A design method for thin refrigeration air duct

Abstract

The present invention discloses a design method for a thin freezing air duct, which includes a duct front cover, a thin fan and a duct rear cover. The present invention reduces the thickness of the thin freezing air duct by adopting a thin fan, thereby improving the usable volume of the upper freezer drawer. At the same time, the fluid domain and calculation domain of the thin freezing air duct are analyzed and calculated by combining CFD software simulation with duct fluid domain visualization simulation, which not only improves the usable volume of the upper freezer drawer of the thin freezing air duct, but also optimizes the fluid domain profile, the position and size of each air supply port, and determines parameters such as the diameter of the fan air inlet, so as to predict and avoid design problems in advance, improve design quality and design efficiency, and achieve the best matching effect.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a design method for a thin freezing air duct. Background Art

[0002] Modern home design pays more and more attention to integrity and aesthetics. Refrigerators with high volume ratio can be designed to be thinner and more compact, easier to embed into cabinets or coordinate with other furniture, meeting users' requirements for home aesthetics.

[0003] The larger the volume of the air-cooled refrigerator, the greater the demand for air volume. Figure 1 As shown in the figure, a larger air volume required by the existing freezer duct (reference freezer duct) means a larger fan blade diameter and a thicker fan. Due to this limitation, the area where the fan is placed in the freezer duct (area 1) is often thicker than other areas (area 2), resulting in a smaller drawer volume in the fan area (area 1). Summary of the Invention

[0004] The present invention aims to provide a design method for a thin refrigeration air duct, aiming to at least solve the technical problems existing in the above-mentioned prior art. To achieve the above-mentioned purpose, the technical solutions adopted by the present invention are as follows:

[0005] A thin refrigeration air duct, comprising:

[0006] An air duct front cover, wherein the upper portion of the front side of the air duct front cover is provided with an upper left air supply port and an upper right air supply port, the middle portion of the front side of the air duct front cover is provided with a middle left air supply port and a middle right air supply port, the front lower portion of the air duct front cover is provided with a lower left air supply port and a lower right air supply port, and the upper portion of the front side of the air duct front cover is also provided with a fan installation area;

[0007] A thin fan, the thin fan being fixedly mounted in the fan installation area, the thin fan comprising a plurality of blades of alternating long and short lengths;

[0008] An air duct rear cover is fixedly mounted on the rear side of the air duct front cover, a refrigerated air supply port is provided on the top of the air duct rear cover, a fan air inlet is provided on the upper portion of the air duct rear cover, and an air guide plate is provided on the front side of the air duct rear cover, the air guide plate forming an air duct fluid domain;

[0009] Wherein, the upper left air supply port and the upper right air supply port are located behind the middle left air supply port and the middle right air supply port.

[0010] As a further solution of the present invention: an internal heat insulation layer is provided between the air duct front cover and the air duct rear cover.

[0011] As a further aspect of the present invention, the upper left air supply port and the upper right air supply port are located approximately 10 mm behind the middle left air supply port and the middle right air supply port. In other words, the upper left air supply port and the upper right air supply port are approximately 16 mm thinner than the upper air supply port of the existing reference refrigeration air duct.

[0012] The present invention also provides a design method for a thin refrigeration air duct, which is applied to the thin refrigeration air duct, comprising the following steps:

[0013] Step 1: Use 3D modeling software to preliminarily design a 3D model of the thin refrigeration air duct and determine the design goals;

[0014] Step 2: Extract the duct fluid domain, air inlet fluid domain, and fan blade fluid domain of the thin refrigeration duct to obtain a physical model for CFD fluid simulation, and set the air temperature T value in the duct fluid domain, the thin fan speed parameter N value, and the fan inlet diameter parameter φ value;

[0015] Step 3: Determine whether the total air volume of each air outlet of the thin air duct, the air volume ratio of the refrigeration air outlet, the total air volume ratio of the air outlet of the upper freezer drawer, and the air volume difference between the two air outlets of each freezer drawer calculated by simulation meet the design goals, and observe whether there is obvious vortex in the air duct fluid domain;

[0016] Step 4: If step 3 meets the design goal, proceed to step 5. If step 3 does not meet the goal, modify the thin refrigeration duct 3D model in step 1 according to the simulation data, and repeat steps 2 and 3 until step 3 meets the design goal;

