CN215682985U - Fixing structure of heat sink - Google Patents

Abstract

The utility model discloses a radiator fixing structure, which comprises: the circuit board is provided with a communication port, and one side of the circuit board is provided with an electronic element; the radiator is in contact fit with the electronic element; the mounting, the mounting is used for being fixed in the circuit board with the radiator, and the mounting includes: the connecting part is used for penetrating through the communication port; the limiting part is connected with the connecting part and is abutted against the surface of the radiator, which faces away from the electronic element; the one end of elasticity buckle links to each other with connecting portion, and the other end is used for propping up with the surface of the radiator of circuit board dorsad, but elasticity buckle elastic deformation makes the other end of elasticity buckle and connecting portion's interval variable. According to the fixing structure of the radiator, the fixing piece is simple in installation process, the circuit board does not need to be turned over, tools are not needed, working hours are saved, the interference between the fixing piece and the circuit board is large, the fixing piece is not easy to loosen, and the fixing reliability is improved.

Description

Fixing structure of heat sink

Technical Field

The utility model relates to the technical field of fixing of radiators, in particular to a radiator fixing structure.

Background

In the related art, a heat sink is fixed to a circuit board by screws to dissipate heat of a heat generating element on the circuit board. This kind of fixed mode is comparatively complicated, need be located two different faces of circuit board respectively with the help of screw tightening tool and radiator and screw, puts the radiator after, just can operate after need turning over the circuit board.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. To this end, an object of the present invention is to propose a heat sink fixing structure which is simple to assemble, does not require the use of tools, and is reliable in connection.

The heat sink fixing structure according to the embodiment of the present invention includes: the circuit board is provided with a communication port, and one side of the circuit board is provided with an electronic element; a heat sink in contact fit with the electronic component; a fixing member for fixing the heat sink to the circuit board, the fixing member including: the connecting part is used for penetrating through the communication port; the limiting part is connected with the connecting part and is abutted against the surface of the radiator, which faces away from the electronic element; the elastic buckle is connected with the connecting part at one end, the other end of the elastic buckle is used for abutting against the surface of the circuit board, which faces away from the radiator, and the elastic buckle can elastically deform so that the distance between the other end of the elastic buckle and the connecting part can be changed.

According to the fixing structure of the radiator, the radiator is fixed on the circuit board through the fixing piece, the fixing piece is simple in installation process, the circuit board does not need to be turned over, tools are not needed, working hours are saved, the fixing piece and the circuit board are large in interference amount due to the elastic buckle and not easy to loosen, and fixing reliability is improved.

In addition, the heat sink fixing structure according to the above embodiment of the present invention may further have the following additional technical features:

according to some embodiments of the utility model, the heat sink is provided with a slot, and the position-limiting part is adapted to be inserted into the slot.

According to some embodiments of the utility model, the fixture further comprises: and one end of the limiting elastic sheet is connected with the limiting part, the other end of the limiting elastic sheet is positioned on one side of the limiting part, and the other side surface of the limiting part and the other end of the limiting elastic sheet are suitable for being respectively abutted against two opposite side surfaces of the slot.

According to some embodiments of the utility model, the distance between the other side of the limiting part and the other end of the limiting elastic sheet is L1, the distance between the two opposite side surfaces of the slot is L2, and L1 > L2.

According to some embodiments of the utility model, a distance between a surface of the heat sink, which is used for abutting against the position limiting part, and a surface of the circuit board, which faces away from the heat sink, is L3, a distance between the position limiting part and the other end of the elastic buckle is L4, and L3 > L4.

According to some embodiments of the utility model, the fixture further comprises: the guide part, the guide part with the elasticity buckle is located respectively the looks dorsal part of connecting portion, the guide part is followed the direction of wearing to establish of connecting portion just to keeping away from the direction of elasticity buckle extends.

According to some embodiments of the utility model, the guide part is a guide plate, one end of the guide plate is connected with the end of the connecting part, and the other end is provided with a chamfer.

According to some embodiments of the utility model, the elastic buckle is a plurality of buckles, and the plurality of buckles are distributed at intervals along the circumference of the connecting part.

According to some embodiments of the utility model, the fixture further comprises: a driving portion for applying a driving force to the connection portion opposite to a penetration direction of the connection portion.

According to some embodiments of the utility model, the driving portion is a driving elastic sheet, the driving elastic sheet is connected with the limiting portion and the connecting portion, and the driving elastic sheet extends towards a direction close to the connecting portion and towards a direction far away from the elastic buckle.

According to some embodiments of the utility model, a distance between the surface of the heat sink, which is used for abutting against the limiting part, and the second side surface is L3, a distance between an end of the driving elastic piece, which is far away from the elastic buckle, and the other end of the elastic buckle is L5, and L5 > L3.

