Screw, connecting assembly and circuit module

Abstract

The utility model provides a screw, a connecting assembly and a circuit module. The screw comprises a stopping part, a first straight rod part and a second straight rod part which are sequentially connected in the first direction. The second straight rod part comprises a first section and a second section connected with the first section, the projection of the second section in the first direction falls into the projection of the first section in the first direction, external threads are arranged on the outer circumferential surface of the first section, and the second section is far away from the first straight rod part compared with the first section. The length of the second straight rod part in the first direction is larger than or equal to the length of a nut in threaded connection with the screw through the external thread in the first direction. The screw and the nut have specific relative positions, so that in the assembling process of the circuit board and the radiator, the installation position of the screw can be visually judged, the poor installation phenomenon that the screw is not locked to the limited position is effectively avoided, and the assembling reliability is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of chip manufacturing, and in particular to a screw, a connection assembly, and a circuit module. Background Art

[0002] Currently, multiple chips can be placed on a single server hashboard (or circuit board) to increase overall computing power. The simultaneous operation of multiple chips increases overall system power consumption. To ensure stable system operation, a single heat sink with better temperature uniformity and lower cost is generally used to dissipate heat from multiple chips.

[0003] When designing the overall heat sink mounting structure, multiple screws are installed to ensure uniform force distribution across multiple chips. During installation, there's a risk of operator carelessness or misaligned threads, leading to improper installation. This can cause warping and uneven force distribution on the hashboard, severely reducing the chip's cooling efficiency and ultimately impacting overall system performance. Summary of the Invention

[0004] The present disclosure provides a screw, a connection assembly, and a circuit module to enable intuitive judgment of the installation position of the screw, effectively avoiding the occurrence of poor installation due to the screw not being locked to a limited position, thereby improving the assembly efficiency and reliability of the circuit board and the heat sink.

[0005] In a first aspect, the present disclosure provides a screw, which includes: a stop portion, a first straight rod portion, and a second straight rod portion connected in sequence along a first direction, wherein a cross-sectional area of ​​the stop portion along the second direction is greater than a cross-sectional area of ​​the first straight rod portion along the second direction, and a cross-sectional area of ​​the first straight rod portion along the second direction is greater than a cross-sectional area of ​​the second straight rod portion along the second direction; the second direction is perpendicular to the first direction; the second straight rod portion includes: a first section and a second section connected to the first section, wherein a projection of the second section along the first direction falls within a projection of the first section along the first direction, an outer circumferential surface of the first section is provided with an external thread, and the second section is farther away from the first straight rod portion than the first section; a length of the second straight rod portion in the first direction is greater than or equal to a length of a nut threadedly connected to the screw via an external thread in the first direction.

[0006] In some possible implementations, an annular groove cooperating with the gasket is provided on the outer circumferential surface of the first straight rod portion, and the projection of the annular groove along the first direction is a circular ring.

[0007] In some possible implementations, a cross-section of the second segment along the second direction is circular or polygonal.

[0008] In a second aspect, the present disclosure provides a circuit module, which includes: a heat sink, a circuit board, a plurality of nuts and a plurality of screws as described in any embodiment of the first aspect; the heat sink and the circuit board are stacked along a first direction, wherein a bare chip is mounted on the first surface of the circuit board, and the heat sink is closer to the first surface than the second surface of the circuit board; the first surface and the second surface are opposite surfaces on the circuit board; each of the plurality of screws passes through the heat sink and the circuit board, and is threadedly connected to each of the plurality of nuts, so as to enable the heat sink to contact the bare chip; wherein the first straight rod portion in the screw passes through the heat sink and abuts the first surface, and the second straight rod portion passes through the circuit board and protrudes from the second surface of the circuit board; the external thread on the second straight rod portion is threadedly connected to the nut, the first end face of the nut abuts the second surface, the second straight rod portion protrudes from the second end face of the nut or is flush with the second end face, the junction of the first section and the second section is located in the middle part of the nut, and the first end face and the second end face are opposite surfaces on the nut.

[0009] In some possible embodiments, the circuit module further includes: an elastic member; wherein the elastic member is sleeved on the outer periphery of the first straight rod portion; the telescopic direction of the elastic member is parallel to the first direction, and the two ends of the elastic member in the telescopic direction respectively abut against the stop portion of the screw and the heat sink.

[0010] In some possible embodiments, when the screw has an annular groove, the circuit module further includes: a gasket, wherein the width of the gasket along the second direction is greater than the width of the first straight rod portion along the second direction; the gasket is fixed in the annular groove, and the heat sink is located between the elastic member and the gasket in the first direction.

[0011] In some possible implementations, the circuit module further includes: a back plate, on which a plurality of first mounting holes are defined; wherein the nuts are fixed in the first mounting holes.

[0012] In the third aspect, the present disclosure provides a connecting assembly, which includes: a screw and a nut; the screw includes: a stop portion, a first straight rod portion and a second straight rod portion connected in sequence along the first direction, wherein the cross-sectional area of ​​the stop portion along the second direction is greater than the cross-sectional area of ​​the first straight rod portion along the second direction, and the cross-sectional area of ​​the first straight rod portion along the second direction is greater than the cross-sectional area of ​​the second straight rod portion along the second direction; the second direction is perpendicular to the first direction; the outer circumferential surface of the second straight rod portion is provided with an external thread; the nut has an inner limit hole and an internal threaded hole opened in sequence along the first direction, wherein the inner limit hole and the internal threaded hole are connected, and the width of the inner limit hole along the second direction is greater than the width of the internal threaded hole along the second direction; the second straight rod portion passes through the inner limit hole and is threadedly connected to the internal threaded hole through the external thread; the length of the second straight rod portion in the first direction is greater than or equal to the length of the nut in the first direction.

[0013] In a fourth aspect, the present disclosure provides a circuit module, the circuit module comprising: a heat sink, a circuit board and a plurality of connection components as described in the third aspect; the heat sink and the circuit board are stacked along a first direction, wherein a bare chip is mounted on the first surface of the circuit board, and the heat sink is closer to the first surface than the second surface of the circuit board; the first surface and the second surface are opposite surfaces on the circuit board; for each of the multiple connection components, a screw in the connection component passes through the heat sink and the circuit board, and is threadedly connected to a nut in the connection component, so that the heat sink is in contact with the bare chip; wherein the first straight rod portion in the screw passes through the heat sink and abuts the first surface, and the second straight rod portion in the screw passes through the circuit board and protrudes from the second surface; the external thread on the second straight rod portion is threadedly connected to the nut, the first end face of the nut abuts the second surface, the second straight rod portion protrudes from the second end face of the nut or is flush with the second end face, and the first end face and the second end face are opposite surfaces on the nut; the first end face is closer to the inner limit hole than the inner threaded hole.

