Dual-system refrigerator

Abstract

The invention relates to the technical field of refrigerators, and provides a dual-system refrigerator which comprises a refrigerator body, and a refrigerating inner container and a freezing inner container are arranged in the refrigerator body; the inner side area of the rear wall of the freezing liner is provided with a cold storage refrigeration chamber and a freezing refrigeration chamber which are separated from each other; a refrigeration evaporator and a refrigeration fan are arranged in the refrigeration chamber; a freezing evaporator and a freezing fan are arranged in the freezing refrigeration chamber; the two fans are both centrifugal fans; a refrigeration air circulation assembly is arranged in the refrigeration inner container. A freezing air circulation assembly is arranged in the freezing inner container. Therefore, the refrigerating evaporator, the freezing evaporator and the two fans are flatly laid side by side in the freezing inner container in a planar mode, the area of the back area of the freezing inner container is fully utilized, and the overall thickness of the double systems is controllable. The occupation of the freezing liner in the depth direction is not increased. However, a refrigeration evaporator and a refrigeration fan are removed from the refrigeration liner, so that the depth direction of the storage chamber is obviously prolonged, and the effective storage volume is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of refrigerators, and particularly relates to a dual-system refrigerator. Background Art

[0002] In order to avoid odor cross-tainting in existing air-cooled refrigerators, a dual-evaporator refrigeration system is usually used. A set of refrigeration systems, including an evaporator, a fan, as well as refrigeration pipelines, a capillary tube, a control valve and other components, are respectively installed at the back of the refrigerating chamber and the freezing chamber. To install the components of the refrigeration system, a certain thickness of space needs to be reserved at a position close to the back inside the refrigerating inner liner and the freezing inner liner. Due to the occupation of the inner liner space by the installation space of the refrigeration system, the depth distances of the refrigerating compartment and the freezing compartment of the refrigerator are reduced, resulting in a decrease in the effective storage volume.

[0003] In summary, it is obvious that there are inconveniences and defects in the prior art in actual use, so it is necessary to improve. Summary of the Invention

[0004] Aiming at the above defects, the present invention mainly provides a dual-system refrigerator to solve the technical problem that the dual-system refrigerator occupies a large space and reduces the effective storage volume of the refrigerator.

[0005] To solve the above problems, the present invention provides a dual-system refrigerator, including a box body, wherein a refrigerating inner liner and a freezing inner liner are arranged in the box body; a refrigerating refrigeration chamber and a freezing refrigeration chamber which are separated from each other are arranged in the inner area of the rear wall of the freezing inner liner; a refrigerating evaporator and a refrigerating fan are arranged in the refrigerating refrigeration chamber; a freezing evaporator and a freezing fan are arranged in the freezing refrigeration chamber; both the refrigerating fan and the freezing fan are centrifugal fans;

[0006] A refrigerating air circulation assembly communicated with the refrigerating refrigeration chamber is arranged in the refrigerating inner liner; a freezing air circulation assembly communicated with the freezing refrigeration chamber is arranged in the freezing inner liner.

[0007] According to the dual-system refrigerator of the present invention, a separation groove is formed between the refrigerating refrigeration chamber and the freezing refrigeration chamber, and the separation groove is filled with sealant.

[0008] According to the dual-system refrigerator of the present invention, a heat insulation board is arranged on the outer side of the rear wall of the freezing inner liner.

[0009] According to the dual-system refrigerator of the present invention, a refrigerating air supply duct and a refrigerating air return duct are arranged in the refrigerating refrigeration chamber; the refrigerating air circulation assembly communicates with the refrigerating refrigeration chamber through the refrigerating air supply duct and the refrigerating air return duct; a return air cover plate is arranged on the outer side of the refrigerating fan and the refrigerating evaporator; a return air inlet communicating with the refrigerating refrigeration chamber is arranged at the bottom of the return air cover plate.

[0010] For the dual-system refrigerator according to the present invention, both the refrigerating air supply duct and the refrigerating air return duct are arranged at the top of the refrigerating and refrigerating chamber.

[0011] For the dual-system refrigerator according to the present invention, a plurality of air distribution plates are arranged at intervals on the air return cover plate.

