CN115406152A - Refrigerator and defrosting control method - Google Patents

Abstract

The invention relates to the technical field of refrigerators, and particularly discloses a refrigerator and a defrosting control method. The refrigeration system comprises a compressor, a condenser, a drying filter, a first electronic expansion valve, a second electronic expansion valve, a first evaporator and a second evaporator which are connected in parallel. The exhaust pipe of the compressor is connected with the air inlet of the condenser, the air outlet of the condenser is connected with the inlet of the drying filter, two branches are connected in parallel between the outlet of the drying filter and the air return pipe of the compressor, and the branches are sequentially connected in series with the electronic expansion valve and the evaporator. When the evaporator alternately defrosts, the electronic expansion valve of the branch where the defrosting evaporator is located is closed, meanwhile, the corresponding air door is closed, and the corresponding air return channel is closed under the action of the air door, so that the defrosting evaporator is located in the small independent closed cavity. The invention not only realizes the constant indoor temperature of the storage room of the refrigerator during defrosting, but also can reduce the energy consumption of the refrigerator and shorten the defrosting period.

Description

Refrigerator and defrosting control method

Technical Field

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

Background

In the prior art, frost condensed on an evaporator of an air-cooled refrigerator is usually removed by means of thermal evaporation. Generally, after the refrigerator is operated for a period of time, the refrigerator stops cooling, and simultaneously, a defrosting heating system is started to heat the evaporator. The frost condensed on the evaporator is heated and changed into water, and the frost water is discharged through a special conduit. The defrosting process is automatically completed by the refrigerator, and the user does not need to manually defrost, so the industry also visually refers to the air-cooled refrigerator as an automatic defrosting refrigerator.

With the improvement of living standard and quality of people, people have more and more demands on large-volume refrigerators. This places higher demands on the evaporator of large volume air-cooled refrigerators. The evaporator is required to be larger and larger, the working efficiency is higher and higher, and the refrigeration effect of the evaporator is better and better. When the evaporator meets the above requirements, more frost is condensed on the surface of the evaporator, so that defrosting of the air-cooled refrigerator is a problem that the refrigerating condition of the refrigerator is directly affected, and people pay more attention to the defrosting.

At present, when the air-cooled refrigerator is defrosted, the refrigerator is heated by a heating wire, so that the defrosting stop time is about 30 minutes to 1 hour, and the refrigerator cannot refrigerate at the stage, so that the temperature fluctuation in a storage room is large.

Disclosure of Invention

The invention aims to provide a refrigerator, which effectively solves the problem that the temperature fluctuation in a storage room is large because the refrigerator cannot refrigerate when an air-cooled refrigerator defrosts.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the utility model provides a refrigerator, includes box, controller and refrigerating system, have cold-stored room in the box and be located the freezing room of cold-stored room below, refrigerating system includes compressor, condenser, and parallelly connected first evaporimeter and second evaporimeter, refrigerating system still includes drier-filter, first electronic expansion valve and second electronic expansion valve.

The exhaust pipe of the compressor is connected with the air inlet of the condenser, the air outlet of the condenser is connected with the inlet of the drying filter, two branches are connected in parallel between the outlet of the drying filter and the air return pipe of the compressor, the first branch is sequentially connected with the first electronic expansion valve and the first evaporator in series, and the second branch is sequentially connected with the second electronic expansion valve and the second evaporator in series.

When the two evaporators defrost alternately, the electronic expansion valve of the branch where the evaporator to be defrosted is located is closed, and meanwhile, the evaporator of the other branch normally carries out refrigeration cycle.

When the two evaporators refrigerate normally, the first electronic expansion valve and the second electronic expansion valve are both opened, and the two branches perform refrigeration circulation at the same time.

Furthermore, a freezing air channel assembly is arranged on the back of the freezing chamber, and a first freezing air return channel and a second freezing air return channel are arranged in the freezing air channel assembly.

Freezing wind channel subassembly includes the front shroud, is located the back shroud of front shroud rear side, is located the fan between front shroud and the back shroud, is located freezing wind channel foam, first air door, second air door of back shroud below, is used for controlling the first freezing return air passageway deep bead that first freezing return air passageway opened and shut and is used for controlling the freezing return air passageway deep bead of second that the freezing return air passageway of second opened and shut.

