Air duct assembly and refrigerator

Abstract

According to the air duct assembly and the refrigerator, the air duct assembly comprises a front cover plate, a rear cover plate and a fan, and an air outlet is formed in the front cover plate; the rear cover plate is fixedly connected to the front cover plate, an air cavity is defined between the rear cover plate and the front cover plate, the air cavity is communicated with the air outlet, and a water drainage opening is formed in the air cavity wall of the air cavity; the fan is installed on the rear cover plate and used for guiding cold air into the air cavity. The front cover plate is provided with a main water outlet, the main water outlet communicates with the water outlet and penetrates through the rear cover plate, and the main water outlet is formed in the air return side of the air duct assembly and is adjacent to the defrosting heating pipe, so that the temperature of the position where the main water outlet is located is relatively high, and icing is avoided; in this way, it can be ensured that cold air conducted through the air duct assembly can conduct sufficient heat exchange, and the effect of improving the refrigerating effect when the refrigerator with the air duct assembly works is achieved; in addition, the effect of improving the air volume when the air duct assembly works and discharges cold air is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field related to household appliances, and in particular relates to an air duct component and a refrigerator. Background Art

[0002] At present, the internal drain outlet of the air duct in the existing refrigerator is usually considered to be on the freezing evaporator side, which makes the drain outlet of the air duct easy to be blocked by ice, so that a small amount of cold air in the air duct directly flows back without heat exchange, which will reduce the heat exchange effect and reduce the refrigeration effect. Utility Model Content

[0003] In view of this, it is necessary to provide an air duct assembly and a refrigerator for solving the above technical problems.

[0004] An air duct assembly, the air duct assembly comprising:

[0005] A front cover plate, with an air outlet provided on it;

[0006] A rear cover plate is fixedly connected to the front cover plate, an air cavity is formed between the rear cover plate and the front cover plate, the air cavity is communicated with the air outlet, and a drainage port is opened on the air cavity wall of the air cavity;

[0007] A fan, mounted on the rear cover plate, for introducing cold air into the air cavity;

[0008] Among them, a main drain outlet is opened on the front cover plate, and the main drain outlet is connected to the drain outlet and passes through the rear cover plate. In addition, the main drain outlet is arranged on the return air side of the air duct assembly and is adjacent to the defrost heating pipe.

[0009] It can be understood that the condensed water discharged from the bottom of the drain port is discharged through the main drain port arranged on the return air side of the air duct assembly and adjacent to the defrost heating pipe, so that the temperature at the location of the main drain port is relatively high to avoid ice formation. This ensures that the cold air conducted by the air duct assembly can undergo sufficient heat exchange, which has the effect of improving the refrigeration effect of the refrigerator using the air duct assembly when it is working; and, the condensed water is transferred through the drain port on the air cavity wall, which can reduce the volume occupied by the air cavity in the air duct assembly, which has the effect of increasing the air volume of the cold air discharged when the air duct assembly is working.

[0010] In one embodiment, a guide surface is formed on the front cover plate, and the guide surface is used to receive condensed water discharged from the drain port and guide the condensed water to flow to the main drain port;

[0011] Wherein, the guide surface is in the shape of an inclined surface, and the inclination angle of the guide surface is greater than 5°.

[0012] It can be understood that using a guide surface with an inclination angle greater than 5° to guide the condensed water to flow to the main drain outlet can make the condensed water flow quickly to the main drain outlet, thereby achieving the effect of timely drainage and preventing freezing.

[0013] In one embodiment, the wind cavity wall is formed with a converging surface on the outer side of the drain port, and the converging surface is used to converge the condensed water formed in the wind cavity to the drain port;

[0014] The converging surface is in the shape of a slope, and the inclination angle of the converging surface is greater than 5°.

[0015] It can be understood that by using a confluence surface with an inclination angle greater than 5° to guide the condensed water in the wind cavity to gather at the drain outlet, the condensed water formed in the wind cavity can be discharged in time to prevent freezing.

[0016] In one embodiment, a notch is provided on the rear cover plate, and the notch is connected to the main drain port;

[0017] Wherein, reinforcing ribs are formed on the rear cover plate.

[0018] It can be understood that reinforcing ribs are formed on the rear cover plate, which can prevent the rear cover plate from reducing its structural strength due to the opening of the notch and ensure the structural strength of the rear cover plate.

