Method for detecting a phase change heat spreader

Abstract

The application relates to the technical field of heat dissipation testing, and discloses a detection method for a phase change radiator, which comprises the following steps: arranging a first thermocouple at a position on a base at a first preset distance from a first end edge; arranging a second thermocouple at a position on the base at a second preset distance from a second end edge; arranging a third thermocouple on a heat dissipation side of a fin group close to a first end of the base; arranging a fourth thermocouple on a heat dissipation side of the fin group close to a second end of the base; starting an analog heat source; detecting a temperature value T1 of the first thermocouple, a temperature value T2 of the second thermocouple, a temperature value T3 of the third thermocouple and a temperature value T4 of the fourth thermocouple; and determining whether the phase change radiator is qualified according to the temperature value T1, the temperature value T2, the temperature value T3 and the temperature value T4. According to the temperature difference of different positions, whether the temperature uniformity performance of the phase change radiator is qualified can be determined, and the phase change radiator does not need to be mounted on a complete machine for online testing each time.

Description

Technical Field

[0001] This application relates to the field of heat dissipation testing technology, and for example to a testing method for phase change heat sinks. Background Technology

[0002] Air conditioning inverter heat dissipation modules typically employ air cooling and refrigerant loop cooling. The heat sinks are usually aluminum profiles. However, conventional aluminum profile heat sinks, when transferring heat through the aluminum plate, have poor temperature uniformity, making it difficult to guarantee the heat dissipation efficiency of the distributed chips and failing to meet the heat dissipation requirements of air conditioning inverter modules under higher heat loads. Phase change heat sinks can solve the heat dissipation problem of the heat source in air conditioning inverter modules. They rely on the phase change heat transfer of the internal working fluid, possessing extremely high thermal conductivity. The temperature uniformity performance of phase change heat sinks is a crucial indicator for evaluating their quality and heat dissipation effect.

[0003] Current methods for evaluating heat sinks require installation and online testing on the entire system, and each heat sink needs to be installed and tested on the entire system. This testing method is complex, time-consuming, difficult to operate, and prone to errors. Summary of the Invention

[0004] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0005] This disclosure provides a testing method for phase change heat sinks to solve the problem that existing phase change heat sinks require online testing on a complete machine to determine whether they are qualified.

[0006] In some embodiments, the detection method for a phase change heat sink includes: a base, a heat dissipation pipe thermally connected to the base, the heat dissipation pipe including at least one S-shaped pipe segment structure, and a fin assembly thermally connected to the base, with a receiving groove formed on the surface in contact with the base for mounting the heat dissipation pipe; a simulated heat source is provided at the end of the base, the method comprising:

[0007] A first thermocouple is arranged on the base at a first predetermined distance from the first end edge;

[0008] A second thermocouple is arranged on the base at a second predetermined distance from the second end edge;

[0009] A third thermocouple is arranged on the heat dissipation side of the first end of the fin assembly near the base;

[0010] A fourth thermocouple is arranged on the heat dissipation side of the second end of the fin assembly near the base;

[0011] The simulated heat source is activated, and the temperature values ​​of the first thermocouple T1, the second thermocouple T2, the third thermocouple T3, and the fourth thermocouple T4 are detected.

[0012] Based on the temperature values ​​T1, T2, T3, and T4, determine whether the phase change radiator is qualified.

[0013] In some embodiments, determining whether the phase change heat sink is qualified based on the temperature value T1, the temperature value T2, the temperature value T3, and the temperature value T4 includes:

[0014] If |T1-T2|≤first preset temperature value, |T1-T3|≤second preset temperature value, |T2-T4|≤third preset temperature value, and |T3-T4|≤fourth preset temperature value, then the phase change radiator is qualified.

[0015] In some embodiments, determining whether the phase change heat sink is qualified based on the temperature value T1, the temperature value T2, the temperature value T3, and the temperature value T4 further includes:

[0016] If |T1-T2|>the first preset temperature value, then the base is thermally connected to the heat dissipation pipe, and / or the heat dissipation pipe is defective.

