CN104457106A

CN104457106A - Defrosting method of direct-cooling refrigerator and direct-cooling refrigerator

Info

Publication number: CN104457106A
Application number: CN201410629658.9A
Authority: CN
Inventors: 韩静波; 卢玉波
Original assignee: Hisense Shandong Refrigerator Co Ltd
Current assignee: Hisense Shandong Refrigerator Co Ltd
Priority date: 2014-11-10
Filing date: 2014-11-10
Publication date: 2015-03-25
Anticipated expiration: 2034-11-10
Also published as: CN104457106B

Abstract

The embodiment of the invention provides a defrosting method of a direct-cooling refrigerator and the direct-cooling refrigerator. Whether a heater is turned on or not or the time duration for turning on the heater can be selected according to different working conditions of the direct-cooling refrigerator. The defrosting method includes the steps of not turning on the heater when the direct-cooling refrigerator meets the working condition that the working environment temperature of the direct-cooling refrigerator is smaller than a preset environment temperature threshold value, and/or the accumulated door opening time duration of the direct-cooling refrigerator is smaller than a preset time duration threshold value, and/or the temperature in the direct-cooling refrigerator is larger than or equal to a preset indoor temperature threshold value, and controlling the heater to be turned on by different time durations when the direct-cooling refrigerator meets the working condition that the working environment temperature of the direct-cooling refrigerator is larger than or equal to the preset environment temperature threshold value, and/or the accumulated door opening time duration of the direct-cooling refrigerator is larger than or equal to the preset time duration threshold value, and/or the temperature in the direct-cooling refrigerator is smaller than the preset indoor temperature threshold value. The defrosting method is used for defrosting the direct-cooling refrigerator.

Description

A kind of Defrost method of direct cooling refrigerator and direct cooling refrigerator

Technical field

The present invention relates to direct cooling refrigerator field, particularly relate to a kind of Defrost method and direct cooling refrigerator of direct cooling refrigerator.

Background technology

Direct cooling refrigerator, owing to having higher cost performance and lower fault rate, is therefore a kind of refrigerator that China's sales volume and social owning amount are maximum.Evaporimeter due to direct cooling refrigerator is arranged in refrigerator inwall, therefore in the use procedure of direct cooling refrigerator, evaporimeter reduces the temperature of direct cooling refrigerator inwall, then carries out exchange heat by the temperature in the inwall of direct cooling refrigerator and refrigerator compartment, the temperature of refrigerator inwall can be caused so lower.Because the food putting into refrigerator contains abundant steam, and in the process of the switch gate of refrigerator, water in air vapour also can enter in refrigerator, and these steam can condense into frost when running into colder refrigerator inwall.If when frosting is more on refrigerator inwall, seriously can hinder the heat exchange of air and object in evaporimeter and refrigerator, this just brings the drawback of the significantly waste of reduction, electric energy of Energy Efficiency Ratio.

In prior art, usually heater is set on an evaporator, in the course of work of direct cooling refrigerator, after refrigerator work preset duration, close compressor simultaneously heater fixes duration, make heater work, by the frost fusing condensed on refrigerator inwall, and then reach the object of defrost, after defrost completes, open compressor, refrigerator proceeds work.But because direct cooling refrigerator judges whether to need to carry out defrost according to the time of continuous firing, and in practical application, the environment temperature of refrigerator work, the temperature added up in enabling duration and refrigerator all can affect the frosting degree on refrigerator inwall, if the frosting degree on refrigerator inwall is little, refrigerator may not need defrost, but heater still can be opened after direct cooling refrigerator work preset duration, causes the waste of electric energy; If the frosting degree on refrigerator inwall is less, needed for refrigerator, the defrost time is shorter, but because heater needs to open fixing duration, the post-heater that defrost may be caused so to have completed still in work, makes the temperature of refrigerator inside rise, causes the food in refrigerator apt to deteriorate, when compressor is again opened and is carried out work simultaneously, need to use more electric energy, the temperature in refrigerator could be reduced to the temperature of setting, cause the waste of electric energy; If refrigerator inwall frosting degree is more, the defrost time that refrigerator may need is longer, but fixing duration only opened by heater, defrost may be caused so also not complete heater quit work, frost remaining on refrigerator inwall still can hinder the heat exchange of air and object in evaporimeter and direct cooling refrigerator, does not reach the effect of defrost completely.

Summary of the invention

Whether embodiments of the invention provide a kind of Defrost method and direct cooling refrigerator of direct cooling refrigerator, can according to the difference of the condition of work of refrigerator work, select heater to open or the unlatching duration of heater, and then save electric energy, improve defrost effect.

For achieving the above object, embodiments of the invention adopt following technical scheme:

On the one hand, the embodiment of the present invention provides a kind of Defrost method of direct cooling refrigerator, and described direct cooling refrigerator comprises heater, and described method comprises:

When the time of described direct cooling refrigerator work is more than or equal to the first preset duration, if the condition of work of described direct cooling refrigerator meets the first preset rules, do not open described heater; If the condition of work of described direct cooling refrigerator meets the second preset rules, control described heater and open different duration.

Wherein, described condition of work comprises the temperature in environment temperature and/or accumulative enabling duration and/or direct cooling refrigerator; Described first preset rules is that the environment temperature that described direct cooling refrigerator carries out work is less than default environment temperature threshold value, and/or the accumulative enabling duration of described direct cooling refrigerator is when being less than preset duration threshold value, and/or the temperature in described direct cooling refrigerator be more than or equal to preset between inside temperature thresholds; Described second preset rules is that the environment temperature that described direct cooling refrigerator carries out work is more than or equal to default environment temperature threshold value, and/or the accumulative enabling duration of described direct cooling refrigerator is when being more than or equal to preset duration threshold value, and/or the temperature in described direct cooling refrigerator be less than preset between inside temperature thresholds.

On the other hand, the embodiment of the present invention provides a kind of direct cooling refrigerator, and described direct cooling refrigerator comprises:

Heater, described heater is used for heating, and described direct cooling refrigerator inner wall temperature is raised.

Control unit, described control unit is used for when the time of described direct cooling refrigerator work is more than or equal to the first preset duration, if the condition of work of described direct cooling refrigerator meets the first preset rules, does not open described heater; If the condition of work of described direct cooling refrigerator meets the second preset rules, control described heater and open different duration.

The Defrost method of the direct cooling refrigerator that the embodiment of the present invention provides and direct cooling refrigerator, described Defrost method is when the time of described direct cooling refrigerator work is more than or equal to the first preset duration, if the condition of work of described direct cooling refrigerator meets the first preset rules, do not open described heater; If the condition of work of described direct cooling refrigerator meets the second preset rules, control described heater and open different duration, control described heater and open different duration, described condition of work comprises the temperature in environment temperature and/or accumulative enabling duration and/or direct cooling refrigerator.Compared to prior art, because described first preset rules is that the environment temperature that described direct cooling refrigerator carries out work is less than default environment temperature threshold value, and/or the accumulative enabling duration of described direct cooling refrigerator is when being less than preset duration threshold value, and/or the temperature in described direct cooling refrigerator be more than or equal to preset between inside temperature thresholds, described second preset rules is that the environment temperature that described direct cooling refrigerator carries out work is more than or equal to default environment temperature threshold value, and/or the accumulative enabling duration of described direct cooling refrigerator is when being more than or equal to preset duration threshold value, and/or the temperature in described direct cooling refrigerator be less than preset between inside temperature thresholds, so the embodiment of the present invention can meet the first preset rules or the second preset rules according to direct cooling refrigerator condition of work, know described direct cooling refrigerator by inference the need of carrying out defrost, namely the number of the frosting degree of inwall after work first preset duration of direct cooling refrigerator is known by inference, and then the number of frosting degree according to cold refrigerator inwall, not heater or control heater is selected to open different duration, namely when frosting degree on direct cooling refrigerator inwall is little, when not needing to carry out defrost, not heater, save electric energy, when on direct cooling refrigerator inwall, frosting degree is less, when needed for refrigerator, the defrost time is shorter, it is long when control heater is opened shorter, the post-heater that defrost is completed can not work on, and then direct cooling refrigerator internal temperature can not be caused to rise, avoiding compressor opens when carrying out work again, needs to use more electric energy to reduce the temperature of refrigerator inside, has saved electric energy, when on direct cooling refrigerator inwall, frosting degree is more, when needed for refrigerator, the defrost time is longer, control heater opens longer duration, makes direct cooling refrigerator can fully defrost, and the remaining frost after minimizing defrost on direct cooling refrigerator inwall, improves defrost effect.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

