EP0271031B1 - Dosing device for low-boiling liquefied gases - Google Patents
Dosing device for low-boiling liquefied gases Download PDFInfo
- Publication number
- EP0271031B1 EP0271031B1 EP87117999A EP87117999A EP0271031B1 EP 0271031 B1 EP0271031 B1 EP 0271031B1 EP 87117999 A EP87117999 A EP 87117999A EP 87117999 A EP87117999 A EP 87117999A EP 0271031 B1 EP0271031 B1 EP 0271031B1
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- Prior art keywords
- container
- gas
- fleece
- outlet opening
- liquid
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- Legal status (The legal status 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 status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
- B65B31/006—Adding fluids for preventing deformation of filled and closed containers or wrappers
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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
- F17C13/028—Special adaptations of indicating, measuring, or monitoring equipment having the volume as the parameter
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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
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0634—Materials for walls or layers thereof
- F17C2203/0636—Metals
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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
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0634—Materials for walls or layers thereof
- F17C2203/0658—Synthetics
- F17C2203/066—Plastics
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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
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
- F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
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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
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/06—Controlling or regulating of parameters as output values
- F17C2250/0605—Parameters
- F17C2250/0621—Volume
Definitions
- the invention relates to a device for metering a low-boiling liquefied gas, which is arranged at an outlet opening of a cold-insulated container.
- Low-boiling liquefied gases are usually stored in cold-insulated containers and can be removed via an outlet opening.
- small amounts of low-boiling liquefied gases are very difficult to dose, because the gas generated at the outlet opening repeatedly interrupts the continuously flowing liquid flow. Therefore, complex devices have been developed to achieve a continuous liquid gas flow when metering small amounts of liquefied gases.
- a device for metering small amounts of a low-boiling liquefied gas in which the liquefied gas is in a container which is surrounded by a second container, that there is a space between the containers.
- the liquid gas can be removed from the container via an outlet opening.
- Cold gas flows from the inside into the outer container and cools the entire device so deep that the liquid gas in the inner container is supplied with as little heat as possible from the outside.
- the cold gas leaves the container via a gas outlet opening in the vicinity of the outlet opening for the liquid gas so that it surrounds the liquid gas flowing out.
- a gas cushion under increased pressure is built up, the increased pressure of the gas cushion corresponding at least to the total pressure prevailing in the vicinity of the outlet opening.
- a device for delivering an uninterrupted jet of a cryogenic liquid which has a pressure regulating device containing the cryogenic liquid with an outlet line and a degassing device arranged downstream.
- the degassing device causes free liquid to leave the device, while cold gas is discharged elsewhere via the degassing device. This creates an uninterrupted jet of the cryogenic liquid.
- the object of the invention is therefore to design a device for metering low-boiling liquefied gases, which is arranged at an outlet opening of a cold-insulated container, so that a laminar liquid gas jet can be removed from the device without considerable outlay on equipment.
- This object is achieved in that a nonwoven made of natural material, plastic or metal connects to the outlet opening of the container.
- the device according to the invention consists of a cold-insulated, preferably vacuum-insulated container for low-boiling liquefied gas. At the lower end of the container there is an outlet opening for the liquid gas, which is provided with the nonwoven according to the invention made of natural material, plastic or metal.
- the container is filled with a low-boiling liquefied gas, in particular liquid nitrogen.
- the liquid gas is supplied to the plastic or fleece via the outlet opening and leaves the device in a laminar jet.
- the low-boiling liquefied gas in the container passes through the outlet opening into the fleece.
- a separation of the liquid and gas phases takes place in the fleece, so that a laminar flow of liquid gas is released vertically downwards from the fleece, while cold gas is discharged laterally from the plastic or metal fleece.
- the cold gas does not interfere with the laminar liquid gas flow, so that fine metering of even small amounts of liquid gas is possible.
- the fleece is preferably cylindrical and tapered on the side facing away from the outlet opening of the container.
- the fleece is surrounded by a cylindrical, open wall facing away from the outlet opening in such a way that there is a gap between the fleece and the wall of approximately 2 to approximately 30 mm around the fleece.
