Device for transferring heat from heat source to fluid

Abstract

The invention discloses a device (102; 202), when the device (102; 202) is connected to a heat source (104), the device (102; 202) for transferring heat from the heat source (104) to the fluid. The device (102; 202) includes a heat sink (106; 106 ') having a heat sink substrate (108); 206) and a fin (110) extending in a longitudinal direction (112). The heat sink substrate (108) and the fins (110) form longitudinal channels (114) for the flow of the fluid. The device (102) also includes one or more flaps (118) having a longitudinal extension (119) and located in the longitudinal channel (114). Introducing turbulent flow through the flap (118) enhances the mixing of a heating fluid (heated by the fins) through the longitudinal channel (114) with a main stream of an initial cold fluid, thereby improving the heat transfer efficiency of the heat sink. The invention also provides a network access node for a wireless communication system wherein the network access node comprises a device (102; 202) for a vehicle.

Description

Technical Field

[0001] The invention relates to a device for transferring heat from a heat source to a fluid, wherein the device comprises a heat sink. Furthermore, the invention relates to a method for producing a device of the above type. The invention also relates to a network access node for a wireless communication system, wherein the network access node comprises a device of the above type. The network access node may comprise a base station. Background Art

[0002] Heat sinks are used in various technical fields, such as the telecommunication field, where they can be installed in network access nodes, such as base station units or radio units, to provide cooling. Network access nodes often require cooling due to the presence of heat sources or heat generators in them, such as transmitters, printed circuit boards, optical transducers, power amplifiers, etc. Typically, heat sinks have a plurality of fins. Summary of the invention

[0003] The inventors of the present invention have discovered disadvantages of conventional cooling schemes (e.g., in the telecommunications field). Increasing the airflow through the heat sink or enlarging the cooling area of ​​the heat sink (e.g., increasing the number of fins) can increase the cooling capacity of conventional heat sinks. However, the inventors of the present invention have discovered that in some conventional applications, increasing the airflow is not desirable due to limitations on the noise generated by the fan used to generate the airflow through the heat sink. The inventors of the present invention have discovered that increasing the number of fins in a conventional heat sink may result in disadvantages such as higher flow resistance, thereby reducing the flow rate for a given fan power. Some conventional cooling schemes are not efficient enough at acceptable sound or noise levels.

[0004] An object of embodiments of the present invention is to provide a solution to reduce or solve the disadvantages and problems of conventional solutions.

[0005] The above and other objects are achieved by the subject matter claimed in the independent claims. Further advantageous embodiments of the invention can be found in the dependent claims.

[0006] According to a first aspect of the present invention, the above and other objects are achieved by a device, wherein when the device is connected to a heat source, the device is used to transfer heat from the heat source to a fluid; the device comprises a heat sink, and the heat sink comprises:

[0007] Radiator base plate;

[0008] Two or more fins, wherein

[0009] The fin has a longitudinal extension extending in the longitudinal direction;

[0010] The heat sink substrate and the fins form a longitudinal channel for flowing the fluid;

[0011] The device comprises one or more flaps having a longitudinal extension, wherein

[0012] The flap is located in one of the longitudinal channels.

[0013] The device according to the first aspect has the advantage of improving the cooling effect, for example, improving the cooling effect of the heat source. The device according to the first aspect has the advantage of improving the cooling performance and / or cooling efficiency. The device according to the first aspect has the advantage of improving the cooling capacity of the radiator without increasing the flow resistance of the radiator. The device according to the first aspect has the advantage of improving the cooling capacity of the radiator without increasing the fan power and thus the noise generated by the fan or the flow when the fluid passes through the radiator.

[0014] The advantage of the device according to the first aspect is that the flap introduces turbulence, for example, small-scale eddy motion in the longitudinal channel. Turbulence destroys the boundary layer and enhances the mixing of the heated fluid (heated by the fins) with the mainstream of the initial cold fluid through the longitudinal channel. Therefore, the flow condition is improved, the fluid can efficiently pass through the radiator, and transfer or take away more heat from the heat source and the fins, thereby improving the heat transfer efficiency or thermal conductivity of the radiator, so that the heat source (for example, electrical or electronic components) and / or the area around the heat source is efficiently cooled. Improving the heat transfer efficiency or thermal conductivity of the radiator can reduce the volume and weight of the device, which is an advantage for network access nodes (for example, base stations) used in wireless communication systems. For example, smaller, lighter or less efficient fans can be used. Therefore, the production efficiency of the network access node is higher and the space occupied during installation is smaller. This can significantly reduce the temperature of typical electrical or electronic components of typical base stations.