[0017] Step 5: After the design goals are met, the air duct calculation domain model and the thin fan model are output and 3D printed;

[0018] In step six, the 3D-printed air duct calculation domain model and the thin fan model are assembled, and a visualization analysis of the air duct fluid domain is performed to determine whether there are vortices in the air duct fluid domain. If so, the relevant structure of the air duct calculation domain model is modified, and step six is ​​performed again until the fluid flows smoothly and without vortices in the air duct fluid domain of the air duct calculation domain model. The design of the thin refrigeration air duct is then completed.

[0019] As a further solution of the present invention: the design objectives in step 1 include:

[0020] The total air volume of each air outlet of the thin-type freezing air duct should be equivalent to the total air volume of each air outlet of the reference freezing air duct; the proportion of the air volume of the refrigeration air outlet to the air volume of all air outlets is 25%-30%; the sum of the air volume of the air outlets on the left and right sides of the upper freezer drawer accounts for about 35% of the air volume of all air outlets; and the difference in air volume of the air outlets on both sides of each freezer drawer is less than 2%.

[0021] As a further solution of the present invention: in step 2, the air temperature T in the air duct fluid domain is set to 298.15K, the fan speed parameter N is set to 1400r / min, and the fan inlet diameter parameter is set to φ120mm.

[0022] As a further solution of the present invention: for easy observation, the air duct calculation domain model output in step 4 is divided into two parts: a calculation domain front cover and a calculation domain rear cover, and the calculation domain front cover is a transparent part.

[0023] As a further solution of the present invention: in step 6, the air duct fluid domain visualization analysis method includes:

[0024] Air containing tracer particles is injected into the air inlet fluid domain. The rotating blades of a thin fan draw the air containing tracer particles into the interior of the duct fluid domain. Laser irradiation is used to capture a planar image of a certain section within the duct calculation domain model. High-speed photography technology and high-resolution image processing software are used to clearly observe the flow direction of the air containing tracer particles within the duct fluid domain, thereby determining whether there is eddy current inside the duct fluid domain.

[0025] A refrigerator includes a freezer compartment, wherein a box liner is provided in the freezer compartment, and a thin freezing air duct designed and manufactured by any of the above-mentioned thin freezing air duct design methods is provided on the rear wall of the box liner.

[0026] As a further solution of the present invention: the box is provided with an upper freezer drawer, a middle freezer drawer and a lower freezer drawer from top to bottom, wherein the upper freezer drawer includes an upper freezer left drawer and an upper freezer right drawer, the middle freezer drawer includes a middle freezer left drawer and a middle freezer right drawer, and the lower freezer drawer includes a lower freezer left drawer and a lower freezer right drawer.

[0027] Compared with the existing reference refrigeration air duct, the present invention has at least one of the following beneficial effects:

[0028] (1) The present invention adopts a thin fan, so that the upper left air supply port and the upper right air supply port of the thin freezing air duct can be designed to be located about 10 mm behind the middle left air supply port and the middle right air supply port. That is, the upper left air supply port and the upper right air supply port are thinner by at least 16 mm compared with the upper air supply port of the existing reference freezing air duct, that is, the depth of the upper freezer drawer can be increased by 16 mm, thereby improving the usable volume of the upper freezer drawer;

[0029] (2) The present invention also analyzes and calculates the fluid domain and calculation domain of the thin refrigeration duct by combining CFD software simulation with duct fluid domain visualization simulation. The CFD software simulation can preliminarily determine whether the design goals such as air supply volume are achieved. The duct fluid domain visualization simulation further optimizes the structural design, improves the air supply efficiency, and reduces unfavorable factors such as eddy currents that are prone to generate noise. Compared with the existing reference refrigeration duct, not only the usable volume of the upper freezer drawer of the thin refrigeration duct is improved, but also the fluid domain profile, the position and size of each air supply port are optimized, and the parameters such as the diameter of the fan air inlet are determined, so as to predict and avoid design problems in advance, improve the design quality and design efficiency, and achieve the best matching effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] Figure 1 It is a schematic diagram of the existing reference refrigeration duct structure;

