CN107192206A - A kind of defrosting method of refrigerator - Google Patents
A kind of defrosting method of refrigerator Download PDFInfo
- Publication number
- CN107192206A CN107192206A CN201710516068.9A CN201710516068A CN107192206A CN 107192206 A CN107192206 A CN 107192206A CN 201710516068 A CN201710516068 A CN 201710516068A CN 107192206 A CN107192206 A CN 107192206A
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- China
- Prior art keywords
- evaporator
- pressure
- defrost
- pressure difference
- difference detection
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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
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
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- 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
-
- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
-
- 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
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
-
- 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
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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)
- Defrosting Systems (AREA)
Abstract
The invention provides a kind of defrosting method of refrigerator.Defrosting method includes：Judge whether the evaporator needs defrost；When the evaporator needs defrost, all heater strips are opened, so that each heater strip heating carries out defrost；Detect defrost temperature；And the pressure differential between multiple different heights of the evaporator is detected using multiple pressure difference detection devices, obtain multiple first pressure differences；The partly or entirely heater strip is closed according to the defrost temperature and/or each first pressure difference.The defrosting method can suitably reduce the thermal discharge of heater strip at diverse location so that the evaporator of refrigerator can defrost on demand, can both reduce power consumption, reduce defrost duration, fresh-keeping effect can also be strengthened.
Description
Technical field
The present invention relates to refrigerating storing field, more particularly to a kind of defrosting method of refrigerator.
Background technology
Refrigerator is to maintain a kind of refrigeration plant of constant low temperature, is also that one kind makes food or other articles keep constant low temperature
The product for civilian use of cold conditions.Air-cooled technology is by built-in hiding cooler (such as the evaporator of coolant circulating system) to flowing through it
Air freezed, force circulating cold air to flow by fan, so that cold air is uniformly distributed in refrigerator each compartment, realize
Refrigeration.When air passes through evaporator surface in refrigerator, the moisture in air can condense in evaporator surface, due to evaporator temperature
Spend low, frost layer is formed after a period of time, causes evaporator heat transfer efficiency to decrease up to evaporator and is completely plugged and fails, drop
Low refrigerator operational efficiency, it is necessary to carry out defrost after operation a period of time.
Existing defrost is generally provided with electric heater in base of evaporator, when evaporator surface frost layer reaches certain thickness,
Refrigerator stops refrigeration, and heater is started working, heating and melting frost layer.During defrost is carried out to evaporator, the bottom of evaporator
Portion is first heated, therefore the frost of base of evaporator is first begin to melt, and the frost in the middle part of finisher and top is just gradually melted,
Therefore time for being heated of the heated device of base of evaporator is long, be very easy to cause the working of plastics of base of evaporator by
There is the phenomenon of aged deterioration in heated time length.Frost on evaporator is in the process gradually melted as water from the bottom to top
In to absorb substantial amounts of heat, and the thawing time is more very long, there is serious heat waste phenomenon.
The content of the invention
Inventor thinks that the mode of present refrigerator inside defrost is essentially all to carry out defrost based on experience value, but refrigerator
According to the change of normal service condition and environment, internal frosting velocity is different, and, because for evaporator in itself
Relation of wind direction etc., evaporator diverse location frosting velocity is also different, is carried out in base of evaporator provided with electric heater
Frost on defrost, evaporator will absorb substantial amounts of heat during gradually thawing from the bottom to top is water, and when melting
Between it is more very long, there is serious heat waste phenomenon.
Therefore, the present invention is intended to provide a kind of defrosting method for refrigerator, can make evaporator defrost on demand, on demand defrost
Not only include carrying out defrost according to the frosting position of evaporator, in addition to apply the heat being adapted according to frost layer amount at each position
Amount, it is extremely important to change the frost of evaporator diverse location on demand, so can both reduce power consumption, reduces defrost duration, also may be used
To strengthen fresh-keeping effect.