[0015] It should be understood that the fluid may include a gas, a gas mixture (e.g., air), a liquid, or a mixture thereof. For some embodiments, the flap may be referred to as a reed, or a flutter reed. It should be understood that the flap is flexible or bendable. For some embodiments, the flap is configured to flip or flutter when exposed to the fluid.

[0016] In one implementation of the device according to the first aspect, the radiator includes a radiator top, wherein the two or more fins are located between the radiator substrate and the radiator top, and the radiator substrate, the radiator top and the fins together form the longitudinal channel. The advantage of this implementation is that a circumferentially closed longitudinal channel is formed, thereby more efficiently ensuring that the fluid is in contact with the fins over the entire length of the radiator. Therefore, the control of the flow through the radiator is strengthened, and the heat of the radiator can be transferred more efficiently, thereby improving the heat transfer efficiency or thermal conductivity of the radiator. The advantage of this implementation is that the cooling effect is further improved.

[0017] In an implementation of the device according to the first aspect, the longitudinal extension of the flap extends along the longitudinal direction. The advantage of this implementation is that there is an efficient interaction between the flap and the fluid, thereby enhancing the mixing of the heated fluid (heated by the fins) with the main flow of the initial cold fluid through the longitudinal channel without increasing the flow resistance. The heat of the fins can be efficiently transferred to the fluid, thereby further improving the heat transfer efficiency and cooling efficiency of the radiator. The advantage of this implementation is that the cooling effect is further improved.

[0018] In an implementation of the device according to the first aspect, the flap is configured to vibrate when the fluid flows through the longitudinal channel. This implementation has the advantage of further improving the cooling effect.

[0019] In an implementation of the device according to the first aspect, the flap is used to vibrate in the longitudinal channel. This implementation has the advantage of further improving the cooling effect.

[0020] In one implementation of the device according to the first aspect, the flap is used to provide turbulence in the fluid. The advantage of this implementation is that it enhances the mixing of the heated fluid (heated by the fins) with the mainstream of the initial cold fluid, so that heat can be efficiently transferred to the fluid, thereby further improving the heat transfer efficiency and cooling efficiency of the radiator. The advantage of this implementation is that the cooling effect is further improved.

[0021] In an implementation of the device according to the first aspect, the longitudinal channel has an inlet and an outlet for the fluid, wherein the flap is connected at a position close to the inlet of the longitudinal channel. The advantage of this implementation is that turbulence is enhanced at the beginning of the longitudinal channel or close to the inlet, so that the fluid passing through the longitudinal channel can efficiently transfer heat, thereby further improving the heat transfer efficiency and cooling efficiency of the radiator. The advantage of this implementation is that the cooling effect is further improved.

[0022] In an implementation of the device according to the first aspect, the flap is connected in the longitudinal channel. The advantage of this implementation is that it provides a simple and efficient way to implement the flap. The advantage of this implementation is that the cooling effect is further improved.

[0023] In one implementation of the device according to the first aspect, the flap is connected to one or more components of the group consisting of:

[0024] The radiator substrate;

[0025] The top of the radiator;

[0026] · The fins.

[0027] The advantage of this implementation is that the flap can be connected to one or more existing components of the heat sink, thereby providing a simple and flexible configuration. The advantage of this implementation is that the cooling effect is further improved.

[0028] In one implementation of the device according to the first aspect, the device comprises one or more rigid members, wherein:

[0029] The flap is connected to the rigid member;

[0030] The rigid member is connected to one or more components selected from the group consisting of:

[0031] The radiator substrate;

[0032] The top of the radiator;

[0033] · The fins.

[0034] The advantage of this implementation is that the rigid component provides stability, making the flap implementation robust. In addition, a flexible implementation of the flap is provided. The advantage of this implementation is that the cooling effect is further improved. For some embodiments, the rigid component may include a pin.

