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
  • F25B39/00—Evaporators; Condensers
  • F25B39/02—Evaporators
  • F25B39/022—Evaporators with plate-like or laminated elements
  • F25B39/024—Evaporators with plate-like or laminated elements with elements constructed in the shape of a hollow panel
• • 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
  • B21D41/00—Application of procedures in order to alter the diameter of tube ends
  • B21D41/02—Enlarging
• • 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
  • B21D53/04—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of sheet metal
  • B21D53/045—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of sheet metal by inflating partially united plates
• • 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

Definitions

• the present invention relates to the assembly of a capillary line in an evaporator board, a tool suitable for this purpose and an evaporator board manufactured using the method and / or the tool.
• Evaporator boards for refrigeration devices in particular so-called cold wall evaporators, are conventionally produced by fastening two sheets of different thicknesses to one another over a flat area, but those areas of the sheets which are intended to form a refrigerant line of the evaporator remain unconnected. By pressing a fluid between the two plates, the unconnected areas are spread apart and the refrigerant line is opened, the stronger of the two plates remaining practically undeformed due to the different thicknesses of the two plates.
• the fact that the thicker sheet remains flat is of great importance for the practical usability of the evaporator, because in order to achieve effective cooling, this sheet must be able to be glued to the entire outside of a refrigeration device inner container. Bumps in the sheet would result in air pockets being trapped between it and the inner container. These would impair the heat exchange between the interior of the refrigeration device and the evaporator and thus lead to increased power consumption by the refrigeration device.
• a supply line and a suction line for the refrigerant must be connected to the evaporator.
• the supply line is a capillary line, which is led inside the suction line before entering the evaporator in order to achieve pre-cooling of the liquefied refrigerant supplied in the capillary line by thermal contact with the evacuated, evaporated refrigerant.
• a connecting line section 2 is usually provided on an evaporator 1, as shown in a perspective view in FIG. 1, which extends from a side edge into the interior of the evaporator 1 and whose cross section is dimensioned such that a suction line 4 is therein can be inserted and hermetically sealed.
• a conically tapering section 3 which finally merges into a capillary channel 6, the cross section of which is adapted to insert and fasten the capillary supply line 7 through the suction line 4 therein.
• the cross section of the refrigerant line 5 of the evaporator 1 widens again. It extends in a meandering manner over the entire surface of the evaporator 1 and finally meets the connecting line section 2 at the transition to the conical section 3.
• Another problem with the thickening of the connecting line section 32 and the capillary channel 6 is that the risk of damage, e.g. in the form of an opening in one of the two plates 8, 9, which makes the entire evaporator unusable.
• Burrs that may arise during thinning disturb the flow of the coolant and thus lead to undesirable noise generation.
• the object of the present invention is to provide a method for mounting a capillary line in an evaporator, a tool for this purpose and an evaporator board, which make it possible to measure the amount of unevenness on the thicker plate of the evaporator, which is the thermal contact between this plate and a Refrigerator inner containers can be minimized, the reject rate during assembly and the noise during operation of the evaporator can be minimized.
• connection line cut and the capillary channel are also possible.
• a simultaneous widening of the connection line cut and the capillary channel is also possible.
• Such a tool can be formed in one piece, with a second mandrel starting from the tip of the first mandrel.
• the second mandrel is slidably guided in a channel of the first mandrel.
• the stamping of the capillary channel with the capillary line inserted therein is preferably carried out with the aid of a pair of stamp and die, the die embossing two grooves on both sides of the capillary line into the flat plate of the evaporator.
• the stamping is preferably carried out under the action of heat and / or ultrasound.
• FIG. 2 is a perspective view of a set of expansion tools for mounting a capillary line and a suction line on the evaporator of FIG. 1;
• 3 shows a one-piece combined expansion tool
• 4 shows a combined expansion tool with mandrels which can be moved relative to one another
• Fig. 5 shows a schematic section through the embossed evaporator in the region of its capillary channel and through a stamp and a die for performing the
• FIG. 6 is a perspective view of a modified expansion tool
• FIG. 7 shows a section through the connection area of an evaporator board machined with the tool from FIG. 6.
• FIG. 2 shows a perspective view of a set of two expansion tools with spikes 11 and 12, which can be inserted into a connecting line cut or a capillary channel of an evaporator board in order to expand them appropriately for receiving a suction line or a capillary line.
• the first mandrel 11 is a rigid metal pin with a tapered tip 16 and a body of essentially cylindrical shape, into which a flat side surface 17 is milled on one side.
• the side surface 17 extends up to a shoulder 18 over a length which corresponds to the desired depth of penetration of the mandrel 11 into the connecting line section 2 of the evaporator 1.
