EP1327837B1 - Automatisches Kühlmediumventil - Google Patents

Automatisches Kühlmediumventil Download PDF

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Publication number
EP1327837B1
EP1327837B1 EP02445185A EP02445185A EP1327837B1 EP 1327837 B1 EP1327837 B1 EP 1327837B1 EP 02445185 A EP02445185 A EP 02445185A EP 02445185 A EP02445185 A EP 02445185A EP 1327837 B1 EP1327837 B1 EP 1327837B1
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EP
European Patent Office
Prior art keywords
liquid
valve
valve device
cooling
chamber
Prior art date
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.)
Expired - Lifetime
Application number
EP02445185A
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English (en)
French (fr)
Other versions
EP1327837A3 (de
EP1327837A2 (de
Inventor
Benny Andersson
Xavier Hue
Anna Szel
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.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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Filing date
Publication date
Application filed by Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Publication of EP1327837A2 publication Critical patent/EP1327837A2/de
Publication of EP1327837A3 publication Critical patent/EP1327837A3/de
Application granted granted Critical
Publication of EP1327837B1 publication Critical patent/EP1327837B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/06—Control arrangements therefor
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2515—Flow valves

Definitions

  • the present invention relates a valve device for a cooling agent circuit, which circuit comprises a closed pipe loop with cooling agent and which pipe loop at least partly passes through a first liquid.
  • Some food products need to be stored at a specific temperature that differs from the normal temperature of a cooling cabinet, such as a refrigerator cabinet. Meat for example should be stored at approximately zero degrees Celsius, which storage leads to a considerably extended storage time for the food product without needing to freeze it.
  • US5212962 discloses one embodiment of a cooling device for a refrigerator cabinet.
  • the document describes a device in which air is circulated in a lower compartment in order to achieve an even, low temperature for vegetables.
  • a fan brings the air to circulation and two sensors detect the temperature in each space. If the temperature in the lower space exceeds a certain value the fan starts rotating and the circulating air brings the temperature down.
  • US4539819 discloses a similar cooling device. Air circulates in a space below a storage box intended to store meat. A fan unit regulates the airflow and controls that the temperature in the box is kept at an adequate temperature.
  • US-A-2 657 861 discloses a refrigeration controlling valve for a cooling agent circuit according to the preamble of claim 1.
  • the cooling devices can only be used in refrigerators with an air circulation system. Moreover, the devices are depended on the functionality of the fan unit and the sensors. If the system should fail the temperature will change rapidly in the cooling device. Furthermore, it is difficult to achieve a temperature for example around zero degrees Celsius for meat, which is necessary in order to increase the storage time. Another problem occurring is that such cooling devices require a cabinet adapted for the device.
  • the cooling device which is detachably arranged against the cooling surface inside a compressor-cooling refrigerator, comprises a cooling agent circuit comprising a closed pipe loop.
  • a cabinet in the device encloses a volume, inside which food products can be stored. At least one of the walls enclosing the volume is at least partly filled with a liquid with a well-defined freezing point.
  • Water is a suitable liquid for a device intended to achieve a zero degree storage volume.
  • a first part of the pipe loop extends through the liquid and a second part extends in contact with the cooling surface of a refrigerator. The contact with the surface brings cooling energy to the cooling agent which makes it circulate in the cooling agent circuit.
  • a valve manually operated by the user, regulates the flow of agent. The valve is adjusted based on information about the temperature in different areas and settings on the refrigerator thermostat, which adjustments stabilizes the temperature inside the volume.
  • the object of the present invention is therefore to achieve a valve for a cooling device, which stabilizes the temperature of the cooling device volume at the specific temperature.
  • the valve should also be easy to produce, cheap and be able to attach to a cooling agent system as the ones used in the cooling device.
  • the valve should be reliable and consist of simple, standards components. It shall moreover be able to handle the pressure and temperature conditions that may occur.
  • Fig. 1 shows a valve device according to the present invention with a cross section of the valve house.
  • Fig. 2 shows the valve device according to fig. 1 with a cross section also comprising the valve tube of the device with accompanying attachments.