The structural representation of a kind of heater that Fig. 1 provides for the embodiment of the present invention;

The structural representation of the another kind of heater that Fig. 2 provides for the embodiment of the present invention;

The flow chart of the Defrost method of the another kind of direct cooling refrigerator that Fig. 3 provides for the embodiment of the present invention;

The structural representation of a kind of direct cooling refrigerator that Fig. 4 provides for the embodiment of the present invention.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

The embodiment of the present invention provides a kind of Defrost method of direct cooling refrigerator, and described direct cooling refrigerator comprises heater, and described method comprises:

After direct cooling refrigerator work first preset duration, refrigerator inwall may have accumulated certain frosting degree, but the frosting degree of refrigerator inwall is different under different operating condition, likely frosting degree is little, do not need to carry out defrost, also be likely that on refrigerator inwall, frosting degree is more simultaneously, need long-time heater, ensure that defrost is complete.But the measurement of the frosting degree after refrigerator work first preset duration is comparatively inconvenient, so need according to the condition of work of refrigerator in the first preset duration, infer the frosting degree of refrigerator, therefore, after direct cooling refrigerator work first preset duration, can judge that condition of work meets the first preset rules or the second preset rules, then according to the rule that condition of work meets, infer the frosting degree of direct cooling refrigerator inwall under various operating conditions, then according to the frosting degree of knowing by inference, not heater or control heater is selected to open different duration.

So, when on direct cooling refrigerator inwall, frosting degree is little, not heater, avoids the unlatching of heater when not needing defrost, has saved electric energy; When on direct cooling refrigerator inwall, frosting degree is less, control heater opens the short period, and the post-heater that defrost is completed can not work on, and direct cooling refrigerator internal temperature can not be caused to rise, saved electric energy; When frosting degree is more on direct cooling refrigerator inwall, the heater long period, make heater can fully defrost, reduce the remaining frost on direct cooling refrigerator inwall after defrost, improve defrost effect.

Optionally, described condition of work comprises described environment temperature.Described first preset rules is that environment temperature is less than default environment temperature threshold value; Described second preset rules is that environment temperature is more than or equal to described default environment temperature threshold value.If now the condition of work of direct cooling refrigerator meets the first preset rules, do not open described heater, be when described environment temperature is less than default environment temperature threshold value, do not open described heater; If the condition of work of described direct cooling refrigerator meets the second preset rules, control described heater and open different duration, be when environment temperature is more than or equal to described default environment temperature threshold value, control described heater and continue unlatching second preset duration.

Example, when the time of described direct cooling refrigerator work is more than or equal to the first preset duration, illustrate that refrigerator has run the long period, may need to carry out defrosting operation.But due to environment temperature lower time, air humidity is less, and the steam entered in refrigerator is less, even if refrigerator has run the first preset duration, but the frosting degree on refrigerator inwall is less, does not need to carry out defrosting operation.If now refrigerator still heater carry out defrosting operation, the temperature of refrigerator inside can be caused to rise, make the food in refrigerator apt to deteriorate, when making compressor again open to carry out work simultaneously, need to use more electric energy, temperature in refrigerator could be reduced to the temperature of setting, cause the waste of electric energy; When environment temperature is higher, air humidity is larger, the steam entered in refrigerator is more, after making refrigerator work first preset duration, frosting degree is more, if now not the time of heater or heater shorter, then defrost can be caused incomplete, remaining frost still can hinder the heat exchange of evaporimeter and refrigerator inside megadyne temperature degree, does not play the effect of defrost.Therefore, when the time of described refrigerator work is more than or equal to the first preset duration, also need to judge whether environment temperature is more than or equal to default environment temperature threshold value, and when described environment temperature is less than default environment temperature threshold value, do not open described heater; When environment temperature is more than or equal to described default environment temperature threshold value, controls described heater and continue unlatching second preset duration.First preset duration pre-sets, can be identical with the preset duration that refrigerator in prior art runs, and also can set as the case may be in actual applications, the embodiment of the present invention does not limit this.Described second preset duration pre-sets, can be identical with the set time that the heater of refrigerator in prior art is opened, also can be longer, and can set as the case may be in actual applications, the embodiment of the present invention does not limit this.Pre-set during described default environment temperature threshold value, can set as the case may be in practical application, the embodiment of the present invention does not limit this.

Optionally, described condition of work comprises described environment temperature and described accumulative enabling duration.Described first preset rules is: environment temperature is less than default environment temperature threshold value, and in the first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than the first preset duration threshold value; Described second preset rules is: environment temperature is less than described default environment temperature threshold value, and in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value; Or environment temperature is more than or equal to described default environment temperature threshold value, and in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value; Or environment temperature is more than or equal to described default environment temperature threshold value, and in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value.

Now, if the condition of work of described direct cooling refrigerator meets the first preset rules, do not open described heater, be when described environment temperature is less than described default environment temperature threshold value, with when the accumulative enabling duration of described direct cooling refrigerator is less than the first preset duration threshold value in described first preset duration, do not open described heater; If the condition of work of described direct cooling refrigerator meets the second preset rules, control described heater and open different duration, be when described environment temperature is less than described default environment temperature threshold value, with when the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value in described first preset duration, controls described heater and continue unlatching the 3rd preset duration; When described environment temperature is more than or equal to described default environment temperature threshold value, with when the accumulative enabling duration of described direct cooling refrigerator is less than the second preset duration threshold value in described first preset duration, control described heater and continue unlatching second preset duration; When described environment temperature is more than or equal to described default environment temperature threshold value, with when the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value in described first preset duration, controls described heater and continue to open described 4th preset duration; Described 3rd preset duration is less than the second preset duration, and described second preset duration is less than described 4th preset duration.

Example, when environment temperature is less than described default environment temperature threshold value, humidity in air is lower, the steam entered in refrigerator is less, frosting degree on possible refrigerator inwall is less, but if in the first preset duration of refrigerator continuous service, the door of refrigerator opens for a long time, steam in air continually can enter refrigerator inside, and the frosting degree on refrigerator inwall still may be made more; If in the first preset duration of refrigerator continuous service, the door of refrigerator is not almost opened, the steam entering refrigerator inside is less, makes the frosting degree on refrigerator inwall less.So when environment temperature is less than described default environment temperature threshold value, also need to judge in the first preset duration, whether the accumulative enabling duration of refrigerator is less than the first preset duration threshold value, described accumulative enabling duration is the cumulative sum of the time continued that refrigerator opens the door at every turn, and when the accumulative enabling duration of described refrigerator is less than described first preset duration threshold value in described first preset duration, do not open described heater; When in described first preset duration, the accumulative enabling duration of described refrigerator is more than or equal to described first preset duration threshold value, control heater opens the 3rd preset duration.

