Radiator, radiator defrost water collecting assembly, refrigerator

Abstract

The utility model provides a radiator, radiator defrosting water collection subassembly, refrigerator, wherein the radiator, including radiating base plate and multiple radiating fins on radiating base plate, the outer surface of radiating fin forms with multiple first micro -groove, is equipped with along its extension direction setting electric wetting component in each first micro -groove to utilize the electric wetting effect drive adsorption in first micro -groove droplet flows along the preset direction. The utility model under the action of capillary effect makes droplet be adsorbed in each first micro -groove, prevent droplet from separating from radiator and suspending in air, utilize the electric wetting effect of electric wetting component in first micro -groove and form collection to the directional transfer of droplet to the preset position, overcome the technical insufficiency that the mode of directional conveying collection of radiator defrosting water in related art needs to configure pumping and airflow driving part under the weightlessness environment.

Description

Technical Field

[0001] This utility model belongs to the field of radiator design technology, specifically relating to a radiator, a radiator defrost water collection component, and a refrigerator. Background Technology

[0002] If a refrigerator is in a weightless environment, such as during the operation of a spacecraft, the conventional method of relying on gravity to drain the defrost water cannot be used in such an environment. The defrost water cannot be drained and collected, which seriously affects the stability of the internal environment of the spacecraft and the long-term reliability of the equipment. In order to drain the defrost water from the radiator in a timely manner in a weightless environment, related technologies use pump suction devices and corresponding airflow drive devices. This method uses more components and has a more complex structure, which will lead to an increase in mass, especially for spacecraft. Utility Model Content

[0003] Therefore, this utility model provides a radiator, a radiator defrost water collection component, and a refrigerator, which can overcome the shortcomings of related technologies in terms of the large number of components, complex structure, and large mass of radiator defrost water discharge structure in weightless environments.

[0004] To address the aforementioned problems, this utility model provides a heat sink, comprising a heat sink substrate and a plurality of heat sink fins on the heat sink substrate. The outer surface of the heat sink fins is formed with a plurality of first microgrooves, and an electrowetting component is provided in each of the first microgrooves along its extension direction, so as to drive the droplets adsorbed in the first microgrooves to flow along a preset direction by means of electrowetting.

[0005] In some embodiments, the electrowetting assembly includes a plurality of electrodes spaced apart along the preset direction and an insulating layer surrounding each of the electrodes, and / or the electrowetting assembly further includes a hydrophobic layer disposed outside the electrodes, wherein the hydrophobic layer is located on the side of each electrode near the opening of the first microgroove.

[0006] In some embodiments, the distance between the electrowetting component and the opening of the first microgroove is the depth h of the first microgroove, 80μm≤h≤150μm, and / or the width of the first microgroove is w, 50μm≤w≤120μm.

[0007] In some embodiments, the heat dissipation fins have a hydrophilic layer on their outer surface, except for the area occupied by the slot opening of the first microgroove.

[0008] In some embodiments, multiple first microgrooves are formed on both opposite sides of each heat dissipation fin; and / or, one end of each of the first microgrooves on the same side of each heat dissipation fin converges in a first region of the heat dissipation fin along the preset direction.

[0009] This utility model also provides a radiator defrost water collection component, including the radiator, defrost water storage tank and a water collection tray between the radiator and the defrost water storage tank, wherein the droplets transferred by the radiator along the preset direction can be collected by the water collection tray by the capillary effect generated by the hydrophilic gradient material and guided and stored in the defrost water storage tank.

[0010] In some embodiments, the heat dissipation fins of the heat sink are arranged parallel to each other along a first direction, and the direction in which each heat dissipation fin protrudes from the heat dissipation substrate is a second direction. When one end of each of the first microgrooves converges in the first area of ​​the heat dissipation fin, the water collection tray has its length in the first direction and its width in the second direction. The length of the water collection tray is not less than the maximum length occupied by each heat dissipation fin in the first direction. The width of the water collection tray is d, and the width of each heat dissipation fin in the second direction is s, where s / 5≤d≤s / 2.

[0011] In some embodiments, the water collection tray has a drain outlet, and multiple second microgrooves are formed on the top surface of the water collection tray. One end of each second microgroove converges at the drain outlet, and multiple electrowetting components are also provided in the second microgrooves along their extension direction to transfer droplets collected in the first region to the drain outlet; and / or, multiple hydrophilic layers are provided on the top surface of the water collection tray, the multiple hydrophilic layers are arranged sequentially along the direction close to the drain outlet, and the hydrophilicity increases in the direction close to the drain outlet.