According to some embodiments of the present invention, the driving portion is a coil spring, and the coil spring is sleeved on the connecting portion and is stopped between the limiting portion and the heat sink.

According to some embodiments of the utility model, the fixing member is a plurality of fixing members, and the connecting portions of at least two fixing members are respectively in contact fit with two opposite side surfaces of the heat sink.

According to some embodiments of the utility model, the heat sink is provided with a connection hole through which the connection portion is inserted.

According to some embodiments of the utility model, the circuit board is provided with guide holes, and the heat sink is provided with guide posts adapted to be inserted into the guide holes.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a heat sink fixing structure according to a first embodiment of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1 taken along line A-A;

fig. 3 is a schematic structural view of a heat sink according to a first embodiment of the present invention;

fig. 4 is a schematic structural view of a heat sink according to a first embodiment of the present invention;

fig. 5 is a schematic structural view of a heat sink according to a first embodiment of the present invention;

fig. 6 is a schematic structural view of a heat sink and a fixing member according to a first embodiment of the present invention;

FIG. 7 is a schematic structural view of a fixing member according to a first embodiment of the present invention;

FIG. 8 is a schematic structural view of a fixing member according to a first embodiment of the present invention;

FIG. 9 is a schematic structural view of a fixing member according to a first embodiment of the present invention;

fig. 10 is a schematic structural view of a heat sink fixing structure according to a second embodiment of the present invention;

FIG. 11 is an enlarged schematic view of FIG. 10 at circle B;

fig. 12 is a schematic structural view of a heat sink fixing structure according to a second embodiment of the present invention;

fig. 13 is a schematic structural view of a heat sink fixing structure according to a second embodiment of the present invention;

FIG. 14 is a schematic structural view of a fixing member according to a second embodiment of the present invention, in which a coil spring is in an uncompressed state;

fig. 15 is a schematic structural view of a fixing member according to a second embodiment of the present invention, in which a coil spring is in a compressed state.

Reference numerals:

a heat sink fixing structure 100;

a circuit board 10; an electronic component 11; a communication port 12; a guide hole 13;

a heat sink 20; a slot 21; a connection hole 22; a guide post 23; a heat dissipation plate 24; a heat sink 25;

a fixing member 30; a connecting portion 31; a stopper portion 32; an elastic buckle 33; a limiting elastic sheet 34; a guide portion 35; chamfering 351; a drive section 36; a driving spring 361; a coil spring 362.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

In the description of the present invention, "a first feature" or "a second feature" may include one or more of the features, and "a plurality" means two or more, and the first feature may be "on" or "under" the second feature, and may include the first and second features being in direct contact, or may include the first and second features being not in direct contact but being in contact with another feature therebetween, and the first feature being "on", "above" and "above" the second feature may include the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is higher in level than the second feature.

The circuit board has electronic components that generate heat during operation, and therefore heat dissipation is required for the electronic components that generate heat. In the related art, a heat sink is fixed to a circuit board by screws to dissipate heat of a heat generating element on the circuit board. This kind of fixed mode is comparatively complicated, needs to install by screw tightening tool with the help of the screw, and radiator and screw are installed by two different faces of circuit board respectively, consequently, puts the radiator in good place, just can operate the screw of screwing up after needing to overturn the circuit board.

Based on this, the present invention provides a heat sink fixing structure 100, which omits screws in the related art, so that a screw tightening tool is not required, and the fixing member 30 of the present invention fixes the heat sink 20, the fixing member 30 and the heat sink 20 can be installed on the same surface of the circuit board 10, and the installation can be completed only by pressing with hands, which is simple and convenient to operate, and is beneficial to improving the assembly efficiency and saving the working hours.

A heat sink fixing structure 100 according to an embodiment of the present invention is described below with reference to the drawings.

Referring to fig. 1, 2, and 10 to 13, a heat sink fixing structure 100 according to an embodiment of the present invention may include: a circuit board 10, a heat sink 20, and a fixing member 30. As shown in fig. 6 to 9 and 14 to 15, the fixing member 30 according to an embodiment of the present invention may include: connecting portion 31, spacing portion 32 and elastic catch 33.

Specifically, as shown in fig. 1, 2 and 10-13, an electronic component 11 is disposed on one side of the circuit board 10, and heat generated by the electronic component 11 during operation is formed as a heat generating component. Therefore, the heat sink 20 is required to dissipate heat of the electronic component 11. The heat sink 20 may be in contact with the electronic component 11 so that heat generated by the operation of the electronic component 11 is rapidly conducted to the heat sink 20 and dissipated through the heat sink 20. In some embodiments, the heat sink 20 may be an aluminum member, which has high heat dissipation efficiency, low weight, low cost, and easy manufacturing.