[0035] In one implementation of the apparatus according to the first aspect, the rigid member is immovable relative to one or more of the following components: the heat sink base, the heat sink top, and the fins, wherein

[0036] The flap includes a first end and a second end;

[0037] The longitudinal extension of the flap extends from the first end to the second end;

[0038] The first end of the flap is connected to the rigid member;

[0039] The first end of the flap is immovable relative to the rigid member.

[0040] The advantage of this implementation is that it provides a simple and robust way to implement the flap. The advantage of this implementation is that it further improves the cooling effect.

[0041] In an implementation of the device according to the first aspect, the flap is spaced apart from the fin. When the flap includes a first end, the first end of the flap can be spaced apart from the fin. The advantage of this implementation is that the fluid can flow on both sides of the flap, thereby significantly enhancing turbulence, and heat can be efficiently transferred, thereby improving the heat transfer efficiency and cooling efficiency of the radiator. The advantage of this implementation is that the cooling effect is further improved.

[0042] In one implementation of the device according to the first aspect, the radiator is used for a fluid in gas form or in the form of a gas mixture. The advantage of this implementation is that heat can be efficiently transferred, thereby further improving the heat transfer efficiency or thermal conductivity of the radiator and the cooling efficiency. The advantage of this implementation is that the cooling effect is further improved. For alternative embodiments, the radiator can be used for a fluid in liquid form or in the form of a gas and liquid mixture, such as water vapor or steam.

[0043] In an implementation of the device according to the first aspect, one or more of the longitudinal channels accommodate one of the flaps. This implementation has the advantage of further improving the cooling effect.

[0044] According to a second aspect of the present invention, the above and other objects are achieved by a method for producing or manufacturing a device, wherein when the device is connected to a heat source, the device is used to transfer heat from the heat source to a fluid; the device comprises a heat sink, the heat sink comprising:

[0045] Radiator base plate;

[0046] Two or more fins, wherein

[0047] The fin has a longitudinal extension extending in the longitudinal direction;

[0048] The heat sink substrate and the fins form a longitudinal channel for flowing the fluid;

[0049] The method comprises:

[0050] One or more flaps having a longitudinal extension are connected in one or more of the longitudinal channels.

[0051] The advantages of the method according to the second aspect correspond to the advantages of the apparatus according to the first aspect and its implementations or embodiments mentioned above or below.

[0052] According to a third aspect of the present invention, the above and other purposes are achieved by a network access node for a wireless communication system, wherein the network access node includes a device according to any one of the embodiments or implementations mentioned above or below. The inventors of the present invention have found that some cooling schemes of network access nodes are not efficient enough. The advantage of the network access node according to the third aspect is that the cooling effect of the network access node is improved, and / or the cooling performance or cooling efficiency of the network access node is improved. Otherwise, the advantages of the network access node according to the third aspect correspond to the advantages of the device and its implementation or embodiment mentioned above or below. The network access node may include a base station. However, it should be understood that the implementation or embodiment of the device according to the first aspect of the present invention can be applied to units or devices different from the network access node for a wireless communication system.

[0053] Other applications and advantages of implementations or embodiments of the present invention will be apparent from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The accompanying drawings are intended to illustrate and explain different embodiments of the present invention, in which:

[0055] Figure 1 is a schematic front view of an embodiment of the apparatus according to the first aspect of the present invention;

[0056] Figure 2 yes Figure 1 a schematic perspective front view of the device shown;

[0057] Figure 3 is a schematic cross-sectional view of a longitudinal channel with a flap of an embodiment of a device according to the first aspect of the present invention;

[0058] Figure 4 A front view schematically showing an example of the position of a flap in a longitudinal channel of an embodiment of the device according to the first aspect of the invention;

[0059] Figure 5a and Figure 5b is a schematic perspective view of a flap connected to a rigid member of an embodiment of the device according to the first aspect of the present invention;

[0060] Figure 6 is a partially schematic perspective front view of another embodiment of the device according to the first aspect of the present invention;

[0061] Figure 7is a schematic flow chart illustrating various aspects of an embodiment of a method according to the second aspect of the present invention. DETAILED DESCRIPTION

