EP0243746A1 - Device for securing the supply of cold to a user of cold - Google Patents

Device for securing the supply of cold to a user of cold Download PDF

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Publication number
EP0243746A1
EP0243746A1 EP87105202A EP87105202A EP0243746A1 EP 0243746 A1 EP0243746 A1 EP 0243746A1 EP 87105202 A EP87105202 A EP 87105202A EP 87105202 A EP87105202 A EP 87105202A EP 0243746 A1 EP0243746 A1 EP 0243746A1
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EP
European Patent Office
Prior art keywords
valve
liquid gas
gas
temperature sensor
liquid
Prior art date
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Granted
Application number
EP87105202A
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German (de)
French (fr)
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EP0243746B1 (en
Inventor
Willi Dipl.-Ing. Weber
Franz Dipl.-Ing. Garnreiter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde Gas AG
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Linde GmbH
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Priority to AT87105202T priority Critical patent/ATE55826T1/en
Publication of EP0243746A1 publication Critical patent/EP0243746A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter

Definitions

  • the invention relates to a device for ensuring the cooling supply of a cooling consumer, in which liquid gas is supplied from a storage container via a feed line with an intermediate liquid gas valve to a liquid gas extraction device.
  • the permanent supply of cooling to a cooling consumer is relevant in a wide variety of technical fields.
  • Devices for cooling supply are used wherever objects or substances are to be quickly cooled to low temperatures.
  • the liquefied gas used e.g. liquid nitrogen
  • the liquid gas is fed under pressure from the storage tank to a phase separator, the liquid level being determined via a measuring device and being connected via a control unit to a control valve for discharging the resulting vapors of the liquid gas.
  • Liquid nitrogen can be drawn from the bottom of the phase separator without bubbles.
  • a separate insulated collecting container is necessary for the phase separator for separating gas and liquid phases. Thus, more space must be used to install this device.
  • the invention is therefore based on the object of developing a device of the type described above for the cooling supply of a refrigeration consumer, with which it can be ensured without complex and expensive construction that the liquid refrigerant is constantly present, in particular even after withdrawal breaks at the end of a liquefied gas supply line at the liquefied petroleum gas sampling device can be removed.
  • This object is achieved in that a temperature sensor and a tapping point for vaporized liquid gas are arranged in the liquid gas line, which with a gas blow-off valve is equipped, the temperature sensor being connected to the gas blow-off valve via a limit indicator.
  • the device according to the invention has the effect that, at the start of cooling, liquid cold gas is present at the extraction valve of the cooling consumer, regardless of the duration of the interruption of the cooling process. Dead times after cooling breaks can thus be avoided.
  • the compact design of the device according to the invention has the advantage that, in contrast to the phase separator, the device takes up little space.
  • the device according to the invention advantageously results in the following mode of operation:
  • the liquid refrigerant flows from the storage container via the main line to the refrigeration consumer after the liquefied gas extraction valve has been opened.
  • a temperature sensor monitors the temperature of the liquid gas and measures the temperature difference between the liquid phase and the gas phase of the refrigerant
  • the measured values are passed on to a limit switch, which thereby controls a gas blow-off valve that is installed in the gas extraction line.
  • a limit switch which thereby controls a gas blow-off valve that is installed in the gas extraction line.
  • the G opens asabblasventil that in an advantageous variant of the invention Device is a low temperature solenoid valve. Gas is discharged via a removal line for the gaseous phase of the liquid gas, which is arranged between the temperature sensor and the liquid gas extraction valve in an advantageous variant of this device, until the temperature sensor is again flushed with liquid gas. This cools the temperature sensor and the associated limit switch gives a signal to close the valve.
  • the escaping gaseous refrigerant can be released outdoors or returned to the storage tank via a condenser. If the signal to close the valve is given via the temperature sensor, it is ensured that only liquid refrigerant is present at the sampling valve.
  • the device according to the invention is preferably used in batch-wise cooling and frost processes in cutters and mixers as well as in the production or treatment of milk powder, textiles, plastic films, tubular liners, volcanic fibers, etc.

