Thin freezing air duct and design method thereof

Abstract

The invention discloses a thin freezing air duct and a design method thereof. The thin freezing air duct comprises an air duct front cover, a thin fan and an air duct rear cover. According to the invention, the thickness of the thin freezing air duct is reduced by adopting the thin fan, so that the use volume of the freezing upper-layer drawer is increased. Meanwhile, the fluid domain and the computational domain of the thin freezing air duct are analyzed and calculated in a mode of combining CFD software simulation and air duct fluid domain visual simulation, so that the use volume of a freezing upper layer drawer of the thin freezing air duct is increased, the molded line of the fluid domain and the position and size of each air supply outlet are optimized, and the reliability of the thin freezing air duct is improved. Parameters such as the diameter of the air inlet of the fan are determined, the design problem is predicted and avoided in advance, the design quality and the design efficiency are improved, and the optimal matching effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of refrigerators, and in particular to a thin freezing air duct and a design method thereof. 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, the larger the air volume required by the existing freezing air duct (reference freezing air duct), the larger the fan blade diameter and the thicker the fan. Due to this limitation, the area (area 1) where the fan is placed in the refrigerator freezing air duct is often thicker than other areas (area 2), resulting in a smaller drawer volume in the area (area 1) where the fan is placed. Summary of the invention

[0004] The purpose of the present invention is to provide a thin refrigeration air duct and a design method thereof, 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] The air duct front cover is provided with an upper layer left air supply port and an upper layer right air supply port at the upper front side of the air duct front cover, a middle layer left air supply port and a middle layer right air supply port are provided at the middle front side of the air duct front cover, a lower layer left air supply port and a lower layer right air supply port are provided at the front lower part of the air duct front cover, and a fan installation area is also provided at the upper front side of the air duct front cover;

[0007] A thin fan, the thin fan is fixedly installed in the fan installation area, and the thin fan includes a plurality of blades of alternately long and short lengths;

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

[0009] Among them, the upper layer left air supply port and the upper layer right air supply port are located behind the middle layer left air supply port and the middle layer 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 solution of the present invention: the upper left air supply port and the upper right air supply port are 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 about 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, and comprises 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, obtain the physical model of 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 proportion of the air volume of the refrigerated air outlet, the total proportion of the air volume of the air outlet of the upper freezer drawer, and the difference in air volume between the two air outlets of each freezer drawer calculated by simulation meet the design objectives, and observe whether there is obvious vortex in the air duct fluid domain;

[0016] Step 4: If step 3 meets the design target, proceed to step 5; if step 3 does not meet the target, 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 target;

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

[0018] Step six, assemble the 3D printed air duct calculation domain model and the thin fan model, and perform a visualization analysis of the air duct fluid domain to determine whether there is an eddy current in the air duct fluid domain; if so, modify the relevant structure of the air duct calculation domain model, and perform step six again until the fluid flows smoothly without eddy current in the air duct fluid domain of the air duct calculation domain model, and the design of the thin refrigeration air duct is 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 freezing upper drawer accounts for about 35% of the air volume of all air outlets; and the difference in air volume between the air outlets on both sides of each layer of the freezing 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 the convenience of 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 fluid domain of the air inlet, and the air containing tracer particles is sucked into the air duct fluid domain through the rotation of the blades of the thin fan. The plane image of a certain section inside the air duct calculation domain model is captured by laser irradiation, and the flow direction of the air containing tracer particles inside the air duct fluid domain is clearly observed by using high-speed photography technology and high-resolution image processing software, so as to determine whether there is eddy current inside the air duct fluid domain.

[0025] A refrigerator comprises a freezing chamber, wherein a box liner is arranged in the freezing chamber, and a thin freezing air duct designed and manufactured by any of the above-mentioned thin freezing air duct design methods is arranged 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 at least 16 mm thinner than 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, so that the usable volume of the upper freezer drawer is improved;

[0029] (2) The present invention also analyzes and calculates the fluid domain and computational 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 have been 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 in conjunction with the accompanying drawings.

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

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

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

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

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

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

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

[0038] Figure 8 is a schematic diagram of a wind duct calculation domain model and a thin fan model in an embodiment of the present invention;

[0039] Fig. 9 It is a schematic diagram of visualization analysis of the air duct fluid domain in an embodiment of the present invention.