[0014] Compared with the prior art, the technical solution provided by the present disclosure has the following beneficial effects:

[0015] In the present disclosure, the screws and nuts have specific relative positions, which makes it easy to intuitively judge the installation position of the screws during the assembly process of the circuit board and the radiator, effectively avoiding the occurrence of poor installation where the screws are not locked to the specified position, and improving assembly efficiency and assembly reliability.

[0016] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0018] Figure 1 A schematic structural diagram of a radiator provided in an embodiment of the present disclosure;

[0019] Figure 2 A schematic diagram of a screw installation sequence provided in an embodiment of the present disclosure;

[0020] Figure 3 A schematic diagram of a screw inspection sequence provided in an embodiment of the present disclosure;

[0021] Figure 4 A schematic structural diagram of a first circuit module provided in an embodiment of the present disclosure;

[0022] Figure 5 A schematic structural diagram of a second circuit module provided in an embodiment of the present disclosure;

[0023] Figure 6 A schematic structural diagram of a first type of screw provided in an embodiment of the present disclosure;

[0024] Figure 7 A schematic structural diagram of a second type of screw provided in an embodiment of the present disclosure;

[0025] Figure 8 A schematic structural diagram of a third circuit module provided in an embodiment of the present disclosure;

[0026] Figure 9 for Figure 8 Schematic diagram of the structure of region A in FIG;

[0027] Figure 10 A schematic structural diagram of a fourth circuit module provided in an embodiment of the present disclosure;

[0028] Figure 11 for Figure 10 Schematic diagram of the structure of region B;

[0029] Figure 12 A schematic diagram of the installation process of the first circuit module provided in an embodiment of the present disclosure;

[0030] Figure 13 A schematic diagram of the installation process of the second circuit module provided in an embodiment of the present disclosure;

[0031] Figure 14 A schematic structural diagram of a nut provided in an embodiment of the present disclosure;

[0032] Figure 15 A schematic structural diagram of a connection assembly provided in an embodiment of the present disclosure;

[0033] Figure 16 A schematic structural diagram of a fifth circuit module provided in an embodiment of the present disclosure;

[0034] Figure 17 for Figure 16 Schematic diagram of the structure of the C region;

[0035] Figure 18 A schematic diagram of the installation process of the third circuit module provided in an embodiment of the present disclosure;

[0036] Figure 19 for Figure 18 Schematic diagram of the structure of the D region in . DETAILED DESCRIPTION

[0037] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present disclosure. Rather, they are merely examples of devices consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0038] In order to illustrate the technical solutions disclosed in the present invention, specific embodiments are provided below for illustration.

[0039] With the increasing demand for large-scale computing and high-performance processing applications, current high-density servers place multiple chips on a single hashboard to increase overall computing power. The simultaneous operation of multiple chips increases overall system power consumption. To ensure stable system operation, a single heat sink with better temperature uniformity and lower cost is generally used to dissipate heat from multiple chips.

[0040] Figure 1 This is a schematic diagram of the structure of a radiator provided by an embodiment of the present disclosure. Figure 1 As shown, the heat sink 10 includes a heat sink base plate 101 and heat sink fins 102. When designing the mounting structure of the heat sink 10, multiple screws 20 are placed around a single chip to ensure uniform pressure on the chip's bare die and uniform thermal interface material, thereby improving the chip's heat dissipation. Because a single hash board has multiple chips, each chip requires multiple screws 20, which results in multiple screws 20 on a single heat sink 10. When installing the heat sink 10 on the hash board, there is a risk of operator carelessness or thread misalignment, resulting in a screw 20 on the heat sink being missed or not fully tightened, resulting in occasional poor installation. This poor installation can seriously reduce the chip's heat dissipation, and the hash board may also warp and experience uneven stress, affecting the performance of the entire device.

[0041] In one embodiment, to avoid the above-mentioned improper installation phenomenon, the heat sink 10 is generally fixed according to the order of tightening the screws 20 in the assembly instructions, and then each screw 20 is tightened in sequence (from left to right or from right to left) with a screwdriver for inspection.

[0042] For example, Figure 1 Taking the heat sink 10 shown as an example, an installation procedure of the heat sink 10 is introduced. Figure 2 A schematic diagram of a screw installation sequence provided in an embodiment of the present disclosure. Figure 3 A schematic diagram of a screw inspection sequence provided by an embodiment of the present disclosure. Figure 2 As shown in the figure, the numbers 1 to 16 respectively represent the installation order of locking each screw 20 specified in the assembly instruction book. Through this installation order, it can be ensured that Figure 1The heat sink 10 is shown with the minimum tilt during installation. Figure 3 As shown in the figure, numbers 1 to 16 respectively represent the inspection order of checking whether each screw 20 is locked. Through this inspection order, the Figure 1 The installation status of the screws 20 in the heat sink 10 is checked, thereby completing the installation of the heat sink 10.

[0043] This embodiment has the disadvantages of being inefficient and time-consuming. Furthermore, when a screw 20 is not installed to the designed size, the thread may become misaligned and stuck. Even if a screwdriver is used to check the tightness, it is not possible to completely avoid the situation where the screw 20 is not tightened, thereby failing to avoid the risk.

[0044] In one embodiment, in order to observe whether all the screws 20 have been tightened to the limit position and there is no poor installation phenomenon such as missed locking or incomplete tightening, the length of the screw 20 can be extended so that after the screw 20 is screwed to the limit position, the top surface of its head is flush with the top of the heat dissipation fin 102 of the radiator 10.

[0045] For example, Figure 4 A schematic structural diagram of the first circuit module provided in an embodiment of the present disclosure. Figure 5 This is a structural diagram of the second circuit module provided by the embodiment of the present disclosure. Figures 4 and 5 As shown, the circuit module 30 may include: a heat sink 10, a screw 20, a circuit board 31, a nut 32 and an elastic member 33. A bare chip 311 of a chip is provided on the circuit board 31. Figure 4 In the embodiment, when the die 311 has the maximum thickness, the top surface of the head of the screw 20 is flush with the top of the heat dissipation fin 102 of the heat sink 10. Figure 5 In the embodiment, when the die 311 has the minimum thickness, there is a gap δ between the top surface of the head of the screw 20 and the top of the heat dissipation fin 102 of the heat sink 10 .