[0032] Figure 2 This is a schematic diagram of a thin refrigeration air duct structure of the present invention;

[0033] Figure 3 This is a schematic diagram of the explosion structure of a thin refrigeration air duct of the present invention;

[0034] Figure 4 This is a schematic diagram of the internal structure of a refrigerator freezer compartment of the present invention;

[0035] Figure 5 This is a schematic flow chart of a thin refrigeration air duct design method of the present invention;

[0036] Figure 6 Schematic diagram of a fluid domain physical model for CFD fluid simulation in an embodiment of the present invention;

[0037] Figure 7 is the simulated calculated value of the air volume at each air outlet of the thin refrigeration air duct in the embodiment of the present invention;

[0038] Figure 8 Schematic diagram of the air duct calculation domain model and thin fan model in an embodiment of the present invention;

[0039] Figure 9 Schematic diagram of visualization analysis of the air duct fluid domain in an embodiment of the present invention.

[0040] In the figure: 1. Duct front cover; 11. Upper left air supply outlet; 12. Upper right air supply outlet; 13. Middle left air supply outlet; 14. Middle right air supply outlet; 15. Lower left air supply outlet; 16. Lower right air supply outlet; 17. Fan installation area; 2. Thin fan; 21. Blades; 3. Duct rear cover; 31. Refrigerated air supply outlet; 32. Fan air inlet; 33. Air guide plate; 4. Internal insulation layer; 5. Duct fluid domain; 6. Air inlet fluid domain; 7. Fan blade fluid domain; 8. Duct computational domain model; 81. Computational domain front cover; 82. Computational domain rear cover; 9. Box liner; 91. Upper left drawer of the freezer; 92. Upper right drawer of the freezer; 93. Middle left drawer of the freezer; 94. Middle right drawer of the freezer; 95. Lower left drawer of the freezer; 96. Lower right drawer of the freezer; 10. Thin fan model. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] See also Figure 2 and Figure 3 As shown, a first embodiment of the present invention provides a thin-type refrigeration air duct, comprising at least a duct front cover 1, a thin fan 2, an internal insulation layer 4, and a duct rear cover 3. The front upper portion of the duct front cover 1 is provided with an upper left air supply port 11 and an upper right air supply port 12; the middle portion of the front upper portion of the duct front cover 1 is provided with a middle left air supply port 13 and a middle right air supply port 14; the front lower portion of the duct front cover 1 is provided with a lower left air supply port 15 and a lower right air supply port 16; and the front upper portion of the duct front cover 1 is also provided with a fan mounting area 17. The thin fan 2 is fixed to the fan mounting area 17 by fixing pins. The thin fan 2 includes a plurality of blades 21 arranged in alternating long and short configurations. In this embodiment, the blades 21 include seven long blades 21 and seven short blades 21. The duct rear cover 3 is fixed to the rear side of the duct front cover 1 by snap fasteners. An internal insulation layer 4 is provided between the duct front cover 1 and the duct rear cover 3. A refrigerated air supply port 31 is provided at the top of the air duct rear cover 3, and the refrigerated air supply port 31 is used to supply air to the refrigerated compartment. A fan air inlet 32 ​​is provided at the upper part of the air duct rear cover 3, and the blades 21 of the thin fan 2 are facing the fan air inlet 32. An air guide plate 33 is provided on the front side of the air duct rear cover 3, and the air guide plate 33 forms an air duct fluid domain 5. The thin fan 2 flows through the air duct fluid domain 5 to respectively deliver the flowing air into each air supply port on the air duct front cover 1.

[0043] It is worth noting that, since the present invention adopts a thin fan 2, the upper left air outlet 11 and the upper right air outlet 12 can be arranged behind the middle left air outlet 13 and the middle right air outlet 14. Figure 1 As shown in FIG. 1 , the upper left air inlet 11 and the upper right air inlet 12 of the present invention can be designed to be located 10 mm behind the middle left air inlet 13 and the middle right air inlet 14. In other words, the upper left air inlet and the upper right air inlet are at least 16 mm thinner than the upper air inlet of the existing reference freezer air duct. This means that the depth of the upper freezer drawer can be increased by 16 mm, thereby increasing the usable volume of the upper freezer drawer.

