EP2283287A1 - Procede de commande de degivrage d'un refrigerateur et refrigerateur utilisant ce procede - Google Patents

Procede de commande de degivrage d'un refrigerateur et refrigerateur utilisant ce procede

Info

Publication number
EP2283287A1
EP2283287A1 EP09738015A EP09738015A EP2283287A1 EP 2283287 A1 EP2283287 A1 EP 2283287A1 EP 09738015 A EP09738015 A EP 09738015A EP 09738015 A EP09738015 A EP 09738015A EP 2283287 A1 EP2283287 A1 EP 2283287A1
Authority
EP
European Patent Office
Prior art keywords
evaporator
evaporator fan
compressor
fan
defrosting
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Withdrawn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
EP09738015A
Other languages
German (de)
English (en)
Inventor
Xiaotian Zhou
Qiwu Zhu
Junhong Feng
Weizhong Zhu
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete 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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2283287A1 publication Critical patent/EP2283287A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F25D21/006—Defroster control with electronic control circuits
    • 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
    • F25B2600/11—Fan speed control
    • F25B2600/112—Fan speed control of evaporator fans
    • 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
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/062—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators
    • 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
    • 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

Definitions

  • This invention relates to a home electric appliance and its control method, and more particularly to a defrost control method of a household electric refrigerator and to refrigerators using this method.
  • the cooling control of the refrigerator also includes a refrigeration cycle for the storage room cooling and a defrost cycle for defrosting the evaporator.
  • US Pat. No. 6,694,755 B2 discloses a defrost method for household electric refrigerators.
  • defrost cycle defrosting of the evaporator is performed by starting the heater for a preset time. After the heater is turned off, before starting the compressor to perform the normal refrigeration cycle, the refrigeration system is stopped for a preset time so that the defrost water melted on the evaporator can be completely drained from the evaporator and discharged. This preset period of time is referred to as "drip time".
  • the evaporator fan is usually mounted in proximity to the evaporator. Due to the high humidity in the environment of the evaporator is usually formed during the defrosting of the evaporator on the fan blades of the evaporator fan and on the inner Surface of the evaporator chamber near the fan blades by condensing a thin layer of water pearls. After stopping the heating operation of the heater, regardless of whether there is a "drip time" or the compressor is started immediately to perform the cooling cycle, a rapid drop in the temperature of the evaporator chamber is caused.
  • the object of this invention is to provide a method of defrosting a refrigerator that can ensure the normal start of the refrigeration cycle after the defrost cycle and refrigerators using this method.
  • a refrigerator of an embodiment according to the invention comprises a cabinet body with storage space, a cooling and defrosting system and a control device for controlling this cooling and defrosting system.
  • This cooling and defrosting system includes the elements compressor, evaporator, evaporator fan and heater.
  • the control device comprises an evaporator sensor for checking the evaporator temperature and a storage space sensor for checking the temperature of the storage space. After completing a defrost cycle, before starting the evaporator fan to perform the cooling operation, the controller first intermittently starts the evaporator fan temporarily for a preset time.
  • a further improvement of this invention is that the length of the preset time for the intermittent short-term operation is 5 seconds to 30 seconds.
  • a further improvement of this invention is that the described evaporator is the evaporator of the freezer compartment, that the described evaporator fan is the evaporator fan of the freezer compartment and that the conditions described for carrying out the cooling operation by starting the evaporator fan are as follows:
  • the evaporator temperature determined by the evaporator sensor is lower than the storage space temperature determined by the storage space sensor.
  • the described evaporator fan is arranged horizontally on the described evaporator.
  • a defrost control method which corresponds to a refrigerator according to an embodiment of the invention, comprises the steps of: a) stopping the compressor operation, starting the defrosting process; b) starting the heating and maintaining the start state for a preset time; c) switching off the heating; d) start the compressor; e) after the start of the compressor, before starting the evaporator fan to perform the cooling operation, the evaporator fan is intermittently briefly intermittently put into operation at least once.
  • a further improvement of this invention is that the described start of the defrosting process comprises the substeps of: a) stopping the compressor operation; b) starting the evaporator fan and maintaining operation for a preset time; c) stopping the operation of the evaporator fan and maintaining the stop condition for a preset time; d) Start the heating.
  • a further improvement of this invention is that the described step of starting the compressor comprises the following substeps: a) turning off the heater; b) let the cooling system stop for a preset time; c) after the preset stop time has elapsed, start the compressor.
  • a further improvement of this invention is that the step described, in which the evaporator fan is intermittently briefly put into operation at least once, comprises the following sub-steps: a) after starting the compressor, the evaporator fan maintains standstill for a pre-set time; b) start the evaporator fan and short-term operation for a preset time; c) stopping the evaporator fan and maintaining the stop state for a preset time; d) Assessment of whether a repeated short-term start of the evaporator fan is required.
  • the benefit of this invention is that after the defrost cycle and prior to the start of the compressor and evaporator fan to perform the normal refrigeration cycle, the evaporator fan is previously briefly actuated once or several times to eject the water beads on the fan blades and thereby subsequently Cooling cycle to prevent frosting on the fan blades.
  • Figure 1 shows a schematic representation of the cooling and defrosting system of a
  • FIG. 2 shows a schematic diagram for the control of the cooling and defrost system of this
  • a refrigerator according to the invention comprises a cabinet body 1 with storage space 2, a cooling and defrosting system and a control device for controlling this cooling and defrosting system.
  • this cooling and defrosting system comprises the elements compressor 3, evaporator 4, evaporator fan 5 and heater (not shown), and the control device comprises an evaporator sensor for checking the evaporator temperature and a storage space sensor (not shown) for checking the temperature of the storage room.
