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
  • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
• • 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
  • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
• • 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
  • F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more evaporators
• • 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
  • F25B2600/00—Control issues
  • F25B2600/25—Control of valves
  • F25B2600/2511—Evaporator distribution valves
• • 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
  • F25D2700/12—Sensors measuring the inside temperature
• • 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
  • F25D2700/12—Sensors measuring the inside temperature
  • F25D2700/122—Sensors measuring the inside temperature of freezer compartments

Definitions

• the present invention relates to a refrigerator for a combination domestic refrigeration appliance, i. for a refrigeration device with at least two storage compartments, which can be kept at different temperatures, as well as the refrigeration device itself.
• chillers for such combination refrigerators known.
• a compressor, a freezer compartment evaporator and a standard refrigeration compartment evaporator are connected in series in a single refrigerant circuit.
• This type of chiller works with a very simple control, in which, as with conventional refrigerators with a single compartment by a
• Temperature sensor controlled electromechanical switch such as a bimetallic element is attached to one of the compartments to close a supply circuit of the compressor when the temperature in the compartment exceeds a predetermined limit.
• a chiller allows only the simultaneous cooling of both compartments, and independent control of the temperature in both compartments is not possible.
• a second type of combination refrigerator includes independent of each other
• Refrigerators for normal refrigerated and freezer This type therefore allows an independent temperature control of both subjects and achieves a very good
• Standard refrigerated compartment evaporator supplied.
• an electronic circuit is used, which continuously, even if the switching valve is not switched, generates a power loss that affects the overall efficiency of the device.
• the abandonment of such a circuit could both the
• the aim of the present invention is therefore to provide a refrigeration machine for a combination refrigerator, which allows independent temperature control of different subjects and their control without constantly consuming energy-consuming electronic components or their energy consumption in a dormant state in which the Operation of the chiller is not changed, at least substantially less than at times when the controller intervenes to the operating state of
• the object is achieved by connected in a refrigerator for a combination refrigerator such as a domestic refrigerator-freezer with a compressor, at least two connected in parallel with an electrically controlled multi-stable switching valve and selectively acted upon by the switching valve with refrigerant
• the switching valve is electrically connected in parallel with the compressor. As long as the compressor is switched off and the current-controlled switch is de-energized, the latter is permeable. Thus, when switching on the compressor and the switching valve is energized first and thereby can change its switching state. If after a short time the current-controlled switch responds, it interrupts the flow of current through the switching valve, so that there is essentially no
• the first current-controlled switch is connected in series with a diode in order in each case to pass only a half-wave of an applied alternating voltage and to apply the switching valve with a unipolar voltage whose sign defines the switching direction of the switching valve.
• a series circuit of a second current-controlled switch and a second diode is connected in parallel to the series connection of the first current-controlled switch and the first diode, wherein the second diode is polarized antiparallel to the first.
• a first controlled by a temperature sensor switch with an input terminal and two each alternatively with the input terminals
• each of the output terminals is connected to one of the series circuits of a current-controlled switch and a diode.
• this temperature is the temperature of a compartment of a refrigerator, can be determined depending on this temperature, whether the switching valve, an evaporator of this compartment supplied with refrigerant or the evaporator of the
• auxiliary winding As drive units of refrigerators electric motors are common, which comprise a main winding and an auxiliary winding, wherein the auxiliary winding is to be acted upon in a start-up phase of the motor with power to specify a running direction of the motor, or to ensure a start of the motor, even if this is in an equilibrium position with respect to the electromagnetic forces generated by the main winding.
• the auxiliary winding In order to apply power to the auxiliary winding only in the starting phase of the motor, it may also be associated with a current-controlled switch.
• the current-controlled switch via which the auxiliary winding can be supplied with current, is identical to the first current-controlled switch.
• the current-controlled switch supplying the auxiliary winding may also be a third different from the aforementioned switches
• current-controlled switch and the auxiliary winding is connected in parallel to the switching valve.
• current-controlled switches can be used, each with an ideal adaptation to the properties, in particular power and switching times, of the auxiliary winding or of the switching valve.
• the amount of current required to switch the switching valve is generally low, and many types of current-controlled switches do not switch at currents greater than the switching current of the switching valve. In order to use such types of current-controlled switches, it is appropriate to a
• Compressor and switching valve are preferably connected in parallel to each other electrically and together with a second controlled by a temperature sensor switch in Connected series.
• This second switch controlled by a temperature sensor can be provided on a second compartment of a combination refrigerator in order to
• the current-controlled switches can be real PTC thermistors whose conductivity is temperature-dependent and which are heated by a current flowing through them, so that the conductivity also depends indirectly on the current; however, it is also possible to use electronic components, for example based on triacs, which simulate the current-dependence of the conductivity of such a PTC thermistor, without necessarily having the temperature-conductivity characteristic of the PTC thermistor.