[0012] In some embodiments, a first drain pipe is connected to the drain outlet, and the first drain pipe has a flow guide core made of a hydrophilic porous material. The hydrophilicity of the hydrophilic porous material increases along the direction from the drain outlet to the defrost water storage tank.

[0013] In some embodiments, a vent is formed on the outer wall of the defrost water storage tank, and the vent is provided with a hydrophobic microporous membrane.

[0014] This utility model also provides a refrigerator, including a refrigerator body, a semiconductor refrigeration component for cooling the compartments inside the refrigerator body, and the above-mentioned radiator defrost water collection component, wherein the radiator is the cold end radiator of the semiconductor refrigeration component.

[0015] In some embodiments, the semiconductor refrigeration assembly further includes a hot-end radiator located on the outside of the refrigerator body, the hot-end radiator being equipped with a cooling fan, and the defrost water storage tank being located in the path of the airflow driven by the cooling fan.

[0016] The radiator, radiator defrost water collection component, and refrigerator provided by this utility model have the following beneficial effects:

[0017] On the one hand, forming the first microgroove on the outer surface of the heat sink fins can create a capillary effect on the droplets formed during defrosting of the heat sink. Under the action of the capillary effect, the droplets are adsorbed into each of the first microgrooves, preventing the droplets from detaching from the heat sink and suspending in the air (such as in the air duct of a refrigerator) and causing adverse effects on the electrical components in the corresponding area. On the other hand, the electrowetting effect of the electrowetting component located in the first microgroove can be used to directionally transfer the aforementioned droplets to a preset position and form a collection, ensuring the normal heat dissipation operation of the heat sink and ensuring the heat dissipation effect of the heat sink. Since the electrowetting component is used to achieve directional delivery of droplets, it overcomes the technical shortcomings of related technologies that require the configuration of pumps and airflow drive components to achieve directional delivery and collection of defrosting water in a weightless environment, which have many components, complex structure and large mass. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the radiator in an embodiment of this utility model;

[0020] Figure 2 yes Figure 1 A schematic diagram of the structure of the first microgroove formed on the side of a heat dissipation fin. The dimensions in the diagram have been exaggerated for clarity.

[0021] Figure 3 yes Figure 2 A magnified view of the first microgroove (the cross-section of the first microgroove is rectangular);

[0022] Figure 4 yes Figure 2 A magnified view of the first microgroove (the cross-section of the first microgroove is circular);

[0023] Figure 5 yes Figure 2 A partial schematic diagram of the electrowetting assembly in the image;

[0024] Figure 6 yes Figure 2 A partial schematic diagram of the cross-section of the first microgroove in the figure; the dimensions in the figure have been exaggerated for clarity.

[0025] Figure 7 This is a schematic diagram of a partial structure of the radiator defrost water collection component in another embodiment of the present invention;

[0026] Figure 8 yes Figure 7 A top view of the water collection tray (arrows in the figure indicate the direction of droplet flow);

[0027] Figure 9 This is a schematic diagram of the internal structure of a refrigerator according to another embodiment of the present invention;

[0028] Figure 10 yes Figure 9 A schematic diagram of the semiconductor cooling component in the diagram;

[0029] Figure 11 yes Figure 9 The diagram shows a three-dimensional structure of a refrigerator, with arrows indicating the airflow direction of the radiator at the hot end.

[0030] The attached figures are labeled as follows:

[0031] 11. Heat dissipation substrate; 12. Heat dissipation fins; 121. First microgroove; 122. Hydrophilic layer; 2. Electrowetting component; 21. Electrode; 22. Hydrophobic layer; 23. Insulating layer; 3. Defrost water storage tank; 31. Hydrophobic microporous membrane; 4. Water collection tray; 41. Drain outlet; 42. First drain pipe; 421. Guide core; 43. Second microgroove; 5. Water storage container; 51. Second drain pipe; 100. Refrigerator body; 101. Air supply fan; 102. Air supply duct; 200. Semiconductor refrigeration component; 201. Cold end heat sink; 202. Hot end heat sink; 2021. Cooling fan; 203. Semiconductor refrigeration chip; 204. Cooling block. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0033] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0034] 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° or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0035] 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 cannot be construed as limiting the scope of protection of this utility model.

