CN218723413U - Phase change heat extraction device for enhancing working medium supplement capability of evaporation section - Google Patents
Phase change heat extraction device for enhancing working medium supplement capability of evaporation section Download PDFInfo
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Abstract
The utility model relates to a phase-change heat-taking device for enhancing the working medium supplement ability of an evaporation section, a phase-change cavity is arranged on a heat-radiating main body of the device, a combined micro-groove structure is arranged on a phase-change cavity bottom plate, and a heat source is arranged below the phase-change cavity bottom plate; the middle part of the combined micro-groove structure is a parallel micro-groove structure, a radial channel structure is arranged around the parallel micro-groove structure, and an annular micro-groove is arranged between the parallel micro-groove structure and the radial channel structure. The utility model discloses can strengthen the working medium replenishing capacity of bottom plate, improve heat abstractor stability.
Description
Technical Field
The utility model belongs to the technical field of heat abstractor, a phase transition of reinforcing evaporation zone working medium replenishing capacity gets heat facility is related to.
Background
The LED light source has the characteristics of high photoelectric conversion efficiency, capability of greatly reducing energy consumption, small volume and long service life, so that the LED light source can quickly replace the traditional incandescent lamp, fluorescent lamp, metal halide lamp, high-voltage sodium lamp and the like, and is widely applied in various fields. The LED light source has strict requirements on temperature and high requirements on a matched heat radiator.
At present, the LED lamp usually adopts a natural convection heat dissipation mode, so the heat taking capacity and the heat conducting capacity of a heat radiator directly influence the heat dissipation level of the lamp. Different heat dissipation forms are adopted in the industry for different power levels, such as: the low-power lamp generally adopts a metal material with high heat conductivity coefficient, and adopts a heat-taking and heat-conducting structure of a phase-change cavity, a heat pipe and a heat column for the medium-power and high-power grade lamps. The phase-change cavity structure radiator has the advantages of simple structure and convenience in assembly, and is widely applied to structural forms.
In the Chinese patent publication, a phase-change liquid and a heat transfer module containing the phase-change liquid are disclosed (application number: CN 201811049591.6), in order to strengthen the heat-taking capability of a phase-change cavity structure radiator and reduce the heat-taking temperature difference, a parallel micro-groove structure is processed on the opposite side surface of a heat-taking surface. The structure does not distinguish and divide the functions of the heating surface, the completely parallel micro-groove structure on the whole heating surface enables the working medium in the surrounding area to freely flow along the channel direction, the micro-groove can only provide capillary driving force in the direction, and the vertical micro-groove direction and the micro-groove direction can generate obstruction to the backflow of the working medium, thereby causing untimely working medium supplement and local dry phenomenon, and influencing the reliability of the device.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a hot dress is got in phase transition that working medium backward flow resistance is low, boiling zone can obtain that working medium steadily supplements and get the reliable and stable reinforcing evaporation zone working medium of heat-transfer ability and supply ability.
In order to solve the technical problem, the phase change heat taking device for enhancing the working medium replenishing capacity of the evaporation section of the utility model is provided with a phase change cavity on the heat dissipation main body, wherein the phase change cavity is a vacuum cavity and is filled with the working medium; the device is characterized in that a combined micro-groove structure is arranged on the phase change cavity bottom plate, and a heat source is arranged below the phase change cavity bottom plate; the middle part of the combined micro-groove structure is a parallel micro-groove structure, a radial channel structure is arranged around the parallel micro-groove structure, and an annular micro-groove is arranged between the parallel micro-groove structure and the radial channel structure.
