A heat sink mounting structure with segmented loading and fastening force

Abstract

This utility model belongs to the field of heat dissipation technology for electronic devices, specifically relating to a heat sink installation structure with segmented loading of fastening force, including screws, limiting members, and springs. By designing two opposing threads at the tail end of the screw, combined with corresponding stop designs, this utility model can precisely control the spring pressure during the two tightening processes of the screw, without requiring replacement of fastening tools or increasing the number of screw positions. This achieves safe and controllable segmented loading of the heat sink fastening force, avoiding edge chipping caused by excessive local instantaneous stress during installation.

Description

Technical Field

[0001] This utility model belongs to the field of heat dissipation technology for electronic devices, and specifically relates to a heat sink installation structure with segmented loading and fastening force. Background Technology

[0002] As an auxiliary heat dissipation structure installed on the chip surface, the heat sink is usually pressed onto the chip surface by a thermally conductive interface material to form an efficient heat conduction path. Its heat dissipation performance largely depends on the clamping force applied by the heat sink to the chip: sufficient clamping force can effectively reduce the contact thermal resistance between the heat sink and the chip and improve the overall heat dissipation performance.

[0003] As chip heat dissipation increases, on the one hand, heat sinks need to apply greater clamping force to the chip to reduce the contact thermal resistance between the heat sink and the chip; on the other hand, to reduce chip package thermal resistance, bare die chips without surface-mount packaging are widely used. However, after removing the surface-mount packaging, the bare die chip's ability to withstand the clamping force of the heat sink is significantly reduced. These two factors combined greatly increase the risk of chip chip chipping, microcracks, or even structural failure due to excessively high local instantaneous stress during heat sink installation.

[0004] In the actual assembly process, after the heat sink is placed on the chip surface, the screws are tightened in sequence. The spring is compressed and deformed, thereby applying the required locking force to the heat sink. When the limiting step surface at the lower end of the screw reaches the predetermined position, the spring compression reaches the set value and provides the rated downward force.

[0005] However, during the assembly process, if the first screw is tightened before the other screws are secured, directly tightening it to its final position will cause the heatsink to tilt or twist, resulting in excessive local stress on the chip edges in the area corresponding to that screw. This stress concentration can easily lead to brittle fracture of the bare die chip edges, producing defects such as... Figure 2 The chipping phenomenon shown here severely affects the mechanical integrity and reliability of the chip. Utility Model Content

[0006] The purpose of this invention is to provide a heat sink mounting structure with segmented loading and fastening force, which solves the technical problem in the prior art where the heat sink tilts and the chip suffers excessive local stress due to the direct tightening of screws, resulting in chip edge breakage and damage.

[0007] This utility model discloses a heat sink mounting structure with segmented loading and fastening force, including: A screw includes an end section, a smooth section, and a threaded section that are coaxially fixedly connected in sequence, wherein the diameter of the smooth section is larger than the diameter of the threaded section, so as to form a limiting step surface at the connection between the two. A limiting component is detachably and fixedly disposed at one end of the guide rod section near the screw section; A spring is sleeved on the outside of the smooth rod section and located between the end section and the limiting member; The screw segment includes a first thread at its end and a second thread in its middle, wherein the first thread and the second thread have opposite directions of rotation, and the major diameter of the first thread is smaller than the minor diameter of the second thread.

[0008] This application, by designing two opposing threads at the tail end of the screw and combining them with a corresponding stop design, can precisely control the spring pressure during the two tightening processes of the screw. It does not require changing the fastening tools or increasing the number of screw positions, and achieves safe and controllable segmented loading of the radiator fastening force, avoiding edge chipping caused by excessive local instantaneous stress during installation.

[0009] Based on the above technical solution, the solution of this application can be further improved as follows: Preferably, the limiting component is an open retaining ring, and a limiting ring groove is provided on the outer periphery of one end of the smooth rod section near the screw section, and the open retaining ring is engaged in the limiting ring groove; by adopting this solution, reliable fixing and precise positioning of the limiting component are achieved, and the open retaining ring structure is easy to assemble and disassemble, thereby improving disassembly efficiency and maintainability.

