Air-cooled refrigerator

Abstract

The present invention provides an air-cooled refrigerator, comprising a refrigerator body, an evaporator, an axial flow fan and a damper pivotally connected to the refrigerator body. The refrigerator body defines a refrigeration chamber, a storage chamber, a refrigeration air duct, a return air duct and a defrost air duct, and the refrigeration chamber, the axial flow fan, the refrigeration air duct, the storage chamber and the return air duct are connected end to end in sequence to form a refrigeration circulation air path. The refrigeration chamber, the defrost air duct and the axial flow fan are connected end to end in sequence to form a defrost circulation air path. The air inlet of the defrost air duct is arranged adjacent to the air outlet of the return air duct, and the damper is used to selectively close the air inlet of the defrost air duct and the air outlet of the return air duct. When the axial flow fan rotates forward, the driving gas causes the damper to rotate to a first position that closes the air inlet of the defrost air duct, and causes the gas flowing through the refrigeration chamber to flow in the refrigeration circulation air path. When the axial flow fan rotates reversely, the driving gas causes the damper to rotate to a second position that closes the air outlet of the return air duct, and causes the gas flowing through the refrigeration chamber to flow in the defrost circulation air path.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigerators, and specifically provides an air-cooled refrigerator. Background Art

[0002] Existing air-cooled refrigerators generally have a refrigeration chamber, a refrigeration duct, a storage chamber, and a return air duct that are connected in sequence. Existing air-cooled refrigerators also have an evaporator and a fan. The evaporator is arranged in the refrigeration chamber to cool the air in the refrigeration chamber. The fan is used to drive the air to circulate along the path of the refrigeration chamber, the refrigeration duct, the storage chamber, and the return air duct, so as to transport the gas cooled by the evaporator in the refrigeration chamber to the storage chamber to cool the stored items in the storage chamber (including food, medicines, drinks, biological reagents, bacterial colonies, chemical reagents, etc.).

[0003] Since the items stored in the storage room often include food with a high moisture content, and the water vapor from the outside will enter the storage room, resulting in a high humidity in the storage room, and the water vapor will form frost attached to the evaporator when it encounters cold at the evaporator. When there is a lot of frost on the evaporator, it will affect the cooling effect of the evaporator on the surrounding air, so the evaporator needs to be defrosted regularly.

[0004] In the prior art, the fan is usually stopped first, and then the evaporator is heated by an electric heating device. In the process of the electric heating device heating the evaporator, the heat is gradually transferred from point to surface to the entire evaporator, thereby melting the frost on the evaporator. Since it takes a certain amount of time for the heat to be transferred to the entire evaporator, the defrosting time of the evaporator is long and the defrosting efficiency is low. Summary of the invention

[0005] An object of the present invention is to provide a new air-cooled refrigerator to improve the defrosting efficiency of the evaporator of the air-cooled refrigerator.

[0006] To achieve the above-mentioned purpose, the present invention provides an air-cooled refrigerator, comprising a refrigerator body, an evaporator, an axial-flow fan and a damper pivotally connected to the refrigerator body, wherein the refrigerator body defines a refrigeration chamber, a storage chamber, a refrigeration air duct, a return air duct and a defrost air duct, wherein the refrigeration chamber, the axial-flow fan, the refrigeration air duct, the storage chamber and the return air duct are connected end to end in sequence to form a refrigeration circulation air path; the refrigeration chamber, the defrost air duct and the axial-flow fan are connected end to end in sequence to form a defrost circulation air path; the air inlet of the defrost air duct The air inlet of the defrost air duct is arranged adjacent to the air outlet of the return air duct, and the damper is used to selectively close the air inlet of the defrost air duct and the air outlet of the return air duct; when the axial flow fan rotates forward, the driving gas causes the damper to rotate to a first position for closing the air inlet of the defrost air duct, and the gas flowing through the refrigeration chamber flows in the refrigeration circulation air path; when the axial flow fan rotates reversely, the driving gas causes the damper to rotate to a second position for closing the air outlet of the return air duct, and the gas flowing through the refrigeration chamber flows in the defrost circulation air path.