The area of the parallel micro-groove structure is S p The heat source is square, the geometric side length is B, and S is more than or equal to 0.15 p /B 2 Less than or equal to 0.25; the depth of the parallel microgrooves in the structure is h p ，200μm≤h p Less than or equal to 2500 mu m, the width of the parallel microgrooves is W p ，0.5≤W p /h p Less than or equal to 1, and the period length of the parallel microgrooves is 2W p 。
In the radial channel structure, the depth of the radial channel is set to be h f Minimum width is W f ，0.9≤h f /h p ≤1，1≤W f /W p ≤1.1。
The depth of the annular micro groove is h h ＝h f Width is W h ，0.9≤W h /W f ≤1.1。
A funnel-shaped confluence arc plate is also fixedly arranged in the phase change cavity, the height of the edge of the confluence arc plate in the phase change cavity is M, M is more than 0.05H and less than or equal to 0.5H, and H is the height of the phase change cavity; the plate surface of the confluence arc plate is provided with a plurality of steam passing holes, and the lower end of the confluence arc plate is provided with a flow outlet.
The sum of the areas of all the steam passing holes is 5-20% of the area of the bottom surface of the phase change cavity.
And a telescopic gap 53 with a central angle of 10-30 degrees is radially arranged on the confluence arc plate.
The edge of the upper end of the confluence arc plate is provided with a connecting ring, and the connecting ring is embedded in a connecting groove in the circumferential direction of the side wall of the phase change cavity.
The upper surface of the confluence arc plate is a super-hydrophobic surface.
The lateral wall of the phase change cavity is provided with a vertical channel which is parallel to the axis of the phase change cavity.
Advantageous effects
1. The combined micro-groove structure on the phase change cavity bottom plate is divided into a middle boiling area and a peripheral backflow area according to the functionality of the combined micro-groove structure, the boiling area is arranged into a micron-sized parallel micro-groove structure capable of strengthening boiling heat exchange, and the backflow area is arranged into a millimeter-sized radial channel structure capable of reducing flow resistance, so that the working medium supplement capacity of the bottom plate is enhanced, and the stability of the heat dissipation device is improved.
2. By adopting the structure of the confluence arc plate, the vapor-state working medium in the phase change heat dissipation device can be collected under the condition that the phase change of the working medium is not influenced, and is converged right above the boiling surface of the bottom plate of the phase change cavity, and the collected liquid drops fall back to the boiling surface, so that the strong disturbance of the fluid at the solid-liquid junction is caused, the heat exchange coefficient of the boiling surface is improved, the heat exchange capacity of the boiling surface is enhanced, the boiling overheating temperature difference of the heat taking plate is reduced, and the heat dissipation capacity of the heat dissipation device is enhanced.
3. The inner wall of the phase change cavity is provided with a vertical channel structure, and working media are gathered at the bottom of the channel and are conveyed together under the action of liquid tension, so that the flow resistance of condensed working media can be reduced, a liquid film can be prevented from being formed at the top of the channel, and the heat exchange capacity of the working media during condensation is enhanced.
The utility model discloses but furthest improves heat abstractor's radiating efficiency, can guarantee that the high power device keeps lower temperature in the use, can be applied to LED lamps and lanterns, high performance computer, high-power laser instrument, high-power electronic equipment's energy-conserving heat management.
Drawings
Fig. 1 is an exploded view of the overall structure of the present invention.
FIG. 2a is a top view of the heat dissipating body; FIG. 2b is an enlarged view of the vertical channel; fig. 2c is a perspective view of the heat dissipating body.
Fig. 2d is a partial enlarged view of the inner wall of the phase change chamber.
Fig. 3 is a perspective view of a combined micro-groove structure.
Fig. 4 is a perspective view of the bus arc plate.
FIG. 5 is a schematic view of the installation position of the bus arc plate in the phase change chamber.
Fig. 6 is a partially enlarged view of fig. 5.