Freezing wind channel foam includes antetheca, roof and well next door, the next door will freeze the wind channel foam and separate for the first evaporator cavity that is used for setting up first evaporimeter and the second evaporator cavity that is used for setting up the second evaporimeter, first evaporator cavity top is equipped with the first opening that opens and shuts by first air door control, second evaporator cavity top is equipped with the second opening that opens and shuts by second air door control.

A fan cavity is arranged above the first air door and the second air door and is respectively communicated with the first evaporator cavity and the second evaporator cavity through the first opening and the second opening.

The upper end of the first freezing return air channel wind screen and the upper end of the second freezing return air channel wind screen are connected with a freezing air channel rear cover plate through a plurality of wind screen telescopic springs, the first freezing return air channel wind screen is inserted into the front wall of the first evaporator cavity, and the second freezing return air channel wind screen is inserted into the front wall of the second evaporator cavity.

When the air door is opened, the air baffle expansion springs on the same side of the air door pull the corresponding air baffles of the freezing air return channel to open the corresponding freezing air return channel.

When the air door is closed, the wind shields of the freezing return air channels on the same side of the air door are pressed, and the corresponding freezing return air channels are closed.

Furthermore, the back of the box body is provided with a first refrigerated return air pipeline and a second refrigerated return air pipeline, a first refrigerated return air channel air blocking assembly used for controlling the opening and closing of the first refrigerated return air pipeline and a second refrigerated return air channel air blocking assembly used for controlling the opening and closing of the second refrigerated return air pipeline are arranged in the fan cavity, and the first refrigerated return air channel air blocking assembly and the second refrigerated return air channel air blocking assembly respectively comprise an assembly base, two assembly springs, an assembly shell and an assembly telescopic baffle.

The assembly spring support is characterized in that the assembly base is in plug connection with the assembly shell, the two sides of the assembly base are respectively provided with an accommodating cavity for accommodating the assembly spring, the two sides of the assembly telescopic baffle are respectively fixed with telescopic rods, the free end of each telescopic rod is connected with one end of the assembly spring, the other end of each assembly spring is connected with the middle of the corresponding accommodating cavity, and a sliding cavity for the assembly telescopic baffle to freely move in a telescopic mode is arranged in the assembly shell.

Through the tip and the subassembly spring coupling with the telescopic link, subassembly base, subassembly shell and subassembly retractable baffle link into an integrated entity, and the holding chamber, telescopic link and the subassembly spring that are located the homonymy this moment are in same horizontal axis.

Furthermore, the component base and the component shell are equal in width and height, the component base and the component shell are connected along the length direction of the component base, the width of the component telescopic baffle is smaller than that of the component shell, and the height of the component telescopic baffle is smaller than that of the component shell.

Furthermore, be equipped with the vent on the flexible baffle of subassembly, when the air door was opened, the air door contact extruded the flexible baffle of subassembly, the vent link up with cold-stored return air pipeline, and when the air door was closed, the flexible baffle of subassembly extended under the effect of subassembly spring, the part outside the vent will be cold-stored return air pipeline and seal.

Furthermore, temperature sensors are arranged at the positions, close to the first air door, in the first evaporator cavity, close to the second air door and in the second evaporator cavity, and the position, close to the fan, in the fan cavity, and are connected with the controller.

The invention also aims to provide a defrosting control method, which effectively solves the problem that the air-cooled refrigerator cannot refrigerate during defrosting, so that the temperature fluctuation in the storage room is large.

A defrosting control method applied to the refrigerator of the above embodiment, wherein the first evaporator and the second evaporator alternately defrost, comprising the following steps:

s1, when a first evaporator is defrosted, a second evaporator is normally refrigerated, at the moment, a first electronic expansion valve is closed, and a second electronic expansion valve is normally opened;

s2, the first air door is gradually closed, the second air door is normally opened, the first refrigerated return air channel air blocking component gradually extends under the action of a component spring by a component telescopic baffle of the first refrigerated return air channel air blocking component, and the first refrigerated return air pipeline is completely closed by the part outside an air vent on the component telescopic baffle; simultaneously, at first air door closed process, after first air door rotation certain angle, first air door contact extrusion first freezing return air passageway deep bead, when first air door closed back completely, first freezing return air passageway is closed completely.