Optionally, although when environment temperature is more than or equal to described default environment temperature threshold value, needs to open described heater and carry out defrosting operation, in the first preset duration, the accumulative enabling duration of refrigerator is different, and frosting degree can be caused to have difference.Such as, when environment temperature is more than or equal to described default environment temperature threshold value, if the door of refrigerator opens for a long time, the steam in air continually can enter refrigerator inside, makes the frosting degree on inwall comparatively serious; If the door of refrigerator is closed for a long time, then it is less to follow the steam that air enters in refrigerator, makes the frosting degree on inwall not be very serious.No matter if the frosting degree on inwall is how many, all start heater preset duration, when frosting degree is relatively many, the incomplete situation of defrost may be there is, when frosting degree is relatively less, may occur that defrost completes, heater is also in the situation of carrying out heating.Therefore, when being more than or equal to described default environment temperature threshold value when environment temperature, also need to judge in the first preset duration, whether the accumulative enabling duration of described refrigerator is more than or equal to the second preset duration threshold value; When the accumulative enabling duration of described refrigerator is less than described second preset duration threshold value in described first preset duration, opens described heater and continue described second preset duration; When the accumulative enabling duration of described refrigerator is more than or equal to described second preset duration threshold value in described first preset duration, opens described heater and continue described 4th preset duration.

Simultaneously, due to when in air, humidity is larger, the steam of refrigerator inside is more abundant, the easier frosting on refrigerator inwall of steam, even if refrigerator doors is seldom opened, but the steam entering refrigerator inside when opening refrigerator doors is more at every turn, the frosting degree of refrigerator inwall is still more, and air humidity less time, even if refrigerator doors is usually opened, but the steam entered in refrigerator is still abundant not, therefore air humidity less and refrigerator doors is often opened time, it is larger that the frosting degree of refrigerator inwall is less than air humidity, but the frosting degree of refrigerator inwall when seldom opening refrigerator doors, therefore the 3rd preset duration is less than the second preset duration, ensure in both cases can both defrost complete, and excessively can not raise the temperature of refrigerator inside.So, avoid when frosting degree is less on inwall, carry out the waste of the electric energy that defrosting operation causes; When avoiding that on inwall, frosting degree is more, the refrigerator defrost time is shorter, the problem significantly reduced of the Energy Efficiency Ratio of the evaporimeter caused simultaneously.

And and due to when in air, humidity is larger, the steam of refrigerator inside is more abundant, if refrigerator doors is usually opened, more steam is made to enter refrigerator, in refrigerator, steam fills, and easilier on refrigerator inwall, forms frosting, and now the frosting degree of refrigerator inwall is comparatively serious, heater is needed to open the long period, so select to allow heater open the 4th preset duration; Even and if in air humidity comparatively large, if refrigerator doors is infrequently opened, the steam entering refrigerator inside is less, thus frosting degree not especially severe, but frosting degree is now still less more than air humidity and refrigerator doors is usually opened time refrigerator inwall frosting degree.This is because when air humidity is large, even if refrigerator doors is infrequently opened, but now the steam of refrigerator inside is still more, so inwall frosting is more, the time needing heater to open is longer, selection allows heater open the second preset duration, ensure in all cases can both defrost complete, and excessively can not raise the temperature of refrigerator inside.So, when the frosting degree on refrigerator inwall is comparatively serious, the opening time of heater is longer, can ensure that defrost is complete; When the frosting degree on refrigerator inwall is not especially severe, the opening time of heater is shorter, can make under defrost completely situation, does not improve the temperature of refrigerator inside as far as possible.Described 4th preset duration and described second preset duration are and set in advance, and can set according to actual conditions in practical application, the embodiment of the present invention does not limit this.

Optionally, if described condition of work comprises described environment temperature, the temperature in described accumulative enabling duration and described direct cooling refrigerator.Described first preset rules is: environment temperature is less than default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to first preset between inside temperature thresholds; Described second preset rules is: described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described first preset between inside temperature thresholds; Or, described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to second preset between inside temperature thresholds; Or, described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described second preset between inside temperature thresholds.

Now, if the condition of work of described direct cooling refrigerator meets the first preset rules, do not open described heater, be when described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to first preset between inside temperature thresholds time, do not open described heater; If the condition of work of described direct cooling refrigerator meets the second preset rules, control described heater and open different duration, be when described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described first preset between inside temperature thresholds time, control described heater continue open described 3rd preset duration; When described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to second preset between inside temperature thresholds time, control described heater continue open described 3rd preset duration; When described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described second preset between inside temperature thresholds time, control described heater continue open described second preset duration.

Example, when environment temperature is less than described default environment temperature threshold value, and when in described first preset duration, the accumulative enabling duration of described refrigerator is less than described first preset duration threshold value, the steam that may enter in refrigerator is less, frosting degree on refrigerator inwall is less, if but the temperature in refrigerator is higher, steam free in refrigerator is not easy frosting on inwall, makes the frosting degree on refrigerator inwall less; If when the temperature in refrigerator compartment is lower, steam free in refrigerator is easy to frosting on inwall, may the frosting degree on refrigerator inwall still can be made more like this, but frosting degree is at this moment fewer compared with the frosting degree of refrigerator inwall time little compared with high and accumulative enabling duration than environment temperature, therefore can heater time of opening unsuitable long.Therefore when environment temperature is less than described default environment temperature threshold value, and when in described first preset duration, the accumulative enabling duration of described refrigerator is less than described first preset duration threshold value, the temperature also needing to judge in described refrigerator whether be more than or equal to first preset between inside temperature thresholds, and when the temperature in described refrigerator be more than or equal to described first preset between inside temperature thresholds time, do not open described heater; When the temperature in described refrigerator be less than described first preset between inside temperature thresholds time, control heater open the 3rd preset duration.So, avoid when frosting degree is less on inwall, carry out the waste of the electric energy that defrosting operation causes; When avoiding that on inwall, frosting degree is more, refrigerator does not carry out defrosting operation, the problem significantly reduced of the Energy Efficiency Ratio of the evaporimeter caused simultaneously.

Example, when environment temperature is less than described default environment temperature threshold value, and when in described first preset duration, the accumulative enabling duration of described refrigerator is more than or equal to described first preset duration threshold value, because refrigerator doors is usually opened, following the air steam that may enter in refrigerator understands many, frosting degree may be made more, if but the temperature in refrigerator is higher, steam free in refrigerator is not easy frosting on inwall, make the frosting degree on refrigerator inwall can not be many especially, therefore heater time of opening be unsuitable long; If when the temperature in refrigerator compartment is lower, steam free in refrigerator is easy to frosting on inwall, may the frosting degree on refrigerator inwall still can be made many especially like this, many with the frosting degree when ice the temperature inside the box height, therefore heater time of opening be unsuitable too short.Therefore when environment temperature is less than described default environment temperature threshold value, and when in described first preset duration, the accumulative enabling duration of described refrigerator is more than or equal to described first preset duration threshold value, the temperature also needing to judge in described refrigerator whether be more than or equal to second preset between inside temperature thresholds, and when the temperature in described refrigerator be more than or equal to described second preset between inside temperature thresholds time, control heater open the 3rd preset duration; When the temperature in described refrigerator be less than described first preset between inside temperature thresholds time, control heater opens the second preset duration.So, avoid when frosting degree on inwall is not many especially, carry out the waste of the electric energy that defrosting operation causes; When avoiding that on inwall, frosting degree is many especially, refrigerator does not carry out defrosting operation, the problem significantly reduced of the Energy Efficiency Ratio of the evaporimeter caused simultaneously.

Optionally, if described condition of work comprises described environment temperature, the temperature in described accumulative enabling duration and described direct cooling refrigerator.Described second preset rules is: described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to the 3rd preset between inside temperature thresholds; Or, described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value, and the temperature in described direct cooling refrigerator be less than the described 3rd preset between inside temperature thresholds.

If now the condition of work of described direct cooling refrigerator meets the second preset rules, control described heater and open different duration, be when described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to the 3rd preset between inside temperature thresholds time, control described heater continue open described 3rd preset duration; When described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value, and the temperature in described direct cooling refrigerator be less than the described 3rd preset between inside temperature thresholds time, control described heater continue open described second preset duration.Described 3rd preset duration is less than the second preset duration.