FIG. 7 is an exploded view of another embodiment of the present invention
In the figure: 1. the heat dissipation structure comprises a heat dissipation main body, 11 phase change cavities, 111 vertical channels, 112 connecting grooves, 12 heat dissipation fins, 2a base plate, 21 parallel micro-groove structures, 22 radial channel structures, 23 annular micro-grooves, 3 condensation upper covers, 4 sealing screws, 5 confluence arc plates, 51 steam passing holes, 52 outflow ports, 53 telescopic gaps and 54 connecting rings.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, it being understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other suitable relationship. The specific meaning of the above terms in the present invention can be specifically understood in specific cases for those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," or "beneath" a second feature includes the first feature being directly under or obliquely below the second feature, or simply means that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example 1
As shown in figure 1, the utility model discloses a phase transition of reinforcing evaporation zone working medium replenishing capacity gets heat device is including heat dissipation main part 1, base plate 2, condensation upper cover 3, sealing screw 4, the arc board 5 that converges.
As shown in fig. 2a, fig. 2b, fig. 2c, and fig. 2d, the heat dissipation body 1 has a phase change cavity 11 and a plurality of heat dissipation fins 12 arranged in parallel outside the phase change cavity 11, an inner cavity of the phase change cavity 11 is a phase change cavity, and a working medium is filled in the phase change cavity. The bottom end of the phase change cavity is sealed by the substrate 2, the top end of the phase change cavity is sealed by the condensation upper cover 3, and the condensation upper cover 3 is provided with a sealing screw 4 for vacuum treatment of the phase change cavity.
The lateral wall in phase transition chamber is provided with vertical channel 111, and vertical channel 111 is parallel with the axis in phase transition chamber, through the tension effect of liquid working medium, concentrates the condensate liquid in vertical channel bottom, can promote the working medium and form the pearl at phase transition intracavity wall and condense, promotes heat transfer ability. The phase change cavity side wall is provided with a circumferential connecting groove 112 for fixing the bus arc plate 5.
As shown in fig. 3, the bottom of the phase change cavity on the substrate 2 is used as a bottom plate of the phase change cavity, and has a combined micro-groove structure thereon, and the LED light source is disposed below the substrate 2 at a position corresponding to the combined micro-groove structure; the middle part of the combined micro-groove structure is a parallel micro-groove structure 21, a radial channel structure 22 is arranged around the parallel micro-groove structure, and an annular micro-groove 23 is arranged between the parallel micro-groove structure and the radial channel structure. The heat-taking capacity of the substrate can be improved by utilizing the flow characteristics of working media in the channels of different areas; the parallel micro-groove structure is used as a boiling area, so that the number of vaporization cores of the phase change of the working medium can be increased, and the separation of bubbles from the solid wall surface is promoted; the radial channel structure is arranged around the parallel micro-groove structure, and the radial channel structure is used as a backflow area to be more favorable for the flowing of working media, so that the surrounding liquid working media are supplemented back to the central position where the boiling is most intense, the central position is prevented from being dried up, and the stable boiling operation of the heat dissipation device is ensured.
The confluence arc plate 5 is arranged in the phase change cavity, after the vapor working medium is condensed in the phase change cavity due to cooling, the confluence arc plate 5 collects the condensed liquid working medium and conveys the condensed liquid working medium to the combined micro-groove structure on the substrate 2, and the heat taking capacity and the working medium reflux capacity of the radiator can be improved. The shape of the confluence arc plate 5 is funnel-shaped, a plurality of rectangular steam passing holes 51 distributed in the circumferential direction are arranged on the conical surface of the confluence arc plate, so that the free passing of the thermal working medium can be ensured, and the high-efficiency transmission of the heat of the device is ensured. The lower end of the confluence arc plate 5 is provided with a flow outlet 52 which can send the liquid working medium collected by the confluence arc plate back to the designated position. The radial direction of the confluence arc plate is provided with a telescopic gap 53 with a central angle of 10-30 degrees. The bus arc plate is made of materials with certain elasticity, such as cold-rolled stainless steel, copper and the like; when the confluence arc plate is fixed at the preset position of the inner wall of the phase change cavity, the shape diameter of the confluence arc plate can be reduced by means of the space of the telescopic gap, and after the connecting ring 54 at the edge of the confluence arc plate is embedded into the connecting groove 112 on the side wall of the phase change cavity, the confluence arc plate can be fixed due to the recovery of the shape. The upper surface of the confluence arc plate adopts a super-hydrophobic surface, so that the attachment of a liquid working medium on the confluence arc plate can be reduced.