In some embodiments, as shown in fig. 1-6, the heat sink 20 may include a heat dissipation plate 24 and a plurality of heat dissipation fins 25, the heat dissipation fins 25 are spaced apart from each other, and an edge of each heat dissipation fin 25 is connected to the same side surface of the heat dissipation plate 24. The surface of the heat dissipating plate 24 facing away from the heat dissipating fins 25 may abut against the electronic component 11 to achieve surface contact, and the heat of the electronic component 11 is conducted to the heat dissipating plate 24 and further to the heat dissipating fins 25, thereby improving heat dissipating efficiency by the large surface area of the heat dissipating plate 24 and the plurality of heat dissipating fins 25.

In addition, the heat sink 20 is fixed to the circuit board 10 by the fixing member 30, so that the heat sink 20 is in close contact with the circuit board 10, and stable and efficient heat dissipation is maintained. Specifically, the circuit board 10 may be provided with a communication port 12, the communication port 12 communicating with both side surfaces in the thickness direction of the circuit board 10, one of the side surfaces being provided with the electronic component 11. The fixing member 30 may include a connection portion 31, a stopper portion 32, and an elastic catch 33.

As shown in fig. 2 and 12, the position-limiting portion 32 and the elastic buckle 33 are connected to the connecting portion 31 to form a whole. The connecting portion 31 may be inserted through the communication opening 12, so that the stopper portion 32 and the elastic catch 33 may be respectively located at both sides of the circuit board 10 in the thickness direction. The position-limiting portion 32 may abut against a surface (e.g., an upper surface shown in fig. 2) of the heat sink 20 facing away from the electronic component 11 to prevent the heat sink 20 from moving away from the electronic component 11, so as to firmly press the heat sink 20 against the electronic component 11. The elastic catch 33 can abut against a surface (e.g., a lower surface shown in fig. 2) of the circuit board 10 facing away from the heat sink 20, so as to prevent the connecting portion 31 from coming off from the communication port 12, and the fixing member 30 is reliably connected to the circuit board 10, thereby reliably fixing the heat sink 20. The circuit board 10, the electronic component 11 and the heat sink 20 may be sandwiched between the limiting portion 32 and the elastic clip 33 to achieve reliable fixation.

Further, as shown in fig. 2, 6 to 9, and 12 to 15, one end of the elastic catch 33 may be connected to the connection portion 31, the other end of the elastic catch 33 may abut against the circuit board 10, and the elastic catch 33 may be elastically deformed such that the other end of the elastic catch 33 (i.e., an end portion for abutting against the circuit board 10) may be spaced from the connection portion 31 variably. In other words, the elastic buckle 33 extends from one end to the other end in a direction away from the connecting portion 31, so that a certain included angle is formed between the elastic buckle 33 and the connecting portion 31, and the elastic buckle 33 can elastically deform, so that the included angle between the elastic buckle 33 and the connecting portion 31 can be changed. In some embodiments, as shown in fig. 6-7 and 11-12, the elastic buckle 33 extends obliquely toward the direction close to the position-limiting portion 32 and away from the connecting portion 31.

Therefore, during the assembly process, the heat sink 20 may be placed on the electronic component 11, the connection point of the elastic catch 33 and the connection portion 31 is aligned with the communication opening 12, and then the fixing member 30 is pressed to make the elastic catch 33 and the connection portion 31 pass through the communication opening 12. When the elastic catch 33 passes through the communication port 12, the other end of the elastic catch 33 can be elastically deformed in a direction approaching the connection portion 31 by the stopping action of the edge of the communication port 12, so that the elastic catch 33 and the connection portion 31 can smoothly pass through the communication port 12. After the elastic catch 33 passes through the communication port 12, the elastic catch 33 can be restored to its original shape, that is, the other end of the elastic catch 33 moves away from the connection portion 31 to abut against the circuit board 10 and be mounted in place.

The radiator 20 is fixed through the fixing piece 30, the elastic buckle 33 of the fixing piece 30 can elastically deform, the fixing piece 30 is easier to assemble, the circuit board 10 does not need to be turned over with the help of tools, the radiator 20 can be installed in place only by pressing with one hand, and the operation is convenient and fast. And the elastic buckle 33 can be elastically deformed, so that the matching interference amount of the fixing member 30 and the circuit board 10 can be larger, thereby improving the reliability of connection and avoiding the risk of loosening the fixing member 30.

According to the heat sink fixing structure 100 of the embodiment of the utility model, the heat sink 20 is fixed on the circuit board 10 through the fixing member 30, the fixing member 30 is simple in installation process, the circuit board 10 does not need to be turned over, a tool is not needed, the working hours are saved, the elastic buckle 33 enables the fixing member 30 and the circuit board 10 to have large interference amount and not to be easily loosened, and the fixing reliability is improved.

