refrigerator

Abstract

The present invention relates to a refrigerator, comprising a back plate and a partition, wherein the partition is docked on the inner side of the back plate, and the back plate is divided into a first part and a second part, wherein the first part is used to form a freezing compartment, and the second part is used to form a variable temperature compartment, wherein a main air duct is provided in the first part, wherein the inlet of the main air duct can be communicated with the evaporator of the refrigerator, and the freezing outlet of the main air duct is communicated with the freezing compartment, wherein the position on the back plate docked with the partition is a docking portion, wherein the docking port of the main air duct is arranged in the docking portion, wherein a variable temperature air duct is provided in the partition, wherein a damper is arranged in the variable temperature air duct, wherein the inlet of the variable temperature air duct is communicated with the docking port, and the outlet of the variable temperature air duct is communicated with the variable temperature compartment. Since the variable temperature air duct is arranged in the partition, and the main air duct is communicated with the variable temperature air duct through the docking port, the volume ratio of the refrigerator is effectively improved.

Description

Technical Field

[0001] The invention relates to the field of household electrical appliances, in particular to a refrigerator. Background Art

[0002] In air-cooled refrigerators, cold air is mainly conducted to each compartment through air ducts to achieve the cooling effect. In this process, it is not easy to frost and the freezing is uniform, so air-cooled refrigerators are widely used. Now, in order to increase the practicality of refrigerators, it is necessary to set up variable temperature compartments to achieve the effect of food preservation and thawing. However, in general life, the storage space demand for the refrigeration compartment is large, so it is not convenient to expand the variable temperature compartment in the refrigeration compartment. However, the temperature in the freezer compartment is relatively low. If a variable temperature compartment is expanded next to the freezer compartment in a single refrigeration system refrigerator, it is easy to reduce the overall volume ratio of the refrigerator. Summary of the invention

[0003] Based on this, it is necessary to provide a refrigerator that ensures the overall volume ratio of the refrigerator when expanding a variable temperature compartment next to a freezer compartment.

[0004] A refrigerator comprises a back plate and a partition, wherein the partition is butted against the inner side of the back plate to divide the back plate into a first part and a second part, wherein the first part is used to form a freezing compartment, and the second part is used to form a variable temperature compartment, wherein a main air duct is arranged in the first part, wherein the inlet of the main air duct can be communicated with an evaporator of the refrigerator, and the freezing outlet of the main air duct is communicated with the freezing compartment, wherein the position on the back plate butted against the partition is a butting portion, and the butting port of the main air duct is arranged in the butting portion, wherein a variable temperature air duct is arranged in the partition, and a damper is arranged in the variable temperature air duct, wherein the inlet of the variable temperature air duct is communicated with the butting port, and the outlet of the variable temperature air duct is communicated with the variable temperature compartment.

[0005] The above scheme provides a refrigerator, based on the variable temperature compartment being arranged next to the freezing compartment, in order to achieve the purpose of temperature isolation between the two compartments, the thickness of the partition needs to reach a certain value. In this case, by arranging the variable temperature air duct in the partition, the space occupied by the partition is fully utilized, and the docking port is arranged at the docking portion of the back plate, so that the cold air in the total air duct can enter the variable temperature compartment on one side of the partition from the outlet of the variable temperature air duct after being adjusted by the damper, and the cold air in the total air duct can enter the freezing compartment on the other side of the side plate from the freezing outlet. Therefore, when the variable temperature compartment is arranged next to the freezing compartment, based on the variable temperature air duct being arranged in the partition, and the total air duct being connected with the variable temperature air duct through the docking port, the volume ratio of the refrigerator is effectively improved.

[0006] In one of the embodiments, the air door is arranged at the entrance of the variable temperature air duct.

[0007] In one of the embodiments, the partition includes a thermal insulation layer, and the variable temperature air duct is arranged in the thermal insulation layer.

[0008] In one embodiment, the partition further includes a freezing side plate and a temperature-changing side plate, the thermal insulation layer is stacked between the freezing side plate and the temperature-changing side plate, the freezing side plate is used to form the freezing compartment, and the temperature-changing side plate is used to form the temperature-changing compartment, a recess is provided on the side of the thermal insulation layer opposite to the temperature-changing side plate, which is used to form the temperature-changing air duct with the temperature-changing side plate, and the outlet of the temperature-changing air duct is provided on the temperature-changing side plate.