- a fine regulating valve is expediently sunk in the liquefied gas at the bottom of the container and is connected to the outlet opening and to a regulating device arranged outside the container. This enables a continuous change in the quantity of the liquefied gas exiting through the outlet opening and thus a precise, continuous metering of the laminar liquid gas flow discharged from the fleece. Since the fine control valve is buried in the liquefied gas, the valve is prevented from icing up.
- the fine control valve can be controlled by hand, for example, using a simple rod which is connected to the valve and protrudes from the container.
- control via a servomotor which is connected to the fine regulating valve, proves to be particularly expedient.
- automation of the device is possible. For example, a predetermined amount of liquefied petroleum gas can be automatically metered into beverage cans, food packs, etc., which are guided beneath the device.
- the device according to the invention has the advantage over conventional metering devices for liquefied gases that precise metering of even small amounts of low-boiling liquefied gases is possible with only a small outlay on equipment. Due to the perfect separation of the liquid and gas phases in the nonwoven according to the invention, a laminar, easily metered liquid gas jet is generated. The fine regulating valve sunk in the liquid gas enables a continuous regulation of the liquid gas volume flow in the desired range.
- the device according to the invention is suitable for metering low-boiling liquefied gases, in particular liquid nitrogen.
- Liquid nitrogen is often used, especially in the food industry. Nitrogen is often used as an inert gas in food packaging. Frequently, the liquefied gas should also generate a certain internal pressure after the packaging has been closed in order to increase the mechanical resistance of the packaging, for example when stacking one on top of the other.
- the device according to the invention even small amounts of the liquid gas, for example liquid nitrogen, can be precisely metered in, for example in food packaging.
- predetermined amounts of liquid nitrogen can be automatically metered in, for example, in beverage cans on filling machines at high work speeds.
- the device according to the invention can also be used advantageously to solve cooling problems in which only small amounts of liquefied gas are required.
- the figure shows a longitudinal section through a device according to the invention.
- the device shown in the figure consists of a vacuum-insulated container (1) for holding the low-boiling liquefied gas (2).
- the container (1) is open at the top, so that fresh liquid gas (3) can be supplied at the top and exhaust gas (4) can escape.
- the liquid gas level (5) can be kept constant by controlling the liquid gas supply by means of a conventional automatic control system.
- the fine regulating valve (6) which has a rigid connection (7) to the regulating device, which is not shown in the figure and is arranged outside the container, is arranged at the bottom of the container (1) and is sunk into the liquid gas (2).
- the fine control valve (6) can also be controlled manually via the rigid connection (7).
- a line (9) for liquid gas which is connected to the fine regulating valve (6), passes through the outlet opening (8) and ends at the fleece (10) made of natural material, plastic or metal.
- the fleece (10) is cylindrical and tapered towards the bottom, so that a thin, laminar liquid gas jet (11) is emitted.
- the cold gas (12) escapes from the side of the fleece.
- the fleece (10) is surrounded by a wall (13) in such a way that there is a gap of approximately 15 mm between the fleece and the wall around the web.
- the cold gas (12) escaping laterally from the fleece is deflected downward in accordance with the arrows (14) and thus surrounds the fleece (10), so that access to atmospheric moisture is avoided and freezing is thus prevented.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Vacuum Packaging (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zum Dosieren eines tiefsiedenden verflüssigten Gases, die an einer Auslauföffnung eines kälteisolierten Behälters angeordnet ist.The invention relates to a device for metering a low-boiling liquefied gas, which is arranged at an outlet opening of a cold-insulated container.
