TWI753320B - Heat dissipation unit and heat dissipation device using same - Google Patents

Abstract

A heat dissipation unit and a heat dissipation device using same are disclosed. The heat dissipation device includes a base and one or more heat dissipation units. The base has a first side and an opposite second side; and the heat dissipation units respectively include at least one radiation fin correspondingly provided on the first side of the base. The radiation fin is formed by correspondingly closing a first plate member and a second plate member to each other, such that a plurality of independent flow channels is defined between the closed first and second plate member. The independent flow channels communicate with each other. And, the independent flow channels respectively have an amount of working fluid filled therein.

Description

Cooling unit and its cooling device

The present invention relates to a heat dissipation unit and a heat dissipation device thereof, in particular to a heat dissipation unit and a heat dissipation device thereof which greatly increase the heat dissipation efficiency.

The current mobile devices, personal computers, servers, communication boxes or other systems or devices have improved computing performance, and the heat generated by their internal computing units has also increased, so relatively more heat dissipation units are needed to assist their heat dissipation. The vast majority of manufacturers use cooling elements such as radiators, heat pipes, and vapor chambers with fans for auxiliary cooling, and when a large area is required for cooling, they use cooling devices (radiators) and cooling fans for forced cooling.

Generally, common heat dissipation devices (heat sinks) in the industry are composed of a substrate and a plurality of heat dissipation fins, and these heat dissipation fins are arranged on one side of the substrate. Under the condition that the heat generated inside each device is also gradually increasing, the size of the heat dissipation fins on the substrate must also be relatively increased and increased in order to obtain a larger and more heat dissipation area so as to dissipate the heat inside each device. However, the heat dissipation fins The heat dissipation efficiency of the sheet will gradually decrease with the increase of its height, thereby causing the overall heat dissipation efficiency of the heat dissipation device to decrease.

As mentioned above, the conventional one has the following disadvantages: 1. The heat dissipation efficiency is extremely poor; 2. The volume of the heat dissipation device is too large.

Therefore, how to solve the above-mentioned conventional problems and deficiencies is the direction that the inventor of this case and the relevant manufacturers engaged in this industry are eager to research and improve.

Therefore, in order to effectively solve the above problems, the main purpose of the present invention is to provide a heat dissipation unit that greatly increases the heat dissipation efficiency.

A secondary objective of the present invention is to provide a heat dissipation unit that can greatly reduce the volume of the heat dissipation device.

A secondary objective of the present invention is to provide a heat dissipation device that greatly increases heat dissipation efficiency.

A secondary objective of the present invention is to provide a heat dissipation device that can greatly reduce the volume of the heat dissipation device.

In order to achieve the above object, the present invention provides a heat dissipation unit, which has at least one heat dissipation fin. The plate bodies together define a plurality of independent flow channels, the independent flow channels are communicated with each other, and a working fluid is filled in the independent flow channels.

In order to achieve the above object, the present invention provides a heat dissipation device, which includes a base and a heat dissipation unit, the base has a first side and a second side, and the heat dissipation unit has at least one heat dissipation fin correspondingly disposed on the heat dissipation unit. On the first side, the heat dissipation fin is composed of a first plate body and a second plate body correspondingly covered, and the first and second plate bodies together define a plurality of independent flow channels, and the independent flow channels are mutually These independent flow channels are filled with a working fluid (optionally ammonia or refrigerant or water or hydrocarbons or other compounds).

Through the design of the structure of the present invention, through the structural design of independent flow channels connected to each other in the heat dissipation fins, when the second side of the base is in contact with a heat source, the heat generated by the heat source will be generated by the heat source. The second side of the base is transferred to the first side and then transferred to the heat dissipation fin, and then the heat is transferred to the independent flow channels, so that the working fluid in the independent flow channels connected to each other forms a gaseous state, and the The gaseous working fluid will quickly bring heat to the other end away from the heat source, and after the gaseous working fluid is condensed and condensed into a liquid working fluid, it is then passed through the inner wall of the independent flow channel. One less capillary structure returns the liquid working fluid to the heat dissipation fin near the end of the heat source, thus forming a heat dissipation fin with continuous circulation of gas and liquid two phases, achieving the effect of rapid heat dissipation, and can greatly improve the heat dissipation efficiency of the heat dissipation device .

In addition, through the design of the independent flow channels in the heat dissipation fins that communicate with each other, the problem of extremely poor heat dissipation efficiency caused by the excessively large heat dissipation fins of the conventional heat dissipation device can be improved. The present invention utilizes a gas-liquid two-phase circulation The structure design of the independent flow channel can make the heat dissipation device small but not affect its heat dissipation efficiency or even better than the conventional heat dissipation device.