According to some embodiments of the present invention, as shown in fig. 2 to 4, the heat sink 20 may be provided with a slot 21, and the stopper 32 may be inserted into the slot 21. Not only the heat sink 20 is pressed against the electronic component 11, but also the preliminary limit and the anti-shaking limit between the fixing member 30 and the heat sink 20 can be realized.

Specifically, in the specific embodiment shown in fig. 2 and 3, the limiting portions 32 cooperate with the lower groove walls of the slots 21 to press the heat sink 20 against the electronic component 11; the limiting part 32 is matched with the front groove wall and the rear groove wall of the slot 21 to limit the radiator 20 and the circuit board 10 in the front-rear direction; as shown in fig. 6, during assembly, the position-limiting portion 32 may be inserted into the slot 21 to achieve initial connection between the fixing element 30 and the heat sink 20, and then the fixing element 30 is mounted on the circuit board 10, so that the operation is easier.

According to some embodiments of the present invention, as shown in fig. 2, 7-9, the fixing member 30 may further include a position-limiting elastic sheet 34. The limiting elastic sheet 34 is connected with the limiting part 32 and is suitable for being inserted into the slot 21, and the limiting elastic sheet 34 is stopped between the limiting part 32 and the slot wall of the slot 21 so as to increase the pressing force of the limiting part 32 on the heat sink 20 and prevent the limiting part 32 from being separated from the slot 21.

Specifically, one end (e.g., the lower end shown in fig. 2) of the elastic limit tab 34 may be connected to the limit portion 32, and the other end (e.g., the upper end shown in fig. 2) of the elastic limit tab 34 may be located on one side (e.g., the upper side shown in fig. 2) of the limit portion 32, that is, the other end of the elastic limit tab 34 is spaced apart from the limit portion 32 by a certain distance, so that the elastic limit tab 34 may be elastically deformed relative to the limit portion 32, thereby increasing the abutting force against the groove wall of the slot 21. Moreover, the other side surface (for example, the lower side shown in fig. 2) of the limiting portion 32 and the other end of the limiting elastic sheet 34 may respectively abut against two opposite side surfaces of the slot 21, so that the limiting portion 32 and the limiting elastic sheet 34 are clamped in the slot 21.

In some embodiments, the limiting elastic sheet 34 extends along the insertion direction of the limiting portion 32 and toward a direction close to the limiting portion 32 to form an inclined barb structure, so that in the process of inserting the limiting portion 32 into the insertion slot 21, the other end of the limiting elastic sheet 34 can gradually approach the limiting portion 32 to elastically deform, so that the insertion is easier, and the fixing member 30 is not easily moved against the insertion direction to avoid being loosened.

According to some embodiments of the present invention, as shown in fig. 2 and 7, a distance between the other side of the position-limiting portion 32 and the other end of the position-limiting elastic piece 34 is L1, and a distance between two opposite side surfaces of the slot 21 is L2, wherein L1 > L2. When the limiting portion 32 is inserted into the slot 21, the limiting elastic sheet 34 is elastically deformed, and interference fit is formed between the limiting portion 32 and the slot wall of the slot 21 and between the limiting elastic sheet 34 and the slot wall of the slot 21, so that the fixing member 30 is effectively prevented from being separated from the slot 21, and the connection is more reliable.

According to some embodiments of the present invention, as shown in fig. 7 and 8, the number of the limiting elastic pieces 34 may be multiple, so as to further increase the interference fit effect between the limiting elastic pieces and the slot wall of the slot 21, and improve the anti-dropping effect. In some embodiments, the plurality of limiting elastic pieces 34 may be distributed in an array, which is convenient for processing on one hand and enables the fixing member 30 and the heat sink 20 to be stressed uniformly on the other hand.

In some embodiments, as shown in fig. 7 and 8, the limiting portion 32 may include a main limiting plate and a plurality of branch limiting plates disposed in a coplanar manner, the plurality of branch limiting plates are symmetrically distributed on two sides of the main limiting plate to form a shape similar to a "king" shape, a "dry" shape, and the like, and the plurality of limiting elastic pieces 34 may be respectively connected to the plurality of branch limiting plates, so that the force applied to the limiting portion 32 and the heat sink 20 is more uniform, and the anti-dropping limiting effect is improved. In addition, in above-mentioned structure, spacing portion 32 and spacing shell fragment 34 can be an organic whole, in the course of working, can form a complete metal sheet through cutting processing and bending processing, need not to splice, and the sound construction.