Specifically, the invention provides a kind of defrosting method of refrigerator, wherein refrigerator include evaporator, multiple heater strips and
Multiple pressure difference detection devices；Each heater strip is horizontally extending, and multiple heater strips are along between the short transverse of evaporator
Every setting；Each heater strip is configured to directly or indirectly heating evaporation device；Each pressure difference detection device is configured to detection and steamed
Send out device two different heights between pressure differential, and multiple pressure difference detection devices be configured to detect evaporator it is multiple not
With the pressure differential between height；And defrosting method includes：
Judge whether evaporator needs defrost；
When evaporator needs defrost, whole heater strips are opened, so that each heater strip heating carries out defrost；
Detect defrost temperature；And utilize the pressure between multiple different heights of multiple pressure difference detection devices detection evaporator
Power is poor, obtains multiple first pressure differences；
Part or all of heater strip is closed according to defrost temperature and/or each first pressure difference.
Alternatively, multiple different heights that multiple pressure difference detection devices detect evaporator are determined with according to defrost temperature
Between pressure differential opportunity.
Alternatively, closing part or all of heater strip according to defrost temperature and/or each first pressure difference includes：
Whole heater strips are closed when defrost temperature reaches the first preset temperature value.
Alternatively, each pressure difference detection device is configured to cooperatively work with least one heater strip；And defrost side
Method also includes：
Obtain the initial value of the pressure differential between multiple different heights of evaporator；
Closing part or all of heater strip according to defrost temperature and/or each first pressure difference includes：
When each first pressure difference is less than or equal to its corresponding initial value, the first pressure is closed and obtained poor
At least one heater strip that the pressure difference detection device of value cooperatively works.
Alternatively, evaporator is detected using multiple pressure difference detection devices when defrost temperature reaches the second preset temperature value
Multiple different heights between pressure differential；Second preset temperature value is less than the first preset temperature value.
Alternatively, evaporator is detected using multiple pressure difference detection devices when defrost temperature reaches three preset temperature values
Multiple different heights between pressure differential；3rd preset temperature value is less than the first preset temperature value, and the 3rd preset temperature value is big
In the second preset temperature value；Or,
After defrost temperature reaches the second preset temperature value, when defrost temperature often improves preset temperature difference, using many
Pressure differential between multiple different heights of individual pressure difference detection device detection evaporator.
Alternatively, each pressure difference detection device detect evaporator two different heights between pressure differential when,
The blower fan of refrigerator is set to be operated under the first predeterminated voltage, each pressure difference detection device exports multiple in the first preset time
One detected value, the first pressure difference corresponding with the pressure difference detection device is the maximum of pressure difference detection device output
First detected value.
Alternatively, obtaining the initial value of the pressure differential between multiple different heights of evaporator includes：
Refrigerator is when opening, and refrigerator first runs well preset duration, after the blower fan of refrigerator is transported under the second predeterminated voltage
Turn, each pressure difference detection device exports multiple second detected values in the second preset time；
The average value of multiple second detected values of each pressure difference detection device output is calculated, and is filled with the pressure difference detection
Put the average value for multiple second detected values that corresponding initial value exports for the pressure difference detection device.
Alternatively, judge whether evaporator needs defrost to include：
After the acquisition of each initial value or after completion defrost every time in the 3rd preset time, blower fan normal work；And
After each initial value is obtained or in three preset time after completing defrost every time, blower fan is set to be operated under the 3rd predeterminated voltage,
Each pressure difference detection device exports multiple 3rd detected values in the 4th preset time, and exports the pressure difference detection device
The 3rd maximum detected value be second pressure difference, to obtain multiple second pressure differences；
If one or more second pressure differences are more than or equal to respective threshold value, evaporator needs is judged
Frost；Otherwise the preset time of blower fan normal work the 5th is made, Posterior circle, which enters, makes blower fan be operated under the 3rd predeterminated voltage, each pressure
Power device for detecting difference exports multiple 3rd detected values, and the maximum for exporting the pressure difference detection device in the 4th preset time
The 3rd detected value be second pressure difference, to obtain multiple second pressure differences；
5th preset time is less than the 3rd preset time；
Each threshold value is more than or equal to the initial value corresponding with the threshold value.
Alternatively, when evaporator needs defrost, also close at least the inlet air door of the storing compartment of refrigerator；
Refrigerator also includes temperature sensor, and temperature sensor is arranged at the top of evaporator, is configured to detect defrost temperature；
Pressure difference detection device is two, including first pressure device for detecting difference and second pressure device for detecting difference；
First pressure device for detecting difference be configured to detect evaporator bottom end and upper end between pressure differential, and with most
One group of heater strip of lower section is configured to cooperatively work, and one group of heater strip of bottom includes at least one heater strip；
Second pressure device for detecting difference be configured to detect evaporator center and upper end between pressure differential, and with most
All heater strips are configured to cooperatively work above one group of heater strip of lower section；
Each pressure difference detection device is differential pressure pick-up.