[0010] Preferably, the spring is a helical compression spring, and its natural length is greater than the distance between the end section and the limiting member; by adopting this solution, the screw has obtained a continuous elastic retaining force before installation, which effectively prevents it from loosening or falling off during handling or alignment, and improves the stability and efficiency of the assembly process.

[0011] Preferably, the end section, the smooth rod section, and the screw section are integrally formed. This solution enhances the overall structural strength and rigidity of the screw, avoids the loosening or stress concentration problems that may exist in a split design, ensures the coaxiality and dimensional accuracy between the sections, makes the spring force uniform, the fastening force loading more precise and reliable, and reduces the complexity of parts and assembly costs, thereby improving production efficiency and product consistency.

[0012] Preferably, the end face of the end section away from the polished rod section is provided with a joint groove; by adopting this solution, a standard and reliable force application interface is provided for the rotating tool, so that the screw can be screwed in efficiently and smoothly, ensuring the effective transmission of torque during the assembly process, and greatly improving the convenience of assembly and the reliability of operation.

[0013] Preferably, the engagement groove is an internal hexagonal hole; this solution provides a stable and reliable force application interface for standard wrenches, ensuring high torque transmission efficiency and ease of operation, effectively preventing tool slippage, and guaranteeing rotational accuracy and controllability.

[0014] Through the above technical solution, this utility model achieves the following beneficial effects: This application, by designing two opposing threads at the tail end of the screw and combining them with a corresponding stop design, can precisely control the spring pressure during the two tightening processes of the screw. It does not require changing the fastening tools or increasing the number of screw positions, and achieves safe and controllable segmented loading of the radiator fastening force, avoiding edge chipping caused by excessive local instantaneous stress during installation. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the heat sink mounting structure with segmented loading and fastening force as described in a specific embodiment of this application; Figure 2 This is a schematic diagram showing the state of a bare die chip when the corners are chipped. Figure 3 for Figure 1 The radiator mounting structure shown is a front sectional view before the first tightening, where the segmented loading and fastening force is applied. Figure 4 for Figure 1 The radiator mounting structure shown is a front sectional view after one locking, where the segmented loading and fastening force is applied. Figure 5 for Figure 1 The radiator mounting structure shown is a front sectional view after secondary locking, where the segmented loading and fastening force is applied. Explanation of reference numerals in the attached figures: 1. Screw; 101. Limiting step surface; 11. End section; 111. Engaging groove; 12. Polished rod section; 121. Limiting ring groove; 13. Screw section; 131. First thread; 132. Second thread; 2. Limiting component; 3. Spring; 4. Heat sink; 41. Side support plate; 411. Connecting hole; 5. Chip; 6. Thermal interface material; 7. Printed circuit board; 71. Through hole; 8. Mounting plate; 81. Second threaded hole; 9. Locking plate; 91. First threaded hole. Detailed Implementation

[0017] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0018] The terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as “first” or “second” may explicitly or implicitly include one or more of the stated features.

[0019] In this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0021] Example: like Figure 1 As shown in the figure, this application discloses a heat sink mounting structure with segmented loading of fastening force. Through the segmented locking mechanism, the fastening force is loaded in stages, thereby avoiding the problem of heat sink 4 tilting and chip 5 excessive local stress caused by the first screw 1 being locked in place at once. Its specific structure includes: screw 1, limiting member 2 and spring 3.

[0022] The screw 1 comprises an end section 11, a smooth section 12, and a screw section 13, which are coaxially fixedly connected in sequence. The diameter of the smooth section 12 is larger than the diameter of the screw section 13, forming a limiting step surface 101 at the connection between the two. Specifically, the end section 11 provides a screwdriver interface for applying rotational torque and also serves as a support surface for one end of the spring 3. The smooth surface of the smooth section 12 provides a smooth compression path for the spring 3, preventing the spring 3 from twisting or jamming during compression and ensuring that the downward pressure is vertical and uniform. The limiting step surface 101 is used to precisely limit the compression stroke of the spring 3, thereby providing constant and reliable downward pressure and avoiding the risk of damaging the chip 5 due to overtightening. The screw section 13 is used to convert the rotational motion of the screw 1 into linear motion and ultimately complete the locking.