[0046] In this embodiment, since the heat sink base plate 101 and the screw 20 are in contact with each other via the elastic member 33, the heat sink 10 is elastically fixed to the circuit board 31. Due to the tolerance of the chip, the height of the heat sink 10 after being installed on the circuit board 31 is floating. This means that the top surface of the head of the screw 20 cannot always be flush with the top of the heat sink 102. It can be seen that in the above-mentioned scheme of extending the length of the screw 20 so that the top surface of the head of the screw 20 is flush with the top of the heat sink 102, the reference for whether the screw 20 is installed to the limit position is unclear and cannot provide an accurate conclusion. In addition, when using the above-mentioned scheme, since the top surface of the head of the screw 20 is to be flush with the top of the heat sink 102, the length of the screw rod of the screw 20 and the elastic member 33 needs to be increased to the height of the heat sink 102, which leads to an increase in the material required for the screw 20 and the elastic member 33, and defects such as increased cost and weight of the circuit module 30.

[0047] In order to solve the above problems, the embodiments of the present disclosure provide a screw and circuit module to enable intuitive judgment of the installation position of the screw, effectively avoid the occurrence of poor installation caused by the screw not being locked to the specified position, and thereby improve the assembly efficiency and assembly reliability of the circuit board and the radiator.

[0048] In a first aspect, an embodiment of the present disclosure provides a screw. Figure 6 This is a schematic diagram of the structure of the first screw provided in the embodiment of the present disclosure. Figure 6 As shown, the screw 20 includes: a stopper portion 21, a first straight rod portion 22, and a second straight rod portion 23, which are sequentially connected along the first direction. The cross-sectional area of ​​the stopper portion 21 along the second direction is larger than the cross-sectional area of ​​the first straight rod portion 22 along the second direction, and the cross-sectional area of ​​the first straight rod portion 22 along the second direction is larger than the cross-sectional area of ​​the second straight rod portion 23 along the second direction. The second direction is perpendicular to the first direction. It can be understood that the stopper portion 21 can be the top of the screw 20, the first straight rod portion 22 can be the middle portion of the screw 20, and the second straight rod portion 23 can be the bottom of the screw 20. From the top of the screw 20 to the bottom of the screw 20 (i.e., the first direction), the cross-sectional area of ​​the screw 20 along the second direction gradually decreases, which facilitates the subsequent penetration of the heat sink 10 and the circuit board 31 to obtain the installation of the circuit module 30.

[0049] The second straight rod portion 23 includes a first section 231 and a second section 232 connected to the first section 231. The projection of the second section 232 along the first direction falls within the projection of the first section 231 along the first direction. The outer circumferential surface of the first section 231 is provided with external threads 2311, and the second section 232 is further away from the first straight rod portion 22 than the first section 231. It will be understood that the outer circumferential surface of the first section 231 is provided with external threads 2311, and the first section 231 may be a threaded section of the screw 20. The outer circumferential surface of the second section 232 is not provided with external threads 2311, and the second section 232 may be a plain rod. Here, the second section 232 is further away from the first straight rod portion 22 than the first section 231, so that the second section 232 is located at the bottom of the first section 231. At the same time, the projection of the second section 232 along the first direction falls within the projection of the first section 231 along the first direction, so that when the screw 20 installs the radiator 10 and the circuit board 31 along the first direction, the second section 232 can pass through the nut 32, ensuring that the threaded section of the screw 20 can be threadedly connected to the nut 32.

[0050] When the screw 20 and the nut 32 are connected, the length of the second straight shank 23 of the screw 20 in the first direction is greater than or equal to the length of the nut 32 in the first direction that is threadedly connected to the screw 20 via the external thread 2311. It is understandable that because the length of the second straight shank 23 in the first direction is greater than or equal to the length of the nut 32 in the first direction, when the screw 20 and the nut 32 are connected, the tail of the screw 20 can protrude from an end face of the nut 32 that is away from the stopper 21 of the screw 20, or the tail of the screw 20 can be flush with an end face of the nut 32 that is away from the stopper 21 of the screw 20. This specific relative position between the screw 20 and the nut 32 allows for intuitive observation of the screw's installation position, effectively preventing improper installation where the screw is not locked into the specified position.

[0051] In some embodiments, the nut 32 may be a nut in the related art, and the embodiments of the present application do not specifically limit this.

[0052] In some embodiments, the stopper portion 21 and the first straight rod portion 22 are not provided with external threads 2311. The cross-sectional shapes of the stopper portion 21 and the first straight rod portion 22 along the second direction can be configured according to actual needs and are not limited in this embodiment of the present disclosure. In one embodiment, the cross-sectional shape of the stopper portion 21 along the second direction can be circular; in another embodiment, the cross-sectional shape of the first straight rod portion 22 along the second direction can be quadrilateral.

[0053] In some embodiments, the first section 231 is a cylindrical structure provided with an external thread 2311 .

[0054] In some embodiments, the second section 232 is not provided with external threads 2311. The shape of the cross section of the second section 232 along the second direction can be set according to actual needs, and the embodiment of the present disclosure does not limit this. In one embodiment, the shape of the cross section of the second section 232 along the second direction is circular or polygonal.

[0055] In some embodiments, Figure 7 This is a schematic diagram of the structure of the second screw provided in the embodiment of the present disclosure. Figure 7 As shown, the second straight rod portion 23 also includes a third section 233. One end of the third section 233 is connected to the first straight rod portion 22, and the other end is connected to the first section 231. It can be seen that the third section 233 is located between the first straight rod portion 22 and the first section 231, and the cross-sectional area of ​​the third section 233 along the second direction is smaller than the cross-sectional area of ​​the first straight rod portion 22 along the second direction, thereby forming a step between the third section 233 and the first straight rod portion 22. In this way, when the screw 20 connects the heat sink 10 to the circuit board 31, the second straight rod portion 23 can pass through the circuit board 31 and allow the first straight rod portion 22 to abut against the circuit board 31, thereby controlling the installation position of the circuit board 31.

[0056] In one embodiment, the length of the third section 233 along the first direction can be the same as the length of the circuit board 31 along the first direction, so that the first section 231 and the second section 232 can protrude from the surface of the circuit board 31, facilitating the threaded connection between the external thread 2311 of the first section 231 and the nut 32.