The defrosting method of the refrigerator of the present invention can be according to the frosting degree of diverse location, defrost temperature, evaporator on evaporator
Multiple different heights between pressure differential, the appropriate thermal discharge for reducing heater strip at diverse location, so that the evaporator of refrigerator can
Defrost on demand, it is extremely important to change the frost of evaporator diverse location on demand, power consumption so can be both reduced, during reduction defrost
It is long, fresh-keeping effect can also be strengthened.
Further, refrigerator of the invention can judge evaporator according to the pressure differential between multiple different heights of evaporator
Frosting degree and then judge whether evaporator needs defrost, quick and precisely, accurately and effectively to enter defrosting operation, so as to will
The frost adhered on evaporator is melted in time, it is to avoid defrosting operation need not be being carried out during defrost, so as to save electric energy.
According to the accompanying drawings to the detailed description of the specific embodiment of the invention, those skilled in the art will be brighter
Above-mentioned and other purposes, the advantages and features of the present invention.
Brief description of the drawings
Some specific embodiments of the present invention are described in detail by way of example, and not by way of limitation with reference to the accompanying drawings hereinafter.
Identical reference denotes same or similar part or part in accompanying drawing.It should be appreciated by those skilled in the art that these
What accompanying drawing was not necessarily drawn to scale.In accompanying drawing：
Fig. 1 is the schematic diagram of refrigerator according to an embodiment of the invention；
Fig. 2 is the schematic local structural graph of refrigerator according to an embodiment of the invention；
Fig. 3 is the schematic side elevation of structure shown in Fig. 2；
Fig. 4 is the indicative flowchart of the defrosting method of refrigerator according to an embodiment of the invention.
Embodiment
Fig. 1 is the schematic diagram of refrigerator according to an embodiment of the invention；Fig. 2 is according to one implementation of the present invention
The schematic local structural graph of the refrigerator of example；Fig. 3 is the schematic side elevation of structure shown in Fig. 2.As shown in Figure 1, Figure 2 and Figure 3,
The embodiments of the invention provide a kind of refrigerator.The refrigerator may include casing 10, door body, refrigeration system, blower fan, the detection of frosting situation
Device, defrosting heater and temperature sensor.
There are multiple storing compartments in casing 10.Storing compartment is used to store food.Multiple storages in the embodiment of the present invention
Thing compartment may include the refrigerating chamber 11 of often storage vegetables, and its temperature-control range is general at -5 DEG C to 7 DEG C.Multiple storing compartments may be used also
Including refrigerating chamber 12, temperature-changing chamber etc..Door body can be to be multiple, and each door body is configured to controllably to open or close between a storing
Room.Further, casing 10 also has compressor bin, cooling chamber, and connects the ducting system of storing compartment and cooling chamber.It is cold
But room can be at the rear side of refrigerating chamber 12.In Fig. 1, the air duct cover board between cooling chamber and refrigerating chamber 12 is not shown.
Refrigerant system configuration is into cold is provided to reduce indoor temperature between storing.Specifically, refrigeration system can be compression
Formula refrigeration system, it includes compressor, condenser, throttling arrangement and evaporator 20 etc..Compressor may be disposed in compressor bin.
Evaporator 20 may be disposed in cooling chamber, be configured with entering the gas temperature in the refrigerant reduction cooling chamber in it, to pass through
By ducting system make storing between indoor temperature be maintained in preset temperature or preset temperature range.Blower fan, which can be configured to, to be promoted
Air-flow flows to storing compartment from cooling chamber, and flows back to cooling chamber from storing compartment, and makes air-flow from evaporator 20 in cooling chamber
Lower end flowed to upper end.