• both the first controlled by a temperature sensor switch on a colder and the second controlled by a temperature sensor switch can be arranged on a warmer of two compartments of the refrigerator, as well as vice versa.
• one will generally attach the second temperature-controlled switch to the compartment which has more frequent cooling requirements so that, when cooling demand occurs, the compressor's start-up will not be unnecessarily delayed. It is also expedient if at least a part of the evaporator of the compartment to which the second switch controlled by a temperature sensor is mounted, and the evaporator of the compartment to which the first switch controlled by a temperature sensor is mounted, are flowed through in series of refrigerants.
• Fig. 1 is a schematic representation of the refrigerator of a
• Fig. 2 is a block diagram of the electrical components of
• Refrigerating machine according to a first embodiment
• FIG. 3 is a block diagram of the electrical components according to a second embodiment.
• FIG. 4 is a block diagram of the electrical components according to a third embodiment of the invention.
• Fig. 1 shows schematically a refrigerator of a household refrigerating appliance with a freezer compartment 1 and a normal refrigeration compartment 2.
• the subjects 1, 2 are associated with evaporator 3 and 4 respectively.
• Injection points 5, 6 of the evaporator 3, 4 are connected to one output of a bistable solenoid valve 7.
• Normal cooling compartment 2 is connected to an input of the evaporator 3 of the freezer compartment 1, so that together with the evaporator 4, the evaporator 3 is always cooled.
• the evaporator 3 can be provided largely separate lines for injected at the injection point 5 refrigerant and for the refrigerant originating from the evaporator 4, which meet only in the vicinity of an outlet of the evaporator 3, or it can essentially a single line on the
• Evaporator 3 may be provided, in which the refrigerant from the evaporator 4 opens shortly after the injection point 5.
• Injection point 5 or the injection point 6 is supplied.
• a controlled by a temperature sensor 22 switch 10 or 1 1 is mounted (see Fig. 2).
• a temperature sensor 22 and at the same time as a movable element of the switch 10, 1 1 can serve a bimetallic element; but it can also be sensor 22 and switch 10, 1 1 spatially separated by about an electronic sensor is mounted as a temperature sensor 22 to a tray 1 or 2 and as a switch 10, 1 1 driven by a measuring signal of the sensor
• Normal cooling compartment 2 is arranged, but a reverse placement would also be possible.
• a source of AC supply voltage 12 a main winding of a motor of the compressor 8 with 13, an auxiliary winding with 14, two diodes 15 and 16 and PTC resistors with 17, 18 and 19 respectively.
• the switch 10 closes, and the supply voltage from the source 12 is applied to the main winding 13 and the series connection of the auxiliary winding 14 with the PTC 17 at.
• the PTC 17 is initially conductive, so that a current pulse through the
• Auxiliary winding 14 flows, which can start the engine of the compressor 8 reliably.
• Switch 1 1 depends. If the temperature of the normal cooling compartment 2, which is exposed to the switch 1 1, is above a threshold set at the switch 1 1, there is
• the resistance value of the PTCs is typically about 50 ⁇ in the transient state and about 100 k ⁇ in the off state.
• Evaporator 3 is supplied with refrigerant alone. Again, a short time of current flow is sufficient to put the PTC 19 in the blocking state and to bring the current flow through the solenoid valve 7 substantially to a standstill.
• the solenoid valve 7 in the energized state typically has a power of about 10 W, corresponding to a current consumption of almost 50 mA, when the voltage of the voltage source 12 is 220 V. Such current is low compared to the switching currents of most PTCs available on the market.
• a load resistor 20 as shown in dashed lines in Fig. 2, be connected in parallel to the solenoid valve 7. The influence of the power loss of the resistor 20 on the efficiency of the entire refrigerator is negligible, since the resistor 20 is energized only as long as the PTCs 18, 19 need to switch, typically 100 to 200 ms long.
• FIG. 3 shows a modified block diagram in which the number of PTCs is reduced by one compared to FIG. Same components are in Fig. 3 with the same Reference numbers as shown in Fig. 2 and will not be described again. The essential difference between the two embodiments is that in Fig. 3 the
• Auxiliary winding 14 is offset to the occupied in Fig. 2 by the load resistor 20 space.
• the current consumption of the parallel circuit of solenoid valve 7 and auxiliary winding 14 is sufficient to ensure a safe switching of the PTCs 18, 19, even if they are used for these common types with a tripping current of 100 mA or above.
• a disadvantage of this variant is in comparison to FIG. 2 enlarged power loss, as induced by the operation of the compressor 8 in the auxiliary winding 14 voltages can drive a current flow through the solenoid valve 7 even when the solenoid valve 7 through the switch 1 1 and the PTCs 18, 19 is disconnected from the voltage source 12.
• a load resistor 21 is provided parallel to the solenoid valve 7.
• this load resistor 21 as in the case of the resistor 20, it may be a simple ohmic resistance, but the use of a PTC is also conceivable. The latter is particularly useful to prevent switching of the switch 1 1, that when the compressor 8 is running, a switch-on pulse is applied to the auxiliary winding 14, which could interfere with the running of the compressor motor.
• a PTC 21 should be slower than the PTCs 18, 19 to ensure that current flow through the auxiliary winding 14 does not prematurely begin when the compressor motor starts up

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Devices That Are Associated With Refrigeration Equipment (AREA)

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Applications Claiming Priority (2)

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Citations (3)

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• 2010
  • 2010-02-01 DE DE102010001458A patent/DE102010001458A1/de not_active Withdrawn
• 2011
  • 2011-01-21 RU RU2012134985/06A patent/RU2012134985A/ru not_active Application Discontinuation
  • 2011-01-21 CN CN2011800078655A patent/CN102741625A/zh active Pending
  • 2011-01-21 EP EP11701787A patent/EP2531784A1/de not_active Withdrawn
  • 2011-01-21 WO PCT/EP2011/050810 patent/WO2011092116A1/de active Application Filing

Patent Citations (3)

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