[0036] See also Figures 1 to 11 As shown, according to an embodiment of the present invention, a heat sink is provided, including a heat sink substrate 11 and a plurality of heat sink fins 12 on the heat sink substrate 11. In a specific embodiment, each heat sink fin 12 is arranged parallel to each other along a first direction, that is, the width direction of the heat sink substrate 11. A cooling airflow channel is formed between two adjacent heat sink fins 12. A plurality of first microgrooves 121 are formed on the outer surface of the heat sink fins 12. An electrowetting component 2 is provided in each first microgroove 121 along its extension direction, so as to drive the droplets adsorbed in the first microgroove 121 to flow along a preset direction by means of electrowetting effect. It is understood that the arrangement density of the aforementioned first microgrooves 121 on the outer surface of the heat sink fins 12 should theoretically be selected as a higher value within a reasonable range. The aforementioned preset direction is specifically from the low voltage side to the high voltage side of the electrowetting component 2 when the electrowetting component 2 is running.

[0037] In this technical solution, on the one hand, the first microgrooves 121 formed on the outer surface of the heat dissipation fins 12 can create a capillary effect on the droplets formed by defrosting of the heat dissipation fins. Under the action of the capillary effect, the droplets are adsorbed into each of the first microgrooves 121, preventing the droplets from detaching from the heat dissipation fins and suspending in the air (such as in the air duct 102 of a refrigerator) and causing adverse effects on the electrical components in the corresponding area. On the other hand, the electrowetting effect of the electrowetting component located in the first microgrooves 121 can be used to directionally transfer the aforementioned droplets to a preset position and form a collection, ensuring the normal heat dissipation operation of the heat dissipation fins and ensuring the heat dissipation effect of the heat dissipation fins. Since the electrowetting component 2 is used to achieve directional delivery of droplets, it overcomes the technical shortcomings of related technologies that require the configuration of pumps and airflow drive components to achieve directional delivery and collection of defrosting water in a weightless environment, which have many components, complex structure and large mass.

[0038] In some embodiments, the electrowetting assembly 2 includes a plurality of electrodes 21 spaced apart along the preset direction and an insulating layer 23 covering each of the electrodes 21. This ensures the safety of the heat sink during use, and the insulating layer 23 also improves the waterproof performance of each electrode 21.

[0039] The electrowetting component 2 further includes a hydrophobic layer 22 disposed outside the electrode 21, and the hydrophobic layer 22 is located on the side of each electrode 21 near the opening of the first microgroove 121, which can improve the efficiency of electrowetting. In a preferred embodiment, the hydrophobic layer 22 is disposed outside the aforementioned insulating layer 23.

[0040] The following combination Figure 5 The electrowetting effect of electrowetting component 2 is explained as follows:

[0041] by Figure 5 The orientation shown is for reference only. From left to right, the voltage of each electrode 21 increases, meaning the left side of the diagram represents the low-voltage side and the right side represents the high-voltage side. This means that each electrode 21 within the electrowetting assembly 2 forms a voltage gradient in the predetermined direction. Figure 2 The voltage of the heat sink in the indicated orientation gradually increases from top to bottom, forming a voltage gradient and applying voltage to the electrode array. The voltage changes the wettability of the droplets on the solid wall and creates a difference. The contact angle B0 of the droplets on the low voltage side is greater than the contact angle B1 of the droplets on the high voltage side. The difference in contact angle and wettability on both sides of the droplet leads to a pressure difference inside the droplet, forcing the droplet to flow in the direction of increasing voltage. This enables the droplet to flow directionally along the microgrooves in a weightless environment.

[0042] In some embodiments, the distance between the electrowetting component 2 and the opening of the first microgroove 121 is the depth h of the first microgroove 121, 80μm≤h≤150μm, and / or the width of the first microgroove 121 is w, 50μm≤w≤120μm.

[0043] In this technical solution, the size of the first microgroove 121 is limited, which can ensure that the capillary effect of the first microgroove 121 is at an optimal level, and ensure reliable adsorption of the formed defrosting water.

[0044] In some embodiments, the heat dissipation fins 12 have a hydrophilic layer 122 on their outer surface except for the area occupied by the slot of the first microgroove 121. That is, a hydrophilic layer 122 is formed on the outer surface of the heat dissipation fins 12 except for the area where the first microgroove 121 is formed.

