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
  • F25B40/00—Subcoolers, desuperheaters or superheaters
  • F25B40/06—Superheaters
• • 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
  • F25B41/00—Fluid-circulation arrangements
  • F25B41/30—Expansion means; Dispositions thereof
  • F25B41/37—Capillary tubes
• • 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
  • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
  • F25B2400/05—Compression system with heat exchange between particular parts of the system
  • F25B2400/052—Compression system with heat exchange between particular parts of the system between the capillary tube and another part of the refrigeration cycle
• • 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
  • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
  • F25B2400/05—Compression system with heat exchange between particular parts of the system
  • F25B2400/054—Compression system with heat exchange between particular parts of the system between the suction tube of the compressor and another part of the cycle

Definitions

• Refrigeration appliance throttle pipe for a refrigeration device and method for its production
• the invention relates to a refrigeration device, a throttle tube for a refrigeration device, and a method for its production.
• Refrigerating appliances extract heat from a room with a low temperature level, the interior of the refrigerating appliance, in order to dispense it in a room with a higher temperature level, as a rule in the space surrounding the refrigerating appliance.
• refrigerants are used, which evaporate at low temperatures.
• the refrigerant circulates in a closed pipe system, the refrigerant circuit.
• the refrigerant circuit comprises an evaporator, a compressor (compressor), a condenser (condenser) and a throttle body.
• the refrigerant evaporates at low pressure and thereby deprives the interior of heat.
• the resulting gaseous refrigerant is led out of the interior and fed via a so-called intake manifold to the compressor, which compresses it and forwards the compressed and thus increased in its temperature refrigerant to the condenser.
• the refrigerant releases heat to the ambient air.
• the liquefied refrigerant then passes through the throttle body, in which the pressure is reduced in the evaporator. The refrigerant cycle starts again.
• the suction pipe leading to the compressor usually consists of aluminum, since it is formed in one piece with the evaporator.
• the throttle tube comprises a metal tube which is encased with a plastic layer over at least part of its length.
• a plastic layer insulates the two tubes very well from one another electrically.
• plastic is not very thermally conductive, but the plastic layer is chosen to be sufficiently thin, still finds a heat exchange between the intake manifold and throttle pipe instead.
• the plastic layer is better corrosion resistant than, for example, a galvanically applied zinc layer.
• the plastic layer can be easily removed from the pipe ends, for example by simply slitting and peeling, which requires no tool other than the fingernail.
• the pipe ends of the throttle tube must be blank, so that the throttle tube can be mounted on the one hand at the injection point of the evaporator and on the other hand on a drying cartridge or at the outlet of the condenser.
• the metal tube of the throttle tube is made of copper or a copper alloy, since copper tubes are easy to manufacture and sufficiently flexible.
• the throttle tube is preferably about 30 cm to 3 m long and has an outer diameter of about 0.5-4 mm and an inner diameter of about 0.5-0.8 mm. By varying the length or the inner diameter of the throttle tube, the pressure loss to be achieved can be adjusted.
• the plastic layer is preferably as thin as possible to produce. It preferably has a thickness of between 20 and 500 .mu.m, preferably between 50 and 300 .mu.m, more preferably between 100 and 200 .mu.m. This ensures that sufficient heat exchange takes place between the throttle tube and the suction tube in contact therewith.
• the plastic layer preferably comprises a thermoplastic or thermosetting plastic or consists entirely of such a plastic, such as PUR (polyurethane), PP (polypropylene) or PE (polyethylene). Particularly preferably, the plastic is extrudable, so that the plastic layer can be applied by co-extrusion on the throttle tube. Such a co-extruded coating can be easily removed without damaging the base material.
• the plastic layer is doped with a thermally conductive additive material.
• the plastic material used for the plastic layer graphite powder, less preferably metal powder are buried.
• the thermally conductive filler may also be zinc oxide, quartz, starch or talc.
• the throttle tube is preferably in contact with at least a portion of its length in contact with a suction pipe leading to a compressor.
• a plastic layer arranged on the outside of the throttle tube touches the outside of the suction tube at least at one point, so that a thermal bridge is produced.
• the section of the throttle tube which is in contact with the suction pipe runs parallel to a section of the suction pipe.
• the throttle tube it is also possible for the throttle tube to have a plurality of sections which run parallel to a section of the suction tube, namely in that the throttle tube passes through at least one hairpin curve and thus leads past one and the same section of the suction tube with two sections which guide the refrigerant in opposite directions becomes.
• the portions of the throttle tube and the suction tube in contact with each other are fixed to each other.
• the attachment can be done for example by a clamp or a suitable adhesive.
• the respective sections of the throttle tube and the suction tube are secured together by an adhesive tape.
• the adhesive tape is preferably aligned along the tube axes, so it is glued lengthwise and preferably extends at least substantially over the entire contacting portion of the throttle tube and the suction tube.