[0012] For the dual-system refrigerator according to the present invention, the freezing air circulation assembly includes a freezing air duct plate and a freezing cover plate arranged on the front side of the freezing air duct plate;

[0013] A plurality of freezing air ducts are arranged on the freezing air duct plate, and a plurality of freezing air outlets communicated with the freezing air ducts are arranged on the freezing cover plate.

[0014] For the dual-system refrigerator according to the present invention, the plurality of freezing air ducts include a first upper air duct, a second upper air duct, a first lower air duct, and a second lower air duct arranged on the freezing air duct plate; the air inlets of each air duct are annularly arranged around the air outlet side of the freezing fan;

[0015] The intersection position of the air inlets of two adjacent air ducts forms an air distribution point; each air distribution point is respectively tangentially connected to the air outlet side of the freezing fan through a virtual line; the tangent points of each virtual line on the air outlet side of the freezing fan are respectively connected to the center point of the freezing fan, dividing the air outlet side into four air outlet areas with arc lengths of S 1 , S 2 , S 3 and S 4 ; each air outlet area respectively corresponds to the air inlet of an air duct, specifically:

[0016] The S 1 area corresponds to the air inlet of the first upper air duct; the S 2 area corresponds to the air inlet of the first lower air duct;

[0017] The S 3 area corresponds to the air inlet of the second lower air duct; the S 4 area corresponds to the air inlet of the second upper air duct.

[0018] For the dual-system refrigerator according to the present invention, the S 1 +S 2 >S 3 +S 4 .

[0019] For the dual-system refrigerator according to the present invention, the S 1 >S 4 , S 2 >S 3 ; meanwhile, S 1 :S 2 ≥7:3, S 4 :S 3 ≥7:3.

[0020] In summary, in the present invention, the refrigerating evaporator and the freezing evaporator with dual-system cooling are both arranged inside the freezing inner container, and the two evaporators and the two blowers are arranged side by side in a planar manner in the middle of the freezing inner container, making full use of the area of the back region of the freezing inner container and enabling the overall thickness of the dual system to be controllable. Compared with the existing dual-system refrigerators, the present invention does not increase the encroachment on the depth direction of the freezing inner container. However, the refrigerating inner container removes the refrigerating evaporator and the refrigerating blower, significantly extending the depth direction of the storage compartment and increasing the effective storage volume. On the premise of retaining the function of preventing odor cross-talk in the dual-system refrigerator, the present invention reduces the installation space occupied by the refrigeration system, significantly increasing the total storage volume of the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the present invention;

[0022] Figure 2 is Figure 1 the internal structural diagram in the direction A in

[0023] Figure 3 is Figure 2 the internal structural diagram in the direction B in

[0024] Figure 4 is Figure 3 the structural diagram in the direction C in

[0025] Figure 5 is Figure 4 the internal structural diagram in the direction D in

[0026] Figure 6 is Figure 5 the internal structural diagram in the direction E in

[0027] Figure 7 is Figure 5 the structural diagram in the direction F in

[0028] Figure 8 is the front view of the freezing air duct plate of the present invention;

[0029] In the figure: 1 - refrigerating inner liner, 11 - refrigerating cover plate, 12 - refrigerating air return opening, 13 - refrigerating air duct plate, 131 - refrigerating air outlet; 14 - refrigerating evaporator, 15 - refrigerating fan; 2 - freezing inner liner, 21 - freezing cover plate, 211 - freezing air outlet; 22 - partition groove, 23 - freezing air duct plate, 24 - freezing fan, 25 - freezing evaporator, 26 - freezing bottom plate, 27 - refrigerating refrigeration chamber, 28 - freezing refrigeration chamber, 29 - wind baffle; 3 - air return seat body, 31 - refrigerating air return duct, 32 - air return cover plate, 33 - air distribution plate, 34 - air return air inlet; 4 - air supply seat body, 41 - refrigerating air supply duct; 5 - air distribution point, 51 - first upper air duct, 52 - second upper air duct, 53 - first lower air duct, 54 - second lower air duct; 100 - box body, 101 - compressor chamber, 102 - heat insulation board. Detailed implementation mode

[0030] Refer to Figure 1 , the present invention provides a dual - system refrigerator, including a box body 100, and a refrigerating inner liner 1 and a freezing inner liner 2 are arranged in the box body 100; refer to Figure 6 , in the inner wall area of the rear wall of the freezing inner liner 2, a refrigerating refrigeration chamber 27 and a freezing refrigeration chamber 28 which are separated from each other are provided; a refrigerating evaporator 14 and a refrigerating fan 15 are arranged in the refrigerating refrigeration chamber 27; a freezing evaporator 25 and a freezing fan 24 are arranged in the freezing refrigeration chamber 28; both the refrigerating fan 15 and the freezing fan 24 are centrifugal fans; the centrifugal fan has a smaller thickness and occupies less space in the depth direction of the inner liner.