Frosting situation detection means may be disposed in cooling chamber, for making refrigerator according to the detection of frosting situation detection means
As a result judge whether refrigerator needs defrost.Frosting situation detection means may include multiple pressure difference detection devices 60.Each pressure
Device for detecting difference 60 is configured to detect the pressure differential between two different heights of evaporator 20, and multiple pressure difference detections are filled
Put 60 pressure differentials being configured between multiple different heights of detection evaporator.Each pressure difference detection device 60 is preferably that differential pressure is passed
Sensor.Multiple pressure difference detection devices 60 can be arranged at intervals along the length direction of evaporator 20.In refrigerator, air-flow is typically from evaporation
Flowed to upper end the lower end of device.Windage feelings on the size reactive evaporation device of pressure differential between multiple different heights of evaporator
Condition, pressure differential is more big, shows that the windage of evaporator is bigger, then frost layer that can be on baudelot evaporator 20 is thicker, and the resistance of wind is got over
Greatly.The frosting situation detection means is particularly suitable for use in the refrigerator with longer and/or higher evaporator 20, can make detection structure
It is more accurate, accurately and effectively to enter defrosting operation, so as to which the frost adhered on evaporator is melted in time, it is to avoid
Defrosting operation need not be being carried out during defrost, so as to save electric energy.
Defrosting heater can have multiple heater strips 40.Each heater strip 40 can be horizontally extending, and it is multiple plus
Short transverse of the heated filament 40 along evaporator 20 is arranged at intervals, and each heater strip 40 is configured to directly or indirectly heating evaporation device
20, so that multiple heater strips 40 can be heated at multiple different height positions to evaporator 20.Further, defrosting is heated
Device may also include heat-conducting plate 30.Heat-conducting plate 30 is arranged at the side of evaporator 20, and thermally contacts and (connect with evaporator 20
Touch is thermally coupled).Each heater strip 40 is thermally contacted with heat-conducting plate 30.Heat-conducting plate 30 can be used for making heat spread at heater strip 40
Onto evaporator 20, defrosting efficiency is improved.In some preferred embodiments of the present invention, heat-conducting plate 30 is arranged at multiple heating
Between silk 40 and evaporator 20, the heat transfer that each heater strip 40 is produced to evaporator 20.It is preferable to carry out at other
In example, multiple heater strips 40 are arranged in heat-conducting plate 30.
Temperature sensor is preferably provided at the top of evaporator 20, is configured to detect the defrost temperature of evaporator 20.
In some alternate embodiments, temperature sensor may be disposed on evaporator.
Especially, each pressure difference detection device 60 can be configured to cooperatively work with least one heater strip 40.Example
Such as, pressure difference detection device 60 is two, including first pressure device for detecting difference and second pressure device for detecting difference.First pressure
Device for detecting difference be configured to detect evaporator bottom end and upper end between pressure differential, and with one group of heater strip of bottom
40 are configured to cooperatively work, and one group of heater strip 40 of bottom includes at least one heater strip 40.Second pressure difference detection
Device is configured to detect the pressure differential between the center of evaporator and upper end, and with institute above one group of heater strip of bottom
Some heater strips 40 are configured to cooperatively work.For another example the height of the evaporator of each detection of pressure difference detection device 60
When scope will not be overlapping or somewhat overlapping with the altitude range that other pressure difference detection devices are detected, each pressure difference detection dress
At least one heater strip 40 can be set in the altitude range for the evaporator for putting 60 detections.For another example pressure difference detection device is with adding
The cooperation of heated filament 40 can artificially be arranged to other forms, so that defrost demand on demand is better achieved.
Fig. 4 is the indicative flowchart of the defrosting method of refrigerator according to an embodiment of the invention.As shown in figure 4, special
Not, the embodiment of the present invention additionally provides a kind of defrosting method of refrigerator.The highest heating power of every heater strip 40 is preferable
To be the same, i.e., using the multiple heater strips 40 of identical.Certainly the heater strip 40 of different heat power can also be used.Defrosting method can
Including：
Judge whether evaporator 20 needs defrost.
When evaporator 20 needs defrost, whole heater strips 40 are opened, so that each heating of heater strip 40 carries out defrost.Enter
One step, when evaporator 20 needs defrost close also at least the inlet air door of the storing compartment of refrigerator.
Detect between defrost temperature, and multiple different heights of utilization multiple pressure difference detection devices 60 detection evaporator 20
Pressure differential, obtains multiple first pressure differences.