[0017] In some embodiments, a fifth thermocouple is arranged at a first end of the heat dissipation pipe near the base, and a sixth thermocouple is arranged at a second end of the heat dissipation pipe near the base, and the temperature values ​​T5 of the fifth thermocouple and T6 of the sixth thermocouple are detected; the method further includes:

[0018] If |T1-T2| > the first preset temperature value, and |T5-T6| ≤ the fifth preset temperature value, then the heat dissipation pipe is qualified, and the thermal connection between the base and the heat dissipation pipe is unqualified; if |T5-T6| > the fifth preset temperature value, then the heat dissipation pipe is unqualified.

[0019] In some embodiments, determining whether the phase change heat sink is qualified based on the temperature value T1, the temperature value T2, the temperature value T3, and the temperature value T4 further includes:

[0020] If |T3-T4| > the fourth preset temperature value, then the base is thermally connected to the heat dissipation pipe and the fins, and / or the heat dissipation pipe is defective.

[0021] In some embodiments, the method further includes:

[0022] If |T3-T4| > the fourth preset temperature value, and |T1-T2| ≤ the first preset temperature value, then the thermal connection between the base and the heat dissipation pipe and the heat dissipation pipe are qualified, while the thermal connection between the base and the fin assembly is unqualified.

[0023] In some embodiments, determining whether the phase change heat sink is qualified based on the temperature value T1, the temperature value T2, the temperature value T3, and the temperature value T4 further includes:

[0024] If |T1-T3| > the second preset temperature value, and / or |T2-T4| > the third preset temperature value, then the connection between each pair of the base, the heat dissipation pipe and the fin assembly, the thermally conductive material, and / or the thickness of the base are unqualified.

[0025] In some embodiments, the first preset distance is ≤20mm, and / or the second preset distance is ≤20mm.

[0026] In some embodiments, the simulated heat source is a square simulated heat source;

[0027] When the simulated heat source is located at the first end of the base, the distance between the simulated heat source and the first thermocouple is less than or equal to 5 mm; or, when the simulated heat source is located at the second end of the base, the distance between the simulated heat source and the second thermocouple is less than or equal to 5 mm.

[0028] In some embodiments, prior to "starting the simulated heat source", the method further includes:

[0029] Under normal temperature and natural convection conditions, the base and heat dissipation pipe are placed horizontally and maintained for a first set time to ensure that the working fluid in the heat dissipation pipe is evenly distributed horizontally.

[0030] The testing method for phase change heat sinks provided in this disclosure can achieve the following technical effects: by arranging a first thermocouple, a second thermocouple, a third thermocouple, and a fourth thermocouple at designated locations on the phase change heat sink, and collecting the temperature value at each designated location, the method can determine whether the temperature uniformity performance of the phase change heat sink is qualified based on the temperature difference at different locations when the temperature uniformity performance is unqualified. This reduces the difficulty for testers to troubleshoot problems. Furthermore, it eliminates the need to install the phase change heat sink on the entire machine for online testing each time, instead conducting simulation tests. The testing method is simple, time-saving, and the thermocouple placement is easy and easy to operate.

[0031] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0032] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0033] Figure 1 This is a schematic diagram of the structure of the phase change heat sink provided in the embodiments of this disclosure;

[0034] Figure 2 Thermocouple arrangement of the phase change radiator provided in the embodiments of this disclosure. Figure 1 ;

[0035] Figure 3 Thermocouple arrangement of the phase change radiator provided in the embodiments of this disclosure. Figure 2 ;

[0036] Figure 4 This is a flowchart of a detection method for a phase change heat sink provided in an embodiment of this disclosure.

[0037] Figure label:

[0038] 10: Base; 20: Heat sink; 30: Fin assembly; 40: Simulated heat source; 50: First thermocouple; 60: Second thermocouple; 70: Third thermocouple; 80: Fourth thermocouple; 90: Fifth thermocouple; 100: Sixth thermocouple. Detailed Implementation

[0039] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0040] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0041] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0042] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0043] Unless otherwise stated, the term "multiple" means two or more.

[0044] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0045] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0047] Combination Figures 1 to 4 As shown, this disclosure provides a testing method for a phase change heat sink, including a phase change heat sink comprising: a base 10, a heat dissipation pipe 20 thermally connected to the base 10, the heat dissipation pipe 20 including at least one S-shaped pipe segment structure, and a fin assembly 30 thermally connected to the base 10, and having a receiving groove constructed on the surface in contact with the base 10 for mounting the heat dissipation pipe 20.

