阅读说明：本技术 一种冰箱除湿化霜装置、控制方法和冰箱 (Refrigerator dehumidification and defrosting device, control method and refrigerator ) 是由 卢起彪 陆文怡 朱文琪 邓涵 孟贺 刘绍文 于 2021-01-04 设计创作，主要内容包括：本公开提供一种冰箱除湿化霜装置、控制方法和冰箱,冰箱除湿化霜装置包括：蒸发器、加热装置、辅助风道和辅助风机,所述蒸发器设置于出风风道中,所述辅助风机设置于所述辅助风道内、或设置于所述出风风道和所述辅助风道相接的位置,所述加热装置也设置于所述出风风道内、或设置于所述辅助风道内、或设置于所述出风风道和所述辅助风道相接的位置,所述出风风道的一端能够与所述辅助风道的一端连通,所述蒸发腔的另一端能够与所述辅助风道的另一端连通,使得所述出风风道和所述辅助风道内的气流能够形成内循环。根据本公开能够同时有效解决了冰箱化霜效率低、化霜时间较长、化霜功耗高的问题。(The present disclosure provides a refrigerator dehumidification and defrosting device, a control method and a refrigerator, wherein the refrigerator dehumidification and defrosting device comprises: evaporimeter, heating device, supplementary wind channel and auxiliary fan, the evaporimeter sets up in the air-out wind channel, auxiliary fan set up in the supplementary wind channel, or set up in the air-out wind channel with the position that supplementary wind channel meets, heating device also set up in the air-out wind channel, or set up in the air-out wind channel with the position that supplementary wind channel meets, the one end in air-out wind channel can with the one end intercommunication in supplementary wind channel, the other end in evaporation chamber can with the other end intercommunication in supplementary wind channel makes the air-out wind channel with the air current in the supplementary wind channel can form the inner loop. According to the refrigerator defrosting method and the refrigerator defrosting device, the problems of low defrosting efficiency, long defrosting time and high defrosting power consumption of the refrigerator can be effectively solved at the same time.)

1. A refrigerator dehumidification defrosting device is characterized in that: the method comprises the following steps:

an evaporator (15), a heating device (16), an auxiliary air duct (10) and an auxiliary fan (14), the evaporator (15) is arranged in the air outlet duct (7), the auxiliary fan (14) is arranged in the auxiliary air duct (10) or at the position where the air outlet duct (7) is connected with the auxiliary air duct (10), the heating device (16) is also arranged in the air outlet duct (7), or in the auxiliary air duct (10), or at the position where the air outlet duct (7) is connected with the auxiliary air duct (10), one end of the air outlet duct (7) can be communicated with one end of the auxiliary air duct (10), the other end of the air outlet duct (7) can be communicated with the other end of the auxiliary air duct (10), so that the air flow in the air outlet duct (7) and the auxiliary duct (10) can form internal circulation.

2. The refrigerator dehumidifying and defrosting apparatus of claim 1, wherein:

supplementary wind channel (10) with the position that air-out wind channel (7) meet is provided with supplementary air door (19), through supplementary air door (19) can be opened supplementary wind channel (10), make supplementary wind channel (10) with air-out wind channel (7) intercommunication, through supplementary air door (19) can also be closed supplementary wind channel (10), make supplementary wind channel (10) with air-out wind channel (7) do not communicate.

3. The refrigerator dehumidifying and defrosting apparatus of claim 1 or 2, wherein:

the air outlet duct (7) is arranged in a freezing chamber (3) of the refrigerator, a freezing air outlet (11) is further arranged on the air outlet duct (7), one end of the freezing air outlet (11) is communicated with the inside of the air outlet duct (7), and the other end of the freezing air outlet (11) is communicated with the freezing chamber (3); and/or the presence of a gas in the gas,

and a freezing air return opening (12) is further arranged on the air outlet duct (7), one end of the freezing air return opening (12) is communicated with the inside of the air outlet duct (7), and the other end of the freezing air return opening is communicated with the freezing chamber (3).

4. The refrigerator dehumidifying and defrosting apparatus of claim 3, wherein:

a freezing fan (13) is arranged at the freezing air outlet (11) and/or the freezing air return inlet (12); and/or the presence of a gas in the gas,

the freezing air outlet (11) or the freezing air return opening (12) is further provided with a freezing air door, the freezing air outlet (11) or the freezing air return opening (12) can be opened through the freezing air door, and the freezing air outlet (11) or the freezing air return opening (12) can be closed through the freezing air door.

5. The refrigerator dehumidifying and defrosting apparatus of claim 3, wherein:

the freezing return air duct (9) is positioned in the freezing chamber (3) and communicated with the freezing chamber (3), and meanwhile, the freezing return air duct (9) is also communicated with the freezing return air inlet (12); and/or the presence of a gas in the gas,

the evaporator (15), the heating device (16), the auxiliary air duct (10) and the auxiliary fan (14) are all arranged in the freezing chamber (3).

6. The dehumidifying and defrosting apparatus for a refrigerator according to any one of claims 1 to 5, wherein:

the refrigerator is characterized by further comprising a refrigeration air inlet duct (6), wherein one end of the refrigeration air inlet duct (6) is communicated with the air outlet duct (7), the other end of the refrigeration air inlet duct is communicated with the interior of a refrigerating chamber (2) of the refrigerator, and air in the air outlet duct (7) can enter the refrigerating chamber (2) through the refrigeration air inlet duct (6); and/or the presence of a gas in the gas,

still include cold-stored return air duct (8), cold-stored return air duct (8) one end and the inside intercommunication of the walk-in (2) of refrigerator, the other end with air-out wind channel (7) intercommunication, through cold-stored return air duct (8) can make wind in walk-in (2) air-out wind channel (7).

7. The refrigerator dehumidifying and defrosting apparatus of claim 6, wherein:

refrigeration air inlet duct (6) with air outlet duct (7) department of meeting, or at refrigeration return air duct (8) with air outlet duct (7) department of meeting still is provided with cold-stored air door, through cold-stored air door can open cold-stored air inlet duct (6) or cold-stored return air duct (8), through cold-stored air door can also close cold-stored air inlet duct (6) or close cold-stored return air duct (8).

8. The dehumidifying and defrosting apparatus for a refrigerator according to any one of claims 1 to 7, wherein:

a temperature sensor is arranged on the evaporator (15) and can be used for detecting the temperature T of the evaporator (15); and/or a humidity sensor is arranged inside the auxiliary air duct (10) or inside the air outlet duct (7); and/or the refrigerator dehumidifying and defrosting device further comprises a compressor.

