阅读说明：本技术 冰箱及其化霜控制方法 (Refrigerator and defrosting control method thereof ) 是由 阮兆忠 李洋 许梦琪 邢权 余根 于 2021-10-13 设计创作，主要内容包括：本发明公开一种冰箱及其化霜控制方法,冰箱包括间室、蒸发仓、化霜风道、制冷风道、切换装置和控制器,所述间室与所述蒸发仓之间还设置有回风口,所述化霜风道的出口邻近所述回风口设置,所述冰箱具有化霜模式,在化霜模式下,所述回风口处于打开状态,所述控制器用以控制所述切换装置切换所述化霜风道与所述蒸发仓连通、所述风机和所述加热器处于工作状态、以及所述制冷系统停止工作；本发明的技术方案可以解决在化霜过程中,气流稳定性差且噪声大的问题。(The invention discloses a refrigerator and a defrosting control method thereof, wherein the refrigerator comprises a compartment, an evaporation bin, a defrosting air channel, a refrigerating air channel, a switching device and a controller, wherein an air return opening is also arranged between the compartment and the evaporation bin, an outlet of the defrosting air channel is arranged adjacent to the air return opening, the refrigerator is provided with a defrosting mode, the air return opening is in an open state in the defrosting mode, the controller is used for controlling the switching device to switch the defrosting air channel to be communicated with the evaporation bin, a fan and a heater are in a working state, and a refrigerating system stops working; the technical scheme of the invention can solve the problems of poor airflow stability and large noise in the defrosting process.)

1. A refrigerator, characterized by comprising:

a compartment;

an evaporation bin in which an evaporator of a refrigeration system of the refrigerator is disposed;

the two ends of the defrosting air channel are correspondingly communicated with the evaporation bin to form an internal circulation air channel, and a heater and a fan are arranged in the internal circulation air channel;

one end of the refrigeration air channel is communicated with the compartment, and the other end of the refrigeration air channel is communicated with the evaporation bin to form an external circulation air channel;

the switching device is used for switching one of the defrosting air channel and the refrigerating air channel to be communicated with the evaporation bin; and the number of the first and second groups,

the controller is electrically connected with the refrigerating system, the switching device, the heater and the fan;

the refrigerator is provided with a defrosting mode, the air return port is in an open state in the defrosting mode, the controller is used for controlling the switching device to switch the defrosting air channel to be communicated with the evaporation bin, the fan and the heater are in a working state, and the refrigerating system stops working.

2. The refrigerator as claimed in claim 1, wherein the outlet of the defrosting duct is located between the return air inlet and the evaporator.

3. The refrigerator of claim 1, further comprising a fan housing, wherein the fan housing defines a fan inlet and a fan outlet, wherein the fan is disposed within the fan housing, and wherein the fan inlet is in communication with the evaporation chamber;

inlets of the defrosting air channel and the refrigerating air channel are connected with an air outlet of the fan;

and the switching device switches one of the inlets of the defrosting air channel and the refrigerating air channel to be communicated with the air outlet of the fan.

4. The refrigerator of claim 3, wherein the blower is a centrifugal blower, the blower inlet is disposed at one end of the blower housing, and the blower outlet is disposed at a peripheral side portion of the blower housing;

the refrigeration air channel and the defrosting air channel extend outwards from the peripheral side of the fan shell.

5. The refrigerator according to claim 3 or 4, wherein the cooling air duct comprises a first cooling air duct;

the switching device comprises a first door body and a first driving device, wherein the first door body is movably arranged at the inlets of the defrosting air channel and the first refrigerating air channel, and the first driving device drives the first door body to move.

6. The refrigerator as claimed in claim 5, wherein the defrosting duct and the first cooling duct have their inlets disposed in a converging manner to be connected to an outlet of the blower fan;

one end of the first door body is rotatably installed at the intersection of the defrosting air channel and the inlet of the first refrigerating air channel, and the inlets of the defrosting air channel and the inlet of the first refrigerating air channel are respectively closed and opened on the rotating stroke.

7. The refrigerator as claimed in claim 6, wherein the inlet of the first cooling air duct is communicated with the outlet of the blower fan, and the inlet of the defrosting air duct is disposed on a side wall of the first cooling air duct;

the first door body is rotatably installed on the side wall of the first refrigeration air channel and located at the edge of the defrosting air channel.

8. The refrigerator as claimed in claim 6, wherein a first door frame for sealing the first door is integrally formed at an inlet of the defrosting air duct and/or in the first cooling air duct.

9. The refrigerator as claimed in claim 6, wherein the first driving means includes a first driving motor, and a motor shaft of the first driving motor is connected to a rotation shaft of the first door body.

10. The refrigerator as claimed in claim 5, wherein the cooling air duct is provided in plurality, the plurality of cooling air ducts further includes a second cooling air duct, an inlet of the second cooling air duct is communicated with the outlet of the fan;

the switching device comprises a second door body which is rotatably arranged on the second refrigeration air channel and a second driving device which drives the second door body to move.

11. The refrigerator as claimed in claim 10, wherein a second door frame is formed in the second cooling air duct, and the second door body is rotatably installed at the second door frame; and/or the presence of a gas in the gas,

the second driving device comprises a second driving motor, and a motor shaft of the second driving motor is connected with a rotating shaft of the second door body.

12. The refrigerator of claim 10, wherein the refrigerator further has a zone cooling mode in which the controller controls the first driving device and the second driving device such that the first cooling air duct is in an open state, the second cooling air duct is in a closed state, and the cooling system is in an operating state.