Abstract

1. A device for ensuring the supply to a cold-user with fluid liquid gas in which the liquid gas is fed to a user from a supply container via a liquid gas pipe-line (1) with a series-connected liquid gas valve (5), wherein in the liquid gas pipe-line (1) a withdrawal station (7) for vaporized liquid gas is provided with a controllable release valve (4) which is switched by means of a temperature sensor (2) and a control unit (3) connected thereto, characterised in that the temperature sensor (2) is arranged in the liquid gas pipe-line (1) and the withdrawal station (7) for vaporized liquid gas is arranged between the temperature sensor (2) and the liquid gas valve (5) of the user.

Description

Die Erfindung betrifft eine Vorrichtung zur Sicherstellung der Kälteversorgung eines Kälteverbrauchers, bei der Flüssiggas aus einem Vorratsbehälter über eine Zuleitung mit einem zwischengeschalteten Flüssiggasventil einer Flüssiggasentnahmevorrichtung zugeführt wird.The invention relates to a device for ensuring the cooling supply of a cooling consumer, in which liquid gas is supplied from a storage container via a feed line with an intermediate liquid gas valve to a liquid gas extraction device.

Die permanente Kälteversorgung eines Kälteverbrauchers ist in den verschiedensten technischen Arbeitsgebieten von Relevanz. Vorrichtungen zur Kälteversorgung finden überall dort Anwendung, wo Gegenstände oder Stoffe schnell auf tiefe Temperaturen abgekühlt werden sollen. Bei chargenweisen Kühl- und Frostprozessen mit Flüssiggas wird das verwendete Flüssiggas, z.B. flüssiger Stickstoff, über wärmeisolierte Zuleitungen zum Verbrauchsort transportiert und nach öffnung eines Flüssiggasventils dem Verbraucher zugeführt.The permanent supply of cooling to a cooling consumer is relevant in a wide variety of technical fields. Devices for cooling supply are used wherever objects or substances are to be quickly cooled to low temperatures. In batch cooling and frost processes with liquefied petroleum gas, the liquefied gas used, e.g. liquid nitrogen, transported to the place of consumption via heat-insulated supply lines and supplied to the consumer after opening a liquid gas valve.

Bei Unterbrechung des Kühlprozesses erwärmt sich jedoch das Flüssiggas in der Zuleitung zur Flüssiggasentnahmevorrichtung und geht in die gasförmige Phase über. Beim erneuten(Kühlvorgang ergeben sich somit je nach Dauer der Unterbrechung verschieden lange Kühlausfälle, da zunächst nur wärmeres, verdampftes Flüssiggas aus der Flüssiggasentnahmevorrichtung strömt. Bei kurzzeitigen Kühlprozessen führt dies zu großen Regelproblemen. Um diese Nachteile der Tot- zeiten zu beseitigen, wurde eine Kalthaltevorrichtung entwickelt, die in der DE-PS 26 47 961 beschrieben ist.If the cooling process is interrupted, however, the liquid gas in the feed line to the liquid gas extraction device heats up and changes into the gaseous phase. Upon renewed (cooling process, depending on the duration the interruption of cooling failures of different lengths, since initially only warmer, vaporized liquid gas flows out of the liquid gas extraction device. With short-term cooling processes, this leads to major control problems. To these disadvantages of the Dead - times to eliminate a cold holding device has been developed which is described in DE-PS 26 47 961st