9. The dehumidifying and defrosting apparatus for a refrigerator according to any one of claims 1 to 8, wherein:

the water collecting device is characterized by further comprising a water collecting tray (20) and a drain pipe (21), wherein the water collecting tray (20) can receive condensed water, and the drain pipe (21) is communicated with the water collecting tray (20).

10. A control method of a dehumidifying and defrosting apparatus for a refrigerator according to any one of claims 1 to 9, characterized in that: when the heating device, the auxiliary fan and the auxiliary air door, the freezing fan, the compressor, the freezing air door and the cold storage air door are simultaneously included, the control method comprises the following steps:

a detection step, which is used for detecting the temperature T of the evaporator when the refrigerator operates normally;

a judging step, namely judging the magnitude relation between the temperature T of the evaporator and T1; wherein T1 is a preset temperature threshold for entering the defrosting mode;

controlling, namely controlling the heating device, the auxiliary fan and the auxiliary air door to be opened when T is less than or equal to T1, and controlling the freezing fan, the compressor, the freezing air door and the cold storage air door to be closed at the same time to enter a defrosting mode; and when T is more than T1, the freezing fan, the compressor, the freezing air door and the cold storage air door are controlled to be opened, and the heating device, the auxiliary fan and the auxiliary air door are controlled to be closed to enter a normal refrigeration mode.

11. The control method according to claim 10, characterized in that:

the detecting step is also used for detecting the temperature T of the evaporator in the defrosting mode of the refrigerator;

the judging step is also used for judging the magnitude relation between the temperature T of the evaporator and T2, wherein T2 is more than T1, and T2 is a preset temperature critical value for the first closing of the electric heating pipe;

controlling, namely controlling the heating device to be closed, controlling the auxiliary fan and the auxiliary air door to be opened and controlling the freezing fan, the compressor, the freezing air door and the cold storage air door to be closed when T is more than or equal to T2; and when T1 is more than T and less than T2, the heating device, the auxiliary fan and the auxiliary air door are controlled to be opened, and the freezing fan, the compressor, the freezing air door and the cold storage air door are controlled to be closed simultaneously, so that the defrosting mode is continuously operated.

12. The control method according to claim 11, characterized in that:

the detecting step is also used for detecting the temperature T of the evaporator in the defrosting mode of the refrigerator;

the judging step is also used for judging whether the temperature T of the evaporator continuously and rapidly rises, namely whether the delta T/delta T is more than or equal to T preset or not, and T is time;

a control step, when the delta T/delta T is larger than or equal to T preset, controlling the heating device to be closed, controlling the auxiliary fan and the auxiliary air door to be opened, and simultaneously controlling the freezing fan, the compressor, the freezing air door and the cold storage air door to be closed; and when the delta T/delta T is less than T preset, controlling the heating device, the auxiliary fan and the auxiliary air door to be opened, and simultaneously controlling the freezing fan, the compressor, the freezing air door and the cold storage air door to be closed, and continuously operating the defrosting mode.

13. The control method according to claim 12, characterized in that:

the detection step is used for detecting the temperature T of the evaporator in a defrosting mode of the refrigerator when the temperature T of the evaporator is judged to be continuously and rapidly increased and the control step of the evaporator is continuously preset for preset time T and when delta T/delta T is not less than T preset;

the judging step is also used for judging the magnitude relation between T and a third preset temperature T3, wherein T3 is more than T2, and T3 is a preset temperature critical value for exiting the defrosting mode;

controlling, namely controlling the heating device, the auxiliary fan and the auxiliary air door, and controlling the freezing air door and the refrigerating air door to be closed, controlling the compressor to be opened and exiting the defrosting mode when T is more than or equal to T3; and when T is less than T3, the heating device, the auxiliary fan and the auxiliary air door are controlled to be opened, and the freezing fan, the compressor, the freezing air door and the cold storage air door are controlled to be closed to enter a defrosting mode.

14. The control method according to claim 13, characterized in that:

the detection step is also used for detecting the temperature T of the evaporator in the defrosting mode of the refrigerator after the defrosting mode exits;

the judging step is also used for judging the magnitude relation between T and a fourth preset temperature T4, wherein T4 is the dew point temperature of the circulating gas after defrosting;

in the control step, when T is more than or equal to T4 and T4-2, the auxiliary fan and the auxiliary air door are controlled to be opened, the freezing fan, the freezing air door and the cold storage air door are all closed, the compressor is controlled to be opened, the compressor is operated at the frequency f, and the dehumidification mode is started; and when T is less than T4-2 or T is more than T4, the heating device, the auxiliary fan and the auxiliary air door, the freezing air door and the cold storage air door are controlled to be closed, the compressor is controlled to be opened, and the air is continuously heated after entering the defrosting mode.

15. The control method according to claim 14, characterized in that:

the detecting step is also used for detecting the humidity d of the gas after entering the dehumidification mode;

the judging step is also used for judging the size relationship between the humidity d and the preset humidity d 1;

in the control step, when d is less than or equal to d1, the auxiliary fan and the auxiliary air door are controlled to be closed, the freezing fan, the freezing air door and the cold storage air door are controlled to be opened, the compressor is controlled to be opened and normally run, and the normal refrigeration mode is re-entered with the frequency of f 1; and when d is larger than d1, the auxiliary fan and the auxiliary air door are controlled to be opened, the freezing fan, the freezing air door and the cold storage air door are all closed, the compressor is controlled to be opened, the operation is carried out at the frequency f, and the dehumidification mode is entered again, wherein f is smaller than f 1.

16. A refrigerator, characterized in that:

the refrigerator dehumidifying and defrosting apparatus comprising any one of claims 1 to 9.

Technical Field

The disclosure relates to the technical field of refrigerators, in particular to a refrigerator dehumidifying and defrosting device, a control method and a refrigerator.

Background

The existing air-cooled refrigerators have an automatic defrosting function, and an electric heating defrosting mode is generally adopted. The electric heating pipe is arranged below the evaporator and is opened all the time after entering a defrosting mode, natural convection is formed by heating air and the heat radiation of the electric heating pipe is used for defrosting the evaporator, the defrosting efficiency is low, the defrosting time is long, the defrosting power consumption is high, the temperature rise of the freezing chamber is high, and the defects are more. And a large amount of frost water remains on the surface of the evaporator after defrosting, the humidity in the evaporation cavity is too high, so that after refrigeration is restarted, the evaporator firstly cools and dehumidifies the part of frost water and humid air, and the time is high in power and high in work consumption.