Part or all of heater strip 40 is closed according to defrost temperature and/or each first pressure difference.
Specifically for example, in some embodiments of the invention, when defrost temperature reaches the first preset temperature value, closing
Whole heater strips 40, with and complete defrost.Temperature sensor is preferably provided at the top of evaporator 20；First preset temperature value
Preferably 6.6 DEG C to 7.4 DEG C, such as 6.9 DEG C, 7 DEG C.In some embodiments of the invention, defrosting method also includes：Obtain
The initial value of pressure differential between multiple different heights of evaporator 20.Closed according to defrost temperature and/or each first pressure difference
Closing part or all of heater strip 40 includes：When each first pressure difference is less than or equal to its corresponding initial value, close
With obtaining at least one heater strip 40 that the pressure difference detection device 60 of the first pressure difference cooperatively works.
In this embodiment, frosting velocity is very fast at the portion of evaporator 20, and frosting velocity is slower at portion,
In defrost, some heater strips 40 suitably can be first closed, so that defrost on demand can be realized, so that the relatively thin local frost layer of evaporator
Appropriate heat is obtained, electric energy is saved.That is this heating defrost mode can effectively reduce the defrost time, and change
During frost, power consumption needed for whole defrost is reduced, and can effectively reduce internal temperature of refrigerator fluctuation.
In some preferred embodiments of the present invention, multiple pressure difference detection devices can be determined with according to defrost temperature
On the opportunity of pressure differential between multiple different heights of 60 detection evaporators 20, preferably to determine the opportunity for terminating defrost, shorten
Defrost duration, so as to improve refrigerator efficiency, saves the energy.
Specifically, the present invention some specific embodiments in, can when defrost temperature reaches the second preset temperature value,
The pressure differential between multiple different heights of evaporator 20 is detected using multiple pressure difference detection devices 60.Second preset temperature value is small
In the first preset temperature value.Second preset temperature value can be 3.6 DEG C to 4.4 DEG C, such as 3.9 DEG C, 4 DEG C.Further, may be used also
Multiple differences of evaporator 20 are detected using multiple pressure difference detection devices 60 when defrost temperature reaches three preset temperature values
Pressure differential between height.3rd preset temperature value is less than the first preset temperature value, and the 3rd preset temperature value is more than second and preset
Temperature value.3rd preset temperature value can be 5 DEG C to 6 DEG C, such as 5 DEG C, 5.2 DEG C, 5.5 DEG C, 5.6 DEG C, 6 DEG C.
In other further embodiments of the present invention, after defrost temperature reaches the second preset temperature value,
When defrost temperature often improves preset temperature difference, the multiple different high of evaporator 20 is detected using multiple pressure difference detection devices 60
Pressure differential between degree.Preset temperature difference can be 0.3 to 0.8 DEG C.For example, the second preset temperature value can be 4 DEG C, preset temperature is poor
It is worth for 0.5 DEG C, then can detects many of evaporators 20 in 4.5 DEG C, 5 DEG C, the multiple pressure difference detection devices 60 of the time utilizations such as 5.5 DEG C
Pressure differential between individual different height.
Preferably, the pressure between two different heights of each pressure difference detection device 60 in detection evaporator 20
When poor, blower fan is set to be operated under the first predeterminated voltage, each pressure difference detection device 60 exports multiple in the first preset time
First detected value, what the first pressure difference corresponding with the pressure difference detection device 60 exported for the pressure difference detection device 60
The first maximum detected value.First predeterminated voltage can be 11V to 13V, such as 11V, 12V, 13V.First preset time can be
1.5s to 4s, such as 1.5s, 1.8s, 2s, 2.2s, 3s, 3.5s.
In some embodiments of the invention, the initial value for obtaining the pressure differential between multiple different heights of evaporator 20 can
Including：Refrigerator open when, make refrigerator normal operation preset duration, after blower fan operate under the second predeterminated voltage, each press
Power device for detecting difference 60 exports multiple second detected values in the second preset time.Each pressure difference detection device 60 is calculated to export
Multiple second detected values average value, and the initial value corresponding with the pressure difference detection device is the pressure difference detection device
The average value of multiple second detected values of output.Preset duration can be 2min to 6min, such as 3min, 4min, 5min.Second
Predeterminated voltage can be 11V to 13V, such as 11V, 12V, 13V.Second preset time can be 50s to 80s, preferably 60s, 70s
Deng.Further, close can also at least in detection the inlet air door of the storing compartment of refrigerator.In some alternate embodiments
In, it when refrigerator is opened, blower fan is operated under the second predeterminated voltage, refrigerator is first run well preset duration.