[0044] However, the use of a thin fan 2 will bring about problems such as small air volume, low air supply efficiency and high noise generated by eddy currents. Therefore, it is necessary to optimize the design of the thin refrigeration air duct using the thin fan 2.

[0045] See also Figure 5 As shown, the second embodiment of the present invention provides a design method for a thin refrigeration air duct, which optimizes the parameters such as the structure of the thin fan 2 in the first embodiment, the area of ​​each air supply port of the thin refrigeration air duct, and the fluid domain profile of the thin refrigeration air duct to achieve the best matching effect.

[0046] The method comprises the following steps:

[0047] Step 1: Use 3D modeling software to preliminarily design a 3D model of the thin refrigeration air duct in Example 1 and determine the design goals.

[0048] The refrigerated air supply port 31 is arranged at the top of the thin freezing air duct, and the other six air supply ports are located two by two above each layer of freezing drawers, with a total of three layers of freezing drawers. The air duct area corresponding to the upper freezing drawer is at least 16 mm thinner than the existing reference freezing air duct, thereby increasing the usable volume of the upper freezing drawer.

[0049] Design objectives: The sum of the air volume of each air outlet of the thin-type freezing air duct should be equivalent to the sum of the air volume of each air outlet of the reference freezing air duct; the air volume of the refrigerator air outlet 31 accounts for 25%-30% of the air volume of all air outlets; the sum of the air volume of the air outlets on the left and right sides of the upper freezer drawer accounts for about 35% of the air volume of all air outlets; and the air volume difference between the air outlets on both sides of each freezer drawer is less than 2%, and there is no obvious vortex in the air duct fluid domain 5.

[0050] Step 2, please refer to Figure 6As shown, ANSYS Fluent, CFX, and other software were used to extract the duct fluid domain 5, air inlet fluid domain 6, and fan blade fluid domain 7 from the three-dimensional model of the thin refrigeration duct, thereby obtaining a physical model for CFD fluid simulation. The fluid domain of thin fan blade 21 is a rotating domain, while the remaining domains are stationary. Each air outlet of the thin refrigeration duct is numbered. ANSYS ICEM was used for meshing, with tetrahedrons being the primary mesh element. The air temperature T within the fluid domain was set to 298.15 K, the speed parameter N of thin fan 2 was set to 1400 r / min, and the diameter parameter of fan inlet 32 ​​was set to φ120 mm.

[0051] Step 3, please refer to Figure 7 As shown, the simulation results are analyzed to determine whether the total air volume of each air outlet of the thin air duct, the air volume proportion of the refrigeration air outlet 31, the total air volume proportion of the air outlet of the upper freezer drawer, and the air volume difference between the two air outlets of each freezer drawer meet the design goals, and observe whether there is obvious vortex in the air duct fluid domain 5.

[0052] Step 4: If step 3 meets the design goal, proceed to step 5. If step 3 does not meet the goal, modify the three-dimensional model of the thin refrigeration duct in step 1 according to the simulation data, and repeat steps 2 and 3 until step 3 meets the design goal.

[0053] For example, simulations revealed that the total airflow from each outlet of a thin refrigeration duct was lower than that of an existing reference refrigeration duct. Analysis revealed that the thin duct resulted in high internal turbulence, leading to a small negative pressure zone within the duct. To increase airflow, the thin refrigeration fan blades 21 were optimized, increasing the number of blades to 14 and adopting a long-short staggered arrangement. Further simulations verified that the total airflow increased by 20%, reaching the design target of matching the total airflow from each outlet of the reference refrigeration duct.

[0054] Step 5, please refer to Figure 8 As shown, after the design goals are met, the duct calculation domain model 8 and the thin fan model 10 are output and 3D printed; for easy observation, the duct calculation domain model 8 output in step 4 is divided into two parts: the calculation domain front cover 81 and the calculation domain rear cover 82, and the calculation domain front cover 81 is a transparent part.

[0055] Step 6, please refer to Figure 9 As shown, the 3D-printed air duct calculation domain model 8 and the thin fan model 10 are assembled, and the air duct fluid domain visualization analysis is performed to determine whether there is eddy current in the air duct fluid domain 5; if so, the relevant structure of the air duct calculation domain model 8 is modified, and step six is ​​performed again until the fluid flows smoothly and without eddy current in the air duct fluid domain 5 of the air duct calculation domain model 8, and the design of the thin refrigeration air duct is completed.