It should be noted that the number of the limiting elastic pieces 34 includes, but is not limited to, four as shown in fig. 8, and the arrangement manner of the plurality of limiting elastic pieces 34 also includes, but is not limited to, that shown in fig. 8, and only the effect of preventing the limiting portion 32 from coming out of the slot 21 needs to be satisfied.

According to some embodiments of the present invention, as shown in fig. 2, a distance between a surface of the heat sink 20 for abutting against the position-limiting portion 32 (e.g., a lower groove wall of the slot 21 shown in fig. 2) and a surface of the circuit board 10 facing away from the heat sink 20 (e.g., a lower surface shown in fig. 2, that is, a surface for abutting against the elastic buckle 33) may be L3, and a distance between the position-limiting portion 32 and the other end of the elastic buckle 33 is L4, where L3 > L4, so that after the fixing member 30 is installed, the position-limiting portion 32 can be in interference fit with the heat sink 20, the elastic buckle 33 can be in interference fit with the circuit board 10, and the heat sink 20 and the circuit board 10 are clamped between the position-limiting portion 32 and the elastic buckle 33, thereby improving the fixing reliability and making the heat conduction between the heat sink 20 and the electronic element 11 more efficient.

According to some embodiments of the present invention, as shown in fig. 7 to 9, the fixing member 30 may further include a guide portion 35, the guide portion 35 and the elastic catch 33 may be respectively disposed on opposite sides of the connecting portion 31, and the guide portion 35 may extend along a penetrating direction of the connecting portion 31 and in a direction away from the elastic catch 33. For example, in the embodiment shown in fig. 2 and 7, the connecting portion 31 passes downward through the communication opening 12, the elastic catch 33 is located on the inner side of the connecting portion 31 (i.e., the side facing the electronic component 11), the guiding portion 35 is located on the outer side of the connecting portion 31 (i.e., the side away from the electronic component 11), and the guiding portion 35 extends obliquely downward and outward. Therefore, when the fixing element 30 is installed, the guide portion 35 passes through the communication opening 12 before the connecting portion 31, and the guide portion 35 can gradually move outwards under the resisting action of the inner edge of the communication opening 12 to drive the connecting portion 31 and the elastic buckle 33 to move outwards, so that the penetrating installation is easier.

In some embodiments, as shown in fig. 7, the angle between the guiding portion 35 and the connecting portion 31 is α, and satisfies 120 ° ≦ α ≦ 160 °, for example, the angle α may be 150 °, and within the above-mentioned range, the guiding portion 35 is more effective.

Further, as shown in fig. 8 and 9, the guide part 35 may be a guide plate, and one end of the guide plate may be connected to an end of the connection part 31, and the other end of the guide plate may be provided with a chamfer 351. In other words, the width of the guide plate at least at the end portion far from the connecting portion 31 decreases progressively along the penetrating direction, and in the specific embodiment shown in fig. 8 and 9, the width of the guide plate decreases progressively downward along the front-rear direction, so that the lower end of the guide plate is more easily inserted and communicated, which is beneficial to improving the installation efficiency.

In some embodiments, as shown in FIG. 9, the chamfer 351 has an angle β, and satisfies an angle β of 20 ≦ β ≦ 40, for example, the included angle β may be 30, within which the guiding and pre-positioning of the guide 35 is more effective.

In the embodiment of the present invention, the specific structure of the elastic buckle 33 can be flexibly set according to actual conditions. In some embodiments, as shown in fig. 8 and 9, the elastic buckle 33 may be an elastic piece, and the fixing member 30 includes an elastic piece with a larger width to provide a reliable fixing. In other embodiments, as shown in fig. 11, 14-15, the number of the elastic buckles 33 may be multiple, and multiple elastic buckles 33 may be distributed at intervals along the circumferential direction of the connecting portion 31 to cooperate with multiple positions on the circumferential edge of the communication port 12, so as to improve the fixing reliability. As in fig. 14, the resilient catch 33 may be a resilient arm.

According to some embodiments of the present invention, as shown in fig. 2 and 12, the fixing member 30 may further include a driving portion 36, and the driving portion 36 may apply a driving force to the connecting portion 31, where the driving force is opposite to the penetrating direction of the connecting portion 31, so that the abutting force between the elastic buckle 33 and the circuit board 10 can be increased, and the connection reliability and the anti-loosening effect can be improved.