Example, when environment temperature is more than or equal to described default environment temperature threshold value, and when in described first preset duration, the accumulative enabling duration of described refrigerator is less than described second preset duration threshold value, because refrigerator open is less, so the steam that may enter in refrigerator is less, but frosting degree also can be subject to the impact of ice the temperature inside the box.Such as, if the temperature in refrigerator compartment is higher, steam free in refrigerator is not easy frosting on inwall, causes the frosting degree on refrigerator inwall can not be many especially, and therefore heater time of opening is unsuitable long; If when the temperature in refrigerator compartment is lower, steam free in refrigerator is easy to frosting on inwall, may the frosting degree on refrigerator inwall still can be made many especially like this, and the time that therefore heater is opened should not be too short.Therefore, when environment temperature is more than or equal to described default environment temperature threshold value, and when in described first preset duration, the accumulative enabling duration of described refrigerator is less than described second preset duration threshold value, the temperature also needing to judge in described refrigerator whether be more than or equal to the 3rd preset between inside temperature thresholds, and when the temperature in described refrigerator be more than or equal to the described 3rd preset between inside temperature thresholds time, open described heater and continue described 3rd preset duration; When the temperature in described refrigerator be less than the described 3rd preset between inside temperature thresholds time, open described heater and continue described 4th preset duration.So, when the frosting degree of refrigerator inwall is not many especially, make heater open the short period, when the frosting degree of refrigerator inwall is many especially, make heater open the long period.

Optionally, if described condition of work comprises described environment temperature, the temperature in described accumulative enabling duration and described direct cooling refrigerator.Described second preset rules is: environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to the second preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to the 4th preset between inside temperature thresholds; Or, environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value, and the temperature in described direct cooling refrigerator be less than the described 4th preset between inside temperature thresholds.

Now, if the condition of work of described direct cooling refrigerator meets the second preset rules, control described heater and open different duration, be when described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to the 4th preset between inside temperature thresholds time, control described heater continue open described second preset duration; When described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value, and the temperature in described direct cooling refrigerator be less than the described 4th preset between inside temperature thresholds time, control described heater continue open described 4th preset duration.

Example, when environment temperature is more than or equal to described default environment temperature threshold value, and when in described first preset duration, the accumulative enabling duration of described refrigerator is more than or equal to described second preset duration threshold value, follow air enter steam in refrigerator may be more, make the frosting degree of refrigerator inwall more, but frosting degree still can be subject to the impact of ice the temperature inside the box.Such as, if now ice the temperature inside the box is lower, these hydrophones can condense in rapidly on refrigerator inwall, form frosting, cause the frosting degree of refrigerator inwall comparatively serious, now need the time of heater longer; If the temperature in refrigerator is higher, these steam may be free in refrigerator, can't directly frosting on refrigerator inwall, cause the frosting degree of refrigerator inwall not to be especially severe, and now the time of heater is unsuitable long.Therefore when in described first preset duration, the accumulative enabling duration of described refrigerator is more than or equal to described second preset duration threshold value, the temperature also needing to judge in described refrigerator whether be less than the 4th preset between inside temperature thresholds, and when the temperature in described refrigerator be less than the described 4th preset between inside temperature thresholds time, open described heater and continue described 4th preset duration; When the temperature in described refrigerator be more than or equal to the described 4th preset between inside temperature thresholds time, open described heater and continue described second preset duration.So, when the frosting degree of refrigerator inwall is comparatively serious, make heater open the long period, when the frosting degree of refrigerator inwall is not especially severe, make heater open the short period.

It should be noted that, the first, in practical application, the first preset rules and the second preset rules can also be the rule of accumulative enabling duration demand fulfillment, and namely when accumulative enabling duration is longer, control heater opens different duration; When accumulative enabling duration is shorter, not heater; Or the first preset rules and the second preset rules can also for meeting on the basis of rule at accumulative enabling duration, the rule of environment temperature and/or ice the temperature inside the box demand fulfillment; Or the first preset rules and the second preset rules can also be the rule of ice the temperature inside the box demand fulfillment, and namely when ice the temperature inside the box is lower, control heater opens different duration; When ice the temperature inside the box is higher, not heater; Or the first preset rules and the second preset rules can also for meeting on the basis of rule at ice the temperature inside the box, the rule of environment temperature and/or accumulative enabling duration demand fulfillment.Concrete Solution An embodiment does not describe in detail again.

The second, preset environment temperature threshold value in the embodiment of the present invention to pre-set, can set as the case may be in practical application, the embodiment of the present invention does not limit this; In the embodiment of the present invention, the first preset duration threshold value and the second preset duration threshold value are and pre-set, both are the preset duration threshold value described in the embodiment of the present invention, wherein the first preset duration threshold value can be identical with the second preset duration threshold value, also can be different, can set two duration threshold values as the case may be in practical application, the embodiment of the present invention does not limit this.In the embodiment of the present invention first preset between inside temperature thresholds, second preset between inside temperature thresholds, the 3rd preset between inside temperature thresholds and four preset between inside temperature thresholds be and pre-set, four be described in the embodiment of the present invention preset between inside temperature thresholds, wherein four preset between inside temperature thresholds can there is same threshold, also can not exist, can set as the case may be in practical application four preset between inside temperature thresholds, the embodiment of the present invention does not limit this.

Optionally, as shown in Figure 1, described heater 10 comprises metal guide hot plate 101, bottom aluminium foil 102, upper strata aluminium foil 103 and heater strip 104.

Described heater strip 104 is arranged between described bottom aluminium foil 102 and described upper strata aluminium foil 103.Example, heater strip 104 can be evenly arranged between bottom aluminium foil 102 and upper strata aluminium foil 103.Described bottom aluminium foil 102 is close to the one side of described metal guide hot plate 101, the another side of described metal guide hot plate 101 and the inwall 101 of described direct cooling refrigerator are close to, or as shown in Figure 2, the another side of described metal guide hot plate 101 and the evaporimeter 102 of described direct cooling refrigerator are close to.

Concrete, by the metal guide hot plate 101 being arranged at bottom aluminium foil 102 and being close to, the temperature of heater strip can be conducted faster, avoid the situation that local temperature that the temperature conduction due to heater strip causes more slowly is too high, temperature simultaneously owing to conducting heater strip faster, make the speed of defrost, when heater strip opens the same time, make the better effects if of defrost.

Example, described heater 10 can be arranged on the evaporimeter of direct cooling refrigerator, or is arranged on the lower inwall of direct cooling refrigerator, or on the inwall of side.

The embodiment of the present invention provides a kind of Defrost method of direct cooling refrigerator, when the time of described direct cooling refrigerator work is more than or equal to the first preset duration, if the condition of work of described direct cooling refrigerator meets the first preset rules, does not open described heater; If the condition of work of described direct cooling refrigerator meets the second preset rules, control described heater and open different duration, control described heater and open different duration, described condition of work comprises the temperature in environment temperature and/or accumulative enabling duration and/or direct cooling refrigerator.Compared to prior art, because described first preset rules is that the environment temperature that described direct cooling refrigerator carries out work is less than default environment temperature threshold value, and/or the accumulative enabling duration of described direct cooling refrigerator is when being less than preset duration threshold value, and/or the temperature in described direct cooling refrigerator be more than or equal to preset between inside temperature thresholds, described second preset rules is that the environment temperature that described direct cooling refrigerator carries out work is more than or equal to default environment temperature threshold value, and/or the accumulative enabling duration of described direct cooling refrigerator is when being more than or equal to preset duration threshold value, and/or the temperature in described direct cooling refrigerator be less than preset between inside temperature thresholds, so the embodiment of the present invention can meet the first preset rules or the second preset rules according to direct cooling refrigerator condition of work, know described direct cooling refrigerator by inference the need of carrying out defrost, namely the number of the frosting degree of inwall after work first preset duration of direct cooling refrigerator is known by inference, and then the number of frosting degree according to cold refrigerator inwall, not heater or control heater is selected to open different duration, namely when frosting degree on direct cooling refrigerator inwall is little, when not needing to carry out defrost, not heater, save electric energy, when on direct cooling refrigerator inwall, frosting degree is less, when needed for refrigerator, the defrost time is shorter, it is long when control heater is opened shorter, the post-heater that defrost is completed can not work on, and then direct cooling refrigerator internal temperature can not be caused to rise, avoiding compressor opens when carrying out work again, needs to use more electric energy to reduce the temperature of refrigerator inside, has saved electric energy, when on direct cooling refrigerator inwall, frosting degree is more, when needed for refrigerator, the defrost time is longer, control heater opens longer duration, makes direct cooling refrigerator can fully defrost, and the remaining frost after minimizing defrost on direct cooling refrigerator inwall, improves defrost effect.

