CN1105899C

CN1105899C - Frost removing apparatus

Info

Publication number: CN1105899C
Application number: CN95100869A
Authority: CN
Inventors: 猿田进
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 1994-02-28
Filing date: 1995-02-28
Publication date: 2003-04-16
Anticipated expiration: 2015-02-28
Also published as: JP2951193B2; TW305021B; JPH07239168A; KR950025391A; CN1112229A; KR0142739B1

Abstract

To perform defrosting of a cooler at a proper timing as power saving operation is effected by a method wherein when there is no need for defrosting operation at a preset defrosting timing, a defrost-starting timing is extended by a specified time. A control device (a defrosting control means, a door release memory means, a forced operation memory means, an outside air temperature determining means) 11 is caused to execute first extension operation, through which a defrost-starting timing is extended by a specified time, when a condition to need no defrosting operation is established in a case a preset cooler 15 defrost timing comes. The control device 11 is caused to execute second extension operation, through which the defrost starting timing is further extended by a specified time, the specified number of times. This constitution performs defrosting of the cooler 15 at a proper timing as power saving operation is executed.

Description

Defrosting device for refrigerator

The present invention relates to a kind of defrosting device for refrigerator that begins regularly to carry out the cooler Defrost operation with predefined defrosting.

In the past, a large amount of frosts was arranged if refrigerator and cooled is but long-pending on the device, just refrigerating efficiency descend, thereby with predefined defrosting regularly to the Defrost heater power supply, heating cooler, execution Defrost operation.

At this moment, the defrosting beginning is regularly set by following mode.

When (1) last time, Defrost operation was afterwards through the stipulated time;

When (2) reach setting the running time of adding up of refrigerating circulatory device compressor after Defrost operation last time (referring to Fig. 9 control flow chart);

(3) infer that according to environment temperature, door switch number of times and compressor operation rate best defrosting begins regularly.

But under the condition of (1), generally be to be that benchmark is determined the defrosting beginning regularly with long-pending frost the most abominable more service condition, and actual be to carry out Defrost operation in long-pending frost amount more after a little while, so efficiency is extremely low.

Under the condition of (2), can set the defrosting beginning regularly according to the load condition of cooler, but the judgment value that adds up of this moment is a prerequisite to pick and place food, the user long-term not or the door occasion crossed of switch not during operation, though long-pending frost amount is than lacking usually, but defrosting still in accordance with regulations timing is carried out, therefore can heterodyne.

As under the condition of (3), though can set best defrosting beginning regularly, but shortcoming is regularly will carry out a large amount of computings for calculating the defrosting beginning, requires the control device of refrigerator to have the function of high-speed computation and high-accuracy arithmetic, so control device complexity, too expensive.

The present invention In view of the foregoing, its purpose is to provide a kind of can realize energy-saving run with simple structure, and with the defrosting device for refrigerator of suitable timing to cooler defrosting.

Defrosting device for refrigerator of the present invention is provided with the defrosting control device that begins regularly to carry out the cooler Defrost operation in predetermined defrosting; At least store the door unlatching storage device that refrigerator doors is opened behind Defrost operation last time; At least the compressor of storing described cooler behind Defrost operation last time is carried out and is forced the forced service storage device of operation continuously; Detect or infer the environment temperature decision maker of refrigerator environment temperature; And, described defrosting control device constitutes, begin regularly to described defrosting, described door unlatching storage device and described forced service storage device are in the no record state, and the detection of described environment temperature decision maker or deduction temperature are in the set point of temperature scope, at this moment just carry out first deferred action, certain hour this defrosting beginning later on of promptly instructing predefined certain hour or trying to achieve according to the compressor operation rate, and, defrosting when finishing for this second deferred action begins regularly, when described door unlatching storage device and described forced service storage device still are in the no record state, then put rules into practice second deferred action of number of times is promptly instructed after predefined certain hour or certain hour this defrosting beginning later on of trying to achieve according to the compressor operation rate.

This occasion, described defrosting control device can also constitute, begin regularly to described defrosting, described door unlatching storage device and described forced service storage device are in the no record state, and detected temperatures that described environment temperature decision maker draws or deduction temperature are in the set point of temperature scope, at this moment just carry out first deferred action, i.e. instruction is this defrosting beginning after reaching certain hour the running time of adding up of described compressor, and the defrosting when finishing for described first deferred action begins regularly, when described door unlatching storage device and described forced service storage device still are in the no record state, then put rules into practice second deferred action of number of times, i.e. instruction this defrosting when reaching certain hour once more the running time of adding up of described compressor after begins.