S3, after defrosting of the first evaporator is finished, opening the first electronic expansion valve, normally refrigerating the first evaporator, and still closing the first air door;

s4, when the temperature in the first evaporator cavity is the same as the temperature in the fan cavity, the first air door is opened;

s5, when the first air door is opened, the first air door contacts and extrudes a component telescopic baffle of the air blocking port component of the first refrigerating return air channel, the component telescopic baffle compresses a component spring while being pressed, and a ventilation opening in the component telescopic baffle is communicated with the first refrigerating return air pipeline; meanwhile, the first freezing return air channel is opened under the action of the tension of the wind shield telescopic spring by the wind shield of the first freezing return air channel;

s6, after the first air door is opened, the second evaporator starts defrosting, the steps S1-S5 are repeated, and the corresponding steps S1-S5 are replaced by the steps of 'first' and 'second'.

The beneficial technical effects of the invention are as follows:

(1) Through the design of the connection structure of the refrigerating system, the refrigerating system normally provides cold energy for the storage chamber of the refrigerator when the air-cooled refrigerator defrosts, and keeps the indoor temperature constant between the storage chambers.

(2) Through the design of the independent double air doors and the design of the freezing air duct assembly, the double evaporators are respectively arranged in the independent closed chambers, so that defrosting and refrigeration are isolated, the temperature constancy of the double evaporators in alternation between defrosting and storage chambers is realized, the defrosting efficiency is improved, and the energy consumption of the refrigerator is reduced.

(3) Through the air duct structural design, the movement of the cold storage air return channel air blocking component and the freezing air return channel wind shield is controlled in a linkage manner when the air door is opened and closed, the defrosting and refrigerating isolation is further ensured, and the constant temperature of the cold storage chamber and the freezing chamber is realized.

(4) And after the defrosting is finished, opening the air door when the temperature of the evaporator chamber is the same as that of the fan chamber. The defrosting control method further ensures the temperature of the refrigerating chamber and the freezing chamber to be constant.

Drawings

The invention is described in detail below with reference to the drawings and the detailed description.

FIG. 1 is a schematic diagram of a refrigeration system of the present invention.

Figure 2 is an exploded view of the refrigerated air duct assembly of the present invention.

Fig. 3 is a schematic view of the combined structure of fig. 2.

Fig. 4 is a schematic view of the position structure of the parallel double evaporators of the present invention.

Fig. 5 is a schematic cross-sectional view of the refrigerated return air duct of the present invention in an open condition.

Fig. 6 is a schematic sectional view of the refrigerated return air duct of the present invention in an off condition.

Fig. 7 is an exploded view of the refrigerated return air duct plugging assembly of the present invention.

Fig. 8 is a schematic view of the combined structure of fig. 7.

Fig. 9 is a schematic cross-sectional view of the open state of the refrigeration return air duct of the present invention.

Figure 10 is a schematic cross-sectional view of the refrigerated return duct of the present invention in a closed position.

Fig. 11 is a schematic diagram of air outlet and return during refrigeration by the dual evaporator of the present invention (in the figure, the dotted arrow indicates the flow direction of the outlet air, and the solid arrow indicates the flow direction of the return air).

Fig. 12 is a schematic view of the air outlet and return of the single evaporator of the present invention during cooling (in the figure, the dotted arrows indicate the flow direction of the air outlet, and the solid arrows indicate the flow direction of the return air).

Detailed Description

Example 1

A refrigerator comprises a box body, a controller and a refrigerating system, wherein a refrigerating chamber and a freezing chamber below the refrigerating chamber are arranged in the box body, as shown in figures 1 and 4, the refrigerating system comprises a compressor 1, a condenser 2, a drying filter 3, a first electronic expansion valve 4, a second electronic expansion valve 5, and a first evaporator 6 and a second evaporator 7 which are connected in parallel.

The exhaust pipe of the compressor 1 is connected with the air inlet of the condenser 2, the air outlet of the condenser 2 is connected with the inlet of the drying filter 3, two branches are connected in parallel between the outlet of the drying filter 3 and the air return pipe of the compressor 1, the first branch is sequentially connected with the first electronic expansion valve 4 and the first evaporator 6 in series, and the second branch is sequentially connected with the second electronic expansion valve 5 and the second evaporator 7 in series.

When the two evaporators alternately defrost, the electronic expansion valve of the branch where the evaporator to be defrosted is located is closed, and meanwhile, the evaporator of the other branch normally carries out refrigeration cycle; when the two evaporators refrigerate normally, the first electronic expansion valve 4 and the second electronic expansion valve 5 are both opened, and the two branches perform refrigeration circulation at the same time.