[0009] In one embodiment, the outlet of the variable temperature air duct is located above the inlet of the variable temperature air duct, and the variable temperature air duct includes a summary input section and an output section that are interconnected, and the summary input section and the output section are arranged at an angle, and a guide protrusion is provided on the bottom wall of the depression, and the guide protrusion is located at the junction of the summary input section and the output section.

[0010] In one embodiment, the summary input section is arranged along the transverse direction of the partition, the output section is arranged along the longitudinal direction of the partition, the variable temperature air duct has multiple outlets, and the outlets of the multiple variable temperature air ducts are arranged at intervals in the longitudinal direction of the partition, and each outlet of the variable temperature air duct is connected to the output section.

[0011] In one embodiment, the position where the output section is connected to the aggregate input section is an intersection, the portion of the output section located above the intersection is a first section, the portion of the output section located below the intersection is a second section, and the side of the guide protrusion facing the corner between the aggregate input section and the first section is an arc-shaped guide surface.

[0012] In one embodiment, the back plate includes an inner plate, an insulation layer and an outer plate stacked in sequence, the outer plate is provided with a groove for forming the main air duct with the inner plate, the inlet of the main air duct is arranged on the outer plate, the freezing outlet is arranged on the inner plate, and the docking port is arranged on the inner plate.

[0013] In one embodiment, a refrigerated return air inlet and a variable temperature return air inlet are provided on the inner panel, the refrigerated return air inlet is located on the first part, the variable temperature return air inlet is located on the second part, a return air groove is provided on the inner panel, and the refrigerated return air inlet and the variable temperature return air inlet are both connected to the return air groove.

[0014] In one embodiment, the heat insulation layer is a heat insulation sponge, and a fan is provided at the entrance of the main air duct.

[0015] In one embodiment, the refrigerator further includes a side panel frame, a refrigerated back panel and a middle partition, the refrigerated back panel is docked on top of the back panel to form a total back panel, the side panel frame is arranged along the edge of the total back panel, the middle partition is arranged at the position where the refrigerated back panel and the back panel are docked, a refrigerated compartment is formed above the middle partition, and the refrigerated outlet of the total air duct is connected to the refrigerated compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the refrigerator described in this embodiment;

[0017] Figure 2 for Figure 1 a cross-sectional view of the refrigerator shown;

[0018] Figure 3 for Figure 1 The schematic diagram of the structure of the partition in the refrigerator shown;

[0019] Figure 4 for Figure 3 An exploded view of the bulkhead shown;

[0020] Figure 5 for Figure 3 a cross-sectional view of the partition shown;

[0021] Figure 6 for Figure 1 The schematic diagram of the structure of the back plate in the refrigerator shown;

[0022] Figure 7 for Figure 6 A schematic diagram of the structure of the outer plate of the back plate shown;

[0023] Figure 8 for Figure 6 A schematic diagram of the structure of the inner plate in the back plate shown;

[0024] Fig. 9 for Figure 6 Schematic diagram of the structure of the thermal insulation layer in the back panel shown.

[0025] Description of reference numerals:

[0026] 10. Refrigerator; 11. Back panel; 111. First part; 1111. Main air duct; 112. Second part; 113. Inner panel; 1131. Freezer outlet; 1132. Docking port; 1133. Freezer return air outlet; 1134. Variable temperature return air outlet; 1135. Return air groove; 114. Insulation layer; 115. Outer panel; 1151. Groove; 12. Partition; 121. Variable temperature side panel; 12 2. Insulation layer; 1221. Depression; 123. Refrigeration side panel; 124. Variable temperature air duct; 1241. Summary input section; 1242. Output section; 13. Side panel frame; 14. Refrigeration back panel; 15. Middle partition; 16. Total back panel; 17. Air door; 18. Guide protrusion; 181. Arc-shaped guide surface; 19. Fan; 20. Refrigeration compartment; 30. Variable temperature compartment; 40. Refrigeration compartment. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The various technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] like Figure 1 As shown, in one embodiment, a refrigerator 10 is provided, comprising a back plate 11 and a partition plate 12. Figure 1 and Figure 2As shown, the partition 12 is butted against the inner side of the back plate 11, dividing the back plate 11 into a first part 111 and a second part 112, wherein the first part 111 is used to form a freezing chamber 20, and the second part 112 is used to form a variable temperature chamber 30. Generally speaking, the temperature of the freezing chamber 20 is lower than that of the variable temperature chamber 30. The partition 12 can isolate the temperature between the variable temperature chamber 30 and the freezing chamber 20, so that the temperatures in the two chambers can be controlled separately.