In some embodiments, as shown in fig. 2 and fig. 7 to 8, the driving portion 36 may be a driving elastic sheet 361, two ends of the driving elastic sheet 361 are respectively connected to the position-limiting portion 32 and the connecting portion 31, and the driving elastic sheet 361 extends toward the direction close to the connecting portion 31 and away from the elastic buckle 33, and in the example shown in fig. 2, the driving elastic sheet 361 extends outward and upward. In the process of installing the fixing member 30, the limiting portion 32 and the connecting portion 31 are pressed to deform the driving elastic sheet 361, one end of the driving elastic sheet 361, which is connected with the connecting portion 31, moves along the penetrating direction along with the connecting portion 31 until the elastic buckle 33 completely penetrates through the communication port 12 and abuts against the circuit board 10, then the pressing is stopped, the driving elastic sheet 361 rebounds to drive the connecting portion 31 to move along the direction opposite to the penetrating direction, so that the elastic buckle 33 is pressed against the circuit board 10, and the limiting portion 32 presses the heat sink 20 against the electronic element 11.

Further, as shown in fig. 2 and 7, a distance between a surface of the heat sink 20 abutting against the limiting portion 32 and the second side surface of the circuit board 10 is L3, and a distance between an end of the driving elastic piece 361 far away from the elastic buckle 33 and the other end of the elastic buckle 33 is L5, where L5 > L3. So that in the installation process, the driving elastic sheet 361 has enough deformation, and the elastic buckle 33 can completely pass through the communication port 12, and the installation is ensured to be in place.

In other embodiments, as shown in fig. 12, 14 and 15, the driving portion 36 may be a coil spring 362. The coil spring 362 is sleeved on the connecting portion 31, and the coil spring 362 is stopped between the limiting portion 32 and the heat sink 20. In the process of installing the fixing member 30, the connecting portion 31 and the elastic buckle 33 are aligned with the communication port 12, the limiting portion 32 is pressed to gradually compress the coil spring 362, the connecting portion 31 and the elastic buckle 33 gradually pass through the communication port 12, after the elastic buckle 33 completely passes through the communication port 12, the pressing is stopped, under the effect of the resilience force of the coil spring 362 in the compressed state, the connecting portion 31 has a tendency of moving in the opposite direction of the penetrating direction, so that the elastic buckle 33 is pressed against the circuit board 10, and the limiting portion 32 indirectly presses the heat sink 20 against the electronic element 11 through the coil spring 362.

According to some embodiments of the present invention, as shown in fig. 2 and 6, the fixing member 30 may be a plurality of fixing members, wherein the connecting portions 31 of at least two fixing members 30 are respectively located on two sides of the heat sink 20 opposite to each other, and when the fixing members 30 are installed in place, the connecting portions 31 can be in contact fit with the corresponding side surfaces of the heat sink 20. Specifically, in the embodiment where the heat sink 20 is provided with the insertion groove 21, when the connection portion 31 abuts against the side surface of the heat sink 20, it means that the stopper portion 32 is inserted into the insertion groove 21 in place. The heat sink 20 can be further limited perpendicular to the penetrating direction by the connecting portions 31 of the two fixing members 30, so that the heat sink 20 is fixed relative to the circuit board 10 in the three-dimensional direction.

According to other embodiments of the present invention, as shown in fig. 11 and 12, the heat sink 20 may be provided with the connection hole 22, and the connection portion 31 may also be penetrated through the connection hole 22, in other words, the connection portion 31 is penetrated through both the connection hole 22 and the communication port 12, so as to limit the heat sink 20 and the circuit board 10 in a direction perpendicular to the penetrating direction, so that the heat sink 20 is fixed relative to the circuit board 10 in a three-dimensional direction. Further, the stopper portion 32 may abut against the edge of the connection hole 22, or the coil spring 362 may abut between the stopper portion 32 and the edge of the connection hole 22.

According to some embodiments of the present invention, as shown in fig. 10 and 11, the circuit board 10 may be provided with the guide holes 13, and the heat sink 20 may be provided with the guide posts 23. When the heat sink 20 is mounted on the circuit board 10, the guiding posts 23 can be inserted into the guiding holes 13 to preliminarily position the heat sink 20 and the circuit board 10, so as to prevent the heat sink 20 from shaking, facilitate the assembly of the fixing member 30, and ensure the stability of the electronic component 11 on the circuit board 10.

The heat sink fixing structure 100 according to some embodiments of the present invention will be described in detail with reference to the accompanying drawings, it being understood that the following description is illustrative only and should not be construed as limiting the present invention.

As shown in fig. 1 to 9, a heat sink fixing structure 100 according to a first embodiment of the present invention includes a circuit board 10, a heat sink 20, and a fixing member 30. The heat sink 20 includes a heat dissipating plate 24 and a plurality of heat dissipating fins 25, and the plurality of heat dissipating fins 25 are spaced apart from each other in the front-rear direction on the upper surface of the heat dissipating plate 24. Wherein the lower ends of two adjacent radiating fins 25 are bent and extended to cooperate with the radiating plate 24 to define a slot 21, and the slot 21 has a left side notch and a right side notch. The upper surface of the circuit board 10 is provided with an electronic component 11, and the left side and the right side of the electronic component 11 are respectively provided with a communication port 12.