[0019] In one of the embodiments, the reinforcing rib is arranged above the notch in the vertical direction, and the reinforcing rib is capable of blocking and guiding the flow of condensed water.

[0020] It can be understood that the reinforcing ribs can block and guide the flow of condensed water, so that the arrangement of the reinforcing ribs has a drainage function.

[0021] In one embodiment, the air duct assembly further includes a protection plate, which is disposed on the rear cover plate at a location close to the defrost heating pipe and is used to protect the rear cover plate;

[0022] Wherein, the protection plate can wrap the portion of the rear cover plate close to the area where the defrost heating pipe is located.

[0023] It is understandable that the protective plate is used to protect the portion of the rear cover plate near the defrost heating pipe, which can prevent the rear cover plate from melting due to being close to the defrost heating pipe, thereby preventing fire.

[0024] In one of the embodiments, the protection plate can be snap-fitted with the rear cover plate; and a position interference portion is formed between the protection plate and the front cover plate to limit the protection plate from falling off the rear cover plate.

[0025] It can be understood that, through the above-mentioned structural setting, it is easy to assemble the protection plate to the rear cover plate and prevent the protection plate from falling off the rear cover plate, which can improve the assembly stability of the protection plate on the rear cover plate.

[0026] In one embodiment, the air duct assembly further includes a flexible member, one end surface of the flexible member is abutted against the rear cover plate and the protective plate, the other end surface of the flexible member is used to abut against the refrigeration evaporator, and the flexible member is deformed under pressure.

[0027] It can be understood that the assembly limit of the protection plate on the rear cover plate is achieved by using the compression deformation of the flexible member, which can further prevent the protection plate from falling off the rear cover plate.

[0028] The present application also seeks protection for a refrigerator comprising a freezing liner and the above-mentioned air duct assembly; the air duct assembly is fixedly installed in the freezing liner.

[0029] In one embodiment, a buckle and a fixing frame are provided on the outer peripheral wall of the front cover plate and / or the outer peripheral wall of the rear cover plate, and the buckle can be engaged with the freezing liner to limit the air duct assembly to the freezing liner;

[0030] The refrigerator further comprises a fixing part, which passes through the fixing frame and is connected to the freezing liner, so as to fix the air duct assembly in the freezing liner.

[0031] It is understandable that the air duct assembly is assembled in the freezing tank by using the snap fasteners and the fixing frame, which can facilitate the assembly and disassembly of the air duct assembly in the freezing tank.

[0032] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0033] The air duct assembly and refrigerator for which protection is sought in the present application use a total drain outlet arranged on the return air side of the air duct assembly and adjacent to the defrost heating pipe to discharge condensed water discharged from the bottom of the drain outlet, so that the temperature at the location of the total drain outlet is relatively high to avoid ice formation, thereby ensuring that the cold air conducted by the air duct assembly can undergo sufficient heat exchange, thereby having the effect of improving the refrigeration effect of the refrigerator using the air duct assembly when working; and, using the drain outlet on the air cavity wall to transfer condensed water, thereby reducing the volume occupied by the air cavity in the air duct assembly, thereby having the effect of increasing the air volume of the cold air discharged when the air duct assembly is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 This is a schematic structural diagram of the air duct assembly, the refrigeration evaporator and the defrost heating tube provided in one embodiment of the present application during assembly.

[0036] Figure 2 This is a cross-sectional view of the air duct assembly, the refrigeration evaporator and the defrost heating tube provided in one embodiment of the present application during assembly.

[0037] Figure 3 This is an exploded view of an air duct assembly provided in one embodiment of the present application.

[0038] Figure 4 for Figure 3 Enlarged view of the middle P part.

[0039] Figure 5 It is a structural schematic diagram of the front cover plate in this application.

[0040] Figure 6 This is a structural schematic diagram of the front cover plate in this application from another perspective.

[0041] Figure 7 This is a schematic diagram of the structure of the rear cover in this application.

[0042] Figure 8 This is a schematic diagram of the structure of the air duct assembly and the freezing tank during assembly provided by one embodiment of the present application.