13. The refrigerator as claimed in claim 4, wherein the switching means includes a damper disposed in an arc shape and slidably disposed at an outer circumference of the fan housing, and a damper driving means for driving the damper to slide, the damper opening and closing inlets of the cooling duct and the defrosting duct in its moving stroke.

14. The refrigerator of claim 13, further comprising an air duct cavity disposed between the compartment and the evaporation compartment;

the refrigerating air duct, the defrosting air duct and the fan shell are all arranged in the air duct cavity;

and a water baffle is arranged in the air duct cavity and is positioned above the air door, so that the condensed water above the air door is received and discharged.

15. The refrigerator as claimed in claim 14, wherein the cooling air duct is provided with an upper air duct outlet above the damper, the upper air duct outlet being in communication with the compartment;

the water baffle is arranged between the upper outlet of the air duct and the air door.

16. The refrigerator as claimed in claim 15, wherein the outlet of the air duct is offset from the damper.

17. The refrigerator as claimed in claim 13, wherein the air duct cavity has a mounting portion, the mounting portion is provided with a sliding groove in an arc shape, the sliding groove allows the air door to be slidably mounted, and a drainage groove is provided at a lower end of the sliding groove.

18. The refrigerator as claimed in claim 13, wherein the cooling air duct is provided in two, and the two cooling air ducts are located at both sides of the defrosting air duct;

the switching device comprises two air doors, and the two air doors are correspondingly arranged between the refrigerating air channel and the inlet of the defrosting air channel.

19. The refrigerator according to claim 3 or 4, further comprising an air duct cavity disposed between the compartment and the evaporation compartment;

the refrigeration air channel, the defrosting air channel and the fan shell are all arranged in the air channel cavity.

20. The refrigerator as claimed in claim 19, wherein the defrosting duct is integrally provided with a sidewall of the duct chamber; alternatively, the first and second electrodes may be,

the defrosting air channel is arranged in the air channel cavity.

21. The refrigerator as claimed in claim 1, wherein the outlet of the defrosting duct corresponds to a middle and both end regions in a length direction of the evaporator.

22. The refrigerator as claimed in claim 21, wherein the outlet of the defrosting air duct is provided in plurality to correspond to a middle area and both end areas of the evaporator in a length direction, respectively.

23. A defrosting control method of a refrigerator according to any one of claims 1 to 22, applied to a controller of the refrigerator, wherein the defrosting control method of the refrigerator comprises the steps of:

when a defrosting instruction is received, the switching device is controlled to switch to enable the defrosting air channel to be communicated with the evaporation bin, so that the internal circulation air channel is in a conducting state;

controlling the fan to be started;

acquiring relevant parameters related to the blockage of the internal circulation air duct;

judging whether the internal circulation air duct is blocked or not according to the related parameters;

and controlling the fan and the heater to work according to the judgment result.

24. The defrosting control method of a refrigerator as claimed in claim 23, wherein the step of controlling the operation of the blower fan and the heater according to the judgment result comprises:

if not, controlling the fan to be continuously started, and controlling the heater to be in a heating state; and/or the presence of a gas in the gas,

if yes, the fan is turned off, the heater is controlled to be heated to a first preheating condition, and then the step of controlling the fan to be turned on is returned.

25. The defrosting control method of a refrigerator as claimed in claim 24, wherein if not, after the step of controlling the fan to be continuously turned on and the heater to be in the heating state, the method comprises:

and when the preset defrosting completion condition is reached, controlling the heater to stop heating.

26. The defrosting control method of a refrigerator as claimed in claim 25, further comprising, after the step of controlling the heater to stop heating after a preset defrosting completion condition is reached:

and after the fan is controlled to continuously operate until the preset condition is met, the switching device is controlled to switch the defrosting air channel to be communicated with the evaporation bin.

Technical Field

The invention relates to the technical field of refrigeration equipment, in particular to a refrigerator and a defrosting control method thereof.

Background

The refrigerator usually includes compartment and evaporation storehouse, wherein, the compartment includes walk-in and freezer, still includes the temperature changing room in there being some refrigerators, be provided with the evaporimeter in the evaporation storehouse, the refrigerator still includes refrigeration wind channel usually, the refrigeration wind channel is used for with the air conditioning in the evaporation storehouse to the indoor transport of compartment, in addition, current refrigerator still includes the wind channel of defrosting, and in the process of defrosting, the wind channel of defrosting just constitutes confined inner loop wind channel with evaporation storehouse intercommunication, and heater and fan in the inner loop wind channel will work, then can produce obvious problem in the course of the work, mainly include the stability of noise and air current.

Disclosure of Invention

The invention mainly aims to provide a refrigerator and a defrosting control method thereof, and aims to solve the problems of poor airflow stability and high noise in a defrosting process.

To achieve the above object, the present invention provides a refrigerator including:

a compartment;

an evaporation bin in which an evaporator of a refrigeration system of the refrigerator is disposed;

the two ends of the defrosting air channel are correspondingly communicated with the evaporation bin to form an internal circulation air channel, and a heater and a fan are arranged in the internal circulation air channel;

one end of the refrigeration air channel is communicated with the compartment, and the other end of the refrigeration air channel is communicated with the evaporation bin to form an external circulation air channel;

the switching device is used for switching one of the defrosting air channel and the refrigerating air channel to be communicated with the evaporation bin; and the number of the first and second groups,

the controller is electrically connected with the refrigerating system, the switching device, the heater and the fan;

the refrigerator is provided with a defrosting mode, the air return port is in an open state in the defrosting mode, the controller is used for controlling the switching device to switch the defrosting air channel to be communicated with the evaporation bin, the fan and the heater are in a working state, and the refrigerating system stops working.