In other alternate embodiments, each initial value can be preset value, and refrigerator is directly set when developing.
In some embodiments of the invention, it is preferred to use the testing result of pressure difference detection device 60 judges evaporator
Whether 20 need defrost.Specifically, judge whether evaporator 20 needs defrost to include：
After initial value acquisition or after completion defrost every time in the 3rd preset time, blower fan normal work (is also just meaned
Refrigerator normal work).3rd preset time can be 3H to 5H, such as can be 3.8H, 4H, 4.5H.Moreover, being obtained in initial value
After taking or in three preset time after completing defrost every time, blower fan is set to be operated under the 3rd predeterminated voltage, each pressure differential inspection
Multiple 3rd detected values, and the maximum for exporting the pressure difference detection device 60 can be exported in the 4th preset time by surveying device 60
The 3rd detected value be second pressure difference, to obtain multiple second pressure differences.3rd predeterminated voltage can be for 11V extremely
13V, such as 11V, 12V, 13V.4th preset time can be 8s to 12s, preferably 9s, 10s etc..
If one or more second pressure differences are more than or equal to respective threshold value, the needs of evaporator 20 is judged
Frost；Otherwise the preset time of blower fan normal work the 5th is made, Posterior circle, which enters, makes blower fan be operated under the 3rd predeterminated voltage, each pressure
Power device for detecting difference 60 can export multiple 3rd detected values in the 4th preset time, and export the pressure difference detection device 60
The 3rd maximum detected value be second pressure difference, to obtain multiple second pressure differences.5th preset time can be
0.6H to 1.5H, such as can be 0.8H, 1H, 1.25H.Threshold value can be pre-set, and each threshold value is more than or equal to and the threshold value
Corresponding initial value.In some alternate embodiments, it can determine whether whether each second pressure difference is more than or equal to obtaining
To the corresponding initial value of the pressure difference detection device 60 of the second pressure difference, with directly according to the comparative result with initial value
Judge whether evaporator 20 needs defrost.
In some alternate embodiments of the present invention, also can according to the continuous operating time of the compressor of refrigerator and/or
The total run time of compressor judges whether evaporator 20 needs defrost.Also the temperature that can be detected according to temperature sensor judges
Whether evaporator 20 needs defrost.
So far, although those skilled in the art will appreciate that detailed herein have shown and described multiple showing for the present invention
Example property embodiment, still, still can be direct according to present disclosure without departing from the spirit and scope of the present invention
It is determined that or deriving many other variations or modifications for meeting the principle of the invention.Therefore, the scope of the present invention is understood that and recognized
It is set to and covers other all these variations or modifications.
Claims (10)
1. a kind of defrosting method of refrigerator, wherein the refrigerator includes evaporator, multiple heater strips and multiple pressure difference detections dress
Put；Each heater strip is horizontally extending, and short transverse interval of multiple heater strips along the evaporator is set
Put；Each heater strip is configured to directly or indirectly heat the evaporator；Each pressure difference detection device configuration
Pressure differential between into two different heights for detecting the evaporator, and multiple pressure difference detection devices are configured to inspection
The pressure differential surveyed between multiple different heights of the evaporator；And the defrosting method includes：
Judge whether the evaporator needs defrost；
When the evaporator needs defrost, all heater strips are opened, so that each heater strip heating carries out defrost；
Detect defrost temperature；And between multiple different heights using multiple pressure difference detection devices detections evaporator
Pressure differential, obtain multiple first pressure differences；
The partly or entirely heater strip is closed according to the defrost temperature and/or each first pressure difference.
2. defrosting method according to claim 1, wherein
Multiple pressure difference detection devices are determined with according to the defrost temperature and detect the multiple different high of the evaporator
The opportunity of pressure differential between degree.
3. defrosting method according to claim 2, wherein
Closing the partly or entirely heater strip according to the defrost temperature and/or each first pressure difference includes：
All heater strips are closed when the defrost temperature reaches the first preset temperature value.