[0043] Figure numerals: 100, air duct assembly; 10, front cover; 11, air outlet; 12, first sealing rib; 13, guide surface; 14, convex rib; 20, rear cover; 21, second sealing rib; 22, notch; 23, reinforcing rib; 24, clamping hole; 30, fan; 40, protective plate; 41, hook; 42, limiting sleeve; 421, limiting hole; 4211, hole wall; 101, air cavity; 1011, air cavity wall; 1012, converging surface; 110, drain outlet; 120, main drain outlet; 130, fastener; 131, through hole; 140, fixing frame; 200, freezer liner; 210, slot; 300, defrost heating tube; 400, freezer evaporator. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] It should be noted that when an element is referred to as being "provided on" another element, it may be directly provided on the other element or there may be a central element. When an element is considered to be "provided on" another element, it may be directly provided on the other element or there may be a central element at the same time. When an element is considered to be "fixed to" another element, it may be directly fixed to the other element or there may be a central element at the same time.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used 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 term "and / or" used herein includes any and all combinations of one or more related listed items.

[0047] like Figures 1 to 3 As shown, the air duct assembly 100 provided in one embodiment of the present application includes a front cover plate 10, a rear cover plate 20 and a fan 30, wherein an air outlet 11 is provided on the front cover plate 10; the rear cover plate 20 is fixedly connected to the front cover plate 10, and an air cavity 101 is formed between the rear cover plate 20 and the front cover plate 10, the air cavity 101 is connected to the air outlet 11, and a drain port 110 is provided on the air cavity wall 1011 of the air cavity 101; the fan 30 is installed on the rear cover plate 20, and is used for introducing cold air into the air cavity 101; wherein, a main drain port 120 is provided on the front cover plate 10, the main drain port 120 is connected to the drain port 110 and is arranged through the rear cover plate 20, and the main drain port 120 is arranged on the return air side of the air duct assembly 100, and is arranged adjacent to the defrost heating pipe 300. Here, there are multiple air outlets 11, and the positions of the multiple air outlets 11 on the front cover plate 10 can be specifically set according to the needs of use, which will not be elaborated here. It should be noted that the above-mentioned main drain port 120 is arranged adjacent to the defrost heating pipe 300, specifically, the distance between the main drain port 120 and the defrost heating pipe 300 is relatively close.

[0048] It can be understood that the condensed water discharged from the lower drain port 110 is discharged through the main drain port 120 arranged on the return air side of the air duct assembly 100 and adjacent to the defrost heating tube 300, so that the temperature at the location of the main drain port 120 is relatively high to avoid ice formation. This ensures that the cold air conducted by the air duct assembly 100 can undergo sufficient heat exchange, which has the effect of improving the refrigeration effect of the refrigerator using the air duct assembly 100 when it is working; and, the condensed water is transferred through the drain port 110 on the air cavity wall 1011, which can reduce the volume occupied by the air cavity 101 in the air duct assembly 100, which has the effect of increasing the air volume of the cold air discharged from the air duct assembly 100 when it is working.

[0049] like Figure 5 , Figure 6 As shown, the front cover plate 10 is provided with a first sealing rib 12, which is used to enclose the air cavity 101, and the first sealing rib 12 can wrap the air outlet 11 on the front cover plate 10; the rear cover plate 20 is provided with a second sealing rib 21, which is used to enclose the air cavity 101, wherein the second sealing rib 21 is staggered with the first sealing rib 12, so that the second sealing rib 21 can cooperate with the first sealing rib 12 and form a labyrinth structure, which is used to seal the air cavity 101, so as to prevent the cold air introduced into the air cavity 101 by the fan 30 from leaking outward. Here, the second sealing rib 21 is arranged in a similar shape to the first sealing rib 12, and the second sealing rib 21 and the first sealing rib 12 are respectively provided with a drainage port 110 at the lowest position in the vertical direction. It should be noted that, in the present application, the first sealing rib 12 on the front cover plate 10 surrounds the second sealing rib 21 on the rear cover plate 20 . Of course, in other embodiments, the second sealing rib 21 may also surround the first sealing rib 12 .