Specifically, a freezing air channel assembly is arranged on the back of the freezing chamber, and a first freezing air return channel and a second freezing air return channel are arranged in the freezing air channel assembly.

As shown in fig. 2 and 3, the freezing air duct assembly includes a front cover plate 8, a rear cover plate 9 located at the rear side of the front cover plate 8, a fan 10 located between the front cover plate 8 and the rear cover plate 9, freezing air duct foam 11 located below the rear cover plate 9, a first air door 12, a second air door 13, a first freezing return air duct wind guard 14 for controlling the opening and closing of the first freezing return air duct, and a second freezing return air duct wind guard 15 for controlling the opening and closing of the second freezing return air duct.

Freezing wind channel foam 11 includes antetheca 111, roof 112 and well next door 113, the next door 113 separates freezing wind channel foam 11 for the first evaporator chamber 61 that is used for setting up first evaporator 6 and the second evaporator chamber 71 that is used for setting up second evaporator 7, first evaporator chamber 61 top is equipped with the first opening 121 that opens and shuts by first damper 12 control, second evaporator chamber 71 top is equipped with the second opening 131 that opens and shuts by second damper 13 control.

A fan chamber 101 is arranged above the first damper 12 and the second damper 13, and the fan chamber 101 is communicated with the first evaporator chamber 61 and the second evaporator chamber 71 through a first opening 121 and a second opening 131 respectively.

When the refrigeration is normally performed, the first damper 12 and the second damper 13 are both in a completely opened state, the opening angle is 90 degrees, at the moment, the cold energy of the first evaporator chamber 61 and the cold energy of the second evaporator chamber 71 can enter the fan chamber 101, and then the fan 10 is used for providing cold energy for the freezing chamber and the refrigerating chamber. The return air of the freezing compartment passes through the first freezing return air channel inlet and the second freezing return air channel inlet from the bottom of the rear cover plate 9 and enters the bottom of the first evaporator chamber 61 and the bottom of the second evaporator chamber 71 respectively. The return air of the refrigerating compartment firstly enters a first refrigerating return air channel inlet and a second refrigerating return air channel inlet, respectively enters the bottom of the first evaporator cavity 61 and the bottom of the second evaporator cavity 71 through a first refrigerating return air pipeline and a second refrigerating return air pipeline and then respectively enters the bottom of the first evaporator cavity and the bottom of the second evaporator cavity through a first refrigerating return air channel outlet and a second refrigerating return air channel outlet. Thereby creating a good wind circulation.

As shown in fig. 2 and 3, the upper end of the first refrigerated return air duct 14 and the upper end of the second refrigerated return air duct 15 are both connected to the rear cover 9 by a plurality of air-guard expansion springs 16, the first refrigerated return air duct 14 is inserted into the front wall of the first evaporator compartment 61, and the second refrigerated return air duct 15 is inserted into the front wall of the second evaporator compartment 71.

As shown in fig. 5, when the first or second air door is opened, the wind shield expansion spring on the same side of the first or second air door pulls the wind shield of the corresponding freezing return air channel to open the corresponding freezing return air channel; as shown in fig. 6, when the first or second air doors are closed, the freezing return air channel wind shields on the same side of the air doors are pressed to close the corresponding freezing return air channels.

As shown in fig. 11 and 12, the first and second refrigerated return air ducts are attached to the back of the cabinet. The fan cavity 101 is provided with a first refrigerated return air channel air blocking assembly 17 for controlling the opening and closing of a first refrigerated return air pipeline and a second refrigerated return air channel air blocking assembly 18 for controlling the opening and closing of a second refrigerated return air pipeline, as shown in fig. 7, the first refrigerated return air channel air blocking assembly 17 and the second refrigerated return air channel air blocking assembly 18 both comprise an assembly base 181, two assembly springs 182, an assembly shell 183 and an assembly telescopic baffle 184.

As shown in fig. 7 and 8, the assembly base 181 and the assembly housing 183 are connected in an inserting manner, two sides of the assembly base 181 are respectively provided with an accommodating cavity a for accommodating an assembly spring, two sides of the assembly retractable barrier 184 are respectively fixed with a retractable rod 185, a free end of the retractable rod 185 is connected with one end of the assembly spring 182, the other end of the assembly spring 182 is connected with the middle of the accommodating cavity a, and the assembly housing 183 is internally provided with a sliding cavity B for allowing the assembly retractable barrier 184 to freely move in a retractable manner.

