Classifications

• • 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
  • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
  • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
  • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
  • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
  • F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
  • F28D1/0478—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag the conduits having a non-circular cross-section
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D53/00—Making other particular articles
  • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
  • B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
• • 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
  • F25B39/00—Evaporators; Condensers
  • F25B39/02—Evaporators
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F1/00—Tubular elements; Assemblies of tubular elements
• • 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
  • F25B2339/00—Details of evaporators; Details of condensers
  • F25B2339/02—Details of evaporators
  • F25B2339/022—Evaporators constructed from a pair of plates forming a space in which is located a refrigerant carrying coil
• • 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
  • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
  • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
  • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
  • F28D2021/0071—Evaporators
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2275/00—Fastening; Joining
  • F28F2275/02—Fastening; Joining by using bonding materials; by embedding elements in particular materials
  • F28F2275/025—Fastening; Joining by using bonding materials; by embedding elements in particular materials by using adhesives

Definitions

• the present invention relates to a heat exchanger, in particular an evaporator for a refrigerator, such as a household refrigerator or freezer, and a method for its production.
• a heat exchanger which is made up of a carrier plate, a meandering tube extending over the carrier plate for a refrigerant and a heat-insulating layer of a bitumen composition.
• the bitumen layer is first placed in the form of a plate on the arrangement of the carrier plate and the refrigerant tube and then molded with the aid of a stamp in which a meandering groove is formed on the base plate in accordance with the course of the refrigerant tube.
• the bitumen layer has different thicknesses on opposite sides of the pipe, or the bituminous layer tears in places when it is molded onto the base plate and the refrigerant pipe. If the positional deviation is so great that the tube is no longer inside the channel, it is squeezed flat when the plunger is pressed on and the evaporator is destroyed.
• the stroke of the stamp must be at least so large that the bitumen layer comes into contact with the carrier plate in the area between the meanders of the refrigerant pipe. If the Hüb is larger than is absolutely necessary for this, the bilumen material is driven into the gusset between the pipeline, which is elliptical in cross section, and the carrier plate.
• the known method is therefore unusable if, instead of the bitumen plate, a plate is to be formed from a highly effective heat-insulating material, since the penetration of such a material into the gusset would impair the heat exchange between the refrigerant tube and the base plate and thus the efficiency of the evaporator ,
• the object of the present invention is to provide a method for producing a heat exchanger which allows the production of high-quality heat exchangers even with low demands on the production tolerances, or a heat exchanger which can be produced using such a method.
• the object is achieved according to the invention in that the molded part is made of Solating material is provided from the outset with a preformed groove running on its surface, in which the tube is placed before the carrier plate is attached to the surface. Even if the angles of curvature on the various bends of the tube differ slightly from the corresponding angles of the channel, the tube can still be inserted into the channel without difficulty by slightly elastic bending. Crushing of the pipe between the molded part and the carrier plate is thus excluded.
• the thickness of the tube perpendicular to the surface of the molded part is initially greater than the depth of the groove formed therein, so that the tube, even if it rests on the bottom of the groove, protrudes a little from it. If now the molded part and the carrier plate are pressed against one another in order to bring at least parts of the surface of the molded part into contact with the carrier plate, the tube between the carrier plate and the molded part is simultaneously flattened, as a result of which the heat transfer between the plate and the tube is more desirable Way improved.
• the molded part can be produced simply and economically by expanding a plastic material in a mold.
• Polystyrene and polyurethane are particularly suitable as the plastic material to be expanded.