And the environment temperature decision maker also can constitute according to the compressor operation rate infers environment temperature.

And, the defrosting control device can also be by carrying out deferred action, the defrosting control device that is instruction delay defrosting beginning constitutes, the temperature that temperature sensor detects the regulation installing space that described defrosting control device is installed is set simultaneously, and then the environment temperature decision maker constitutes the detected temperatures deduction environment temperature that obtains according to described temperature sensor.

In addition, the defrosting control device can also constitute, and when carrying out forced service during carrying out deferred action, just interrupts the timing of deferred action, finishes up to this forced service.

The defrosting device for refrigerator of first aspect present invention, begin regularly to predetermined defrosting, defrosting control device decision gate opens storage device and whether the forced service storing temperature is being in the no record state, and whether the judgement temperature of environment temperature decision maker is in prescribed limit.At this moment, after the last time Defrost operation, door was not opened, do not carry out forced service yet, when environment temperature is also in the set point of temperature scope in addition, just judge and do not need Defrost operation, carry out first deferred action, promptly instruct predefined certain hour or, and the defrosting when finishing for this first deferred action begins regularly according to the certain hour that the compressor operation rate the is tried to achieve beginning that defrosts later on, when door unlatching storage device and forced service storage device still are in the no record state, then judging does not need Defrost operation, carries out second deferred action, promptly instructs defrosting beginning behind the predefined certain hour or the certain hour of trying to achieve according to the compressor operation rate.

At this moment, the defrosting control device constitutes second deferred action of the number of times that puts rules into practice.Thereby, when not needing the condition that defrosts to continue, just can carry out one time first deferred action, the moment execution Defrost operation that finishes is carried out in number of times second deferred action that puts rules into practice again in second deferred action of stipulated number.

And the defrosting condition establishment when beginning to be timed to that defrosts, the control device that at this moment defrosts is just judged needs Defrost operation, carries out in deferred action and carries out Defrost operation the finish time.Therefore, can energy-saving run, and carry out Defrost operation with suitable timing.

The defrosting device for refrigerator of second aspect present invention, when the defrosting control device was carried out deferred action, instruction is the defrosting beginning after reaching certain hour the running time of adding up of compressor.Therefore, can correctly set the defrosting beginning regularly.

The defrosting device for refrigerator of third aspect present invention, the environment temperature decision maker is inferred environment temperature according to the compressor operation rate, thereby can omit the special temperature sensor that the testing environment temperature is used.

The defrosting device for refrigerator of fourth aspect present invention, the environment temperature decision maker is according to inferring environment temperature to being equipped with as the resulting detected temperatures of the temperature sensor of regulation installing space detected temperatures of the defrosting control device of defrosting control device, thereby does not need to draw from installing space the lead-in wire of the temperature sensor that the testing environment temperature uses.

The defrosting device for refrigerator of fifth aspect present invention, when the defrosting control device carries out forced service term of execution of deferred action, just interrupt the timing of deferred action, till this forced service finishes, thereby this problem of cooler that can avoid the Defrost operation heating sharply to cool off because of forced service.

Fig. 1 is the flow chart of the control device of first embodiment of the invention.

Fig. 2 is the schematic diagram of refrigerator electrical structure.

Fig. 3 is the sequential chart when not carrying out deferred action.

Fig. 4 is the sequential chart when carrying out twice deferred action.

Fig. 5 is the sequential chart when putting rules into practice number of times deferred action.

Fig. 6 is the flow chart of expression second embodiment of the invention.

Fig. 7 is the flow chart of expression third embodiment of the invention.

Fig. 8 is the sequential chart when carrying out a deferred action.

Fig. 9 is the flow chart of the existing example of expression.

Below referring to figs. 1 through Fig. 5 one embodiment of the invention is described.Each electrical equipment that is provided with in the refrigerator and the distribution between the control device represented in Fig. 2 summary.Among Fig. 2, form refrigerating chamber 2, refrigerating chamber 3 and vegetable compartment 4 in the refrigerator body 1, be respectively equipped with the

door

5,6,7 of each chamber 2,3,4 of locking.Adorning the door switch 8,9,10 that is in closed on-state when

door

5,6,7 is opened in each chamber 2,3,4 respectively.During these switch connections, connection signal is imported the control device 11 as defrosting control device, door unlatching storage device, forced service storage device and environment temperature decision maker respectively.Door 5 fronts at refrigerating chamber 2 are disposing forced service button 12 and indicator lamp 13.Forced service button 12 pressed make it to connect, control device 11 is promptly given in the forced service instruction.In addition, in the forced service process, manage to make indicator lamp 13 bright by control device 11.