[0023] The screw section 13 includes a first thread 131 at its end and a second thread 132 in its middle. The first thread 131 and the second thread 132 have opposite directions of rotation, and the major diameter of the first thread 131 is smaller than the minor diameter of the second thread 132.

[0024] Understandably, the first thread 131 and the second thread 132 have opposite directions of rotation, which achieves automatic stop during the first locking, thereby ensuring that the first stage of the locking force applied by each spring 3 is consistent, thus ensuring the accuracy and reliability of the locking force loading.

[0025] It is understandable that the major diameter of the first thread 131 is smaller than the minor diameter of the second thread 132, so that the first thread 131 can pass smoothly through the second threaded hole 81 that is adapted to the second thread 132 without causing motion interference. This is the core design for realizing segmented loading of the fastening force.

[0026] The limiting member 2 is detachably fixed at one end of the smooth rod section 12 near the screw section 13 to prevent the screw 1 from accidentally coming off the heat sink 4.

[0027] Spring 3 is sleeved outside the polished rod section 12 and located between the end section 11 and the limiting member 2 to provide continuous, elastic downward pressure.

[0028] This invention, by designing two opposing threads at the tail end of the screw 1 and combining them with a corresponding stop design, can precisely control the pressure of the spring 3 during the two tightening processes of the screw 1. It does not require changing the fastening tools or increasing the number of screw positions, and achieves safe and controllable segmented loading of the radiator 4's fastening force, avoiding edge chipping caused by excessive local instantaneous stress during installation.

[0029] In some embodiments, such as Figure 1 As shown, the limiting member 2 is an open retaining ring. The outer periphery of the end of the smooth rod section 12 near the screw section 13 is provided with a limiting ring groove 121, and the open retaining ring is engaged in the limiting ring groove 121.

[0030] Through the above design, reliable fixing and precise positioning of the limiting component 2 are achieved, and the open retaining ring structure facilitates assembly and disassembly, thereby improving maintainability and disassembly efficiency.

[0031] In some embodiments, such as Figure 1 As shown, spring 3 is a helical compression spring 3, and its natural length is greater than the distance between end section 11 and limit member 2.

[0032] The above design ensures that the spring 3 is in a compressed state during the pre-assembly stage, so that the screw 1 has a continuous elastic retaining force before installation, thereby effectively preventing it from loosening or falling off during handling or alignment. This improves the stability and efficiency of the assembly process and provides a reliable initial state for subsequent segmented loading.

[0033] In some embodiments, such as Figure 1 As shown, the end section 11, the smooth rod section 12, and the screw section 13 are integrally formed, which significantly enhances the overall structural strength and rigidity of the screw 1, avoids the loosening or stress concentration problems that may exist in the split design, and also ensures the coaxiality and dimensional accuracy between the sections, making the spring 3 subjected to force evenly, the fastening force loading more precise and reliable, and reducing the complexity of parts and assembly costs, thereby improving production efficiency and product consistency.

[0034] In some embodiments, such as Figure 1 As shown, the end face of the end section 11 away from the smooth rod section 12 is provided with a mating groove 111, which is used to provide a standard and reliable force application interface for rotating tools (such as screwdrivers or wrenches), enabling the screw 1 to be screwed in efficiently and smoothly, ensuring the effective transmission of torque during assembly, and greatly improving the convenience of assembly and the reliability of operation.

[0035] For example, the engagement groove 111 is an internal hexagonal hole, which provides a stable and reliable force application interface for the standard wrench, ensuring high torque transmission efficiency and ease of operation, effectively preventing tool slippage, and ensuring rotational accuracy and controllability; it can also be a cross groove, slotted groove, or Torx groove, etc., without specific limitation.