[0048] In this embodiment of the phase change radiator, the base 10 is thermally connected to multiple frequency converter modules, which are distributed in a dispersed manner. The S-shaped tube structure of the heat dissipation pipe 20 corresponds to the multiple frequency converter modules, connecting them in series. This allows the heat generated by the frequency converter modules to be directly transferred to the heat dissipation pipe 20 through the base 10. Alternatively, heat generated by a high-heat-generating frequency converter module can be transferred to the heat dissipation pipe 20 via the base 10 and then rapidly dissipated outwards through the heat dissipation pipe 20, reaching the low-temperature region of the base 10, thus achieving temperature homogenization between the base 10 and the heat dissipation pipe 20. The heat is then transferred through the base 10 and the heat dissipation pipe 20 to the fin assembly 30 for cooling. The heat dissipation pipe 20 is located within the receiving groove, which not only expands the heat transfer area between the heat dissipation pipe 20 and the fin assembly 30 but also allows the heat from the base 10 to be directly transferred to the fin assembly 30, improving the overall heat dissipation efficiency of the radiator.

[0049] The technical conditions for testing the phase change heat sink of this embodiment may include:

[0050] 1. The atmospheric conditions of the test environment shall comply with the requirements of the normal test atmospheric pressure in GB / T2421.

[0051] 2. Temperature measurement should be performed under the maximum heat dissipation operating condition of the equipment (simulated heat source 40).

[0052] 3. When measuring the surface temperature of charged components and the temperature of the surrounding air, the measuring sensor (thermocouple) should be ensured to have sufficient electrical insulation performance.

[0053] 4. The arrangement of thermocouples should not have a significant impact on the temperature field of the equipment or components being measured.

[0054] 5. In this embodiment, a T-type thermocouple is preferred, and a copper-copper-nickel thermocouple is used. The measured temperature range is from -200°C to 350°C. The advantages of this type of thermocouple are: good linearity, large thermodynamic potential, high sensitivity, near-linear temperature measurement and good reproducibility, fast heat transfer, good stability and temperature uniformity, and low cost. Of course, other thermocouples that can achieve temperature measurement and meet the above requirements can also be selected. The specific selection of thermocouples does not constitute a limitation of this application and should be limited to the scope of protection of this application.

[0055] Combination Figures 1 to 4 As shown, in this embodiment, a simulated heat source 40 is provided at the end of the base 10, and the detection method for the phase change heat sink includes:

[0056] S10: A first thermocouple 50 is arranged on the base 10 at a position at a first preset distance from the first end edge;

[0057] S20: A second thermocouple 60 is installed on the base 10 at a second preset distance from the second end edge;

[0058] S30: A third thermocouple 70 is installed on the heat dissipation side of the fin assembly 30 near the first end of the base 10.

[0059] S40: A fourth thermocouple 80 is installed on the heat dissipation side of the second end of the fin assembly 30 near the base 10;

[0060] S50: Start the simulated heat source 40 and detect the temperature values ​​T1 of the first thermocouple 50, T2 of the second thermocouple 60, T3 of the third thermocouple 70, and T4 of the fourth thermocouple 80.

[0061] S60: Determine whether the phase change radiator is qualified based on temperature values ​​T1, T2, T3, and T4.

[0062] The detection method provided in this embodiment of the present disclosure involves arranging a first thermocouple 50, a second thermocouple 60, a third thermocouple 70, and a fourth thermocouple 80 at designated locations on the phase change heat sink. Temperature values ​​are collected at each designated location. Based on the temperature difference at different locations, it is possible not only to determine whether the temperature uniformity performance of the phase change heat sink is up to standard, but also to distinguish the specific reasons for the failure when the temperature uniformity performance is not up to standard. This reduces the difficulty for testers to troubleshoot problems. Furthermore, it eliminates the need to install the phase change heat sink on the entire machine for online testing each time; instead, it allows for simulation testing. The testing method is simple, time-saving, and the thermocouple placement is easy and easy to operate.