[0031] A refrigerating air circulation component communicating with the refrigerating refrigeration chamber 27 is arranged in the refrigerating inner liner 1; a freezing air circulation component communicating with the freezing refrigeration chamber 28 is arranged in the freezing inner liner 2;

[0032] A refrigerating compartment for storing items and a freezing compartment are respectively formed in the refrigerating inner liner 1 and the freezing inner liner 2. The refrigerating air circulation component and the freezing air circulation component respectively realize the independent refrigeration of the refrigerating inner liner 1 and the freezing inner liner 2, and can respectively and independently control the temperatures of the refrigerating compartment and the freezing compartment.

[0033] The refrigerating fan 15 realizes the refrigerating air flow circulation in the refrigerating inner liner 1 through the refrigerating air circulation component, provides cold quantity for the refrigerating compartment, and controls the temperature of the refrigerating compartment.

[0034] The freezing fan 24 realizes the refrigerating air flow circulation in the freezing inner liner 2 through the freezing air circulation component, provides cold quantity for the freezing compartment, and controls the temperature of the freezing compartment.

[0035] Preferably, the refrigerated liner 1 of the present invention is arranged above the frozen liner 2; the refrigerated evaporator 14 and the frozen evaporator 25 are both located in the lower part of the box body 100, close to the compressor cavity 101, reducing the length of the refrigerant pipeline, saving materials and space occupied by the pipeline.

[0036] The refrigeration chamber 27 and the freezing chamber 28 of the present invention are separated from each other, which avoids the cross-flow of refrigeration air between the refrigeration liner 1 and the freezing liner 2, and avoids the odor of the items stored in the refrigeration chamber and the freezing chamber.

[0037] As an example, combining Figure 4 and Figure 5 A partition groove 22 is formed between the refrigeration chamber 27 and the freezing chamber 28, and the partition groove 22 is filled with sealant to improve the sealing performance and prevent air flow from flowing between the refrigeration chamber 27 and the freezing chamber 28.

[0038] The present invention arranges both the refrigeration evaporator 14 and the freezing evaporator 25 of the dual-system cooling inside the freezing liner 2, and the two evaporators and two fans are laid out side by side in a flat surface in the freezing liner 2, thereby making full use of the area of ​​the inner side of the rear wall of the freezing liner 2, so that the overall thickness of the dual system can be controlled. Compared with the existing dual-system refrigerators, the present invention does not increase the depth of the freezing liner 2. However, the refrigeration evaporator 14 and the refrigeration fan 15 are removed from the refrigeration liner 1, so that the depth of the storage compartment is significantly extended, and the effective storage volume is increased. Under the premise of retaining the dual-system refrigerator's function of avoiding odor contamination, the present invention reduces the installation space occupied by the refrigeration system and significantly increases the total storage volume of the refrigerator.

[0039] See also Figure 2 Furthermore, an insulation board 102 is provided on the back outer side of the freezing liner 2 to reduce the loss of cold. The insulation board 102 is preferably a vacuum insulation board.

[0040] See also Figure 4 and Figure 5 The refrigeration chamber 27 is provided with a refrigeration air supply duct 41 and a refrigeration return air duct 31; the refrigeration air circulation component is connected to the refrigeration chamber 27 through the refrigeration air supply duct 41 and the refrigeration return air duct 31;

[0041] The refrigeration fan 15 delivers the cold air flow into the refrigeration compartment through the refrigeration air supply duct 41, and returns the return air from the refrigeration compartment to the refrigeration chamber 27 through the refrigeration return duct 31, thus forming a refrigeration cycle.

