Refrigerated container air duct structure, refrigerated container, refrigerated container control method

Abstract

This invention discloses a refrigerator air duct structure, a refrigerator, and a refrigerator control method. The refrigerator is divided into a refrigerator compartment and an evaporator compartment located on the back side of the refrigerator compartment by a cover. The bottom of the cover has a return air vent connecting the refrigerator compartment and the evaporator compartment. A branch air duct is provided inside the cover. A branch air outlet is located in the middle of the branch air duct corresponding to one side of the evaporator compartment, and a branch air fan is installed to branch the air upwards and downwards. Guide air outlets are respectively located at the upper and lower parts of the branch air duct corresponding to one side of the refrigerator compartment, and upper and lower guide air fans are respectively installed to blow the cold air from the branch air duct into the refrigerator compartment. This invention not only solves the problem of uneven temperature inside the refrigerator caused by the temperature difference between the air outlet and return air outlet, but also solves the problem of uneven temperature caused by a large number of items inside the refrigerator, and also solves the problem of damage caused by direct contact between the DC fan and the evaporator compartment at low temperatures.

Description

Technical Field

[0001] This invention relates to the field of medical refrigerator technology, specifically to a refrigerator air duct structure, a refrigerator, and a refrigerator control method. Background Technology

[0002] Medical refrigerators, used to store medical supplies such as vaccines, medicines, reagents, and blood, are ubiquitous in daily life. Their widespread use in various scenarios and at high frequency has significantly increased the demand for medical refrigerators, while also placing higher requirements on their performance.

[0003] Medical refrigerators are mainly used to store medicines, reagents or vaccines that have strict requirements for storage temperature. The temperature control range is 2 to 8°C, the temperature uniformity inside the box is less than 2°C, and the fluctuation is less than 3°C.

[0004] Currently, the air duct structure of medical refrigerators on the market is relatively simple. Most of them use a traditional structure that uses a single set of refrigeration fans to achieve unidirectional air circulation. The hot air inside the refrigerator is drawn into the air duct by the refrigeration fan, cooled by the evaporator, and then blown into the refrigerator through the air outlet. The cold air blown out of the air outlet takes away the heat inside the refrigerator and is then drawn back into the air duct, thus achieving the purpose of cooling and air circulation. This single-direction air circulation structure can achieve the purpose of cooling inside the refrigerator, but the temperature difference between the air inside the refrigerator near the air outlet and the air inlet is relatively large. Moreover, the temperature difference of the air outlet at different locations will increase the temperature difference inside the refrigerator, which can easily lead to poor temperature uniformity inside the refrigerator. In severe cases, even temperature stratification may occur inside the refrigerator.

[0005] To address this issue, patent CN113865216A3 provides an air duct and medical refrigerator that can improve temperature uniformity within the chamber. This device uses a first fan installed in a flow duct in the middle of the mask and a second fan installed in a stirring duct above the mask. The air duct employs both stirring and circulating circulation to improve temperature uniformity. However, the stirring duct at the top only circulates hot and cold air in the upper part of the chamber; the hot air ultimately enters the area around the evaporator through the return air vent at the bottom. Therefore, the presence of the stirring duct not only fails to improve temperature uniformity but also causes the upper part of the chamber to be hotter than the lower part, resulting in temperature stratification. Summary of the Invention

[0006] In order to solve the technical problem of uneven temperature inside the refrigerator in the prior art, the present invention proposes a refrigerator air duct structure, a refrigerator, and a refrigerator control method.

[0007] The technical solution adopted in this invention is:

[0008] This invention proposes a refrigerated box air duct structure. The refrigerated box is divided into a refrigerated compartment and an evaporator compartment located on the back side of the refrigerated compartment by a cover. The bottom of the cover is provided with a return air vent connecting the refrigerated compartment and the evaporator compartment. The key feature is that the cover is provided with a diversion air duct. A diversion air outlet is provided in the middle of the diversion air duct on one side corresponding to the evaporator compartment, and a diversion fan is provided in the middle to divert air in both upward and downward directions along the diversion air duct. The upper and lower parts of the diversion air duct are respectively provided with guide air outlets on one side corresponding to the refrigerated compartment, and an upper guide fan and a lower guide fan are respectively provided. When rotating in the forward direction, air is drawn in from the diversion air duct and blown into the refrigerated compartment.