Tiefsiedende verflüssigte Gase werden gewöhnlich in kälteisolierten Behältern gespeichert und können über eine Auslauföffnung entnommen werden. Insbesondere kleine Mengen von tiefsiedenden verflüssigten Gasen lassen sich aber nur sehr schlecht dosieren, weil das an der Auslauföffnung entstehende Gas immer wieder den kontinuierlich laufenden Flüssigkeitsstrom unterbricht. Daher wurden aufwendige Vorrichtungen entwickelt, um einen kontinuierlichen Flüssiggasstrom beim Dosieren von kleinen Mengen verflüssigter Gase zu erzielen.Low-boiling liquefied gases are usually stored in cold-insulated containers and can be removed via an outlet opening. In particular, small amounts of low-boiling liquefied gases are very difficult to dose, because the gas generated at the outlet opening repeatedly interrupts the continuously flowing liquid flow. Therefore, complex devices have been developed to achieve a continuous liquid gas flow when metering small amounts of liquefied gases.
So ist aus der DE-PS 34 02 292 eine Vorrichtung zum Dosieren kleiner Mengen eines tiefsiedenden verflüssigten Gases bekannt, bei der sich das Flüssiggas in einem Behälter befindet, der von einem zweiten Behälter so umgeben ist, daß ein Zwischenraum zwischen den Behältern besteht. Das Flüssiggas kann über eine Auslauföffnung dem Behälter entnommen werden. Kaltes Gas tritt aus dem Inneren in den äußeren Behälter über und kühlt die gesamte Vorrichtung so tief ab, daß dem im inneren Behälter befindlichen Flüssiggas möglichst wenig Wärme von außen zugeführt wird. Das kalte Gas verläßt den Behälter über eine Gasaustrittsöffnung in der Nähe der Auslauföffnung für das Flüssiggas so, daß es das ausströmende Flüssiggas umgibt. Zum Absperren des ausfließenden Flüssiggases wird ein unter erhöhtem Druck stehendes Gaspolster aufgebaut, wobei der erhöhte Druck des Gaspolsters mindestens dem in der Umgebung der Auslauföffnung herrschenden Gesamtdruck entspricht.From DE-PS 34 02 292 a device for metering small amounts of a low-boiling liquefied gas is known, in which the liquefied gas is in a container which is surrounded by a second container, that there is a space between the containers. The liquid gas can be removed from the container via an outlet opening. Cold gas flows from the inside into the outer container and cools the entire device so deep that the liquid gas in the inner container is supplied with as little heat as possible from the outside. The cold gas leaves the container via a gas outlet opening in the vicinity of the outlet opening for the liquid gas so that it surrounds the liquid gas flowing out. To shut off the outflowing liquid gas, a gas cushion under increased pressure is built up, the increased pressure of the gas cushion corresponding at least to the total pressure prevailing in the vicinity of the outlet opening.
Aus der DE-OS 34 19 855 ist ferner eine Vorrichtung zur Abgabe eines ununterbrochenen Strahles einer kryogenen Flüssigkeit bekannt, die über eine die kryogene Flüssigkeit enthaltende Druckreguliereinrichtung mit einer Ausgangsleitung und einer stromabwärts angeordneten Entgasungseinrichtung verfügt. Die Entgasungseinrichtung bewirkt, daß freie Flüssigkeit die Vorrichtung verläßt, während kaltes Gas an anderer Stelle über die Entgasungseinrichtung abgeführt wird. Dadurch entsteht ein ununterbrochener Strahl der kryogenen Flüssigkeit.From DE-OS 34 19 855 a device for delivering an uninterrupted jet of a cryogenic liquid is also known, which has a pressure regulating device containing the cryogenic liquid with an outlet line and a degassing device arranged downstream. The degassing device causes free liquid to leave the device, while cold gas is discharged elsewhere via the degassing device. This creates an uninterrupted jet of the cryogenic liquid.
Aus "Patent Abstracts of Japan, Band 8, Nr. 132 (M-303) [1569], 20. Juni 1984" ist es darüber hinaus bekannt, zur Dosierung eines verflüssigten Gases eine Düse aus porösem Material zu verwenden. Doch mit der dort beschriebenen Vorrichtung ist es nicht möglich, einen fein dosierbaren laminaren Flüssiggasstrahl zu erzeugen. Die zelluläre Struktur des porösen Materials setzt dem Flüssiggas einen hohen Strömungswiderstand entgegen, der durch Druckbeaufschlagung überwunden werden muß. Dadurch entstehen Turbulenzen im porösen Material, die schließlich zum unkontrollierten Verspritzen des Flüssiggases führen.It is also known from "Patent Abstracts of Japan, Volume 8, No. 132 (M-303) [1569], June 20, 1984" to use a nozzle made of porous material for metering a liquefied gas. However, with the device described there, it is not possible to produce a finely dosed laminar liquid gas jet. The cellular structure of the porous material opposes the liquid gas to a high flow resistance due to pressurization must be overcome. This creates turbulence in the porous material, which ultimately leads to the uncontrolled splashing of the liquid gas.