Gemäß dieser Vorrichtung wird das Flüssiggas unter Druck aus dem Vorratstank einem Phasenabscheider zugeführt, wobei der Flüssigkeitsstand über eine Meßeinrichtung bestimmt wird und über eine Steuereinheit mit einem Regelventil zum Ablassen der entstehenden Dämpfe des Flüssiggases verbunden ist. Flüssiger Stickstoff kann blasenfrei am Boden des Phasenabscheiders entnommen werden. Für den Phasenabscheider zur Trennung von Gas-undFlüssigphase ist aber ein separater isolierter Auffangbehälter notwendig. Somit muß mehr Platz für den Einbau dieser Vorrichtung aufgewendet werden.According to this device, the liquid gas is fed under pressure from the storage tank to a phase separator, the liquid level being determined via a measuring device and being connected via a control unit to a control valve for discharging the resulting vapors of the liquid gas. Liquid nitrogen can be drawn from the bottom of the phase separator without bubbles. However, a separate insulated collecting container is necessary for the phase separator for separating gas and liquid phases. Thus, more space must be used to install this device.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Vorrichtung der eingangs beschriebenen Art zur- Kälteversorgung eines Kälteverbrauchers zu entwickeln, mit der ohne aufwendige und teure Konstruktion sichergestellt werden kann, daß das flüssige Kältemittel ständig, insbesondere auch nach Entnahmepausen am Ende einer Flüssiggaszuleitung an der Flüssiggasentnahmevorrichtung entnommen werden kann.The invention is therefore based on the object of developing a device of the type described above for the cooling supply of a refrigeration consumer, with which it can be ensured without complex and expensive construction that the liquid refrigerant is constantly present, in particular even after withdrawal breaks at the end of a liquefied gas supply line at the liquefied petroleum gas sampling device can be removed.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß in der Flüssiggasleitung ein Temperaturfühler sowie eine Entnahmestelle für verdampftes Flüssiggas angeordnet sind, die mit einem Gasabblasventil ausgestattet ist, wobei der Temperaturfühler mit dem Gasabblasventil über einen Grenzwertgeber in Verbindung steht.This object is achieved in that a temperature sensor and a tapping point for vaporized liquid gas are arranged in the liquid gas line, which with a gas blow-off valve is equipped, the temperature sensor being connected to the gas blow-off valve via a limit indicator.

Mit dieser Anordnung können ohne großen konstruktiven Aufwand Kühlprozesse, insbesondere solche, die chargenweise ablaufen, einwandfrei geregelt werden. Die erfindungsgemäße Vorrichtung bewirkt, daß bei Kühlbeginn unabhängig von der Dauer der Unterbrechung des Kühlprozesses am Entnahmeventil des Kälteverbrauchers flüssiges Kaltgas vorliegt. Totzeiten nach Kühlpausen können somit vermieden werden. Die kompakte Bauweise der erfindungsgemäßen Vorrichtung bringt den Vorteil mit sich, daß im Gegensatz zum Phasenabscheider die Vorrichtung nur geringen Platzbedarf hat.With this arrangement, cooling processes, in particular those that run in batches, can be controlled perfectly without great design effort. The device according to the invention has the effect that, at the start of cooling, liquid cold gas is present at the extraction valve of the cooling consumer, regardless of the duration of the interruption of the cooling process. Dead times after cooling breaks can thus be avoided. The compact design of the device according to the invention has the advantage that, in contrast to the phase separator, the device takes up little space.

Vorteilhaft ergibt sich durch die erfindungsgemäße Vorrichtung folgende Arbeitsweise: Das flüssige Kältemittel fließt nach öffnung des Flüssiggasentnähmeventil-s aus dem Vorratsbehälter über die Hauptleitung zum Kälteverbraucher.The device according to the invention advantageously results in the following mode of operation: The liquid refrigerant flows from the storage container via the main line to the refrigeration consumer after the liquefied gas extraction valve has been opened.

Bei einer Entnahmepause schließt dieses Ventil. Da aber für den nächsten E-ntnahmezyklus am Ende der Zuleitung am Entnahmeventil blasenfreies Flüssiggas benötigt wird, müssen die durch Erwärmung des flüssigen Kältemittels entstehenden Dämpfe aus der Zuleitung abgezogen werden.This valve closes during a pause in removal. However, since bubble-free liquid gas is required for the next take-off cycle at the end of the supply line at the supply valve, the vapors generated by heating the liquid refrigerant must be removed from the supply line.