[0045] In this technical solution, a hydrophilic layer 122 is provided on the area between the two first microgrooves 121 where no microgrooves are constructed. The hydrophilic layer 122 has a hydrophilic effect, and the droplets formed after defrosting will be adsorbed onto the outer surface of the heat dissipation fins 12 by their own surface tension, and further enter each of the first microgrooves 121 under the capillary effect of the aforementioned first microgrooves 121, preventing the droplets from being suspended in the air. In this way, the distance between two adjacent first microgrooves 121 can be appropriately increased, that is, the density of the first microgrooves 121 is reduced, and the processing difficulty and processing cost are reduced.

[0046] In some embodiments, multiple first microgrooves 121 are formed on the two opposite sides of each heat dissipation fin 12 to ensure reliable adsorption and transfer collection of defrosting droplets (i.e. defrosting water).

[0047] See details Figure 2 As shown, in some embodiments, one end of each of the first microgrooves 121 located on the same side of each of the heat dissipation fins 12 converges along the preset direction at a first region of the heat dissipation fin 12, so as to Figure 2 Taking the orientation shown as an example, the heat dissipation fins 12 in the figure are placed vertically during actual use. At this time, the aforementioned first area is the center position of the bottom edge of the heat dissipation fins 12. Specifically, each of the first micro-grooves 121 forms a converging ray layout with the aforementioned first area as the convergence point.

[0048] In this technical solution, by converging the droplet delivery ends of each of the first microgrooves 121 into the first region, the design of subsequent droplet collection-related structures can be simplified, and the size of the related structures can be reduced.

[0049] According to an embodiment of the present invention, a defrost water collection component for a radiator is also provided, including the radiator described above, a defrost water storage tank 3, and a water collection tray 4 located between the radiator and the defrost water storage tank 3. The droplets transferred by the radiator along the preset direction can be collected by the water collection tray 4 by the capillary effect generated by the hydrophilic gradient material (such as common porous materials such as sponges) and guided and stored in the defrost water storage tank 3.

[0050] In this technical solution, the defrost water droplets transferred to the first region by the first micro-grooves 121 through the capillary effect of the water collection tray 4 are further transferred to the defrost water storage tank 3, which effectively prevents the accumulation of droplets in the first region of the radiator and further prevents the phenomenon of droplets detaching from the radiator and suspending in the air due to droplet accumulation.

[0051] In some embodiments, the heat dissipation fins 12 of the heat sink are arranged parallel to each other along a first direction, and the direction in which each heat dissipation fin 12 protrudes from the heat dissipation substrate 11 is a second direction. When one end of each of the first microgrooves 121 converges in the first region of the heat dissipation fin 12, the water collection plate 4 has its length in the first direction and its width in the second direction. The length of the water collection plate 4 is not less than the maximum length occupied by each heat dissipation fin 12 in the first direction. The width of the water collection plate 4 is d, and the width of each heat dissipation fin 12 in the second direction is s, where s / 5≤d≤s / 2.

[0052] In this technical solution, the length of the aforementioned water collection tray 4 covers the first region of each heat dissipation fin 12 while its width is smaller than the width of each heat dissipation fin 12. This ensures the comprehensive and efficient transfer of droplets transferred from each heat dissipation fin 12 to the first region while minimizing the obstruction of the cooling flow channels of each heat dissipation fin 12, thereby ensuring the heat dissipation effect of the heat dissipation fin 12.

[0053] In some embodiments, the water collection tray 4 has a drain outlet 41, and multiple second microgrooves 43 are formed on the top surface of the water collection tray 4. One end of each second microgroove 43 converges at the drain outlet 41, and multiple electrowetting components 2 are also provided in the second microgrooves 43 along their extension direction to transfer droplets collected in the first region to the drain outlet 41, so as to further improve the transfer efficiency of droplets from the water collection tray 4 to the drain outlet 41; and / or, the top surface of the water collection tray 4 is provided with multiple hydrophilic layers (not indicated in the figure), the multiple hydrophilic layers are arranged sequentially along the direction close to the drain outlet 41 and the hydrophilicity increases in the direction close to the drain outlet 41. The aforementioned hydrophilic layers are specifically made of hydrophilic materials so as to achieve efficient transfer of droplets from the water collection tray 4 to the drain outlet 41 by utilizing capillary effect.