[0063] The base 10 has a plate-like structure. Optionally, the base 10 is stepped, including a higher step and a lower step. In practical use, the frequency converter module is located in the higher step of the base 10, and the thickness of the higher step is greater than that of the lower step, thereby improving the heat storage capacity of the base 10. Therefore, the simulated heat source 40 simulates the frequency converter module, and the simulated heat source 40 is preferably located in the higher step of the base 10.

[0064] Optionally, the upper part of the base 10 is divided into three parallel regions along the length of the base 10. The simulated heat source 40 is located in one of the two regions at both ends of the base 10. In this way, during measurement, it helps to detect whether heat can be transferred from one end of the heat dissipation pipe 20 and the base 10 to the other end within a preset time, thereby verifying whether the temperature uniformity performance of the heat sink is qualified.

[0065] Optionally, the simulated heat source 40 is a ceramic heating element with dimensions of 30mm × 30mm × 2mm. Silicone grease can be applied between the simulated heat source 40 and the base 10 to reduce contact thermal resistance. During testing, the input power of the simulated heat source 40 is set according to the maximum heat output of the air conditioner during operation.

[0066] In practical applications, those skilled in the art can flexibly set the shape and size of the simulated heat source 40. However, the projection of the simulated heat source 40 onto the base 10 should be completely within the base 10 to ensure the subsequent thermocouple arrangement requirements.

[0067] In this embodiment, the phrase "arranging the first thermocouple 50 at a first preset distance from the first end edge on the base 10" takes a rectangular base 10 as an example. The first end is the end of the base 10 along its length, and the first preset distance can be 20mm. It is crucial to ensure that the first thermocouple 50 does not interfere with the simulated heat source 40 to prevent affecting the detection accuracy of the first thermocouple 50. If interference does occur, the first thermocouple 50 can be placed to the left or right of the simulated heat source 40, with the first preset distance less than 20mm. Alternatively, the first thermocouple 50 can be placed above or below the simulated heat source 40 (horizontally positioned).

[0068] In this embodiment, "arranging the second thermocouple 60 at a second preset distance from the edge of the second end on the base 10" is taken as an example where the base 10 is rectangular. The second end is the end of the base 10 along its length and is positioned opposite to the first end. The second preset distance can be 20mm. It is crucial to ensure that the second thermocouple 60 does not interfere with the simulated heat source 40 to prevent affecting the detection accuracy of the second thermocouple 60. If interference does occur, the second thermocouple 60 can be positioned to the left or right of the simulated heat source 40, with the second preset distance less than 20mm. Alternatively, the second thermocouple 60 can be positioned above or below the simulated heat source 40 (which is horizontally positioned).

[0069] In the above description, the simulated heat source 40 is located near at least one thermocouple, which could be either the first thermocouple 50 or the second thermocouple 60. The specific location of the simulated heat source 40 can be determined based on the actual testing conditions.

[0070] In this embodiment, the side of the fin assembly 30 that is in contact with the base 10 is the heat-conducting surface, which is also the heat-conducting side of the fin assembly 30, while the other side opposite to the heat-conducting side is the heat-dissipating side.

[0071] In this embodiment, "a third thermocouple 70 is arranged on the heat dissipation side of the fin assembly 30 near the first end of the base 10" can be understood as follows: along the length of the base 10, the third thermocouple 70 and the first thermocouple 50 are located on the same side of the base 10, and the third thermocouple 70 is arranged corresponding to the first thermocouple 50. In this embodiment, the temperature detected by the third thermocouple 70 reflects the temperature of the heat sink on the heat dissipation side.

[0072] In this embodiment, "a fourth thermocouple 80 is arranged on the heat dissipation side of the fin assembly 30 near the second end of the base 10" can be understood as follows: along the length of the base 10, the fourth thermocouple 80 and the second thermocouple 60 are located on the same side of the base 10, and the fourth thermocouple 80 is arranged corresponding to the second thermocouple 60. In this embodiment, the temperature detected by the fourth thermocouple 80 reflects the temperature of the heat sink on the heat dissipation side.

