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
  • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
  • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
  • F25D11/025—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures using primary and secondary refrigeration systems

Definitions

• the invention relates to a refrigerator according to the preamble of claim 1.
• the refrigerator of the refrigerator usually consists of a cooling circuit for a refrigerant with a compressor, a condenser and an evaporator, which extracts the heat from the interior to be cooled and transfers to the refrigerant.
• the evaporator is designed as a wire tube evaporator and arranged in the freezer. The evaporator acts as a heat exchanger between the air in the interior and the refrigerant.
• wire-tube evaporators the refrigerant-carrying evaporator tube is bent into parallel loops. The pipe loops are firmly connected with wire rods - usually by spot welding - and thus stabilized.
• the wire rods run at parallel intervals at right angles to the straight pipe sections of the pipe loops at their top and bottom.
• the purpose of connecting the pipe loops carrying the refrigerant to the wire rods is to prevent sagging of the pipe loops on the one hand and to achieve a higher cooling capacity by increasing the surface area, on the other hand.
• an icemaker is provided in the refrigeration device, this can be connected, for example, to the Be connected cooling circuit of the refrigerator. Another possibility is to equip the ice maker with its own refrigerant circuit and to couple this thermally to the evaporator of the refrigerator.
• the invention has the object of providing a refrigeration device in such a way that the temperature required on the cooling fingers of a Klareishneers, without being affected by the temperature control of the refrigerator, can be maintained very constant.
• the necessary components must be inexpensive and must not greatly increase the manufacturing cost of the refrigerator.
• a refrigerant is used whose viscosity changes with the temperature in the relevant temperature range.
• a correspondingly sized throttle in the bypass line itself a pressure relief valve installed.
• the refrigerant flowing back from the cooling fingers of low temperature and therefore viscous only a small part flows through the throttle to the chiller.
• the pressure applied opens the pressure relief valve.
• the volume flow originating directly from the cooling fingers is mixed by the bypass line with the small volume flow from the cold generator and returned to the cooling fingers.
• a controllable device is provided with which the flow rates of refrigerant are controlled by the refrigerator and the bypass line. Furthermore, a temperature sensor is provided, which supplies the control condition for the control device.
• the controllable device is designed as a 3-way valve.
• Such 3-way valves are also known as “mixers” or “mixing valve”.
• the 3-way valve may, for example, be provided where the bypass line is guided together with a line coming from the cold generator. The two refrigerant streams can then be mixed together so that sets exactly the desired temperature on the temperature sensor.
• a 2-way valve is provided.
• This simple valve can be provided in the line to, or the line from the cold generator, but also directly in the bypass line.
• it is in the line that comes from the chiller at one point before this line is merged with the bypass line. In this way, only the volume flow of the Refrigerant regulated coming cold refrigerant. The volume flow through the bypass line adjusts accordingly.
• a second 2-way valve is provided in the bypass line.
• the 2-way valves can be designed in their simplest form so that only an open or closed position is possible.
• the valves can be clocked, for example, with a variable frequency. This means that either different fixed times are assigned to a fixed closed time, or different closed times to a fixed open time.
• the cold generator is formed in the cooling circuit of Klareiskers as a heat exchanger.
• This heat exchanger is thermally coupled to the evaporator of the refrigerator. Therefore, neither a refrigerant circuit with its own compressor, evaporator and condenser has to be provided for the overhead freezer, nor must the clearing machine be connected directly to the refrigerant circuit of the refrigeration device.
• a circulation pump is integrated into the cooling circuit.
• glycol and water As a refrigerant, a mixture of glycol and water has been found to be advantageous. This mixture can be adjusted so that it remains liquid in the required temperature range and is still inexpensive to produce.
• a heating device is provided in the cooling circuit of the clarifier. By activating this heater, the refrigerant can be heated so far that the generated clear ice dissolves from the cooling fingers and in a Collecting tray can be collected. As a result, a separate heating device can be saved on each individual cold finger.
• 1 shows an inventive refrigerator with freezer and icemaker
• Fig. 2 is a detail of a wire tube evaporator with coupled
• Fig. 3 shows a first embodiment of the refrigeration cycle of a Klareiskers
• Fig. 4 shows a second embodiment
• Fig. 5 shows another embodiment.
• FIG. 1 shows a refrigeration device 1 with an open door and an interior 11.
• the interior 1 1 is divided into a cooling space 2 and a freezer compartment 3.
• no closure flap is shown on the freezer compartment 3.
• a Klareis holeer 4 In the refrigerator 2 is a Klareisr 4. In this Klareisr 4 is in a process not further explained here by means of several cold fingers Klareis produced, which is stored in a drip tray 10.