The embodiment of the present invention provides a kind of Defrost method of direct cooling refrigerator, and as shown in Figure 3, described direct cooling refrigerator comprises heater, and described method comprises:

Step 301, direct cooling refrigerator are started working.Perform step 302.

Because direct-cooling type direct cooling refrigerator is in the process of work, evaporimeter reduces the temperature of direct cooling refrigerator inwall, then exchange heat is carried out by temperature indoor between the inwall of direct cooling refrigerator and direct cooling refrigerator, the temperature of direct cooling refrigerator inwall can be caused so lower, and the steam entering direct cooling refrigerator can condense into frost when running into colder direct cooling refrigerator inwall.Therefore need to judge that direct cooling refrigerator is the need of defrosting at set intervals, if need to defrost, heater needs how long to open.

Step 302, when the time of described direct cooling refrigerator work is more than or equal to the first preset duration, judge whether environment temperature is more than or equal to default environment temperature threshold value; When environment temperature is less than described default environment temperature threshold value, perform step 303; When environment temperature is more than or equal to described default environment temperature threshold value, perform step 306.

When the time of described direct cooling refrigerator work is more than or equal to the first preset duration, illustrate that direct cooling refrigerator has run the long period, may need to carry out defrosting operation.If but when environment temperature is higher, air humidity is comparatively large, and the steam entered in direct cooling refrigerator is more, and after direct cooling refrigerator has run the first preset duration, the frosting degree on direct cooling refrigerator inwall is more, needs to carry out defrosting operation; When environment temperature is lower, air humidity is less, and the steam entered in direct cooling refrigerator is less, even if direct cooling refrigerator has run the first preset duration, but the frosting degree on direct cooling refrigerator inwall is less, not needing to carry out defrosting operation or heater only needs to open the short period and can complete defrost.Therefore, when the time of described direct cooling refrigerator work is more than or equal to the first preset duration, need to judge whether environment temperature is more than or equal to default environment temperature threshold value.Pre-set during the first preset duration, can be identical with the preset duration that direct cooling refrigerator in prior art runs, also can set as the case may be in actual applications, the embodiment of the present invention does not limit this.Pre-set during described default environment temperature threshold value, can set as the case may be in practical application, the embodiment of the present invention does not limit this.

Step 303, judge in the first preset duration, whether the accumulative enabling duration of described direct cooling refrigerator is more than or equal to the first preset duration threshold value, when the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value in described first preset duration, perform step 304; When the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value in described first preset duration, perform step 305.

When environment temperature is less than described default environment temperature threshold value, humidity in air is lower, the steam entered in direct cooling refrigerator is less, if but in the first preset duration of direct cooling refrigerator continuous service, the door of direct cooling refrigerator opens for a long time, steam in air continually can enter direct cooling refrigerator inside, too many steam enters direct cooling refrigerator inside, direct cooling refrigerator internal steam is filled, these steam are frosting on direct cooling refrigerator inwall easily, the frosting degree on direct cooling refrigerator inwall can be made more, therefore when environment temperature is less than described default environment temperature threshold value, also need to judge in the first preset duration, whether the accumulative enabling duration of direct cooling refrigerator is less than the first preset duration threshold value, described accumulative enabling duration is the cumulative sum of the time continued that direct cooling refrigerator opens the door at every turn.

Step 304, the temperature judged in described direct cooling refrigerator whether be less than second preset between inside temperature thresholds, when the temperature in described direct cooling refrigerator be less than described second preset between inside temperature thresholds time, perform step 311; When the temperature in described direct cooling refrigerator be more than or equal to described second preset between inside temperature thresholds time, perform step 310.

When environment temperature is less than described default environment temperature threshold value, and when in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, although humidity is lower in air, steam is less, but because the door of direct cooling refrigerator is usually opened, the moisture in air is made to enter direct cooling refrigerator endlessly, now, if the temperature of direct cooling refrigerator inside is lower, then these steam are easy to after entering direct cooling refrigerator condense on direct cooling refrigerator inwall and form frosting, make the frosting degree of direct cooling refrigerator inwall relatively many; If the temperature of direct cooling refrigerator inside is higher, can not be easy to condense on direct cooling refrigerator inwall after then these steam enter direct cooling refrigerator and form frosting, wherein there is direct cooling refrigerator inside with the form of free steam in some, frosting degree when making the frosting degree of direct cooling refrigerator internal temperature higher direct cooling refrigerator inwall lower relative to direct cooling refrigerator internal temperature is a lot of less, may only need the heater unlatching short period to complete defrost.Although now all want heater to carry out defrosting operation, if the time that heater is opened is the same, when may occur that frosting degree is less, the time that heater is opened is longer; When frosting degree is more, the time that heater is opened is shorter.Therefore, when environment temperature is less than described default environment temperature threshold value, and when in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, the temperature also needing to judge in described direct cooling refrigerator whether be less than second preset between inside temperature thresholds.

Step 305, the temperature judged in described direct cooling refrigerator whether be less than first preset between inside temperature thresholds, when the temperature in described direct cooling refrigerator be less than described first preset between inside temperature thresholds time, perform step 310; When the temperature in described direct cooling refrigerator be more than or equal to described first preset between inside temperature thresholds time, perform step 309.

When environment temperature is less than described default environment temperature threshold value, and when in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value, the steam that may enter in direct cooling refrigerator is less, when but if temperature indoor between direct cooling refrigerator is higher, steam free in direct cooling refrigerator is not easy frosting on inwall, when temperature indoor between direct cooling refrigerator is lower, steam free in direct cooling refrigerator is easy to frosting on inwall, how a lot of frosting degree when the frosting degree on direct cooling refrigerator inwall may still can be made so higher compared to direct cooling refrigerator temperature is.If the time that heater is opened is the same, when may occur that frosting degree is less, the time that heater is opened is longer; When frosting degree is more, the time that heater is opened is shorter.Therefore when environment temperature is less than described default environment temperature threshold value, and when in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value, the temperature also needing to judge in described direct cooling refrigerator whether be more than or equal to first preset between inside temperature thresholds.

Step 306, judge in the first preset duration, whether the accumulative enabling duration of described direct cooling refrigerator is more than or equal to the second preset duration threshold value, when the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value in described first preset duration, perform step 307; When the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value in described first preset duration, perform step 308.

When environment temperature is more than or equal to described default environment temperature threshold value, because in air, humidity is higher, the frosting degree therefore on direct cooling refrigerator inwall may be more, but in the first preset duration, the accumulative enabling duration of direct cooling refrigerator is different, and frosting degree can be caused to have difference.Such as, when environment temperature is more than or equal to described default environment temperature threshold value, if the door of direct cooling refrigerator opens for a long time, the steam in air continually can enter direct cooling refrigerator inside, makes the frosting degree on inwall relatively many; If the door of direct cooling refrigerator is closed for a long time, then it is less to follow the steam that air enters in direct cooling refrigerator, makes the frosting degree on inwall relatively less.If the time that heater is opened is the same, when may occur that frosting degree is less, the time that heater is opened is longer; When frosting degree is more, the time that heater is opened is shorter.Therefore, when being more than or equal to described default environment temperature threshold value when environment temperature, also need to judge in the first preset duration, whether the accumulative enabling duration of described direct cooling refrigerator is more than or equal to the second preset duration threshold value.