[0073] It should be noted that the arrangement order of the first thermocouple 50, the second thermocouple 60, the third thermocouple 70, and the fourth thermocouple 80 in the above-mentioned steps can be adjusted, that is, the execution order of S10, S20, S30, and S40 can be flexibly adjusted. This is as long as the first thermocouple 50, the second thermocouple 60, the third thermocouple 70, and the fourth thermocouple 80 can be arranged in their designated positions.

[0074] In this embodiment, S50: Start the simulated heat source 40 and detect the temperature values ​​T1 of the first thermocouple 50, T2 of the second thermocouple 60, T3 of the third thermocouple 70 and T4 of the fourth thermocouple 80.

[0075] Optionally, before “starting the simulated heat source 40”, the following steps may also be included: under normal temperature natural convection conditions, the base 10 and the heat dissipation pipe 20 are placed horizontally and kept for a first set time so that the working fluid in the heat dissipation pipe 20 is evenly distributed horizontally.

[0076] This method ensures that the working fluid inside the heat pipe of the phase change radiator is evenly distributed within the heat pipe, allowing for subsequent thermocouple placement and temperature detection. Those skilled in the art can flexibly set the specific first set time in practical applications; for example, the first set time can be set to 15 seconds.

[0077] S60: Determine whether the phase change radiator is qualified based on temperature values ​​T1, T2, T3, and T4.

[0078] Optionally, step S60 above specifically includes: if |T1-T2|≤first preset temperature value, |T1-T3|≤second preset temperature value, |T2-T4|≤third preset temperature value, and |T3-T4|≤fourth preset temperature value, then the phase change radiator is qualified.

[0079] That is, when all four conditions are met simultaneously—|T1-T2|≤ first preset temperature value, |T1-T3|≤ second preset temperature value, |T2-T4|≤ third preset temperature value, and |T3-T4|≤ fourth preset temperature value—the phase change radiator is qualified, and its temperature uniformity performance is also qualified. Those skilled in the art can flexibly set the first, second, third, and fourth preset temperature values ​​according to the specific circumstances in practical applications. For example, the first preset temperature value could be 3℃, the second preset temperature value 8℃, the third preset temperature value 8℃, and the fourth preset temperature value 3℃.

[0080] Optionally, step S60 above further includes: if |T1-T2|> first preset temperature value, then the base 10 is thermally connected to the heat sink 20, and / or the heat sink 20 is unqualified.

[0081] The failure to achieve a satisfactory thermal connection between the base 10 and the heat sink 20 can be attributed to several factors, including the connection method between the base 10 and the heat sink 20, the thermal conductivity of the interface material, the material of the base 10, and / or the thickness of the base 10. For example, with a first preset temperature of 3℃, when |T1-T2| > 3℃, the failure can be attributed to several factors, including the connection method between the base 10 and the heat sink 20 (e.g., thermally conductive silicone, thermally conductive grease + thermally conductive silicone, bolt / screw / rivet + thermally conductive grease, or welding), the thermal conductivity of the interface material, the material of the base 10 (e.g., the thermal conductivity differs between 3003 and 6063 aluminum), and the thickness of the base 10 (greater thickness results in a greater temperature difference).

[0082] In addition, heat pipe 20 is defective, meaning that the heat received at the section of heat pipe 20 corresponding to the simulated heat source 40 cannot be transferred to the entire heat pipe 20 within the specified time. This can be understood as poor temperature uniformity of heat pipe 20, thus rendering heat pipe 20 defective.

[0083] Optionally, step S60 above further includes: installing a fifth thermocouple 90 at a position near the first end of the heat dissipation pipe 20 close to the base 10; installing a sixth thermocouple 100 at a position near the second end of the heat dissipation pipe 20 close to the base 10; and detecting the temperature value T5 of the fifth thermocouple 90 and the temperature value T6 of the sixth thermocouple 100.

[0084] With the base 10, heat dissipation pipe 20, and fin assembly 30 assembled and connected, a portion of the heat dissipation pipe 20 is visible through the side of the radiator, i.e., exposed in the line of sight. Therefore, a fifth thermocouple 90 is installed at the first end of the heat dissipation pipe 20 near the base 10; that is, the fifth thermocouple 90 is installed on the exposed section of the heat dissipation pipe 20 near the first end of the base 10 for installation. Similarly, a sixth thermocouple 100 is installed at the second end of the heat dissipation pipe 20 near the base 10. The temperature values ​​of the fifth thermocouple 90 and the sixth thermocouple 100 reflect the temperature values ​​at opposite ends of the heat dissipation pipe 20. The temperature difference between the fifth thermocouple 90 and the sixth thermocouple 100 reflects the temperature difference between the two ends of the heat dissipation pipe 20.