[0007] Optionally, the damper includes a first damper portion, a second damper portion and a pivot portion located between the first damper portion and the second damper portion, the first damper portion is used to close the air inlet of the defrost air duct, the second damper portion is used to close the air outlet of the return air channel, and the damper is pivotally connected to the refrigerator body through the pivot portion.

[0008] Optionally, the air inlet of the defrost air duct is located on the upper side of the air outlet of the return air channel, so that the damper closes the air outlet of the return air channel through the second damper part under the action of its own gravity.

[0009] Optionally, the size of the air inlet of the defrost air duct is smaller than the size of the air outlet of the return air channel; and / or, the extended surface of the first damper portion is smaller than the extended surface of the second damper portion.

[0010] Optionally, the damper is a V-shaped sheet structure made of lightweight material.

[0011] Optionally, the axial flow fan is configured such that the rotation speed during reverse rotation increases as the temperature inside the refrigeration chamber increases.

[0012] Optionally, the air-cooled refrigerator further includes a heating device, and the heating device is arranged above the evaporator.

[0013] Optionally, the axial flow fan is arranged obliquely above the heating device.

[0014] Optionally, the top surface of the evaporator is tilted so that the gas blown out from the reversed axial flow fan is blown vertically toward the top surface; and / or, the heating device is parallel to the top surface of the evaporator.

[0015] Optionally, the refrigerator body includes an air duct cover plate, the refrigeration air duct and the defrost air duct are both formed on the air duct cover plate, and the air door is installed on the air duct cover plate.

[0016] Based on the foregoing description, those skilled in the art will understand that, in the aforementioned technical solution of the present invention, an air-cooled refrigerator is formed by forming a refrigeration circulation air circuit in which the refrigeration chamber, the axial flow fan, the refrigeration air duct, the storage chamber and the return air duct are connected end to end in sequence, and a defrost circulation air circuit in which the refrigeration chamber, the defrost air duct and the axial flow fan are connected end to end in sequence is formed, and the forward-rotating axial flow fan forces the damper to rotate to a first position that closes the air inlet of the defrost air duct, so that the gas flowing through the refrigeration chamber flows in the refrigeration circulation air circuit to cool the stored objects in the storage chamber; and the reverse axial flow fan forces the damper to rotate to a second position that closes the air outlet of the return air duct, so that the gas flowing through the refrigeration chamber flows in the defrost circulation air circuit to assist in defrosting the evaporator. Specifically, when the axial flow fan is reversed, the high-temperature gas in the defrosting circulation air path can be forced to continuously blow and flow through the evaporator, so that each part of the evaporator is evenly heated. Compared with the evaporator transferring heat to the whole body through its own heat transfer, the evaporator can be evenly and quickly heated, and the frost on the evaporator can be quickly removed, thereby improving the defrosting effect of the evaporator. At the same time, the flowing gas can also promote the frost and frost-water mixture to separate from the evaporator, further improving the defrosting effect of the evaporator.

[0017] In addition, by controlling the damper through the forward and reverse rotation of the axial flow fan to selectively close the air inlet of the defrost air duct and the air outlet of the return air duct, the control logic of the air-cooled refrigerator is relatively simple and the production cost is low.

[0018] Furthermore, by increasing the speed of the axial flow fan as the temperature of the refrigeration chamber rises, the gas flow rate in the defrost circulation air path increases as the speed of the axial flow fan increases. Since the gas pressure decreases as the flow rate increases, the air pressure in the defrost circulation air path can be reduced by increasing the speed of the axial flow fan, so that the air pressure in the defrost circulation air path is slightly lower than the air pressure in the storage chamber, thereby preventing the high-temperature gas in the defrost circulation air path from entering the storage chamber, thereby preventing the storage chamber from experiencing a temperature rise when the evaporator is defrosted.

[0019] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, some embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that the same reference numerals indicate the same or similar components or parts in different drawings; the drawings of the present invention are not necessarily drawn to scale.