[0031] Specifically, the partition 12 may be provided with a heat-insulating layer 122 to improve the temperature isolation effect between the temperature-changing compartment 30 and the freezing compartment 20 .

[0032] Furthermore, if Figure 2 and Figure 6 As shown, the first part 111 is provided with a main air duct 1111, the inlet of the main air duct 1111 can be communicated with the evaporator of the refrigerator 10, and the freezing outlet 1131 of the main air duct 1111 is connected with the freezing chamber 20. Figure 2 , Figure 6 and Figure 8 As shown, the position on the back plate 11 that is connected to the partition plate 12 is the connection portion, and the connection port 1132 of the main air duct 1111 is arranged at the connection portion. Figure 2 , Figure 4 and Figure 5 As shown, a variable temperature air duct 124 is provided in the partition 12, and a damper 17 is provided in the variable temperature air duct 124. The inlet of the variable temperature air duct 124 is communicated with the docking port 1132, and the outlet of the variable temperature air duct 124 is communicated with the variable temperature chamber 30. By adjusting the size of the damper 17, the amount of cold air entering the variable temperature air duct 124 from the main air duct 1111 can be adjusted, so as to achieve the purpose of controlling the temperature of the variable temperature chamber 30.

[0033] That is, since the variable temperature compartment 30 is arranged next to the freezing compartment 20, the freezing compartment 20 has a lower temperature, in order to isolate the temperature between the two compartments, the thickness of the partition 12 needs to reach a certain value. By arranging the variable temperature air duct 124 in the partition 12 and arranging the docking port 1132 at the docking portion of the back plate 11, Figure 2As shown, the cold air in the main air duct 1111 can enter the variable temperature compartment 30 on one side of the partition 12 from the outlet of the variable temperature air duct 124 after being adjusted by the air door 17, and the cold air in the main air duct 1111 can enter the freezing compartment 20 on the other side of the partition 12 from the freezing outlet 1131. Therefore, when the variable temperature compartment 30 is arranged beside the freezing compartment 20, based on the variable temperature air duct 124 being arranged in the partition 12, it is not necessary to increase the thickness of the back plate 11 or other parts of the refrigerator 10 to arrange the variable temperature air duct 124, and the main air duct 1111 is connected with the variable temperature air duct 124 through the docking port 1132, and it is not necessary to increase the thickness of the pipeline to achieve the conduction between the main air duct 1111 and the variable temperature air duct 124, thereby effectively improving the volume ratio of the refrigerator 10 as a whole.

[0034] Specifically, in one embodiment, the damper 17 is disposed at the entrance of the variable temperature air duct 124. Thus, the air volume in the entire variable temperature air duct 124 is controlled by the damper 17, and the total air duct 1111 not controlled by the damper 17 does not extend into the second portion 112 forming the variable temperature chamber 30, further improving the accuracy of temperature control of the variable temperature chamber 30.

[0035] Further, in one embodiment, if Figure 2 , Figure 4 and Figure 5 As shown, when the partition 12 includes a heat-insulating layer 122, the variable temperature air duct 124 is disposed in the heat-insulating layer 122. The variable temperature air duct 124 can be disposed in the heat-insulating layer 122 on one side close to the variable temperature compartment 30, so as to achieve the wind guiding effect while ensuring the heat insulation effect of the heat-insulating layer 122 on the freezing compartment 20 and the variable temperature compartment 30.