Optionally, the outlet of the defrosting air duct is located between the air return opening and the evaporator.

Optionally, the refrigerator further comprises a fan housing, the fan housing is provided with a fan air inlet and a fan air outlet, the fan is arranged in the fan housing, and the fan air inlet is communicated with the evaporation bin;

inlets of the defrosting air channel and the refrigerating air channel are connected with an air outlet of the fan;

and the switching device switches one of the inlets of the defrosting air channel and the refrigerating air channel to be communicated with the air outlet of the fan.

Optionally, the fan is a centrifugal fan, the fan air inlet is arranged at one end of the fan housing, and the fan air outlet is arranged at the peripheral side part of the fan housing;

the refrigeration air channel and the defrosting air channel extend outwards from the peripheral side of the fan shell.

Optionally, the refrigerated air duct comprises a first refrigerated air duct;

the switching device comprises a first door body and a first driving device, wherein the first door body is movably arranged at the inlets of the defrosting air channel and the first refrigerating air channel, and the first driving device drives the first door body to move.

Optionally, the defrosting air duct and the inlet of the first cooling air duct are arranged in an intersecting manner to be connected with an air outlet of the fan;

one end of the first door body is rotatably installed at the intersection of the defrosting air channel and the inlet of the first refrigerating air channel, and the inlets of the defrosting air channel and the inlet of the first refrigerating air channel are respectively closed and opened on the rotating stroke.

Optionally, an inlet of the first refrigeration air duct is communicated with the air outlet of the fan, and an inlet of the defrosting air duct is arranged on a side wall of the first refrigeration air duct;

the first door body is rotatably installed on the side wall of the first refrigeration air channel and located at the edge of the defrosting air channel.

Optionally, a first door frame for sealing and matching the first door body is integrally formed in the inlet of the defrosting air duct and/or the first refrigerating air duct.

Optionally, the first driving device includes a first driving motor, and a motor shaft of the first driving motor is connected to a rotating shaft of the first door body.

Optionally, the number of the refrigeration air ducts is multiple, the multiple refrigeration air ducts further include a second refrigeration air duct, and an inlet of the second refrigeration air duct is communicated with the fan air outlet;

the switching device comprises a second door body movably arranged in the second refrigerating air channel and a second driving device for driving the second door body to move.

Optionally, a second door frame is formed in the second refrigeration air duct, and the second door body is rotatably mounted at the second door frame; and/or the presence of a gas in the gas,

the second driving device comprises a second driving motor, and a motor shaft of the second driving motor is connected with a rotating shaft of the second door body.

Optionally, the refrigerator further has a partition cooling mode, and in the partition cooling mode, the controller controls the first driving device and the second driving device, so that the first cooling air duct is in an open state, the second cooling air duct is in a closed state, and the cooling system is in a working state.

Optionally, the switching device includes an air door arranged in an arc shape and slidably arranged at the periphery of the fan housing, and an air door driving device for driving the air door to slide, wherein the air door opens and closes the inlets of the refrigeration air duct and the defrosting air duct on the moving stroke of the air door.

Optionally, the refrigerator further comprises an air duct cavity disposed between the compartment and the evaporation bin;

the refrigerating air duct, the defrosting air duct and the fan shell are all arranged in the air duct cavity;

and a water baffle is arranged in the air duct cavity and is positioned above the air door, so that the condensed water above the air door is received and discharged.

Optionally, an upper air duct outlet is arranged above the air door of the refrigeration air duct, and the upper air duct outlet and the compartment are arranged;

the water baffle is arranged between the upper outlet of the air duct and the air door.

Optionally, the outlet on the air duct and the air door are arranged in a staggered manner.

Optionally, the installation department has in the wind channel cavity, the installation department is provided with the spout that is the arc setting, the spout supplies air door slidable mounting, just the lower extreme of spout is provided with water drainage tank.

Optionally, two refrigeration air ducts are provided, and the two refrigeration air ducts are located on two sides of the defrosting air duct;

the switching device comprises two air doors, and the two air doors are correspondingly arranged between the refrigerating air channel and the inlet of the defrosting air channel.

Optionally, the refrigerator further comprises an air duct cavity disposed between the compartment and the evaporation bin;

the refrigeration air channel, the defrosting air channel and the fan shell are all arranged in the air channel cavity.

Optionally, the defrosting air duct is integrally arranged with one side wall of the air duct cavity; alternatively, the first and second electrodes may be,

the defrosting air channel is arranged in the air channel cavity.

Optionally, the outlet of the defrosting air duct corresponds to the middle and two end areas of the evaporator in the length direction.

Optionally, the plurality of outlets of the defrosting air duct are provided to correspond to the middle area and the two end areas of the evaporator in the length direction respectively.

The invention also provides a defrosting control method of the refrigerator, which is applied to the controller of the refrigerator and comprises the following steps:

when a defrosting instruction is received, the switching device is controlled to switch to enable the defrosting air channel to be communicated with the evaporation bin, so that the internal circulation air channel is in a conducting state;

controlling the fan to be started;

acquiring relevant parameters related to the blockage of the internal circulation air duct;

judging whether the internal circulation air duct is blocked or not according to the related parameters;

and controlling the fan and the heater to work according to the judgment result.