[0009] Furthermore, a first damper is provided between the upper guide fan and the split fan in the split duct; a second damper is provided between the lower guide fan and the split fan in the split duct.

[0010] Furthermore, the mask is also provided with a first return air duct and a second return air duct. The upper part of the first return air duct is connected to the upper part of the diversion duct where the upper guide fan is located, and a third damper is provided. The bottom part is connected to the return air area of ​​the evaporator chamber. The upper part of the second return air duct is connected to the bottom of the diversion duct where the lower guide fan is located, and a fourth damper is provided. The bottom part is connected to the bottom return air area of ​​the evaporator chamber.

[0011] Furthermore, the return air inlet is equipped with a return air damper.

[0012] Furthermore, the upper and lower parts of the cold storage compartment are respectively equipped with a first temperature sensor and a second temperature sensor.

[0013] The present invention also proposes a refrigerator, including the above-described refrigerator air duct structure.

[0014] This invention also proposes a refrigerator control method, comprising the following steps:

[0015] The refrigerator is plugged in;

[0016] Control the opening of the diversion fan, upper guide fan, and lower guide fan; open the return air damper, the first damper, and the second damper; and close the third damper and the fourth damper.

[0017] The temperature value T1 of the first temperature sensor and the temperature value T2 of the second temperature sensor are obtained. Based on the temperature values ​​T1 and T2, the opening and closing of each fan and the damper are controlled to make the temperature of the cold storage room uniform.

[0018] The specific steps for controlling the opening and closing of each fan and damper based on temperature values ​​T1 and T2 include:

[0019] When T1≤L1, T2≤L2, and T1-T2≤|a|, where L1 and L2 are preset values ​​and a is a preset deviation; control the shutdown of the diversion fan, the upper guide fan, and the lower guide fan.

[0020] The specific steps for controlling the opening and closing of each fan and damper based on temperature values ​​T1 and T2 include:

[0021] When T1>L1, T2≤L2, where L1 and L2 are preset values; control the upper guide fan to rotate forward to maintain airflow, and the lower guide fan to rotate in reverse to draw air, and close the second air door, the third air door and the return air door, and open the first air door and the fourth air door.

[0022] The specific steps for controlling the opening and closing of each fan and damper based on temperature values ​​T1 and T2 include:

[0023] When T1 > L1 and T2 > L2, where L1 and L2 are preset values, the control of the split fan, upper guide fan, and lower guide fan remains in the state after startup.

[0024] The specific steps for controlling the opening and closing of each fan and damper based on temperature values ​​T1 and T2 include:

[0025] When T1≤L1, T2>L2, where L1 and L2 are preset values; control the lower guide fan to rotate forward to maintain air outlet, the upper guide fan to rotate in reverse to draw air in, and close the first air door, the fourth air door and the return air door, and open the second air door and the third air door.

[0026] Compared with existing technologies, this invention provides an air duct structure capable of adjusting the temperature uniformity inside the chamber. A centrifugal fan is installed in the middle of the cover, and direct current fans are installed at the top and bottom of the cover, above the evaporator. The direct current fans are connected to the inside of the chamber, and the centrifugal fans are connected to the evaporator chamber. The centrifugal fans are also connected to the direct current fans through an air outlet duct. The cold air in the evaporator chamber is transported by the centrifugal fans to the area around the upper and lower direct current fans through the air outlet duct, and then enters the chamber through the direct current fans. During a period of operation, cold air exits from the upper and lower guide fans, and hot air enters the evaporator chamber from the return air inlet at the bottom of the cover. After a period of time, the temperature value detected by the sensors arranged above and below the cover is used to determine whether the temperature inside the chamber is uniform. If it is not uniform, the difference between the upper and lower parts and the set value is determined. At this time, the air damper at the bottom of the cover is closed, and the direction of the upper or lower direct current fans is changed to control the flow direction of the cold and hot air, thereby adjusting the temperature uniformity inside the chamber. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the side structure in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the rear structure in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the side structure of the simultaneous air outlet at the top and bottom in an embodiment of the present invention;