[0036] More specifically, in one embodiment, Figures 2 to 5 As shown, the partition 12 further includes a freezing side plate 123 and a temperature-changing side plate 121, and the heat-insulating layer 122 is stacked between the freezing side plate 123 and the temperature-changing side plate 121. The freezing side plate 123 is used to form the freezing compartment 20, and the temperature-changing side plate 121 is used to form the temperature-changing compartment 30. A recess 1221 is provided on the side of the heat-insulating layer 122 opposite to the temperature-changing side plate 121, which is used to form the temperature-changing air duct 124 with the temperature-changing side plate 121. The outlet of the temperature-changing air duct 124 is arranged on the temperature-changing side plate 121.

[0037] After the cold air controlled by the damper 17 enters the variable temperature air duct 124, it is located in the depression 1221 of the insulation layer 122, and then discharged into the variable temperature compartment 30 through the outlet of the variable temperature air duct 124 on the variable temperature side plate 121. The influence of the cold air in the variable temperature air duct 124 on the temperature of the freezing compartment 20 is avoided as much as possible. Moreover, the depression 1221 is arranged on the side of the insulation layer 122 opposite to the variable temperature side plate 121, that is, the insulation layer 122 is not completely penetrated in the thickness direction, but a certain thickness is retained. Therefore, the insulation layer 122 is always used to isolate the temperature between the variable temperature compartment 30 and the freezing compartment 20. It is ensured that the temperature of the variable temperature compartment 30 can be accurately controlled when it is arranged next to the freezing compartment 20.

[0038] Specifically, in one embodiment, Figures 3 to 5 As shown, there may be multiple outlets of the variable temperature air duct 124 on the variable temperature side plate 121, and the outlets of the multiple variable temperature air ducts 124 are spaced apart on the variable temperature side plate 121. This allows the cold air in the variable temperature air duct 124 to be more evenly diffused into the variable temperature chamber 30, thereby ensuring the uniformity of the temperature at each location in the variable temperature chamber 30.

[0039] Of course, when there are multiple outlets of the variable temperature air duct 124 , each outlet of the variable temperature air duct 124 is connected to the variable temperature air duct 124 .

[0040] Further, in one embodiment, if Figure 4 As shown, the outlet of the variable temperature air duct 124 is located above the inlet of the variable temperature air duct 124. The above mentioned here means that after the partition 12 and the back plate 11 are docked, the partition 12 and the back plate 11 are arranged as shown in FIG. Figure 1 After the angle is set vertically, the entrance of the variable temperature air duct 124 is above the entrance. The entrance of the variable temperature air duct 124 needs to be connected with the docking port 1132. Preferably, the setting height of the docking port 1132 on the back plate 11 is consistent with the setting height of the entrance of the variable temperature air duct 124 on the partition 12, so that the connection sealing is high. Based on the fact that the cold air mainly sinks downward after entering the variable temperature chamber 30, in order to make the temperature uniformity in the variable temperature chamber 30 higher. Figure 4 As shown, the inlet of the variable temperature air duct 124 is arranged above the outlet of the variable temperature air duct 124 .

[0041] Furthermore, if Figure 4As shown, the variable temperature air duct 124 includes a summary input section 1241 and an output section 1242 that are interconnected, and the summary input section 1241 and the output section 1242 are arranged at an angle. A guide protrusion 18 is provided on the bottom wall of the recess 1221, and the guide protrusion 18 is located at the junction of the summary input section 1241 and the output section 1242. The cold air in the summary input section 1241 is guided so that it enters the output section 1242 more smoothly, reducing the resistance of the cold air when it circulates in the variable temperature air duct 124.

[0042] More specifically, in one embodiment, Figure 4 As shown, the summary input section 1241 is arranged along the transverse direction of the partition 12, and the output section 1242 is arranged along the longitudinal direction of the partition 12.

[0043] Optionally, the setting angle between the summary input section 1241 and the output section 1242 may also be other values.

[0044] However, in one embodiment, if Figures 3 to 5 As shown, when there are multiple outlets of the variable temperature air duct 124, the outlets of the multiple variable temperature air ducts 124 are spaced apart in the longitudinal direction of the partition 12 to make the temperature uniformity in the variable temperature chamber 30 better. The longitudinally arranged output section 1242 enables the outlets of each variable temperature air duct 124 to be connected to the output section 1242.