[0085] The testing method for phase change heat sinks also includes: if |T1-T2|>the first preset temperature value, and |T5-T6|≤the fifth preset temperature value, then the heat sink 20 is qualified, and the thermal connection between the base 10 and the heat sink 20 is unqualified; if |T5-T6|>the fifth preset temperature value, then the heat sink 20 is unqualified.

[0086] The condition |T5-T6|≤the fifth preset temperature value can be understood as the temperature difference between the two ends of the heat sink 20 meeting the condition, i.e., the heat sink 20 is qualified and its temperature uniformity performance is qualified. When the simulated heat source 40 is located at one end of the base 10, the heat generated by it is transferred through the base 10 to one end of the heat sink 20 at the corresponding position. Then, the heat is quickly transferred through the heat sink 20 to the other end and to the base 10 and the fin assembly 30.

[0087] When heat is transferred to the other end of the heat sink 20 and the base 10, if |T1-T2| ≤ the first preset temperature value, then the thermal connection between the base 10 and the heat sink 20 is qualified, meaning that the heat from the heat sink 20 can be transferred to the base 10 within the set time. If |T1-T2| > the first preset temperature value, then the thermal connection between the base 10 and the heat sink 20 is unqualified, meaning that the heat from the heat sink 20 cannot be transferred to the base 10 within the set time, resulting in a decrease in the temperature uniformity of the base 10. The factors contributing to the unqualified thermal connection between the base 10 and the heat sink 20 can be referred to the above description and will not be repeated here.

[0088] Furthermore, if |T1-T2| > the first preset temperature value, and |T5-T6| > the fifth preset temperature value, then the heat sink 20 is defective. That is, the heat sink 20 is defective and cannot quickly transfer heat from one end to the other end within the set time.

[0089] This embodiment, by considering the relationship between |T5-T6| and the fifth preset temperature value when |T1-T2| > the first preset temperature value, can narrow down the range of reasons for non-compliance between the base 10 and the heat dissipation pipe 20, and more quickly determine the specific reasons for non-compliance.

[0090] Optionally, determining whether the phase change heat sink is qualified based on temperature values ​​T1, T2, T3, and T4 further includes: if |T3-T4|> the fourth preset temperature value, then the base 10 is thermally connected to the heat sink 20 and the fins, and / or the heat sink 20 is unqualified.

[0091] |T3-T4|>The fourth preset temperature value indicates that the temperature difference on the heat dissipation side of the phase change radiator does not meet the requirements. Therefore, the thermal conductivity connection between the base 10 and the heat dissipation pipe 20 and the fin assembly 30 is deemed unqualified, and / or the heat dissipation pipe 20 is deemed unqualified. For example, the thermal conductivity connection between the base 10 and the heat dissipation pipe 20, between the base 10 and the fin assembly 30, and between the heat dissipation pipe 20 and the fin assembly 30 may be unqualified. It is also possible that the heat dissipation pipe 20 is unqualified. The unqualified factors for the heat dissipation pipe 20 can be investigated from three aspects: sealing performance, the amount of working fluid injected, and whether the pipeline is unobstructed.

[0092] The thermally conductive connections between the base 10 and the heat sink 20, the base 10 and the fin assembly 30, and the heat sink 20 and the fin assembly 30 are substandard. The reasons for the substandard connections can be identified by examining the connection method, the thermal conductivity of the interface material, the material itself, and its thickness. Connection methods include, but are not limited to, thermally conductive silicone, thermally conductive grease + thermally conductive silicone, bolts / screws / rivets + thermally conductive grease, or welding.

[0093] Optionally, the testing method for the phase change heat sink further includes: if |T3-T4|>the fourth preset temperature value, and |T1-T2|≤the first preset temperature value, then the thermal connection between the base 10 and the heat sink 20 and the heat sink 20 are qualified, while the thermal connection between the base 10 and the fin assembly 30 is unqualified.