The depth place of refrigerating chamber 2 is formed with cooler chamber 14.Dispose cooler 15 and Defrost heater 16 in this cooler chamber 14.Defrost heater 16 is along with the power supply of control device 11, to cooler 15 heating.The top of cooler chamber 14 is provided with fan electromotor 17, the instruction of these fan electromotor 17 receiving control devices 11 and when driving, the air of cooling is delivered in the refrigerating chamber 2 by the blower fan 17a that this fan electromotor 17 drives in the cooler chamber 14.Be provided with cryogenic temperature sensor 18 in the refrigerating chamber 2, these cryogenic temperature sensor 18 detected temperature (cryogenic temperature) offer control device 11.

Cold wind blow-off outlet 19 to refrigerating chamber 3 disposes electric motor driven air door 20.This air door 20 is according to the instruction of control device 11, controlledly is in the open position of open cold wind outlet 19 and closes the position, pass of cold wind blow-off outlet 19.Be provided with refrigerated storage temperature sensor 21 in the refrigerating chamber 3, these refrigerated storage temperature sensor 21 detected temperature (refrigerated storage temperature) offer control device 11.

Dispose compressor 23 in the Machine Room 22, compressor 23 begins to drive according to the instruction of control device 11, and refrigerant is sent into cooler 15, makes this cooler 15 coolings.

Control device 11 is provided with temperature sensor, is contained in the not shown enclosure space.This temperature sensor also detects the temperature of this enclosure space.This control device 11 is carried out following control:

(1) temperature of the refrigerating chamber 2 that is detected by cryogenic temperature sensor 18 is more than-20 ℃ the time, and if drive compression machine 23 and fan electromotor 17 below-24 ℃, then stop compressor 23 and fan electromotor 17.

(2) temperature of the refrigerating chamber 3 that is detected by refrigerated storage temperature sensor 21 makes air door 20 be in open position more than 5 ℃ the time, if below 3 ℃, air door 20 is in closes the position.

(3) running time of accumulating operation compressor 23, when reached the stipulated time this running time of adding up, then to the Defrost heater power supply, heating cooler 15 was carried out Defrost operation.

When (4) forced service button 12 becomes on-state, just force drive compression machine 23, carry out forced service, up to through certain hour (for example 90 minutes) or till pushing the forced service button once more and being in on-state.During carrying out forced service, indicator lamp 13 is bright.

(5) when above-mentioned (3) defrosting beginning rated condition is regularly set up, carry out deferred action, defrosting beginning behind the instruction certain hour.

The following describes the effect of above-mentioned formation.Fig. 1 shows the action flow chart of control device 11.Control device 11 is at first opened sign and forced service sign zero clearing (step S1) from door, makes accumulation timer zero clearing (step S2) again.Then, in common refrigerating operaton, when judgement is opened according to door switch 8-10, make a unlatching flag set (step S3), when pressing the 12 execution forced services of forced service button, make the forced service flag set.Compressor 23 is connected drive accumulation timer (step S7, S8), makes accumulation timer stop timing (step S7, S9) at off period, calculates adding up running time of compressor 23 thus.Next, when the clocking value that adds up for example reaches 10 hours (step S10), just judge roughly that the defrosting beginning regularly arrives, but, avoid the defrosting beginning whether judgement carries out first deferred action, instruction delay certain hour by following control.

Door unlatching sign is in reset mode always in refrigeration is controlled usually, and when promptly door 5-7 was in closed condition always, the long-pending white amount of cooler 15 was less, even the instruction delay Defrost operation does not have problem yet.But it is out-of-date to open at door 5-7, and a large amount of outside airs enter in the refrigerator, and cooler 15 just presents to amass a large amount of frosts, thereby at this moment if the instruction delay Defrost operation just has problem.Equally, when having carried out forced service, the heat exchange amount of cooler 15 increases, and long-pending white speed improves, if problem will take place the instruction delay Defrost operation.