[0031] Figure 4 This is a side view of the structure of the upper air outlet and lower air return in an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the rear structure of the upper air outlet and lower air return in an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the side structure of the lower air outlet and upper air return in an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the rear structure of the lower air outlet and upper air return in an embodiment of the present invention;

[0035] Figure 8 This is a front view of the damper in an embodiment of the present invention;

[0036] Figure 9 This is a top view of the damper in an embodiment of the present invention;

[0037] Figure 10 This is a side view of the damper in an embodiment of the present invention;

[0038] Figure 11 This is a flowchart from an embodiment of the present invention;

[0039] 1. Cold storage room;

[0040] 2. Evaporator chamber;

[0041] 3. Diversion air duct;

[0042] 41. First air damper; 42. Second air damper; 43. Third air damper; 44. Fourth air damper; 45. Return air damper;

[0043] 5. Diverter fan;

[0044] 61. Upper guide fan; 62. Lower guide fan;

[0045] 7. First Wind Path; 8. Second Wind Path;

[0046] 9. Evaporator. Detailed Implementation

[0047] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0048] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0049] Currently, the air duct structure of medical refrigerators on the market is relatively simple. Most of them use a traditional structure that uses a single set of refrigeration fans to achieve unidirectional air circulation. The hot air inside the refrigerator is drawn into the air duct by the refrigeration fan, cooled by the evaporator, and then blown into the refrigerator through the air outlet. The cold air blown out of the air outlet takes away the heat inside the refrigerator and is then drawn back into the air duct, thus achieving the purpose of cooling and air circulation. This single-direction air circulation structure can achieve the purpose of cooling inside the refrigerator, but the temperature difference between the air inside the refrigerator near the air outlet and the air inlet is relatively large. Moreover, the temperature difference of the air outlet at different locations will increase the temperature difference inside the refrigerator, which can easily lead to poor temperature uniformity inside the refrigerator. In severe cases, even temperature stratification may occur inside the refrigerator. To address this issue, the present invention provides an air duct structure capable of regulating the temperature uniformity within the chamber. A centrifugal fan is positioned in the center of the cover, while direct current fans are positioned at the top and bottom of the cover, above the evaporator. The direct current fans are connected to the interior of the chamber, while the centrifugal fans are connected to the evaporator chamber. The centrifugal fans are also connected to the direct current fans via an air outlet duct. Cold air from the evaporator chamber is transported by the centrifugal fans to the vicinity of the upper and lower direct current fans via the air outlet duct, and then enters the chamber through the direct current fans. During a period of operation, cold air exits from the upper and lower guide fans, while hot air enters the evaporator chamber from the return air vent at the bottom of the cover. Inside; after a period of time, the temperature value detected by the sensors arranged above and below the mask is used to determine whether the temperature inside the chamber is uniform. If it is not uniform, the difference between the upper and lower parts and the set value is judged. At this time, the air damper at the bottom of the mask is closed and the direction of the DC fan above or below is changed to control the flow direction of cold air and hot air, thereby adjusting the uniformity of the temperature inside the chamber. This invention can not only solve the problem of uneven temperature inside the chamber caused by the temperature difference between the air outlet and the air return outlet, but also solve the problem of uneven temperature caused by a large number of items inside the chamber. It can also solve the problem of damage caused by the DC fan being in direct contact with the evaporator chamber and the temperature being low.

[0050] like Figure 1 ,2 As shown, this invention proposes a refrigerator air duct structure. The refrigerator is divided into a refrigerator compartment 1 and an evaporator compartment 2 located on the back side of the refrigerator compartment 1 by a cover. The bottom of the cover has a return air vent connecting the evaporator compartment 2 and the refrigerator compartment 1, and a return air damper 45 is provided corresponding to the return air vent. A vertically arranged branching air duct 3 is installed inside the cover. A branching air vent is located on the side of the cover corresponding to the evaporator 9 in the middle of the branching air duct 3. A branching fan 5 is installed inside the branching air duct 3 corresponding to the branching air vent. When the machine 5 is running, the air inlet side faces the evaporator chamber 2, and the air outlet side faces the split air duct 3 to split the air flow vertically. At the same time, the upper and lower parts of the split air duct 3 are respectively provided with guide air outlets on one side of the cold storage compartment 1. An upper guide fan 61 is provided on the upper part of the split air duct 3 to correspond to the upper guide air outlet, and a lower guide fan 62 is provided on the lower part of the split air duct 3 to correspond to the lower guide air outlet. By rotating the guide fan in the forward direction, the cold air in the split air duct 3 can be blown into the cold storage compartment 1 through the guide air outlet.