Alle bekannten Vorrichtungen zum Dosieren von verflüssigten Gasen, insbesondere von kleinen Mengen, die einen kontinuierlichen Flüssigkeitsstrom abgeben, sind apparativ sehr aufwendig.All known devices for metering liquefied gases, in particular small amounts, which emit a continuous flow of liquid, are very complex in terms of apparatus.
Aufgabe der Erfindung ist es daher, eine Vorrichtung zum Dosieren von tiefsiedenden verflüssigten Gasen, die an einer Auslauföffnung eines kälteisolierten Behälters angeordnet ist, so auszugestalten, daß ohne erheblichen apparativen Aufwand ein laminarer Flüssiggasstrahl der Vorrichtung entnommen werden kann.The object of the invention is therefore to design a device for metering low-boiling liquefied gases, which is arranged at an outlet opening of a cold-insulated container, so that a laminar liquid gas jet can be removed from the device without considerable outlay on equipment.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß an die Auslauföffnung des Behälters ein Vlies aus Naturstoff, Kunststoff oder Metall anschließt.This object is achieved in that a nonwoven made of natural material, plastic or metal connects to the outlet opening of the container.
Die erfindungsgemäße Vorrichtung besteht aus einem kälteisolierten, vorzugsweise vakuumisolierten Behälter für tiefsiedendes verflüssigtes Gas. Am unteren Ende des Behälters ist eine Auslauföffnung für das Flüssiggas angebracht, die mit dem erfindungsgemäßen Vlies aus Naturstoff, Kunststoff oder Metall versehen ist. Der Behälter ist mit einem tiefsiedenden verflüssigten Gas, insbesondere flüssigen Stickstoff, gefüllt. Das Flüssiggas wird über die Auslauföffnung dem Kunststoff-oder Vlies zugeführt und verläßt die Vorrichtung in einem laminaren Strahl.The device according to the invention consists of a cold-insulated, preferably vacuum-insulated container for low-boiling liquefied gas. At the lower end of the container there is an outlet opening for the liquid gas, which is provided with the nonwoven according to the invention made of natural material, plastic or metal. The container is filled with a low-boiling liquefied gas, in particular liquid nitrogen. The liquid gas is supplied to the plastic or fleece via the outlet opening and leaves the device in a laminar jet.
Das im Behälter befindliche tiefsiedende verflüssigte Gas tritt durch die Auslauföffnung in das Vlies über. In dem Vlies erfolgt eine Separation von Flüssig- und Gasphase, so daß ein laminarer Flüssiggasstrom vom Vlies senkrecht nach unten abgegeben wird, während kaltes Gas vom Kunststoff- oder Metallvlies seitlich abgeführt wird. Das kalte Gas stört also den laminaren Flüssiggasstrom nicht, so daß eine feine Dosierung auch kleiner Mengen an Flüssiggas möglich ist.The low-boiling liquefied gas in the container passes through the outlet opening into the fleece. A separation of the liquid and gas phases takes place in the fleece, so that a laminar flow of liquid gas is released vertically downwards from the fleece, while cold gas is discharged laterally from the plastic or metal fleece. The cold gas does not interfere with the laminar liquid gas flow, so that fine metering of even small amounts of liquid gas is possible.
Vorzugsweise ist das Vlies zylinderförmig und an der der Auslauföffnung des Behälters abgewandten Seite spitz zulaufend ausgebildet.The fleece is preferably cylindrical and tapered on the side facing away from the outlet opening of the container.