Therefore, control device 11 accumulation timer through 10 hours situation under, judge whether to be equipped with and open a sign or a forced service sign (step S11), no matter be equipped with which sign, at this moment just judging needs Defrost operation, after the sign zero clearing, the execution Defrost operation (step S23, S24).

When not putting any sign, just, infer environment temperature, judge that the environment temperature inferred is whether in the set point of temperature scope (for example 20 ℃-30 ℃) (step S12) according to the detected temperatures of not shown temperature sensor.Out-of-date deduction environment temperature just makes the sign zero clearing beyond the set point of temperature scope time, carries out Defrost operation (step S23, S24) (with reference to Fig. 3) then.This is that the running rate of refrigerator is low, does not defrost for a long time because when environment temperature is lower than the set point of temperature scope, contain under the washy food occasion in preservation, the frost that amasss on cooler 15 becomes the ice shape that melts for solid-state difficulty, makes the refrigeration performance variation, and the instruction delay Defrost operation has problem.And when environment temperature is higher than the set point of temperature scope, the running rate height of compressor 23, the heat exchange amount of cooler 15 (refrigerating capacity) is big, the long-pending easily frost of cooler 15, at this moment the instruction delay Defrost operation also has problem.

The deduction of above-mentioned environment temperature is to obtain according to the temperature of the set not shown installing space that temperature sensor detected (enclosure space) of control device 11 and the relation of environment temperature.The temperature of this installing space is subjected to the influence of environment temperature and relative variability, therefore can infer environment temperature according to the temperature of installing space.

In common refrigerating operaton process, when always is that a 5-7 is in closed condition and forced service button 12 is in off working state, and the environment temperature of inferring is in the set point of temperature scope time, control device 11 is just judged does not need Defrost operation, make the timing zero clearing, simultaneously, starting real-time clock (step S13, S14), by making refrigerating operaton certain time (for example 100 minutes), carry out first deferred action (step S19).

During carrying out first deferred action, control device 11 is put a unlatching sign (step S15, S16) when door 5-7 opens, put forced service sign (step S17, S18) when pressing forced service button 12.Like this, when first deferred action end, and to the defrosting beginning regularly, control device 11 just judges whether to be equipped with a unlatching sign or a forced service sign (step S20), when being equipped with sign, just carries out Defrost operation (step S24).In addition, when first deferred action finishes, do not carry out the deduction of environment temperature.This is because under the environment for use of general family, room temperature can sharply not change tens of ℃, so, as long as begin regularly to infer that environment temperature is just enough in initial defrosting.

Subsequent, by the time the defrosting that first deferred action finishes begins regularly, when the defrosting condition did not also possess, control device 11 was carried out second deferred action, after the defrosting beginning of certain hour (100 minutes) back.And the defrosting that finishes to this second deferred action begins regularly, when the defrosting condition does not possess, just repeats this second time-delay moving (step S22).At this moment, the defrosting when second deferred action finishes begins regularly, when control device 11 is opened sign or forced service sign and judged that needs are made Defrost operation according to door (step S20), just carries out Defrost operation (with reference to Fig. 4).

This control device 11 reaches count value because of repeating second deferred action, when promptly second deferred action reaches stipulated number (step S21, S22), just judges the establishment of defrosting condition, carries out Defrost operation (with reference to Fig. 5).At this moment, the stipulated number of second deferred action can continue to be in the Defrost operation that a 5-7 closes and the idle state that do not have a forced service can be brought into play refrigeration performance and economize on electricity two aspect maximum efficiencies down according to refrigerator and obtains at interval.That is to say, be set at for example 24 hours occasion at interval at Defrost operation, usually be 10 hours the running time of adding up of the compressor 23 of refrigerating operaton, after this then carry out three each deferred action of 100 minutes (one time first deferred action, twice second deferred action), Defrost operation is set at interval surpasses 24 hours, therefore the regulation of this occasion second deferred action execution number of times is 2 times.In the occasion that is scaled the real time running time of adding up with compressor 23, can be the running rate of environment temperature according to the condition that postpones the defrosting beginning, try to achieve and the suitable real time of 10 hours running times of adding up at 20 ℃ of-30 ℃ of this condition lower compression machines 23.