Patent No. CN205593264U removes electric heater to an increased defrosting passageway, when the operation of defrosting, inhales the higher air of temperature of compartment to the defrosting passageway and gets into the evaporation chamber through the fan, continuously carries out the defrosting to the evaporimeter. Because the electric heating device is removed, only the power consumed by the running of the fan is available during defrosting, the power consumption is very low, but a defrosting heater is not available, defrosting is carried out only by the compartment temperature which is not high enough, the defrosting efficiency is not high enough, and the defrosting time is long; if the defrosting is not clean and residual ice is left, the surface of the residual ice can continuously frost when the next refrigeration is carried out, and the residual ice is more difficult to be defrosted, so that the refrigeration capacity of the evaporator is influenced.

The problems of low defrosting efficiency, long defrosting time and high defrosting power consumption of the refrigerator in the prior art exist in the running process of the refrigerator; the temperature of the freezing chamber rises back to be higher, and the refrigerating time is long after the freezing chamber recovers; the temperature and the humidity of an evaporation cavity are high after defrosting, so that the problems of large frosting amount, large power consumption and the like in the refrigeration period of an evaporator are caused, and therefore the refrigerator dehumidifying and defrosting device, the control method and the refrigerator are researched and designed.

BRIEF SUMMARY OF THE PRESENT DISCLOSURE

Therefore, the technical problem to be solved by the present disclosure is to overcome the defects of low defrosting efficiency, long defrosting time and high defrosting power consumption of a refrigerator in the operation process of the refrigerator in the prior art, so as to provide a refrigerator dehumidifying and defrosting device, a control method and a refrigerator.

In order to solve the above problems, the present disclosure provides a refrigerator dehumidifying and defrosting device, which includes:

the evaporator is arranged in the air outlet duct, the auxiliary fan is arranged in the auxiliary air duct or in the position where the air outlet duct and the auxiliary air duct are connected, the heating device is also arranged in the air outlet duct or in the auxiliary air duct or in the position where the air outlet duct and the auxiliary air duct are connected, one end of the air outlet duct can be communicated with one end of the auxiliary air duct, the other end of the air outlet duct can be communicated with the other end of the auxiliary air duct, and therefore the air outlet duct and air flow in the auxiliary air duct can form internal circulation.

In some embodiments, an auxiliary air door is arranged at a position where the auxiliary air duct is connected with the air outlet duct, the auxiliary air duct can be opened through the auxiliary air door so that the auxiliary air duct is communicated with the air outlet duct, and the auxiliary air duct can be closed through the auxiliary air door so that the auxiliary air duct is not communicated with the air outlet duct.

In some embodiments, the air outlet duct is disposed in a freezing chamber of the refrigerator, and a freezing air outlet is further disposed on the air outlet duct, wherein one end of the freezing air outlet is communicated with the inside of the air outlet duct, and the other end of the freezing air outlet is communicated with the freezing chamber; and/or the presence of a gas in the gas,

and a freezing air return port is also arranged on the air outlet duct, one end of the freezing air return port is communicated with the inside of the air outlet duct, and the other end of the freezing air return port is communicated with the freezing chamber.

In some embodiments, a freezing fan is further arranged at the freezing air outlet and/or the freezing air return outlet; and/or the presence of a gas in the gas,

the freezing air outlet or the freezing air return port is also provided with a freezing air door, the freezing air outlet or the freezing air return port can be opened through the freezing air door, and the freezing air outlet or the freezing air return port can be closed through the freezing air door.

In some embodiments, the freezing return air duct is located in the freezing chamber and is communicated with the freezing chamber, and the freezing return air duct is also communicated with the freezing return air inlet.

In some embodiments, the refrigerator further comprises a refrigeration air inlet duct, one end of the refrigeration air inlet duct is communicated with the air outlet duct, the other end of the refrigeration air inlet duct is communicated with the inside of a refrigerating chamber of the refrigerator, and air in the air outlet duct can enter the refrigerating chamber through the refrigeration air inlet duct; and/or the presence of a gas in the gas,

the refrigerator is characterized by further comprising a refrigerating return air duct, one end of the refrigerating return air duct is communicated with the inside of the refrigerating chamber of the refrigerator, the other end of the refrigerating return air duct is communicated with the air outlet duct, and air in the refrigerating chamber can be made to return into the air outlet duct through the refrigerating return air duct.

In some embodiments, the cold-stored air inlet duct with the department that meets in air outlet duct, or at cold-stored return air duct with the department that meets in air outlet duct still is provided with cold-stored air door, through cold-stored air door can open cold-stored air inlet duct or cold-stored return air duct, through cold-stored air door can also close cold-stored air inlet duct or close cold-stored return air duct.

In some embodiments, a temperature sensor is disposed on the evaporator, operable to detect a temperature T of the evaporator; and/or a humidity sensor is arranged inside the auxiliary air duct or inside the air outlet duct; and/or the refrigerator dehumidifying and defrosting device further comprises a compressor.

In some embodiments, the water-collecting device further comprises a water-collecting tray and a drain pipe, wherein the water-collecting tray can receive condensed water, and the drain pipe is communicated with the water-collecting tray.

The present disclosure also provides a control method of the refrigerator dehumidifying and defrosting apparatus as described in any one of the above, characterized in that: when the heating device, the auxiliary fan and the auxiliary air door, the freezing fan, the compressor, the freezing air door and the cold storage air door are simultaneously included, the control method comprises the following steps:

a detection step, which is used for detecting the temperature T of the evaporator when the refrigerator operates normally;

a judging step, namely judging the magnitude relation between the temperature T of the evaporator and T1; wherein T1 is a preset temperature threshold for entering the defrosting mode;

controlling, namely controlling the heating device, the auxiliary fan and the auxiliary air door to be opened when T is less than or equal to T1, and controlling the freezing fan, the compressor, the freezing air door and the cold storage air door to be closed at the same time to enter a defrosting mode; and when T is more than T1, the freezing fan, the compressor, the freezing air door and the cold storage air door are controlled to be opened, and the heating device, the auxiliary fan and the auxiliary air door are controlled to be closed to enter a normal refrigeration mode.

