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

Definitions

• the invention relates to an evaporator arrangement with at least two evaporators of different cooling capacities arranged in series, which are charged with refrigerant by a compressor via an injection point, the evaporator with lower cooling capacity being designed like a plate, while the evaporator with higher cooling capacity is equipped with a pipeline that serves to guide the refrigerant and the evaporator with lower cooling capacity is connected in series.
• Evaporators of this type have a carrier plate which is angled to form a rectangular tube and which is wrapped on its jacket surface with a pipeline which serves to guide refrigerant.
• the carrier plate and the pipeline are made of aluminum for the sake of processing simplification and heat conduction as well as for cost reasons, with an intermediate pipe section being fixed by welding at the inflow-side end of the pipeline, which serves to adapt the material of a throttle line made of copper, which is soldered to the intermediate pipe section.
• the outflow-side end of the pipeline is connected to an evaporator board which serves to cool the cooling compartment and is manufactured, for example, by means of the roll bond process, at which on the outflow side a connection point is provided with an aluminum pipe section fixed therein, which in turn is welded to a suction pipe usually formed from a copper pipeline.
• Such an upstream connection of an evaporator board serving as a cooling compartment evaporator with a so-called tube evaporator used in a freezer compartment has, in addition to a large number of individual components, also the result that different materials are to be connected to one another in a liquid-tight and gas-tight manner as a result of cost and production, so that special welding processes such as, for example a special type of electrical resistance welding must be used, for which a suitable welding device is quite expensive.
• the assembly effort of such an evaporator arrangement is relatively high due to the large number of individual connection points to be joined, whereby additional high demands are placed on the workforce in terms of their work quality and work quality in order to be able to ensure that the connection points are made liquid and gas tight.
• the object of the invention is to simplify and improve the refrigeration interconnection of the two individual evaporators with one another in an evaporator arrangement according to the preamble of claim 1 using simple structural measures.
• the board-like evaporator of lower cooling capacity has a section which is equipped with the injection point for the refrigerant and which is at least largely thermally decoupled from the remaining board surface of the evaporator.
• the copper pipeline used to inject the liquid refrigerant can be introduced into a refrigerant channel produced using the roll-bond or Z-bond method and can be fixed by non-cutting deformation of the refrigerant channel, for example by embossing, in a liquid and gas-tight manner, without producing the Injection point for the refrigerant to have to provide a mechanically complex and therefore costly welding process.
• the purely mechanical seal by deforming the refrigerant channel molded into the circuit board has the advantage that the shape and position tolerances between the connection partners can be chosen larger than would be possible with a welded connection to be carried out between the connection partners.
• the section has a refrigerant channel which adjoins the injection point and which has a connection area for the pipeline on the outlet side.
• a particularly rapid and targeted supply of the injected refrigerant into the pipeline of the evaporator of higher refrigeration capacity results if, according to a next preferred embodiment of the object of the invention, it is provided that the refrigerant channel is designed to be length-minimized on the section. Furthermore, unnecessary cold losses at the evaporator with lower cooling capacity are avoided.
• the section is connected to the remaining board surface of the evaporator by at least one web-like connecting section, via which the drain-side end of the refrigerant channel arrangement on the remaining board surface is guided at least into the vicinity of the injection point.
• the supply of the drain-side end of the refrigerant channel arrangement on the remaining board surface ensures an inexpensive and inherently tight connection of this refrigerant channel arrangement to the suction pipe of the refrigeration cycle.
• the section and the remaining board surface of the evaporator of lower cooling capacity are particularly easy to manufacture if, according to a next advantageous embodiment of the subject of the invention, it is provided that the web-like connecting section is made in one piece with the section and in one piece with the remaining board surface of the stampfers is connected.
• the one-piece connection of the section to the residual board area of the evaporator results in a particularly exact position assignment of the former to the latter.
• the board-like evaporator with lower cooling capacity and the section can be produced in one piece by cutting out from an aluminum sheet board.
• the residual circuit board surface of the evaporator is arranged within the thermal insulation of a refrigeration device and is coupled in a heat-conducting manner to an inner lining of a cold room provided in the refrigeration device, while the section lies outside the thermal insulation.
• the evaporator is designed with a higher cooling capacity than a box-shaped evaporator with a support plate formed into a tube and a pipeline wound thereon in thermally conductive contact.
• This provides a particularly inexpensive variant for a freezer compartment evaporator.
• the pipeline can be coupled in a particularly gas-tight and liquid-tight manner to the refrigerant channel arrangement of the plate-like evaporator if, according to a last preferred embodiment of the subject of the invention, it is provided that the pipeline on the outflow side via a connection point on the evaporator plate to the refrigerant channel arrangement of the remaining plate surface of the evaporator connected is.