[0057] In some embodiments, as Figure 7 As shown, the outer circumferential surface of the first straight rod portion 22 is provided with an annular groove 24 that cooperates with the gasket, and the projection of the annular groove 24 along the first direction is a circular ring.

[0058] It is understood that the first straight rod portion 22 has a central axis extending along the first direction, and the annular groove 24 can surround the central axis of the first straight rod portion 22, with the notch of the annular groove 24 facing away from the central axis of the first straight rod portion 22, so that the projection of the annular groove 24 along the first direction is a circular ring. The notch of the annular groove 24 along the first direction forms the outer ring of the circular ring, and the bottom of the annular groove 24 along the first direction forms the inner ring of the circular ring.

[0059] As can be understood, the gasket is used to balance the pressure of the structural member (e.g., bare chip 311) mounted by the screw 20. When the first straight rod portion 22 is provided with an annular groove 24, on the one hand, the gasket installation position can be controlled, thereby controlling the installation position between the heat sink 10 and the circuit board 31, and on the other hand, the stability of the gasket installation can be ensured, so that the gasket can effectively balance the pressure.

[0060] In some embodiments, the depth (i.e., the length of the notch along the second direction) and the width (i.e., the length of the notch along the first direction) of the annular groove 24 can be set according to actual needs and are not limited in this embodiment of the present application. In some embodiments, the annular groove 24 is located at a position where the first straight rod portion 22 is close to the second straight rod portion 23 and away from the stop portion 21.

[0061] In some embodiments, the structure of the gasket can be selected based on actual needs and is not limited in this embodiment of the present application. In some embodiments, the width of the gasket along the second direction is greater than the width of the first straight rod portion 22 along the second direction, so that the gasket can protrude from the first straight rod portion 22, making it easier for the gasket to limit the installation position of the heat sink 10.

[0062] In some embodiments, the screw 20 further includes a coil spring, the expansion and contraction direction of the coil spring being parallel to the first direction. The coil spring can be sleeved on the outer periphery of the first straight rod portion 22 , and one end of the coil spring is connected to the stop portion 21 .

[0063] In the embodiment of the present disclosure, a second section is provided at the bottom of the first section of the second straight rod portion of the screw, that is, a light rod is added at the bottom of the threaded section of the screw, so that the relative position between the screw and the nut can be determined through the light rod, thereby facilitating intuitive judgment of the installation position of the screw during the assembly process of the circuit board and the radiator, effectively avoiding the occurrence of poor installation due to the screw not being locked to the specified position, and improving assembly efficiency and assembly reliability.

[0064] In a second aspect, the present disclosure provides a circuit module. Figure 8 A schematic structural diagram of a third circuit module provided in an embodiment of the present disclosure. Figure 9 for Figure 8 Schematic diagram of the structure of region A in FIG. Figure 9 yes Figure 8 A partial enlarged schematic diagram of area A in FIG. Figures 1 to 9 As shown, the circuit module 30 includes: a heat sink 10, a circuit board 31, a plurality of nuts 32 and a plurality of screws 20 as described in any embodiment of the first aspect.

[0065] The heat sink 10 and the circuit board 31 are stacked along a first direction, wherein a bare chip 311 is mounted on the first surface of the circuit board 31, and the heat sink 10 is closer to the first surface than the second surface of the circuit board 31; the first surface and the second surface are opposite surfaces on the circuit board 31.

[0066] Each screw 20 of the plurality of screws 20 passes through the heat sink 10 and the circuit board 31 and is threadedly connected to each nut 32 of the plurality of nuts 32 , thereby enabling the heat sink 10 to contact the die 311 .

[0067] Among them, the first straight rod portion 22 in the screw 20 passes through the heat sink 10 and abuts against the first surface of the circuit board 31, and the second straight rod portion 23 passes through the circuit board 31 and protrudes from the second surface of the circuit board 31; the external thread 2311 on the second straight rod portion 23 is threadedly connected to the nut 32, the first end face of the nut 32 abuts against the second surface, the second straight rod portion 23 protrudes from the second end face of the nut 32 or is flush with the second end face, the junction of the first section 231 and the second section 232 is located in the middle part of the nut 32, and the first end face and the second end face are opposite surfaces on the nut 32.

[0068] In some embodiments, the structure of the screw 20 can refer to the structure in any embodiment of the first aspect, and for the sake of brevity of the description, it will not be repeated here.

[0069] In some embodiments, the bare die 311, which may also be referred to as a chip die, refers to a crystal grain before the chip is packaged, and is a small piece cut from a silicon wafer using a laser. A complete integrated circuit is present in the bare die 311, and a bare die 311 is an independent functional chip. Since the bare die 311 is made of semiconductor material, the main component of which is silicon, it is relatively fragile and easily damaged when subjected to a large external force. In some embodiments, the chip, which may also be referred to as a bare die chip, refers to the process of mounting the bare die 311 on a chip substrate during chip packaging, and exposing the bare die 311. However, such packaging does not protect the bare die 311.

[0070] In some embodiments, the circuit board 31 , which may also be referred to as a circuit board substrate or substrate, refers to a bare circuit board, that is, a circuit board before components are soldered.

[0071] In some embodiments, each of a plurality of screws 20 is passed through the heat sink 10 and the circuit board 31 stacked in a first direction and threadedly engaged with each of a plurality of nuts 32, thereby enabling contact between the heat sink 10 and the die 311. The screws 20 employ the structure of any of the embodiments of the first aspect, wherein each screw 20 passes through the heat sink 10 and the circuit board 31 in the first direction and is threadedly engaged with each nut 32, thereby enabling the heat sink 10 and the circuit board 31 to be mounted together.

[0072] In some embodiments, the first straight rod 22 of the screw 20 passes through the heat sink 10 and abuts the first surface of the circuit board 31, while the second straight rod 23 passes through the circuit board 31 and protrudes from the second surface of the circuit board 31. The first surface and the second surface are opposite surfaces of the circuit board 31. As can be seen, after passing through the heat sink 10, the first straight rod 22 can abut the first surface of the circuit board 31, thereby restricting the circuit board 31 from fitting around the outer periphery of the second straight rod 23 and ensuring contact between the circuit board 31 and the first straight rod 22. Furthermore, the second straight rod 23 has a fixed length, and the circuit board 31 has a fixed thickness. After the first straight rod 22 abuts the first surface of the circuit board 31, the length of the second straight rod 23 protruding from the second surface of the circuit board 31 is fixed. Therefore, if the nut 32 also has a fixed thickness, the relative position of the second straight rod 23 and the nut 32 can be used to determine whether the screw 20 is installed in the predetermined position.