[0051] The mask structure proposed in this invention allows the cold air in the evaporator chamber to be drawn in by the centrifugal fan, i.e., the split fan 5, and then sent to the guide fans, i.e. the DC fans at the upper and lower ends of the split air duct 3. After being blown into the cold storage chamber 1 by the DC fans, the cold air delivered by the centrifugal fan set in the middle and the air ducts with equal distances at the top and bottom can be more uniform, avoiding the problem of uneven cold air blown out due to different air outlet positions.

[0052] In a specific embodiment, the split fan 5 located in the middle of the mask is a centrifugal fan, and the guide fans located at the upper and lower parts of the mask are DC fans.

[0053] In a specific embodiment, a first damper 41 is provided in the diversion duct 3 near the upper guide fan 61. Closing the first damper 41 can prevent the diversion fan 5 from communicating with the upper guide fan 61. A second damper 42 is provided in the diversion duct 3 near the lower guide fan 62. Closing the second damper 42 can prevent the diversion fan 5 from communicating with the lower guide fan 62.

[0054] Furthermore, the mask is equipped with a first return air duct 7 and a second return air duct 8. The first return air duct 7 can be vertically set on the left side of the branch air duct 3. The upper part of the first return air duct 7 extends horizontally to connect with the upper part of the branch air duct 3 and the position of the upper guide fan 61 is set. The position where the first return air duct 7 connects to the branch air duct 3 is equipped with a third damper 43. The bottom connects to the return air area of ​​the evaporator chamber 2. The second return air duct 8 is vertically set on the right side of the branch air duct 3. The upper part of the second return air duct 8 extends horizontally to connect with the bottom of the branch air duct 3 and the position of the lower guide fan 62 is set. The upper part of the second return air duct 8 connects to the lower part of the branch air duct 3 and the position of the fourth damper 44 is set. The bottom of the second return air duct 8 connects to the bottom return air area of ​​the evaporator chamber 2.

[0055] By setting the first air damper 41, the second air damper 42, the third air damper 43, the fourth air damper 44, and the corresponding air ducts, the cooling circulation direction can be changed by switching the air ducts. The cold storage compartment 1 in the cold storage box can return air through the bottom return air damper 45, or return air through the upper guide fan 61 and the lower guide fan 62 from the first return air duct 7 and the second return air duct 8, so that the upper or lower part of the cold storage compartment 1 can be returned air separately, so that the temperature in the cold storage compartment 1 is uniform and controllable.

[0056] In a specific embodiment, a first temperature sensor and a second temperature sensor (which can be installed on the mask) are respectively installed at the upper and lower parts of the cold storage compartment 1 near the air vents, to detect the temperature of the upper and lower parts of the cold storage compartment 1 respectively.

[0057] In a specific embodiment, Figure 8 , 9 10 are the three views of the damper used above. Figure 10 This simulates the opening and closing states of the damper.

[0058] like Figure 1 , 2 As shown, the present invention also proposes a refrigerator, including the above-mentioned refrigerator air duct structure. The refrigerator specifically includes an evaporator 9, and other refrigeration components corresponding to the evaporator 9, such as a compressor, condenser, electronic expansion valve and other necessary refrigeration components, as well as a controller and other control components for controlling the temperature of the refrigerator.

[0059] The refrigerator of the present invention adopts the above-mentioned air duct structure, which allows for precise adjustment of the temperature of the upper and lower parts of the refrigerator compartment 1, making the temperature of the upper and lower parts of the refrigerator compartment 1 uniform. At the same time, the air duct can be adjusted according to the contents of the refrigerator, so that even when a lot of contents are placed, the temperature of the upper and lower parts of the refrigerator compartment 1 can still be kept uniform.

