EP0052323A2 - Dégivrage selon les besoins de réfrigérateurs - Google Patents

Dégivrage selon les besoins de réfrigérateurs Download PDF

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Publication number
EP0052323A2
EP0052323A2 EP81109577A EP81109577A EP0052323A2 EP 0052323 A2 EP0052323 A2 EP 0052323A2 EP 81109577 A EP81109577 A EP 81109577A EP 81109577 A EP81109577 A EP 81109577A EP 0052323 A2 EP0052323 A2 EP 0052323A2
Authority
EP
European Patent Office
Prior art keywords
defrosting
defrost
melting time
intervals
counter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP81109577A
Other languages
German (de)
English (en)
Other versions
EP0052323A3 (fr
Inventor
Gerd Böckmann
Ulrich Joest
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde GmbH
Original Assignee
Linde GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of EP0052323A2 publication Critical patent/EP0052323A2/fr
Publication of EP0052323A3 publication Critical patent/EP0052323A3/fr
Withdrawn legal-status Critical Current

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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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control

Definitions

  • the invention relates to a method for defrosting the beginning of frost on evaporators of refrigeration appliances, in which defrosting takes place automatically in defrosting intervals, the start and duration of which are each fixed in advance.
  • a defrosting process is initiated by a signal from the time switch turning on a defrosting device, for example a heater or fan (for example DE-OS 28 21 580), which keeps the temperature on the evaporators at a predetermined level above 0 ° for as long Hold the C value and defrost the frost base as the time switch is set to "defrost".
  • a defrosting device for example a heater or fan (for example DE-OS 28 21 580)
  • the defrosting process can be carried out unnecessarily if, in fact, no frost has developed yet, but the time switch is already set to "defrost".
  • the predetermined duration of the defrosting process is not sufficient to melt the entire frost on the evaporators, ie the defrosting process is ended too quickly.
  • the object of the present invention is therefore a safe. res and energy-saving process for defrosting the frost on evaporators of refrigeration cabinets.
  • This object is achieved in that the predetermined defrost intervals are released only as many as the defrost requirement.
  • the melting time is dependent on the temperature of the evaporator, i.e. determined by the temperature persistence in the 0 ° C range. ;
  • a certain number of defrost intervals are set on the replacement timer.
  • the duration of such a defrost interval is also determined by empirical values or by a measured maximum melting time. Is the time of temperature persistence measured in this defrosting process in the 0 ° C If the area is longer than the running time of the melting time counter, the next defrost is already released. In this way, the number and the sequence of the defrost intervals released from the predefined defrost intervals are determined as a function of the melting time and thus of the thickness of the ripening batch.
  • the method according to the invention thus reduces the number of defrosts to a minimum and is therefore much more cost-effective and energy-saving than the conventional methods, since unnecessary defrosting operations are avoided.
  • a device for carrying out the method according to the invention has an exchange timer, a defrost and a melting time counter, which are connected to a relay via gate outputs, the relay releasing a defrost signal to a defrost device.
  • thermostats are used to measure the melting time, and are arranged at various points on the evaporator so that the longest melting time can be measured. Depending on the duration of this melting time, the next, the next but one and fourth defrosts etc. are then released on the melting time counter.
  • an overflow lock is provided.
  • the defrost and the melting time counter each have an alpha-numerical display and the melting time counter also has a light-emitting diode. With the help of these ads can directly which defrost interval is released next and in which defrost interval the defrost counter is located.
  • the device according to the invention can have an external closer for initiating a manually controlled defrosting process.
  • the method according to the invention can be used with particular advantage in refrigerated and deep-freeze furniture.
  • an exchange timer 1 is shown, which is connected to an electronic selection circuit 3 via a defrost counter 2.
  • a thermostat 4 is also connected to the electronic selection circuit 3 via a timer 5, an overflow lock 6 and a melting time counter 7.
  • a relay 8 with a delay circuit 16 is also connected to this selection circuit 3 and is connected via a line 9 to a defrosting device (not shown). The mode of operation of this circuit is explained with reference to FIG. 2.
  • FIG. 1 The circuit arrangement described in FIG. 1 is shown in more detail in FIG. 2 and is supplemented by a pulse generator 10, which is connected to the two counters 2 and 7, and an external switch 11, which is connected to the defrost counter 2.
  • the H serves al tezeit the temperature curve in the 0 ° C region, so the melting time.
  • the thermostat 4 which is representative of several thermostats arranged in parallel, measures the holding time of the temperature curve of the environment of the evaporator in the 0 ° C. range.
  • the thermostats 4 which are interlocked by means of a replacement plug, switch on the timer 5, which converts the melting time into time pulses.
  • the overflow lock 6 prevents feedback from the counter 7 to the timer 5 incorrect counts due to defective thermostats.
  • the time pulses from the timing element 5 are fed to the melting time counter 7, where they are counted and stored.
  • Defrost intervals are set on the time switch 1 based on experience, the duration of which is also determined by experience or by measuring a maximum melting time, which is given by the duration of a complete melting of the frost on the evaporators of refrigeration appliances. The number of these defrost intervals is counted in the defrost counter 2.
  • the defrost clock thus provides the switching times that are counted and stored in the defrost counter 2.
  • the defrost counter is designed as a ring counter and counts max. 4 steps continuously.
  • Both the defrost counter 2 and the melting time counter 7 are coupled to one another via a selection circuit 3 in such a way that a defrosting process is initiated only when the pending signals match according to a selection to be explained in more detail via the relay 8 and line 9. Defrosting itself can be done by heating the evaporator or by supplying warm air with a fan, etc.
  • the delay circuit 16 arranged in front of the relay 8 prevents the relay from briefly picking up when the supply voltage is switched on.
  • the two counters 7 and 2 are then reset by the pulse generator 10, so that a new corresponding state can be set with each defrost.
  • the counter 2 can be switched via an external make contact 11 so that the next defrost signal is inevitably switched through.
  • the number and sequence of defrost intervals are selected using the time selection described below.
  • the duration of the melting time is determined by the external evaporator thermostat 4, which switches on in the 0 ° C. range at the beginning of the temperature persistence and switches off after the temperature persistence has ended. Several thermostats can be connected in parallel so that the longest melting time is measured.
  • the melting time is divided in the timer 5 into time units to be explained in more detail, which are counted and stored in the melting time counter 7.
  • the positions of the melting time counter 7 and the defrost counter 2 can be shown with an alpha-numerical display 13 or make 12 visible.
  • the display 12 shows the status of the defrost counter 2 from 1 to 4. This counter counts the defrosts specified by time switch 1, maximum 4 defrosts.
  • the display 13 shows the status of the melting time counter 7 with the numbers 0 to 9 and the letters A to F, as shown in FIG.
  • the melting time is longer than the time through which the display runs, it goes out and an overflow diode 14 lights up.
  • the time period from the lighting up of a digit to the lighting up of the next higher digit is a unit of time. This unit of time can be adjusted within limits using an adjustment button, not shown.
  • the melting time counter 7 is reset to 0 and the defrost counter 12 to 1.
  • the melting time counter 7 begins to count the time units and stores the counter status at the end of the melting time.
  • the defrost counter 2 is set to "3" and thus the next defrost is released, since every fourth defrost is forcibly released due to the circuit.