[0021] In the attached figure:

[0022] Figure 1 is a schematic diagram of the principle of an air-cooled refrigerator in some embodiments of the present invention (refrigeration mode);

[0023] Figure 2 is a schematic diagram of the principle of an air-cooled refrigerator in some embodiments of the present invention (defrost mode);

[0024] Figure 3 is a schematic diagram of a first axonometric effect of an air duct cover plate portion in some embodiments of the present invention;

[0025] Figure 4 is a second isometric effect schematic diagram of the air duct cover plate portion in some embodiments of the present invention;

[0026] Figure 5 yes Figure 4 A cross-sectional view of the middle air duct cover along the AA direction;

[0027] Figure 6 yes Figure 4 A cross-sectional view of the middle air duct cover along the BB direction;

[0028] Figure 7 It is a schematic diagram of the structural effect of the damper in some embodiments of the present invention. DETAILED DESCRIPTION

[0029] It should be understood by those skilled in the art that the embodiments described below are only some embodiments of the present invention, rather than all embodiments of the present invention, and these embodiments are intended to explain the technical principles of the present invention, rather than to limit the protection scope of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should still fall within the protection scope of the present invention.

[0030] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Furthermore, it should be noted that, for the convenience of description and to enable those skilled in the art to quickly understand the technical solution of the present invention, the following text only describes the technical features that are strongly related (directly or indirectly related) to the technical problem and / or technical concept to be solved by the present invention, and does not describe the technical features that are weakly related to the technical problem and / or technical concept to be solved by the invention. Since the technical features with a weaker degree of correlation belong to the common knowledge in the field, even if the present invention does not describe the features with a weaker degree of correlation, it will not lead to insufficient disclosure of the present invention.

[0033] like Figure 1 and Figure 2 As shown, in some embodiments of the present invention, an air-cooled refrigerator includes a refrigerator body 1, an evaporator 2, an axial flow fan 3, a heating device 4 and a damper 5.

[0034] Continue reading Figure 1 and Figure 2 The refrigerator body 1 is defined with a refrigeration chamber 101, a storage chamber 102, a refrigeration air duct 103, a return air duct 104 and a defrost air duct 105. The refrigeration chamber 101, the axial flow fan 3, the refrigeration air duct 103, the storage chamber 102 and the return air duct 104 are connected end to end in sequence, thereby forming a refrigeration circulation air path (not marked in the figure). The refrigeration chamber 101, the defrost air duct 105 and the axial flow fan 3 are connected end to end in sequence, thereby forming a defrost circulation air path (not marked in the figure).

[0035] like Figure 1As shown, when the air-cooled refrigerator operates in the refrigeration mode, the gas circulates in the refrigeration circulation air path, and the gas flow path is: refrigeration chamber 101 → axial flow fan 3 → refrigeration air duct 103 → storage chamber 102 → return air duct 104 → refrigeration chamber 101.

[0036] like Figure 2 As shown, when the air-cooled refrigerator operates in the defrost mode, the gas circulates in the defrost circulation air path, and the gas flow path is: refrigeration chamber 101 → defrost air duct 105 → axial flow fan 3 → refrigeration chamber 101.

[0037] Continue reading Figure 1 and Figure 2 The refrigerator body 1 includes an air duct cover plate 110 , and the refrigeration air duct 103 and the defrosting air duct 105 are both formed on the air duct cover plate 110 .

[0038] like Figures 1 to 6 As shown, the air outlet of the refrigeration air duct 103 (referred to as the first air outlet 1031) is arranged at the front side of the air duct cover plate 110, so that the refrigeration air duct 103 blows the cold air into the storage chamber 102 through the first air outlet 1031. The air inlet of the defrost air duct 105 (referred to as the third air inlet 1051) is arranged at the rear side of the air duct cover plate 110, so that the defrost air duct 105 receives the gas in the refrigeration chamber 101 through the third air inlet 1051.

[0039] Continue reading Figure 1 and Figure 2 The air inlet (the third air inlet 1051) of the defrost air duct 105 is arranged adjacent to the air outlet (recorded as the second air inlet 1041) of the return air duct 104, and the third air inlet 1051 of the defrost air duct 105 is located on the upper side of the second air inlet 1041 of the return air duct 104, so that the damper 5 closes the second air inlet 1041 of the return air duct 104 under the action of its own gravity.