[0073] Specifically, the external thread 2311 on the second straight rod portion 23 can be threadedly connected to the nut 32, and the first end face of the nut 32 can abut the second surface of the circuit board 31. When the second straight rod portion 23 protrudes from the second end face of the nut 32 or is flush with the second end face, it can be determined that the screw 20 and the nut 32 are assembled to a limited position.

[0074] It is understood that when there are installation problems such as thread misalignment, screw failure, or incomplete tightening, the operator can visually observe from the bottom or side of the heat sink 10 whether the tail of the screw 20 (i.e., the end of the second section 232 away from the circuit board 31) has reached the designed specified position. If it does not meet the specified position, the screw 20 needs to be re-tightened until all screws 20 in the heat sink 10 are tightened to the specified position, thereby improving assembly efficiency and assembly reliability.

[0075] In some embodiments, the junction of the first section 231 and the second section 232 is located in the middle of the nut 32. The middle here refers to the middle of the nut 32 in the first direction.

[0076] It can be understood that the junction of the first section 231 and the second section 232 is located in the middle part of the nut 32, so that the length of the external thread that needs to be connected to the nut 32 in the first direction can be shorter, so that when there are multiple screws 20 that need to be assembled on the heat sink 10, the travel distance of a single screw 20 driving the heat sink 10 along the first direction is shorter, and no large inclination angle will be generated between the multiple assembly positions of the heat sink 10, thereby avoiding the heat sink 10 partially touching the bare chip 311, causing the bare chip 311 to be damaged.

[0077] In some embodiments, due to multiple factors such as chip height, heat sink base thickness, spring compression and circuit board thickness, when the screw 20 is locked to the limit position, the tail of the screw 20 is not necessarily flush with the bottom of the nut 32, but is hidden inside the nut 32, which makes it inconvenient for the operator to judge whether the heat sink 10 is improperly installed. Figure 10 This is a schematic structural diagram of the fourth circuit module provided in an embodiment of the present disclosure. Figure 11 for Figure 10 Schematic diagram of the structure of region B in FIG. Figure 11 yes Figure 10 A partial enlarged schematic diagram of the B area in FIG. Figures 10 and 11 As shown, in the related art, the tail of the screw 20 is hidden in the nut 32, making it difficult to determine whether the screw 20 is tightened to the designed position.

[0078] It can be understood that, compared with the related art, the second section 232 is added in the embodiment of the present disclosure, so that it can be subjectively determined whether the screw 20 is fastened to the designed position, thereby improving assembly efficiency and assembly reliability.

[0079] In some embodiments, by lengthening the length of the threaded section of the screw 20, the tail of the screw and the bottom of the nut 32 are made flush or protruded to a certain height. Figure 12 A schematic diagram of the installation process of the first circuit module provided in an embodiment of the present disclosure. Figure 13 This is a schematic diagram of the installation process of the second circuit module provided in the embodiment of the present disclosure. Figures 12 to 13 As shown, in the solution of only lengthening the length of the threaded section of the screw 20 (i.e., the length of the first section 231 in the first direction), during the installation of the heat sink 10, the tail of the screw 20 will first be made to contact the nut 32. Since the tail of the screw has an external thread, the distance between the heat sink 10 and the circuit board 31 in the first direction is large, and the heat sink 10 will be elevated. Secondly, as the screw 20 is installed, the heat sink 10 gradually moves toward the circuit board 31 along the first direction during the installation process. Due to the increase in the length of the threaded section, the heat sink 10 has a longer travel distance and a larger inclination angle, and the risk of the bare chip 311 being damaged during the installation of the heat sink 10 is higher. Compared with the solution of adding a light rod at the tail of the threaded section in the embodiment of the present disclosure (i.e., adding the second section 232), the light rod in the embodiment of the present disclosure can extend into the interior of the nut 32, so the distance between the heat sink 10 and the circuit board 31 in the first direction is smaller, and the heat sink will not be elevated. At this time, the travel distance of the heat sink 10 during the installation process does not change much, and an excessively large tilt angle will not be generated, thereby ensuring that the bare chip 311 is not damaged during the installation process of the heat sink 10.

[0080] Understandably, based on the above Figures 12 to 13It can be seen that the junction of the first section 231 and the second section 232 is located in the middle portion of the nut 32 , which can effectively control the travel distance of the heat sink 10 along the first direction, thereby protecting the die 311 .

[0081] In some embodiments, in order to ensure good heat transfer effect, in the circuit module, the heat sink 10 and the bare chip 311 must be in full contact, and interface material needs to be added. According to the characteristics of the interface material, the pressure of the interface material is between 10 and 30 pounds per square inch, and its heat transfer effect is relatively ideal. This means that a certain pressure needs to be applied between the bare chip 311 and the heat sink 10. Therefore, when the screw 20 connects the circuit board 31 and the heat sink 10, it is also necessary to accurately control the position of the heat sink 10 and the circuit board 31, and then control the pressure between the bare chip 311 and the heat sink 10, reducing the risk of the bare chip 311 being damaged due to excessive force.

[0082] In some embodiments, see Figures 8 and 9 As shown, in order to fully consider the stress on the die 311 and avoid the risk of damage to the die 311 due to excessive stress, the circuit module 30 further includes an elastic member 33. The elastic member 33 is sleeved on the outer periphery of the first straight rod portion 22. The elastic member 33 extends in a direction parallel to the first direction. Both ends of the elastic member 33 in the extension direction respectively abut against the stopper 21 of the screw 20 and the heat sink 10.

[0083] It is understood that one end of the elastic member 33 can abut against the surface of the stopper 21 close to the circuit board 31, and the other end of the elastic member 33 can abut against the surface of the heat dissipation base plate 101 of the heat sink 10 away from the circuit board 31. The elastic member 33 enables indirect abutment between the heat sink 10 and the stopper 21, allowing the heat sink 10 to be tightened using the elastic mounting method, thereby controlling the pressure between the heat sink 10 and the die 311 and protecting the die 311.

[0084] In some embodiments, the elastic member 33 may be a coil spring. In one embodiment, when the screw 20 includes a coil spring, the coil spring of the screw 20 itself may also be used to achieve indirect contact between the heat sink 10 and the stopper 21 .