[0062] Figure 1 and Figure 2 An embodiment of a device 102 according to the first aspect of the invention is schematically shown, and when the device 102 is connected to a heat source 104, the device 102 is used to transfer heat from the heat source 104 to a fluid. The device 102 can be connected to one or more heat sources 104, for example, Figure 1 The two heat sources 104 shown, or a plurality of heat sources 104. The heat source 104 may include an electrical or electronic component connected to or mounted to a printed circuit board (PCB). The electrical or electronic component may be a transmitter, an optical transducer, a power amplifier, or any other heat generating component, or any other heat generating electrical or electronic component. However, it should be understood that in alternative embodiments, the heat source 104 may be a component that is not mounted to the PCB. One or more heat sources 104 and the PCB, etc. may be part of a network access node, etc., for a wireless communication system. The network access node may include a base station.

[0063] refer to Figure 1 and Figure 2 , the device 102 includes a heat sink 106. The heat sink 106 can be used for a fluid in the form of a gas or a gas mixture (e.g., air), but is not limited thereto. In some embodiments, the heat sink 106 can alternatively be used for a fluid in the form of a liquid or a liquid mixture, such as oil or any other liquid. For some embodiments, the fluid may include a mixture of gas and liquid, such as steam. The heat sink 106 includes a heat sink base 108 and two or more fins 110. Generally, heat from the heat source 104 is transferred to the fins 110, and the heat at the fins 110 is then transferred to the fluid near the fins 110. For some embodiments, the fins 110 can be connected to the heat sink base 108. The fins 110 can be connected to the heat sink base 108 by being connected to the heat sink base 108 or being formed integrally with the heat sink base 108. Reference Figure 2 The fin 110 has a longitudinal extension 111 extending along the longitudinal direction 112 (see Figure 3 ). The heat sink base 108 and the fins 110 form a longitudinal channel 114 for flowing fluid. For some embodiments, it can be described that the longitudinal channel 114 guides the fluid (e.g., in gas form and / or liquid form) through the heat sink 106 and enables heat from the fins 110 to be transferred to the fluid. The fluid can be naturally generated or forced to be generated, for example, by one or more fans. Therefore, in some embodiments, the heat sink 106 can be used in conjunction with one or more fans.

[0064] For some embodiments, such as Figure 1 and Figure 2 As shown, the heat sink 106 may include a heat sink top 116. When the heat sink top 116 is present, two or more fins 110 are located between the heat sink base 108 and the heat sink top 116, such that the heat sink base 108, the heat sink top 116, and the fins 110 together form a longitudinal channel 114. However, it should be understood that in some embodiments, the heat sink top 116 may not be included. When the heat sink 106 includes the heat sink top 116, a circumferentially closed longitudinal channel 114 or conduit is formed, such as Figure 1 and Figure 2 In an embodiment that does not include the heat sink top 116, a circumferentially open longitudinal channel 114 is formed instead. The fins 110 may be integrally formed with the heat sink top 116 or connected to the heat sink top 116 in other ways.

[0065] refer to Figure 1 , the heat sink 106 can be used to thermally couple to one or more heat sources 104 through the heat sink base 108 and / or the heat sink top 116. Therefore, one or more of the heat sink base 108 and the heat sink top 116 can be used to thermally couple to one or more heat sources 104. Therefore, the fins 110 can be thermally coupled to the heat sources 104 through the heat sink base 108 and / or the heat sink top 116. For some embodiments, the fins 110 can be thermally coupled to the heat sources 104 directly, i.e., not through the heat sink base 108 or the heat sink top 116.

[0066] refer to Figure 1 and Figure 2 The device 102 includes one or more flaps 118 having a longitudinal extension 119 (see Figure 5a). It should be understood that the flap 118 can be described as flexible or bendable, for example, a flexible or bendable tongue. The flap 118 can be called a reed, or a vibrating reed. The flap 118 is located in one of the longitudinal channels 114. Therefore, the flap 118 can be located between two fins 110. When the heat sink top 116 is used, the flap 118 can be located between the heat sink base 108 and the heat sink top 116. It can be described that one or more of the longitudinal channels 114 accommodate one or more of the flaps 118. Therefore, all of the longitudinal channels 114 of the heat sink 106 or a subset thereof can accommodate one or more flaps 118. When the longitudinal channel 114 accommodates more than one flap 118, the flaps 118 can be arranged one after another along the longitudinal direction 112, or arranged side by side, etc. For some embodiments, the flap 118 is spaced apart from the fins 110. The flap 118 may be located between the two fins 110 such that the flap 118 is spaced apart from the fins 110 and extends between the heat sink base 108 and the heat sink top 116. However, the flap 118 may be located in other locations, for example, as follows: Figure 4 described.