Bei dieser Formgebung wird ein laminarer, dünner, nach unten gerichteter Flüssiggasstrahl erzeugt, der sich besonders gut zur Feindosierung kleiner Mengen an Flüssiggas eignet. Das kalte Gas wird von dem zylinderförmigen Vlies, gleichmäßig über die Zylinderoberfläche verteilt, waagrecht abgeführt.With this design, a laminar, thin, downward directed liquid gas jet is generated, which is particularly well suited for the fine metering of small amounts of liquid gas. The cold gas is discharged horizontally from the cylindrical fleece, evenly distributed over the cylinder surface.
In einer besonders vorteilhaften Ausführungsform der erfindungsgemäßen Vorrichtung ist das Vlies von einer zylinderförmigen, an der der Auslauföffnung abgewandten offenen Umwandung so umgeben, daß rings um das Vlies ein Spalt zwischen dem Vlies und der Umwandung von ca. 2 bis ca. 30 mm vorhanden ist. Dadurch wird das vom Vlies abgeführte kalte Gas nach unten abgelenkt, so daß es das Kunststoff- oder Metallvlies und den nach unten austretenden Flüssiggasstrom umgibt. Dies verhindert den Zutritt von Luftfeuchtigkeit zu dem Vlies und damit ein Vereisen.In a particularly advantageous embodiment of the device according to the invention, the fleece is surrounded by a cylindrical, open wall facing away from the outlet opening in such a way that there is a gap between the fleece and the wall of approximately 2 to approximately 30 mm around the fleece. As a result, the cold gas discharged from the fleece is deflected downward, so that it surrounds the plastic or metal fleece and the liquid gas stream emerging downwards. This prevents air moisture from entering the fleece and thus freezing.
Zweckmäßigerweise ist am Boden des Behälters ein Feinregulierventil im verflüssigten Gas versenkt angebracht, das mit der Auslauföffnung und mit einer außerhalb des Behälters angeordneten Reguliereinrichtung verbunden ist. Dies ermöglicht eine stufenlose Mengenänderung des durch die Auslauföffnung austretenden verflüssigten Gases und damit eine präzise, stufenlose Dosierung des vom Vlies abgeführten laminaren Flüssiggasstroms. Da das Feinregulierventil im verflüssigten Gas versenkt ist, wird ein Vereisen des Ventils verhindert. Das Feinregulierventil kann beispielsweise über einen einfachen Stab, der mit dem Ventil verbunden ist und aus dem Behälter herausragt, per Hand gesteuert werden.A fine regulating valve is expediently sunk in the liquefied gas at the bottom of the container and is connected to the outlet opening and to a regulating device arranged outside the container. This enables a continuous change in the quantity of the liquefied gas exiting through the outlet opening and thus a precise, continuous metering of the laminar liquid gas flow discharged from the fleece. Since the fine control valve is buried in the liquefied gas, the valve is prevented from icing up. The fine control valve can be controlled by hand, for example, using a simple rod which is connected to the valve and protrudes from the container.
Als besonders zweckmäßig erweist sich aber eine Steuerung über einen Stellmotor, der mit dem Feinregulierventil verbunden ist. Auf diese Weise ist eine Automatisierung der Vorrichtung möglich. So kann beispielsweis automatisch eine vorher bestimmte Menge Flüssiggas in unterhalb der Vorrichtung vorbeigeführte Getränkedosen, Lebensmittelpackungen usw. eindosiert werden.However, control via a servomotor, which is connected to the fine regulating valve, proves to be particularly expedient. In this way, automation of the device is possible. For example, a predetermined amount of liquefied petroleum gas can be automatically metered into beverage cans, food packs, etc., which are guided beneath the device.