In some embodiments, the detecting step is further configured to detect a temperature T of the evaporator in a defrosting mode of the refrigerator;

the judging step is also used for judging the magnitude relation between the temperature T of the evaporator and T2, wherein T2 is more than T1, and T2 is a preset temperature critical value for the first closing of the electric heating pipe;

controlling, namely controlling the heating device to be closed, controlling the auxiliary fan and the auxiliary air door to be opened and controlling the freezing fan, the compressor, the freezing air door and the cold storage air door to be closed when T is more than or equal to T2; and when T1 is more than T and less than T2, the heating device, the auxiliary fan and the auxiliary air door are controlled to be opened, and the freezing fan, the compressor, the freezing air door and the cold storage air door are controlled to be closed simultaneously, so that the defrosting mode is continuously operated.

In some embodiments, the detecting step is further configured to detect a temperature T of the evaporator in a defrosting mode of the refrigerator;

the judging step is also used for judging whether the temperature T of the evaporator continuously and rapidly rises, namely whether the delta T/delta T is more than or equal to T preset or not, and T is time;

a control step, when the delta T/delta T is larger than or equal to T preset, controlling the heating device to be closed, controlling the auxiliary fan and the auxiliary air door to be opened, and simultaneously controlling the freezing fan, the compressor, the freezing air door and the cold storage air door to be closed; and when the delta T/delta T is less than T preset, controlling the heating device, the auxiliary fan and the auxiliary air door to be opened, and simultaneously controlling the freezing fan, the compressor, the freezing air door and the cold storage air door to be closed, and continuously operating the defrosting mode.

In some embodiments, the detecting step is further configured to detect the temperature T of the evaporator in the defrosting mode of the refrigerator when Δ T/[ delta ] T ≧ T is preset after determining whether the temperature T of the evaporator continues to be rapidly increased and the controlling step thereof continues for a preset time T preset;

the judging step is also used for judging the magnitude relation between T and a third preset temperature T3, wherein T3 is more than T2, and T3 is a preset temperature critical value for exiting the defrosting mode;

controlling, namely controlling the heating device, the auxiliary fan and the auxiliary air door, and controlling the freezing air door and the refrigerating air door to be closed, controlling the compressor to be opened and exiting the defrosting mode when T is more than or equal to T3; and when T is less than T3, the heating device, the auxiliary fan and the auxiliary air door are controlled to be opened, and the freezing fan, the compressor, the freezing air door and the cold storage air door are controlled to be closed to enter a defrosting mode.

In some embodiments, the detecting step is further configured to detect the temperature T of the evaporator in the refrigerator defrosting mode after exiting the defrosting mode;

the judging step is also used for judging the magnitude relation between T and a fourth preset temperature T4, wherein T4 is the dew point temperature of the circulating gas after defrosting;

in the control step, when T is more than or equal to T4 and T4-2, the auxiliary fan and the auxiliary air door are controlled to be opened, the freezing fan, the freezing air door and the cold storage air door are all closed, the compressor is controlled to be opened, the compressor is operated at the frequency f, and the dehumidification mode is started; and when T is less than T4-2 or T is more than T4, the heating device, the auxiliary fan and the auxiliary air door, the freezing air door and the cold storage air door are controlled to be closed, the compressor is controlled to be opened, and the air is continuously heated after entering the defrosting mode.

In some embodiments, the detecting step is further configured to detect the humidity d of the gas after entering the dehumidification mode;

the judging step is also used for judging the size relationship between the humidity d and the preset humidity d 1;

in the control step, when d is less than or equal to d1, the auxiliary fan and the auxiliary air door are controlled to be closed, the freezing fan, the freezing air door and the cold storage air door are controlled to be opened, the compressor is controlled to be opened and normally run, and the normal refrigeration mode is re-entered with the frequency of f 1; and when d is larger than d1, the auxiliary fan and the auxiliary air door are controlled to be opened, the freezing fan, the freezing air door and the cold storage air door are all closed, the compressor is controlled to be opened, the operation is carried out at the frequency f, and the dehumidification mode is entered again, wherein f is smaller than f 1.

The present disclosure also provides a refrigerator including the refrigerator dehumidifying and defrosting apparatus of any one of the above.

The refrigerator dehumidification and defrosting device, the control method and the refrigerator provided by the disclosure have the following beneficial effects:

1. according to the refrigerator defrosting device, the auxiliary air duct, the heating device and the auxiliary fan are arranged in the refrigerator freezing chamber, the auxiliary air duct is communicated with the air outlet duct to form an air flow circulation channel, when defrosting is performed, the electric heating pipe is selectively switched on and off according to the defrosting condition of the evaporator, heat generated by the electric heating pipe is uniformly blown to the evaporator under the action of the auxiliary fan and is blown to the evaporator again through the auxiliary air duct to form hot air circulation, the defrosting efficiency is improved, the defrosting time is shortened, and the defrosting power consumption is reduced;

2. according to the defrosting device, the auxiliary fan is started, the freezing fan is closed, circulating hot air circulates in the evaporation cavity and the auxiliary air duct only by virtue of the auxiliary fan, the electric heating pipe is intermittently started, the temperature of the freezing chamber rises slightly, and the time required for recovering refrigeration is short, so that the storage effect is improved;

3. this disclosed dehumidification defrosting device is before normal refrigeration, and the compressor is opened, makes the evaporimeter preliminary cooling to carry the high humid gas of gathering in the evaporation chamber upper end earlier to the evaporimeter through supplementary wind channel and dehumidify, the frosting volume of evaporimeter when reducing normal refrigeration, thereby reduce the refrigeration consumption, improve heat exchange efficiency.

Drawings

FIG. 1 is a rear view structural view of a refrigerator incorporating a refrigerator defrosting and dehumidifying apparatus of the present disclosure;

FIG. 2 is a side view structural diagram of a refrigerator incorporating the refrigerator defrosting and dehumidifying apparatus of the present disclosure;

fig. 3 is a control flow chart of a control method of the refrigerator dehumidifying and defrosting apparatus of the present disclosure.

The reference numerals are represented as:

1. a box body; 2. a refrigerating chamber; 3. a freezing chamber; 4. a refrigeration door; 5. a freezing door; 6. a refrigeration air inlet duct; 7. an air outlet duct; 8. a refrigerated return air duct; 9. a freezing return air duct; 10. an auxiliary air duct; 11. a freezing air outlet; 12. a freezing air return opening; 13. a freezing fan; 14. an auxiliary fan; 15. an evaporator; 16. a heating device; 17. a shelf; 18. a drawer; 19. an auxiliary damper; 20. a water pan; 21. and a water discharge pipe.

