Air-cooled refrigeration equipment

Abstract

The present invention belongs to the technical field of refrigeration equipment, and specifically provides an air-cooled refrigeration equipment. The present invention aims to solve the problem of low defrosting efficiency of existing air-cooled refrigeration equipment when defrosting the evaporator. The air-cooled refrigeration equipment of the present invention includes an equipment body, an evaporator and an axial flow fan. The equipment body is defined by a refrigeration chamber, a storage chamber, a refrigeration air duct, a return air duct and a defrost air duct. The refrigeration chamber, 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 two ends of the defrost air duct are respectively connected to the refrigeration chamber to form a defrost circulation air path. The evaporator is arranged in the refrigeration chamber and is located between the two ends of the defrost air duct. The forward-rotating axial flow fan drives the gas flowing through the refrigeration chamber to flow in the refrigeration circulation air path, and the reverse-rotating axial flow fan drives the gas flowing through the refrigeration chamber to flow in the defrost circulation air path. The present invention not only improves the defrosting effect of the evaporator, but also simplifies the control logic.

Description

Technical Field

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

[0002] Air-cooled refrigeration equipment mainly includes air-cooled refrigeration equipment, air-cooled freezers, and air-cooled ice chests. Existing air-cooled refrigeration equipment generally has a refrigeration chamber, a refrigeration duct, a storage chamber, and a return air duct that are connected in sequence. Existing air-cooled refrigeration equipment also has 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, alcohol, biological reagents, bacterial colonies, chemical reagents, etc.).

[0003] Because the items stored in the storage room often include food with a high moisture content, and moisture from the outside will enter the storage room, resulting in high humidity in the storage room. When the moisture is cooled at the evaporator, it will form frost that adheres to the evaporator. When there is a lot of frost on the evaporator, it will affect the evaporator's cooling effect on the surrounding air, so the evaporator needs to be defrosted regularly.

[0004] In existing technology, the fan is typically stopped before the evaporator is heated by an electric heater. During this heating process, heat is gradually transferred from point to point throughout the evaporator, melting the frost. Because heat transfer to the entire evaporator takes time, the defrost time is long and the defrost efficiency is low. Summary of the Invention

[0005] An object of the present invention is to solve the problem of low defrosting efficiency when defrosting an evaporator in existing air-cooled refrigeration equipment.

[0006] A further object of the present invention is to balance the air pressure in the refrigeration chamber before defrosting the air-cooled device to prevent the air pressure in the refrigeration chamber from being too high or too low.

[0007] To achieve the above object, the present invention provides an air-cooled refrigeration device, comprising:

[0008] The device body is defined as a refrigeration chamber, a storage chamber, a refrigeration air duct, a return air duct, and a defrost air duct, wherein the refrigeration chamber, the refrigeration air duct, the storage chamber, and the return air duct are sequentially connected end to end to form a refrigeration circulation air path; both ends of the defrost air duct are respectively connected to the refrigeration chamber to form a defrost circulation air path;

[0009] an evaporator disposed in the refrigeration chamber and located between the two ends of the defrost air duct;

[0010] The axial flow fan, the forward-rotating axial flow fan drives the gas flowing through the refrigeration chamber to flow in the refrigeration circulation air path, and the reverse-rotating axial flow fan drives the gas flowing through the refrigeration chamber to flow in the defrost circulation air path.

[0011] Optionally, the axial flow fan is arranged obliquely above the evaporator.

[0012] Optionally, the angle between the axial flow fan and the horizontal plane is 0°-45°; and / or, the top surface of the evaporator is tilted so that the gas blown out from the reversed axial flow fan blows vertically toward the top surface.

[0013] Optionally, the air-cooled refrigeration equipment further includes a refrigeration valve assembly and a defrost valve assembly, the refrigeration valve assembly is used to block the refrigeration circulation air path, and the defrost valve assembly is used to block the defrost circulation air path.

[0014] Optionally, the refrigeration valve assembly includes a first one-way valve and / or a second one-way valve, the first one-way valve is used to unidirectionally block the refrigeration air duct, the first one-way valve only allows the forward rotating axial flow fan to drive the gas to flow through the refrigeration air duct, but does not allow the reverse rotating axial flow fan to drive the gas to flow through the refrigeration air duct; the second one-way valve is used to unidirectionally block the return air channel, the second one-way valve only allows the forward rotating axial flow fan to drive the gas to flow through the return air channel, but does not allow the reverse rotating axial flow fan to drive the gas to flow through the return air channel.