• the shape of the second mandrel 12 is largely analog, an essentially cylindrical body with a conical tip 14 and a flat side surface 15. Its diameter is approximately 2 mm.
• FIG. 3 shows a combined expansion tool that can be regarded as a rigid connection between the two mandrels 11 and 12, the narrower second mandrel 12 extending in the same direction as the latter, starting from the tip of the wider mandrel.
• This tool allows the connection line section 2 and the capillary channel 6 to be widened in one operation.
• the length of the second mandrel 12 and that of the The connecting line section determines whether the capillary channel 6, first the connecting line section 2 or both are expanded at the same time.
• the combined expansion tool shown in a perspective view in FIG. 4 comprises an inner mandrel 12 which is provided for expanding the capillary channel 6 of the evaporator board and which is displaceably guided in a channel 13 of an outer mandrel 11.
• FIG. 4 Details of the mandrels 11, 12, which are also based on the exemplary embodiments of FIGS. 2 and 3 are realized, are designated in FIG. 4 with the same reference numerals and are not described again.
• the inner mandrel 12 is guided in a bore of the outer mandrel 11, which merges into an open-ended channel 13 on the side surface 17.
• the side surface 15 of the inner mandrel 12 lies in this channel 13 in a plane with the side surface 17 of the outer mandrel 11.
• the outer mandrel 11 is first inserted into the connecting line section 2, which has already been partially expanded by injecting fluid.
• the mandrel 11 is oriented such that its flat side surface 17 rests on the thicker plate 8 of the evaporator, which is not to be deformed.
• the force exerted by the mandrel 11 when expanding onto the two plates 8, 9 is thus distributed on the side facing the thicker plate 8 over the entire extent of the side surface 15, so that a significantly smaller pressure acts on the plate 8 than on the opposite one.
• the outer mandrel 11 As soon as the shoulder 18, which forms the end of the side surface 17 of the outer mandrel 11, abuts the edge of the connecting line section 2, the outer mandrel 11 has reached the required penetration depth. Now the inner mandrel 12 is driven through the channel 13 of the outer mandrel 11, which in this way is guided directly into the capillary channel 6. During the widening of the capillary channel 6, the outer mandrel 11 remains in its position in the suction connection 2. In this way, it is excluded that the inner mandrel 12 under the action of a propelling force acting in the longitudinal direction final line section 2 breaks out sideways, thereby bending and piercing one of the plates 8 or 9 of the evaporator 1 or otherwise damaged.
• the supply line 7 and the suction line 8 are inserted into the capillary channel 6 and the connecting line section 2 and fastened therein.
• the supply line is attached by stamping using a stamp and a die; with the suction line 8 it can e.g. done by soldering.
• stamp 20 and / or die 21 are provided with a heating device (not shown) equipped, which serves to melt an aluminum layer between the plates 8, 9 and the capillary line 7 and to connect the latter so tightly to the plates 8, 9.
• a sonotrode for ultrasonic welding can also be provided.
• the punch 20 has an elongated groove 22 of essentially semi-cylindrical shape, parallel to which two ribs 23 extend over the surface of the die 21.
• the shape of the groove 22 and the ribs 23 are defined such that after the stamping the two plates 8, 9 tightly enclose the supply line 7 over its entire circumference.
• the two sharp-edged ribs 23 already press two parallel shafts 25 into the thicker plate 8 in an early phase of the embossing process, which fix the position of the supply line 7 and prevent undesired deformation of its cross section during the embossing.
• the resulting recesses 24 on the outer surface of the plate 8 do not adversely affect the behavior and the stability of the evaporator 1, since their surface is too small to impair the heat exchange between the evaporator and a refrigeration device inner container with which the Evaporator is glued, and since they do not extend to the edge of the evaporator board, no moisture can penetrate into it, which could lead to detachment of the evaporator 1.
• FIG. 6 shows a perspective view of an expansion tool, which represents a modified embodiment of the tool from FIG. 4.
• the outer mandrel 11 has here between its tapered tip 16 and a conical shoulder 27 NEN cylindrical portion 28, the diameter of which is smaller than the outer diameter of the suction line 4 to be mounted in the connecting line section 2.
• the diameter of the section 28 can even be so small that it can be inserted into the connecting line section expanded only by injecting fluid, without this additionally to deform.
• the shape of the conical tip 16 corresponds to that of the conical line section 3.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
• Sampling And Sample Adjustment (AREA)
• Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7712865

Family Applications (1)

Country Status (7)

Cited By (3)

Families Citing this family (2)

Citations (5)

• 2002
  • 2002-01-23 DE DE10202496A patent/DE10202496A1/de not_active Withdrawn
• 2003
  • 2003-01-22 BR BR0307035-2A patent/BR0307035A/pt not_active Application Discontinuation
  • 2003-01-22 PL PL03369652A patent/PL369652A1/xx unknown
  • 2003-01-22 WO PCT/EP2003/000617 patent/WO2003062719A1/de not_active Application Discontinuation
  • 2003-01-22 CN CNA03802652XA patent/CN1623070A/zh active Pending
  • 2003-01-22 RU RU2004122628/06A patent/RU2004122628A/ru not_active Application Discontinuation
  • 2003-01-22 EP EP20030708069 patent/EP1470374A1/de not_active Withdrawn

Patent Citations (5)

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