Detailed Description

As shown in fig. 1 to 3, the present disclosure provides a dehumidifying and defrosting apparatus for a refrigerator, which includes:

the evaporator 15 is arranged in an air outlet duct 7 (namely an evaporation cavity), the auxiliary fan 14 is arranged in the auxiliary air duct 10 or in the position where the air outlet duct 7 and the auxiliary air duct 10 are connected, the heating device 16 is also arranged in the air outlet duct 7 or in the auxiliary air duct 10 or in the position where the air outlet duct 7 and the auxiliary air duct 10 are connected, one end of the air outlet duct 7 can be communicated with one end of the auxiliary air duct 10, the other end of the air outlet duct 7 can be communicated with the other end of the auxiliary air duct 10, and therefore the air outlet duct 7 and air flow in the auxiliary air duct 10 can form internal circulation.

1. The utility model discloses a through the supplementary wind channel that sets up in refrigerator freezer, heating device and auxiliary fan, supplementary wind channel forms the air current circulation passageway with air-out wind channel intercommunication, during the defrosting, electric heating pipe is according to the selective switch of evaporimeter defrosting condition, the even evaporimeter that blows to of heat that produces electric heating pipe under auxiliary fan's effect, and blow once more to the evaporimeter through supplementary wind channel, form hot air circulation, promote defrosting efficiency, reduce the time of defrosting, reduce the defrosting consumption, compare in direct arrange electric heater in the freezer and adopt the defrosting passageway (not set up electric heater) effectively to have solved refrigerator defrosting inefficiency simultaneously, the time of defrosting is longer, the problem that the defrosting consumption is high.

2. Because the auxiliary fan is started, the freezing fan is closed, the circulating hot air circulates in the evaporation cavity and the auxiliary air duct only by the auxiliary fan, the electric heating pipe is intermittently started, the temperature of the freezing chamber rises back slightly, and the time required for recovering the refrigeration again is short, so that the storage effect is improved;

3. before normal refrigeration, the compressor is opened, makes the evaporimeter preliminary cooling to carry the high humid gas of gathering in evaporation chamber upper end to the evaporimeter through supplementary wind channel earlier and dehumidify, the frosting volume of evaporimeter when reducing normal refrigeration, thereby reduce the refrigeration consumption, improve heat exchange efficiency.

The invention effectively solves the following technical problems:

1. the refrigerator has the problems of low defrosting efficiency, long defrosting time and high defrosting power consumption;

2. the temperature of the freezing chamber rises back to be higher, and the refrigerating time is long after the freezing chamber recovers;

3. the temperature and the humidity of an evaporation cavity are high after defrosting, so that the defrosting quantity of the evaporator is large in the refrigeration period, and the power consumption is large.

In some embodiments, an auxiliary air door 19 is disposed at a position where the auxiliary air duct 10 is connected to the air outlet duct 7, the auxiliary air duct 10 can be opened through the auxiliary air door 19, so that the auxiliary air duct 10 is communicated with the air outlet duct 7, and the auxiliary air duct 10 can be closed through the auxiliary air door 19, so that the auxiliary air duct 10 is not communicated with the air outlet duct 7. This is the further preferred structural style of this refrigerator dehumidification defrosting device of this disclosure, through still being provided with the auxiliary air door in the position that auxiliary air duct and air-out wind channel meet, can effectively play the effect of opening or closing auxiliary air duct for open the auxiliary air door when needing to open the internal circulation, so that auxiliary air duct and air-out wind channel intercommunication become the internal circulation route, close the auxiliary air door when need not open the heating internal circulation, close the internal circulation, thereby form the effect whether control internal circulation fluid route formed.

In the invention, an auxiliary air duct is added at the back of a freezing chamber, and an auxiliary fan and an auxiliary air door which are matched with the auxiliary air duct are additionally arranged to form a special dehumidifying and defrosting channel, as shown in attached figures 1 and 2. The air inlet end of the auxiliary air duct is connected to the upper end of the evaporation cavity, and the air outlet end of the auxiliary air duct is connected to the electric heating pipe and is parallel to the electric heating pipe. The auxiliary air door is positioned at the air outlet, the specific position of the auxiliary fan is not limited, the auxiliary fan can be positioned beside the auxiliary air door and also can be positioned in the auxiliary air duct, and only the gas can form internal circulation between the evaporation cavity and the auxiliary air duct.

In some embodiments, the air outlet duct 7 is disposed in the freezing chamber 3 of the refrigerator, a freezing air outlet 11 is further disposed on the air outlet duct 7, and one end of the freezing air outlet 11 is communicated with the inside of the air outlet duct 7, and the other end is communicated with the freezing chamber 3; and/or the presence of a gas in the gas,

and a freezing air return opening 12 is further arranged on the air outlet duct 7, one end of the freezing air return opening 12 is communicated with the inside of the air outlet duct 7, and the other end of the freezing air return opening is communicated with the freezing chamber 3.

This disclosure is still through the setting of freezing air outlet, can make through the air-out wind channel by the cold air after the evaporimeter cooling down can get into the freezer, freeze food etc. in the freezer to the refrigerator, can make the gas in the freezer can be inhaled in the air-out wind channel through freezing return air inlet, further by the evaporimeter cooling, can effectively continuously guarantee to last effectual refrigeration effect of food etc. in the freezer.

In some embodiments, a freezing fan 13 is further provided at the freezing air outlet 11 and/or at the freezing air return 12; and/or the presence of a gas in the gas,

a freezing air door is further arranged at the freezing air outlet 11 or the freezing air return opening 12, the freezing air outlet 11 or the freezing air return opening 12 can be opened through the freezing air door, and the freezing air outlet 11 or the freezing air return opening 12 can be closed through the freezing air door.

This disclosure is through freezing fan at freezing air outlet and/or freezing return air inlet setting, can drive effectively in the air-out wind channel by the cold air after the evaporimeter cooling in being insufflated the freezer, perhaps inhale the air in the air-out wind channel from freezing return air inlet with the freezer by the cooling, further promote in the air-out wind channel last effectual cold air gets into the freezer, setting through freezing air door, can play effectively and open or close the effect in the air-out wind channel whether gets into the freezer, make and open freezing air door when the cooling is carried out to the freezer to the needs, close freezing air door when need not carry out the refrigeration cooling to the freezer.

In some embodiments, a freezing return air duct 9 is further included, the freezing return air duct 9 is located in the freezing chamber 3 and is communicated with the freezing chamber 3, and the freezing return air duct 9 is also communicated with the freezing return air inlet 12; and/or the presence of a gas in the gas,

the evaporator 15, the heating device 16, the auxiliary air duct 10, and the auxiliary fan 14 are all disposed in the freezing chamber 3.