Here, present embodiment manages to judge whether to postpone the defrosting beginning when deferred action finishes.This be because, for the formation of opening or carry out immediately Defrost operation during the deferred action with door 5-7 for the operation of forced service button 12, the words of opening a 5-7 if want to refrigerate store food during the deferred action, will carry out Defrost operation immediately, and cause that Defrost operation does not finish just can not refrigerate the problem of store food.Equally, want during the deferred action to carry out forced service and operate forced service button 12, will carry out Defrost operation immediately, and the problem that can not carry out forced service is arranged.

In addition, present embodiment also manages carrying out Defrost operation constantly, will be used to judge whether postpone to defrost the sign zero clearing of beginning the finish time in deferred action.This be because, during the Defrost operation door 5-7 is opened, take out and when putting into food, the air that contains moisture enters in the refrigerator in a large number, just afterwards in the refrigerating operaton, and a large amount of long-pending frosts on the cooler 15, therefore in the middle of the Defrost operation, also need the switch of inspection door 5-7.

Utilize said structure, begin regularly to predefined defrosting, when not needing the condition that cooler 15 carries out Defrost operation kept, then carry out first deferred action that postpones certain hour, and, by the time the defrosting when this deferred action finishes begins regularly, when the condition that does not need to carry out Defrost operation is still kept, then further carry out second deferred action, carry out deferred action until reaching stipulated number, thereby the condition that does not need to carry out Defrost operation just can postpone the big Defrost operation of power consumption when keeping as far as possible, reaches the purpose of economize on electricity; In a single day and possess the condition that needs Defrost operation, just can carry out Defrost operation, and then can keep the cooling performance of cooler 15 at common refrigerating operaton or deferred action concluding time.Therefore, be different from conventional example from last time Defrost operation defrost again through the stipulated time later on or compressor adds up and defrosts when reaching setting running time, but by carrying out Defrost operation, thereby can improve efficiency with rational timing.In addition, be different from yet and infer regularly the sort of of defrosting beginning, with regard to the function of control device 11 and do not require high-speed computation and high-accuracy arithmetic function, thereby control device 11 is uncomplicated not expensive yet.

The power savings of present embodiment for the refrigerator of 400 liter levels, is 24 hour or more if set the defrost interval real time with regard to concrete numerical value, and then every month can reduce power consumption 2KW; If setting the defrost interval real time is more than 72 hours, then every month can reduce power consumption 4-5KW.

Fig. 6 illustrates the flow chart of the control device 11 of second embodiment of the invention.The difference of this second embodiment and first embodiment is the time delay of carrying out deferred action to judge the running time of adding up of compressor 23.

That is to say, control device 11 is judged according to sign when defrosting is timed to and is not carried out Defrost operation (step S11, S12), this hour counter begins counting (step S13), in count value is that defrosting when just judging that refrigeration finished usually at 1 o'clock begins regularly, judges whether to postpone defrosting beginning (step S14, S15) according to the environment temperature of inferring.And when count value be 2 when above, then judge when deferred action finishes for the defrosting beginning regularly, open a sign and a forced service state according to having or not again, judging whether to postpone defrosting and beginning (step S14, S16).At this moment, in order to the constant value of comparing with the accumulation timer value in the step 11, be 0 o'clock to be 10 hours (common refrigeration control) at counting, counting be 1 when above (entering deferred action) be set at 100 minutes.

By means of this structure, defrosting when finishing for deferred action begins regularly, the accumulation timer that compressor operating time is added up that judging whether to postpone to defrost beginning is required, can be used for and judge the defrosting condition and be used for the refrigerating operaton action, thereby can obtain the action effect identical with first embodiment, can reach the structure of simplifying control device 11, the purpose that shortens development time and reduction cost simultaneously.

Fig. 7 illustrates the flow chart of third embodiment of the invention control device.The 3rd embodiment is to carry out during the deferred action when the execution forced service with the first embodiment difference, just interrupts the deferred action timing (step S17, S18, S19, S20) during the forced service.

According to this formation, when carrying out forced service during the execution deferred action, as shown in Figure 8, the stop timing of the deferred action stop timing with forced service can be staggered certainly, therefore can prevent in the upright this problem of Defrost operation of carrying out that connects of forced service concluding time.

The invention is not restricted to the foregoing description, also can do following distortion or expansion.

The defrosting control device also can be made of the device of common execution refrigerating operaton, the device carrying out the device of first deferred action and carry out second deferred action.

Since when door is opened in the refrigerator temperature change, thereby door opens storage device and also can constitute to change according to this and infer.