  • Fig. 3 shows a cross section of the valve tube according to fig. 1 -2.
  • Fig 4 shows a pespective view a a cooling device at which the valve device according to claim 1 can be attached.
  • the valve device 1 is in use attached to a cooling agent circuit 30 (fig. 4) at the two ends 2,3 of the closed pipe loop.
  • fig. 2 it is shown how the circuit is attached to a mouthpiece 4 as part of the valve device.
  • the mouthpiece is shown in detail in fig. 3.
  • the mouthpiece and the connections are preferably made in one piece in a metal that is chemically stable in contact with the metal of pipe of the cooling circuit.
  • the connections are adapted to the diameter of the pipe ends 2,3, normally 6,5 millimetres, in order for the ends to fit outside the mouthpiece connections 6,7. It is necessary that the fit is as tight as possible.
  • the fit may be made by gluing welding.
  • passage 8,9 in each one of the mouthpiece 4 connections 6,7.
  • the passages extend in parallel with each other in the longitudinal direction of the connections, from the outer ends of the connections into the mouthpiece without coming into contact with each other.
  • the inner diameter of the passages is in this embodiment larger inside the mouthpiece connections. This is not necessary.
  • Valve passages 10,11 connect the inner side with the passages 8,9 with openings on the envelope surface of the mouthpiece. In fig. 3 there are two valve passages 10,11 per side but it is of course possible to have more such passages.
  • FIG. 2 the mouthpiece 4 is shown attached by the connections 10,11 and the pipe ends 2,3 to the cooling agent circuit 30.
  • the connections 6,7 are visible.
  • a valve tube 12 is mounted around the mouthpiece.
  • FIG. 1 the outside of the valve tube is shown and fig. 2 shows the cross section of the tube.
  • Fig. 2 also shows the cross section of two attachments 13,14 that seals the ends of the tube against the pipe ends 2,3 in order to achieve a sealed chamber 23 between the tube and the mouthpiece. Since the inner diameter of the tube, which corresponds to the outer diameter of the circuit pipe 2,3, is larger than the outer diameter of the mouthpiece 4 the chamber is formed. The chamber stretches all the way around the mouthpiece.
  • the valve tube is formed in an elastic material that should be chemically and mechanically stable in connection with other materials or liquids. Its shape is circular in order to fit the pipe ends of the cooling agent circuit.
  • the valve house 15 encloses the mouthpiece 4 and the valve tube 12.
  • the task of the valve house is essential for the valve device.
  • the house is in the embodiment circular and made in metal, which results in that the house behaves non-elastic when exposed to high pressure.
  • the house must be tight in high-pressure situations, whereby the contact surfaces 16,17 between the house and the circuit pipes 2,3 are preferably joined together by gluing or welding.
  • an end part 18 is finally mounted on the house.
  • a first chamber 19 formed between the valve house 15, the valve tube 12 and the circuit pipes 2,3 is filled with two liquids 20,21.
  • the liquids should have different properties.
  • a first one of the liquids 20 should have a freezing point similar with the freezing point of the liquid in the cooling device that the valve device 1 intends to be used together with.
  • the cooling device will be further described down below. No organic material should be able to grow inside the liquid and the liquid should not be human or environmental unfriendly.
  • the first liquid 20 fills the lower part of the first chamber up to a surface 22.
  • the liquid should not surround any of the valve passages 11.
  • a second liquid 21 fills the rest of the first chamber and surrounds the whole valve mouthpiece 4 and one of the connections 6,7.
  • the second liquid should not be mixable with the first liquid.
  • the second liquid should have a density that essentially diverges from the density of the first liquid and have a freezing point at least lower than 20 degrees Celsius.
  • a suitable second liquid could be silicon oil.
  • the valve device 1 should fulfil the following requirement:
  • the valve house 15 should be able to cope the pressure rise when the first liquid 20 expands (the second liquid has a very low freezing point), which corresponds to the fact that the liquid freezes to ice. Water for example expands 8% when it freezes.
  • the volume of the sealed chamber 23 should be smaller that the increasing volume of the freezing liquid 20.
  • the density of the second liquid 21 should further on essentially differ from the density of the first liquid when the first liquid has expanded to its full range.
  • a little air bubble may be arranged together with the liquids in the first chamber in order to avoid a critical pressure increase in the valve house when the first liquid freezes.
  • An alternative to the bubble is to design the valve house in an elastic material.
  • the cooling agent circuit 30 comprises a closed pipe loop.