[0054] In some embodiments, a first drain pipe 42 is connected to the drain outlet 41. The first drain pipe 42 has a guide core 421 inside. The guide core 421 is made of a hydrophilic porous material, and the hydrophilicity of the hydrophilic porous material increases along the direction from the drain outlet 41 to the defrost water storage tank 3. This ensures the efficient transfer of droplets in the water collection tray 4 to the defrost water storage tank 3. It is understood that the defrost water storage tank 3 is also filled with a hydrophilic porous material, and the hydrophilicity of the hydrophilic porous material also forms a gradient in the direction of droplet transport to ensure the efficient transfer of droplets by capillary effect.

[0055] In some embodiments, a vent is formed on the outer wall of the defrost water storage tank 3, and a hydrophobic microporous membrane 31 is provided on the vent. Specifically, the aforementioned hydrophobic microporous membrane 31 is a breathable but water-impermeable membrane such as a polytetrafluoroethylene (PTFE) membrane. This membrane can balance the pressure inside and outside the defrost water storage tank 3, ensuring the smooth migration of defrost water to the defrost water storage tank 3. Moreover, over time, the droplets transferred into the defrost water storage tank 3 can evaporate in their designated space area and escape from the defrost water storage tank 3 as water vapor (gas), ensuring the long-lasting capillary effect of the corresponding hydrophilic material.

[0056] In some embodiments, the radiator defrost water collection assembly includes a water storage container 5, which is connected to the defrost water storage tank 3 via a second drain pipe 51 with a guide core, so that the water in the defrost water storage tank 3 can be further transferred and stored in the water storage container 5. It is understood that the volume of the aforementioned water storage container 5 is larger than the volume of the defrost water storage tank 3. In addition to storing the aforementioned defrost water, the water storage container 5 is also used to store other types of water (such as domestic water in spacecraft).

[0057] The aforementioned hydrophilic layer 122 can be formed using PU, PVP, PVA, or polyacrylic acid materials; the aforementioned hydrophobic layer 22 can be formed using fluorocarbon compounds, silanes, organosilicon, or graphene materials.

[0058] According to embodiments of this utility model, in conjunction with reference to... Figures 9 to 11 As shown, a refrigerator is also provided, including a refrigerator body 100, a semiconductor cooling component 200 for cooling the compartments inside the refrigerator body 100, and the aforementioned radiator defrost water collection component. The radiator is the cold end radiator 201 of the semiconductor cooling component 200. The semiconductor cooling component 200 is used to cool each compartment inside the refrigerator body 100. The structure is compact and can further reduce the weight of the refrigerator, which is especially suitable for working conditions such as aerospace vehicles.

[0059] See details Figure 10As shown, in some embodiments, the semiconductor refrigeration component 200 further includes a hot-end radiator 202 located on the outside of the refrigerator body 100. The hot-end radiator 202 is equipped with a cooling fan 2021 for efficient cooling. The defrost water storage tank 3 is located in the path of the airflow driven by the cooling fan 2021. Ideally, the position of the droplet removal end (i.e., the highly hydrophilic end) of the guide core 421 of the aforementioned first drain pipe 42 corresponds to the position of the aforementioned vent, and the position of the vent is also located in the path of the airflow driven by the aforementioned cooling fan 2021. In this way, the heat of the hot-end radiator 202 can be used to dry and evaporate the porous hydrophilic material (including the droplet removal end of the aforementioned guide core 421) in the defrost water storage tank 3. This ensures that the capillary effect of the porous hydrophilic material is fully and persistently utilized, while efficiently utilizing the waste heat of the hot-end radiator 202 and preventing the temperature rise of the space where the refrigerator is located.

[0060] See details Figure 10 As shown, in the aforementioned semiconductor refrigeration assembly, the cold end heat sink 201 and the hot end heat sink 202 are thermally coupled to the cold end and hot end of the semiconductor refrigeration chip 203, respectively. In order to ensure the cooling capacity of the cold end and the heat transfer efficiency of the cold end heat sink 201, a cooling block 204 is also provided between them. The cooling block 204 and the cold end heat sink 201 are both located in the air supply duct 102 inside the refrigerator body 100. The air supply fan 101 (in a specific embodiment, a centrifugal fan) is also located in the air supply duct 102. When the air supply fan 101 is running, it drives the air inside the refrigerator body 100 to circulate so as to transfer the cooling capacity at the cold end heat sink 201 to each compartment to achieve the purpose of refrigeration.