Optionally, the step of controlling the operation of the fan and the heater according to the judgment result includes:

if not, controlling the fan to be continuously started, and controlling the heater to be in a heating state; and/or the presence of a gas in the gas,

if yes, the fan is turned off, the heater is controlled to be heated to a first preheating condition, and then the step of controlling the fan to be turned on is returned.

Optionally, if not, after the step of controlling the fan to continue to be turned on and controlling the heater to be in the heating state, the method includes:

and when the preset defrosting completion condition is reached, controlling the heater to stop heating.

Optionally, after the step of controlling the heater to stop heating after the preset defrosting completion condition is reached, the method further includes:

and after the fan is controlled to continuously operate until the preset condition is met, the switching device is controlled to switch the defrosting air channel to be communicated with the evaporation bin.

In the technical scheme of the invention, an air return opening is also arranged between a compartment and the evaporation bin, an outlet of a defrosting air channel is arranged close to the air return opening, when the refrigerator runs in a defrosting mode, because the fan is started, the air flow in the internal circulation air channel moves and the pressure of the air flow is reduced, so that pressure difference exists between the internal circulation air channel and the compartment, if the air return opening is kept closed, the stability of the air flow in the internal circulation air channel is poor due to the pressure difference existing between the internal circulation air channel and the compartment, therefore, the outlet of the defrosting air channel is arranged close to the air return opening, the air return opening is in an opened state, and in an initial defrosting stage, a part of air flow enters the evaporation air channel from the compartment and is converged with the air flow at the outlet of the defrosting air channel, until the air flow of the internal circulation air duct is stable.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a front side view of a refrigerator according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of an air duct assembly of the refrigerator of FIG. 1;

FIG. 3 is a schematic perspective view of the first door body assembly of FIG. 2;

FIG. 4 is a schematic perspective view of the second door body assembly of FIG. 2;

fig. 5 is a schematic perspective view of a partial structure of a refrigerator according to still another embodiment of the present invention;

FIG. 6 is a partial schematic view of FIG. 5;

FIG. 7 is a schematic view of the damper and damper drive of FIG. 5;

FIG. 8 is another schematic view of FIG. 5;

FIG. 9 is a schematic plan view of FIG. 8;

fig. 10 is a schematic flowchart illustrating a defrosting control method for a refrigerator according to an embodiment of the present invention;

fig. 11 is a flowchart illustrating a defrosting control method for a refrigerator according to another embodiment of the present invention.

The embodiment of the invention is illustrated by reference numerals:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Refrigerator with a door	5321	Electric machine
1	Compartment	5322	Driving gear
				11	Return air inlet	5323	Arc rackStructure of the product
2	Evaporation bin	6	Evaporator with a heat exchanger
				3	Defrosting air duct	7	Heating device
4	Refrigerating air duct	81	Fan blower
				5	Switching device	82	Fan shell
511	First door body	83	Fan inlet
				512	First driving device	84	Blower outlet
513	First door frame	9	Air duct cavity
				521	Second door body	9a	Upper outlet of air duct
522	Second driving device	91	Water baffle
				523	Second door frame	92	Mounting part
531	Air door	93	Sliding chute
				532	Air door driving device	94	Drainage channel

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Fig. 1 to 4 illustrate an embodiment of a refrigerator provided by the present invention, and fig. 5 to 9 illustrate another embodiment of the refrigerator provided by the present invention.

Referring to fig. 1 to 4, the refrigerator 100 includes a compartment 1, an evaporation bin 2, a defrosting air duct 3, a cooling air duct 4, a switching device 5, and a controller (not shown).

The compartment 1 includes a refrigerating chamber and a freezing chamber, and some refrigerators 100 further include a temperature-variable chamber, and generally, the refrigerating chamber, the temperature-variable chamber, and the freezing chamber are sequentially distributed from top to bottom, and are hereinafter collectively referred to as the compartment 1.

The evaporation chamber 2 is generally disposed behind the compartment 1, i.e. between the inner container of the refrigerator 100 and the back panel of the refrigerator 100, and obviously, the design is not limited thereto, and in some embodiments, it is not excluded that the evaporation chamber 2 may be disposed on the left and right sides of the compartment 1. An evaporator 6 is arranged in the evaporation bin 2, so that air in the evaporation bin 2 is cooled through the evaporator 6, and then the cooled air is conveyed to the compartment 1, so that the compartment 1 is cooled and food materials in the compartment 1 are cooled.

Two ends of the defrosting air duct 3 are correspondingly communicated with the evaporation bin 2 to form an internal circulation air duct, a heater 7 and a fan 81 are arranged in the internal circulation air duct (the fan 81 is unique to the internal loop air duct, can be common to other air ducts, and is described later), the refrigerator 100 has a defrosting mode, and the internal circulation air duct is in a communicated state in the defrosting mode.

One end of the refrigeration air duct 4 is communicated with the compartment 1 (an opening communicated between the refrigeration air duct 4 and the compartment 4 is generally called an air outlet), and the other end is communicated with the evaporation bin 2 to form an external circulation air duct, the refrigerator 100 further has a refrigeration mode, in the refrigeration mode, the external circulation air duct is in a communicated state, and after the refrigeration mode is operated for a period of time, the evaporator 6 in the evaporation bin 2 is generally frosted, and then the defrosting mode needs to be started to defrost the evaporator 6.