Ein Temperaturfühler überwacht die Temperatur des Flüssiggases und mißt den Temperaturunterschied zwischen Flüssigphase und Gasphase des Kältemittels,A temperature sensor monitors the temperature of the liquid gas and measures the temperature difference between the liquid phase and the gas phase of the refrigerant,

Die gemessenen Werte werden an einen Grenzwertschalter weitergegeben, der dadurch ein Gasabblasventil, das in der Gasentnahmeleitung eingebaut ist, steuert. Bei Erhöhung der Temperatur, also bei Übergang in die Gasphase wird das Gasabblasventil geöffnet, das in einer vorteilhaften Variante des erfindungsgemäßen Vorrichtung ein Tieftemperaturmagnetventil ist. Uber eine Entnahmeleitung für die gasförmige Phase des Flüssiggases, die in einer vorteilhaften Variante dieser Vorrichtung zwischen Temperaturfühler und Flüssiggasentnahmeventil angeordnet ist, wird so lange Gas abgelassen, bis der Temperaturfühler wieder von Flüssiggas umspült wird. Dadurch wird der Temperaturfühler gekühlt und der dazugehörige Grenzwertschalter gibt ein Signal zum Schließen des Ventils.The measured values are passed on to a limit switch, which thereby controls a gas blow-off valve that is installed in the gas extraction line. By increasing the temperature, ie at the transition into the gas phase, the G opens asabblasventil that in an advantageous variant of the invention Device is a low temperature solenoid valve. Gas is discharged via a removal line for the gaseous phase of the liquid gas, which is arranged between the temperature sensor and the liquid gas extraction valve in an advantageous variant of this device, until the temperature sensor is again flushed with liquid gas. This cools the temperature sensor and the associated limit switch gives a signal to close the valve.

Das ausströmende gasförmige Kältemittel kann ins Freie abgegeben oder über einen Kondensator zurück zum Vorratstank geführt werden. Wird über den Temperaturfühler das Signal zum Schließen des Ventils gegeben, ist gewährleistet, daß am Entnahmeventil nur flüssiges Kältemittel ansteht.The escaping gaseous refrigerant can be released outdoors or returned to the storage tank via a condenser. If the signal to close the valve is given via the temperature sensor, it is ensured that only liquid refrigerant is present at the sampling valve.

Im folgenden werden weitere Details der Erfindung anhand der in der Figur wiedergegebenen schematischen Darstellung eines Ausführungsbeispiels beschrieben:

  • Das flüssige Kältemittel kommt über eine Zuleitung 1 aus einem (hier nicht gezeichneten) Vorratsbehälter und strömt über ein Flüssiggasentnahmeventil 5 zu einem Kälteverbraucher 6. Das Flüssiggasentnahmeventil 5 kann z.B. ein Tieftemperaturmagnetventil sein, das vom Verbraucher gesteuert wird. In einer Kühlpause ist dieses Ventil geschlossen und die Temperatur des Kältemittels wird von einem Temperaturfühler 2 kontrolliert. Diese Werte werden an einen Grenzwertschalter 3 weitergegeben. Bei Erwärmung durch Gasansammlung gibt der Grenzwertschalter 3 einem Gasabblasventil 4 ein Signal zum öffnen und die entstandenen Dämpfe werden über eine Entnahmeleitung 7 so lange abgeblasen, bis der Temperaturfühler 2 wieder von Flüssiggas umspült und dadurch gekühlt wird.
Further details of the invention are described below with reference to the schematic representation of an exemplary embodiment shown in the figure:
  • The liquid refrigerant comes via a feed line 1 from a storage container (not shown here) and flows via a liquid gas extraction valve 5 to a refrigeration consumer 6. The liquid gas extraction valve 5 can be, for example, a low-temperature solenoid valve that is controlled by the consumer. During a cooling break, this valve is closed and the temperature of the refrigerant is controlled by a temperature sensor 2. These values are passed on to a limit switch 3. When heating due to gas accumulation, the limit switch 3 gives a gas blow-off valve 4 a signal to open and the vapors formed are blown off via a removal line 7 until the temperature sensor 2 is again flushed with liquid gas and thereby cooled.

Mit Vorzug wird die erfindungsgemäße Vorrichtung bei chargenweisen Kühl- und Frostprozessen in Kuttern und Mischern sowie bei der Herstellung oder Behandlung von Milchpulver, Textilien, Kunststoff-Folien, Schlauchseelen, Vulkanfiber etc. verwendet.The device according to the invention is preferably used in batch-wise cooling and frost processes in cutters and mixers as well as in the production or treatment of milk powder, textiles, plastic films, tubular liners, volcanic fibers, etc.