  • the target temperature is usually minus 18 0 C.
  • the evaporator 4 is the evaporator of the freezer compartment, which is mounted between the rear wall 10 of the cabinet body 1 and the evaporator cover 6.
  • the room in which the evaporator is housed may be called an evaporator chamber.
  • the evaporator fan 5 is the evaporator of the freezer room, which is disposed adjacent to the evaporator of the freezer room.
  • the fan blades of the evaporator fan are arranged horizontally, and also the distance between the rear wall 10 of the cabinet body 1 and the evaporator cover 6 is very small.
  • the heater may be ordinary electric heating wire connected and secured together near the fins of the evaporator and the refrigerant tubes.
  • the storage room sensor is a temperature sensor for checking the temperature of the freezer compartment, which is mounted on the inner wall of the freezer compartment.
  • the evaporator sensor is a temperature sensor for checking the temperature of the evaporator mounted on the evaporator. The temperature determined by these two temperature sensors goes as feedback to the circuit board of the control device and is processed there.
  • the control device sends according to the result of processing corresponding control signals to the elements compressor 3, evaporator 4, evaporator fan
  • the control process of the cooling and defrosting system of this invention includes the refrigeration cycle 30 and the defrost cycle 31.
  • the refrigeration cycle 30 includes a plurality of continuously repeating refrigeration processes t ⁇ , t1 ... tn.
  • Example Cooling Process t1 In the previous cooling process t ⁇ , when the temperature of the freezing room reaches the stop temperature of the compressor, the compressor and the evaporator fan stop operating, then the temperature of the freezing room continuously increases and the rise reaches the point of the target temperature, the compressor is turned on. At the same time, the evaporator fan is set in motion, and the cooling process t1 starts.
  • the control system continuously judges whether the system already meets the requirements for starting the defrost cycle 31, based on the preset conditions.
  • the preset conditions for the start of the defrost cycle 31 include the length of time of the previous defrost cycle, the length of the operating time of the refrigeration cycle 30, the length of the compressor on-time, the number of door openings, etc.
  • the defrosting process t comprises the five phase-like time periods ⁇ t0, ⁇ t1, ⁇ t2, ⁇ t3 and ⁇ t4, which will be described below.
  • ⁇ tO is a preset period of time.
  • the compressor is in the stopped state
  • the evaporator fan is in the stopped state
  • the heater is in the off state.
  • the goal of the establishment of the time interval ⁇ tO is to give sufficient time for the liquid refrigerant of the evaporator to return to the accumulator.
  • the second period is the section ⁇ t1.
  • ⁇ t1 is a preset period of time.
  • ⁇ t1 the compressor is in the stopped state, the evaporator fan is in the operating state, the heater is in the off state.
  • the purpose of the device of the period ⁇ t1 is to absorb the air flow in the high relative temperature freezer compartment into the evaporator chamber and to flow past the surface of the evaporator so that the temperature of the evaporator can increase to a certain extent in advance.
  • the third period is the section ⁇ t2.
  • ⁇ t2 is a preset time period. In ⁇ t2 the compressor is in the stopped state, the evaporator fan is in the stopped state, the heater is in the off state.
  • the fourth time period is the section ⁇ t3.
  • ⁇ t3 the compressor is in the stopped state, the evaporator fan is in the stopped state, the heater is in the continuously switched-on state.
  • the aim of the establishment of the period .DELTA.t3 is to make heating of the evaporator by use of the heater, to let the temperature of the evaporator rise rapidly and thereby to achieve an effective and rapid defrosting.
  • ⁇ t3 is a pre-set period whose duration is influenced by two factors: 1. Evaporator set defrost temperature: When the evaporator temperature detected by the evaporator sensor has risen to the set defrost temperature value, the heater is turned off. 2.
  • the fourth period is the section ⁇ t4. In ⁇ t4 the compressor is in the stopped state, the evaporator fan is in the stopped state, the heater is in the switched-off state. The goal of the establishment of the period ⁇ t4 is to allow the melt water on the evaporator to drain completely from the evaporator.
  • the compressor is started and turned on.
  • the evaporator temperature then begins to drop.
  • the evaporator fan at this time by no means also take immediately in succession the normal cooling operation. Otherwise, the air flow would be taken in the evaporator chamber with a higher temperature than the freezer compartment temperature in the freezer compartment.
  • the temperature of the evaporator chamber also drops continuously because the evaporator temperature continuously drops, causing the water beads on the evaporator fan blades as well as the inner surface of the evaporator chamber in the vicinity of the fan blades to increase rapidly Frost condense and thereby block the space for the rotation of the fan blades between the fan blades of the evaporator fan and the inner surface of the evaporator chamber, whereby a normal start of the evaporator fan is subsequently made impossible. Therefore, in this invention, moreover, the period ⁇ t5 has been established.
  • the starting point of the period ⁇ t5 is the end point of the period ⁇ t4.
  • the end point of ⁇ t5 is the node T of the set temperature up to which the evaporator temperature falls. At this node T, the evaporator temperature may be equal to or lower than the temperature of the freezer compartment.
  • the total length of the time interval ⁇ t5 can be between 5 seconds and 30 seconds.
  • the evaporator fan is set intermittently briefly at least once in operation. The goal is to spin off the water pearls on the fan blades to prevent frosting on the fan blades in the subsequent cooling cycle.
  • Each short-term operation generally includes the following steps: a) after the start of the compressor, the evaporator fan is kept idle for a preset time; b) start the evaporator fan and short-term operation for a preset time; c) stop the evaporator fan and hold the stop state for a preset time; d) Assessment of whether a repeated short-term start of the evaporator fan is required.
  • the reference conditions for the number of short-term operation include the volume of the freezing space, the temperature at the start of the evaporator fan for performing the cooling operation, the size of the dimensions of the blades of the evaporator fan, etc.
  • this embodiment is applied to a freezer evaporator
  • the defrost method of this invention can be applied to the evaporator of a cold storage room and the evaporator fan of the cold storage room, in particular a cold storage room, which has a change temperature zone and the temperature between plus degrees and Minus degrees can be switched.