Step 307, the temperature judged in described direct cooling refrigerator whether be less than the 4th preset between inside temperature thresholds, when the temperature in described direct cooling refrigerator be less than the described 4th preset between inside temperature thresholds time, perform step 312; When the temperature in described direct cooling refrigerator be more than or equal to the described 4th preset between inside temperature thresholds time, perform step 311.

When environment temperature is more than or equal to described default environment temperature threshold value, and when in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value, follow air enter steam in direct cooling refrigerator may be more, if now in direct cooling refrigerator, temperature is lower, these hydrophones can condense in rapidly on direct cooling refrigerator inwall, form frosting, cause the frosting degree of direct cooling refrigerator inwall relatively many, if but the temperature in direct cooling refrigerator is higher, these steam may be free in direct cooling refrigerator, can't frosting on direct cooling refrigerator inwall, cause the frosting degree of direct cooling refrigerator inwall relatively less.If the time that heater is opened is the same, when may occur that frosting degree is less, the time that heater is opened is longer; When frosting degree is more, the time that heater is opened is shorter.Therefore when environment temperature is more than or equal to described default environment temperature threshold value, and when in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value, the temperature also needing to judge in described direct cooling refrigerator whether be less than the 4th preset between inside temperature thresholds.

Step 308, the temperature judged in described direct cooling refrigerator whether be less than the 3rd preset between inside temperature thresholds, when the temperature in described direct cooling refrigerator be less than the described 3rd preset between inside temperature thresholds time, perform step 311; When the temperature in described direct cooling refrigerator be more than or equal to the described 3rd preset between inside temperature thresholds time, perform step 310.

When environment temperature is greater than described default environment temperature threshold value, and when in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value, because direct cooling refrigerator opens the door less, so the steam that may enter in direct cooling refrigerator is less, if the temperature in direct cooling refrigerator is higher, these steam may be free in direct cooling refrigerator, are not easy frosting on direct cooling refrigerator inwall, and frosting degree is relatively less; If but temperature is lower in direct cooling refrigerator, these hydrophones can condense in rapidly on direct cooling refrigerator inwall, form frosting, the frosting degree of direct cooling refrigerator inwall still can be caused relatively many.If the time that heater is opened is the same, when may occur that frosting degree is less, the time that heater is opened is longer; When frosting degree is more, the time that heater is opened is shorter.Therefore the temperature also needing to judge in described direct cooling refrigerator whether be more than or equal to the 3rd preset between inside temperature thresholds.

Step 309, not heater.

When environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to described first preset between inside temperature thresholds time, now in air, humidity is lower, direct cooling refrigerator Men Changguan, and temperature is higher in direct cooling refrigerator, can determine that on direct cooling refrigerator inwall, frosting degree is little, the efficiency of evaporimeter can not be affected, almost can not consider, therefore can not heater.

Step 310, heater continue the 3rd preset duration.

When environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described first preset between inside temperature thresholds time, although now air humidity is less, direct cooling refrigerator Men Changguan, but temperature is lower in direct cooling refrigerator, the favourable steam in direct cooling refrigerator inside is made to be easy to form frosting at direct cooling refrigerator condensed on inner walls, so direct cooling refrigerator inwall still has less frosting degree, but do not need the overlong time of being opened by heater, therefore heater continues the 3rd preset duration.

Or, when environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to described second preset between inside temperature thresholds time, although now in air, humidity is lower, and temperature is higher in direct cooling refrigerator, but because direct cooling refrigerator door is usually opened, the moisture in air is made to enter direct cooling refrigerator endlessly, full steam can make that direct cooling refrigerator inwall still exists less frosting degree, but do not need the overlong time of being opened by heater, therefore heater continues the 3rd preset duration.

Or, when environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to the described 3rd preset between inside temperature thresholds time, although now in air, humidity is larger, but due to direct cooling refrigerator Men Changguan, and temperature is higher in direct cooling refrigerator, make the frosting degree on direct cooling refrigerator inwall less, the overlong time of being opened by heater is not needed when carrying out defrost, therefore heater continues the 3rd preset duration.

Step 311, heater continue the second preset duration.

When environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described second preset between inside temperature thresholds time, although now water in air vapour is less, but due to direct cooling refrigerator Men Changkai, and temperature is lower in direct cooling refrigerator, steam easily condenses on inwall and forms frosting, therefore the frosting degree on direct cooling refrigerator inwall is appropriate, and heater continues the second preset duration.

Or, when environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described first preset between inside temperature thresholds time, although now in air, humidity is larger, and the temperature in direct cooling refrigerator is lower, upper easy frosting on direct cooling refrigerator inwall, but direct cooling refrigerator Men Changguan, steam is not easy to enter direct cooling refrigerator, therefore the frosting degree on direct cooling refrigerator inwall is appropriate, heater continues the second preset duration.

Or, when environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to the described 4th preset between inside temperature thresholds time, now, although humidity is larger in air, and direct cooling refrigerator Men Changkai, but temperature is higher in direct cooling refrigerator, therefore the frosting degree on direct cooling refrigerator inwall is appropriate, and heater continues the second preset duration.

Step 312, heater continue the 4th preset duration.

When environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value, and the temperature in described direct cooling refrigerator be less than the described 4th preset between inside temperature thresholds time, now in air, humidity is larger, direct cooling refrigerator Men Changkai, and temperature is lower in direct cooling refrigerator, the frosting degree therefore on direct cooling refrigerator inwall is more, and therefore heater continues the 4th preset duration.

It should be noted that, preset environment temperature threshold value in the embodiment of the present invention and pre-set, can set as the case may be in practical application, the embodiment of the present invention does not limit this; In the embodiment of the present invention, the first preset duration threshold value and the second preset duration threshold value are and pre-set, wherein the first preset duration threshold value can be identical with the second preset duration threshold value, also can be different, can set two duration threshold values as the case may be in practical application, the embodiment of the present invention does not limit this.In the embodiment of the present invention first preset between inside temperature thresholds, second preset between inside temperature thresholds, the 3rd preset between inside temperature thresholds and four preset between inside temperature thresholds be and pre-set, wherein four preset between inside temperature thresholds can be identical, also can be different, can set as the case may be in practical application four preset between inside temperature thresholds, the embodiment of the present invention does not limit this.In the embodiment of the present invention, the second preset duration, the 3rd preset duration and the 4th preset duration preset, wherein the 3rd preset duration is less than the 4th preset duration, 4th preset duration is less than the second preset duration, can set three preset duration as the case may be in practical application, the embodiment of the present invention does not limit this.

The embodiment of the present invention provides a kind of direct cooling refrigerator 40, and as shown in Figure 4, described direct cooling refrigerator 40 comprises:

Heater 10, described heater is used for heating, and described direct cooling refrigerator inner wall temperature is raised.

Shown in figure 1 and Fig. 2, described heater 10 comprises metal guide hot plate 101, bottom aluminium foil 102, upper strata aluminium foil 103 and heater strip 104.Described heater strip 104 is arranged between described bottom aluminium foil 102 and described upper strata aluminium foil 103.Example, heater strip 104 can be evenly arranged between bottom aluminium foil 102 and upper strata aluminium foil 103.Described bottom aluminium foil 102 is close to the one side of described metal guide hot plate 101, and the another side of described metal guide hot plate 101 and the inwall 101 of described direct cooling refrigerator are close to, or the another side of described metal guide hot plate 101 and the evaporimeter 102 of described direct cooling refrigerator are close to.