• the expanded material In order to achieve a good insulation effect, a high proportion of pores in the expanded material is desirable; on the other hand, the expanded material must have sufficient strength to flatten the refrigerant pipe.
• the molded part and the carrier plate are preferably connected by gluing, in particular with the aid of an adhesive film.
• This adhesive film is preferably attached to the molded part, since, as an alternative to this, adhesive film attached to the carrier plate would have to be left free in each case at the regions of the carrier plate which are in contact with the refrigerant pipe, in order not to impair the heat transfer between the pipe and carrier plate.
• Fig. 1 is a perspective view of the components of an evaporator according to the invention before they are assembled;
• FIG. 2 shows a section through a completely assembled evaporator according to the invention.
• a support plate of the evaporator made of aluminum with 1 a refrigerant tube with 2 and a molded part made of polystyrene foam with 3 is designated.
• the refrigerant tube 2 has a suction line connection which is provided for connection to an inlet of a compressor in order to draw evaporated refrigerant out of the tube 2, and a capillary 5 which extends inside the suction line connection and is intended to supply liquid refrigerant from a condenser ,
• the free end of the capillary 5 is caulked at a constriction 6 of the refrigerant tube 2. From here, the refrigerant flows through the meandering pipe 2 to a connection point 7, where it opens again on the suction line connection 4.
• the molded part 3 is a plate made of polystyrene foam, in the top 8 of which a groove 9 is formed, the course of which corresponds to the shape of the refrigerant tube 2.
• the depth of the channel 9 is somewhat less than the diameter of the refrigerant tube 2, which is circular in cross section before the individual components 1, 2, 3 of the evaporator are joined.
• the density of the polystyrene foam is 40 g / dm.
• a fast-adhering adhesive is applied to the top 8 of the molded part 3.
• the evaporator is assembled by first inserting the refrigerant tube 2 into the channel 9 of the molded part 3.
• the carrier plate 1 placed on the molded part 3 and the refrigerant tube initially only touches the refrigerant tube ⁇ 2.
• the arrangement thus created is compressed between two stamps of a press (not shown).
• the strength of the material of the molded part 3 and the wall thickness of the refrigerant tube 2 are coordinated with one another in such a way that a plastic deformation of the tube cross section occurs before the top side 8 comes into contact with the carrier plate 1.
• the foam material may be compressed in areas of the molded part 3 at the bottom of the channel 9.
• the force of the press is determined so that the molded part 3 cannot be compressed over its entire surface, but rather the movement of the stamp comes to a standstill when the upper side 8 touches the carrier plate 1. Penetration of the material of the molded part 3 into the gusset 11 between the refrigerant tube 2 and the carrier plate 1 is thus excluded in the example shown. Depending on the choice of density for the foamed polystyrene molded part 3, the gussets 11 can, however, also be filled with the material of the molded part 3.
• a temperature sensor 12 for monitoring the temperature of the evaporator can be inserted into a groove 13 extending from the edge of the molded part 3 between two parallel sections of the channel 9 before or after the carrier plate 1 and molded part 3 are glued together.
• the carrier plate 1 and molding 3 are instead using a Medicaretra g enes adhesive product using an adhesive film secured together.
• This adhesive film is applied to the top 8 of the molded part 3 before the refrigerant tube 2 is inserted into the channel 9.
• the refrigerant tube 2 is then placed on the adhesive film above the channel 9 and pressed into the channel 9, the adhesive film being able to tear or stretch along the channel 9, depending on the material properties.
• the flattening of the refrigerant tube 2 and the adhering of the carrier plate 1 and the film part 3 take place in a single operation.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)
• Laminated Bodies (AREA)
• Separation By Low-Temperature Treatments (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=34683833

Family Applications (1)

Country Status (7)

Families Citing this family (12)

Family Cites Families (9)

• 2003
  • 2003-12-23 DE DE10360900A patent/DE10360900A1/de not_active Withdrawn
• 2004
  • 2004-12-09 CN CNB2004800388191A patent/CN100533035C/zh not_active Expired - Fee Related
  • 2004-12-09 ES ES04804740T patent/ES2332912T3/es not_active Expired - Lifetime
  • 2004-12-09 WO PCT/EP2004/053365 patent/WO2005066564A1/fr not_active Ceased
  • 2004-12-09 AT AT04804740T patent/ATE443838T1/de not_active IP Right Cessation
  • 2004-12-09 DE DE502004010134T patent/DE502004010134D1/de not_active Expired - Lifetime
  • 2004-12-09 EP EP04804740A patent/EP1702190B1/fr not_active Expired - Lifetime
  • 2004-12-09 RU RU2006120461/06A patent/RU2350872C2/ru not_active IP Right Cessation

Non-Patent Citations (1)

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