[0040] like Figure 5 and Figure 6 As shown, in some embodiments of the present invention, there are two refrigeration air ducts 103 and one defrost air duct 105, and the defrost air duct 105 is located between the two refrigeration air ducts 103, so that the flow cross-sectional area of ​​the refrigeration air duct 103 is as large as possible, so as to reduce the resistance of the refrigeration air duct 103 to the gas.

[0041] Return to continue reading Figure 1 and Figure 2 The evaporator 2 is arranged in the refrigeration chamber 101 , and the evaporator 2 is located between the two ends of the defrost air duct 105 .

[0042] like Figure 1 , Figure 2 and Figure 4As shown, the axial flow fan 3 is arranged above the evaporator 2 to drive the gas flow so that the gas flows in the refrigeration cycle air path or the defrost cycle air path. Specifically, the axial flow fan 3 is arranged obliquely above the evaporator 2 and close to the evaporator 2. The angle between the axial flow fan 3 (specifically the rotation axis of the impeller of the axial flow fan 3) and the horizontal plane is 0°-45°, such as 5°, 15°, 30°, 45°, etc. Further, the top surface of the evaporator 2 is inclined so that the gas blown out from the reversed axial flow fan 3 is blown vertically to the top surface of the evaporator 2, thereby allowing the gas to evenly pass through the gaps on the evaporator 2. The situation of uneven distribution of the air flow passing through the evaporator 2 is avoided, that is, the situation in which the gas flow rate in a part of the gaps in the evaporator 2 is faster and the gas flow rate in another part of the air is slower is avoided.

[0043] like Figure 1 As shown, when the air-cooled refrigerator is running in the refrigeration mode, the axial flow fan 3 rotates forward, driving the gas along Figure 1 Flow in the direction indicated by the arrow.

[0044] like Figure 2 As shown, when the air-cooled refrigerator is running in the defrosting mode, the axial flow fan 3 is reversed to drive the gas along Figure 2 Flow in the direction indicated by the arrow.

[0045] like Figure 1 and Figure 2 As shown, the heating device 4 is optionally arranged on the top of the evaporator 2, so that the reverse axial flow fan 3 conveys the gas heated by the heating device 4 downward and blows the evaporator 2, so that each part of the evaporator 2 is evenly heated. Preferably, the heating device 4 is located on the upper side of the evaporator 2, and there is a gap between the heating device 4 and the evaporator 2, so that the heating device 4 can fully heat the gas flowing through it. Further preferably, the heating device 4 is substantially parallel to the top surface of the evaporator 2.

[0046] In addition, in other embodiments of the present invention, those skilled in the art may also dispose the heating device 4 at other positions of the evaporator 2 as required, such as disposing the heating device 4 at the bottom or middle of the evaporator 2, or disposing the heating device 4 at various positions of the evaporator 2. However, disposing the heating device 4 at other positions of the evaporator 2 may increase the power consumption of the heating device 4 or reduce the heating efficiency of the evaporator 2.

[0047] Furthermore, the heating device 4 is preferably an electric heating device, such as an electric heating wire. In addition, those skilled in the art may also configure the heating device 4 to be any other feasible heating device as required, such as a condenser disposed at the bottom side of the evaporator 2, or using a part or all of the evaporator 2 as a condenser during the defrosting process of the evaporator 2.

[0048] like Figure 1-Figure 4 , Figure 6 and Figure 7 As shown, the damper 5 is pivotally mounted on the air duct cover 110 , and is used to selectively close the third air inlet 1051 of the defrost air duct 105 and the second air inlet 1041 of the return air channel 104 .

[0049] like Figure 4 and Figure 7 As shown, the damper 5 includes a first damper portion 51, a second damper portion 52, and a pivot portion 53 located between the first damper portion 51 and the second damper portion 52. The first damper portion 51 is used to close the third air inlet 1051 of the defrost air duct 105, the second damper portion 52 is used to close the second air outlet 1041 of the return air duct 104, and the damper 5 is pivotally connected to the air duct cover plate 110 through the pivot portion 53.

[0050] from Figure 4 and Figure 7 It can be seen that the extension surface of the first damper portion 51 is smaller than the extension surface of the second damper portion 52, so that the first damper portion 51 is adapted to the third air inlet 1051 of the defrost duct 105, and the second damper portion 52 is adapted to the second air outlet 1041 of the return air duct 104.

