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
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D29/00—Arrangement or mounting of control or safety devices
  • F25D29/005—Mounting of control devices
• • 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
  • F25B2339/023—Evaporators consisting of one or several sheets on one face of which is fixed a refrigerant carrying coil
• • 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
• • 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
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D2700/00—Means for sensing or measuring; Sensors therefor
  • F25D2700/10—Sensors measuring the temperature of the evaporator
• • 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 with a base plate, a pipe for a refrigerant fastened to the base plate and a sleeve arranged on the base plate for receiving a temperature sensor, and to a refrigeration device which is equipped with such a heat exchanger.
• a heat exchanger can be used in a refrigerator as a condenser, but in particular as an evaporator.
• a temperature sensor In order to control the operation of such an evaporator in a temperature-controlled manner, a temperature sensor is generally mounted on the evaporator and is connected to a thermostat control circuit. This thermostat control circuit switches the chiller on and off in such a way that the temperature detected by the temperature sensor remains in a target range.
• the temperature detected by the temperature sensor generally shows systematic deviations from the actual temperature of the evaporator and follows their changes with delay. These systematic deviations depend, among other things, on the thermal conductivity of the transition from the evaporator to the temperature sensor, on the distance of the temperature sensor from the refrigerant line of the evaporator, etc.
• the sleeve which is provided in order to accommodate the temperature sensor when the evaporator is installed in a refrigeration device must be in the same position with respect to those extending along the evaporator plate Have a refrigerant line.
• the reproducible positioning of the sleeve with respect to the course of the refrigerant line can be ensured in a simple manner by co-embossing a refrigerant channel and a channel for receiving a temperature sensor in one of the two sheets of such an evaporator to be fastened to one another.
• Such a technique is known for example from DE 39 28 471 C2.
• tube-plate evaporators ie to evaporators which are constructed from an evaporator plate, on the surface of which a pipe for the refrigerant is attached.
• evaporators it is possible to glue a channel for later accommodation of a temperature sensor, e.g. in the form of a sheet metal or plastic tube, but this cannot be done in one operation together with the attachment of the refrigerant tube, so that such a channel can be positioned in a reproducible manner with regard to the refrigerant pipe and thus a uniform control behavior is not easily guaranteed.
• Another possibility is to form a channel by rolling an edge section of the base plate into a channel for the temperature sensor.
• the position of the temperature sensor in relation to the base plate is fixed, but it is restricted to the fact that the temperature sensor can only be positioned at the edge of the base plate, i.e. in an area that is exposed to relatively strong disturbing thermal influences from the outside and its temperature thus allows only a limited conclusion about the average temperature of the base plate.
• the object of the present invention is to provide a heat exchanger for a refrigeration device in tube-plate technology, which allows reproducible positioning of a receiving sleeve for a temperature sensor in a simple manner and without the need for position measurement or adjustment.
• a heat exchanger having the features of claim 1. Since in this heat exchanger the sleeve of the surface of the evaporator plate is fixed by at least one strut engaging the pipe, the position of the sleeve is precisely defined at a distance from the pipe which corresponds to the length of the strut. The delay with which a temperature sensor installed in the sleeve registers heating or cooling of the refrigerant line is uniform for all series-produced evaporators with the same length of the strut.
• each strut has a clamp section for clamping on the pipeline. This enables a quick provisional fixation of the sleeve on the base plate; a definitive fixation, in particular by covering the side of the pipe and the sleeve carrying the Base plate through a cover layer or film, can be done at a later date.
• the sleeve and the at least one strut are formed in one piece, preferably from a blank made of a flat material such as, in particular, sheet metal.
• the strut is realized as a part separate from the sleeve and clamped on it.
• a strut can have, in particular, a first clamp section for clamping on the pipeline and a second clamp section for clamping on the sleeve.
• the sleeve is preferably assigned at least two struts.
• These two struts can extend in the same direction from the sleeve, in particular to engage a same straight pipe section running parallel to the sleeve, but they can also extend in opposite directions from the sleeve in order to engage two different ones to attack on both sides of the sleeve extending sections of the pipeline.
• the pipeline bears a marking at the point of application of at least one strut.
• a marking can be, in particular, a notch or indentation which has been pressed into the pipeline at a predetermined location in the course of the fastening of the pipeline to the evaporator plate, and into which the clamp section of the strut can snap, so that it can engage against slipping in the longitudinal direction of the pipeline is ensured.
• the pipeline and the sleeve can be connected to the evaporator plate in a simple manner by means of an adhesive layer.
• the pipeline and the sleeve are preferably enclosed between the evaporator plate on the one hand and a film of deformable material such as bitumen, plastic material or aluminum on the other hand.
• Fig. 1 is a perspective view of an evaporator according to a first
• FIG. 2 shows a section along the line II-II from FIG. 1;
• Fig. 3 is a perspective view of the built in the evaporator of Fig. 1
• FIG. 4 shows a view analogous to FIG. 1 of a second embodiment of an evaporator according to the invention
• Fig. 5 is a section along the line V-V of Fig. 4;
• Fig. 6 is a perspective view of the sleeve used in the embodiment of Fig. 4.
• FIG. 7 is a perspective view of a modification of the sleeve from FIG. 6.
• the heat exchanger shown in FIG. 1 as a evaporator for a refrigeration device is constructed from a flat base plate 1 made of aluminum sheet, on which a refrigerant line 2 made of a tube also made of aluminum is arranged in a meandering shape.