• the refrigerator is preferably a household refrigerator, in particular a refrigerator, a freezer or a fridge-freezer.
• the invention is also directed to a throttle tube for a refrigerator, wherein the throttle tube comprises a metal tube, which is coated on its outside with a plastic layer.
• the throttle tube is preferably configured as described above.
• the invention is also directed to a method for producing a throttle tube, comprising the following steps: providing a metal tube, in particular a tube made of copper or a copper alloy, and coating the outer side of the metal tube by co-extruding with a thermoplastic material.
• the metal tube is made in a known manner, it may be made of copper or of a suitable copper alloy.
• the metal tube is preferably in the form of endless goods, for example wound up on a roll. From there it is pulled as a soul through an extruder, which by co-extrusion encases the outside of the metal tube with a plastic or coated.
• the method is preferably carried out in a similar manner as in the sheathing of cables. After coextrusion, the coated metal tube is preferably once again wound onto a roll after the plastic layer has cured.
• the co-extruded product can already be tailored to individual throttle tubes.
• Fig. 2 shows a cross section through the suction pipe and throttle pipe along the line AA of Fig. 1.
• Fig. 3 shows a cross section through the intake manifold and throttle tube, according to a first
• Embodiment are attached to each other;
• FIG. 4 shows a cross section through the suction pipe and throttle pipe, which are fastened together according to a second embodiment.
• Fig. 5 is a schematic representation of the manufacturing method according to the invention.
• FIG. 1 shows a refrigerant circuit of a refrigerant appliance, as used in particular for household refrigerators.
• the refrigerant evaporates and thereby deprives the interior of the refrigerator heat.
• the evaporated refrigerant is supplied to the compressor 15.
• the compressed refrigerant flows through the coils 17 of the condenser 16, which is arranged for example on the rear wall or in a side wall of the refrigerator.
• the liquefied refrigerant then flows through a dryer 18 through the throttle tube 2. This can be up to 2 to 3 meters long, which is why it is guided in snakes 2 'compact.
• the throttle pipe 2 Over a part L of its length, the throttle pipe 2 is guided in parallel and in touching contact with a corresponding portion of the suction pipe 4 leading to the compressor.
• the length L, along which the suction pipe 4 and the throttle tube 2 are to be in physical contact, is for example 5 cm to 1 m, preferably about 20 to 40 cm.
• the evaporator 13 is preferably a so-called "tube-on-sheet” evaporator, in which the tube coil 14 is mounted on a plate.
• the heat exchange between the intake manifold 4 and the throttle tube 2 preferably by direct contact of both tubes.
• FIG. 2 shows the suction pipe 4 and the throttle pipe 2 in contact therewith in cross-section.
• the suction tube 4 is typically made of aluminum or an aluminum alloy.
• the suction tube 2 according to the invention consists of a copper tube 12, which is covered with a plastic layer 22.
• the outer diameter of the copper tube 12 is about 1, 8 mm, the inner diameter of about 0.5 mm.
• the Plastic layer 22 with a thickness of about 0.2 mm is in touching contact with the suction pipe 4.
• At one end 11 of the suction pipe this is connected to the evaporator 13 and there preferably soldered to this. Therefore, it is important to be able to easily remove the plastic layer 22 at the ends of the suction tube 2.
• this is connected to a drying cartridge 18 or to the condenser 16. Also, this connection can be made by soldering or welding, so that at the end 19, the throttle tube 2 must be freed from the plastic layer 22.
• FIG. 3 and 4 show preferred ways of connecting the suction pipe 4 with the throttle tube 2.
• an adhesive tape 6 is used, preferably a plastic adhesive tape which extends lengthwise around the portions of the length L of the suction pipe 4 and the throttle tube 2 is glued.
• a clamp 8 for example made of plastic, can also be used in order to hold the throttle tube 2 in heat-conducting contact with the suction tube 4.
• a metal pipe in particular copper pipe 12
• the copper tube 12 is initially wound as a continuous material on a roll 30.
• the extruder is also liquid plastic supplied via the worm drive 34.
• the copper tube 12 is pulled as a core or core through the extrusion die 33 and encased there from the outside with the plastic.
• the plastic hardens, and the coated throttle tube material 2 is wound on a further roller 36.
• an endless throttle tube 2 according to the invention is produced, which can be processed by cutting into finished throttle tubes.
• the plastic material contained in the screw 34 is, for example, PUR or PA (polyamide), wherein the liquid plastic may be mixed with a thermally conductive material in powder or granular form. For this purpose, preferably graphite comes into question.
• the invention provides an easily manufactured, corrosion-resistant throttle tube, which can be guided in heat-conducting contact with a suction tube or end portion of an evaporator tube, without violating standard specifications.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Laminated Bodies (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=42125908

Family Applications (1)

Country Status (4)

Cited By (4)

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Citations (7)

Family Cites Families (2)

• 2009
  • 2009-03-19 DE DE102009001677A patent/DE102009001677A1/de not_active Withdrawn
• 2010
  • 2010-02-18 WO PCT/EP2010/052024 patent/WO2010105884A1/de active Application Filing
  • 2010-02-18 PL PL10704567T patent/PL2409094T3/pl unknown
  • 2010-02-18 EP EP10704567.6A patent/EP2409094B1/de active Active

Patent Citations (7)

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