[0067] As described above, it should be understood that the flap 118 is flexible or bendable, i.e., not rigid. For example, the flap 118 can be made of a flexible or bendable material so that when fluid flows through the flap 118, the flap 118 begins to flip or flutter, i.e., moves in an oscillatory manner. In other words, the flap 118 can be used to flutter when the fluid flows through the longitudinal channel 114.

[0068] Figure 3 A flap 118 in a longitudinal channel 114 according to an embodiment of the present invention is schematically shown in a cross-sectional view. The flap 118 is arranged between the two fins 110 and is at a distance from each of the two fins 110. The longitudinal channel 114 may have an inlet 114a and an outlet 114b for the fluid. The flap 118 may be connected at a position close to the inlet 114a of the longitudinal channel 114, i.e., close to the position where the fluid enters the longitudinal channel 114. The inlet 114a may be formed by the leading edge of the longitudinal channel 114 or located at the leading edge of the longitudinal channel 114.

[0069] refer to Figure 3 , the flap 118 can be used to vibrate in the longitudinal channel 114. The vibrating motion provides turbulence in the fluid flowing through the longitudinal channel 114. Therefore, the flap 118 can be used to provide turbulence in the fluid. Figure 3, a fluid in gaseous or liquid form passing through the longitudinal channel 114 and the effect of the flap 118 on the fluid are shown. The cold fluid enters the longitudinal channel 114 at the inlet 114a, as indicated by the arrow 121. The fluid affects the flap 118 while flowing through the longitudinal channel 114, causing the flap 118 to vibrate at a given speed, as indicated by the dotted line around the flap 118. The vibration of the flap 118 introduces small-scale eddy motion in the fluid, breaking up the boundary layer and mixing the heated fluid near the fin 110 with the main flow of the initial cold fluid. At the outlet 114b of the longitudinal channel 114, the heated fluid leaves the longitudinal channel 114, as indicated by the arrow 123, and can be transported away.

[0070] refer to Figure 3 , the longitudinal extension 119 of the flap 118 may extend in the longitudinal direction 112, i.e., in the same direction as the longitudinal extension 111 of the fin 110. Therefore, the longitudinal extension 119 of the flap 118 may be substantially parallel to the longitudinal extension 111 of the fin 110. However, in some embodiments, the flap 118 may alternatively have a longitudinal extension 119 extending in a direction different from the longitudinal direction 112. For example, the longitudinal extension 119 of the flap 118 may extend at a certain angle to the longitudinal direction 112, for example, an angle in the range of zero to 180 degrees, such as a right angle. When there is fluid in the longitudinal channel 118, the flap 118 will vibrate. When there is fluid in the longitudinal channel 118, the vibrating angle may obviously vary continuously. The longitudinal extension 119 of the flap 118 can be considered to be the main extension of the flap 118 in an unaffected state (i.e., when not affected by the fluid in the longitudinal channel 114). Reference Figure 5a For some embodiments, the flap 118 may be described as having a lateral extension 125 that extends in a direction opposite to the direction of the longitudinal extension 119 of the flap 118 .

[0071] For some embodiments, flap 118 may replace fin 110 or a portion of fin 110. Figure 1 In a heat sink 106 having a plurality of evenly spaced fins 110, one or more of the fins 110 may be replaced with a flap 118 according to any of the embodiments described herein. Then, for example, the flap 118 may be located in the middle of two fins 110 where the other fin 110 would otherwise be located. The flap 118 may completely or partially replace the fin 110. Figure 3 For example, the middle fin 110a located between two other fins 110 can be completely or partially replaced by a flap 118. The flap 118 is located near the inlet 114a of the longitudinal channel 114. The middle fin 110a extending from the flap 118 along the rest of the longitudinal channel 114 may or may not exist. Figure 3The embodiment of the device 102 ensures that the pressure drop between the inlet 114a and the outlet 114b of the longitudinal channel 114 is not increased, while also enhancing the cooling performance.