[0042] Furthermore, the outer side of the refrigeration fan 15 and the refrigeration evaporator 14 is covered with a return air cover 32; the bottom of the return air cover 32 is provided with a return air inlet 34 connected to the refrigeration chamber 27;

[0043] Based on the effective utilization of the installation space, both the refrigerated air supply duct 41 and the refrigerated air return duct 31 of the present invention are arranged at the top of the refrigerated refrigeration chamber 27, shortening the distance from the refrigerated inner liner 1. If the return air flows directly into the refrigerated refrigeration chamber 27 through the refrigerated air return duct 31, it will be directly sucked away by the refrigerated fan 15 nearby, shortening the heat exchange time with the refrigerated evaporator 14 and reducing the refrigeration effect.

[0044] The present invention provides a return air cover plate 32 to separate the refrigerated air return duct 31 from the refrigerated refrigeration chamber 27. After the return air is sucked into the refrigerated air return duct 31, it flows downward along the return air cover plate 32. Then, the return air enters the refrigerated refrigeration chamber 27 from the return air inlet 34 at the bottom, flows upward from the bottom of the refrigerated evaporator 14 for sufficient heat exchange, and then is sent into the refrigerated compartment by the refrigerated fan 15 to ensure the refrigeration effect.

[0045] The return air cover plate 32 of the present invention is preferably made of metal materials such as aluminum alloy or stainless steel with good thermal conductivity. During the flow of the return air, heat exchange can occur with the refrigerated evaporator 14 through the heat conduction of the return air cover plate 32, and the cold quantity is absorbed.

[0046] Furthermore, a plurality of air distribution plates 33 are arranged at intervals on the return air cover plate 32; the return air is divided into multiple airflows and enters the refrigerated refrigeration chamber 27 dispersedly, increasing the contact area with the refrigerated evaporator 14 to ensure the heat exchange effect.

[0047] Combined Figure 5 , the refrigerated air circulation assembly includes a refrigerated air duct plate 23. A refrigerated refrigeration chamber 27 and a frozen refrigeration chamber 28 are formed between the refrigerated air duct plate 23 and the inner wall of the frozen inner liner 2; the suction end of the refrigerated fan 15 faces the refrigerated air duct plate 23 and has a certain distance from the refrigerated air duct plate 23; a wind baffle 29 is further arranged in the refrigerated refrigeration chamber 27. There is a gap between the wind baffle 29 and the refrigerated air duct plate 23 to form an air suction port; the refrigerated air flows through the air suction port and along the refrigerated air duct plate 23 to the suction end of the refrigerated fan 15; the suction effect of the refrigerated fan 15 is ensured.

[0048] See Figure 3 , as an embodiment, the refrigerated air circulation assembly includes a refrigerated air duct plate 13, and a refrigerated cover plate 11 is arranged on the front side of the refrigerated air duct plate 13; a refrigerated air duct is formed in the refrigerated air duct plate 13, and a plurality of refrigerated air outlets 131 communicating with the refrigerated air duct are arranged at the side position of the refrigerated air duct plate 13;

[0049] The refrigerated air duct plate 13 and the refrigerated cover plate 11 of the present invention can adopt applicable known structures.

[0050] The refrigerated air circulation component further includes a return air seat body 3 and a supply air seat body 4; the return air seat body 3 is communicated with the refrigerated return air duct 31; a return air inlet 34 communicated with the refrigerated inner container 1 is further arranged on the return air seat body 3;

[0051] The supply air seat body 4 is communicated with the refrigerated supply air duct 41 and the refrigerated air duct plate 13; preferably, a controllable air door is arranged on the supply air seat body 4 to adjust the flow rate of the refrigerated air flow so that the refrigerated compartment reaches a predetermined temperature.

[0052] The supply air seat body 4 and the return air seat body 3 of the present invention can be of known structures.

[0053] See Figure 7 and Figure 8 , as an embodiment of the freezing air circulation component of the present invention, the freezing air circulation component includes a freezing air duct plate 23 and a freezing cover plate 21 arranged on the front side of the freezing air duct plate 23;

[0054] A plurality of freezing air ducts are arranged on the freezing air duct plate 23, and a plurality of freezing air outlets 211 communicated with the freezing air ducts are arranged on the freezing cover plate 21;

[0055] Preferably, a freezing bottom plate 26 is arranged at the bottom of the freezing cover plate 21, and a freezing return air inlet is formed below the freezing bottom plate 26; the freezing return air flow enters the freezing refrigeration chamber 28 from the freezing return air inlet to complete the refrigeration air flow circulation.