Control unit 401, described control unit is used for when the time of described direct cooling refrigerator work is more than or equal to the first preset duration, if the condition of work of described direct cooling refrigerator meets the first preset rules, does not open described heater; If the condition of work of described direct cooling refrigerator meets the second preset rules, control described heater and open different duration;

After direct cooling refrigerator work first preset duration, refrigerator inwall have accumulated certain frosting degree, may need to carry out defrost, but the frosting degree of refrigerator inwall is different under different operating condition, likely frosting degree is less, does not need to carry out defrost, is also likely that on refrigerator inwall, frosting degree is more simultaneously, need long-time heater, ensure that defrost is complete.Therefore, after direct cooling refrigerator work first preset duration, control unit 401 can detect the condition of work of refrigerator, according to different conditions of work, the frosting degree of knowing by inference number, then according to how many selections of frosting degree of knowing by inference not heater or open different duration.

So, when on direct cooling refrigerator inwall, frosting degree is less, control unit can not heater or open the short period, the post-heater that defrost is completed can not work on, and direct cooling refrigerator internal temperature can not be caused to rise, saved electric energy; When on direct cooling refrigerator inwall, frosting degree is more, control unit can the heater long period, makes heater can fully defrost, reduces the remaining frost on direct cooling refrigerator inwall after defrost, improves defrost effect.

Example, described condition of work comprises described environment temperature.Described first preset rules is that environment temperature is less than default environment temperature threshold value; Described second preset rules is that environment temperature is more than or equal to described default environment temperature threshold value.Described control unit 401 specifically for: when described environment temperature is less than default environment temperature threshold value, do not open described heater; When environment temperature is more than or equal to described default environment temperature threshold value, controls described heater and continue unlatching second preset duration.

Example, described condition of work comprises described environment temperature and described accumulative enabling duration.Described first preset rules is: environment temperature is less than default environment temperature threshold value, and in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than the first preset duration threshold value; Described second preset rules is: environment temperature is less than described default environment temperature threshold value, and in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value; Or environment temperature is more than or equal to described default environment temperature threshold value, and in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value; Or environment temperature is more than or equal to described default environment temperature threshold value, and in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value.

Described control unit 401 specifically for: when described environment temperature is less than described default environment temperature threshold value, and when the accumulative enabling duration of described direct cooling refrigerator is less than the first preset duration threshold value in described first preset duration, do not open described heater; When described environment temperature is more than or equal to described default environment temperature threshold value, with when the accumulative enabling duration of described direct cooling refrigerator is less than the second preset duration threshold value in described first preset duration, control described heater and continue unlatching second preset duration; When described environment temperature is more than or equal to described default environment temperature threshold value, with when the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value in described first preset duration, controls described heater and continue to open described 4th preset duration; Described 3rd preset duration is less than the second preset duration, and described second preset duration is less than described 4th preset duration.

Example, described condition of work comprises described environment temperature and described accumulative enabling duration.Described first preset rules is: environment temperature is less than default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than the first preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to first preset between inside temperature thresholds; Described second preset rules is: described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described first preset between inside temperature thresholds; Or, described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to second preset between inside temperature thresholds; Or, described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described second preset between inside temperature thresholds.

Described control unit 401 specifically for: when described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to first preset between inside temperature thresholds time, do not open described heater; When described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described first preset between inside temperature thresholds time, control described heater and continue unlatching the 3rd preset duration; When described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to second preset between inside temperature thresholds time, control described heater continue open described 3rd preset duration; When described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described second preset between inside temperature thresholds time, control described heater and continue unlatching second preset duration; Described 3rd preset duration is less than the second preset duration.

Example, described condition of work comprises described environment temperature, the temperature in described accumulative enabling duration and described direct cooling refrigerator.Described second preset rules is: described environment temperature is more than or equal to default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than the second preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to the 3rd preset between inside temperature thresholds; Or, described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value, and the temperature in described direct cooling refrigerator be less than the described 3rd preset between inside temperature thresholds.

Described control unit 401 specifically for: when described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to the 3rd preset between inside temperature thresholds time, control described heater and continue unlatching the 3rd preset duration; When described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value, and the temperature in described direct cooling refrigerator be less than the described 3rd preset between inside temperature thresholds time, control described heater and continue unlatching second preset duration; Described 3rd preset duration is less than the second preset duration.

Example, described condition of work comprises described environment temperature, the temperature in described accumulative enabling duration and described direct cooling refrigerator.Described second preset rules is: environment temperature is more than or equal to default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to the second preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to the 4th preset between inside temperature thresholds; Or, environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value, and the temperature in described direct cooling refrigerator be less than the described 4th preset between inside temperature thresholds.

Described control unit 401 specifically for: when described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to the 4th preset between inside temperature thresholds time, control described heater and continue unlatching second preset duration; When described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value, and the temperature in described direct cooling refrigerator be less than the described 4th preset between inside temperature thresholds time, control described heater and continue unlatching the 4th preset duration; Described second preset duration is less than described 4th preset duration.

Example, described heater comprises metal guide hot plate, bottom aluminium foil, upper strata aluminium foil and heater strip; Described heater strip is arranged between described bottom aluminium foil and described upper strata aluminium foil; Described bottom aluminium foil is close to the one side of described metal guide hot plate, and the evaporimeter of the another side of described metal guide hot plate and the inwall of described direct cooling refrigerator or described direct cooling refrigerator is close to.

The direct cooling refrigerator that the embodiment of the present invention provides, described direct cooling refrigerator comprises heater and control unit, control unit is used for when the time of described direct cooling refrigerator work is more than or equal to the first preset duration, if the condition of work of described direct cooling refrigerator meets the first preset rules, do not open described heater; If the condition of work of described direct cooling refrigerator meets the second preset rules, control described heater and open different duration, control described heater and open different duration, described condition of work comprises the temperature in environment temperature and/or accumulative enabling duration and/or direct cooling refrigerator.Compared to prior art, because described first preset rules is that the environment temperature that described direct cooling refrigerator carries out work is less than default environment temperature threshold value, and/or the accumulative enabling duration of described direct cooling refrigerator is when being less than preset duration threshold value, and/or the temperature in described direct cooling refrigerator be more than or equal to preset between inside temperature thresholds, described second preset rules is that the environment temperature that described direct cooling refrigerator carries out work is more than or equal to default environment temperature threshold value, and/or the accumulative enabling duration of described direct cooling refrigerator is when being more than or equal to preset duration threshold value, and/or the temperature in described direct cooling refrigerator be less than preset between inside temperature thresholds, so the embodiment of the present invention can meet the first preset rules or the second preset rules according to direct cooling refrigerator condition of work, know described direct cooling refrigerator by inference the need of carrying out defrost, namely the number of the frosting degree of inwall after work first preset duration of direct cooling refrigerator is known by inference, and then the number of frosting degree according to cold refrigerator inwall, not heater or control heater is selected to open different duration, namely when frosting degree on direct cooling refrigerator inwall is little, when not needing to carry out defrost, not heater, save electric energy, when on direct cooling refrigerator inwall, frosting degree is less, when needed for refrigerator, the defrost time is shorter, it is long when control heater is opened shorter, the post-heater that defrost is completed can not work on, and then direct cooling refrigerator internal temperature can not be caused to rise, avoiding compressor opens when carrying out work again, needs to use more electric energy to reduce the temperature of refrigerator inside, has saved electric energy, when on direct cooling refrigerator inwall, frosting degree is more, when needed for refrigerator, the defrost time is longer, control heater opens longer duration, makes direct cooling refrigerator can fully defrost, and the remaining frost after minimizing defrost on direct cooling refrigerator inwall, improves defrost effect.