[0072] The size of the flap 118 can be adjusted based on the size of other parts of the heat sink 106, and can also be adjusted according to specific cooling requirements. For example, the length of the longitudinal extension 119 of the flap 118 can be proportional to the spacing between the fins 110. In order to balance the cooling effect and the additional flow resistance, the ratio of the length of the longitudinal extension 119 of the flap 118 to the spacing between the fins 110 can be selected from 1.5:1 to 6:1, for example, 3:1 to 4:1. However, other ratios are also possible. If the spacing between two fins 110 is s, the length of the longitudinal extension 119 of the flap 118 can be selected to be approximately 2 to 6 times of s to achieve a proper balance. The thickness of the flap 118 can be selected based on various factors, such as the velocity of the fluid and the material of the flap 118. For example, in a high-density compact fin heat sink, the spacing between the fins 110 is small, and the thickness of the flap 118 can be selected to be 10m to 50m.

[0073] A material that is strong, durable, and has good thermal and dimensional stability can be selected as the material of the flap 118. In some embodiments, a material that can withstand temperatures up to 300° C. can be selected as the material of the flap 118. Potential materials for the flap 118 may include polymers, polymer composites, metals, metal alloys, fibers, textiles, and the like.

[0074] refer to Figure 1 and Figure 2 For some embodiments, a flap 118 is connected in the longitudinal channel 114. The flap 118 can be connected to one or more of the following components: the heat sink base 108, the heat sink top 116, and the fins 110. Figure 1 and Figure 2 In the illustrated embodiment, the flap 118 is connected to the heat sink base 108 and the heat sink top 116 and is located between two fins 110. However, in some embodiments, the flap 118 may be connected to only one of the heat sink base 108 and the heat sink top 116, or to only one or more of the fins 110. Figure 4 Five potential non-limiting embodiments or alternatives of connection of the flap 118 in the longitudinal channel 114 are schematically illustrated, for example, to one or more of the following components: the heat sink base 108 , the heat sink top 116 , and the fins 110 .

[0075] refer to Figure 5a and Figure 5bFor some embodiments, the device 102 may include one or more rigid members 120, wherein the flap 118 is connected to the rigid members 120. For some embodiments, the rigid members 120 may include pins. The rigid members 120 are in turn connected to one or more components of the group consisting of: the heat sink base 108, the heat sink top 116, and the fins 110. Figure 5a , the flap 118 may include a first end 118a and a second end 118b, wherein a longitudinal extension 119 of the flap 118 extends from the first end 118a to the second end 118b. The first end 118a of the flap 118 may be connected to the rigid member 120. The second end 118b of the flap 118 may represent a free end and may therefore be free to flutter. Figure 5b The rigid member 120 is schematically shown, wherein the flap 118 is connected in the longitudinal channel 114. Figure 5b In the illustrated embodiment, the rigid member 120 is connected to the heat sink substrate 108 between the two fins 110 so that the first end 118a is spaced apart from the fin 110. The rigid member 120 may be made of a material including a polymer, a polymer composite, a metal, or a metal alloy. For some embodiments, the rigid member 120 may not be included.

[0076] refer to Figure 5b , the flap 118 and / or the rigid member 120 can be movably or non-movably connected to one or more of the following components: the heat sink base 108, the heat sink top 116, and the fins 110. The flap 118 and / or the rigid member 120 can be movably or non-movably connected to each other. In other words, the flap 118 or the rigid member 120 can be arranged to move (e.g., rotate or fix) relative to one or more components to which it is connected. For example, the flap 118 and / or the rigid member 120 can be movably connected by mechanical locking, such as by any one of the group consisting of the following connections: a threaded connection, a friction connection, a positive locking connection, a bayonet connection, a snap connection, and a snap-in connection. For some embodiments, for example, the flap 118 and / or the rigid member 120 can be non-movably connected by an adhesive or welding.

[0077] For some embodiments, the flap 118 and / or the rigidizer 120 may be integrally formed with each other and with one or more of the following components: the heat sink base 108 , the heat sink top 116 , and the fins 110 .