[0045] At this time, if Figures 3 to 5 As shown, in one embodiment, the position where the output section 1242 is connected to the summary input section 1241 is the intersection position, the portion of the output section 1242 located above the intersection position is the first section, and the portion of the output section 1242 located below the intersection position is the second section. The side of the guide protrusion 18 facing the corner of the summary input section 1241 and the first section is an arc-shaped guide surface 181.

[0046] The guide protrusion 18 is arranged at the junction of the first section, the second end and the summary input section 1241. In order to preferentially guide the cold air into the outlet located at the upper side of the outlets of the variable temperature air ducts 124 arranged longitudinally, the side of the guide protrusion 18 facing the corner of the summary input section 1241 and the first section is an arc-shaped guide surface 181. When the cold air in the first section cannot be discharged in time, it can flow downward and be discharged into the variable temperature chamber 30 from the outlet of the variable temperature air duct 124 below. Of course, the cold air in the summary input section 1241 can also directly flow into the second section through the bottom of the guide protrusion 18.

[0047] Furthermore, if Figure 6 and Figure 8As shown, a variable temperature return air port 1134 may be provided on the second portion 112 of the back plate 11 , so that the gas after refrigeration in the variable temperature chamber 30 can be discharged from the variable temperature return air port 1134 , thereby realizing the circulation of the gas in the variable temperature chamber 30 .

[0048] More specifically, if Figures 6 to 9 As shown, in one embodiment, the back plate 11 includes an inner plate 113, a heat insulation layer 114 and an outer plate 115 stacked in sequence. The outer plate 115 is provided with a groove 1151, which is used to form the main air duct 1111 with the inner plate 113. The inlet of the main air duct 1111 is arranged on the outer plate 115, the freezing outlet 1131 is arranged on the inner plate 113, and the docking port 1132 is arranged on the inner plate 113.

[0049] like Figure 2 As shown, the cold air output by the evaporator first enters the groove 1151 from the inlet of the main air duct 1111 on the outer plate 115, and then a part of it is Figure 1 and Figure 6 After passing through the insulation layer 114, the refrigeration outlet 1131 on the inner plate 113 is discharged into the freezing chamber 20, and a portion of the refrigeration outlet 1131 on the inner plate 113 is discharged into the freezing chamber 20. Figure 2 As shown, after passing through the heat insulation layer 114 , it enters the variable temperature air duct 124 through the docking port 1132 .

[0050] The heat insulating layer 114 in the back plate 11 also has a certain heat insulating effect on the temperature changing compartment 30 and the freezing compartment 20 .

[0051] Further, in one embodiment, if Figure 1 , Figure 6 and Figure 7 As shown, the inner plate 113 is provided with a refrigerated return air port 1133 and a variable temperature return air port 1134. The refrigerated return air port 1133 is located on the first portion 111, and the variable temperature return air port 1134 is located on the second portion 112. The inner plate 113 is provided with a return air groove 1135, and the refrigerated return air port 1133 and the variable temperature return air port 1134 are both connected to the return air groove 1135.

[0052] The cold air entering the return air groove 1135 from the temperature-changing chamber 30 from the temperature-changing return air port 1134 merges with the cold air entering the return air groove 1135 from the freezing return air port 1133 and then is discharged from the return air groove 1135, thereby realizing the circulation of gas between the freezing chamber 20 and the evaporator, and the circulation of gas between the temperature-changing chamber 30 and the evaporator.

[0053] More specifically, in one embodiment, Fig. 9As shown, the heat insulation layer 114 is a heat insulation sponge, and the cold air in the main air duct 1111 can pass through the heat insulation sponge and enter the freezing chamber 20 and the temperature changing chamber 30 respectively. Figure 2 As shown, a fan 19 is provided at the entrance of the main air duct 1111 to provide power for the flow of cold air in the main air duct 1111.