The end of the telescopic rod 185 is connected with the assembly spring 182, so that the assembly base 181, the assembly housing 183 and the assembly telescopic baffle 184 are connected into a whole, and the accommodating cavity a, the telescopic rod 185 and the assembly spring 182 which are positioned on the same side are positioned on the same horizontal shaft.

Further, the component base 181 and the component housing 183 are equal in width and height. The module base 181 and the module housing 183 are connected along the length direction of the module base 181, the width of the module retractable barrier 184 is smaller than that of the module housing 183, and the height of the module retractable barrier 184 is smaller than that of the module housing 183.

The assembly retractable baffle 184 is provided with a ventilation opening 19, as shown in fig. 9, when the air door is opened, the air door contacts with the compression assembly retractable baffle 184, and the ventilation opening 19 is communicated with the refrigeration return air pipeline C. As shown in fig. 10, when the damper is closed, the module retractable flap 184 is extended by the module spring 182, and the portion other than the vent 19 closes the refrigerating return duct C.

Further, temperature sensors are arranged in the first evaporator chamber 61 close to the first damper 12, in the second evaporator chamber 71 close to the second damper 13 and in the fan chamber 101 close to the fan 10, and the temperature sensors are connected with the controller. When the defrosting of the evaporator is finished, the electronic expansion valve of the same branch of the evaporator is opened, the evaporator starts to refrigerate the evaporator chamber, and at the moment, whether the air door corresponding to the upper part of the evaporator chamber is opened or not is related to the temperature of the evaporator chamber and the temperature of the fan chamber. When the temperature in the evaporator chamber is the same as the temperature in the fan chamber, the damper is opened. Tests show that the temperature of the evaporator chamber is recovered within 10 minutes after defrosting is finished, and the air door is opened.

Example 2

A defrosting control method is applied to the refrigerator in embodiment 1. The first evaporator 6 and the second evaporator 7 alternately defrost, and the method comprises the following steps:

s1, when a first evaporator 6 is defrosted, a second evaporator 7 is normally refrigerated, at the moment, a first electronic expansion valve 4 is closed, and a second electronic expansion valve 5 is normally opened;

s2, gradually closing the first air door 12, normally opening the second air door 13, gradually extending the first refrigerated return air channel air blocking assembly 17 by an assembly telescopic baffle of the first refrigerated return air channel air blocking assembly 17 under the action of an assembly spring, and completely closing the first refrigerated return air pipeline by the part outside the vent 19 on the assembly telescopic baffle; meanwhile, in the closing process of the first air door 12, after the first air door 12 rotates for a certain angle, the first air door 12 contacts and extrudes the first freezing return air channel wind shield 14, and when the first air door 12 is completely closed, the first freezing return air channel is completely closed.

And S3, after defrosting of the first evaporator 6 is finished, the first electronic expansion valve 4 is opened, the first evaporator 6 is normally cooled, and the first air door 12 is still closed.

And S4, when the temperature in the first evaporator chamber 61 is the same as the temperature in the fan chamber 101, the first damper 12 is opened.

S5, when the first air door 12 is opened, the first air door 12 contacts and extrudes the assembly telescopic baffle of the first refrigerating return air channel air blocking component 17, the assembly telescopic baffle compresses the assembly spring while being pressed, and the ventilation opening 19 on the assembly telescopic baffle is communicated with the first refrigerating return air pipeline; meanwhile, the first freezing return air channel wind shield 14 is opened under the tension of the wind shield expansion spring.

S6, after the first air door 12 is opened, the second evaporator 7 starts defrosting, the steps S1 to S5 are repeated, and the corresponding steps S1 to S5 are replaced by the steps 'first' and 'second'. Specifically, the second electronic expansion valve 5 is closed, the second air door 13 is gradually closed, and the second refrigeration return air pipeline and the second freezing return air channel are also closed. When the second evaporator 7 finishes defrosting and starts cooling again, the second damper 13 is closed continuously, and when the temperature in the second evaporator chamber 71 is the same as the temperature in the fan chamber 101, the second damper 13 is opened.