[0060] like Figure 11 As shown, the present invention also proposes a refrigerator control method, specifically using the above-mentioned refrigerator, including the following steps:

[0061] The refrigerator is plugged in;

[0062] Turn on the diversion fan 5, the upper guide fan 61, and the lower guide fan 62; then turn on the return air fan, the first fan, and the second fan, and close the third damper 43 and the fourth damper 44.

[0063] After running for a period of time, the temperature value T1 of the first temperature sensor and the temperature value T2 of the second temperature sensor are obtained, and the opening and closing of each fan and the damper are controlled according to the temperature value T1 and the temperature value T2 to make the temperature of the cold storage compartment 1 uniform.

[0064] In a specific embodiment, controlling the opening and closing of each fan and damper based on temperature values ​​T1 and T2 involves several control scenarios, as detailed below:

[0065] When T1≤L1, T2≤L2, and T1-T2≤|a|, where L1 and L2 are preset values ​​(the specific values ​​can be set according to the temperature setting of the refrigerator), and a is the preset deviation; control the split fan 5, upper guide fan 61, and lower guide fan 62 to stop, as detailed below. Figure 3 As shown.

[0066] At this point, the temperature difference between the upper and lower parts of the cold storage compartment 1 is small and close to the preset value, indicating that it is no longer necessary to continue blowing cold air into the cold storage compartment 1, so the three fans can be stopped. In a specific embodiment, 'a' can be 1.

[0067] When T1≤L1, T2≤L2, and T1-T2≤|a|, where L1 and L2 are preset values ​​and a is a preset deviation; control the flow divider fan 5, the upper guide fan 61, and the lower guide fan 62 to stop.

[0068] When T1>L1, T2≤L2, where L1 and L2 are preset values; control the upper guide fan 61 to rotate forward to maintain air outlet, the lower guide fan 62 to rotate in reverse to draw air in, and close the second air door 42, the third air door 43 and the return air door 45, and open the first air door 41 and the fourth air door 44.

[0069] Specifically, such as Figure 4 , 5 As shown, if T1 is too large, it indicates that the upper temperature of the cold storage compartment 1 is high, requiring continuous cold air input. At the same time, to prevent the lower temperature of the cold storage compartment 1 from continuing to drop and causing a larger temperature difference, the lower guide fan 62 reverses to draw air in. The air path in the cold storage compartment 1 is that the upper guide fan 61 blows air into the cold storage compartment 1, while the lower guide fan 62 draws air from the lower part of the cold storage compartment 1, and then returns the air through the second return air duct 8 on the mask. This allows the upper and lower parts of the cold storage compartment 1 to have strong convection through the guide fans, so that the upper part of the cold storage compartment 1 is cooled down without causing the lower part to continue to drop in temperature.

[0070] When T1 > L1 and T2 > L2, where L1 and L2 are preset values, control the flow divider fan 5, the upper guide fan 61, and the lower guide fan 62 to maintain forward rotation.

[0071] That is, Figure 4 As shown, the overall temperature in the refrigerator compartment 1 is too high at this time, and it is necessary to continue to cool down the whole. Therefore, the status of each air vent and the air guide fan should be kept unchanged, that is, the refrigerator should be kept on.

[0072] When T1≤L1, T2>L2, where L1 and L2 are preset values; control the lower guide fan 62 to rotate forward to maintain air outlet, the upper guide fan 61 to rotate in reverse to draw air in, and close the first air door 41, the fourth air door 44 and the return air door 45, and open the second air door 42 and the third air door 43.

[0073] Specifically, such as Figure 6 , 7 As shown, if T2 is too large, it indicates that the temperature in the lower part of the cold storage compartment 1 is high, requiring continuous cold air input. At the same time, to prevent the temperature in the upper part of the cold storage compartment 1 from continuing to drop and causing a larger temperature difference, the upper guide fan 61 reverses to draw air in. The air path in the cold storage compartment 1 is that the lower guide fan 62 blows air into the cold storage compartment 1, while the upper guide fan 61 draws air from the upper part of the cold storage compartment 1 and then returns the air through the first return air duct 7 on the mask. This allows the upper and lower parts of the cold storage compartment 1 to have strong convection through the guide fans, so that the lower part of the cold storage compartment 1 is cooled down without causing the upper part to continue to drop in temperature.