[0054] Furthermore, if Figure 1 As shown, in one embodiment, the refrigerator 10 further includes a side panel frame 13, a refrigerating back panel 14 and a middle layer partition 15. The refrigerating back panel 14 is connected to the upper part of the back panel 11 to form a total back panel 16, the side panel frame 13 is arranged along the edge of the total back panel 16, the middle layer partition 15 is arranged at the position where the refrigerating back panel 14 and the back panel 11 are connected, and a refrigerating compartment 40 is formed above the middle layer partition 15, and the refrigerating outlet of the main air duct 1111 is connected to the refrigerating compartment 40. The single refrigeration system is realized to refrigerate the freezing compartment 20, the refrigerating compartment 40 and the variable temperature compartment 30 at the same time.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A refrigerator, characterized in that: The refrigerator comprises a back plate and a partition, wherein the partition is butted against the inner side of the back plate, and the back plate is divided into a first part and a second part, wherein the first part is used to form a freezing chamber, and the second part is used to form a variable temperature chamber, wherein a main air duct is arranged in the first part, wherein the inlet of the main air duct can be communicated with the evaporator of the refrigerator, and the freezing outlet of the main air duct is communicated with the freezing chamber, wherein the position on the back plate butted against the partition is a butting portion, and the butting port of the main air duct is arranged in the butting portion, wherein a variable temperature air duct is arranged in the partition, wherein a damper is arranged in the variable temperature air duct, wherein the inlet of the variable temperature air duct is communicated with the butting port, and the outlet of the variable temperature air duct is communicated with the variable temperature chamber; The partition includes a heat preservation layer, a freezing side plate and a temperature-changing side plate, the heat preservation layer is stacked between the freezing side plate and the temperature-changing side plate, the freezing side plate is used to form the freezing compartment, the temperature-changing side plate is used to form the temperature-changing compartment, and the temperature-changing air duct is arranged in the heat preservation layer; The outlet of part of the variable temperature air duct is located above the inlet of the variable temperature air duct, the variable temperature air duct includes a summary input section and an output section that are interconnected, the summary input section and the output section are arranged at an angle, a recess is provided on the side of the insulation layer opposite to the variable temperature side plate, and is used to form the variable temperature air duct with the variable temperature side plate; a guide protrusion is provided on the bottom wall of the recess, and the guide protrusion is located at the junction of the summary input section and the output section; The position where the output section is connected to the summary input section is the intersection, the portion of the output section located above the intersection is the first section, the portion of the output section located below the intersection is the second section, and the side of the guide protrusion facing the corner between the summary input section and the first section is an arc-shaped guide surface.

2. The refrigerator according to claim 1, characterized in that: The air door is arranged at the entrance of the temperature-variable air duct.

3. The refrigerator according to claim 1, characterized in that: The outlet of the temperature-changing air duct is arranged on the temperature-changing side plate.

4. The refrigerator according to claim 1, characterized in that: The summary input section is arranged along the transverse direction of the partition, the output section is arranged along the longitudinal direction of the partition, the variable temperature air duct has multiple outlets, and the outlets of the multiple variable temperature air ducts are arranged at intervals in the longitudinal direction of the partition, and each outlet of the variable temperature air duct is connected to the output section.

5. The refrigerator according to claim 1, characterized in that: The back plate includes an inner plate, an insulating layer and an outer plate stacked in sequence, the outer plate is provided with a groove for forming the main air duct with the inner plate, the inlet of the main air duct is arranged on the outer plate, the freezing outlet is arranged on the inner plate, and the docking port is arranged on the inner plate.

6. The refrigerator according to claim 5, characterized in that: A refrigerated return air inlet and a variable temperature return air inlet are provided on the inner plate. The refrigerated return air inlet is located on the first part, and the variable temperature return air inlet is located on the second part. A return air groove is provided on the inner plate. The refrigerated return air inlet and the variable temperature return air inlet are both connected to the return air groove.

7. The refrigerator according to claim 5, characterized in that: The heat insulation layer is a heat insulation sponge, and a fan is arranged at the entrance of the main air duct.

8. The refrigerator according to any one of claims 1 to 7, characterized in that: It also includes a side panel frame, a refrigerated back panel and a middle partition. The refrigerated back panel is connected to the top of the back panel to form a total back panel. The side panel frame is arranged along the edge of the total back panel. The middle partition is arranged at the position where the refrigerated back panel and the back panel are connected. A refrigerated compartment is formed above the middle partition. The refrigerated outlet of the main air duct is connected to the refrigerated compartment.

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