. Die Steuerung der Haltevorrichtung erfolgt somit in Abhängigkeit von dem Lieferdruck der Druckquelle. Andererseits besteht auch die Möglichkeit der Kopplung mit dem Schalter, über den die Druckquelle ein- und ausgeschaltet wird. Wichtig ist, dass bei einem Kälteerzeuger die Funktion der Haltevorrichtung beendet wird, wenn der von der Druckquelle gelieferte Druck nachlässt oder aufhört. Die Haltekraft der Haltevorrichtung ist so bemessen, dass das Ventil bei den auftretenden pulsierenden Druckschwankungen geöffnet bleibt. Beim Abschalten der Hilfsenergie ' der Haltevorrichtung oder beim Ausfall der Haltevorrichtung nimmt das Rückschlagventil sein normales Betriebsverhalten an, d.h. es wird von den auftretenden Druckschwankungen geöffnet und geschlossen.The holding device is expediently activated as long as the pressure generator is in operation and deactivated as long as the pressure generator is out of function. The holding device is thus controlled as a function of the delivery pressure of the pressure source. On the other hand, there is also the possibility of coupling with the switch that switches the pressure source on and off. It is important that the function of the holding device is terminated in the case of a cold generator when the pressure supplied by the pressure source decreases or ceases. The holding force of the holding device is dimensioned such that the valve remains open in the event of pulsating pressure fluctuations. When the auxiliary energy of the holding device is switched off or the holding device fails, the check valve assumes its normal operating behavior, i.e. it is opened and closed by the pressure fluctuations that occur.
Im Folgenden werden unter Bezugnahme auf die Zeichnungen Ausführungsbeispiele der Erfindung näher erläutert.Exemplary embodiments of the invention are explained in more detail below with reference to the drawings.
Es zeigen:Show it:
Fig. 1 eine schematische Darstellung des Kreislaufs eines Kälteerzeugers,1 is a schematic representation of the circuit of a refrigeration generator,
Fig. 2 einen Längsschnitt durch eine erste Ausführungsform des Rückschlagventils, und Fig. 3 einen Längsschnitt durch eine zweite Ausführungsform des Rückschlagventils.Fig. 2 shows a longitudinal section through a first embodiment of the check valve, and Fig. 3 shows a longitudinal section through a second embodiment of the check valve.
In Figur 1 ist ein Kälteerzeuger 10 dargestellt, der einen Fluidkreislauf mit einer Druckquelle 11, z.B. einem Kompressor, einem Kaltkopf 12 und einem Rückschlagventil 13 aufweist. Der Kaltköpf 12 entspricht beispielsweise demjenigen von EP 0 437 661 AI. Der Kaltkopf kann in eine Kryopumpe eingesetzt werden, um ein Vakuum zu erzeugen. Der Kaltköpf 12 weist einen Hochdruckanschluss 14 und einen mit dem Rückschlagventil 13 verbundenen Niederdruckanschluss 15 auf. Das Rückschlagventil 13 ist von dem Niederdruckanschluss 15 zum Einlass der Druckquelle 11 durchlässig, sperrt aber in Gegenrichtung. Das Rückschlagventil 13 hat die Aufgabe, beim Abschalten oder einem Ausfall der Druckquelle 11 zu verhindern, dass der entstehende Heliumgasölnebel zu dem Kaltkopf 12 zurückströmt.In Figure 1, a refrigeration generator 10 is shown, the fluid circuit with a pressure source 11, e.g. a compressor, a cold head 12 and a check valve 13. The cold head 12 corresponds, for example, to that of EP 0 437 661 AI. The cold head can be inserted into a cryopump to create a vacuum. The cold head 12 has a high-pressure connection 14 and a low-pressure connection 15 connected to the check valve 13. The check valve 13 is permeable from the low pressure connection 15 to the inlet of the pressure source 11, but blocks in the opposite direction. The check valve 13 has the task of preventing the resulting helium gas oil mist from flowing back to the cold head 12 when the pressure source 11 is switched off or fails.
In Figur 2 ist eine erste Ausführungsform des Rückschlagventils 13 gemäß der vorliegenden Erfindung dargestellt. Das Rückschlagventil weist ein Ventilgehäuse 20 auf mit einem axialen Gaseinlass 21, der in eine Ventilkammer 22 mündet. Aus der Ventilkammer 22 führt ein Gasauslass 23 heraus. In der Ventilkammer befindet sich ein Dichtelement 24, das mit einem Ventilsitz 25 zusammenwirkt, um im Schließzustand den Gaseinlass 21 zu verschließen und im Offnungszustand die Verbindung zwischen Gaseinlass 21 und Gasauslass 23 freizugeben. Das Dichtelement 24 ist hier' eine Ventilscheibe. Diese ist mit einer Ventilstange 26 verbunden, welche sich durch die Ventil- kammer 22 hindurch erstreckt. Die Ventilstange führt durch eine Stützwand 27 hindurch. Die Stützwand 27 dient ferner zum Abstützen einer Ventilfeder 