[0056] See Figure 8 , as an embodiment, the plurality of freezing air ducts include a first upper air duct 51, a second upper air duct 52, a first lower air duct 53 and a second lower air duct 54 arranged on the freezing air duct plate 23; the air inlets of each air duct are arranged around the air outlet side of the freezing fan 24;

[0057] The freezing fan 24 is a centrifugal fan. Based on the working principle of the centrifugal fan, the air flow from the circular air outlet side of the freezing fan 24 flows out in a tangential manner.

[0058] To optimize the flow rate of each air duct and make the freezing compartment refrigerate evenly. As a preferred solution, the junction position of the air inlets of two adjacent air ducts of the present invention forms an air distribution point 5; as Figure 8 shown, for the convenience of description, each air distribution point 5 is marked as w, x, y, z. Each air distribution point 5 is respectively tangentially connected to the air outlet side of the freezing fan 24 through a virtual line; the tangent points of each virtual line on the air outlet side of the freezing fan 24 are respectively connected to the center point of the freezing fan 24, and the air outlet side is divided into four air outlet areas with arc lengths of S 1 , S 2 , S 3 and S 4 ; each air outlet area respectively corresponds to the air inlet of an air duct. Specifically:

[0059] S 1 The area corresponds to the air inlet of the first upper air duct 51; S 2 The area corresponds to the air inlet of the first lower air duct 53;

[0060] S 3 The area corresponds to the air inlet of the second lower air duct 54; S 4 The area corresponds to the air inlet of the second upper air duct 52;

[0061] The arc length of the air outlet area determines the air volume of the corresponding air duct; the relationship between the arc lengths of each air outlet area determines the distribution method of the air volume in each air duct. Those skilled in the art can adaptively set the positions of the respective air distribution points 5 through the structural design of the air duct, and then determine the arc lengths of each air outlet area, so that the air volume in each air duct is within a reasonable range, thereby optimizing the cooling of the refrigerated compartment and making the temperatures at different positions in the refrigerated compartment balanced.

[0062] Taking Figure 8 shown as a reference, as an embodiment, the first upper air duct 51 and the first lower air duct 53 supply cooling to the left half area of the refrigeration inner tank 2, and the second upper air duct 52 and the second lower air duct 54 supply cooling to the right half area of the refrigeration inner tank 2. Due to the structural limitations of the present invention, the refrigeration fan 24 is arranged at a position on the right side. To balance the cooling capacity of the left and right half areas, S 1 +S 2 >S 3 +S 4 ; since the air supply distances in the first upper air duct 51 and the first lower air duct 53 are relatively long, the total air volume in the first upper air duct 51 and the first lower air duct 53 > the total air volume in the second upper air duct 52 and the second lower air duct 54, making the cooling capacity areas of the left and right half areas of the refrigeration inner tank 2 balanced;

[0063] Furthermore, S 1 >S 4 ; the air volume in the first upper air duct 51 is greater than the air volume in the second upper air duct 52, making the cooling of the upper parts of the left and right half areas balanced;

[0064] S 2 >S 3 ; the air volume in the first lower air duct 53 is greater than the air volume in the second lower air duct 54, making the cooling of the lower parts of the left and right half areas balanced;

[0065] Furthermore, since the cold air flow density is large and it naturally flows downward, therefore, to optimize the cooling in the refrigerated compartment:

[0066] S 1 :S 2 ≥7:3, S 4 :S 3≥7:3; The upper air ducts in each half area are allocated with no less than 70% of the cooling capacity supply, thereby optimizing the refrigeration efficiency.

[0067] In the refrigeration system of the existing dual-system refrigerator, the refrigerating evaporator 14 and the freezing evaporator 25 are connected in parallel so as to be able to refrigerate independently.

[0068] The refrigerating evaporator 14 and the freezing evaporator 25 of the refrigeration system of the present invention can be connected in series or in parallel. When connected in series, when the temperature of the refrigerating compartment reaches the threshold value and the freezing compartment needs to continue refrigerating, the controllable air door for sending air to the refrigerating compartment can be closed at this time. The refrigerating evaporator 14 continues to refrigerate, but does not affect the temperature of the refrigerating compartment, and the generated cooling capacity can be transmitted to the freezing compartment through the freezing air duct plate 23.