Examples 1 to 1
With the whole heat sinkSetting the total length as 300mm, width as 70mm and height as 59mm as an example; the heat source is an LED light source, the geometric side length B of the heat source is 38mm, the heat dissipation capacity of the light source is Q =47W, and the allowable temperature t of a welding spot of the cathode of the light source is c The temperature is 95 ℃, the characteristic temperature t is 70 ℃, the latent heat of phase change h =2333.8kJ/kg of the working medium, the surface tension coefficient sigma =0.06435N/m of the working medium, and the gravity acceleration g =9.81m/s 2 The working medium Plantt constant Pr =2.55, and the target heat transfer temperature difference delta t between the light source cathode welding spot and the phase change cavity is 5 ℃.
The production process of the radiating fins 12 is extrusion forming, the outer diameter D =0.07m of the phase change cavity 11 is provided with N =18 radiating fins, the length L of the radiating fins at the edge is 86mm, and the distance D is 6mm.
The working medium can adopt phase change liquid disclosed in 'a phase change liquid and a heat transmission module containing the phase change liquid' disclosed in Chinese patent gazette, and the patent number is CN 109307252A; the filling amount of the working medium is X:
wherein:
q is the heat generation of the LED light source, given by the light source supplier specification.
h is the latent heat of phase change of the working medium at the characteristic temperature, and t = t c -25，t c The allowable temperature for the solder joint of the cathode of the light source is given by the specification of the supplier of the light source.
Pr is working medium Prandtl constant at characteristic temperature, and t = t c -25，t c The temperature is allowed for the negative electrode solder joint of the light source.
And delta t is the target heat transfer temperature difference between the welding point of the cathode of the light source and the working medium in the phase change cavity, and is preset according to the design requirement of the heat dissipation device.
In order to ensure the optimal heat extraction performance of the combined micro-groove structure on the substrate 2, the optimal radius R of the phase change cavity is obtained by the following calculation:
area S of parallel micro-groove structure p Is 3cm 2 Depth h of parallel microgrooves p 700 μm, width W p 350 μm, period length 2W p =700 μm. Radial channel structure with channel depth h f 700 μm, minimum width W f And 350 μm. Depth h of annular micro-groove h 700 μm, width W h And 350 μm.
The height H of the phase change cavity is 48mm, and the height of the edge of the bus arc plate 5 in the phase change cavity is M =17mm.
Seven rectangular steam passing holes are formed in the conical surface of the confluence arc plate, and the size of the steam passing holes is 16mm and x 2mm; a 13-degree telescopic gap is formed on the confluence arc plate; the surface layer of the confluence arc plate is provided with a graphene coating and is processed into a super-hydrophobic surface; the diameter phi of the outflow hole 52 on the confluence arc plate 5 is calculated according to the following formula:
examples 1 to 2
Area S of parallel micro-groove structure p Is 2.2cm 2 Depth h of parallel microgrooves p 200 μm, width W p 100 μm, cycle length 2W p =200 μm. Radial channel structure with channel depth h f 200 μm, minimum width W f Is 100 μm. Depth h of annular micro-groove h 200 μm, width W h Is 100 μm. All other structures are the same as those of embodiment 1-1.
Examples 1 to 3
Area S of parallel micro-groove structure p Is 3.6cm 2 Depth h of parallel microgrooves p 2500 μm in width W p 1250 μm, a period length of 2W p =2500 μm. Radial channel structure with channel depth h f Is 2500 μm, minimum width W f 1250 μm. Depth h of annular micro-groove h 2250 μm and a width W h And 1350 μm. All other structures are the same as those of example 6-1.