The switching device 5 switches one of the defrosting air duct 3 and the refrigerating air duct 4 to communicate with the evaporation bin 2, and the switching device 5 may be a switch door, a sealing element, or the like, which is arranged at the defrosting air duct 3 and the refrigerating air duct 4, and may be one or more, and the detailed description is provided in the subsequent sections.

The controller is electrically connected to the refrigeration system (including a compressor, etc.), the switching device 5, the heater 7, and the fan 81, so as to control the refrigeration system, the switching device 5, the heater 7, and the fan 81 to operate respectively.

In addition, in the present invention, an air return opening 11 is further disposed between the compartment 1 and the evaporation bin 2, an outlet of the defrosting air duct 3 is disposed adjacent to the air return opening 11, the air return opening 11 is configured to enable a return air flow to be formed between the compartment 1 and the evaporation bin 2 when the refrigerator 100 is in a cooling mode, and in addition, in the present invention, the refrigerator 100 has a defrosting mode, in which the air return opening 11 is in an open state, the controller is configured to control the switching device 5 to switch the defrosting air duct 3 to be communicated with the evaporation bin 2, the fan 81 and the heater 7 are in a working state, and the cooling system stops working.

In the technical scheme of the invention, an air return opening 11 is further arranged between a compartment 1 and an evaporation bin 2, an outlet of a defrosting air channel 3 is arranged adjacent to the air return opening 11, when the refrigerator 100 is in a defrosting mode, because the fan 81 is started, air flow in the internal circulation air channel moves and the pressure of the air flow is reduced, so that pressure difference exists between the internal circulation air channel and the compartment 1, if the air return opening 11 is kept closed, the stability of the air flow in the internal circulation air channel is poor due to the pressure difference existing between the internal circulation air channel and the compartment 1, therefore, the air return opening 11 is arranged adjacent to the air return opening 11 through the outlet of the defrosting air channel 3, and the air return opening 11 is in an opened state, and in an initial defrosting stage, a part of the air flow in the air return opening 11 enters the evaporation bin 2 from the compartment 1, and the airflow is converged with the airflow at the outlet of the defrosting air duct 3 until the airflow of the internal circulation air duct is stable.

In the embodiment of the present invention, the outlet of the defrosting air duct 3 is located between the air return opening 11 and the evaporator 6, so that on one hand, the air flow at the outlet of the defrosting air duct 3 is favorably merged with the air flow at the air return opening 11, and on the other hand, the air flow at the outlet of the defrosting air duct 3 passes through the evaporator 6, so as to better defrost the evaporator 6.

In the embodiment of the present invention, in the defrosting mode, in order to enable each area of the evaporator 6 to blow hot air, the outlets of the defrosting air ducts 3 correspond to the middle area and the two end areas of the evaporator 6 in the length direction, and further, a plurality of outlets of the defrosting air ducts 3 are provided to respectively correspond to the middle area and the two end areas of the evaporator 6 in the length direction, so that hot air blowing defrosting is performed by corresponding different outlets of the defrosting air ducts 3 to different areas of the evaporator 6.

As can be seen from the foregoing, one fan 81 may be provided, and the defrosting air duct 3 and the cooling air duct 4 share the fan 81, or a plurality of fans may be provided, so as to provide one fan 81 at each of the defrosting air duct 3 and the cooling air duct 4, in an embodiment of the present invention, the defrosting air duct 3 and the cooling air duct 4 share the fan 81, specifically, the refrigerator 100 further includes a fan housing 82, the fan housing 82 is provided with a fan 81 air inlet and a fan 81 air outlet, the fan 81 is provided in the fan housing 82, the fan 81 air inlet is communicated with the evaporation bin 2, the inlets of the defrosting air duct 3 and the cooling air duct 4 are connected with the fan 81 air outlet, the switching device 5 switches one of the inlets of the defrosting air duct 3 and the cooling air duct 4 to be communicated with the fan 81 air outlet, therefore, the refrigerating air duct 4 and the defrosting air duct 3 share one fan 81, and the structure is simpler.

In the embodiment of the present invention, the refrigerator 100 further includes an air duct cavity 9 disposed between the compartment 1 and the evaporator 6, and the refrigeration air duct 4, the defrosting air duct 3, and the fan housing 82 are disposed in the air duct cavity 9. Further, in the embodiment of the present invention, the defrosting air duct 3 is integrally disposed on a side wall of the air duct cavity 9, so that it is not necessary to additionally dispose the defrosting air duct 3, and obviously, in other embodiments of the present invention, the defrosting air duct 3 is installed in the air duct cavity 9.

Further, in the embodiment of the present invention, the fan 81 assembly is a centrifugal fan 81 assembly, the fan inlet 83 is disposed at one end of the fan housing 82, so that the fan housing 82 and the evaporation bin 2 can be disposed along the axial direction of the fan housing 82 to facilitate the arrangement of the fan 81 and the fan housing 82, the fan inlet 83 is disposed at the peripheral side of the fan housing 82, and the cooling air duct 4 and the defrosting air duct 3 extend outward from the peripheral side of the fan housing 82, so that the cooling air duct 4 and the defrosting air duct 3 can be conveniently arranged.