The freezing return air duct can effectively guide the air in the freezing chamber into the air outlet duct through the freezing return air duct, and the air is further cooled by the evaporator; the evaporator, the heating device, the auxiliary air duct and the auxiliary air duct are preferably arranged in the freezing chamber, the evaporator and the heating device are preferably arranged in the air outlet duct, and the auxiliary fan is preferably arranged at the position where the auxiliary air duct is connected with the air outlet duct.

In some embodiments, the refrigerator further comprises a refrigeration air inlet duct 6, one end of the refrigeration air inlet duct 6 is communicated with the air outlet duct 7, the other end of the refrigeration air inlet duct 6 is communicated with the inside of the refrigerating chamber 2 of the refrigerator, and air in the air outlet duct 7 can enter the refrigerating chamber 2 through the refrigeration air inlet duct 6; and/or the presence of a gas in the gas,

still include cold-stored return air duct 8, cold-stored return air duct 8 one end and the inside intercommunication of the walk-in 2 of refrigerator, the other end with air-out wind channel 7 intercommunication, through cold-stored return air duct 8 can make wind in the walk-in 2 returns air-out wind channel 7.

This disclosure still through the setting in cold-stored air inlet wind channel, can follow the cold air that is introduced by evaporimeter cooling in the air-out wind channel to cool off in to the walk-in, reach cold-stored effect, through the setting in cold-stored return air wind channel, can lead the gas in the walk-in back to the air-out wind channel, further by carrying out cooling, accomplish the transportation of cold air and the effect that shifts, guarantee the cold-stored temperature that is low enough in the walk-in.

In some embodiments, the cold-stored air inlet duct 6 with the department that meets in air outlet duct 7, or at cold-stored return air duct 8 with air outlet duct 7 meets and still is provided with cold-stored air door, through cold-stored air door can open cold-stored air inlet duct 6 or cold-stored return air duct 8, through cold-stored air door can also close cold-stored air inlet duct 6 or close cold-stored return air duct 8.

Through the setting of cold-stored air door, can play the effect whether the air that opens or close in the air-out wind channel gets into the walk-in effectively for open cold-stored air door when needs refrigerate the cooling to the walk-in, close cold-stored air door when need not refrigerate the cooling to the walk-in.

In some embodiments, a temperature sensor is provided on the evaporator 15, which can be used to detect the temperature T of the evaporator 15; and/or a humidity sensor is arranged inside the auxiliary air duct 10 or inside the air outlet duct 7; and/or the refrigerator dehumidifying and defrosting device further comprises a compressor.

This is disclosed still through set up temperature sensor on the evaporimeter, can detect the real-time temperature of evaporimeter effectively, and the humidity transducer that supplementary wind channel or air-out wind channel set up can detect the humidity of the air in the inner loop wind channel effectively, and the compressor is the refrigerator compressor, the effect of compressed refrigerant when accomplishing normal refrigeration.

In some embodiments, the water-containing device further comprises a water-containing tray 20 and a drain pipe 21, wherein the water-containing tray 20 can receive condensed water, and the drain pipe 21 is communicated with the water-containing tray 20. The evaporator can effectively receive the condensed water generated at the upper end, the lower end or the periphery of the evaporator through the water receiving disc, and the condensed water can be effectively discharged outwards through the drain pipe.

The present disclosure also provides a control method of the refrigerator dehumidifying and defrosting apparatus as set forth in any one of the above, wherein: when the heating device, the auxiliary fan and the auxiliary air door, the freezing fan, the compressor, the freezing air door and the cold storage air door are simultaneously included, the control method comprises the following steps:

a detection step, which is used for detecting the temperature T of the evaporator when the refrigerator operates normally;

a judging step, namely judging the magnitude relation between the temperature T of the evaporator and T1; wherein T1 is a preset temperature threshold for entering the defrosting mode;

controlling, namely controlling the heating device, the auxiliary fan and the auxiliary air door to be opened when T is less than or equal to T1, and controlling the freezing fan, the compressor, the freezing air door and the cold storage air door to be closed at the same time to enter a defrosting mode; and when T is more than T1, the freezing fan, the compressor, the freezing air door and the cold storage air door are controlled to be opened, and the heating device, the auxiliary fan and the auxiliary air door are controlled to be closed to enter a normal refrigeration mode.

The invention provides a refrigerator dehumidification and defrosting device and a control method thereof.A supplementary air duct is added at the back of a freezing chamber, and a supplementary fan and a supplementary air door which are matched with the supplementary air duct are additionally arranged to form a special dehumidification and defrosting channel. And a temperature sensor is arranged at the bottom end of an inlet pipe of the evaporator, and a humidity sensor and an air temperature sensor are respectively arranged at an air inlet of the auxiliary air duct so as to monitor the temperature of the evaporator, the temperature of circulating gas in a cavity of the evaporator and the change of the humidity in real time.

When evaporimeter temperature T is less than or equal to T1, freezing fan, compressor, cold-stored air door, freezing air door are closed, get into the mode of changing frost, and electric heating pipe, auxiliary fan, auxiliary air door are opened, and electric heating pipe is according to the selective switch of the condition of changing frost of evaporimeter, promotes the efficiency of changing frost, reduces the time of changing frost, reduces the power consumption of changing frost, promptly:

FIG. 3 is a schematic diagram of the control logic for a refrigerator, wherein T1< T2< T3 is the temperature of the evaporator monitored in real time by the temperature sensor; t1 is a preset temperature threshold for entering the defrost mode; t2 is a preset temperature threshold for the first closing of the electric heating tube; t3 is a preset temperature threshold for exiting the defrost mode; t4 is the dew point temperature of the high temperature and high humidity gas after defrosting, because the condition that water is condensed into ice is that the temperature and the cold quantity both meet the requirements, and some heat loss exists in the process of heat exchange between the high temperature and high humidity gas and the evaporator, when the temperature of the tube of the evaporator is slightly lower than the dew point temperature, the tube can be only condensed without frosting. d is the humidity of the circulating gas monitored by the humidity sensor in real time; d1 is a preset humidity threshold value for ending the dehumidification process.