Example 2
The substrate of this embodiment has a parallel micro-groove structure corresponding to the bottom of the phase change chamber, and the depth h of the parallel micro-groove p 2500 μm in width W p 1250 μm, a period length of 2W p =2500 μm, and all other structures are the same as in example 1-1.
Example 3
The substrate of this example is a smooth plane without a channel structure, and all other structures are the same as those of example 1-1.
Example 4-1
Seven rectangular steam passing holes are formed in the conical surface of the confluence arc plate, and the size of the steam passing holes is 11mm and x 2mm; the diameter of the outlet hole 52 on the confluence arc plate 5 is phi =0.0012m; all other structures are the same as those of embodiment 1-1.
Example 4 to 2
Seven rectangular steam passing holes are formed in the conical surface of the confluence arc plate, and the size of the steam passing holes is 21mm and x 4mm; the diameter of the outlet hole 52 on the confluence arc plate 5 is phi =0.0014m; all other structures are the same as those of embodiment 1-1.
Example 5
The diameter of the outlet of the bus-arc plate of this embodiment is phi =0.01m, and all other structures are the same as those of embodiment 1.
Example 6
The bus arc plate of the embodiment has no outlet, and all other structures are the same as those of the embodiment 1.
Example 7
The present embodiment has no bus-bar plate, and all other structures are the same as those of embodiment 1.
Example 8-1
In the embodiment, the radius of the phase change cavity is R =0.0336m, and seven rectangular steam passing holes are formed in the confluence arc plate, and the size of the steam passing holes is 18mm x 2mm; a 10-degree telescopic gap is formed on the confluence arc plate; 18 radiating fins are arranged on the outer side of the phase change cavity, the length of each radiating fin is 86mm, and the fin interval is 6.6mm. All other structures are the same as those of embodiment 1-1.
Example 8 to 2
In the embodiment, the radius of the phase change cavity is R =0.0284m, the outer diameter of the phase change cavity is D =0.0648m, and seven rectangular steam passing holes are formed in the confluence arc plate and have the size of 13mm x 2mm; a 14-degree telescopic gap is formed on the confluence arc plate; 16 fins are arranged on the outer side of the phase change cavity, the length of each fin is 86mm, and the interval between the fins is 6.4mm. All other structures are the same as those of example 5-1.
Examples 8 to 3
In the embodiment, the inner radius of the phase change cavity is R =0.024m, the outer diameter of the phase change cavity is D =0.056m, and seven rectangular steam passing holes with the size of 13mm × 2mm are formed in the confluence arc plate; a 14-degree telescopic gap is formed on the confluence arc plate; 14 fins are arranged on the outer side of the phase change cavity, the length of each fin is 86mm, and the interval between the fins is 6.4mm. All other structures are the same as those of example 5-1.
For the negative electrode welding spot temperature T of each light source of the embodiment c And continuously monitoring the temperature difference between the welding point of the cathode of the light source and the working medium for 24 hours, 48 hours and 72 hours respectively, and acquiring data as follows:
the results of the tests on the examples show that:
1) The existence of the confluence arc plate is beneficial to reducing the boiling heat transfer temperature difference, thereby reducing the temperature of a welding spot.
2) The size design of the flow-out opening of the confluence arc plate calculated according to a formula shows that the stability of delta t (the temperature difference between a welding point of a cathode of a light source and a working medium in a phase change cavity) tested in related embodiments is stronger.
3) Size of phase change chamber versus solder joint temperature T c The size design is obtained by calculating the inner radius of the phase change cavity according to a formula, and compared with the embodiment with the size being more than or equal to the size, T c Values comparable to DeltaT and better than less than this sizeExamples are given.
4) The middle part of the substrate adopts a combined micro-groove structure, and compared with a smooth substrate, the T-shaped substrate has a T-shaped structure c And better delta T stability.