• Fig. 1 shows an evaporator arrangement, formed from a freezer compartment evaporator and a cooling compartment evaporator arranged in series with an injection point arranged on a thermally at least largely decoupled evaporator section, in a spatial view from behind and
• Fig. 2 shows the evaporator arrangement in a view from behind.
• FIG. 1 shows a simplified, schematic illustration of an evaporator arrangement 10 with a freezer compartment evaporator 11, which has a support tube 12, for example formed from an aluminum sheet, on the jacket surface 13 of which is facing the thermal insulation of a refrigeration device, a pipe 14 used to guide refrigerant is applied, which is provided at both ends with a connector 15 or 16 and which consists of an aluminum tube which is fixed in heat-conducting contact on the outer surface 13.
• the former is provided on its free surface with an aluminum-coated adhesive tape which is fixed on the jacket surface 13 of the carrier tube 12.
• the backing of the support tube 12 is equipped with a rear wall 18 made of aluminum sheet, which together with the support tube 12 and the pipeline 14 wound thereon forms the freezer compartment evaporator 11 referred to as a box evaporator.
• a purely schematically illustrated refrigerator compartment evaporator 19 for example manufactured using the roll bond method
• the circuit board-like structure produced by welding two aluminum sheet metal plates has a first circuit board section 20, which is designed as a so-called cold wall evaporator and has a meandering refrigerant channel arrangement 21, which is attached to it the upstream end opens into a connection point 22 which is also molded onto the circuit board section 20 and which has a channel section 23 at its outflow end.
• the web-like connecting sections 25 are connected both in one piece to the circuit board section 20 and in one piece with a second circuit board section 26 belonging to the refrigerator compartment evaporator 19, which in terms of dimensioned its surface significantly smaller than the surface of the circuit board section 20 and which is essentially rectangular in shape, the connecting sections 25 being connected to one of its longer rectangular sides.
• the circuit board section 26 is equipped with a refrigerant channel 27 running parallel to its longer rectangular sides, which runs over the entire length of the circuit board section 26 and which has at its inflow-side end a connection point 28 which is integrally formed on the circuit board section 26 and at its drain-side end also at the Board section 26 is provided with integrally formed connection point 29 for the introduction of pipelines explained in more detail below.
• the coolant channel 27 serves to receive a throttle pipeline 30, for example made of copper, which is fixed gas-tight and liquid-tight in one end by means of a partial, plastic deformation with the formation of a so-called embossing point 31 in the coolant channel 27 , the free end of the throttle tube 30 serving as an injection point 32 for the liquid refrigerant.
• a connection point 34 is provided for the channel section 23 guided via the connecting section 25 to the refrigerant channel 27.
• the refrigerant channel 27 opens out on the outlet side in the connection point 29, in which a connecting tube 35 made, for example, of aluminum is welded, which is welded to connect the refrigerant channel 27 to the pipeline 14 with its connecting piece 15 provided on the inflow side.
• the connection piece 16 provided on the outflow side on the pipeline 14 serves to receive an intermediate pipe 36, also made of aluminum, which is welded on the one hand to the connection piece 16 and on the other hand to the connection point 22 on the circuit board section 20.
• the refrigerant which is forcibly circulated by a refrigerant compressor (not shown) in the liquid state, is fed via the throttle tube 30 to the injection point 32, which in terms of refrigeration technology should actually be assigned to the freezer-compartment evaporator 11 and which, without noticeable loss of cold, is formed over a short refrigerant flow path, formed from the Refrigerant channel 27 and the connecting pipe 34 is upstream.
• the refrigerant symbolically indicated by the arrows, flows via the refrigerant channel 27, the connecting pipe 34 into the pipeline 14 of the freezer compartment evaporator, where it flows at the outlet end thereof via the intermediate pipe 36 into the downstream cooling compartment evaporator 19. There it flows through its refrigerant channel arrangement 21 before the refrigerant passes through the channel section 23 at the connecting section 25 into the suction pipe 33.
• box-like freezer compartment evaporator 30 is designed as a so-called wire tube evaporator with evaporator shelves arranged at different heights.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Devices That Are Associated With Refrigeration Equipment (AREA)
• Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
• Semiconductor Memories (AREA)
• Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (9)

Cited By (3)

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Citations (7)

• 1997
  • 1997-12-22 DE DE29722661U patent/DE29722661U1/de not_active Expired - Lifetime
• 1998
  • 1998-12-18 CN CNB988124920A patent/CN1157583C/zh not_active Expired - Lifetime
  • 1998-12-18 PL PL341234A patent/PL190948B1/pl not_active IP Right Cessation
  • 1998-12-18 RU RU2000119776/06A patent/RU2185577C2/ru active
  • 1998-12-18 BR BR9814362-0A patent/BR9814362A/pt not_active IP Right Cessation
  • 1998-12-18 WO PCT/EP1998/008359 patent/WO1999032839A1/de active IP Right Grant
  • 1998-12-18 TR TR2000/01764T patent/TR200001764T2/xx unknown
  • 1998-12-18 DE DE59804098T patent/DE59804098D1/de not_active Expired - Lifetime
  • 1998-12-18 ES ES98966381T patent/ES2177133T3/es not_active Expired - Lifetime
  • 1998-12-18 EP EP98966381A patent/EP1042638B1/de not_active Expired - Lifetime

Patent Citations (7)

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