Die erfindungsgemäße Vorrichtung weist gegenüber herkömmlichen Dosiereinrichtungen für verflüssigte Gase den Vorteil auf, daß durch einen nur geringen apparativen Aufwand eine präzise Dosierung auch geringer Mengen tiefsiedender verflüssigter Gase möglich ist. Aufgrund der einwandfreien Separation von Flüssig- und Gasphase in dem erfindungsgemäßen Vlies wird ein laminarer gut dosierbarer Flüssiggasstrahl erzeugt. Durch das im Flüssiggas versenkte Feinregulierventil ist eine stufenlose Regulierung des Flüssiggasvolumenstrom im erwünschten Bereich möglich.The device according to the invention has the advantage over conventional metering devices for liquefied gases that precise metering of even small amounts of low-boiling liquefied gases is possible with only a small outlay on equipment. Due to the perfect separation of the liquid and gas phases in the nonwoven according to the invention, a laminar, easily metered liquid gas jet is generated. The fine regulating valve sunk in the liquid gas enables a continuous regulation of the liquid gas volume flow in the desired range.
Die erfindungsgemäße Vorrichtung eignet sich zum Dosieren von tiefsiedenden verflüssigten Gasen, insbesondere von flüssigem Stickstoff. Besonders in der Lebensmittelindustrie wird flüssiger Stickstoff häufig verwendet. So dient Stickstoff oftmals als Inertgas in Lebensmittelverpackungen. Häufig soll das verflüssigte Gas auch nach dem Verschließen der Verpackung einen bestimmten Innendruck erzeugen, um die mechanische Widerstandsfähigkeit der Verpackung, z.B. beim Übereinanderstapeln, zu erhöhen. Mit der erfindungsgemäßen Vorrichtung können präzise auch geringe Mengen des Flüssiggases, z.B. flüssigen Stickstoffs, beispielsweise in Lebensmittelverpackungen eindosiert werden. Durch die Betätigung des Feinregulierventils mit dem Stellmotor können beispielsweise in Getränkedosen auf Abfüllmaschinen mit großem Arbeitstempo vorher bestimmte Mengen flüssigen Stickstoffs automatisch eindosiert werden.The device according to the invention is suitable for metering low-boiling liquefied gases, in particular liquid nitrogen. Liquid nitrogen is often used, especially in the food industry. Nitrogen is often used as an inert gas in food packaging. Frequently, the liquefied gas should also generate a certain internal pressure after the packaging has been closed in order to increase the mechanical resistance of the packaging, for example when stacking one on top of the other. With the device according to the invention, even small amounts of the liquid gas, for example liquid nitrogen, can be precisely metered in, for example in food packaging. By actuating the fine regulating valve with the servomotor, predetermined amounts of liquid nitrogen can be automatically metered in, for example, in beverage cans on filling machines at high work speeds.
Auch zur Lösung von Kühlproblemen, bei denen gezielt nur geringe Mengen an verflüssigtem Gas benötigt werden, kann die erfindungsgemäße Vorrichtung vorteilhaft eingesetzt werden.The device according to the invention can also be used advantageously to solve cooling problems in which only small amounts of liquefied gas are required.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and will be described in more detail below.
Die Figur zeigt einen Längsschnitt durch eine erfindungsgemäße Vorrichtung.The figure shows a longitudinal section through a device according to the invention.
Die in der Figur dargestellte Vorrichtung besteht aus einem vakuumisolierten Behälter (1) zur Aufnahme des tiefsiedenden verflüssigten Gases (2). Der Behälter (1)ist oben offen, so daß frisches Flüssiggas (3) oben zugeführt werden kann und Abgas (4) entweichen kann. Durch eine übliche Regelautomatik kann der Flüssiggaspegel (5) durch Steuerung der Flüssiggaszufuhr konstant gehalten werden.The device shown in the figure consists of a vacuum-insulated container (1) for holding the low-boiling liquefied gas (2). The container (1) is open at the top, so that fresh liquid gas (3) can be supplied at the top and exhaust gas (4) can escape. The liquid gas level (5) can be kept constant by controlling the liquid gas supply by means of a conventional automatic control system.