[0078] In some embodiments, the rigid member 120 may be immovable relative to one or more of the following components: the heat sink base 108, the heat sink top 116, and the fins 110, wherein the first end 118a of the flap 118 may be immovable relative to the rigid member 120. For example, the first end 118a of the flap 118 may be glued or welded to the rigid member 120. For example, the rigid member 120 may be glued or welded to one or more of the following components: the heat sink base 108, the heat sink top 116, and the fins 110. However, several other alternatives are possible.

[0079] refer to Figure 6 , schematically shows another embodiment of the device 202 according to the first aspect of the present invention, when the device 202 is connected to a heat source, the device 202 is used to transfer heat from the heat source to a fluid. Figure 6 Several features of embodiments of the apparatus 202 may correspond to Figure 1 The features of the embodiment of the device 102 of FIG. 5 are not described here in detail to avoid repetition. Figure 6 In the illustrated embodiment, the device 202 includes seven flaps 118, wherein the flaps 118 are located in one of the longitudinal channels 114. However, for other embodiments, the device 202 may include more than seven flaps 118. For some embodiments, the same longitudinal channel 114 may accommodate two or more flaps 118. Figure 6 In the illustrated embodiment, the rigid member 120 to which the flap 118 is attached is secured in a groove 222 formed in the heat sink top 116. Additionally or alternatively, the rigid member 120 may be secured in a groove in the heat sink base 108. For some embodiments, the flap 118 may replace the fin 110 and take its place. For some embodiments, the flap 118 may replace a longitudinal portion of the fin 110, and the fin 110 substantially aligned with the rigid member 120 may continue in the longitudinal direction 112 after the flap 118 or before the flap 118. For some embodiments, 30 mm to 50 mm of the front end of the fin 110 may be removed and replaced with the flap 118. For some embodiments, the rigid member 120 may be located 4 mm to 10 mm from the leading edge 224 of the longitudinal channel 114. Other distances from the leading edge 224 are also possible. For some embodiments, when there is no flap 118 between two adjacent fins 110, the interval may be 2 mm to 3 mm. For some embodiments, when there is a flap 118 between two adjacent fins 110, the interval may be 4 mm to 6 mm. However, other sizes are also possible.

[0080] refer to Figure 7, schematically illustrates various aspects of an embodiment of a method for producing or manufacturing a device 102 according to a second aspect of the invention, the device 102 being used to transfer heat from the heat source 104 to a fluid when the device 102 is connected to a heat source 104. The device 102 may be a device in any of the above-described embodiments of the device 102 according to the first aspect. The method comprises the step of connecting 701 one or more flaps 118 having a longitudinal extension 119 in one or more longitudinal channels in the longitudinal channel 114. The one or more flaps 118 may be connected in any of the above-described ways.

[0081] The components or units of the heat sink 106, 206 can be made of any suitable material, for example, a thermally conductive material, for example, any suitable metal or metal alloy such as aluminum, copper, or any thermally conductive polymer or polymer composite material. As described above, the fluid can be a gas or a gas mixture, including air, Freon, or any other suitable gas or gas mixture, and the fluid can also be a liquid such as water, or a fluid known by the name of R135A or R1233ZD, or any other suitable liquid. For some embodiments, the fins 110 do not have to be parallel to each other.

[0082] Embodiments of the present invention also include a network access node for a wireless communication system, wherein the network access node includes an apparatus 102, 202 according to any of the embodiments disclosed above. The network access node herein may also be represented as a wireless network access node, an access network access node, an access point or a base station, for example, a radio base station (Radio Base Station, RBS), which may be referred to as a transmitter, "gNB", "gNodeB", "eNB" in some networks. "eNodeB", "NodeB" or "B node", depending on the technology and terminology used. Depending on the transmission power and cell size, wireless network access nodes may belong to different categories, for example, macro eNodeB, home eNodeB or micro base station. The wireless network access node may be a station (STA), which is any device including a media access control (MAC) and physical layer (PHY) interface to a wireless medium (Wireless Medium, WM) that complies with IEEE 802.11. The wireless network access node may also be a base station corresponding to a fifth generation (5G) wireless system. The network access node may include an active antenna, a remote radio unit (RRU) or a baseband processor. The network access node may include one or more antennas. The network access node may have a housing for accommodating the antenna. Alternatively, the antenna may be mounted outside the housing of the network access node, for example, at a certain distance from the housing of the network access node.