2: cooling unit

20: cooling fins

201: The first board body

202: Second plate body

21a, 21b: Independent flow channel

211a, 211b: away from the heat source

212a, 212b: near the heat source end

210: Groove

211: The first groove

212: The second groove

22: Working fluid

23: capillary structure

24: Filling port

25: Ribs

3: Base

30: First side

300: Groove

31: Second side

4: cooling device

5: heat source

Figure 1 is an exploded perspective view of the first embodiment of the heat dissipation unit of the present invention; Figure 2 is a cross-sectional view of the first embodiment of the heat dissipation unit of the present invention; Figure 3 is the second embodiment of the heat dissipation unit of the present invention Figure 4 is a perspective combined view of the second embodiment of the heat dissipation unit of the present invention; Figure 5 is a cross-sectional view of the second embodiment of the heat dissipation unit of the present invention; Figure 6 is the heat dissipation unit of the present invention. FIG. 7 is a three-dimensional combined view of the first and second embodiments of the heat dissipation device of the present invention; and FIG. 8 is a cross-sectional view of the second embodiment of the heat dissipation device of the present invention.

The above-mentioned objects of the present invention and their structural and functional characteristics will be described with reference to the preferred embodiments of the accompanying drawings.

Please refer to FIGS. 1 and 2, which are an exploded perspective view and a cross-sectional view of a first embodiment of a heat dissipation unit of the present invention. As shown in the figures, a heat dissipation unit 2 has at least one heat dissipation fin 20. The heat dissipation fin 20 It is composed of a first plate body 201 and a second plate body 202 correspondingly covered together. In this embodiment, at least one groove 210 is formed on the first plate body 201 (of course, it can also be selected in the first plate body 201 ). The grooves 210 are formed on the second plate body 202, and this embodiment is described with the first plate body 201). Example The first plate body 201 of the heat dissipation fin 20 has a groove 210 structure, and the second plate body 202 is a flat body (without the groove 210 structure); the first and second plate bodies 201 The grooves 210 of the first plate body 201 and the second plate body 202 form a plurality of independent flow channels 21a and 21b, which are arranged in a staggered arrangement of long and short lengths (the figure shows that the independent flow channels 21a are opposite to each other). The independent flow channel 21b is longer; that is, the independent flow channel 21b is shorter), and each independent flow channel 21a, 21b has a heat source end 212a, 212b and a heat source end 211a, 211b away, adjacent independent The ends 212a and 212b near the heat source and the ends 211a and 211b away from the heat source of the flow channels 21a and 21b are arranged at different heights. The independent flow channels 21a, 21b communicate with each other, and the independent flow channels 21a, 21b are filled with a working fluid 22 located near the heat source ends 212a, 212b for gas-liquid circulation. The inner walls of the flow channels 21a and 21b can be further provided with at least one capillary structure 23 (please refer to Figures 1 and 2) or a coating film, and the capillary structure 23 can be selected as a mesh body or a fiber body or a structure with porous properties. The purpose of either the body or the groove is to increase the efficiency of the gas-liquid circulation of the working fluid 22 in the independent flow channels 21a, 21b.

The coating film may be provided on the inner walls of the independent flow channels 21 a and 21 b or the capillary structure 23 or both may be provided.

Please refer to Figures 3, 4, and 5, which are perspective views and cross-sectional views of the second embodiment of the heat dissipation unit of the present invention. The difference between the second embodiment and the first embodiment is that the first plate body of the heat dissipation fin 20 At least one first groove portion 211 is formed on the 201, and at least one second groove portion 212 is formed on the second plate body 202, that is, the first and second plate bodies 201, 202 are formed with grooves structure, the first and second plate bodies 201 and 202 are correspondingly covered so that the first and second grooves 211 and 212 constitute the independent flow channels 21 a and 21 b, and the independent flow channels 21 a and 21 b The working fluid 22 is likewise filled.

The manufacturing process of the aforementioned heat dissipation fins 20 is generally as follows: first, one of the first and second plate bodies 201 and 202 is machined to form the aforementioned grooves 210 , or the The first and second grooves 211 and 212 are formed by machining the first and second plate bodies 201 and 202. In the machining process, the aforementioned grooves 210 or the first and second grooves 211 and 212 are formed by stamping, and then the first and second plates 201 and 202 are covered by welding or other bonding methods. The grooves 210 formed on the first plate body 201 or the second plate body 202 (or the first groove portion 211 formed on the first plate body 201 and the second groove portion formed on the second plate body 202 212) The structure of the independent flow channels 21 a and 21 b described above is formed, and then the independent flow channels 21 a and 21 b are evacuated and filled with a filling port 24 (as shown in FIG. 4 ) of the heat dissipation fin 20 at the same time. After entering the working fluid 22 (which can be any of ammonia or refrigerant or water or hydrocarbons or other compounds) and then sealing the periphery of the grooves 210 and the filling port 24, the heat dissipation of the present invention is formed. Fin 20 structure.