[0015] Optionally, each air outlet of the refrigeration air duct is respectively provided with a first one-way valve; the air inlet or the air outlet of the return air channel is provided with the second one-way valve.

[0016] Optionally, the defrost valve assembly includes a third one-way valve, which is used to unidirectionally block the defrost air duct. The third one-way valve only allows the reversed axial flow fan to drive the gas to flow through the defrost air duct, but does not allow the forward rotating axial flow fan to drive the gas to flow through the defrost air duct.

[0017] Optionally, the first one-way valve, the second one-way valve and the third one-way valve are all thin plates pivotally connected to the device body, and the pivot axis of each of the thin plates is located at the top of the corresponding thin plate, so that the first one-way valve, the second one-way valve and the third one-way valve can be closed under the action of their own gravity.

[0018] Optionally, the device body is limited to two refrigeration ducts and one defrost duct, and the defrost duct is located between the two refrigeration ducts; and / or, the reverse rotation speed of the axial flow fan is 1 / 4-3 / 4 of the forward rotation speed; and / or, a pressure equalizing channel is provided on the device body, and the pressure equalizing channel is connected to the refrigeration chamber through one end thereof, and the pressure equalizing channel leads to the outside of the air-cooled refrigeration device through the other end thereof; and / or, the device body includes an air duct cover plate, and the refrigeration duct and the defrost duct are both formed on the air duct cover plate.

[0019] Optionally, the air-cooled refrigeration equipment further includes a heating device, which is arranged on the top of the evaporator.

[0020] Based on the foregoing description, those skilled in the art will understand that, in the aforementioned technical solution of the present invention, a refrigeration circulation air path is formed by connecting the refrigeration chamber, the refrigeration air duct, the storage chamber and the return air duct end to end in sequence; the two ends of the defrost air duct are respectively connected to the refrigeration chamber to form a defrost circulation air path; and the forward-rotating axial flow fan drives the gas flowing through the refrigeration chamber to flow in the refrigeration circulation air path, and the reverse-rotating axial flow fan drives the gas flowing through the refrigeration chamber to flow in the defrost circulation air path; so that the air-cooled refrigeration equipment of the present invention can cool the stored objects in the storage chamber by rotating the axial flow fan forward, and defrost the evaporator in the refrigeration chamber by reversing the axial flow fan. Specifically, when defrosting the evaporator, the air-cooled refrigeration device of the present invention enables the axial flow fan to continuously blow air across the evaporator through the defrost circulation air path, uniformly heating all parts of the evaporator. Compared to transferring heat throughout the evaporator through its own heat transfer, the evaporator is heated uniformly and quickly, rapidly removing frost from the evaporator and thereby improving the defrosting effect of the evaporator. Furthermore, the flowing air facilitates the separation of frost and frost-water mixture from the evaporator, further enhancing the defrosting effect of the evaporator.

[0021] Furthermore, by using the first one-way valve to one-way block the cooling air duct, the second one-way valve to one-way block the return air duct, and the third one-way valve to one-way block the defrost air duct, the air-cooled refrigeration device can be operated for cooling or defrosting simply by controlling the forward and reverse rotation of the axial flow fan, resulting in simple control logic. Furthermore, when the air-cooled refrigeration device defrosts the evaporator, the first and second one-way valves prevent high-temperature air in the refrigeration chamber from entering the storage compartment and causing a temperature rise in the storage compartment. When the air-cooled refrigeration device is cooling the storage compartment, they also prevent cold air from circulating ineffectively within the defrost circulation air path, thereby ensuring the cooling efficiency of the air-cooled refrigeration device.

[0022] Furthermore, the refrigeration chamber is connected to the external environment through a pressure equalization channel, so that the air pressure in the refrigeration chamber can be balanced through the pressure equalization channel. That is, when the air-cooled refrigeration equipment defrosts the evaporator, when the air pressure in the refrigeration chamber is too high, the air in the refrigeration chamber is discharged to the external environment through the pressure equalization channel. When the pressure is too low, the air in the refrigeration chamber is drawn in from the external environment through the pressure equalization channel.

[0023] Furthermore, by arranging the axial flow fan obliquely above the evaporator, the reversed axial flow fan blows the gas from top to bottom toward the evaporator, which promotes defrosting and falling of water on the evaporator and shortens the defrosting time of the air-cooled refrigeration equipment.

[0024] 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

[0025] 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 in different drawings indicate the same or similar components or parts; and the drawings of the present invention are not necessarily drawn to scale.