  • a first part 31 of the pipe loop passes through a circuit liquid inside the wall side 32, which liquid has properties that corresponds to the properties of the first liquid 20 of the valve device. More walls 36 cooperate to enclose a volume 35 that is cooled by the circuit liquid.
  • a second part 33 of the pipe loop is arranged at a cooling surface (not shown), whereby a low thermal resistance is achieved between the pipe and the surface. The cooling surface thereby transfers cooling energy that brings the cooling agent in the closed pipe loop to circulate.
  • a second valve 34 is attached to the cooling agent circuit that only allows the agent to flow in one direction.
  • the agent will flow from the lower pipe end 3 towards the passage 9.
  • the agent will then moves via the valve passage 11, the sealed chamber 23 through the valve passage 10.
  • the cooling agent is thereafter forced through the passage 8 into the closed pipe loop through the pipe end 2.
  • the flowing, circulating cooling agent will transfer cooling energy that cools the circuit liquid.
  • the agent temperature therefore rises and the agent is vaporized which causes it to rise inside the closed pipe and moves upward.
  • the valve 34 forces the agent in one direction through the valve device 1, whereby the agent in the second part 33 receives cooling agent and again is liquefied.
  • the liquefied agent flows back downward through the second valve 34 to the circuit liquid and transfers more cooling agent to the circuit liquid inside the wall 32. This causes the circuit liquid to finally start freezing to ice.
  • the cooled liquid transfers cooling energy to the volume 35 and the temperature of the air inside the volume follows the temperature of the circuit liquid.
  • the temperature of the circuit liquid sinks the temperature of the flowing agent also goes down.
  • the temperature of the liquids inside the valve therefore follows the temperature of the circuit liquid and the volume 35. Since the circuit liquid and the first liquid 20 have the same freezing point, the first liquid starts freezing to ice when the circuit liquid starts freezing. And since liquids freezing to ice, preferably water, expands when it freezes the pressure inside the valve house 15 will start rising. The valve house behaves non-elastic, and if there is an air bubble this will be compressed. The liquid therefore expands towards the valve tube 12, which is compressed. This causes the volume of the sealed chamber 23 to decrease therefore the flow of the agent will decrease.
  • the first liquid 20 will freeze to ice since the freezing point of the second liquid 21 is much lower. Since the first liquid does not surround the valve tube 12 around the sealed chamber 23, no ice will hinder the valve tube from being compressed. The compression of the chamber decreases the agent flow and the temperature of the circuit liquid and will start rising, since it receives less cooling energy. The temperature of the agent thereby rises again, which causes the temperature of the liquids 20,21 in the valve device to rise. This results in that the ice of the first liquid 20 starts melting. The pressure inside the valve house thereby goes down and the cooling agent flow increase. The increased flow causes more cooling energy to be transferred to the circuit liquid, whereby the temperature goes down again. This mechanism will cause the temperature of the circuit liquid to oscillate around its freezing point, which for water is around zero degrees Celsius. The temperature of the cooling device volume 35 will thereby substantially stabilize around the freezing point of the cooling liquid.
  • valve device 1 All parts of the valve device 1 have to cooperate in order for it to work.
  • the relation between different volumes and selection of materials much be set depending on how pressure and temperature intends to work together. If the volume increase is too large in relation to the sealed chamber 23, the flow will be decreased too much. Moreover, a large overpressure will rise inside the valve device, which will cause problems.
  • the construction also has to take the laws of thermodynamics into consideration.
  • the valve device is mainly intended to be used together with the cooling device as shown above and fig. 4.
  • the cooling device comprises a cabinet with isolated walls 36, where at least one wall 32 is being filled with the circuit liquid.
  • the valve device 1 automatically regulates the agent flow in the device circuit in order for the liquid to stabilize its temperature around the freezing point, zero degrees Celsius for water.
  • the cooling device is detachably placed against a cooling surface in order to receive cooling energy for its function. It is thereby achieved a cooling cabinet with a compartment inside which food products needing a storage temperature around the freezing point of the circuit liquid.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Temperature-Responsive Valves (AREA)
  • Details Of Valves (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Claims (13)