Landscapes

  • 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)
  • Defrosting Systems (AREA)
EP81109577A 1980-11-18 1981-11-09 Dégivrage selon les besoins de réfrigérateurs Withdrawn EP0052323A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3043459 1980-11-18
DE19803043459 DE3043459A1 (de) 1980-11-18 1980-11-18 Bedarfsabtauung der kuehlmoebel

Publications (2)

Publication Number Publication Date
EP0052323A2 true EP0052323A2 (fr) 1982-05-26
EP0052323A3 EP0052323A3 (fr) 1982-09-22

Family

ID=6117044

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109577A Withdrawn EP0052323A3 (fr) 1980-11-18 1981-11-09 Dégivrage selon les besoins de réfrigérateurs

Country Status (2)

Country Link
EP (1) EP0052323A3 (fr)
DE (1) DE3043459A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2593590A1 (fr) * 1986-01-24 1987-07-31 Thermo King Corp Unite mobile de refrigeration a commande de degivrage
EP0278701A3 (en) * 1987-02-06 1989-10-04 York International Ltd Improvements in or relating to defrosting of heat exchangers
EP0372595A1 (fr) * 1988-11-09 1990-06-13 Contronics Holland B.V. Installation commandant le dégivrage d'un dispositif frigorifique

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851100A (en) * 1955-10-17 1958-09-09 Penn Controls Defrost control
US3965692A (en) * 1974-11-15 1976-06-29 Friedrich Refrigerators Inc. Refrigeration control circuit
US4173871A (en) * 1977-12-27 1979-11-13 General Electric Company Refrigeration apparatus demand defrost control system and method
US4251988A (en) * 1978-12-08 1981-02-24 Amf Incorporated Defrosting system using actual defrosting time as a controlling parameter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2593590A1 (fr) * 1986-01-24 1987-07-31 Thermo King Corp Unite mobile de refrigeration a commande de degivrage
EP0278701A3 (en) * 1987-02-06 1989-10-04 York International Ltd Improvements in or relating to defrosting of heat exchangers
EP0372595A1 (fr) * 1988-11-09 1990-06-13 Contronics Holland B.V. Installation commandant le dégivrage d'un dispositif frigorifique

Also Published As

Publication number Publication date
EP0052323A3 (fr) 1982-09-22
DE3043459A1 (de) 1982-07-08

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Inventor name: BOECKMANN, GERD

Inventor name: JOEST, ULRICH