[0026] In the attached figure:

[0027] Figure 1 is a schematic diagram of the principle of an air-cooled refrigeration device in some embodiments of the present invention (refrigeration mode);

[0028] Figure 2 is a schematic diagram of the principle of an air-cooled refrigeration device in some embodiments of the present invention (defrost mode);

[0029] Figure 3 is a first isometric effect schematic diagram of the air duct cover portion in some embodiments of the present invention;

[0030] Figure 4 is a second isometric effect diagram of the air duct cover portion in some embodiments of the present invention;

[0031] Figure 5 yes Figure 4 Cross-sectional view of the middle air duct cover along the AA direction;

[0032] Figure 6 yes Figure 4 Cross-sectional view of the middle air duct cover along direction BB. DETAILED DESCRIPTION

[0033] 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 that these embodiments are intended to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those skilled in the art without creative effort should still fall within the scope of protection of the present invention.

[0034] It should be noted that in the description of the present invention, terms such as "center," "upper," "lower," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] 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 closely 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 less closely related to the technical problem and / or technical concept to be solved by the invention. Since such technical features with a lesser degree of relevance are common knowledge in the field, even if the present invention does not describe such features with a lesser degree of relevance, it will not result in insufficient disclosure of the present invention.

[0037] like Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the air-cooled refrigeration equipment includes an equipment body 1, an evaporator 2, an axial flow fan 3, a heating device 4, a refrigeration valve assembly 5 and a defrost valve assembly 6.

[0038] Continue reading Figure 1 and Figure 2The appliance body 1 defines a refrigeration chamber 101, a storage chamber 102, a cooling air duct 103, a return air duct 104, and a defrost air duct 105. The refrigeration chamber 101, the cooling air duct 103, the storage chamber 102, and the return air duct 104 are interconnected end-to-end, forming a refrigeration circulation air path. The defrost air duct 105 is connected to the refrigeration chamber 101 at both ends, forming a defrost circulation air path.

[0039] like Figure 1 As shown, when the air-cooled refrigeration equipment operates in the refrigeration mode, the gas circulates in the refrigeration circulation air path, and the gas flow path is: refrigeration chamber 101 → refrigeration air duct 103 → storage chamber 102 → return air channel 104 → refrigeration chamber 101.

[0040] like Figure 2 As shown, when the air-cooled refrigeration equipment 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 → refrigeration chamber 101.

[0041] Continue reading Figure 1 and Figure 2 The device body 1 includes an air duct cover plate 110 , and the cooling air duct 103 and the defrosting air duct 105 are both formed on the air duct cover plate 110 .

[0042] like Figures 1 to 6 As shown, the air outlet 1031 of the cooling air duct 103 is arranged on the front side of the air duct cover 110, so that the cooling air duct 103 blows cold air into the storage chamber 102 through the air outlet 1031. The air inlet 1051 of the defrost air duct 105 is arranged on the rear side of the air duct cover 110, so that the defrost air duct 105 receives air from the refrigeration chamber 101 through the air inlet 1051.

[0043] like Figure 5 and Figure 6 As shown, in some embodiments of the present invention, there are two cooling air ducts 103 and one defrost air duct 105, and the defrost air duct 105 is located between the two cooling air ducts 103 so that the flow cross-sectional area of the cooling air duct 103 is as large as possible, so as to reduce the resistance of the cooling air duct 103 to the gas.

[0044] like Figure 1 and Figure 2 As shown, the evaporator 2 is disposed in the refrigeration chamber 101 , and the evaporator 2 is located between two ends of the defrost air duct 105 .

[0045] 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 circulation air path or the defrost circulation 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 arranged obliquely so that the gas blown out from the reversed axial flow fan 3 blows vertically to the top surface of the evaporator 2, thereby allowing the gas to pass through the gaps on the evaporator 2 evenly. The situation of uneven distribution of the air flow through the evaporator 2 is avoided, that is, the situation in which the gas flow rate in one part of the gaps in the evaporator 2 is faster and the air gas flow rate in another part is slower is avoided.

[0046] like Figure 1 As shown, when the air-cooled refrigeration equipment is running in the cooling mode, the axial flow fan 3 rotates forward, driving the gas along Figure 1 Flow in the direction indicated by the arrow.

[0047] like Figure 2 As shown, when the air-cooled refrigeration equipment is running in the defrost mode, the axial flow fan 3 is reversed to drive the gas along Figure 2 Flow in the direction indicated by the arrow.