[0051] from Figure 1 , Figure 2 , Figure 4 and Figure 7 It can be seen that the damper 5 is generally a V-shaped sheet structure. Preferably, the damper 5 is a V-shaped sheet structure made of a lightweight material, so that the airflow blown out from the second air outlet 1041 of the return air channel 104 can drive the damper 5 to flip upward, and the damper 5 closes the third air inlet 1051 of the defrost air channel 105 through the first damper portion 51. The V-shaped structure of the damper 5 also enables the damper 5 to close the second air outlet 1041 of the return air channel 104 through the second damper portion 52 under the action of its own gravity.

[0052] Refer to the following Figure 1 and Figure 2 The working principle of the air-cooled refrigerator of the present invention is briefly described.

[0053] like Figure 1 As shown, when the air-cooled refrigerator is running in the refrigeration mode, the axial flow fan 3 rotates forward and drives the gas to Figure 1 The air door 5 is turned upward under the action of the air flow to the first position where the first air door portion 51 closes the third air inlet 1051 of the defrost air duct 105, and the second air outlet 1041 of the return air duct 104 is opened. At this time, the circulation path of the air flow is: refrigeration chamber 101 → axial flow fan 3 → refrigeration air duct 103 → storage chamber 102 → return air duct 104 → refrigeration chamber 101.

[0054] like Figure 2 As shown, when the air-cooled refrigerator is running in the defrosting mode, the axial flow fan 3 is reversed and drives the gas along Figure 2 The air door 5 turns downward under the action of its own gravity and airflow to the second position where the second air door portion 52 closes the second air outlet 1041 of the return air channel 104, and the third air inlet 1051 of the defrost air channel 105 is opened. At this time, the circulation path of the airflow is: refrigeration chamber 101 → defrost air channel 105 → axial flow fan 3 → refrigeration chamber 101.

[0055] It is understood by those skilled in the art that, because the damper 5 can be turned downward under its own gravity to the second position (such as the second position where the second damper portion 52 closes the second air outlet 1041 of the return air channel 104), Figure 2 As shown in the figure, when the axial flow fan 3 just starts to rotate forward, part of the air flow will still flow in the defrosting circulation air path, but the circulation path of the air flow at this time is: refrigeration chamber 101 → axial flow fan 3 → defrosting air duct 105 → refrigeration chamber 101. As the speed of the axial flow fan 3 increases and as the air pressure in the return air duct 104 increases, the damper 5 is forced to turn upward until the damper 5 turns to Figure 1 Therefore, the air-cooled refrigerator of the present invention requires that the axial flow fan 3 should not be lower than a certain speed when rotating forward, otherwise the air door 5 will not be able to flip to the first position. Figure 1 The first position shown in the figure causes a waste of cooling capacity (part of the gas flows in the defrosting circulation air path). The certain rotation speed can be used at the beginning of the design of the air-cooled refrigerator by gradually increasing the rotation speed of the axial flow fan 3 when it rotates forward to observe the posture of the damper 5 and force the damper 5 to flip to Figure 1 The rotation speed at the first position is shown as the certain rotation speed.

[0056] Based on the foregoing description, those skilled in the art can understand that the present invention enables the damper 5 to close the third air inlet 1051 of the defrost air duct 105 or the second air outlet 1041 of the return air duct 104 through the forward / reverse rotation of the axial flow fan 3, so that the damper 5 closes the defrost circulation air path or the refrigeration circulation air path; enables the axial flow fan 3 to drive the gas to flow in the refrigeration circulation air path when it rotates forward, thereby ensuring the refrigeration function of the air-cooled refrigerator; and enables the axial flow fan 3 to drive the gas to flow in the defrost circulation air path when it rotates reversely, thereby assisting in defrosting the evaporator 2 of the air-cooled refrigerator. In short, the present invention can enable the air-cooled refrigerator to perform refrigeration or defrost only by controlling the forward / reverse rotation of the axial flow fan 3, and the control logic is simple.