  1. Ventilvorrichtung (1) für einen Kühlmittelkreis (30), welcher Kreis einen geschlossenen Rohrkreislauf mit Kühlmittel umfasst und welcher Rohrkreislauf zumindest teilweise durch eine erste Flüssigkeit führt, wobei die Ventilvorrichtung die Temperatur der ersten Flüssigkeit durch Anpassen des Kühlmittelstroms im Kreis regelt und dadurch gekennzeichnet ist, dass sie an beiden Enden ein Ansatzrohr (4) mit im wesentlichen parallel zueinander in Längsrichtung des Ansatzrohrs (4) verlaufenden Kanälen (8, 9) umfasst, ohne miteinander verbunden zu sein, wobei die Kanäle (8, 9) in ihren inneren Enden Ventilkanäle (10, 11) aufweisen, die den Kühlmittelkreis mit Öffnungen auf der Hüllfläche des Ansatzrohrs verbinden, wobei die Ventilvorrichtung des weiteren ein Reglerteil besitzt, das mit einem Ventilrohr (12) versehen ist, welches Teile des Ansatzrohrs (4) und Rohrenden (2, 3) des Rohrkreislaufs umschließt, und des weiteren ein Ventilgehäuse (15), welches das Ventilrohr (12) umschließt, wobei eine abgedichtete Kammer (23) im wesentlichen vom Ventilrohr (12) und dem Ansatzrohr eingeschlossen ist, welche Kammer (23) durch die Befestigungselemente (13, 14) an beiden Enden des Rohrs (12) abgedichtet ist und wobei eine erste Kammer (19) im wesentlichen vom Ventilgehäuse (15) eingeschlossen ist und das Ventilrohr (12) zumindest teilweise mit einer zweiten Flüssigkeit (20) gefüllt ist, die zusammen mit einer dritten Flüssigkeit (21), welche mit der zweiten Flüssigkeit (20) nicht mischbar ist, die erste Kammer (19) im wesentlichen füllt, welche dritte Flüssigkeit (21) einen Gefrierpunkt aufweist, der erheblich niedriger ist als der Gefrierpunkt der zweiten Flüssigkeit (20), und eine Dichte, die sich von der Dichte der zweiten Flüssigkeit (20) wesentlich unterscheidet.
  2. Ventilvorrichtung (1) gemäß Anspruch 1, wobei die Ventilvorrichtung (1) zwei Anschlüsse (6, 7) umfasst, deren jede im Inneren einen Kanal (8, 9) besitzt, welche Anschlüsse so beschaffen sind, dass sie eine im wesentlichen feste Verbindung mit den Rohrenden (2, 3) des Rohrkreislaufs schaffen.
  3. Ventilvorrichtung (1) gemäß Anspruch 2, wobei die Anschlüsse (6, 7) und das Ansatzrohr einstückig mit der selben Mittelachse ausgeführt sind und die Kanäle (8, 9, 19, 11) die zwei Rohrenden (2, 3) miteinander verbinden.
  4. Ventilvorrichtung (1) gemäß einem der vorangehenden Ansprüche, wobei die dritte Flüssigkeit (21) im wesentlichen des gesamte Ansatzrohr (4) umschließt.
  5. Ventilvorrichtung gemäß einem der vorangehenden Ansprüche, wobei die zweite Flüssigkeit (20) auf Wasser basiert und einen Gefrierpunkt von annähernd null Grad Celsius aufweist.
  6. Ventilvorrichtung gemäß einem der vorangehenden Ansprüche, wobei die zweite Flüssigkeit (20) einen Gefrierpunkt aufweist, der dem Gefrierpunkt der ersten Flüssigkeit nahe kommt.
  7. Ventilvorrichtung gemäß einem der vorangehenden Ansprüche, wobei das Volumen der zweiten Kammer (23) geringer oder gleich der Volumenänderung der zweiten Flüssigkeit(20) ist, wenn diese gefriert und sich ausdehnt.
  8. Ventilvorrichtung gemäß einem der vorangehenden Ansprüche, wobei das Ventilgehäuse (15) so ausgeführt ist, dass es die erste Kammer (19) im wesentlichen abdichtet und deren Volumen trotz Druckänderungen in der Kammer im wesentlichen konstant hält.
  9. Ventilvorrichtung gemäß einem der vorangehenden Ansprüche, wobei das Ventilgehäuse (15) so ausgeführt ist, dass es die erste Kammer (19) im wesentlichen abdichtet und eine Änderung von deren Volumen in Abhängigkeit von Druckänderungen in der Kammer (19) ermöglicht.
  10. Verwendung der Ventilvorrichtung gemäß einem der Ansprüche 1 - 9 zusammen mit einer Kühlvorrichtung, welche Kühlvorrichtung ein Volumen (35) und Mittel zur Aufrechterhaltung einer im wesentlichen konstanten Temperatur innerhalb des Volumens (35) umfasst.
  11. Verwendung der Ventilvorrichtung gemäß Anspruch 10, wobei mindestens eine (32) der das Volumen umgebenden Wandseiten (36) im wesentlichen mit der ersten Flüssigkeit gefüllt ist, wobei die erste Flüssigkeit (32) dazu beiträgt, die Temperatur im Volumen (35) zu beeinflussen.
  12. Verwendung der Ventilvorrichtung gemäß Anspruch 11, wobei sich ein zweites Teil (33) des geschlossenen Rohrkreislaufs in trennbarem Kontakt mit einer Kühlfläche erstreckt, welcher Kontakt einen geringen Wärmewiderstand zwischen der Oberfläche und dem Teil bewirkt, wobei die Kühlfläche Kühlenergie überträgt, die das Mittel im Kühlmittelkreis (30) zum Fließen bringt.
  13. Verwendung der Ventilvorrichtung gemäß einem der Ansprüche 1 - 12, wobei ein am Kühlmittelkreis angebrachtes zweites Ventil (34) dem Kühlmittel das Strömen in nur eine Richtung erlaubt.
EP02445185A 2002-01-09 2002-12-19 Automatisches Kühlmediumventil Expired - Lifetime EP1327837B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0200048A SE0200048D0 (sv) 2002-01-09 2002-01-09 Ventil för kylanordning
SE0200048 2002-01-09