The specific working principle of the invention is as follows:

TABLE 1 states of air door and return air channel corresponding to different working states of evaporator

As shown in table 1 and fig. 11, during normal refrigeration, the first air door 12 and the second air door 13 are both completely opened, and the cooling capacity of the first evaporator chamber and the cooling capacity of the second evaporator chamber can both enter the fan chamber 101, at this time, the first refrigerating return air pipeline, the second refrigerating return air pipeline, the first freezing return air channel and the second freezing return air channel are all communicated, and the cooling capacity is provided to the freezing chamber and the refrigerating chamber through the fan 10.

As shown in fig. 12, when the first evaporator 6 starts defrosting, the first refrigerating return air duct air blocking assembly 17 gradually extends in the process of gradually closing the first air door 12, and the first refrigerating return air duct is first closed in cooperation with the first refrigerating return air duct air blocking assembly 17. The first damper 12 then contacts the first refrigerated return air duct damper 14, and under the pressure of the first damper 12, the damper extension spring is forced to stretch and the first refrigerated return air duct is progressively closed, so that the first evaporator chamber 61 is fully enclosed.

At this time, the cooling capacity of the second evaporator chamber 71 can enter the fan chamber 101, and then the cooling capacity is supplied to the freezing chamber and the refrigerating chamber by the fan 10.

The return air of the cold storage compartment enters the inlet of the second cold storage return air channel firstly and then enters the second cold storage return air pipeline, and the first cold storage return air channel is closed, so that the return air can only pass through the second cold storage return air channel and block the air inlet component and return to the bottom of the cavity of the second evaporator.

The return air from the freezing compartment passes from the bottom of the back cover 9 through the second freezing return air channel inlet and into the bottom of the second evaporator chamber 71. Whereby the second evaporator 7 can also normally cool when the first evaporator 6 is defrosted.

When the first evaporator 6 finishes defrosting, the refrigeration is restarted. At this point, the first damper 12 will continue to close for a while, and when the temperature in the first evaporator chamber 61 returns to the same temperature as the blower chamber 101, the first damper 12 opens. After the first damper 12 is opened, the second evaporator chamber 71 begins defrosting, and the above steps are repeated.

The parts which are not described in the invention can be realized by adopting or referring to the prior art. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.

Claims (7)

1. A refrigerator comprises a box body, a controller and a refrigerating system, wherein a refrigerating chamber and a freezing chamber positioned below the refrigerating chamber are arranged in the box body;

the exhaust pipe of the compressor is connected with the air inlet of the condenser, the air outlet of the condenser is connected with the inlet of the dry filter, two branches are connected in parallel between the outlet of the dry filter and the air return pipe of the compressor, the first branch is sequentially connected in series with a first electronic expansion valve and a first evaporator, and the second branch is sequentially connected in series with a second electronic expansion valve and a second evaporator;

when the two evaporators alternately defrost, the electronic expansion valve of the branch where the evaporator to be defrosted is located is closed, and meanwhile, the evaporator of the other branch normally carries out refrigeration cycle;

when the two evaporators refrigerate normally, the first electronic expansion valve and the second electronic expansion valve are both opened, and the two branches perform refrigeration circulation at the same time.

2. The refrigerator of claim 1 wherein a freezing air duct assembly is disposed at a back of the freezing compartment, and a first freezing return air duct and a second freezing return air duct are disposed in the freezing air duct assembly;

the freezing air channel assembly comprises a front cover plate, a rear cover plate positioned on the rear side of the front cover plate, a fan positioned between the front cover plate and the rear cover plate, freezing air channel foam positioned below the rear cover plate, a first air door, a second air door, a first freezing air return channel wind shield used for controlling the opening and closing of the first freezing air return channel and a second freezing air return channel wind shield used for controlling the opening and closing of the second freezing air return channel;

the freezing air duct foam comprises a front wall, a top wall and a middle partition wall, the middle partition wall divides the freezing air duct foam into a first evaporator chamber for arranging a first evaporator and a second evaporator chamber for arranging a second evaporator, a first opening controlled to be opened and closed by a first air door is arranged above the first evaporator chamber, and a second opening controlled to be opened and closed by a second air door is arranged above the second evaporator chamber;

a fan chamber is arranged above the first air door and the second air door and is respectively communicated with the first evaporator chamber and the second evaporator chamber through the first opening and the second opening;

the upper end part of the first freezing return air channel wind screen and the upper end part of the second freezing return air channel wind screen are connected with the freezing air channel rear cover plate through a plurality of wind screen telescopic springs, the first freezing return air channel wind screen is inserted into the front wall of the first evaporator cavity, and the second freezing return air channel wind screen is inserted into the front wall of the second evaporator cavity;

when the air door is opened, the wind shield expansion springs on the same side of the air door pull the wind shields of the corresponding freezing return air channels to open the corresponding freezing return air channels;

when the air door is closed, the wind shields of the freezing return air channels on the same side of the air door are pressed, and the corresponding freezing return air channels are closed.