As described above, the switching device 5 may be the air door 531 and the switch, in an embodiment of the present invention, in a technical solution of the present invention, the switching device 5 includes the first door 511 movably disposed at the inlets of the defrosting air duct 3 and the first cooling air duct 4, and the first driving device 512 for driving the first door 511 to move, a specific movable installation manner of the first door 511 is not limited, and may be a sliding or a rotating manner, and a specific structure of the first driving device 512 is not limited, and may be the motor 5321 plus a transmission mechanism, or the oil cylinder and the air cylinder, etc.

Further, in the embodiment of the present invention, inlets of the defrosting air duct 3 and the first cooling air duct 4 are disposed in an intersecting manner to be connected to the fan air outlet 84, one end of the first door 511 is rotatably installed at an intersection of the inlets of the defrosting air duct 3 and the first cooling air duct 4, and the inlets of the defrosting air duct 3 and the first cooling air duct 4 are respectively closed and opened in a rotation stroke, so that the defrosting air duct 3 and the cooling air duct 4 can be opened and closed by the rotation of the first door 511, and the structure is simple and reliable.

The first driving device 512 drives the first door body 511 to rotate, where the first driving device 512 may include a motor and a transmission mechanism, so that the rotation of the first motor drives the first door body 511 to rotate through the transmission mechanism, or the motor directly drives the first door body 511 to rotate, specifically, in an embodiment of the present invention, the first driving device 512 includes a first driving motor, a motor shaft of the first driving motor is connected to a rotating shaft of the first door body 511, and the first driving motor may be, but is not limited to, a stepping motor.

Specifically, in the embodiment of the present invention, an inlet of the first cooling air duct 4 is communicated with the fan air outlet 84, an inlet of the defrosting air duct 3 is disposed on a side wall of the first cooling air duct 4, and the first door 511 is rotatably mounted on the side wall of the first cooling air duct 4 and located at an edge of the defrosting air duct 3, so that the inlets of the defrosting air duct 3 and the cooling air duct 4 are joined to each other, so as to be conveniently communicated with the fan air inlet 83 of the fan 81 assembly.

A first door frame 513 for sealing and matching the first door 511 is integrally formed at the inlet of the defrosting air duct 3 and/or in the first cooling air duct 4, specifically, in an embodiment of the present invention, a first door frame 513 is integrally formed at the inlet of the cooling air duct 4, when the first door 511 rotates toward the inlet of the cooling air duct 4, the first door 511 is disposed to cover the first door frame 513, so that the first door frame 513 is integrally disposed with the inlet of the cooling air duct 4 without additionally providing the first door frame 513, and the first door 511 is rotatably mounted to the first door frame 513, so that the mounting structure of the first door 511 can be simplified.

The defrosting air duct 3 and the refrigerating air duct 4 both have an annular matching surface for matching with the first door body 511, the annular matching surface is inclined upward and downward, specifically, when the refrigerating air duct 4 is provided with the first door frame 513, the first door frame 513 forms the annular matching surface of the refrigerating air duct 4, the annular matching surface of the defrosting air duct 3 is a peripheral surface of an inlet of the defrosting air duct 3, and the annular matching surface is inclined upward and downward to avoid condensed water gathering at the annular matching surface, so as to avoid the problem that the first door body 511 is bonded by frost.

In the embodiment of the present invention, the number of the cooling air ducts 4 is multiple, the multiple cooling air ducts 4 further include a second cooling air duct 4, an inlet of the second cooling air duct 4 is communicated with the fan air outlet 84, the switching device 5 includes a second door 521 rotatably disposed on the second cooling air duct 4, and a second driving device 522 for driving the second door 521 to move, the position of the second door 521 specifically disposed on the second cooling air duct 4 is not limited, and may be at the inlet of the second cooling air duct 4, or may be at another position of the second cooling air duct 4, as long as the second cooling air duct 4 can be closed and opened in a rotation stroke, the second driving device 522 drives the second door 521 to rotate, or the second driving device 522 includes a motor and a transmission mechanism, so that the rotation of the motor drives the second door 521 to rotate through the transmission mechanism, specifically, in the embodiment of the present invention, the second driving device 522 includes a second driving motor, a motor shaft of the second driving motor is connected to a rotating shaft of the second door 521, and the second driving motor may be, but is not limited to, a stepping motor.

Further, in the embodiment of the present invention, a second door frame 523 is formed in the second cooling air duct 4, the second door body 521 is rotatably mounted on the second door frame 523, and more specifically, the second door frame 523 and the air duct wall of the second cooling air duct 4 are integrally provided, so that the structure of the second door body 521 assembly can be simplified. And in order to prevent the second door body 521 from being adhered to the second door frame 523, the second door frame 523 is inclined downward to prevent condensed water from being collected.

Based on the condition that the number of the cooling air ducts 4 is multiple, in the embodiment of the present invention, the refrigerator 100 further has a partition cooling mode, and in the partition cooling mode, the controller controls the first driving device 512 and the second driving device 522, so that the first cooling air duct 4 is in an open state, the second cooling air duct 4 is in a closed state, and the cooling system is in a working state, specifically, the controller controls the second driving device 522 to drive the second door 521 to be in a closed state, and controls the first driving device 512 to drive the first door 511 to open the first cooling air duct 4, so that a partition corresponding to the first cooling air duct 4 is cooled.

In another embodiment of the present invention, referring to fig. 5 to 9, the switching device 5 includes an air door 531 disposed in an arc shape and slidably disposed on an outer periphery of the fan housing 82, and an air door driving device 532 for driving the air door 531 to slide, wherein the air door 531 opens and closes inlets of the cooling air duct 4 and the defrosting air duct 3 on a moving stroke thereof, so that the cooling air duct 4 and the defrosting air duct 3 are opened and closed by sliding of the air door 531.