Im Flüssiggas (2) versenkt ist am Boden des Behälters (1) das Feinregulierventil (6) angeordnet, das über eine starre Verbindung (7)zu der in der Figur nicht dargestellten, außerhalb des Behälters angeordneten Reguliereinrichtung verfügt. Das Feinregulierventil (6) kann auch per Hand über die starre Verbindung (7) gesteuert werden.The fine regulating valve (6), which has a rigid connection (7) to the regulating device, which is not shown in the figure and is arranged outside the container, is arranged at the bottom of the container (1) and is sunk into the liquid gas (2). The fine control valve (6) can also be controlled manually via the rigid connection (7).
Am unteren Ende des Behälters (1) ist eine Auslauföffnung (8) für das verflüssigte Gas angebracht. Eine Leitung (9) für Flüssiggas, die mit dem Feinregulierventil (6) in Verbindung steht, tritt durch die Auslauföffnung (8) hindurch und endet an dem Vlies (10)aus Naturstoff, Kunststoff oder Metall. Das Vlies (10) ist zylinderförmig und nach unten hin spitz zulaufend ausgebildet, so daß ein dünner, laminarer Flüssiggasstrahl (11)abgegeben wird. Das kalte Gas (12) entweicht aus dem Vlies seitlich.At the lower end of the container (1) there is an outlet opening (8) for the liquefied gas. A line (9) for liquid gas, which is connected to the fine regulating valve (6), passes through the outlet opening (8) and ends at the fleece (10) made of natural material, plastic or metal. The fleece (10) is cylindrical and tapered towards the bottom, so that a thin, laminar liquid gas jet (11) is emitted. The cold gas (12) escapes from the side of the fleece.
Das Vlies (10) ist von einer Umwandung (13) so umgeben, daß rings um das Vlies ein Spalt von ca. 15 mm zwischen dem Vlies unter Umwandung vorhanden ist. Dadurch wird das aus dem Vlies seitlich entweichende kalte Gas (12) nach unten entsprechend den Pfeilen (14) abgelenkt und umgibt so das Vlies (10), so daß ein Zutritt von Luftfeuchtigkeit vermieden und damit ein Einfrieren verhindert wird.The fleece (10) is surrounded by a wall (13) in such a way that there is a gap of approximately 15 mm between the fleece and the wall around the web. As a result, the cold gas (12) escaping laterally from the fleece is deflected downward in accordance with the arrows (14) and thus surrounds the fleece (10), so that access to atmospheric moisture is avoided and freezing is thus prevented.
Claims (5)
- A device for dispensing a low-boiling, liquified gas which device is arranged at an outlet opening of a low temperature insulated container, characterised in that a fleece component (10) made of natural material, synthetic material or metal adjoins the outlet opening (8) of the container (1).
- A device as claimed in Claim 1, characterised in that the fleece component (10) is cylindrical and tapers at the end facing away from the outlet opening (8) of the container (1).
- A device as claimed in Claim 1 or 2, characterised in that the fleece component (10) is surrounded by a cylindrical casing (13) open at the end facing away from the outlet opening (8), in such manner that a gap of approximately 2 to approximately 30 mm is present between the fleece component (10) and the casing (13).
- A device as claimed in one of Claims 1 to 3, characterised in that a fine regulating valve (6) is arranged on the bottom of the container (8) immersed in the liquified gas, which valve (6) is connected to the outlet opening (8) and to a regulating device arranged outside the container.