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

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0042] See also Figure 2 and Figure 3 As shown, the first embodiment of the present invention provides a thin refrigeration air duct, which at least includes an air duct front cover 1, a thin fan 2, an internal heat insulation layer 4 and an air duct rear cover 3. Among them, the upper left air supply port 11 and the upper right air supply port 12 are arranged at the upper front side of the air duct front cover 1, the middle left air supply port 13 and the middle right air supply port 14 are arranged at the middle front side of the air duct front cover 1, the lower left air supply port 15 and the lower right air supply port 16 are arranged at the front lower part of the air duct front cover 1, and the upper front side of the air duct front cover 1 is also provided with a fan installation area 17. The thin fan 2 is fixedly installed in the fan installation area 17 by a fixing pin, and the thin fan 2 includes a plurality of blades 21 arranged in alternating long and short positions. In this embodiment, the blades 21 include seven long blades 21 and seven short blades 21. The air duct rear cover 3 is fixedly installed on the rear side of the air duct front cover 1 by a buckle, and an internal heat insulation layer 4 is arranged between the air duct front cover 1 and the air duct rear cover 3. A refrigerated air supply port 31 is arranged 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 chamber. A fan air inlet 32 ​​is arranged at the upper part of the air duct rear cover 3, and the blades 21 of the thin fan 2 are directly facing the fan air inlet 32. An air guide plate 33 is arranged 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 supply port 11 and the upper right air supply port 12 of the present invention can be designed to be located 10 mm behind the middle left air supply port 13 and the middle right air supply port 14. That is, the upper left air supply port and the upper right air supply port are at least 16 mm thinner than 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 increasing the usable volume of the upper freezer drawer.

[0044] However, the use of a thin fan 2 will result in 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 thin fan 2 structure in the first embodiment, the air supply port area of ​​each thin refrigeration air duct, the fluid domain profile of the thin refrigeration air duct and other parameters 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 goal.

[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 goal: The total air volume of each air outlet of the thin freezing air duct should be equivalent to the total air volume of each air outlet of the reference freezing air duct; the air volume of the refrigeration 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 difference in air volume of the air outlets on both sides of each freezer drawer is less than 2%, and there is no obvious vortex in the duct fluid domain 5.

[0050] Step 2, see Figure 6As shown, ANSYS Fluent, CFX and other software are used to extract the duct fluid domain 5, air inlet fluid domain 6 and fan blade fluid domain 7 of the thin refrigeration duct from the three-dimensional model of the thin refrigeration duct to obtain the physical model of CFD fluid simulation. Among them, the blade 21 fluid domain of the thin fan 2 is a rotating domain, and the rest is a static domain. Each air outlet of the thin refrigeration duct is numbered. ANSYS ICEM tool is used for meshing, and the mesh units are mainly tetrahedrons. Set the air temperature T in the fluid domain to 298.15K, the speed parameter N of the thin fan 2 to 1400r / min, and the diameter parameter of the fan air inlet 32 ​​to φ120mm.

[0051] Step 3, see 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 refrigerated air outlet 31, the sum of the 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 calculated by the simulation meet the design objectives, and observe whether there is obvious vortex in the air duct fluid domain 5.

[0052] Step 4: If step 3 meets the design goal, go 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: In the simulation calculation, it was found that the total air volume of each air outlet of the thin refrigeration air duct was lower than the total air volume of each air outlet of the existing reference refrigeration air duct. The reason for this was that the air duct was thin and the internal turbulence was large, resulting in a small negative pressure area in the air duct. In order to increase the air volume, the blades 21 of the thin refrigeration fan were optimized, and the number of blades 21 was increased to 14, and the long and short blades were arranged alternately. The simulation calculation was performed again to verify that the total air volume was increased by 20%, reaching the design goal of being equivalent to the total air volume of each air outlet of the reference refrigeration air duct.

[0054] Step 5, see Figure 8 As shown, after the design goal is 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: a calculation domain front cover 81 and a calculation domain rear cover 82, and the calculation domain front cover 81 is a transparent part.

[0055] Step 6, see Fig. 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 an 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 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 air duct fluid domain include:

[0057] Air containing tracer particles is injected into the air inlet fluid domain 6, and the air containing tracer particles is sucked into the air duct fluid domain 5 through the rotation of the blades 21 of the thin fan 2. The plane image of a certain 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 by using high-speed photography technology and high-resolution image processing software, so as to determine whether there is a vortex inside the air duct fluid domain 5.