[0069] In summary, the present invention provides a dual-system refrigerator. By arranging both the refrigerating evaporator and the freezing evaporator for dual-system cooling inside the freezing inner liner, and arranging the two evaporators and the two fans in a planar and parallel arrangement in the middle of the freezing inner liner, the area of the back region of the freezing inner liner is fully utilized, and the overall thickness of the dual system can be controlled. Compared with the existing dual-system refrigerator, the present invention does not increase the encroachment on the depth direction of the freezing inner liner. However, the refrigerating inner liner removes the refrigerating evaporator and the refrigerating fan, significantly extending the depth direction of the storage compartment and increasing the effective storage volume. On the premise of retaining the function of preventing odor cross-talk of the dual-system refrigerator, the present invention reduces the installation space occupied by the refrigeration system, significantly increasing the total storage volume of the refrigerator.

[0070] Certainly, the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention. However, these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present invention.

Claims

1. A dual system refrigerator, characterized in that: The invention comprises a box body, wherein a refrigerating inner tank and a freezing inner tank are arranged in the box body; a refrigerating chamber and a freezing chamber separated from each other are arranged in the inner area of ​​the rear wall of the freezing inner tank; a refrigerating evaporator and a refrigerating fan are arranged in the refrigerating chamber; a freezing evaporator and a freezing fan are arranged in the freezing chamber; the refrigerating fan and the freezing fan are both centrifugal fans; The refrigerating inner tank is provided with a refrigerating air circulation component which is communicated with the refrigerating chamber; the freezing inner tank is provided with a freezing air circulation component which is communicated with the freezing chamber.

2. The dual system refrigerator according to claim 1, characterized in that: A partition groove is formed between the refrigerating chamber and the freezing chamber, and the partition groove is filled with sealant.

3. The dual system refrigerator according to claim 1, characterized in that: A heat insulation board is arranged on the outer side of the rear wall of the freezing inner container.

4. The dual system refrigerator according to claim 1, characterized in that: A refrigerated air supply duct and a refrigerated air return duct are provided in the refrigerated refrigeration chamber; the refrigerated air circulation component is connected to the refrigerated refrigeration chamber through the refrigerated air supply duct and the refrigerated return air duct; a return air cover is provided on the outer side of the refrigerated fan and the refrigerated evaporator; a return air inlet connected to the refrigerated refrigeration chamber is provided at the bottom of the return air cover.

5. The dual system refrigerator according to claim 4, characterized in that: The refrigerated air supply duct and the refrigerated air return duct are both arranged on the top of the refrigerated refrigeration chamber.

6. The dual system refrigerator according to claim 4, characterized in that: A plurality of air distribution plates are arranged at intervals on the return air cover plate.

7. The dual system refrigerator according to any one of claims 1 to 6, characterized in that: The refrigeration air circulation assembly comprises a refrigeration air duct plate and a refrigeration cover plate arranged on the front side of the refrigeration air duct plate; The freezing air duct plate is provided with a plurality of freezing air ducts, and the freezing cover plate is provided with a plurality of freezing air outlets connected with the freezing air ducts.

8. The dual system refrigerator according to claim 7, characterized in that: The plurality of refrigeration air ducts include a first upper air duct, a second upper air duct, a first lower air duct and a second lower air duct arranged on the refrigeration air duct plate; the air inlet ring of each air duct is arranged around the air outlet side of the refrigeration fan; The intersection of the air inlets of two adjacent air ducts forms an air distribution point; each air distribution point is tangently connected to the air outlet side of the refrigeration fan through a virtual line; the tangent points of each virtual line on the air outlet side of the refrigeration fan are connected to the center point of the refrigeration fan, and the air outlet side is divided into four air outlet areas with arc lengths of S1, S2, S3 and S4 respectively; each air outlet area corresponds to the air inlet of an air duct, specifically: The S1 area corresponds to the air inlet of the first upper air duct; the S2 area corresponds to the air inlet of the first lower air duct; The S3 area corresponds to the air inlet of the second downwind duct; the S4 area corresponds to the air inlet of the second upwind duct.

9. The dual system refrigerator according to claim 8, characterized in that: S1+S2>S3+S4.

10. The dual system refrigerator according to claim 9, characterized in that: S1>S4, S2>S3; at the same time, S1:S2≥7:3, S4:S3≥7:3.

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