In an embodiment of the present invention, the refrigerator 100 further comprises a duct chamber 9 disposed between the compartment 1 and the evaporator 6 compartment, the refrigerating air duct 4, the defrosting air duct 3 and the fan shell 82 are all arranged in the air duct cavity 9, a water baffle 91 is arranged in the air duct cavity 9, the water baffle 91 is positioned above the air door 531 and is used for carrying and discharging the condensed water above the air door 531, to prevent the condensed water located above the damper 531 from dropping on the damper 531, for example, condensate water is easily generated at the top wall of the air duct cavity 9, and the water baffle 91 can block the condensate water generated at the top wall of the air duct cavity 9 from dripping onto the air door 531, specifically, in the embodiment of the present invention, the water baffle 91 is gradually downward arranged from the middle portion to both sides, so as to guide the condensed water above the air door 531.

Further, in the embodiment of the present invention, the air duct is provided with an air duct upper outlet 9a above the air door 531, and the air duct upper outlet 9a is communicated with the compartment 1, so that during defrosting, because the air temperature in the compartment 1 is low and the air temperature in the air duct is high, condensed water is easily generated at this place, and therefore, in the embodiment of the present invention, the water blocking plate 91 is provided between the air duct upper outlet 9a and the air door 531.

Optionally, in an embodiment of the present invention, on the basis that the air duct upper outlet 9a is disposed above the air door 531, since the air duct upper outlet 9a is communicated with the compartment 1, and condensed water is easily generated at this position, the air duct upper outlet 9a and the air door 531 may be disposed in a staggered manner, so that the condensed water at the air duct upper outlet 9a does not drop onto the air door 531.

The air door 531 is slidably disposed, and how to slide is not limited, in an embodiment of the present invention, an installation portion 92 is disposed in the air duct cavity 9, the installation portion 92 is provided with a sliding groove 93 disposed in an arc shape, the sliding groove 93 is used for slidably installing the air door 531, and a drainage groove 94 is disposed at a lower end of the sliding groove 93, and the installation portion 92 may be a part of the air duct cavity 9, as in an embodiment of the present invention, the installation portion 92 is an inner side wall of the air duct cavity 9, obviously, the installation portion 92 may also be additionally disposed in the air duct cavity 9, so that no limitation is imposed here, this embodiment mainly aims at the sliding installation of the air door 531, and the sliding groove 93 for slidably installing the air door 531 is disposed in the air duct cavity 9, for this reason, water of the air door 531 may slide into the sliding groove 93, and once accumulated water therein is frozen, since the chute 93 is bonded to the damper 531, the drain groove 94 is provided to drain the water in the chute 93.

In the embodiment of the present invention, the two cooling air ducts 4 are provided, the two cooling air ducts 4 are located at two sides of the defrosting air duct 3, the switching device 5 includes two air doors 531, the two air doors 531 are correspondingly provided between the two cooling air ducts 4 and the inlet of the defrosting air duct 3, that is, one of the air doors 531 slides between the inlet of one cooling air duct 4 and the inlet of the defrosting air duct 3, the other air door 531 slides between the inlet of the other cooling air duct 4 and the inlet of the defrosting air duct 3 to open and close the inlets of the two cooling air ducts 4 and the inlet of the defrosting air duct 3, the two mounting portions 92 are provided, and are provided inside and outside along the periphery of the fan housing 82, so that the movement interference of the air doors 531 of the two air door 531 assemblies during the sliding process can be avoided, each of the mounting portions 92 is provided with one of the sliding grooves 93, and the lower end of each of the sliding grooves 93 is provided with the drain groove 94.

The specific structure of the damper driving device 532 is not limited, and further, in the embodiment of the present invention, the damper driving device 532 includes a motor 5321, a driving gear 5322 and an arc-shaped rack structure 5323, wherein the driving gear 5322 is in driving connection with the motor 5321, may be coaxially arranged, and may also be in driving connection through an intermediate transmission connecting member, the driving gear 5322 is engaged with the arc-shaped rack structure 5323, and the arc-shaped rack structure 5323 is disposed on the damper 531.

When the compartment 1 needs to be refrigerated, the two air doors 531 are both moved to the inlets of the defrosting air ducts 3 to close the inlets of the defrosting air ducts 3, and at this time, the inlets of the two refrigerating air ducts 4 are opened, the cool air in the evaporation bin 2 enters the compartment 1 from the two refrigerating air ducts 4 under the driving of the fan 81, when the evaporator 6 needs to be defrosted, the two air doors 531 slide to correspondingly close the inlets of the two refrigerating air ducts 4 and open the inlet of the defrosting air duct 3, at this time, the evaporation bin 2 and the defrosting air duct 3 form an internal circulation air duct, and at this time, the evaporator 6 is closed, the heater 7 is opened, the heater 7 heats the air in the internal circulation air duct, so that the heated air flows in the internal circulation air duct under the action of the fan 81, to defrost the evaporator 6.

The invention provides a defrosting control method of a refrigerator. Fig. 10 is a schematic flowchart of an embodiment of a defrosting control method of a refrigerator according to the present invention, and fig. 11 is a schematic flowchart of another embodiment of the defrosting control method of the refrigerator according to the present invention.