[0048] like Figure 1 and Figure 2 As shown, the heating device 4 is optionally provided on top of the evaporator 2 so that the counter-rotating axial flow fan 3 conveys the gas heated by the heating device 4 downward, thereby uniformly heating various parts of the evaporator 2. 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 therethrough.

[0049] Furthermore, in other embodiments of the present invention, those skilled in the art may also dispose the heating device 4 at other locations of the evaporator 2 as needed, such as disposing the heating device 4 at the bottom or middle of the evaporator 2, or disposing the heating device 4 at various locations of the evaporator 2. However, disposing the heating device 4 at other locations of the evaporator 2 may increase the power consumption of the heating device 4 or reduce the heating efficiency of the evaporator 2.

[0050] Furthermore, the heating device 4 is preferably an electric heating device, such as an electric heating wire. Furthermore, those skilled in the art may also configure the heating device 4 as any other feasible heating device as needed, such as a condenser disposed on the bottom side of the evaporator 2, or using part or all of the evaporator 2 as a condenser during the defrosting process of the evaporator 2.

[0051] like Figure 1 and Figure 2As shown, the refrigeration valve assembly 5 is installed on the air duct cover 110 to block the refrigeration circulation air path; the defrost valve assembly 6 is installed on the air duct cover 110 to block the defrost circulation air path.

[0052] like Figures 1 to 3 As shown, the refrigeration valve assembly 5 includes a first one-way valve 51 and a second one-way valve 52. The first one-way valve 51 is used to unidirectionally block the refrigeration air duct 103. Specifically, the first one-way valve 51 only allows the forward-rotating axial flow fan 3 to drive the gas to flow through the refrigeration air duct 103, but does not allow the reverse-rotating axial flow fan 3 to drive the gas to flow through the refrigeration air duct 103. The second one-way valve 52 is used to unidirectionally block the return air duct 104. Specifically, the second one-way valve 52 only allows the forward-rotating axial flow fan 3 to drive the gas to flow through the return air duct 104, but does not allow the reverse-rotating axial flow fan 3 to drive the gas to flow through the return air duct 104.

[0053] Preferably, each air outlet 1031 of the cooling air duct 103 is provided with a first one-way valve 51. Alternatively, in other embodiments of the present invention, those skilled in the art may also provide only one first one-way valve 51 inside or at the inlet end of the cooling air duct 103 as needed.

[0054] Furthermore, the second one-way valve 52 may be disposed at any position of the return air passage 104 , such as at the inlet, outlet, or inside the return air passage 104 .

[0055] Those skilled in the art will appreciate that, since the cooling air duct 103 and the return air duct 104 each constitute part of the refrigeration circulation air path, either the first one-way valve 51 or the second one-way valve 52 can function to unidirectionally block the refrigeration circulation air path. Therefore, in other embodiments of the present invention, those skilled in the art may retain only one of the first one-way valve 51 or the second one-way valve 52 as needed.

[0056] Further preferably, the first and second one-way valves 51, 52 are thin plates pivotally connected to the air duct cover 110, with the pivot axis of each plate located at the top of the corresponding plate, allowing the first and second one-way valves 51, 52 to close under their own weight. The plates are preferably made of a lightweight material so that the first and second one-way valves 51, 52 can be opened by the gas driven by the forward-rotating axial flow fan 3. The material can be any suitable material, such as plastic or silicone.

[0057] In addition, those skilled in the art may also replace the first one-way valve 51 and / or the second one-way valve 52 with a two-way shut-off valve or damper as needed.

[0058] like Figure 1 、 Figure 2 and Figure 6As shown, the defrost valve assembly 6 includes a third one-way valve 61, which is used to unidirectionally block the defrost air duct 105. Specifically, the third one-way valve 61 only allows the reversed axial flow fan 3 to drive the gas to flow through the defrost air duct 105, but does not allow the forward rotating axial flow fan 3 to drive the gas to flow through the defrost air duct 105.

[0059] Preferably, the third one-way valve 61 is disposed at the air inlet 1051 of the defrost duct 105. Alternatively, in other embodiments of the present invention, those skilled in the art may also dispose the third one-way valve 61 at the air outlet of the defrost duct 105 or inside the defrost duct 105 as needed.

[0060] Similarly, further preferably, the third one-way valve 61 is a thin plate pivotally connected to the air duct cover 110, with the pivot axis of the plate located at the top of the plate, so that the third one-way valve 61 can close under its own weight. The plate is preferably made of a lightweight material so that the third one-way valve 61 can be opened by the gas driven by the reverse axial flow fan 3. The material can be any feasible material, such as plastic or silicone. Furthermore, those skilled in the art can also replace the third one-way valve 61 with a two-way shut-off valve or damper as needed.