28, welche das Dichtelement 24 ge- gen den Ventilsitz 25 drückt und somit eine Vorspannung für das Rückschlagventil erzeugt.FIG. 2 shows a first embodiment of the check valve 13 according to the present invention. The check valve has a valve housing 20 with an axial gas inlet 21 which opens into a valve chamber 22. A gas outlet 23 leads out of the valve chamber 22. In the valve chamber there is a sealing element 24 which interacts with a valve seat 25 in order to close the gas inlet 21 in the closed state and to open the connection between the gas inlet 21 and the gas outlet 23 in the open state. The sealing element 24 is here 'a valve disk. This is connected to a valve rod 26 which extends through the valve chamber 22. The valve rod passes through a support wall 27. The support wall 27 also serves to support a valve spring 28 which seals the sealing element 24. presses against the valve seat 25 and thus generates a bias for the check valve.
Auf das rückwärtige Ende der Ventilstange 26 wirkt eine Haltevorrichtung 30, die imstande ist, die Ventilstange und somit auch das Dichtelement 24 im Offnungszustand festzuhalten. Die Haltevorrichtung 30 ist im vorliegenden Fall pneumatisch oder hydraulisch. Sie weist einen Zylinder 31 auf, in welchem das rückwärtige Ende der Ventilstange 26 als Kolben bewegbar ist. Eine Steuerleitung 32 erzeugt in dem Zylinder 31 ein Vakuum, um die Ventilstange 26 in der rückwärtigen Endstellung festzuhalten.A holding device 30, which is able to hold the valve rod and thus also the sealing element 24 in the open state, acts on the rear end of the valve rod 26. The holding device 30 is pneumatic or hydraulic in the present case. It has a cylinder 31 in which the rear end of the valve rod 26 can be moved as a piston. A control line 32 creates a vacuum in the cylinder 31 to hold the valve rod 26 in the rear end position.
Bei dem Ausführungsbeispiel von Figur 3 ist die Haltevorrichtung 30 eine elektromagnetische Haltevorrichtung. Sie weist eine Magnetspule 33 auf, die auf einem rohrförmigen Kern 34 sitzt. Bei elektrischer Erregung der Magnetspule 33 wird das aus Eisen oder Ferritmaterial bestehende Ende der Ventilstange 26 in den Kern 34 eingezogen, so dass das Dichtelement 24 in der Öffnungsstellung gehalten wird.In the embodiment of Figure 3, the holding device 30 is an electromagnetic holding device. It has a magnetic coil 33 which sits on a tubular core 34. When the magnetic coil 33 is electrically excited, the end of the valve rod 26 consisting of iron or ferrite material is drawn into the core 34, so that the sealing element 24 is held in the open position.
Die Haltevorrichtung 30 ist in beiden beschriebenen Fällen steuerbar. Sie braucht externe Energie, um das Dichtelement 24 in der Öffnungsstellung festzuhalten. Bei einem Ausfall dieser externen Energie ist die Haltevorrichtung 30 wirkungslos. Das Rückschlagventil arbeitet dann wie ein konventionelles Rückschlagventil .The holding device 30 can be controlled in both cases described. It needs external energy to hold the sealing element 24 in the open position. If this external energy fails, the holding device 30 has no effect. The check valve then works like a conventional check valve.
Die Haltevorrichtung 30 ist erregt oder aktiviert, solange die Druckquelle 11 Druck erzeugt. Hierzu kann ein Drucksensor vorgesehen sein, der mit dem Auslass des Kompressors verbunden ist und der die Zuführung von Hilfsenergie zu der Haltevor- richtung 30 veranlasst, solange der Druck einen Schwellenwert übersteigt.The holding device 30 is excited or activated as long as the pressure source 11 generates pressure. For this purpose, a pressure sensor can be provided which is connected to the outlet of the compressor and which supplies auxiliary energy to the holding device. direction 30 causes as long as the pressure exceeds a threshold.
Der Kaltkopf 12 führt einen pulsierenden Betrieb mit einer Frequenz von etwa 2 Hz durch. Die Haltevorrichtung 30 verhindert, dass das Rückschlagventil 13 den Pulsationsbetrieb mitmacht. Es hält das Rückschlagventil im Offnungszustand, so dass keine unnötigen Lastspiele durchgeführt werden.The cold head 12 performs a pulsating operation at a frequency of approximately 2 Hz. The holding device 30 prevents the check valve 13 from participating in the pulsation operation. It keeps the check valve open so that unnecessary load cycles are not carried out.
Durch die vorstehende Beschreibung spezieller Ausführungsbeispiele wird der Schutzbereich, der durch die Patentansprüche bestimmt wird, nicht eingeschränkt. The scope of protection, which is determined by the patent claims, is not restricted by the above description of specific exemplary embodiments.