[0058] For example: See Fig. 9 As shown, from the visualization analysis of the air duct fluid domain, it was found that obvious vortices appeared at the corners 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 air 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 air duct, not only the usable volume of the thin freezing air 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, the third embodiment of the present invention provides a refrigerator, including a freezer compartment, a box 9 is arranged in the freezer compartment, and a thin freezing air duct designed and manufactured by a thin freezing air duct design method of the second embodiment is arranged on the rear wall of the box 9. The box 9 is provided with an upper freezing drawer, a middle freezing drawer and a lower freezing drawer from top to bottom. Among them, the upper freezer drawer includes a left freezer upper drawer 91 and a right freezer upper drawer 92, the upper left air supply port 11 is located above the left freezer upper drawer 91, and the upper right air supply port 12 is located above the right freezer upper drawer 92, the middle freezer drawer includes a left freezer middle drawer 93 and a right freezer middle drawer 94, the middle left air supply port 13 is located above the left freezer middle drawer 93, and the middle right air supply port 14 is located above the right freezer middle drawer 94, the lower freezer drawer includes a left freezer lower drawer 95 and a right freezer lower drawer 96, the lower left air supply port 15 is located above the left freezer lower drawer 95, and the lower right air supply port 16 is located above the right freezer lower drawer 96.

[0061] The above is a detailed description of the preferred embodiments of the present invention, which cannot 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 present invention.

Claims

1. A thin refrigeration air duct, characterized in that: include: The air duct front cover is provided with an upper layer left air supply port and an upper layer right air supply port at the upper front side of the air duct front cover, a middle layer left air supply port and a middle layer right air supply port are provided at the middle front side of the air duct front cover, a lower layer left air supply port and a lower layer right air supply port are provided at the front lower part of the air duct front cover, and a fan installation area is also provided at the upper front side of the air duct front cover; A thin fan, the thin fan is fixedly installed in the fan installation area, and the thin fan includes a plurality of blades of alternately long and short lengths; An air duct rear cover, the air duct rear cover is fixedly mounted on the rear side of the air duct front cover, a refrigerated air supply port is arranged at the top of the air duct rear cover, a fan air inlet is arranged at the upper part of the air duct rear cover, an air guide plate is arranged at the front side of the air duct rear cover, and the air guide plate forms an air duct fluid domain; Among them, the upper layer left air supply port and the upper layer right air supply port are located behind the middle layer left air supply port and the middle layer right air supply port.

2. A thin refrigeration air duct according to claim 1, characterized in that: An internal heat insulation layer is arranged between the air duct front cover and the air duct rear cover.

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

4. A design method for a thin refrigeration air duct, applied to a thin refrigeration air duct as claimed in claim 1, characterized in that: The following steps are involved: 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, obtain the physical model of 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 proportion of the air volume of the refrigerated air outlet, the total proportion of the air volume of the air outlet of the upper freezer drawer, and the difference in air volume between the two air outlets of each freezer drawer calculated by simulation meet the design objectives, and observe whether there is obvious vortex in the air duct fluid domain; Step 4: If step 3 meets the design target, proceed to step 5; if step 3 does not meet the target, 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 target; Step 5: After the design goal is met, the air duct calculation domain model and the thin fan model are output and 3D printed; Step 6: Assemble the 3D printed air duct calculation domain model and the thin fan model, and perform a visualization analysis of the air duct fluid domain to determine whether there is a vortex in the air duct fluid domain; If yes, modify the relevant structure of the air duct calculation domain model and perform step six again until the fluid flows smoothly without eddy current in the air duct fluid domain of the air duct calculation domain model, and the design of the thin refrigeration air duct is completed.

5. A method for designing a thin refrigeration air duct according to claim 4, characterized in that: The design goals described in step 1 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 freezing upper drawer accounts for about 35% of the air volume of all air outlets; and the difference in air volume between the air outlets on both sides of each layer of the freezing drawer is less than 2%.

6. A thin refrigeration air duct design method according to claim 5, 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.

7. A method for designing a thin refrigeration air duct according to claim 4, 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.

8. A method for designing a thin refrigeration air duct according to claim 4, characterized in that: In step six, the air duct fluid domain visualization analysis method includes: Air containing tracer particles is injected into the fluid domain of the air inlet, and the air containing tracer particles is sucked into the air duct fluid domain through the rotation of the blades of the thin fan. The plane image of a certain section inside the air duct calculation domain model is captured by laser irradiation, and the flow direction of the air containing tracer particles inside the air duct fluid domain is clearly observed by using high-speed photography technology and high-resolution image processing software, so as to determine whether there is eddy current inside the air duct fluid domain.

9. A refrigerator, comprising a freezing chamber, wherein a box liner is provided in the freezing chamber, characterized in that: The inner rear wall of the box is provided with a thin freezing air duct designed and manufactured according to a thin freezing air duct design method according to any one of claims 4 to 8.

10. A refrigerator according to claim 9, characterized in that: An upper freezer drawer, a middle freezer drawer and a lower freezer drawer are arranged in the box 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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