The running rate of compressor 23 changes with environment temperature, thereby the environment temperature decision maker also can constitute according to this running rate deduction.

Can know according to above explanation, by means of defrosting device for refrigerator of the present invention, can obtain following effect:

According to first aspect present invention, the defrosting control device is when beginning regularly for predetermined defrosting The time, do not need the condition of Defrost operation to set up, it is certain at this moment just to carry out this defrosting beginning of delay First deferred action of time, and the defrosting when finishing for this first deferred action is opened Begin regularly, when not needing the condition of Defrost operation still to set up, the number of times that puts rules into practice make again this Second deferred action that the defrosting time started postpones, thereby reaching energy-conservation fortune with simple structure In the time of the row purpose, can also defrost to cooler with rational timing.

According to second aspect present invention, the defrosting when finishing for deferred action begins regularly not When the condition that need to defrost is still set up, just make this defrosting begin to be delayed to the cumulative operation of compressor Time reaches certain hour, thereby can correctly set the defrosting beginning regularly.

According to third aspect present invention, the environment temperature decision maker pushes away according to the compressor operation rate Abscission ring border temperature, thereby can save dedicated temperature sensor for detection of environment temperature.

According to fourth aspect present invention, the environment temperature decision maker is according to defrosting to conduct is installed The temperature that the regulation installing space temperature of the defrosting control device of control device detects passes Therefore the temperature that sensor detects is inferred environment temperature, does not need in order to the testing environment temperature The lead of the temperature sensor of degree is derived from enclosure space.

According to fifth aspect present invention, the defrosting control device is carried out during carrying out deferred action During forced service, the just timing of interrupt latency action, until till this forced service end, because of And this asking of cooler that can avoid the Defrost operation heating to be cooled off rapidly by forced service Topic.

Claims

1. defrosting device for refrigerator is characterized in that having:

Begin regularly to carry out the defrosting control device of cooler Defrost operation with predefined defrosting;

At least write down the door unlatching storage device of Defrost operation last time refrigerator doors unlatching later on;

At least described chiller compressor is carried out the forced service storage device of forcing continuous operation after writing down Defrost operation last time;

Detect or infer the environment temperature decision maker of refrigerator environment temperature;

Described defrosting control device constitutes, when beginning regularly for described defrosting, described door unlatching storage device and described forced service storage device are in the no record state, and detected temperatures that described environment temperature decision maker obtains or deduction temperature are in the set point of temperature scope, at this moment just carry out first deferred action of the certain hour make this defrosting begin to postpone predefined certain hour or to try to achieve according to the compressor operation rate, and the defrosting when finishing for this first deferred action begins regularly, when described door unlatching storage device and described forced service storage device still are in the no record state, second deferred action of the certain hour that makes this defrosting begin to postpone predefined certain hour again or try to achieve according to the compressor operation rate of the number of times that just puts rules into practice.

2. defrosting device for refrigerator is characterized in that having:

Described defrosting control device constitutes, when beginning regularly for described defrosting, described door unlatching storage device and described forced service storage device are in the no record state, and detected temperatures that described environment temperature decision maker obtains or deduction temperature are in the set point of temperature scope, this just carries out first deferred action that reaches certain hour the running time of adding up that makes this defrosting begin to be delayed to described compressor, and the defrosting when finishing for this first deferred action begins regularly, when described door unlatching storage device and described forced service storage device still were in the no record state, this defrosting that makes again of the number of times that just puts rules into practice began to be delayed to second deferred action that reaches certain hour the running time of adding up of described compressor.

3. defrosting device for refrigerator as claimed in claim 1 or 2 is characterized in that, the environment temperature decision maker constitutes according to the running rate of compressor infers environment temperature.

4. defrosting device for refrigerator as claimed in claim 1 or 2 is characterized in that,

The defrosting control device is made of the defrosting control device of carrying out the deferred action that postpones the defrosting beginning;

Has the temperature sensor that the temperature to the regulation assembly space that is equipped with described defrosting control device is detected;

The environment temperature decision maker constitutes the detected temperatures that obtains according to described temperature sensor and infers environment temperature.

5. defrosting device for refrigerator as claimed in claim 1 or 2 is characterized in that, the defrosting control device constitutes, and when carrying out forced service term of execution of deferred action, just interrupts the timing of deferred action, till this forced service finishes.