Claims

PATENTANSPRÜCHE
1. Kälteerzeuger mit einem pulsierenden Refrigerator (12), der einen an eine Druckquelle (11) anschließbaren Hoch— druckanschluss (14) und einen mit einem Rückschlagventil (13) verbundenen Niederdruckanschluss (15) aufweist, wobeά das Rückschlagventil (13) ein durch Fluiddruck bewegbares Dichtelement (24) enthält, d a d u r c h g e k e n n z e i c h n e t , dass das Rückschlagventil (13) eine steuerbare Haltevor— richtung (30) enthält, die das Dichtelement (24) im Offnungszustand festhält.1. Refrigerator with a pulsating refrigerator (12) which has a high-pressure connection (14) which can be connected to a pressure source (11) and a low-pressure connection (15) connected to a check valve (13), the check valve (13) being activated by fluid pressure contains movable sealing element (24), characterized in that the check valve (13) contains a controllable holding device (30) which holds the sealing element (24) in the open state.
2. Kälteerzeuger nach Anspruch 1, dadurch gekennzeichnet r dass das Dichtelement (24) mit einer Ventilstange (26) verbunden ist, auf die die Haltevorrichtung (30) einwirkt.2. cold generator as claimed in claim 1, r characterized in that the sealing element (24) connected to a valve rod (26) is acted on by the holding device (30).
3. Kälteerzeuger nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Haltevorrichtung (30) aktiviert ist, solange der Druckerzeuger (11) in Funktion ist, und deaktiviert wird, wenn der Druckerzeuger außer Funktion ist.3. Refrigerator according to claim 1 or 2, characterized in that the holding device (30) is activated as long as the pressure generator (11) is in operation, and is deactivated when the pressure generator is out of function.
4. Kälteerzeuger nach einem der Ansprüche 1-3, dadurch gekennzeichnet, dass die Haltevorrichtung (30) eine elektromagnetische Haltevorrichtung ist.4. Refrigerator according to one of claims 1-3, characterized in that the holding device (30) is an electromagnetic holding device.
5. Kälteerzeuger nach einem der Ansprüche 1-4, dadurch gekennzeichnet, dass die Haltevorrichtung eine Fluid betätigte Haltevorrichtung ist. Kälteerzeuger nach einem der Ansprüche 1-5, dadurch gekennzeichnet, dass die Haltevorrichtung (30) im energielosen Zustand das Dichtelement (24) freigibt. 5. Refrigerator according to one of claims 1-4, characterized in that the holding device is a fluid-operated holding device. Refrigerator according to one of claims 1-5, characterized in that the holding device (30) releases the sealing element (24) in the de-energized state.
PCT/EP2004/009098 2003-08-29 2004-08-13 Cold generator WO2005028970A1 (en)

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Application Number Priority Date Filing Date Title
DE10339843.0 2003-08-29
DE10339843A DE10339843A1 (en) 2003-08-29 2003-08-29 Refrigeration circuit for driving freezer head unit for cryogenic purposes has back pressure valve and release system with pneumatic or hydraulic control

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MD4409C1 (en) * 2015-04-10 2016-10-31 Ион ЧЕРЕМПЕЙ Cryogenic gas-turbine plant with closed circuit

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GB1350379A (en) * 1970-06-22 1974-04-18 Adan Hydraulics Ltd Non-return fluid-flow valves
US3991586A (en) * 1975-10-03 1976-11-16 The United States Of America As Represented By The Secretary Of The Army Solenoid controlled cold head for a cryogenic cooler
DE2831697A1 (en) * 1978-07-19 1980-01-31 Friedrich Freimuth Hydraulically released non-return valve - has release plunger whose stem acts against spring loaded plug to restrict return flow
EP0335643A2 (en) * 1988-03-28 1989-10-04 Mitsubishi Denki Kabushiki Kaisha Gas refrigerator
EP0437661A1 (en) 1990-01-18 1991-07-24 Leybold Aktiengesellschaft Cold finger with a Gifford-McMahon cryogenic regrigerator
US5701743A (en) * 1995-11-01 1997-12-30 Advanced Mobile Telecommunication Technology Inc. Pulse tube refrigerator
US6370908B1 (en) * 1996-11-05 2002-04-16 Tes Technology, Inc. Dual evaporator refrigeration unit and thermal energy storage unit therefore
DE19721356A1 (en) * 1997-05-22 1998-12-03 Gerhard Habla Back-flow prevention valve operated by hydraulic or pneumatic force

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