[0085] In some embodiments, when the screw 20 has an annular groove 24 , the circuit module further includes a gasket 34 . The gasket 34 is fixed in the annular groove 24 and the heat sink 10 is located between the elastic member 33 and the gasket 34 in the first direction.

[0086] It will be appreciated that, in the first direction, the spacer 34 is spaced a first distance from the upper surface of the circuit board 31 to the circuit board 31. This first distance may be equal to the thickness of the die 311, or slightly greater than the thickness of the die 311. This first distance ensures that the spacer can effectively balance the pressure from the heat sink 10.

[0087] In some embodiments, the width of the gasket along the second direction is greater than the width of the first straight rod portion along the second direction, so that the gasket can protrude from the first straight rod portion 22 , making it easier for the gasket to limit the installation position of the heat sink 10 .

[0088] In some embodiments, Figure 14 This is a schematic diagram of the structure of a nut provided in an embodiment of the present disclosure. Figure 14 As shown, an annular boss 321 is provided at one end of the nut 32 close to the second end surface. The annular boss 321 abuts against the first section 231 of the screw 20 and surrounds the second section 232 of the screw 20.

[0089] It can be understood that an annular boss 321 can be provided at the end of the nut 32 away from the second end face of the circuit board 31. The annular boss 321 has a structure extending from the inner surface of the nut 32 along the second direction toward the central axis of the nut 32. A through hole 322 is formed in the middle part of the annular boss 321, and the through hole 322 connects the internal space of the nut 32 and the external environment. The cross-sectional area of ​​the through hole 322 along the second direction is larger than the cross-sectional area of ​​the second section 232 along the second direction, and smaller than the cross-sectional area of ​​the first section 231 along the second direction, thereby allowing the second section 232 to pass through and not allowing the first section 231 to pass through. The annular boss 321 can abut against the first section 231 to block the first section 231 from moving along the first direction, thereby controlling the installation position of the screw 20.

[0090] In some embodiments, see Figures 8 and 9 As shown, the circuit module 30 further includes a back plate 35 , on which a plurality of first mounting holes are defined; wherein nuts 32 are fixed in the first mounting holes.

[0091] It can be understood that the back plate 35 can be a radiator back plate. By opening a first mounting hole on the back plate 35 and fixing the nut 32 in the first mounting hole, the radiator 10 and the radiator back plate can be installed while the screw 20 and the nut 32 are threadedly connected.

[0092] In some embodiments, the circuit board 31 is provided with a plurality of second mounting holes, through which the screws 20 pass through the circuit board 31 . The plurality of second mounting holes are arranged around the die 311 .

[0093] It is understandable that the multiple second mounting holes on the circuit board 31 can be arranged around the bare chip 311, so that the bare chip 311 is subjected to the same force in all directions, thereby improving the stability and heat dissipation performance of the circuit module.

[0094] In the disclosed embodiment, the screw passes through the heat sink and the circuit board and is threadedly connected to the nut, so that the heat sink can contact the bare chip on the circuit board. At the same time, the tail of the screw has a preset relative position compared to the nut, so that it is possible to intuitively judge whether the screw has reached the limited position, effectively avoiding the occurrence of poor installation caused by the screw not being locked to the limited position, and improving assembly efficiency and assembly reliability.

[0095] In a third aspect, an embodiment of the present disclosure provides a connection component. Figure 15 This is a structural diagram of a connection component provided by an embodiment of the present disclosure. Figure 15 As shown, the connecting assembly 40 includes a screw 20 and a nut 32. The screw 20 includes a stopper 21, a first straight rod 22, and a second straight rod 23, which are sequentially connected along a first direction. The cross-sectional area of ​​the stopper 21 along the second direction is larger than the cross-sectional area of ​​the first straight rod 22 along the second direction, and the cross-sectional area of ​​the first straight rod 22 along the second direction is larger than the cross-sectional area of ​​the second straight rod 23 along the second direction. The second direction is perpendicular to the first direction. It is understood that the stopper 21 can be the top of the screw 20, the first straight rod 22 can be the middle portion of the screw 20, and the second straight rod 23 can be the bottom of the screw 20. The cross-sectional area of ​​the screw 20 along the second direction gradually decreases from the top to the bottom of the screw 20 (i.e., in the first direction), which facilitates subsequent insertion through the heat sink 10 and circuit board 31 to install the circuit module 30. The outer circumferential surface of the second straight rod 23 is provided with external threads 2311, which can be the threaded section of the screw 20.

[0096] The nut 32 has an inner stopper hole 321 and an internally threaded hole 322, which are sequentially formed along a first direction. The inner stopper hole 321 and the internally threaded hole 322 are connected, and the width of the inner stopper hole 321 along the second direction is greater than the width of the internally threaded hole 322 along the second direction. It will be appreciated that the threaded hole of the nut 32 consists of two parts: one part is the inner stopper hole 321 without internal threads, and the other part is the internally threaded hole 322 with internal threads. The width of the inner stopper hole 321 along the second direction is greater than the width of the internally threaded hole 322 along the second direction, allowing the inner stopper hole 321 to accommodate wider structural components.

[0097] When the screw 20 and the nut 32 are connected, the second straight shank 23 of the screw 20 can pass through the inner limiting hole 321 of the nut 32 and be threadedly connected to the inner threaded hole 322 of the nut 32 via the external thread 3211 of the screw 20. The length of the second straight shank 23 of the screw 20 in the first direction is greater than or equal to the length of the nut 32 in the first direction. It is understood that because the length of the second straight shank 23 in the first direction is greater than or equal to the length of the nut 32 in the first direction, when the screw 20 and the nut 32 are connected, the tail of the screw 20 can protrude from an end face of the nut 32 away from the stopper 21 of the screw 20, or the tail of the screw 20 can be flush with an end face of the nut 32 away from the stopper 21 of the screw 20. This specific relative position between the screw 20 and the nut 32 allows for intuitive observation of the screw's installation position, effectively preventing improper installation where the screw is not locked into the specified position.

[0098] It should be noted that the screw 20 in this embodiment differs from the screw 20 described in the first aspect only in the structure of the second straight rod portion 22. Other structures of the screw 20, such as the stop portion 21, the first straight rod portion 22, and the annular groove 24, can be found in the description of any of the embodiments of the first aspect and are not further described here for the sake of brevity.