The fixing member 30 is an integral metal stamping member, and has good elasticity and high production efficiency. The fixing member 30 includes: the connecting plate (i.e. the connecting portion 31), the limiting plate (i.e. the limiting portion 32), the elastic piece (i.e. the elastic buckle 33), the limiting elastic piece 34, the guiding plate (i.e. the guiding portion 35), and the driving elastic piece 361 (i.e. the driving portion 36). The connecting plate extends along the up-and-down direction, and limiting plate and flexure strip are located the inboard of connecting plate, and drive shell fragment 361 connects the outer end of limiting plate and the upper end of connecting plate, and drive shell fragment 361 outwards and tilt up extend, and the flexure strip inwards and tilt up extend, and limiting elastic sheet 34 outwards and tilt up extend. The deflector links to each other and is located the outside of connecting plate with the lower extreme of connecting plate, and the deflector outwards just slopes the extension downwards for the connecting plate. The width of the limiting plate in the front-rear direction is equal to the width of the slot 21, so that the limiting of the fixing member 30 and the heat sink 20 is realized in the front-rear direction.

In the assembling process, the heat dissipation plate 24 is attached above the electronic component 11 so that the communication port 12 is opposed to the slot 21. The limiting plates of the two fixing pieces 30 are inserted into the slots 21 through the left side notches and the right side notches respectively until the connecting plates of the two fixing pieces 30 abut against the left side face and the right side face of the heat dissipation plate 24 respectively, and then the limiting plates are inserted in place, at the moment, the limiting plates and the limiting elastic pieces 34 are in interference fit with the upper groove wall and the lower groove wall of the slots 21 respectively, so that the limiting plates are prevented from being separated from the slots 21, and meanwhile, the fixing pieces 30 and the heat dissipater 20 are limited in the up-down direction. The driving elastic piece 361 is pressed, the lower end of the guide plate firstly extends into the communication opening 12, the inner side surface of the guide plate abuts against the inner edge of the communication opening 12, and the guide plate is driven to move outwards along with the downward movement of the connecting plate so as to drive the connecting plate and the elastic piece to move outwards; when the elastic piece moves to abut against the inner edge of the communication opening 12, the elastic piece elastically deforms outwards to drive the elastic piece 361 to elastically deform downwards, so that the connecting plate and the elastic piece smoothly pass through the communication opening 12 downwards; when the circuit board passes through the elastic piece completely, the pressing is stopped, the elastic piece rebounds to form a larger interference amount with the circuit board 10, and the elastic piece 361 is driven to rebound to enable the elastic piece to move upwards to abut against the lower surface of the circuit board 10, so that the circuit board is installed in place. At this time, the limiting plate and the elastic sheet are pressed firmly against the electronic component 11 by the resilient force of the driving elastic sheet 361.

As shown in fig. 10 to 15, a heat sink fixing structure 100 according to a second embodiment of the present invention includes a circuit board 10, a heat sink 20, and a fixing member 30. The heat sink 20 includes a heat dissipating plate 24 and a plurality of heat dissipating fins 25, and the plurality of heat dissipating fins 25 are spaced apart from each other in the front-rear direction on the upper surface of the heat dissipating plate 24. The left and right ends of the heat radiating plate 24 are provided with the coupling holes 22 and the guide posts 23. The upper surface of the circuit board 10 is provided with an electronic component 11, and the left and right sides of the electronic component 11 are provided with a communication port 12 and a guide hole 13.

The fixing member 30 includes a coil spring 362 (i.e., the driving portion 36), a connecting portion 31, a limiting portion 32, and an elastic buckle 33, wherein the connecting portion 31, the limiting portion 32, and the elastic buckle 33 are integrally formed, and may be a metal member or a plastic member. The connecting portion 31 is a cylinder extending in the up-down direction, the limiting portion 32 is a cylinder with a diameter larger than that of the connecting portion 31, the two elastic buckles 33 are symmetrically arranged along the circumferential direction of the connecting portion 31, the lower end portion of the connecting portion 31 is provided with a conical surface, and the outer side surface of the obliquely extending elastic buckle 33 is in smooth transition connection with the conical surface. The lower end of the connecting portion 31 is further provided with a through hole penetrating along the radial direction, so that the integrated piece can be conveniently processed and molded, and the elastic buckle 33 can be elastically deformed. The coil spring 362 is sleeved on the connecting portion 31.