[0074] This invention determines whether the temperature inside the chamber is uniform by detecting the temperature value of sensors arranged above and below the mask. If it is not uniform, it judges the difference between the upper and lower parts and the set value. At this time, it closes the air damper at the bottom of the mask and changes the direction of the DC fan above or below to control the flow direction of cold air and hot air, thereby adjusting the uniformity of the temperature inside the chamber.

[0075] It should be noted that the terminology used above is for describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0076] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0077] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0078] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0079] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling a refrigerator, characterized in that, The refrigerator is divided into a refrigerator compartment and an evaporator compartment located on the back side of the refrigerator compartment by a cover. The bottom of the cover has a return air vent connecting the refrigerator compartment and the evaporator compartment. The cover contains a split air duct. A split air outlet is located in the middle of the split air duct, corresponding to one side of the evaporator compartment, and a split air fan is installed in the middle to split airflow in both upward and downward directions. Guide air outlets are located at the upper and lower parts of the split air duct, corresponding to one side of the refrigerator compartment, and an upper guide air fan and a lower guide air fan are respectively installed thereon. When rotating clockwise, air is drawn from the split air duct and blown into the refrigerator compartment. A first air duct is located between the upper guide air fan and the split air fan within the split air duct. The structure includes a door; a second damper is provided between the lower guide fan and the branch fan in the branch air duct; the mask also includes a first return air duct and a second return air duct, the upper part of the first return air duct connects to the upper part of the branch air duct where the upper guide fan is located, and is equipped with a third damper, and the bottom connects to the return air area of ​​the evaporator chamber; the upper part of the second return air duct connects to the bottom of the branch air duct where the lower guide fan is located, and is equipped with a fourth damper, and the bottom connects to the bottom return air area of ​​the evaporator chamber; the return air inlet is equipped with a return air damper; a first temperature sensor and a second temperature sensor are respectively provided in the upper and lower parts of the cold storage compartment; The refrigerator control method includes the following steps: The refrigerator is plugged in; Control the opening of the diversion fan, upper guide fan, and lower guide fan, and open the return air damper, first damper, and second damper. Close the third and fourth air doors; The temperature value T1 of the first temperature sensor and the temperature value T2 of the second temperature sensor are obtained. Based on the temperature values ​​T1 and T2, the opening and closing of each fan and the damper are controlled to make the temperature of the cold storage room uniform. The specific steps for controlling the opening and closing of each fan and damper based on temperature values ​​T1 and T2 include: When T1>L1, T2≤L2, where L1 and L2 are preset values; control the upper guide fan to rotate forward to maintain airflow, and the lower guide fan to rotate in reverse to draw air, and close the second air door, the third air door and the return air door, and open the first air door and the fourth air door.

2. The refrigerator control method as described in claim 1, characterized in that, The specific steps for controlling the opening and closing of each fan and damper based on temperature values ​​T1 and T2 include: When T1≤L1, T2≤L2, and T1-T2≤|a|, where L1 and L2 are preset values ​​and a is a preset deviation; control the shutdown of the diversion fan, the upper guide fan, and the lower guide fan.

3. The refrigerator control method as described in claim 1, characterized in that, The specific steps for controlling the opening and closing of each fan and damper based on temperature values ​​T1 and T2 include: When T1 > L1 and T2 > L2, where L1 and L2 are preset values, the control of the split fan, upper guide fan, and lower guide fan remains in the state after startup.

4. The refrigerator control method as described in claim 1, characterized in that, The specific steps for controlling the opening and closing of each fan and damper based on temperature values ​​T1 and T2 include: When T1≤L1, T2>L2, where L1 and L2 are preset values; control the lower guide fan to rotate forward to maintain air outlet, the upper guide fan to rotate in reverse to draw air in, and close the first air door, the fourth air door and the return air door, and open the second air door and the third air door.

Images