In the normal refrigeration cycle process of the existing refrigerator, a compressor works, a freezing fan, a refrigeration air door and a freezing air door are opened, and low-temperature gas is respectively conveyed to a refrigeration chamber and a freezing chamber through the freezing fan and an air outlet duct to be in a low-temperature state; meanwhile, the return air of the refrigerating chamber and the freezing chamber returns to the evaporator through the return air duct, and flows into the refrigerating chamber and the freezing chamber again after exchanging heat with the evaporator, and the circulation is carried out, so that the refrigerating chamber and the freezing chamber are kept in a low-temperature state. However, when air returns from the refrigerating chamber, the high-temperature and high-humidity air firstly passes through the bottom end of the evaporator and frosts, and the frosting at the bottom end of the evaporator is the most serious. In the defrosting process, the compressor, the freezing fan, the cold storage air door and the freezing air door are closed, the electric heating pipe starts to work to defrost, and the evaporated defrosting water floats and gathers at the top end of the evaporation cavity.

Therefore, a temperature sensor is arranged at the bottom end of an inlet pipe of the evaporator to monitor the temperature change of the evaporator in real time; a humidity sensor and an air temperature sensor are respectively arranged at an air inlet of the auxiliary air duct to monitor the temperature and the humidity change of circulating gas of the evaporation chamber in real time, the dew point temperature of the circulating gas is obtained according to the temperature and the humidity of the circulating gas, and the temperature is fed back to the control system to ensure that the temperature of the evaporator is always in the dew point temperature range of the circulating gas in the dehumidification stage, so that the circulating gas is prevented from frosting on the evaporator. The specific operation is as follows:

when the air conditioner is normally used for refrigeration, the compressor works, and the auxiliary air door and the auxiliary fan are closed to prevent cold air from entering the auxiliary air duct to cause cold loss; the freezing fan, the cold storage air door and the freezing air door are opened, and the freezing fan respectively conveys cold air sucked from the evaporator to the freezing chamber and the cold storage chamber to enable the cold air to be in a low-temperature state.

And when the temperature T of the evaporator is less than or equal to T1, closing the freezing fan, the compressor, the cold storage air door and the freezing air door, entering a defrosting mode, and opening the electric heating pipe, the auxiliary fan and the auxiliary air door. At this moment, the hot air that electric heating pipe produced is blown to the evaporimeter by auxiliary fan uniformly to form heated air circulation through the supplementary wind channel, continuously change the frost to the evaporimeter, reduce the time of changing the frost, promote the efficiency of changing the frost. However, if the evaporator temperature does not reach T1, the refrigerator keeps the original operation state and performs normal cooling.

When the temperature T4-2 of the evaporator is not less than T4 (dew point temperature), the freezing fan, the cold storage air door and the freezing air door are closed, the auxiliary fan and the auxiliary air door are opened, the compressor operates at low frequency, the temperature of the evaporator is kept in the range that the temperature T4-2 of the evaporator is not less than T4, high-temperature and high-humidity gas at the upper end of the evaporation cavity is conveyed to the evaporator through the auxiliary air duct for dehumidification, the frosting amount of the evaporator during refrigeration is reduced, the refrigeration power consumption is reduced, and the heat exchange efficiency is improved. And (4) closing the auxiliary fan and the auxiliary air door until the humidity d of the circulating gas is less than or equal to d1, opening the freezing fan, the cold storage air door and the freezing air door, normally operating the compressor and normally refrigerating the refrigerator.

In some embodiments, the detecting step is further configured to detect a temperature T of the evaporator in a defrosting mode of the refrigerator;

the judging step is also used for judging the magnitude relation between the temperature T of the evaporator and T2, wherein T2 is more than T1, and T2 is a preset temperature critical value for the first closing of the electric heating pipe;

controlling, namely controlling the heating device to be closed, controlling the auxiliary fan and the auxiliary air door to be opened and controlling the freezing fan, the compressor, the freezing air door and the cold storage air door to be closed when T is more than or equal to T2; and when T1 is more than T and less than T2, the heating device, the auxiliary fan and the auxiliary air door are controlled to be opened, and the freezing fan, the compressor, the freezing air door and the cold storage air door are controlled to be closed simultaneously, so that the defrosting mode is continuously operated.

When the temperature T of the evaporator is more than or equal to T2, the electric heating pipe is closed, the circulating waste heat is used for defrosting under the action of the auxiliary fan, and the temperature change of the evaporator is monitored; otherwise, the electric heating tube is continuously opened. If the temperature of the evaporator is continuously and rapidly increased, continuously circulating the waste heat to defrost; and otherwise, the electric heating pipe is opened again, the electric heating pipe is closed after a period of time, the electric heating pipe is closed under the action of the auxiliary fan, the defrosting is carried out by circulating waste heat, the temperature change of the evaporator is monitored, the circulation is carried out until the temperature of the evaporator is continuously and rapidly increased and the temperature T of the evaporator is more than or equal to T3, the compressor is opened at the moment, the electric heating pipe, the auxiliary fan, the auxiliary air door, the freezing fan, the cold storage air door and the freezing air door are closed, and the defrosting mode is exited.

In some embodiments, the detecting step is further configured to detect a temperature T of the evaporator in a defrosting mode of the refrigerator;

the judging step is also used for judging whether the temperature T of the evaporator continuously and rapidly rises, namely whether the delta T/delta T is more than or equal to T preset or not, and T is time;

a control step, when the delta T/delta T is larger than or equal to T preset, controlling the heating device to be closed, controlling the auxiliary fan and the auxiliary air door to be opened, and simultaneously controlling the freezing fan, the compressor, the freezing air door and the cold storage air door to be closed; and when the delta T/delta T is less than T preset, controlling the heating device, the auxiliary fan and the auxiliary air door to be opened, and simultaneously controlling the freezing fan, the compressor, the freezing air door and the cold storage air door to be closed, and continuously operating the defrosting mode.

After the electric heating pipe works for a period of time, if the temperature of the evaporator does not reach T2, the electric heating pipe is continuously opened. If the temperature T of the evaporator is larger than or equal to T2, the electric heating pipe is closed, the waste heat is circulated under the action of the auxiliary fan to defrost, and the temperature change of the evaporator is monitored. If the temperature of the evaporator continuously and rapidly rises, the evaporator is always in a defrosting state, and the electric heating pipe is still closed at the moment; if the temperature of the evaporator is unchanged or slowly rises, the defrosting is weakened, at the moment, the electric heating pipe is opened again, the electric heating pipe is closed after a period of time, the electric heating pipe circulates the waste heat to defrost under the action of the auxiliary fan, and the temperature change of the evaporator is monitored.