[0061] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0062] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A radiator, characterized in that, It includes a heat dissipation substrate (11) and a plurality of heat dissipation fins (12) on the heat dissipation substrate (11). A plurality of first micro-grooves (121) are formed on the outer surface of the heat dissipation fins (12). An electrowetting component (2) is provided in each of the first micro-grooves (121) along its extension direction, so as to drive the droplets adsorbed in the first micro-grooves (121) to flow along a preset direction by means of electrowetting.

2. The radiator according to claim 1, characterized in that, The electrowetting assembly (2) includes a plurality of electrodes (21) spaced apart along the preset direction and an insulating layer (23) wrapped around each of the electrodes (21), and / or, the electrowetting assembly (2) further includes a hydrophobic layer (22) disposed outside the electrodes (21), and the hydrophobic layer (22) is located on the side of each of the electrodes (21) near the opening of the first microgroove (121).

3. The radiator according to claim 1, characterized in that, The distance between the electrowetting component (2) and the opening of the first microgroove (121) is the depth h of the first microgroove (121), 80μm≤h≤150μm, and / or the width of the first microgroove (121) is w, 50μm≤w≤120μm.

4. The radiator according to claim 1, characterized in that, The heat dissipation fins (12) have a hydrophilic layer (122) on their outer surface, except for the area occupied by the slot opening of the first micro-groove (121).

5. The radiator according to claim 1, characterized in that, Multiple first microgrooves (121) are formed on two opposite sides of each heat dissipation fin (12); and / or, one end of each of the first microgrooves (121) on the same side of each heat dissipation fin (12) converges in the first region of the heat dissipation fin (12) along the preset direction.

6. A defrosting water collection assembly for a radiator, characterized in that, The device includes a radiator as described in any one of claims 1 to 5, a defrost water storage tank (3), and a water collection tray (4) located between the radiator and the defrost water storage tank (3). The droplets transferred by the radiator along the preset direction can be collected by the water collection tray (4) by the capillary effect generated by the hydrophilic gradient material and guided into the defrost water storage tank (3).

7. The radiator defrost water collection assembly according to claim 6, characterized in that, The heat dissipation fins (12) of the heat sink are arranged parallel to each other along the first direction. The direction in which each heat dissipation fin (12) protrudes from the heat dissipation substrate (11) is the second direction. When one end of each of the first micro-grooves (121) converges in the first area of ​​the heat dissipation fin (12), the water collection plate (4) has its length in the first direction and its width in the second direction. The length of the water collection plate (4) is not less than the maximum length occupied by each heat dissipation fin (12) in the first direction. The width of the water collection plate (4) is d, and the width of each heat dissipation fin (12) in the second direction is s, where s / 5≤d≤s / 2.

8. The radiator defrost water collection assembly according to claim 6, characterized in that, The water collection tray (4) has a drain outlet (41). Multiple second microgrooves (43) are formed on the top surface of the water collection tray (4). One end of each second microgroove (43) converges at the drain outlet (41). Multiple electrowetting components (2) are also provided in the second microgrooves (43) along their extension direction so that the droplets collected in the first area are transferred to the drain outlet (41). And / or, the top surface of the water collection tray (4) is provided with multiple hydrophilic layers. The multiple hydrophilic layers are arranged sequentially along the direction close to the drain outlet (41) and the hydrophilicity increases in the direction close to the drain outlet (41).

9. The radiator defrost water collection assembly according to claim 8, characterized in that, A first drain pipe (42) is connected to the drain outlet (41). The first drain pipe (42) has a flow guide core (421) inside. The flow guide core (421) is made of a hydrophilic porous material. The hydrophilicity of the hydrophilic porous material increases along the direction from the drain outlet (41) to the defrost water storage tank (3).

10. The radiator defrost water collection assembly according to claim 6, characterized in that, A vent is formed on the outer wall of the defrost water storage tank (3), and a hydrophobic microporous membrane (31) is provided on the vent.

11. A refrigerator, characterized in that, The refrigerator includes a refrigerator body (100), a semiconductor cooling assembly (200) for cooling the compartments within the refrigerator body (100), and a radiator defrost water collection assembly according to any one of claims 6 to 10, wherein the radiator is the cold end radiator (201) of the semiconductor cooling assembly (200).

12. The refrigerator according to claim 11, characterized in that, The semiconductor refrigeration component (200) also has a hot end radiator (202) located on the outside of the refrigerator body (100), the hot end radiator (202) is equipped with a cooling fan (2021), and the defrost water storage tank (3) is located in the path of the airflow driven by the cooling fan (2021).

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