Publications (3)

Publication Number Publication Date
EP1327837A2 EP1327837A2 (de) 2003-07-16
EP1327837A3 EP1327837A3 (de) 2005-09-07
EP1327837B1 true EP1327837B1 (de) 2007-11-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02445185A Expired - Lifetime EP1327837B1 (de) 2002-01-09 2002-12-19 Automatisches Kühlmediumventil

Country Status (4)

Country Link
EP (1) EP1327837B1 (de)
AT (1) ATE377739T1 (de)
DE (1) DE60223331T2 (de)
SE (1) SE0200048D0 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2444762A1 (de) * 2010-10-20 2012-04-25 Whirlpool Corporation Kältegerät mit einem 0-Grad-Fach

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB654278A (en) * 1947-07-08 1951-06-13 British Thomson Houston Co Ltd Improvements in and relating to snap action valves
US2657861A (en) * 1948-11-13 1953-11-03 Detroit Controls Corp Refrigeration controlling valve
NL8104565A (nl) * 1981-10-07 1983-05-02 Philips Nv Koelkast.
EP0098052A3 (de) * 1982-06-26 1984-03-28 THORN EMI Domestic Appliances Limited Gefriereinrichtungen

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Publication number Publication date
DE60223331D1 (de) 2007-12-20
SE0200048D0 (sv) 2002-01-09
EP1327837A3 (de) 2005-09-07
ATE377739T1 (de) 2007-11-15
DE60223331T2 (de) 2008-09-04
EP1327837A2 (de) 2003-07-16

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