[0099] In the disclosed embodiment, the connection assembly can intuitively determine the installation position of the screw, effectively avoiding the occurrence of poor installation where the screw is not locked to the specified position, thereby improving assembly efficiency and assembly reliability.

[0100] In a fourth aspect, an embodiment of the present disclosure provides a connection component. Figure 16 This is a schematic structural diagram of the fifth circuit module provided in an embodiment of the present disclosure. Figure 17 for Figure 16 Schematic diagram of the structure of the C region in FIG. Figure 17 yes Figure 16 A local enlarged schematic diagram of the C region in FIG. Figures 16 and 17 As shown, the circuit module 30 includes: a heat sink 10, a circuit board 31, and a plurality of connection assemblies 40 as described in any embodiment of the third aspect. The heat sink 10 and the circuit board 31 are stacked along a first direction, wherein a bare die 311 is mounted on the first surface of the circuit board 31, and the heat sink 10 is closer to the first surface than the second surface of the circuit board 31; the first surface and the second surface are opposite surfaces of the circuit board 31.

[0101] The connecting assembly 40 includes a screw 20 and a nut 32. The specific structures of the screw 20 and the nut 32 can be found in the description of any embodiment of the third aspect, and will not be described here for the sake of brevity.

[0102] For each of the plurality of connection assemblies 40 , the screw 20 of the connection assembly 40 passes through the heat sink 10 and the circuit board 31 and is threadedly connected to the nut 32 of the connection assembly 40 , thereby enabling the heat sink 10 to contact the die 311 .

[0103] Among them, the first straight rod portion 22 in the screw 20 passes through the radiator 10 and abuts against the first surface of the circuit board 31, and the second straight rod portion 23 passes through the circuit board 31 and protrudes from the second surface of the circuit board 31; the external thread 2311 on the second straight rod portion 23 is threadedly connected with the nut 32, the first end face of the nut 32 abuts against the second surface, the second straight rod portion 23 protrudes from the second end face of the nut 32 or is flush with the second end face, the first end face and the second end face are opposite surfaces on the nut 32, and the first end face is closer to the inner limit hole 321 than the internal threaded hole 322.

[0104] It can be understood that the structures such as the bare chip 311 and the circuit board 31 can refer to the description in any embodiment of the second aspect. For the sake of brevity of the description, they will not be repeated here.

[0105] In some embodiments, each of a plurality of screws 20 is passed through the heat sink 10 and the circuit board 31 stacked in a first direction and threadedly engaged with each of a plurality of nuts 32, thereby enabling the heat sink 10 to contact the die 311. The screws 20 employ the structure of any of the embodiments of the third aspect, where one screw 20 passes through the heat sink 10 and the circuit board 31 in the first direction and is threadedly engaged with one nut 32, thereby enabling the heat sink 10 and the circuit board 31 to be mounted together.

[0106] In some embodiments, the first straight rod 22 of the screw 20 passes through the heat sink 10 and abuts the first surface of the circuit board 31, while the second straight rod 23 passes through the circuit board 31 and protrudes from the second surface of the circuit board 31. The first surface and the second surface are opposite surfaces of the circuit board 31. As can be seen, after passing through the heat sink 10, the first straight rod 22 can abut the first surface of the circuit board 31, thereby restricting the circuit board 31 from fitting around the outer periphery of the second straight rod 23 and ensuring contact between the circuit board 31 and the first straight rod 22. Furthermore, the second straight rod 23 has a fixed length, and the circuit board 31 has a fixed thickness. After the first straight rod 22 abuts the first surface of the circuit board 31, the length of the second straight rod 23 protruding from the second surface of the circuit board 31 is fixed. Therefore, if the nut 32 also has a fixed thickness, the relative position of the second straight rod 23 and the nut 32 can be used to determine whether the screw 20 is installed in the predetermined position.

[0107] Specifically, the external thread 2311 on the second straight rod portion 23 can be threadedly connected to the nut 32, and the first end face of the nut 32 can abut the second surface of the circuit board 31. When the second straight rod portion 23 protrudes from the second end face of the nut 32 or is flush with the second end face, it can be determined that the screw 20 and the nut 32 are assembled to a limited position.

[0108] It is understood that when there are installation problems such as thread misalignment, screw failure, or incomplete tightening, the operator can visually observe from the bottom or side of the heat sink 10 whether the tail of the screw 20 (i.e., the end of the second section 232 away from the circuit board 31) has reached the designed specified position. If it does not meet the specified position, the screw 20 needs to be re-tightened until all screws 20 in the heat sink 10 are tightened to the specified position, thereby improving assembly efficiency and assembly reliability.

[0109] In some embodiments, the first end surface is closer to the inner stop hole 321 than to the inner threaded hole 322. This allows the screw 20 to first pass through the inner stop hole 321 during installation, abutting against the inner threaded hole 322. This effectively lowers the height of the heat sink 10 to which the screw 20 is attached, minimizing the distance between the heat sink 10 and the circuit board 31 in the first direction and preventing the heat sink from being elevated. This minimizes the distance traveled by the heat sink 10 during installation and prevents excessive tilt angles, thus protecting the die 311 from damage during installation.

[0110] Understandably, see Figures 12 to 13 As shown, in the solution of only lengthening the length of the threaded section of the screw 20 (i.e., the length of the first section 231 in the first direction), during the installation of the radiator 10, the tail of the screw 20 will first be made to contact the nut 32. Since the tail of the screw has an external thread, the distance between the radiator 10 and the circuit board 31 in the first direction is large, and the radiator 10 will be elevated. Secondly, as the screw 20 is installed, the radiator 10 gradually moves toward the circuit board 31 along the first direction during the installation process. Due to the increase in the length of the threaded section, the radiator 10 has a longer travel distance and a larger inclination angle, and the risk of the bare chip 311 being damaged during the installation of the radiator 10 is higher. In the embodiment of the present disclosure, the internal limit hole 321 allows the screw 20 to extend into the inside of the nut 32 before installation, so that the radiator will not be elevated, ensuring that the bare chip 311 is not damaged during the installation of the radiator 10.

[0111] For example, Figure 18 A schematic diagram of the installation process of the third circuit module provided in an embodiment of the present disclosure. Figure 19 for Figure 18 Schematic diagram of the structure of the D region in FIG. Figure 19 yes Figure 18A local enlarged schematic diagram of the D region in FIG. Figures 18 and 19 As shown, when the nut 32 in the connecting assembly 40 has an inner limiting hole 321, the screw 20 can be inserted into the nut 32 before installation and abut against the inner threaded hole 322 near the circuit board 31. Figures 12 to 13 In the structure shown, the screw 20 can drive the heat sink 10 to descend a certain height, so that the tilt angle during the installation process is smaller, thereby protecting the bare chip 311.