In the present invention, each of the heat dissipating fins 12 is not limited to be arranged in parallel, but may be arranged radially, or may be arranged so as to be extended in a fan shape as shown in fig. 7. The heat dissipation main body can also be provided with a phase change inner container in the central through hole, and the confluence arc plate is arranged in a phase change cavity of the phase change inner container. The shape of the confluence arc plate is not limited to a conical funnel shape, and the confluence arc plate can also be a funnel shape with a plurality of frustum pyramid shapes. The working medium can also adopt other kinds of phase-change working media in the prior art; the heat source is not limited to the LED light source, but also can be the heat source of a high-performance computer, a high-power laser and high-power electronic equipment.
Claims (10)
1. A phase change heat taking device for enhancing working medium supplement capability of an evaporation section is characterized in that a heat dissipation main body (1) is provided with a phase change cavity, the phase change cavity is a vacuum cavity and is filled with working medium; the method is characterized in that: the upper surface of the phase change cavity bottom plate is provided with a combined micro-groove structure, and the heat source is arranged below the phase change cavity bottom plate; the middle part of the combined micro-groove structure is a parallel micro-groove structure (21), a radial channel structure (22) is arranged around the parallel micro-groove structure, and an annular micro-groove (23) is arranged between the parallel micro-groove structure and the radial channel structure.
2. The phase-change heat extraction device for enhancing working medium replenishing capacity of the evaporation section according to claim 1, characterized in that: the area of the parallel micro-groove structure is S p The heat source is square, the geometric side length is B, and S is more than or equal to 0.15 p /B 2 Less than or equal to 0.25; the depth of the parallel microgrooves in the structure is h p ，200μm≤h p Less than or equal to 2500 mu m, and the width of the parallel microgrooves is W p ，0.5≤W p /h p Less than or equal to 1, and the period length of the parallel microgrooves is 2W p 。
3. The phase-change heat extraction device for enhancing working medium replenishing capacity of the evaporation section according to claim 2, characterized in that: in the radial channel structure, a placing device is arrangedDepth of the radial channel is h f Minimum width of W f ，0.9≤h f /h p ≤1，1≤W f /W p ≤1.1。
4. The phase-change heat extraction device for enhancing working medium replenishing capacity of the evaporation section according to claim 3, characterized in that: the depth of the annular micro groove is h h ＝h f Width of W h ，0.9≤W h /W f ≤1.1。
5. The phase-change heat extraction device for enhancing working medium replenishing capacity of the evaporation section according to claim 1, characterized in that: a funnel-shaped confluence arc plate (5) is further fixedly arranged in the phase change cavity, the height of the edge of the confluence arc plate in the phase change cavity is M, M is more than 0.05H and less than or equal to 0.5H, and H is the height of the phase change cavity; the plate surface of the confluence arc plate is provided with a plurality of steam passing holes (51), and the lower end of the confluence arc plate is provided with a flow outlet (52).
6. The phase-change heat extraction device for enhancing working medium replenishing capacity of the evaporation section according to claim 1, characterized in that: the sum of the areas of all the steam passing holes is 5-20% of the area of the bottom surface of the phase change cavity.
7. The phase-change heat extraction device for enhancing working medium replenishing capacity of the evaporation section according to claim 5, characterized in that: and a telescopic gap (53) with a central angle of 10-30 degrees is radially arranged on the confluence arc plate.
8. The phase-change heat extraction device for enhancing working medium replenishing capacity of the evaporation section according to claim 5, characterized in that: the edge of the upper end of the confluence arc plate is provided with a connecting ring (54), and the connecting ring (54) is embedded in a connecting groove (112) in the circumferential direction of the side wall of the phase change cavity.
9. The phase-change heat extraction device for enhancing working medium replenishing capacity of the evaporation section according to claim 5, characterized in that: the upper surface of the confluence arc plate is a super-hydrophobic surface.
10. The phase-change heat extraction device for enhancing working medium replenishing capacity of the evaporation section according to claim 5, characterized in that: the lateral wall of the phase change cavity is provided with a vertical channel (111), and the vertical channel is parallel to the axis of the phase change cavity.
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