3. The refrigerator according to claim 2, wherein a first refrigerating return air pipeline and a second refrigerating return air pipeline are arranged at the back of the box body, a first refrigerating return air channel air blocking component for controlling the opening and closing of the first refrigerating return air pipeline and a second refrigerating return air channel air blocking component for controlling the opening and closing of the second refrigerating return air pipeline are arranged in the fan cavity, and each of the first refrigerating return air channel air blocking component and the second refrigerating return air channel air blocking component comprises a component base, two component springs, a component shell and a component telescopic baffle;

the assembly base and the assembly shell are connected in an inserted manner, two sides of the assembly base are respectively provided with an accommodating cavity for accommodating an assembly spring, two sides of the assembly telescopic baffle are respectively fixed with a telescopic rod, the free end of the telescopic rod is connected with one end of the assembly spring, the other end of the assembly spring is connected with the middle part of the accommodating cavity, and a sliding cavity for the assembly telescopic baffle to freely move in a telescopic manner is arranged in the assembly shell;

through the tip and the subassembly spring coupling with the telescopic link, subassembly base, subassembly shell and subassembly retractable barrier link into an integrated entity, and the holding chamber, telescopic link and the subassembly spring that are located the homonymy this moment are in same horizontal axis.

4. The refrigerator of claim 3, wherein the module base and the module housing are equal in width and height, the module base and the module housing are coupled along a length direction of the module base, the module retractable barrier has a width smaller than a width of the module housing, and the module retractable barrier has a height smaller than a height of the module housing.

5. The refrigerator as claimed in claim 4, wherein the assembly retractable baffle is provided with a vent, when the damper is opened, the damper contacts and presses the assembly retractable baffle, the vent is communicated with the refrigerating return air pipeline, when the damper is closed, the assembly retractable baffle extends under the action of the assembly spring, and the part outside the vent seals the refrigerating return air pipeline.

6. The refrigerator of claim 5 wherein temperature sensors are disposed in the first evaporator chamber adjacent the first damper, in the second evaporator chamber adjacent the second damper and in the blower chamber adjacent the blower, the temperature sensors being connected to the controller.

7. A defrosting control method applied to the refrigerator of claim 6, wherein the first evaporator and the second evaporator alternately defrost, comprising the steps of:

s1, when a first evaporator is defrosted, a second evaporator is normally refrigerated, at the moment, a first electronic expansion valve is closed, and a second electronic expansion valve is normally opened;

s2, the first air door is gradually closed, the second air door is normally opened, the first refrigerated return air channel air blocking component gradually extends under the action of a component spring by a component telescopic baffle of the first refrigerated return air channel air blocking component, and the first refrigerated return air pipeline is completely closed by the part outside an air vent on the component telescopic baffle; simultaneously, at first air door closed process, after first air door rotation certain angle, first air door contact extrusion first freezing return air passageway deep bead, when first air door closed back completely, first freezing return air passageway is closed completely.

S3, after defrosting of the first evaporator is finished, opening the first electronic expansion valve, normally refrigerating the first evaporator, and still closing the first air door;

s4, when the temperature in the first evaporator cavity is the same as the temperature in the fan cavity, the first air door is opened;

s5, when the first air door is opened, the first air door contacts and extrudes the assembly telescopic baffle of the air blocking port assembly of the first refrigeration return air channel, the assembly spring is compressed when the assembly telescopic baffle is pressed, and a vent on the assembly telescopic baffle is communicated with the first refrigeration return air pipeline; meanwhile, the first freezing air return channel is opened under the action of the tension of the wind shield expansion spring of the wind shield;

s6, after the first air door is opened, the second evaporator starts defrosting, the steps S1-S5 are repeated, and the corresponding steps S1-S5 are replaced by the steps of 'first' and 'second'.

Images