[0050] like Figure 7 As shown, the wind cavity wall 1011 is formed with a converging surface 1012 on the outside of the drain port 110, and the converging surface 1012 is in the shape of an inclined plane, and the inclination angle of the converging surface 1012 is greater than 5°, and the converging surface 1012 is used to converge the condensed water formed in the wind cavity 101 to the drain port 110. In other words, the wind cavity wall 1011 can use the converging surface 1012 with an inclination angle greater than 5° to guide the condensed water in the wind cavity 101 to converge to the drain port 110, and then discharge it through the drain port 110, so that the condensed water formed in the wind cavity 101 can be discharged in time to prevent ice. Here, the wind cavity wall 1011 is formed with converging surfaces 1012 on the left and right sides of the drain port 110, that is, the drain port 110 is set at the lowest point of the two converging surfaces 1012. It should be noted that in the present application, the number of drain ports 110 is two.

[0051] like Figure 5 , Figure 6As shown, a guide surface 13 is formed on the front cover plate 10, and the guide surface 13 is in the shape of an inclined surface, and the inclination angle of the guide surface 13 is greater than 5°; the guide surface 13 is used to receive the condensed water discharged from the drain outlet 110 and guide the condensed water to flow to the main drain outlet 120. In other words, the front cover plate 10 can use the guide surface 13 with an inclination angle greater than 5° to guide the condensed water to flow to the main drain outlet 120, so that the condensed water can flow quickly to the main drain outlet 120, which plays a role in timely drainage and preventing ice. Here, the front cover plate 10 is formed with guide surfaces 13 on the left and right sides of the main drain outlet 120, that is, the main drain outlet 120 is set at the lowest point of the two guide surfaces 13.

[0052] like Figure 3 , Figure 7 As shown, a notch 22 is provided on the rear cover plate 20, and the notch 22 is connected to the main drain port 120, so that the condensed water flowing out of the main drain port 120 on the front cover plate 10 can be discharged through the notch 22 on the rear cover plate 20, and finally flow into the drain pan (not shown) located below the defrost heating pipe 300.

[0053] It can be understood that since the notch 22 is formed on the rear cover plate 20, the notch will reduce the structural strength of the rear cover plate 20. To this end, as shown in the figure, a reinforcing rib 23 is formed on the rear cover plate 20, and the reinforcing rib 23 is used to reinforce the rear cover plate 20 to ensure that the structural strength of the rear cover plate 20 can meet the use requirements of the air duct assembly 100.

[0054] As preferably, Figure 3 , Figure 7 As shown, the reinforcing rib 23 is arranged above the notch 22 in the vertical direction, and the reinforcing rib 23 can block and guide the flow of condensed water. In other words, the reinforcing rib 23 not only can reinforce the structure of the rear cover plate 20, but also has the function of draining water to promote the flow of condensed water. Here, the number of reinforcing ribs 23 is configured as multiple, and the multiple reinforcing ribs 23 are arranged in sequence along the vertical direction, and the length of each reinforcing rib 23 gradually decreases toward the notch 22.

[0055] As can be seen from the above, since the main drain port 120 of the present application is disposed adjacent to the defrost heating pipe 300, the rear cover plate 20 on the air duct assembly 100 is relatively close to the defrost heating pipe 300, and the rear cover plate 20 is usually a plastic part, and the defrost heating pipe 300 generates a large amount of heat when working. Figure 3As shown, the air duct assembly 100 also includes a protection plate 40, which is disposed on the rear cover plate 20 near the defrost heating tube 300 to protect the rear cover plate 20, so as to prevent the rear cover plate 20 from melting due to being close to the defrost heating tube 300, thereby preventing fire. Here, the protection plate 40 can wrap the part of the rear cover plate 20 near the defrost heating tube 300, wherein the protection plate 40 is a metal plate made of aluminum alloy, copper, etc., and the heat conductivity of the metal plate can be used to evenly distribute the heat of the rear cover plate 20 to avoid local melting due to overheating. Of course, in other embodiments, the protection plate 40 can also be configured as a heat-insulating plate with heat insulation to insulate the rear cover plate 20.

[0056] In one embodiment, the protective plate 40 can be snap-fitted with the rear cover plate 20; and a position interference portion is formed between the protective plate 40 and the front cover plate 10 to limit the protective plate 40 from falling off the rear cover plate 20, thereby achieving the assembly connection of the protective plate 40 on the rear cover plate 20.