• the collecting tray 10 is located below the clear ice maker 4.
• the cold required for the production of the clear ice is produced by means of a heat exchanger 5 (see also Fig. 2), which is fixedly connected to the cold fingers.
• the horizontally arranged wire tube evaporator 6 located in the freezer compartment 3 consists of an evaporator tube 7 bent into parallel loops.
• the evaporator tube 7 of the wire tube evaporator 6 is firmly connected to wire rods 8 on the upper and lower sides, which run parallel to the end side and to one another have the same distance.
• the attachment of the wire rods 8 causes on the one hand an increase in surface area, through which the heat from the freezer compartment 3 can be better absorbed, and on the other hand prevents sagging of the evaporator tube 7 of the wire tube evaporator 6.
• the heat exchanger 5 consists of a heat exchanger tube 9.
• the heat exchanger tube 9 of the heat exchanger 5 is also performed in the region of the wire tube evaporator 6 parallel to the evaporator tube 7 in loops in the same plane.
• the heat exchanger tube 9 of the heat exchanger 5 is just between the wire rods 8 as the evaporator tube 7 of the wire tube evaporator. 6
• the heat exchanger tube 9 of the heat exchanger 5 is fixedly connected to the evaporator tube 7 and the lower and upper wire rods 8 of the wire tube evaporator 6.
• the heat exchanger tube 9 of the heat exchanger 5 has the same outer diameter and consists of the same material as the evaporator tube 7 of the wire tube evaporator. 6
• thermally conductive compounds spot welding, soldering or gluing are possible.
• a coating in particular a powder coating, which is applied to the finished assembled construct of heat exchanger 5 and wire tube evaporator 6, sufficiently thermally conductive.
• Fig. 3 shows a first embodiment of the cooling circuit of the Klareisleers 4.
• the cooling circuit is filled in particular with a water-glycol mixture, which is inexpensive to produce and is liquid in the relevant temperature range.
• the refrigerant is in the heat exchanger 5 is cooled by the wire tube evaporator 6. With the help of the circulation pump 17, the refrigerant is circulated.
• the temperature sensor 13 In the circuit in front of the Klareisle 4 is the temperature sensor 13, is controlled by means of which, whether the refrigerant has the temperature required for the production of clear ice.
• the heater 14 is needed to dislodge the finished clear ice from the cold fingers of the clear ice maker so that it can be collected in the drip tray 10.
• the bypass line 18 is turned on in the cooling circuit, that refrigerant can be passed to the heat exchanger 5.
• About the return line 19 is refrigerant, which has already flowed through the Klareisle 4, fed back to the heat exchanger 5.
• the cold valve 12 is switched between the heat exchanger 5 and the bypass line 18 in the cooling circuit.
• the cold valve 12 is designed as a shut-off valve, which can only be controlled in a closed or an open position.
• the cold-valve 12 is clocked, that is closed at a certain frequency and opened again. The longer the closing times of the cold valve 12, the greater the partial flow through the bypass line 18.
• the closing times of the cold valve 12 can be reduced.
• the cold valve 12 may also be designed as a controllable valve. Such a valve need not be clocked because the opening cross-section of the valve is adjustable. With each position of the valve, therefore, a certain mixing ratio of the partial flows from the bypass line 18 and the heat exchanger 5 can be achieved.
• the heating device 14 is switched on. At the same time, the cold valve 12 is completely closed. The refrigerant is heated to a temperature just above 0 0 C and passed completely through the bypass line 18. As soon as the temperature in the clarifier 4 is above the O ° C limit, the ice which is in direct contact with the cold fingers melts and the finished clear ice falls into the drip tray 10.
• the bypass valve 15 is additionally switched into the bypass line 18. Regardless of whether the valves 12 and 15 are clocked or provided with a continuously variable flow cross-section, in this embodiment, the temperature of the refrigerant can be controlled faster and more direct, so that the desired temperature of the refrigerant can be maintained in the Klareisle 4 with lower fluctuations.
• a mixing valve 16 is used instead of the two valves 12 and 15. This mixing valve 16 is located where the partial flow from the heat exchanger 5 is combined with the partial flow from the bypass line 18. With the mixing valve 16, these partial flows can be controlled directly. In this way, the temperature of the refrigerant in the Klareisr 4 is very accurate and adjustable without fluctuation.

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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)
• Devices That Are Associated With Refrigeration Equipment (AREA)

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Citations (7)

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• 2006
  • 2006-12-22 DE DE102006061157A patent/DE102006061157A1/de not_active Withdrawn
• 2007
  • 2007-11-23 WO PCT/EP2007/062768 patent/WO2008077707A1/de active Application Filing
  • 2007-11-23 RU RU2009126097/21A patent/RU2447374C2/ru not_active IP Right Cessation
  • 2007-11-23 EP EP07822849.1A patent/EP2126486B1/de active Active
  • 2007-11-23 PL PL07822849T patent/PL2126486T3/pl unknown

Patent Citations (7)

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