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)

Abstract

L'invention concerne un procédé de commande de dégivrage d'un réfrigérateur, et un réfrigérateur utilisant ce procédé. Le réfrigérateur selon l'invention comprend un corps de réfrigérateur (1) présentant un compartiment de stockage (2), un système de réfrigération et de dégivrage, et un dispositif de commande destiné à commander ledit système de réfrigération et de dégivrage. Le système de réfrigération et de dégivrage comprend les éléments suivants: un compresseur (3), un évaporateur (4), un ventilateur d'évaporateur (5) et un dispositif de chauffage. Le dispositif de commande comprend un capteur d'évaporateur pour vérifier la température de l'évaporateur et un capteur de compartiment de stockage pour vérifier la température du compartiment de stockage. Une fois un cycle de dégivrage terminé, le dispositif de commande met d'abord brièvement en marche le ventilateur d'évaporateur (5) par intermittence, pendant une période préréglée, avant de mettre en marche ledit ventilateur d'évaporateur en mode réfrigération.
EP09738015A 2008-04-29 2009-04-17 Procede de commande de degivrage d'un refrigerateur et refrigerateur utilisant ce procede Withdrawn EP2283287A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200810025191.1A CN101571339B (zh) 2008-04-29 2008-04-29 冰箱除霜控制方法及应用该方法的冰箱
PCT/EP2009/054612 WO2009132971A1 (fr) 2008-04-29 2009-04-17 Procédé de commande de dégivrage d'un réfrigérateur et réfrigérateur utilisant ce procédé

Publications (1)

Publication Number Publication Date
EP2283287A1 true EP2283287A1 (fr) 2011-02-16

Family

ID=41026403

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09738015A Withdrawn EP2283287A1 (fr) 2008-04-29 2009-04-17 Procede de commande de degivrage d'un refrigerateur et refrigerateur utilisant ce procede

Country Status (4)

Country Link
US (1) US8511102B2 (fr)
EP (1) EP2283287A1 (fr)
CN (1) CN101571339B (fr)
WO (1) WO2009132971A1 (fr)

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CN101571339B (zh) 2012-08-29

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