In some embodiments, the detecting step is further configured to detect the temperature T of the evaporator in the defrosting mode of the refrigerator when Δ T/[ delta ] T ≧ T is preset after determining whether the temperature T of the evaporator continues to be rapidly increased and the controlling step thereof continues for a preset time T preset;

the judging step is also used for judging the magnitude relation between T and a third preset temperature T3, wherein T3 is more than T2, and T3 is a preset temperature critical value for exiting the defrosting mode;

controlling, namely controlling the heating device, the auxiliary fan and the auxiliary air door, and controlling the freezing air door and the refrigerating air door to be closed, controlling the compressor to be opened and exiting the defrosting mode when T is more than or equal to T3; and when T is less than T3, the heating device, the auxiliary fan and the auxiliary air door are controlled to be opened, and the freezing fan, the compressor, the freezing air door and the cold storage air door are controlled to be closed to enter a defrosting mode.

When the temperature of the evaporator continuously and rapidly rises and meets the condition that the temperature T of the evaporator is not less than T3, the compressor is started, the electric heating pipe, the freezing fan, the cold storage air door and the freezing air door are closed, the defrosting mode is exited, and the auxiliary fan and the auxiliary air door are also closed, so that the temperature of the evaporator can be rapidly reduced; if the temperature of the evaporator is not changed or slowly rises, or the temperature of the evaporator does not reach T3, the electric heating pipe is turned on again and is turned off after a period of time, and the process is circulated until the condition of exiting defrosting is met.

Wherein T1< T2< T3, T is the temperature of the evaporator monitored by the temperature sensor in real time; t1 is a preset temperature threshold for entering the defrost mode; t2 is a preset temperature threshold for the first closing of the electric heating tube; t3 is a preset temperature threshold for exiting defrost mode. The selective switching electric heating pipe is come to the real-time defrosting state through the evaporimeter to form steam circulation under the effect in auxiliary fan and supplementary wind channel, not only can avoid electric heating pipe to open always, reduce the energy consumption of changing the frost, reduce the time of changing the frost, can also accurately change the frost, improve the efficiency of changing the frost. In addition, in the defrosting process, the auxiliary fan is started, the freezing fan is closed, circulating hot air circulates in the evaporation cavity and the auxiliary air duct only by the auxiliary fan, the temperature of the freezing chamber rises slightly, and the time required for recovering refrigeration is short, so that the storage effect is improved.

In some embodiments, the detecting step is further configured to detect the temperature T of the evaporator in the refrigerator defrosting mode after exiting the defrosting mode;

the judging step is also used for judging the magnitude relation between T and a fourth preset temperature T4, wherein T4 is the dew point temperature of the circulating gas after defrosting;

in the control step, when T is more than or equal to T4 and T4-2, the auxiliary fan and the auxiliary air door are controlled to be opened, the freezing fan, the freezing air door and the cold storage air door are all closed, the compressor is controlled to be opened, the compressor is operated at the frequency f (low frequency), and the dehumidification mode is started; and when T is less than T4-2 or T is more than T4, the heating device, the auxiliary fan and the auxiliary air door, the freezing air door and the cold storage air door are controlled to be closed, the compressor is controlled to be opened, and the air is continuously heated after entering the defrosting mode.

In some embodiments, the detecting step is further configured to detect the humidity d of the gas after entering the dehumidification mode;

the judging step is also used for judging the size relationship between the humidity d and the preset humidity d 1;

in the control step, when d is less than or equal to d1, the auxiliary fan and the auxiliary air door are controlled to be closed, the freezing fan, the freezing air door and the cold storage air door are controlled to be opened, the compressor is controlled to be opened and normally run, and the normal refrigeration mode is entered again when the frequency is f1 (normal frequency); and when d is larger than d1, the auxiliary fan and the auxiliary air door are controlled to be opened, the freezing fan, the freezing air door and the refrigerating air door are all closed, the compressor is controlled to be opened, the system runs at the frequency f (low frequency), and the dehumidification mode is entered again, wherein f is smaller than f 1.

When the temperature T4-2 of the evaporator is not less than T4, the freezing fan, the cold storage air door and the freezing air door are closed, the compressor runs at low frequency, the auxiliary fan and the auxiliary air door are opened, high-temperature and high-humidity gas at the upper end of the evaporation cavity is conveyed to the evaporator through the auxiliary air duct for dehumidification, and the frosting amount on the evaporator during refrigeration is reduced, so that the refrigeration power consumption is reduced, and the heat exchange efficiency is improved; otherwise, the evaporator temperature is continuously decreased.

After dehumidification for a period of time, if the humidity d of the circulating gas is less than or equal to d1, the circulating gas in the evaporation chamber is in a normal refrigeration state, heat exchange with the evaporator is prevented from frosting, at the moment, the auxiliary fan and the auxiliary air door are closed, the freezing fan, the cold storage air door and the freezing air door are opened, the compressor operates normally, and the refrigerator refrigerates normally; if the humidity of the circulating gas is higher than d1, the dehumidification state is continuously maintained. Preferably, the control logic can be set to start normal refrigeration of the refrigerator when the humidity d of the humidity sensor is less than or equal to d1 and the dehumidification time t is more than or equal to t1, so that the condensed water on the evaporator is enabled to completely drop into the defrosting water pan, and the phenomenon that the residual condensed water is cooled and frozen again in normal refrigeration is avoided.

Wherein, T4 is the dew point temperature of the high temperature and high humidity circulating gas after defrosting, because the condition that water condenses into ice is that the temperature and the cold quantity both meet the requirements, and some heat loss exists in the process of heat exchange between the high temperature and high humidity gas and the evaporator, when the temperature of the tube of the evaporator is slightly lower than the dew point temperature, the tube can only condense and not frost. d is the humidity of the circulating gas monitored by the humidity sensor in real time; d1 is a preset humidity threshold value for ending the dehumidification process.

According to the invention, the auxiliary air duct, the auxiliary fan and the auxiliary air door are additionally arranged, and the electric heating pipe is selectively opened and closed according to the defrosting condition of the evaporator in the defrosting stage, so that the defrosting efficiency and the heat exchange efficiency are improved, the defrosting time is shortened, the energy consumption is reduced, in the defrosting and dehumidifying processes, the circulating hot air only circulates in the evaporation cavity and the auxiliary air duct by the auxiliary fan, the temperature of the freezing chamber rises slightly, and the storage effect is improved.

The present disclosure also provides a refrigerator including the refrigerator dehumidifying and defrosting apparatus of any one of the above.

The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present disclosure, and these modifications and variations should also be regarded as the protection scope of the present disclosure.