[0094] When |T3-T4| > the fourth preset temperature value, and |T1-T2| ≤ the first preset temperature value, the thermal conductivity connection problem between the base 10 and the heat sink 20, as well as the problem with the heat sink 20 itself, can be ruled out. This narrows down the cause of the phase change heat sink's failure to a faulty thermal conductivity connection between the base 10 and the fin assembly 30. This shortens the time spent finding the cause of the failure and allows for a more effective and targeted solution to the problem causing the thermal conductivity connection issue between the base 10 and the fin assembly 30.

[0095] Optionally, determining whether the phase change heat sink is qualified based on temperature values ​​T1, T2, T3, and T4 further includes: if |T1-T3|> a second preset temperature value, and / or |T2-T4|> a third preset temperature value, then the connection between each pair of the base 10, the heat dissipation pipe 20, and the fin assembly 30, the thermally conductive material, and / or the thickness of the base 10 are unqualified.

[0096] By using |T1-T3| > the second preset temperature value, and / or |T2-T4| > the third preset temperature value, it is determined that the connections between any two of the base 10, the heat dissipation pipe 20, and the fin assembly 30, the thermally conductive materials, and / or the thickness of the base 10 are unqualified. Specifically, the first thermocouple 50 and the third thermocouple 70 are relatively side-mounted, i.e., both close to the first end of the base 10. The second thermocouple 60 and the fourth thermocouple 80 are also side-mounted, i.e., both close to the second end of the base 10. The temperature difference obtained from thermocouples positioned on the same side provides greater accuracy and comparative analysis.

[0097] In this embodiment, the ambient temperature T0 can be detected before all thermocouples are deployed. After all thermocouples are deployed and their respective temperature values ​​are detected, |T0-T1|, |T0-T2|, |T0-T3|, |T0-T4|, |T0-T5|, and |T0-T6| are calculated and compared with a sixth preset temperature value. If they are less than the sixth preset temperature value, it indicates that there is a problem with the deployment of the corresponding thermocouple. For example, the sixth preset temperature value is 1℃. When |T0-T1| < 1℃, it is determined that the data detected by the first thermocouple 50 is inaccurate, and the first thermocouple 50 may have fallen off or been improperly deployed. The same logic applies to the second thermocouple 60, the third thermocouple 70, the fourth thermocouple 80, the fifth thermocouple 90, and the sixth thermocouple 100, which will not be elaborated further here. When there is a problem with the placement of a thermocouple, the thermocouple can be rearranged, and then the temperature value corresponding to the thermocouple can be measured. Only when the absolute value of the difference between the temperature value and the ambient temperature is ≥1℃ can it be said that the thermocouple placement is not the problem.

[0098] Optionally, the first preset distance is ≤20mm, and / or the second preset distance is ≤20mm.

[0099] By setting a first preset distance ≤ 20mm and a second preset distance ≤ 20mm, that is, the distance from the first thermocouple 50 to the edge of the first end of the base 10 is less than 20mm, and the distance from the second thermocouple 60 to the edge of the second end of the base 10 is less than 20mm, the spacing between the first thermocouple 50 and the second thermocouple 60 is matched as closely as possible to the length of the base 10. This ensures that the temperature difference between the first thermocouple 50 and the second thermocouple 60 fully reflects the temperature uniformity of the base 10, improving the accuracy of temperature uniformity detection. In this embodiment, the length of the base 10 is generally 175mm. The distance between the first thermocouple 50 and the second thermocouple 60 ranges from 130mm to 170mm.

[0100] Optionally, the simulated heat source 40 is a square simulated heat source 40; when the simulated heat source 40 is located at the first end of the base 10, the distance between the simulated heat source 40 and the first thermocouple 50 is less than or equal to 5 mm, or when the simulated heat source 40 is located at the second end of the base 10, the distance between the simulated heat source 40 and the second thermocouple 60 is less than or equal to 5 mm.