[0057] like Figure 4 As shown, a hook 41 is formed on the protection plate 40, and a clamping hole 24 is formed on the rear cover plate 20. The clamping hole 24 is arranged corresponding to the hook 41, and the hook 41 can be clamped into the corresponding clamping hole 24 to achieve the clamping fit between the protection plate 40 and the rear cover plate 20. Of course, in other embodiments, the hook can also be arranged on the rear cover plate 20, and the clamping hole can be arranged on the protection plate 40, which will not be elaborated here.

[0058] like Figures 4 to 6 As shown, the protective plate 40 is also formed with a plurality of limiting holes 421, and the front cover plate 10 is formed with a plurality of convex ribs 14, and the plurality of convex ribs 14 correspond to the plurality of limiting holes 421 one by one, and when the protective plate 40 is assembled to the rear cover plate 20, the convex ribs 14 on the front cover plate 10 can be inserted into the corresponding limiting holes 421, so that a position interference portion can be formed between the convex ribs 14 and the hole wall 4211 of the corresponding limiting hole 421, so as to limit the protective plate 40 from coming off the rear cover plate 20. Here, the protective plate 40 is fitted with the limiting sleeve 42 in a tight fit, and the plurality of limiting holes 421 are arranged on the limiting sleeve 42 in sequence and spaced along the length direction of the limiting sleeve 42.

[0059] Preferably, the air duct assembly 100 further includes a flexible member (not shown), one end surface of the flexible member abuts against the rear cover plate 20 and the protective plate 40, and the other end surface of the flexible member is used to abut against the refrigeration evaporator 400, and the flexible member is deformed under pressure. In other words, the air duct assembly 100 can use the deformed flexible member to achieve assembly limit of the protective plate 40 on the rear cover plate 20, which can further prevent the protective plate 40 from falling off the rear cover plate 20.

[0060] like Figure 8 As shown, the present application also provides a refrigerator, including a freezing liner 200 and the above-mentioned air duct assembly 100, wherein the air duct assembly 100 is fixedly installed in the freezing liner 200.

[0061] like Figure 3 , Figure 5 and Figure 6 As shown, a snap-fit ​​member 130 is provided on the outer peripheral wall of the front cover plate 10 and / or the outer peripheral wall of the rear cover plate 20, and the snap-fit ​​member 130 can be snap-fitted with the freezing liner 200 to limit the air duct assembly 100 to the freezing liner 200. Here, the snap-fit ​​member 130 is provided on the upper and lower sides of the outer peripheral wall of the front cover plate 10, wherein there are three snap-fit ​​members 130 located on the upper side of the front cover plate 10, and the three snap-fit ​​members 130 can be respectively inserted into the card slot 210 of the freezing liner 200, while the snap-fit ​​member 130 located on the lower side of the front cover plate 10 has a certain elasticity, and the snap-fit ​​member 130 can be deformed when being inserted into the freezing liner 200, and can also be deformed when being disassembled. That is, when the air duct assembly 100 is assembled in the freezing liner 200, the buckle 130 on the upper side of the front cover plate 10 can be first aligned with the corresponding slot 210 on the freezing liner 200 and inserted, and then the air duct assembly 100 is driven to rotate, and the buckle 130 on the lower side of the front cover plate 10 can be snapped into the corresponding position on the freezing liner 200 by elastic deformation, and finally the air duct assembly 100 is limited in the freezing liner 200. Of course, in other embodiments, the buckle 130 can also be arranged on the left and right sides of the front cover plate 10, or the buckle 130 can be arranged on the outer peripheral wall of the rear cover plate 20.

[0062] As preferably, Figure 6 As shown, the above-mentioned snap fastener 130 with a certain elasticity is provided with a through hole 131, and the through hole 131 can be inserted with a flat-blade screwdriver. In this way, when the refrigerator is deformed due to foaming, such as when it is difficult to disassemble the air duct assembly 100, a flat-blade screwdriver or other tools can be inserted into the above-mentioned through hole 131 to make the corresponding snap fastener 130 warp up and separate from the freezing liner 200, so as to ensure that the snap fastener 130 will not be broken due to brute force.

[0063] like Figure 3 , Figure 5 and Figure 6As shown, a fixing frame 140 is also provided on the outer peripheral wall of the front cover plate 10 and / or the outer peripheral wall of the rear cover plate 20, so that when the air duct assembly 100 is assembled and limited in the freezing liner 200 through the snap fastener 130, a fixing member (not shown) can be passed through the fixing frame 140 and connected to the freezing liner 200 to fix the air duct assembly 100 to the freezing liner 200. Here, the fixing frame 140 is provided on the left and right sides of the front cover plate 10, and the fixing member can be specifically screws, bolts, etc. Of course, in other embodiments, the fixing frame 140 can also be provided on the outer peripheral wall of the rear cover plate 20, which will not be elaborated here.