Those skilled in the art can be well understood to, and for convenience and simplicity of description, the device of foregoing description and the specific works process of unit, with reference to the corresponding process in preceding method embodiment, can not repeat them here.

In several embodiments that the application provides, should be understood that disclosed direct cooling refrigerator and Defrost method can realize by another way.Such as, the embodiment of direct cooling refrigerator described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.

The described parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed on multiple NE.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.

In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit comprises, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form that hardware also can be adopted to add SFU software functional unit realizes.

The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.

Claims

1. a Defrost method for direct cooling refrigerator, is characterized in that, described direct cooling refrigerator comprises heater, and described method comprises:

When the time of described direct cooling refrigerator work is more than or equal to the first preset duration,

If the condition of work of described direct cooling refrigerator meets the first preset rules, do not open described heater;

If the condition of work of described direct cooling refrigerator meets the second preset rules, control described heater and open different duration;

2. Defrost method according to claim 1, is characterized in that, described condition of work comprises described environment temperature;

Described first preset rules is that environment temperature is less than default environment temperature threshold value;

Described second preset rules is that environment temperature is more than or equal to described default environment temperature threshold value;

If the condition of work of described direct cooling refrigerator meets the first preset rules, do not open described heater and comprise:

When environment temperature is less than described default environment temperature threshold value, do not open described heater;

If the condition of work of described direct cooling refrigerator meets the second preset rules, control described heater and open different duration and comprise:

When environment temperature is more than or equal to described default environment temperature threshold value, controls described heater and continue unlatching second preset duration.

3. Defrost method according to claim 1, is characterized in that, described condition of work comprises described environment temperature and described accumulative enabling duration;

Described first preset rules is:

Environment temperature is less than default environment temperature threshold value, and in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than the first preset duration threshold value;

Described second preset rules is:

Environment temperature is less than described default environment temperature threshold value, and in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value;

Or environment temperature is more than or equal to described default environment temperature threshold value, and in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than the second preset duration threshold value;

Or environment temperature is more than or equal to described default environment temperature threshold value, and in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value;

When described environment temperature is less than described default environment temperature threshold value, and when the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value in described first preset duration, do not open described heater;

When described environment temperature is less than described default environment temperature threshold value, with when the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value in described first preset duration, control described heater and continue unlatching the 3rd preset duration;

When described environment temperature is more than or equal to described default environment temperature threshold value, with when the accumulative enabling duration of described direct cooling refrigerator is less than the second preset duration threshold value in described first preset duration, control described heater and continue unlatching second preset duration;

When described environment temperature is more than or equal to described default environment temperature threshold value, with when the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value in described first preset duration, controls described heater and continue to open described 4th preset duration;

Described 3rd preset duration is less than the second preset duration, and described second preset duration is less than described 4th preset duration.

4. Defrost method according to claim 1, is characterized in that, described condition of work comprises described environment temperature, the temperature in described accumulative enabling duration and described direct cooling refrigerator;

Described first preset rules is:

Environment temperature is less than default environment temperature threshold value, and in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than the first preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to first preset between inside temperature thresholds;

Described second preset rules is:

Described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described first preset between inside temperature thresholds;

Or, described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to second preset between inside temperature thresholds;

Or, described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described second preset between inside temperature thresholds;

When described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to first preset between inside temperature thresholds time, do not open described heater;

When described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described first preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described first preset between inside temperature thresholds time, control described heater and continue unlatching the 3rd preset duration;

When described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to second preset between inside temperature thresholds time, control described heater continue open described 3rd preset duration;

When described environment temperature is less than described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described first preset duration threshold value, and the temperature in described direct cooling refrigerator be less than described second preset between inside temperature thresholds time, control described heater and continue unlatching second preset duration;

Described 3rd preset duration is less than the second preset duration.

5. Defrost method according to claim 1, is characterized in that, described condition of work comprises described environment temperature, the temperature in described accumulative enabling duration and described direct cooling refrigerator;

Described second preset rules is:

Described environment temperature is more than or equal to default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than the second preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to the 3rd preset between inside temperature thresholds;

Or, described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value, and the temperature in described direct cooling refrigerator be less than the described 3rd preset between inside temperature thresholds;

When described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to the 3rd preset between inside temperature thresholds time, control described heater and continue unlatching the 3rd preset duration;

When described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value, and the temperature in described direct cooling refrigerator be less than the described 3rd preset between inside temperature thresholds time, control described heater and continue unlatching second preset duration;

Described 3rd preset duration is less than the second preset duration.

6. Defrost method according to claim 1, is characterized in that, described condition of work comprises described environment temperature, the temperature in described accumulative enabling duration and described direct cooling refrigerator;

Described second preset rules is:

Environment temperature is more than or equal to default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to the second preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to the 4th preset between inside temperature thresholds;

Or, environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value, and the temperature in described direct cooling refrigerator be less than the described 4th preset between inside temperature thresholds;

When described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value, and the temperature in described direct cooling refrigerator be more than or equal to the 4th preset between inside temperature thresholds time, control described heater and continue unlatching second preset duration;

When described environment temperature is more than or equal to described default environment temperature threshold value, in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is more than or equal to described second preset duration threshold value, and the temperature in described direct cooling refrigerator be less than the described 4th preset between inside temperature thresholds time, control described heater and continue unlatching the 4th preset duration;

Described second preset duration is less than described 4th preset duration.

7. the Defrost method according to claim 1 to 6 any one claim, is characterized in that, described heater comprises metal guide hot plate, bottom aluminium foil, upper strata aluminium foil and heater strip;

Described heater strip is arranged between described bottom aluminium foil and described upper strata aluminium foil; Described bottom aluminium foil is close to the one side of described metal guide hot plate, and the evaporimeter of the another side of described metal guide hot plate and the inwall of described direct cooling refrigerator or described direct cooling refrigerator is close to.

8. a direct cooling refrigerator, is characterized in that, described direct cooling refrigerator comprises:

Heater, described heater is used for heating, and described direct cooling refrigerator inner wall temperature is raised;

Control unit, described control unit is used for when the time of described direct cooling refrigerator work is more than or equal to the first preset duration, if the condition of work of described direct cooling refrigerator meets the first preset rules, does not open described heater; If the condition of work of described direct cooling refrigerator meets the second preset rules, control described heater and open different duration;

9. direct cooling refrigerator according to claim 8, is characterized in that, described condition of work comprises described environment temperature;

Described control unit specifically for:

When described environment temperature is less than default environment temperature threshold value, do not open described heater;

10. direct cooling refrigerator according to claim 8, is characterized in that, described condition of work comprises described environment temperature and described accumulative enabling duration;

Described first preset rules is:

Described second preset rules is:

Or environment temperature is more than or equal to described default environment temperature threshold value, and in described first preset duration, the accumulative enabling duration of described direct cooling refrigerator is less than described second preset duration threshold value;

Described control unit specifically for:

11. direct cooling refrigerators according to claim 8, is characterized in that, described condition of work comprises described environment temperature and described accumulative enabling duration;

Described first preset rules is:

Described second preset rules is:

Described control unit specifically for:

Described 3rd preset duration is less than the second preset duration.

12. direct cooling refrigerators according to claim 8, is characterized in that, described condition of work comprises described environment temperature, the temperature in described accumulative enabling duration and described direct cooling refrigerator;

Described second preset rules is:

Described control unit specifically for:

Described 3rd preset duration is less than the second preset duration.

13. direct cooling refrigerators according to claim 8, is characterized in that, described condition of work comprises described environment temperature, the temperature in described accumulative enabling duration and described direct cooling refrigerator;

Described second preset rules is:

Described control unit specifically for:

Described second preset duration is less than described 4th preset duration.

Direct cooling refrigerator described in 14. according to Claim 8 to 13 any one claims, it is characterized in that, described heater comprises metal guide hot plate, bottom aluminium foil, upper strata aluminium foil and heater strip;