[0112] In some embodiments, the length of the inner limiting hole 321 in the first direction can be selected according to actual needs, and the embodiments of the present disclosure do not specifically limit this.

[0113] It should be noted that the circuit module 30 in this embodiment differs from the circuit module 30 described in the second aspect only in the structures of the screw 20 and the nut 31. Other structures in the circuit module 30, such as the elastic member 33 and the gasket 34, can be found in the description of any embodiment of the second aspect and are not further described here for the sake of brevity.

[0114] In the disclosed embodiment, the screw passes through the heat sink and the circuit board and is threadedly connected to the nut, so that the heat sink can contact the bare chip on the circuit board. At the same time, the tail of the screw has a preset relative position compared to the nut, so that it is possible to intuitively judge whether the screw has reached the limited position, effectively avoiding the occurrence of poor installation caused by the screw not being locked to the limited position, and improving assembly efficiency and assembly reliability.

[0115] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

[0116] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A screw, characterized in that: The screw comprises: The stopper, the first straight rod, and the second straight rod are sequentially connected along a first direction, wherein a cross-sectional area of ​​the stopper along a second direction is larger than a cross-sectional area of ​​the first straight rod along the second direction, and a cross-sectional area of ​​the first straight rod along the second direction is larger than a cross-sectional area of ​​the second straight rod along the second direction; and the second direction is perpendicular to the first direction; The second straight rod portion includes: a first section and a second section connected to the first section, wherein a projection of the second section along the first direction falls within a projection of the first section along the first direction, an outer circumferential surface of the first section is provided with an external thread, and the second section is farther away from the first straight rod portion than the first section; The length of the second straight rod portion in the first direction is greater than or equal to the length of the nut threadedly connected to the screw through the external thread in the first direction.

2. The screw according to claim 1, characterized in that An annular groove cooperating with the gasket is provided on the outer circumferential surface of the first straight rod portion, and the projection of the annular groove along the first direction is a circular ring.

3. The screw according to claim 1, characterized in that A cross-section of the second segment along the second direction is circular or polygonal.

4. A circuit module, characterized in that: The circuit module comprises: a heat sink, a circuit board, a plurality of nuts and a plurality of screws according to any one of claims 1 to 3; The heat sink and the circuit board are stacked along a first direction, wherein a bare chip is mounted on a first surface of the circuit board, and the heat sink is closer to the first surface than to the second surface of the circuit board; the first surface and the second surface are opposite surfaces of the circuit board; Each of a plurality of screws passes through the heat sink and the circuit board and is threadedly connected to each of a plurality of nuts, so as to enable the heat sink to contact the die; Particularly, the first straight rod portion in the screw passes through the heat sink and abuts against the first surface, and the second straight rod portion in the screw passes through the circuit board and protrudes from the second surface; the external thread on the second straight rod portion is threadedly connected to the nut, the first end face of the nut abuts against the second surface, the second straight rod portion protrudes from the second end face of the nut or is flush with the second end face, the junction of the first section and the second section is located in the middle part of the nut, and the first end face and the second end face are opposite surfaces on the nut.

5. The circuit module according to claim 4, wherein: The circuit module further includes: an elastic member; The elastic member is sleeved on the outer periphery of the first straight rod portion; the telescopic direction of the elastic member is parallel to the first direction, and both ends of the elastic member in the telescopic direction are respectively in contact with the stop portion of the screw and the radiator.

6. The circuit module according to claim 5, wherein: When the screw has an annular groove, the circuit module further comprises: a gasket, wherein the width of the gasket along the second direction is greater than the width of the first straight rod portion along the second direction; The gasket is fixed in the annular groove, and the heat sink is located between the elastic member and the gasket in the first direction.

7. The circuit module according to claim 4, wherein: The circuit module further includes: a back plate, wherein a plurality of first mounting holes are provided on the back plate; Wherein, the nut is fixed in the first mounting hole.

8. A connection assembly, characterized in that: The connecting assembly includes: a screw and a nut; The screw comprises: a stopper, a first straight rod, and a second straight rod connected in sequence along a first direction, wherein a cross-sectional area of ​​the stopper along a second direction is larger than a cross-sectional area of ​​the first straight rod, and a cross-sectional area of ​​the first straight rod along the second direction is larger than a cross-sectional area of ​​the second straight rod; the second direction is perpendicular to the first direction; and an outer circumferential surface of the second straight rod is provided with an external thread; The nut has an inner limiting hole and an internal threaded hole sequentially opened along a first direction, wherein the inner limiting hole and the internal threaded hole are connected, and the width of the inner limiting hole along the second direction is greater than the width of the internal threaded hole along the second direction; The second straight rod portion passes through the inner limiting hole and is threadedly connected to the inner threaded hole through the outer thread; the length of the second straight rod portion in the first direction is greater than or equal to the length of the nut in the first direction.

9. A circuit module, characterized in that: The circuit module comprises: a heat sink, a circuit board and a plurality of connection components according to claim 8; The heat sink and the circuit board are stacked along a first direction, wherein a bare chip is mounted on a first surface of the circuit board, and the heat sink is closer to the first surface than to the second surface of the circuit board; the first surface and the second surface are opposite surfaces of the circuit board; For each of the plurality of connecting assemblies, a screw in the connecting assembly passes through the heat sink and the circuit board and is threadedly connected to a nut in the connecting assembly, so that the heat sink is in contact with the die; In which, the first straight rod portion in the screw passes through the heat sink and abuts against the first surface, and the second straight rod portion in the screw passes through the circuit board and protrudes from the second surface; the external thread on the second straight rod portion is threadedly connected to the nut, the first end face of the nut abuts against the second surface, the second straight rod portion protrudes from the second end face of the nut or is flush with the second end face, the first end face and the second end face are opposite surfaces on the nut; the first end face is closer to the inner limit hole than the internal threaded hole.

10. The circuit module according to claim 9, wherein: The circuit module further includes: an elastic member; The elastic member is sleeved on the outer periphery of the first straight rod portion; the telescopic direction of the elastic member is parallel to the first direction, and both ends of the elastic member in the telescopic direction are respectively in contact with the stop portion of the screw and the radiator.

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