[0064] As can be seen from the above, since the air duct assembly 100 is assembled in the freezing liner 200 using the fasteners 130 and the fixing frame 140 located on the periphery of the air duct assembly 100, the fasteners 130 and the fixing frame 140 are visible, and it is convenient to subsequently remove the air duct assembly 100 from the freezing liner 200.

[0065] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above 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.

[0066] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection required by the present invention.

Claims

1. An air duct assembly, characterized in that: The air duct assembly (100) comprises: A front cover plate (10) is provided with an air outlet (11); A rear cover plate (20) is fixedly connected to the front cover plate (10), an air cavity (101) is formed between the rear cover plate (20) and the front cover plate (10), the air cavity (101) is communicated with the air outlet (11), and a drainage port (110) is provided on an air cavity wall (1011) of the air cavity (101); A fan (30) is mounted on the rear cover (20) and is used to introduce cold air into the air cavity (101); The front cover plate (10) is provided with a main drain port (120), the main drain port (120) is connected to the drain port (110) and passes through the rear cover plate (20), and the main drain port (120) is arranged on the return air side of the air duct assembly (100) and is adjacent to the defrost heating pipe (300).

2. The air duct assembly according to claim 1, characterized in that: A guide surface (13) is formed on the front cover plate (10), and the guide surface (13) is used to receive condensed water discharged from the drain port (110) and guide the condensed water to flow toward the main drain port (120); The guide surface (13) is in the shape of an inclined surface, and the inclination angle of the guide surface (13) is greater than 5°.

3. The air duct assembly according to claim 1, characterized in that: The wind cavity wall (1011) is formed with a converging surface (1012) on the outside of the drain port (110), and the converging surface (1012) is used to converge condensed water formed in the wind cavity (101) to the drain port (110); The converging surface (1012) is in the shape of an inclined surface, and the inclination angle of the converging surface (1012) is greater than 5°.

4. The air duct assembly according to claim 1, characterized in that: The rear cover plate (20) is provided with a notch (22), and the notch (22) is in communication with the main drain port (120); Wherein, reinforcing ribs (23) are formed on the rear cover plate (20).

5. The air duct assembly according to claim 4, characterized in that: The reinforcing rib (23) is arranged above the notch (22) in the vertical direction, and the reinforcing rib (23) is capable of blocking and guiding the flow of condensed water.

6. The air duct assembly according to claim 1, characterized in that: The air duct assembly (100) further comprises a protection plate (40), wherein the protection plate (40) is arranged on the rear cover plate (20) at a location close to the defrosting heating tube (300) and is used to protect the rear cover plate (20).

7. The air duct assembly according to claim 6, characterized in that: The protection plate (40) can be snap-fitted with the rear cover plate (20); and a position interference portion is formed between the protection plate (40) and the front cover plate (10) to limit the protection plate (40) from coming off the rear cover plate (20).

8. The air duct assembly according to claim 6, characterized in that: The air duct assembly (100) also includes a flexible member, one end surface of the flexible member is abutted against the rear cover plate (20) and the protective plate (40), and the other end surface of the flexible member is used to abut against the refrigeration evaporator (400), and the flexible member is deformed under pressure.

9. A refrigerator, characterized in that: It comprises a freezing inner container (200) and an air duct assembly (100) according to any one of claims 1 to 8; the air duct assembly (100) is fixedly installed in the freezing inner container (200).

10. The refrigerator according to claim 9, characterized in that: A snap-fitting member (130) and a fixing frame (140) are provided on the outer peripheral wall of the front cover plate (10) and / or the outer peripheral wall of the rear cover plate (20), and the snap-fitting member (130) can be snap-fitted with the freezing inner container (200) to limit the air duct assembly (100) to the inside of the freezing inner container (200); The refrigerator further comprises a fixing member, which passes through the fixing frame (140) and is connected to the freezing inner container (200), and is used for fixing the air duct assembly (100) in the freezing inner container (200).

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