[0101] When the simulated heat source 40 is located at the first end of the base 10, the distance between the simulated heat source 40 and the first thermocouple 50 is less than or equal to 5 mm. This avoids interference between the simulated heat source 40 and the first thermocouple 50 during installation. Furthermore, having both located at the first end of the base 10 brings the first thermocouple 50 as close as possible to the simulated heat source 40, making the temperature of the first thermocouple 50 similar to that of the simulated heat source 40, thus improving the accuracy and precision of the temperature detected by the first thermocouple 50. Similarly, when the simulated heat source 40 is located at the second end of the base 10, the distance between the simulated heat source 40 and the second thermocouple 60 is less than or equal to 5 mm. This helps improve the accuracy and precision of the temperature detected by the second thermocouple 60, thereby improving the accuracy of the phase change radiator test data and the overall accuracy of the test results.

[0102] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method for detecting a phase change heat spreader, the phase change heat spreader comprising: The base, the heat pipe, and the fin group are in thermal contact with the base, and the surface of the fin group in contact with the base is provided with a receiving groove for mounting the heat pipe; characterized in that a simulated heat source is arranged at the end of the base, and the method comprises: A first thermocouple is arranged on the base at a first preset distance from the first end edge; A second thermocouple is arranged on the base at a second preset distance from the second end edge; A third thermocouple is arranged on the heat dissipation side of the fin group close to the first end of the base, corresponding to the first thermocouple; A fourth thermocouple is arranged on the heat dissipation side of the fin group close to the second end of the base, corresponding to the second thermocouple; The simulated heat source is started, and the temperature values T1, T2, T3, and T4 of the first, second, third, and fourth thermocouples are detected; According to the temperature values T1, T2, T3, and T4, it is determined whether the phase change heat sink is qualified; If |T1-T2|≤ the first preset temperature value, |T1-T3|≤ the second preset temperature value, |T2-T4|≤ the third preset temperature value, and |T3-T4|≤ the fourth preset temperature value, the phase change heat sink is qualified; If |T1-T2|> the first preset temperature value, the base and the heat pipe are in thermal contact, and / or the heat pipe is unqualified; If |T3-T4|> the fourth preset temperature value, the base and the heat pipe and the fin group are in thermal contact, and / or the heat pipe is unqualified; If |T1-T3|> the second preset temperature value and / or |T2-T4|> the third preset temperature value, the connection between the base, the heat pipe, and the fin group, the thermal conductive material, and / or the thickness of the base are unqualified. A fifth thermocouple is arranged on the heat pipe close to the first end of the base, and a sixth thermocouple is arranged on the heat pipe close to the second end of the base, and the temperature values T5 and T6 of the fifth and sixth thermocouples are detected; if |T1-T2|> the first preset temperature value, the base and the heat pipe are in thermal contact, and / or the heat pipe is unqualified, which further comprises:

2. The method of claim 1, wherein, If |T5-T6|≤ the fifth preset temperature value, the heat pipe is qualified, and the thermal connection between the base and the heat pipe is unqualified; if |T5-T6|> the fifth preset temperature value, the heat pipe is unqualified. If |T3-T4|> the fourth preset temperature value, the base and the heat pipe and the fin group are in thermal contact, and / or the heat pipe is unqualified, which further comprises:

3. The method of claim 1, wherein, ​ In case that |T3-T4|> fourth preset temperature value, if |T1-T2|≤ first preset temperature value, the heat conduction connection between the base and the heat pipe is qualified, the heat pipe is qualified, and the heat conduction connection between the base and the fin group is unqualified.

4. The method of claim 1, wherein the first preset distance is ≤ 20 mm, and / or the second preset distance is ≤ 20 mm. The simulation heat source is a square simulation heat source.

5. The method of claim 1, wherein, In case that the simulation heat source is arranged at the first end of the base, the distance between the simulation heat source and the first thermocouple is less than or equal to 5 mm, or in case that the simulation heat source is arranged at the second end of the base, the distance between the simulation heat source and the second thermocouple is less than or equal to 5 mm. Before the step of "starting the simulation heat source", the method further comprises:

6. The method according to any one of claims 1 to 5, characterized in that, Under the condition of normal temperature natural convection, the base and the heat pipe are horizontally placed and kept for a first set time, so that the working medium in the heat pipe is horizontally and evenly distributed. ​

Images