In the assembling process, the heat sink 24 is attached to the upper side of the electronic component 11 so that the communication port 12 is opposed to the connection hole 22, and the guide post 23 is inserted into the guide hole 13. The connecting portions 31 and the elastic catches 33 of the two fixing members 30 pass through the connecting holes 22 and the communication ports 12 which are oppositely arranged in sequence, and the coil springs 362 are located between the limiting portions 32 and the upper surface of the heat sink 20. The limiting part 32 is pressed, the conical surface part of the lower end part of the connecting part 31 firstly extends into the communication port 12, so that the alignment is easier; as the connecting portion 31 moves downward, the coil spring 362 is gradually compressed, the elastic catch 33 can abut against the edge of the communication port 12, so that the elastic catch 33 is elastically deformed in a direction approaching the connecting portion 31, and the connecting portion 31 and the elastic catch 33 smoothly pass through the communication port 12 downward; when the circuit board passes through the elastic buckle 33, the elastic buckle 33 is pressed to form a larger interference amount with the circuit board 10, and the elastic buckle 33 moves upwards to abut against the lower surface of the circuit board 10 by the resilience force of the coil spring 362 to be installed in place. At this time, the heat sink 20 is firmly pressed against the electronic component 11 by the stopper 32 and the elastic clip 33 due to the resilient force of the coil spring 362.

Other constructions and operations of the heat sink fixing structure 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the terms "embodiment," "particular embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (15)

1. A heat sink fixing structure, characterized by comprising:

the circuit board is provided with a communication port, and one side of the circuit board is provided with an electronic element;

a heat sink in contact fit with the electronic component;

a fixing member for fixing the heat sink to the circuit board, the fixing member including:

the connecting part is used for penetrating through the communication port;

the limiting part is connected with the connecting part and is abutted against the surface of the radiator, which faces away from the electronic element;

the elastic buckle is connected with the connecting part at one end, the other end of the elastic buckle is used for abutting against the surface of the circuit board, which faces away from the radiator, and the elastic buckle can elastically deform so that the distance between the other end of the elastic buckle and the connecting part can be changed.

2. The heat sink fixing structure according to claim 1, wherein the heat sink is provided with a slot, and the position-limiting portion is adapted to be inserted into the slot.

3. The heat sink fixing structure according to claim 2, wherein the fixing member further comprises:

and one end of the limiting elastic sheet is connected with the limiting part, the other end of the limiting elastic sheet is positioned on one side of the limiting part, and the other side surface of the limiting part and the other end of the limiting elastic sheet are suitable for being respectively abutted against two opposite side surfaces of the slot.

4. The heat sink fixing structure of claim 3, wherein the distance between the other side of the position-limiting portion and the other end of the position-limiting elastic piece is L1, the distance between two opposite side surfaces of the slot is L2, and L1 > L2.

5. The heat sink fixing structure of claim 1, wherein a distance between a surface of the heat sink abutting against the position-limiting portion and a surface of the circuit board facing away from the heat sink is L3, a distance between the position-limiting portion and the other end of the elastic clip is L4, and L3 > L4.

6. The heat sink fixing structure according to claim 1, wherein the fixing member further comprises:

the guide part, the guide part with the elasticity buckle is located respectively the looks dorsal part of connecting portion, the guide part is followed the direction of wearing to establish of connecting portion just to keeping away from the direction of elasticity buckle extends.

7. The heat sink fixing structure according to claim 6, wherein the guide portion is a guide plate, one end of the guide plate is connected to an end of the connecting portion, and the other end is provided with a chamfer.

8. The heat sink fixing structure according to claim 1, wherein the plurality of elastic clips are distributed at intervals in a circumferential direction of the connecting portion.

9. The heat sink fixing structure according to claim 1, wherein the fixing member further comprises:

a driving portion for applying a driving force to the connection portion opposite to a penetration direction of the connection portion.

10. The heat sink fixing structure of claim 9, wherein the driving portion is a driving spring, the driving spring connects the limiting portion and the connecting portion, and the driving spring extends in a direction close to the connecting portion and in a direction away from the elastic clip.

11. The heat sink fixing structure of claim 10, wherein a distance between the surface of the heat sink abutting against the limiting portion and the second side surface is L3, a distance between an end of the driving spring piece away from the elastic clip and the other end of the elastic clip is L5, and L5 > L3.

12. The heat sink fixing structure of claim 9, wherein the driving portion is a coil spring, and the coil spring is sleeved on the connecting portion and is stopped between the limiting portion and the heat sink.

13. The heat sink fixing structure according to claim 1, wherein the fixing member is plural, and the connecting portions of at least two fixing members are respectively in contact engagement with two opposite side surfaces of the heat sink.

14. The heat sink fixing structure according to claim 1, wherein the heat sink is provided with a connection hole through which the connection portion is inserted.

15. The heat sink fixing structure according to any one of claims 1 to 14, wherein the circuit board is provided with guide holes, and the heat sink is provided with guide posts adapted to be inserted into the guide holes.

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