Claims (3)

1. Vorrichtung zur Sicherstellung der Kälteversorgung eines Kälteverbrauchers, bei der Flüssiggas aus einem Vorratsbehälter über eine Zuleitung mit einem zwischengeschalteten Flüssiggasventil einer Flüssiggasentnahmevorrichtung zugeführt wird, dadurch gekennzeichnet, daß in der Flüssiggasleitung (1) ein Temperaturfühler (2) sowie eine Entnahmestelle (7) für verdampftes Flüssiggas angeordnet sind, die mit einem Gasabblasventil (4) ausgestattet ist, wobei der Temperaturfühler (2) mit dem Gasabblasventil (4) über einen Grenzwertgeber (3) in Verbindung steht.1. A device for ensuring the cooling supply of a refrigeration consumer, in which liquefied petroleum gas is supplied from a storage container via a feed line with an intermediate liquefied gas valve to a liquefied gas extraction device, characterized in that a temperature sensor (2) and a removal point (7) for evaporated liquid gas are arranged, which is equipped with a gas blow-off valve (4), the temperature sensor (2) being connected to the gas blow-off valve (4) via a limit indicator (3). 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Gasabblasventil (4) ein Magnetventil ist.2. Device according to claim 1, characterized in that the gas blow-off valve (4) is a solenoid valve. 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Entnahmestelle (7) zwischen dem Temperaturfühler (2) und dem Flüssiggasventil (5) liegt.3. Apparatus according to claim 1 or 2, characterized in that the removal point (7) between the temperature sensor (2) and the liquid gas valve (5).
EP87105202A 1986-04-26 1987-04-08 Device for securing the supply of cold to a user of cold Expired - Lifetime EP0243746B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87105202T ATE55826T1 (en) 1986-04-26 1987-04-08 DEVICE TO ENSURE THE COOLING SUPPLY OF A COOLING CONSUMER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3614287 1986-04-26
DE19863614287 DE3614287A1 (en) 1986-04-26 1986-04-26 DEVICE FOR SECURING THE COLD SUPPLY OF A COLD CONSUMER

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EP0243746A1 true EP0243746A1 (en) 1987-11-04
EP0243746B1 EP0243746B1 (en) 1990-08-22

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EP87105202A Expired - Lifetime EP0243746B1 (en) 1986-04-26 1987-04-08 Device for securing the supply of cold to a user of cold

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AT (1) ATE55826T1 (en)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0561077A1 (en) * 1992-02-05 1993-09-22 Oxford Magnet Technology Limited Improvements in or relating to helium topping-up apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3555483A (en) * 1968-09-03 1971-01-12 California Inst Of Techn Cryogenic liquid sensor
FR2500908A1 (en) * 1981-03-02 1982-09-03 Europ Agence Spatiale CRYOGENIC INSTALLATION OPERATING IN THE ABSENCE OF GRAVITY, IN PARTICULAR FOR SPACE MISSIONS

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3555483A (en) * 1968-09-03 1971-01-12 California Inst Of Techn Cryogenic liquid sensor
FR2500908A1 (en) * 1981-03-02 1982-09-03 Europ Agence Spatiale CRYOGENIC INSTALLATION OPERATING IN THE ABSENCE OF GRAVITY, IN PARTICULAR FOR SPACE MISSIONS

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 7, Nr. 25 (M-190)[1170], 2. Februar 1983; & JP-A-57 179 499 (TOKYO SHIBAURA DENKI K.K.) 05-11-1982 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0561077A1 (en) * 1992-02-05 1993-09-22 Oxford Magnet Technology Limited Improvements in or relating to helium topping-up apparatus

Also Published As

Publication number Publication date
ATE55826T1 (en) 1990-09-15
DE3614287A1 (en) 1987-10-29
EP0243746B1 (en) 1990-08-22
DE3764392D1 (en) 1990-09-27

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