[0083] Finally, it should be understood that the present invention is not limited to the embodiments described above, but also relates to and incorporates all embodiments within the scope of the appended independent claims.

Claims

1. A device (102; 202), characterized in that: When the device (102) is connected to a heat source (104), the device (102) is used to transfer heat from the heat source (104) to a fluid; the device (102) comprises a heat sink (106; 206), the heat sink (106; 206) comprising: a heat sink substrate (108); Two or more fins (110), wherein The fin (110) has a longitudinal extension portion (111) extending along a longitudinal direction (112); The heat sink base (108) and the fins (110) form a longitudinal channel (114) for flowing the fluid; The device (102) comprises one or more flaps (118) having a longitudinal extension (119), wherein: The flap (118) is located in one of the longitudinal channels (114).

2. The device (102; 202) according to claim 1, characterized in that The heat sink (106; 206) includes a heat sink top (116), the two or more fins (110) being located between the heat sink base (108) and the heat sink top (116), wherein: The heat sink base (108), the heat sink top (116) and the fins (110) together form the longitudinal channel (114).

3. The device (102; 202) according to claim 1 or 2, characterized in that The longitudinal extension (119) of the flap (118) extends along the longitudinal direction (112).

4. The device (102; 202) according to any one of claims 1 to 3, characterized in that The flap (118) is configured to vibrate when the fluid flows through the longitudinal channel (114).

5. The device (102; 202) according to claim 4, characterized in that The flap (118) is configured to vibrate in the longitudinal channel (114).

6. The device (102) according to any one of claims 1 to 5, characterized in that The flap (118) is used to provide turbulence in the fluid.

7. The device (102; 202) according to any one of claims 1 to 6, characterized in that The longitudinal channel (114) has an inlet (114a) and an outlet (114b) for the fluid, wherein: The flap (118) is connected at a position close to the inlet (114a) of the longitudinal channel (114).

8. The device (102; 202) according to any one of claims 1 to 7, characterized in that The flap (118) is connected in the longitudinal channel (114).

9. The device (102; 202) according to any one of claims 1 to 8, characterized in that The flap (118) is connected to one or more components of the group consisting of: The heat sink substrate (108); The radiator top (116); The fins (110).

10. The device (102; 202) according to any one of claims 1 to 9, characterized in that The device (102) includes one or more rigid members (120), wherein: The flap (118) is connected to the rigid member (120); The rigid member (120) is connected to one or more components selected from the group consisting of: The heat sink substrate (108); The radiator top (116); The fins (110).

11. The device (102; 202) according to claim 10, characterized in that The rigid member (120) is immovable relative to one or more of: the heat sink base (108), the heat sink top (116), and the fins (110), wherein: The flap (118) includes a first end (118a) and a second end (118b); The longitudinal extension (119) of the flap (118) extends from the first end (118a) to the second end (118b); The first end portion (118a) of the flap (118) is connected to the rigid member (120); The first end (118a) of the flap (118) is immovable relative to the rigid member (120).

12. The device (102; 202) according to any one of claims 1 to 11, characterized in that The flap (118) is spaced apart from the fin (110).

13. The device (102; 202) according to any one of claims 1 to 12, characterized in that The heat sink (106; 206) is for a fluid in the form of a gas or a gas mixture.

14. A method for producing a device (102; 202), characterized in that When the device (102; 202) is connected to a heat source (104), the device (102; 202) is used to transfer heat from the heat source (104) to a fluid; the device (102; 202) comprises a heat sink (106; 206), the heat sink (106; 206) comprising: a heat sink substrate (108); Two or more fins (110), wherein The fin (110) has a longitudinal extension portion (111) extending along a longitudinal direction (112); The heat sink base (108) and the fins (110) form a longitudinal channel (114) for flowing the fluid; The method comprises: One or more flaps (118) having a longitudinal extension (119) are connected (701) in one or more of the longitudinal channels (114).

15. A network access node for a wireless communication system, characterized in that: The network access node comprises an apparatus (102; 202) according to any one of claims 1 to 13.

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