In addition, it should be added that the shape, size, arrangement and arrangement direction of the aforementioned grooves 210 (or the first and second grooves 211 and 212 ) are not particularly limited. For example, the grooves 210 may have different lengths. The staggered arrangement is formed on the first and second plate bodies 201 and 202, or the arrangement direction of the grooves 210 can be straight side-by-side or oblique side-by-side (as shown in FIG. 4) formed on the first , the two plate bodies 201, 202, which can be adjusted according to the needs of the user; as long as the groove 210 (or the first and second groove parts 211, 212) The above-mentioned structural aspects of the independent flow channels 21 a and 21 b formed by the cover are all included in the scope of the present invention, which will be described first; in addition, the inner walls and capillary structures of the independent flow channels 21 a and 21 b or the two The above-mentioned coating film (not shown) can be further arranged between them to increase the efficiency of the gas-liquid circulation of the working fluid 22 in the independent flow channels 21a and 21b.

Please refer to FIG. 6 again, which is a perspective view of a third embodiment of the heat dissipation unit of the present invention. The difference from the first embodiment is that the heat dissipation fins 20 are further formed with a plurality of ribs 25, and the number of the ribs 25 is not limited. And the direction of setting (can be horizontal or vertical direction or staggered), which is adjusted according to the needs of users, and the function of the rib 25 structure is to increase the structural strength of the heat dissipation fins 20, so as to dissipate heat The fins 20 are not easily deformed.

Please also refer to FIG. 7, which is a three-dimensional combined view of the first and second embodiments of the heat dissipation device of the present invention. The heat dissipation device 4 is formed by combining the aforementioned heat dissipation unit 2 with a base 3. The base 3 has A first side 30 and a second side 31, and the first side 30 forms at least one insert groove 300, the heat dissipation fins 20 are correspondingly fixed in the insert groove 300, and the fixing method of the heat dissipation fins 20 The system can be fixed in the inserting groove 300 by any method of fitting or riveting or welding or gluing or clamping.

Please also refer to FIG. 8 , through the design of the structure of the present invention, the independent flow channels 21 a and 21 b that communicate with each other are arranged in the heat dissipation fins 20 , when the second part of the base 3 is When the side 31 is in contact with a heat source 5, the heat generated by the heat source 5 will be transferred from the second side 31 of the base 3 to the first side 30 and then transferred to the heat dissipation fin 20, and then the heat will be transferred to the independent In the flow channels 21 a, 21 b, the working fluid 22 in the independent flow channels 21 a, 21 b is formed into a gaseous state, and the gaseous working fluid 22 will quickly bring heat to the other end away from the heat source 5 (that is, the end away from the heat source). 211a, 211b), and after the gaseous working fluid 22 is aggregated and condensed into a liquid working fluid 22, the liquid working fluid 22 is returned to the end ( That is, at the heat dissipation fins 20 close to the heat source ends 212a, 212b), a heat dissipation fin 20 in which gas and liquid two phases are continuously circulated is formed to achieve the effect of rapid heat dissipation, thereby greatly improving the heat dissipation efficiency of the heat dissipation device 4.

In addition, through the structural design of the independent flow channels 21 a and 21 b in the heat dissipation fin 20 of the present invention, the problem of extremely poor heat dissipation efficiency caused by the excessively large volume of the heat dissipation fin 20 of the conventional heat dissipation device 4 can be improved. The structure design of the independent flow channels 21a and 21b with gas-liquid two phases enables the heat dissipation device 4 to be small in size without affecting its heat dissipation efficiency and even better than the conventional heat dissipation device.

As mentioned above, the present invention has the following advantages compared with the prior art: 1. Greatly improve the heat dissipation efficiency; 2. Greatly reduce the volume of the heat dissipation device.

The present invention has been described in detail above, but the above is only one of the preferred embodiments of the present invention The examples are only examples, which cannot limit the scope of implementation of the present invention, that is, all equivalent changes and modifications made according to the scope of the application of the present invention should still fall within the scope of the patent of the present invention.