• the base plate 1 and the refrigerant line 2 are covered by a holding material layer 3, which consists, for example, of a mixture of bitumen, additives for setting a desired heat capacity and / or thermal conductivity of the holding material layer 3 and possibly other additives influencing the processability of layer 3.
• the holding material layer 3 could also consist of a plastic material such as polyethylene, possibly with appropriate additives, or of a strong aluminum foil.
• the holding material layer 3 extends into the gussets 4, which are located on both sides of the contact line between the refrigerant line 2 and the base plate 1, and thus contributes significantly to efficient heat transfer between the base plate 1 and the refrigerant line 2 at.
• the refrigerant line 2 has a flattened elliptical cross section, which e.g. can be obtained by pressing an originally round refrigerant line after laying on the base plate 1 or during laying on this.
• a layer 5 made of a hot-melt adhesive which is only recognizable as a line in the figure because of its much smaller thickness compared to the base plate 1 and the holding material layer 3.
• a channel 6 for receiving a temperature sensor is arranged in a space between two parallel sections of the refrigerant line 2 parallel to the latter.
• the channel 6 is formed by a sleeve 7 rolled from a sheet metal blank, which is shown in section in FIG. 2 and in a perspective view in FIG. 3.
• the sheet metal blank from which the sleeve 7 is formed has the shape of a double Ts (or the Greek letter ⁇ ), the crossbars of the two Ts being rolled up to the sleeve 7 and the legs forming two struts 8 which form the sleeve 7 in one Keep the predetermined distance to a section of the refrigerant line 2 parallel to this.
• the struts 8 each have a rectilinear intermediate section 10, which adheres to the hot-glue layer 5 when the heat exchanger is fully assembled, and to this subsequently a clamp section 9 in the form of an inverted U, the two legs of which are clamped onto the refrigerant line 2 and thereby elastically deformed.
• This shape of the sleeve 7 allows it to be removed from the refrigerant line 2 when the heat exchanger is assembled at a fixed distance determined by the length of the intermediate section 10 place without having to take expensive measures.
• the clamp section 9 provides a temporary hold of the sleeve 7 on the circuit board during assembly before the holding material layer 3 has been placed and the hot-melt layer 5 has been heated in order to connect the holding material to the base plate 1.
• a provisional retention of the sleeve 7 on the refrigerant line 2 can of course also be achieved with a single strut 8. If the width of such a single strut were the same as the distance between the two opposite longitudinal edges of the struts 8 in FIG. 3, the same accuracy of the parallel alignment of the sleeve 7 to the refrigerant line 2 could be achieved as with two struts. Nevertheless, the use of two parallel struts 8 is preferred since the holding material layer 3 can be glued to the hot-melt layer 5 in the space between the two struts 8.
• two depressions are preferably pressed into it on its side facing away from the base plate 1, the width of which corresponds to the width of a strut 8 and the distance from one another is the distance between the two Struts 8 correspond to each other. These two depressions can serve as a reference for the placement of the sleeve 7.
• FIGS. 4 to 6 A second embodiment of the heat exchanger according to the invention is shown in FIGS. 4 to 6 explained, each of the Figs. 1 to 3 show analog views.
• the sleeve 7 is clamped to the refrigerant line 2 with the aid of two struts 8, but the two struts 8 extend from the sleeve 7 in opposite directions and engage two mutually parallel sections of the refrigerant line 2.
• the structure of the struts 8 with the intermediate piece 10 and the clamp section 9 is the same as in the first embodiment.
• the clipping on two parallel sections of the refrigerant line 2 at the same time prevents the sleeve 7 from loosening again in the course of the assembly if the base plate 1 is tilted before the sticking.
• FIG. 7 A variant of this second embodiment is shown in FIG. 7.
• the sleeve 7 and the struts 8 are not bent in one piece from sheet metal, but the sleeve is formed by a tube piece 11 which is held against the board 1 by a spring sheet metal strip 12, in which the two are attached the struts 8 attacking the refrigerant line 2 are formed.
• the length of the sleeve depends on the length of a temperature sensor to be accommodated in it; this is usually approx. 160 mm.
• the assembly of the heat exchanger is largely the same in the three considered configurations.
• a film is placed on the arrangement of the circuit board 1, the refrigerant line 2 and the sleeve 7, which is provided to form the holding material layer 3.
• the film is pressed against the hot-melt layer 5 and at the same time heated to activate the hot-melt adhesive and so the film as well to glue the intermediate pieces 10 of the struts.
• the material of the film softens and has a sufficient thickness at the activation temperature of the hot-melt layer 5
• hydrostatic pressure can be exerted on the film to cause material of the film to enter the gusset 4 between the refrigerant line 2 and the circuit board 1 penetrate.
• a stamp can also be used to press the film, which is shaped in such a way that it tears the film at one end of the sleeve.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
• Devices That Are Associated With Refrigeration Equipment (AREA)
• Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
• Supports For Pipes And Cables (AREA)

Applications Claiming Priority (3)

Publications (2)

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Family Applications (1)

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• 2002
  • 2002-11-11 DE DE10252345A patent/DE10252345A1/de not_active Withdrawn
• 2003
  • 2003-11-06 AU AU2003276269A patent/AU2003276269A1/en not_active Abandoned
  • 2003-11-06 AT AT03810972T patent/ATE385560T1/de not_active IP Right Cessation
  • 2003-11-06 DE DE50309133T patent/DE50309133D1/de not_active Expired - Lifetime
  • 2003-11-06 ES ES03810972T patent/ES2300656T3/es not_active Expired - Lifetime
  • 2003-11-06 CN CNA2003801030470A patent/CN1711454A/zh active Pending
  • 2003-11-06 WO PCT/EP2003/012424 patent/WO2004044507A1/fr active IP Right Grant
  • 2003-11-06 EP EP03810972A patent/EP1563236B1/fr not_active Expired - Lifetime
  • 2003-11-06 US US10/534,204 patent/US20060124274A1/en not_active Abandoned
  • 2003-11-06 PL PL03375188A patent/PL375188A1/xx not_active Application Discontinuation

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