- A device as claimed in Claim 4, characterised in that the regulating device is a servomotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT87117999T ATE67573T1 (en) | 1986-12-10 | 1987-12-05 | DEVICE FOR DOSING LOW-BOILING LIQUEFIED GASES. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19863642199 DE3642199A1 (en) | 1986-12-10 | 1986-12-10 | DEVICE FOR DOSING LOW-BOILED LIQUID GASES |
| DE3642199 | 1986-12-10 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0271031A2 EP0271031A2 (en) | 1988-06-15 |
| EP0271031A3 EP0271031A3 (en) | 1989-05-31 |
| EP0271031B1 true EP0271031B1 (en) | 1991-09-18 |
Family
ID=6315898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87117999A Expired - Lifetime EP0271031B1 (en) | 1986-12-10 | 1987-12-05 | Dosing device for low-boiling liquefied gases |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4796434A (en) |
| EP (1) | EP0271031B1 (en) |
| AT (1) | ATE67573T1 (en) |
| BR (1) | BR8706680A (en) |
| DE (2) | DE3642199A1 (en) |
| ES (1) | ES2026513T3 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2696152B1 (en) * | 1992-09-29 | 1994-10-28 | Air Liquide | Method and device for dispensing doses of liquid, in particular liquefied gas. |
| US5513961A (en) * | 1994-08-09 | 1996-05-07 | Chicago Bridge & Iron Technical Services Company | Method and apparatus for improving pump net positive suction head |
| GB9419055D0 (en) * | 1994-09-21 | 1994-11-09 | Boc Group Plc | Liquid dispenser flow calming |
| US5743096A (en) * | 1996-04-11 | 1998-04-28 | Vacuum Barrier Corporation | Controlled dosing of liquid cryogen |
| US5868003A (en) * | 1997-07-14 | 1999-02-09 | Praxair Technology, Inc. | Apparatus for producing fine snow particles from a flow liquid carbon dioxide |
| US12031680B1 (en) | 2024-01-22 | 2024-07-09 | Vacuum Barrier Corporation | Controlled dosing of liquid cryogen |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB979764A (en) * | 1960-06-09 | 1965-01-06 | Garrett Corp | Discharging liquid from containers by gaseous pressure |
| US3206939A (en) * | 1962-12-26 | 1965-09-21 | Union Carbide Corp | Cryogenic fluid transfer system |
| US3295563A (en) * | 1963-12-27 | 1967-01-03 | Gen Dynamics Corp | Method and apparatus for handling cryogenic liquids |
| FR2379018A1 (en) * | 1976-12-23 | 1978-08-25 | Air Liquide | CRYOGENIC PROCESS AND PLANT FOR DISTRIBUTION OF GAS UNDER PRESSURE |
| DE2923078C2 (en) * | 1979-06-07 | 1983-12-15 | Messer Griesheim Gmbh, 6000 Frankfurt | Device for separating the gas that evaporates when conveying low-boiling liquefied gases |
| JPS58142098A (en) * | 1982-02-17 | 1983-08-23 | Suntory Ltd | Flow-down device for liquefied inert gas |
| JPS58184395A (en) * | 1982-04-22 | 1983-10-27 | Teisan Kk | Apparatus for flowing-out low-temperature liquefied gas in constant amount |
| JPS5934098A (en) * | 1982-08-20 | 1984-02-24 | Toyo Seikan Kaisha Ltd | Liquefied-gas dripping nozzle |
| DE3402292C2 (en) * | 1984-01-24 | 1986-01-23 | Messer Griesheim Gmbh, 6000 Frankfurt | Method and device for dosing small amounts of a low-boiling, liquefied gas |
| US4566283A (en) * | 1984-08-30 | 1986-01-28 | Nicolet Instrument Corporation | Low temperature device for cooling small samples |
-
1986
- 1986-12-10 DE DE19863642199 patent/DE3642199A1/en not_active Withdrawn
-
1987
- 1987-11-25 US US07/126,217 patent/US4796434A/en not_active Expired - Fee Related
- 1987-12-05 DE DE8787117999T patent/DE3773143D1/en not_active Expired - Fee Related
- 1987-12-05 ES ES198787117999T patent/ES2026513T3/en not_active Expired - Lifetime
- 1987-12-05 AT AT87117999T patent/ATE67573T1/en not_active IP Right Cessation
- 1987-12-05 EP EP87117999A patent/EP0271031B1/en not_active Expired - Lifetime
- 1987-12-09 BR BR8706680A patent/BR8706680A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0271031A2 (en) | 1988-06-15 |
| BR8706680A (en) | 1988-07-19 |
| DE3773143D1 (en) | 1991-10-24 |
| DE3642199A1 (en) | 1988-06-30 |
| EP0271031A3 (en) | 1989-05-31 |
| US4796434A (en) | 1989-01-10 |
| ATE67573T1 (en) | 1991-10-15 |
| ES2026513T3 (en) | 1992-05-01 |
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