4. defrosting method according to claim 1, wherein
Each pressure difference detection device is configured to cooperatively work with heater strip at least one described；And
The defrosting method also includes：
Obtain the initial value of the pressure differential between multiple different heights of the evaporator；
Closing the partly or entirely heater strip according to the defrost temperature and/or each first pressure difference includes：
When each first pressure difference is less than or equal to its corresponding initial value, first pressure is closed and obtained
At least one described heater strip that the pressure difference detection device of power difference cooperatively works.
5. defrosting method according to claim 3, wherein
When the defrost temperature reaches the second preset temperature value the evaporation is detected using multiple pressure difference detection devices
Pressure differential between multiple different heights of device；Second preset temperature value is less than first preset temperature value.
6. defrosting method according to claim 5, wherein
When the defrost temperature reaches three preset temperature values the evaporation is detected using multiple pressure difference detection devices
Pressure differential between multiple different heights of device；3rd preset temperature value is less than first preset temperature value, and described the
Three preset temperature values are more than second preset temperature value；Or,
After the defrost temperature reaches second preset temperature value, preset temperature difference is often improved in the defrost temperature
When, the pressure differential between multiple different heights of the evaporator is detected using multiple pressure difference detection devices.
7. defrosting method according to claim 1, wherein
Each pressure difference detection device makes institute in the pressure differential between detecting two different heights of the evaporator
The blower fan for stating refrigerator is operated under the first predeterminated voltage, and each pressure difference detection device exports many in the first preset time
Individual first detected value, the first pressure difference corresponding with the pressure difference detection device exports for the pressure difference detection device
Maximum first detected value.
8. defrosting method according to claim 4, wherein
The initial value of pressure differential between the multiple different heights for obtaining the evaporator includes：
The refrigerator is when opening, and the refrigerator first runs well preset duration, after make the blower fan of the refrigerator default second
Operated under voltage, each pressure difference detection device exports multiple second detected values in the second preset time；
The average value of multiple second detected values of each pressure difference detection device output is calculated, and is examined with the pressure differential
Survey the average value for multiple second detected values that the corresponding initial value of device exports for the pressure difference detection device.
9. defrosting method according to claim 8, wherein
It is described to judge whether the evaporator needs defrost to include：
After each initial value is obtained or after completion defrost every time in the 3rd preset time, the blower fan normal work；
And after each initial value is obtained or in three preset time after completing defrost every time, make the blower fan default the 3rd
Operated under voltage, each pressure difference detection device exports multiple 3rd detected values in the 4th preset time, and makes the pressure
Maximum the 3rd detected value of power device for detecting difference output is a second pressure difference, to obtain multiple second pressures
Power difference；
If one or more second pressure differences are more than or equal to respective threshold value, the evaporator needs are judged
Defrost；Otherwise the preset time of blower fan normal work the 5th is made, Posterior circle makes the blower fan in the 3rd default electricity described in
Pressure operating, each pressure difference detection device exports multiple 3rd detected values in the 4th preset time, and makes the pressure
Maximum the 3rd detected value of device for detecting difference output is a second pressure difference, to obtain multiple second pressures
Difference；
5th preset time is less than the 3rd preset time；
Each threshold value is more than or equal to the initial value corresponding with the threshold value.
10. defrosting method according to claim 1, wherein
When the evaporator needs defrost, also close at least the inlet air door of the storing compartment of the refrigerator；
The refrigerator also includes temperature sensor, and the temperature sensor is arranged at the top of the evaporator, is configured to detection
The defrost temperature；
The pressure difference detection device is two, including first pressure device for detecting difference and second pressure device for detecting difference；
The first pressure device for detecting difference is configured to detect the pressure differential between the bottom end of the evaporator and upper end, and
It is configured to cooperatively work with heater strip described in one group of bottom, heater strip described in one group of bottom includes at least one
The heater strip；
The second pressure device for detecting difference is configured to detect the pressure differential between the center of the evaporator and upper end, and
It is configured to cooperatively work with the heater strip all above heater strip described in one group of bottom；
Each pressure difference detection device is differential pressure pick-up.
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| CN107192206B (en) | 2019-12-10 |
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