[0057] In addition, during defrosting, in order to prevent the high-temperature gas in the refrigerating chamber 101 from entering the storage chamber 102, in other embodiments of the present invention, those skilled in the art may also increase the speed of the axial flow fan 3 when it is reversed as the temperature in the refrigerating chamber 101 increases as needed. Those skilled in the art will understand that as the speed of the axial flow fan 3 increases, the flow rate of the gas in the defrosting circulation air path also increases, thereby increasing the negative pressure upstream of the axial flow fan 3 and in the refrigerating air duct 103, and then making the air pressure in the refrigerating air duct 103 slightly lower than the air pressure in the storage chamber 102, effectively preventing the high-temperature gas from entering the storage chamber 102, and then preventing the storage chamber 102 from experiencing a temperature rise.

[0058] So far, the technical solution of the present invention has been described in combination with the above multiple embodiments, but it is easy for those skilled in the art to understand that the protection scope of the present invention is not limited to these specific embodiments. Without departing from the technical principles of the present invention, those skilled in the art can split and combine the technical solutions in the above embodiments, and can also make equivalent changes or replacements to the relevant technical features. Any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principles of the present invention will fall within the protection scope of the present invention.

Claims

1. An air-cooled refrigerator, comprising a refrigerator body, an evaporator, an axial flow fan and a damper pivotally connected to the refrigerator body, The refrigerator body is defined with a refrigeration chamber, a storage chamber, a refrigeration air duct, a return air duct and a defrost air duct. The refrigeration chamber, the axial flow fan, the refrigeration air duct, the storage chamber and the return air duct are connected end to end in sequence to form a refrigeration circulation air path; The refrigeration chamber, the defrost air duct and the axial flow fan are connected end to end in sequence to form a defrost circulation air path; The air inlet of the defrost air duct is arranged adjacent to the air outlet of the return air duct, and the damper is used to selectively close the air inlet of the defrost air duct and the air outlet of the return air duct; When the axial flow fan rotates forward, the driving gas causes the damper to rotate to a first position that closes the air inlet of the defrost air duct, and causes the gas flowing through the refrigeration chamber to flow in the refrigeration circulation air path; When the axial flow fan is reversed, the driving gas causes the damper to rotate to a second position closing the air outlet of the return air channel, and causes the gas flowing through the refrigeration chamber to flow in the defrosting circulation air path; in, The damper includes a first damper portion, a second damper portion and a pivot portion located between the first damper portion and the second damper portion, the first damper portion is used to close the air inlet of the defrost air duct, the second damper portion is used to close the air outlet of the return air channel, and the damper is pivotally connected to the refrigerator body through the pivot portion.

2. The air-cooled refrigerator according to claim 1, wherein: The air inlet of the defrost air duct is located on the upper side of the air outlet of the return air duct, so that the air door closes the air outlet of the return air duct through the second air door part under the action of its own gravity.

3. The air-cooled refrigerator according to claim 2, wherein: The size of the air inlet of the defrost air duct is smaller than the size of the air outlet of the return air duct; and / or, An extended surface of the first damper portion is smaller than an extended surface of the second damper portion.

4. The air-cooled refrigerator according to any one of claims 1 to 3, wherein: The air door is a V-shaped sheet structure made of light material.

5. The air-cooled refrigerator according to any one of claims 1 to 3, wherein: The axial flow fan is configured such that the rotation speed thereof during reverse rotation increases as the temperature inside the refrigeration chamber increases.

6. The air-cooled refrigerator according to any one of claims 1 to 3, wherein: The air-cooled refrigerator further includes a heating device, which is arranged above the evaporator.

7. The air-cooled refrigerator according to claim 6, wherein: The axial flow fan is arranged obliquely above the heating device.

8. The air-cooled refrigerator according to claim 7, wherein: The top surface of the evaporator is tilted so that the gas blown out from the reversed axial flow fan is blown vertically toward the top surface; and / or, The heating device is parallel to the top surface of the evaporator.

9. The air-cooled refrigerator according to any one of claims 1 to 3, wherein: The refrigerator body comprises an air duct cover plate, the refrigeration air duct and the defrost air duct are both formed on the air duct cover plate, and the air door is installed on the air duct cover plate.

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