[0056] Among them, the visualization analysis methods of the air duct fluid domain include:

[0057] Air containing tracer particles is injected into the air inlet fluid domain 6. The blades 21 of the thin fan 2 rotate, sucking the air containing tracer particles into the air duct fluid domain 5. The plane image of a certain cross-section inside the air duct calculation domain model 8 is captured by laser irradiation, and the flow direction of the air containing tracer particles inside the air duct fluid domain 5 is clearly observed using high-speed photography technology and high-resolution image processing software, thereby determining whether there is a vortex inside the air duct fluid domain 5.

[0058] For example: See Figure 9 As shown, from the visualization analysis of the air duct fluid domain, it was found that obvious vortex appeared at the corner of the upper left air supply outlet 11 and the upper right air supply outlet 12, which was not detected in the CFD simulation results of step 2. This problem was solved by moving the upper left air supply outlet 11 and the upper right air supply outlet 12 upward in the air duct calculation domain model 8.

[0059] Under the premise of improving the usable volume of the upper drawer, the present invention analyzes and calculates the fluid domain and calculation domain of the thin freezing duct by combining CFD software simulation with duct fluid domain visualization simulation. The CFD software simulation can preliminarily determine whether the design goals such as the air supply volume are achieved. The duct fluid domain visualization simulation further optimizes the structural design, improves the air supply efficiency, and reduces unfavorable factors such as eddy currents that are prone to generate noise. Compared with the existing reference freezing duct, not only the usable volume of the thin freezing duct freezing upper drawer is improved, but also the fluid domain profile, the position and size of each air supply port are optimized, and the parameters such as the diameter of the fan air inlet 32 ​​are determined, so as to predict and avoid design problems in advance, improve the design quality and design efficiency, and achieve the best matching effect.

[0060] See also Figure 4As shown, a third embodiment of the present invention provides a refrigerator including a freezer compartment, wherein a housing 9 is provided within the freezer compartment. A thin freezing duct designed and manufactured using the thin freezing duct design method of the second embodiment is provided on the rear wall of the housing 9. From top to bottom, the housing 9 includes an upper freezing drawer, a middle freezing drawer, and a lower freezing drawer. Among them, the upper freezer drawer includes the upper freezer left drawer 91 and the upper freezer right drawer 92, the upper left air supply port 11 is located above the upper freezer left drawer 91, and the upper right air supply port 12 is located above the upper freezer right drawer 92, the middle freezer drawer includes the middle freezer left drawer 93 and the middle freezer right drawer 94, the middle left air supply port 13 is located above the middle freezer left drawer 93, and the middle right air supply port 14 is located above the middle freezer right drawer 94, the lower freezer drawer includes the lower freezer left drawer 95 and the lower freezer right drawer 96, the lower left air supply port 15 is located above the lower freezer left drawer 95, and the lower right air supply port 16 is located above the lower freezer right drawer 96.

[0061] The above detailed description of the preferred embodiments of the present invention should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent of the present invention.

