Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
  • F28F9/02—Header boxes; End plates
  • F28F9/0246—Arrangements for connecting header boxes with flow lines
  • F28F9/0248—Arrangements for sealing connectors to header boxes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K1/00—Soldering, e.g. brazing, or unsoldering
  • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
  • B23K1/0012—Brazing heat exchangers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K2101/00—Articles made by soldering, welding or cutting
  • B23K2101/04—Tubular or hollow articles
  • B23K2101/14—Heat exchangers
• • 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
  • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
  • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
  • F28D9/0043—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
• • 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
  • F28F2275/04—Fastening; Joining by brazing

Definitions

• the present invention relates to, among other things, a heat exchanger including a brazed connection of a connecting piece in a flow opening.
• Heat exchangers can include an opening edge that is erected in the manner of a flange perpendicularly with respect to the plane of the flow opening, in order to obtain a sufficient connecting face. Since the opening edge is arranged perpendicularly, the connecting face is of cylindrical configuration in the case of an approximately round opening.
• the connection piece is inserted and can later be brazed in the opening. In order to ensure that the connection piece remains in its position during pre-assembly, for example of a heat exchanger, the opening edge has to be clinched, for which a special tool is required.
• the metal sheet, in which the flow opening is situated, is normally provided with a braze layer.
• braze supply is typically not sufficient with the result that additional braze material, for example what is known as a braze ring, has to be introduced in the region of the brazed connection which is to be produced, as is disclosed, for example, in US 5 593 187, Figs 13-17.
• the provision of additional braze material can be dispensed with by virtue of the fact that the opening edge has an inclination with respect to the plane of the flow opening, and the connection piece can be pressed onto the inclined opening edge by means of a force during the hardening process.
• the force is sufficient to eliminate every air gap or reduce the number of air gaps between the inclined opening edge and the corresponding connecting face of the connection piece.
• the connecting face according to some embodiments has a conical design.
• Fig. 1 shows a section through a connecting piece which is seated in a flow opening.
• Fig. 2 shows part of a heat exchanger which has the connection piece.
• Fig. 3 shows a second exemplary embodiment.
• Fig. 4 shows a third exemplary embodiment. DETAILED DESCRIPTION
• Figs. 1 and 2 form one exemplary embodiment.
• the component 4 is the cover plate of a heat exchanger, which is a plate heat exchanger which can serve, for example, as an oil cooler.
• the plates 6 and other components are produced from metal plates by known forming technology operations and are assembled to form the plate heat exchanger.
• the cover plate has a bond coating 3 on its underside (Fig. 2). Otherwise, the brazing or soldering, such as, for example herein brazing, and the preparatory measures required for this such as degreasing, optionally application of braze flux, drying, etc., is not discussed herein because reference can be made to the prior art in this respect.
• the flow opening 2 is a, for example, circular hole in the cover plate 3.
• the opening edge 20 is directed upward in the manner of a flange, with the result that the mentioned braze coating 3 points obliquely upward. It does not lie perpendicularly on the plane 5 (dash-dotted line) of the flow opening 2, but rather has an inclination 10 which can be, for example, approximately 10 degrees with respect to an axis that is perpendicular to the plane 5.
• the inclination 10 is directed outward. It extends about the entire opening edge 20.
• the connection piece 1 has a conical configuration which corresponds with the inclined opening edge 20, and is placed into the flow opening 2 from above, with the result that the latter rests fully on the coated opening edge 20.
• the conical configuration can be produced by a forming step on the edge of the connection piece 1 , the wall of the connection piece 1 being pressed inward.
• the connection piece 1 is pressed firmly onto the opening edge 20 which is coated with braze material by a force F during the brazing.
• the conical configuration of the opening edge 20 and the connecting face on the connection piece 1 bring about a certain centering of the force F.
• the braze layer 3 will melt during brazing and bring about the brazed connection.
• the force F will ensure that the mentioned contact of the connecting faces is maintained or that the connection piece 1 is correspondingly tracked, in order to prevent and inhibit an air gap.
• the annular joint or recess 7 which is still visible in Fig. 1 between the opening edge 20 and a shoulder on the connection piece 1 may no longer be present after brazing. At any rate, the width is reduced by the force F.
• the force F can be generated, for example, by an applied weight, or there can be a stressing device.
• connection piece 1 in the flow opening 2 Only if a desired orientation of the connection piece 1 in the flow opening 2 is desired, a marking or the like can be formed in the opening edge 20 and in the corresponding formation of the connection piece 1.
• connection piece 1 is not plugged onto the opening edge 20 and loaded with the force F until immediately before the start of brazing.
• connection piece 1 serves to connect a feed or discharging line, for example for coolant or for oil. However, it can also be a plug-in connecting piece 1, to which no line is therefore connected, but rather which is plugged into another flow opening and is sealed.
• the height of the opening edge 20 was selected to be approximately 2.0 mm, with an opening diameter of approximately 16-20 mm. Tight and sufficiently firm brazed connections were made available.
• the exemplary embodiment according to Fig. 3 has an inclined opening edge 20, but the opening edge 20 was bent away not so as to point upward but rather so as to point downward.
• the inclination angle 10 does not point to the outside, as in the exemplary embodiment of Figs. 1 and 2, but rather to the inside.
• the brazed connection 3 can be situated on both sides of the component 4, or it is situated at least on the upper side of the latter.
• connection piece 1 has an inclined opening edge 20 which is also arranged so as to point upward.
• the wall of the connection piece 1 was pressed to the outside, in order to produce the conical configuration.
• the connection piece 1 is plugged through the flow opening 2 from below, with the result that its corresponding
• connection piece 1 has a support (it lies, for example, on a heat exchanger plate 6), the force F likewise brings about full contact in the region of the connecting face and the inclined opening edge 20 and it prevents or inhibits the formation of an air gap in between.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Details Of Heat-Exchange And Heat-Transfer (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

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Citations (4)

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• 2010
  • 2010-09-15 DE DE102010045535.0A patent/DE102010045535C5/de active Active
• 2011
  • 2011-09-15 WO PCT/US2011/051768 patent/WO2012037354A1/en active Application Filing

Patent Citations (4)

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