[0061] Refer to the following Figure 1 and Figure 2 The working principle of the air-cooled refrigeration equipment of the present invention is briefly described.

[0062] like Figure 1 As shown, when the air-cooled refrigeration equipment is running in the cooling mode, the axial flow fan 3 rotates forward and drives the gas along Figure 1 Air flows in the direction indicated by the arrow. The airflow opens the first and second check valves 51 and 52. The third check valve 61 closes under its own weight, and the air pressure seals the third check valve 61. At this point, the airflow circulation path is: refrigeration chamber 101 → axial flow fan 3 → refrigeration duct 103 → storage chamber 102 → return air duct 104 → refrigeration chamber 101.

[0063] like Figure 2 As shown, when the air-cooled refrigeration equipment is running in the defrost mode, the axial flow fan 3 is reversed and drives the gas along Figure 2 Air flows in the direction indicated by the arrow. The first and second check valves 51 and 52 close under their own gravity and are then tightly closed by air pressure. The third check valve 61 opens under the influence of the airflow. At this point, the airflow circulation path is: refrigeration chamber 101 → defrost duct 105 → axial flow fan 3 → refrigeration chamber 101.

[0064] Optionally, in some embodiments of the present invention, the reverse rotation speed of the axial fan 3 is 1 / 4-3 / 4 of the forward rotation speed. The reason is that the heating device 4 needs a certain amount of time to heat the gas flowing through it so that the gas has enough heat to melt the frost on the evaporator 3.

[0065] Furthermore, in order to quickly separate the water or frost-water mixture attached to the evaporator 3 from the evaporator 3, after the evaporator 3 is defrosted, the reverse speed of the axial flow fan 3 can be increased to increase the flow rate of the airflow, so that the airflow can flush the water or frost-water mixture on the evaporator 3 away from the evaporator 3.

[0066] Based on the foregoing description, those skilled in the art will understand that the present invention enables the first and second one-way valves 51 and 52 to unidirectionally block the refrigeration circulation air path, and enables the third one-way valve 61 to unidirectionally block the defrost circulation air path, thereby ensuring the refrigeration function of the air-cooled refrigeration equipment. Furthermore, when the axial flow fan 3 rotates forward, the driving gas flows within the defrost circulation air path, thereby achieving the defrost function of the air-cooled refrigeration equipment. In short, the present invention can enable the air-cooled refrigeration equipment to perform refrigeration or defrost simply by controlling the forward and reverse rotation of the axial flow fan 3, and the control logic is simple.

[0067] Furthermore, when the air-cooled refrigeration device switches from cooling mode to defrosting mode, and immediately after the axial fan 3 stops rotating forward, the air pressure in the refrigeration chamber 101 is low. Furthermore, when the heating device 4 heats the evaporator 2, the air pressure in the refrigeration chamber 101 increases due to the expansion of the gas therein due to heat. In order to maintain the air pressure in the refrigeration chamber 101 at a relatively constant level, in other embodiments of the present invention, a pressure equalization channel (not shown) is provided on the device body 1. The pressure equalization channel communicates with the refrigeration chamber 101 at one end and leads to the exterior of the air-cooled refrigeration device at the other end.

[0068] Furthermore, although not shown in the figures, in other embodiments of the present invention, the device body 1 further includes a control valve for controlling the opening and closing of the pressure equalization channel. When the air-cooled refrigeration device is in cooling mode, the control valve closes the pressure equalization channel, blocking the connection between the refrigeration chamber 101 and the external environment; when the air-cooled refrigeration device is in defrost mode, the control valve opens the pressure equalization channel, allowing the refrigeration chamber 101 to connect with the external environment. The air pressure in the refrigeration chamber 101 is then balanced by the external environment, thereby preventing hot air from entering the storage chamber 102 when the gas in the refrigeration chamber 101 expands due to heat, causing the temperature of the storage chamber 102 to rise.

[0069] Furthermore, in order to prevent high-temperature gas in the refrigeration chamber 101 from entering the storage chamber 102, in yet other embodiments of the present invention, those skilled in the art may further, as needed, increase the speed of the axial flow fan 3 during reverse rotation as the temperature in the refrigeration chamber 101 increases. Those skilled in the art will appreciate that as the speed of the axial flow fan 3 increases, the flow rate of the gas in the defrost circulation air path also increases, thereby increasing the negative pressure upstream of the axial flow fan 3 and within the refrigeration air duct 103, thereby preventing high-temperature gas from entering the storage chamber 102 and causing a temperature rise in the storage chamber 102.