Claims

1. A design method for a thin refrigeration air duct, characterized in that: The thin refrigeration air duct comprises: An air duct front cover, wherein the upper portion of the front side of the air duct front cover is provided with an upper left air supply port and an upper right air supply port, the middle portion of the front side of the air duct front cover is provided with a middle left air supply port and a middle right air supply port, the front lower portion of the air duct front cover is provided with a lower left air supply port and a lower right air supply port, and the upper portion of the front side of the air duct front cover is also provided with a fan installation area; A thin fan, the thin fan being fixedly mounted in the fan installation area, the thin fan comprising a plurality of blades of alternating long and short lengths; An air duct rear cover is fixedly mounted on the rear side of the air duct front cover, a refrigerated air supply port is provided on the top of the air duct rear cover, a fan air inlet is provided on the upper portion of the air duct rear cover, and an air guide plate is provided on the front side of the air duct rear cover, the air guide plate forming an air duct fluid domain; Wherein, the upper left air supply port and the upper right air supply port are located behind the middle left air supply port and the middle right air supply port; The design method of the thin refrigeration air duct comprises the following steps: Step 1: Use 3D modeling software to preliminarily design a 3D model of the thin refrigeration air duct and determine the design goals; Step 2: Extract the duct fluid domain, air inlet fluid domain, and fan blade fluid domain of the thin refrigeration duct to obtain a physical model for CFD fluid simulation, and set the air temperature T value in the duct fluid domain, the thin fan speed parameter N value, and the fan inlet diameter parameter φ value; Step 3: Determine whether the total air volume of each air outlet of the thin air duct, the air volume ratio of the refrigeration air outlet, the total air volume ratio of the air outlet of the upper freezer drawer, and the air volume difference between the two air outlets of each freezer drawer calculated by simulation meet the design goals, and observe whether there is obvious vortex in the air duct fluid domain; Step 4: If step 3 meets the design goal, proceed to step 5. If step 3 does not meet the goal, modify the thin refrigeration duct 3D model in step 1 according to the simulation data, and repeat steps 2 and 3 until step 3 meets the design goal; Step 5: After the design goals are met, the air duct calculation domain model and the thin fan model are output and 3D printed; In step six, the 3D-printed air duct calculation domain model and the thin fan model are assembled, and a visualization analysis of the air duct fluid domain is performed to determine whether there are vortices in the air duct fluid domain. If so, the relevant structure of the air duct calculation domain model is modified, and step six is ​​performed again until the fluid flows smoothly and without vortices in the air duct fluid domain of the air duct calculation domain model. The design of the thin refrigeration air duct is then completed.

2. The design method of a thin refrigeration air duct according to claim 1 is characterized in that: An internal heat insulation layer is provided between the air duct front cover and the air duct rear cover.

3. The design method of a thin refrigeration air duct according to claim 1 or 2, characterized in that: The upper left air supply port and the upper right air supply port are located 10 mm behind the middle left air supply port and the middle right air supply port.

4. A thin refrigeration air duct design method according to claim 1, characterized in that: The design goals described in step one include: The total air volume of each air outlet of the thin-type freezing air duct should be equivalent to the total air volume of each air outlet of the reference freezing air duct; the proportion of the air volume of the refrigeration air outlet to the air volume of all air outlets is 25%-30%; the sum of the air volume of the air outlets on the left and right sides of the upper freezer drawer accounts for about 35% of the air volume of all air outlets; and the difference in air volume of the air outlets on both sides of each freezer drawer is less than 2%.

5. A thin refrigeration air duct design method according to claim 4, characterized in that: In step 2, the air temperature T in the duct fluid domain is set to 298.15K, the fan speed parameter N is set to 1400r / min, and the fan inlet diameter parameter is set to φ120mm.

6. A thin refrigeration air duct design method according to claim 1, characterized in that: For easy observation, the duct calculation domain model output in step 4 is divided into two parts: the calculation domain front cover and the calculation domain back cover. The calculation domain front cover is a transparent part.

7. A method for designing a thin refrigeration air duct according to claim 1, characterized in that: In step six, the air duct fluid domain visualization analysis method includes: Air containing tracer particles is injected into the air inlet fluid domain. The rotating blades of a thin fan draw the air containing tracer particles into the interior of the duct fluid domain. Laser irradiation is used to capture a planar image of a certain section within the duct calculation domain model. High-speed photography technology and high-resolution image processing software are used to clearly observe the flow direction of the air containing tracer particles within the duct fluid domain, thereby determining whether there is eddy current inside the duct fluid domain.

8. A refrigerator comprising a freezer compartment, wherein the freezer compartment is provided with a box liner, characterized in that: A thin refrigeration air duct designed and manufactured according to a thin refrigeration air duct design method according to any one of claims 1 to 7 is provided on the inner rear wall of the box.

9. A refrigerator according to claim 8, characterized in that: The box is provided with an upper freezer drawer, a middle freezer drawer and a lower freezer drawer from top to bottom, wherein the upper freezer drawer includes an upper freezer left drawer and an upper freezer right drawer, the middle freezer drawer includes a middle freezer left drawer and a middle freezer right drawer, and the lower freezer drawer includes a lower freezer left drawer and a lower freezer right drawer.

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