2: cooling unit

201: The first board body

202: Second plate body

21: Independent runner

210: Groove

23: capillary structure

Claims (18)

A heat dissipation unit, which has at least one heat dissipation fin, the heat dissipation fin is composed of a first plate body and a second plate body correspondingly covered, and the first and second plate bodies jointly define a plurality of independent flow channels in the form of The lengths and the shorts are arranged in a staggered arrangement, and each independent flow channel has an end close to the heat source and an end far away from the heat source, the independent flow channels are connected to each other, and a working fluid is filled in the independent flow channels at the end close to the heat source, and is in phase with each other. The ends of the adjacent independent flow channels near the heat source and the ends far from the heat source are arranged in different heights. The heat dissipation unit according to claim 1, wherein the heat dissipation fin further has at least one groove, the groove is formed on either the first plate body or the second plate body, the first, The two plates are covered correspondingly so that the groove forms the independent flow channel. The heat dissipation unit according to claim 1, wherein the heat dissipation fin further has a plurality of grooves, the grooves further have at least one first groove portion and at least one second groove portion, the first groove portion is formed in the On the first plate body, the second groove portion is formed on the second plate body, and the first and second plate bodies are covered together so that the first and second groove portions constitute the independent flow channel. The heat dissipation unit according to claim 2 or 3, wherein the groove is formed by machining, and the machining is stamping. The heat dissipation unit according to claim 2 or 3, wherein the grooves can be formed on the first and second plates in a staggered arrangement of long and short lengths, or the grooves can be formed in a vertical side-by-side or oblique side-by-side on the first and second plates. The heat dissipation unit according to claim 1, wherein the inner wall of the independent flow channel is further provided with at least one capillary structure, and the capillary structure is any one of a mesh body, a fiber body, a structure body with porous properties, or a groove. . The heat dissipation unit according to claim 6, further comprising a coating film correspondingly disposed on the inner wall of the independent flow channel or any one of the capillary structures or the inner wall of the independent flow channel and the capillary The structure is set at the same time. The heat dissipation unit according to claim 1, wherein the heat dissipation fins further form a plurality of ribs, and the ribs are arranged in a transverse or longitudinal direction or staggered, and the ribs are used to increase the structural strength of the heat dissipation fins. A heat dissipation device includes: a base with a first side and a second side; and a heat dissipation unit with at least one heat dissipation fin correspondingly disposed on the first side, the heat dissipation fin is It is composed of a first plate body and a second plate body correspondingly covered, and the first and second plate bodies jointly define a plurality of independent flow channels arranged in a staggered arrangement, and each independent flow channel has an end close to the heat source and a Away from the heat source end, the independent flow channels are connected to each other, a working fluid filled in the independent flow channels is located at the heat source end, and the adjacent independent flow channels are of different heights near the heat source end and away from the heat source end set up. The heat dissipation device according to claim 9, wherein the heat dissipation fin further has at least one groove, and the groove is formed on either the first plate body or the second plate body, and the first, The two plates are correspondingly covered so that the groove forms the independent flow channel. The heat dissipation device of claim 9, wherein the heat dissipation fin further has a plurality of grooves, the grooves further have a first groove portion and a second groove portion, and the first groove portion is formed in the first groove portion. On a plate body, the second groove portion is formed on the second plate body, and the first and second plate bodies are covered together so that the first and second groove portions form the independent flow channel. The heat sink according to claim 10 or 11, wherein the grooves are formed by machining, and the machining is stamping. The heat dissipation device according to claim 10 or 11, wherein the grooves can be formed on the first and second plates in a staggered arrangement of lengths and shorts, or the grooves can be formed in a vertical side-by-side or oblique side-by-side on the first and second plates. The heat dissipation device according to claim 9, wherein the inner wall of the independent flow channel is further provided with at least one capillary structure, and the capillary structure is any one of a mesh body, a fiber body, a structure body with porous properties, or a groove. . The heat dissipation device according to claim 14, further comprising a coating film correspondingly disposed on the inner wall of the independent flow channel or any one of the capillary structures or the inner wall of the independent flow channel and the capillary The structure is set at the same time. The heat dissipation device according to claim 9, wherein the heat dissipation fins further form a plurality of ribs, and the ribs are arranged in a transverse or longitudinal direction or staggered, and the ribs are used to increase the structural strength of the heat dissipation fins. The heat dissipation device according to claim 9, wherein at least one insert groove is formed on the first side of the base, and the heat dissipation fins are correspondingly fixed in the insert groove. The heat dissipating device of claim 17, wherein the heat dissipating unit is fixed in the inserting groove by any means of fitting, riveting, welding, gluing, or snapping.

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