Based on the above refrigerator, in an embodiment of the present invention, as shown in fig. 10, the method for controlling defrosting of a refrigerator includes:

step S10, when a defrosting command is received, controlling the switching device 5 to switch so that the defrosting air duct 3 is communicated with the evaporation bin 2, so that the internal circulation air duct is in a conducting state, and correspondingly, the refrigeration air duct 4 is disconnected from the evaporation bin 2 at this time, that is, the external circulation air duct is in a closed state;

step S20, controlling the fan 81 to be started;

step S30, acquiring relevant parameters related to the blockage of the internal circulation air duct;

step S40, judging whether the internal circulation air duct is blocked or not according to the relevant parameters;

and step S50, controlling the fan 81 and the heater 7 to work according to the judgment result.

In the technical solution of the present invention, the defrosting control method of the refrigerator 100 includes: when a defrosting instruction is received, the switching device 5 is controlled to switch to enable the defrosting air channel 3 to be communicated with the evaporation bin 2, so that the internal circulation air channel is in a conduction state, and the fan 81 is controlled to be started; acquiring relevant parameters related to the blockage of the internal circulation air duct; judging whether the internal circulation air duct is blocked or not according to the related parameters; and controlling the fan 81 and the heater 7 to work according to the judgment result so as to control the fan 81 and the heater 7 to work in different modes when the internal circulation air duct is blocked and when the internal circulation air duct is not blocked, thereby avoiding influencing defrosting due to the blockage of the internal circulation air duct.

In an embodiment of the present invention, as shown in fig. 11, it is different from the embodiment of fig. 10 in that: step S50 includes;

step S51, if not, controlling the fan 81 to continue to be turned on, and controlling the heater 7 to be in a heating state, that is, when the internal circulation air duct is not blocked, defrosting can be performed normally, that is, the fan 81 can be controlled to continue to be turned on, and the heater 7 is kept in the on state (that is, when the heater 7 is originally in the on state, only the heater 7 needs to be controlled to keep the heating state, and if the heater 7 is in the off state, the heater 7 needs to be controlled to be turned on), at this time, hot air in the internal circulation air duct circularly flows in the internal circulation air duct, so as to defrost the evaporator 6; and/or the presence of a gas in the gas,

step S52, if yes, turning off the fan 81, controlling the heater 7 to heat to the first preheating condition, and returning to step S20; that is, when the internal circulation air duct is in the blocked state, the fan 81 needs to be turned off first, and the heater 7 is controlled to be in the heating state, so as to satisfy a first preheating condition, where the first preheating condition may be a set time, or a set temperature of the internal circulation air duct or the evaporator 6, and of course, the first preheating condition may also be other conditions, and for this reason, the first preheating condition is not limited, and when the first preheating condition is satisfied, the operation may be returned to step S20, so as to control the fan 81 to start again, specifically in an embodiment of the present invention, as shown in fig. 8, the first preheating condition is a set time, and specifically is 3-10 min.

In an embodiment of the present invention, step S51 is followed by:

step 60, controlling the heater 7 to stop heating when a preset defrosting completion condition is reached; the preset defrosting completion condition may be a temperature in the internal circulation air duct, a temperature of the evaporator 6, or an on-time of the heater 7, so that, without limitation, specifically, in an embodiment of the present invention, as shown in fig. 8, the preset defrosting completion condition is a temperature of the evaporator 6, and may be detected by a temperature sensor disposed at the evaporator 6.

In an embodiment of the present invention, after step 60, the method further comprises:

step 70, controlling the fan 81 to continuously operate until a preset condition is met, and then controlling the switching device 5 to switch the defrosting air channel 3 to be communicated with the evaporation bin 2;

the preset condition is not limited, and may be preset time, or may be other time, and when the blowing completion condition is reached, the air door 531 is controlled to close the inlet of the defrosting air duct 3, and the fan 81 is controlled to be turned off.

In an embodiment of the present invention, after the step S10 and before the step S20, the defrosting control method of the refrigerator 100 includes:

step S10a, controlling the heater 7 to start heating; that is, before the blower 81 is turned on, the heater 7 is turned on to preheat the evaporator 6 in which frost is formed.

Accordingly, step S20 includes: after the heater 7 is turned on to heat to a second preheating condition, the fan 81 is controlled to be turned on, the second preheating condition is not limited specifically, and may be an operating time of the heater 7, or a temperature in the internal circulation air duct or a temperature at the evaporator 6, in a specific embodiment of the present invention, the second preheating condition is a heating time of the heater 7, and is specifically 3-10 min.

The relevant parameters are parameters related to the blockage of the internal circulation air duct, and include the current and the rotating speed of the fan 81, the airflow size of the internal circulation air duct, and the like, and in an embodiment of the present invention, the relevant parameters include the rotating speed of the fan 81;

step S40 includes:

step S41, when the rotating speed of the fan 81 is lower than a set speed, judging that the internal circulation air duct is blocked;

and step S42, when the rotating speed of the fan 81 reaches the set speed, judging that the internal circulation air duct is not blocked.

Under normal conditions, under the circumstances that the internal circulation wind channel does not take place to block up, after fan 81 operates stably, its rotational speed can reach the set speed, if the internal circulation wind channel takes place to block up, then, fan 81 just gets bigger at the air resistance that rotates the in-process and just its rotational speed can not reach the set speed, so, can pass through whether the rotational speed of fan 81 judges the internal circulation wind channel takes place to block up.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.