[0070] So far, the technical solutions of the present invention have been described in conjunction with the above multiple embodiments. However, it is easy for those skilled in the art to understand that the scope of protection 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 may split and combine the technical solutions in the above various embodiments, and may 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 scope of protection of the present invention.

Claims

1. An air-cooled refrigeration device comprising: The device body is defined as a refrigeration chamber, a storage chamber, a refrigeration air duct, a return air duct, and a defrost air duct, wherein the refrigeration chamber, the refrigeration air duct, the storage chamber, and the return air duct are sequentially connected end to end to form a refrigeration circulation air path; both ends of the defrost air duct are respectively connected to the refrigeration chamber to form a defrost circulation air path; an evaporator disposed in the refrigeration chamber and located between the two ends of the defrost air duct; an axial flow fan, wherein the forward-rotating axial flow fan drives the gas flowing through the refrigeration chamber to flow in the refrigeration circulation air path, and the reverse-rotating axial flow fan drives the gas flowing through the refrigeration chamber to flow in the defrost circulation air path; The refrigeration valve assembly includes a first one-way valve and a second one-way valve, wherein the first one-way valve does not allow the reversed axial flow fan to drive the gas to flow through the refrigeration air duct, and the second one-way valve does not allow the reversed axial flow fan to drive the gas to flow through the return air duct, so as to prevent the gas in the refrigeration chamber from entering the storage chamber when the axial flow fan is reversed, thereby affecting the temperature of the storage chamber; Among them, the speed of the axial flow fan during reverse rotation increases with the increase of the temperature in the refrigeration chamber, so as to increase the negative pressure between the first one-way valve and the axial flow fan, thereby closing the first one-way valve; and increase the positive pressure between the second one-way valve and the axial flow fan, thereby closing the second one-way valve, preventing high-temperature gas from entering the storage chamber.

2. The air-cooled refrigeration equipment according to claim 1, wherein: The axial flow fan is arranged obliquely above the evaporator.

3. The air-cooled refrigeration equipment according to claim 2, wherein: The angle between the axial flow fan and the horizontal plane is 0°-45°; and / or, The top surface of the evaporator is tilted so that the gas blown out from the reverse-rotating axial flow fan is blown vertically toward the top surface.

4. The air-cooled refrigeration equipment according to claim 1, wherein: Each air outlet of the cooling air duct is respectively provided with a first one-way valve; The air inlet or the air outlet of the return air channel is provided with the second one-way valve.

5. The air-cooled refrigeration equipment according to claim 1, wherein: The air-cooled refrigeration equipment further includes a defrost valve assembly, The defrost valve assembly is used to block the defrost circulation air path.

6. The air-cooled refrigeration equipment according to claim 5, wherein: The defrost valve assembly includes a third one-way valve, The third one-way valve is used to block the defrost air duct in one direction. The third one-way valve only allows the reverse-rotating axial flow fan to drive the gas to flow through the defrost air duct, but does not allow the forward-rotating axial flow fan to drive the gas to flow through the defrost air duct.

7. The air-cooled refrigeration equipment according to claim 6, wherein: The first one-way valve, the second one-way valve and the third one-way valve are all thin plates pivotally connected to the device body. The pivot axis of each of the thin plates is located at the top of the corresponding thin plate, so that the first one-way valve, the second one-way valve and the third one-way valve can be closed under the action of their own weight.

8. The air-cooled refrigeration equipment according to any one of claims 1 to 7, wherein: The device body is defined as having two refrigeration air ducts and one defrost air duct, and the defrost air duct is located between the two refrigeration air ducts; and / or, The reverse rotation speed of the axial flow fan is 1 / 4-3 / 4 of the forward rotation speed; and / or, The device body is provided with a pressure equalizing channel, the pressure equalizing channel is communicated with the refrigeration chamber through one end thereof, and the pressure equalizing channel leads to the outside of the air-cooled refrigeration device through the other end thereof.

9. The air-cooled refrigeration equipment according to any one of claims 1 to 7, wherein: The device body includes an air duct cover plate, and the cooling air duct and the defrosting air duct are both formed on the air duct cover plate.

10. The air-cooled refrigeration equipment according to any one of claims 1 to 7, wherein: The air-cooled refrigeration equipment further includes a heating device, which is arranged on the top of the evaporator.

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