[0036] The workflow for this application will be further explained as follows: First, pre-assemble the installation structure: put the spring 3 on the smooth rod section 12 of the screw 1, then pass the screw 1 through the connecting hole 411 on the side support plate 41 of the radiator 4, and then detachably fix the limiting member 2 to one end of the smooth rod section 12 near the screw section 13.

[0037] It should be noted that since the natural length of spring 3 is greater than the distance between end section 11 and limiting member 2, spring 3 will be in a pre-compressed state, which will apply initial pressure to the side support plate 41 of radiator 4, thereby cooperating with limiting member 2 to fix the mounting structure axially on radiator 4. Since the connecting hole 411 is adapted to the smooth rod section 12, radial fixation is achieved. The two cooperate with each other to achieve stable installation of the mounting structure.

[0038] Secondly, perform a first-stage locking of the heat sink 4: place the heat sink 4 on the chip 5, and pre-place the thermal interface material 6 between them; at this time, as Figure 3As shown, the screw section 13 of each screw 1 will pass through the corresponding second threaded hole 81 on the mounting plate 8, and the lower end of the second thread 132 will just reach the entrance of the second threaded hole 81; then, using a fastening tool, screws 1 are screwed in one direction one by one, so that the second thread 132 and the second threaded hole 81 form a threaded connection, and the spring 3 is gradually compressed, thereby gradually applying the first stage of fastening force to the side support plate 41 of the radiator 4; when... Figure 4 As shown, when the lower end of the first thread 131 of the screw 1 reaches the inlet of the first threaded hole 91 on the locking plate 9, the screw 1 will stop screwing in because the threads rotate in opposite directions, and the second thread 132 will just rotate out of the second threaded hole 81 to avoid interference with the secondary locking; at this time, the first locking stop is achieved.

[0039] Finally, the radiator 4 is tightened a second time: after all screws 1 are tightened once, a fastening tool is used to continue screwing the screws 1 in the opposite direction, so that the first thread 131 and the first threaded hole 91 form a threaded engagement. The spring 3 is then gradually compressed a second time, thereby gradually applying a second stage of clamping force to the side support plate 41 of the radiator 4, until... Figure 5 As shown, the limiting step surface 101 at the end of the bare rod section 12 abuts against the mounting plate 8. At this time, the spring 3 reaches the designed compression amount and achieves secondary locking stop.

[0040] In particular, the second threaded hole 81 can also be designed at the through hole 71 on the printed circuit board 7, and after the second tightening, the limiting step surface 101 of the screw 1 is finally pressed onto the surface of the printed circuit board 7, so that the mounting plate 8 can be omitted, which is still within the design intent of this utility model.

[0041] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A radiator mounting structure with segmented loading and fastening force, characterized in that, include: A screw includes an end section, a smooth section, and a threaded section that are coaxially fixedly connected in sequence, wherein the diameter of the smooth section is larger than the diameter of the threaded section, so as to form a limiting step surface at the connection between the two. A limiting component is detachably and fixedly disposed at one end of the guide rod section near the screw section; A spring is sleeved on the outside of the smooth rod section and located between the end section and the limiting member; The screw segment includes a first thread at its end and a second thread in its middle, wherein the first thread and the second thread have opposite directions of rotation, and the major diameter of the first thread is smaller than the minor diameter of the second thread.

2. The radiator mounting structure with segmented loading and fastening force according to claim 1, characterized in that, The limiting component is an open retaining ring. A limiting ring groove is provided on the outer periphery of one end of the smooth rod section near the screw section, and the open retaining ring is engaged in the limiting ring groove.

3. The radiator mounting structure with segmented loading and fastening force according to claim 1, characterized in that, The spring is a helical compression spring, and its natural length is greater than the distance between the end section and the limiting member.

4. The radiator mounting structure with segmented loading and fastening force according to claim 1, characterized in that, The end section, the smooth rod section, and the screw section are integrally formed.

5. The radiator mounting structure with segmented loading and fastening force according to claim 1, characterized in that, The end face of the end section away from the optical rod section has a joint groove.

6. The radiator mounting structure with segmented loading and fastening force according to claim 5, characterized in that, The joint groove is an internal hexagonal hole.

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