CN210112526U - Radiator fastener - Google Patents

Abstract

The utility model relates to a radiator technical field specifically discloses a radiator fastener. In the radiator fastening device, a hollow fastening push nail sequentially penetrates through a second mounting hole in the radiator and a first mounting hole in the PCB and then is clamped on the lower surface of the PCB, and a spring body is arranged between the hollow fastening push nail and the radiator and pushes the radiator to be fixed on the PCB through the elasticity of the spring body; the L-shaped fastening inner pin is clamped in the hollow fastening push nail, and the hollow fastening push nail is outwards expanded along the radial direction of the hollow fastening push nail to prevent the hollow fastening push nail from being deformed by retraction and falling from the first mounting hole; the hook of the spring presses the beam of the L-shaped fastening inner pin to prevent the L-shaped fastening inner pin from slipping axially from the hollow fastening push pin. The three parts of the fastening assembly are mutually clamped, so that the assembly reliability is high, the safety is high, the reworking is convenient, the part processing requirement is low, the cost is low, the good applicability is realized, and the connection stability of the radiator and the PCB is improved.

Description

Radiator fastener

Technical Field

The utility model relates to a radiator technical field especially relates to a radiator fastener.

Background

With the rapid development of the electronic industry, the heat productivity and the heat density of electronic components (heat sources) such as BGA, FPGA, CPU and the like are higher and higher, and reliable thermal interface contact must be ensured in the assembly between a radiator and the heat source, so that the smoothness of a heat radiation channel is ensured. Various heat sinks are respectively provided with a plurality of mounting and fixing methods. Under the condition that the PCB is provided with the plated through holes, the matched columnar springs Coil Spring have the characteristic of stable elasticity coefficient K value, and the load pressure generated by each Spring can be theoretically quantized and calculated and predicted. For the design with high load pressure requirement and sensitive heat dissipation performance to the load pressure, the structure of the push nail and the spring is nearly equivalent to the most traditional installation scheme of a screw spring nut. Compared with a screw spring nut structure, the push pin and spring structure is a common scheme with low cost, reliable installation and less assembly time consumption.

In the existing scheme of pushing nails and springs in the market at present, the L-shaped metal pins are fixed in the height direction and are clamped in the fixing holes only by the interference of the flat parts of the pins, and the L-shaped metal pins are easy to slip and drop in the height direction under the conditions of material performance fluctuation, machining errors, vibration impact and the like, so that the short circuit of a PCB is caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a radiator fastener has improved this radiator fastener's assembly reliability, has improved electronic component's safety in utilization.

To achieve the purpose, the utility model adopts the following technical proposal:

a radiator fastening device comprises a fastening assembly, wherein the fastening assembly is used for fixing a radiator on a PCB (printed circuit board), the fastening assembly comprises a hollow fastening push pin, an L-shaped fastening inner pin and a spring, and the L-shaped fastening inner pin is clamped in the hollow fastening push pin and can outwards prop open the hollow fastening push pin along the radial direction of the hollow fastening push pin; the hollow fastening push nail sequentially penetrates through a second mounting hole in the radiator and a first mounting hole in the PCB, and the bottom of the hollow fastening push nail is clamped on the lower surface of the PCB; the spring comprises a spring body and a hook, the spring body is arranged on the hollow fastening push nail in a compression mode and is located between the hollow fastening push nail and the radiator, and the hook presses the L-shaped fastening inner pin.

According to the preferable technical scheme, the L-shaped fastening inner pin comprises a pin cylinder and a cross beam, the cross beam is arranged at the top end of the pin cylinder, the pin cylinder is clamped in the hollow fastening push pin, the cross beam is clamped at the top of the hollow fastening push pin, and the cross beam is pressed by the hook.

As a preferred technical scheme, the hook is formed by outwards bending a top coil of the spring body.

According to the preferable technical scheme, the hook is of a multi-line bending structure, and the tail end of the hook is arranged below the cross beam and close to the top coil of the spring body.

According to a preferable technical scheme, the pin cylinder is provided with a flat part and an outer convex part, the outer convex part is arranged on two sides of the flat part, and the outer convex part is arc-shaped.

According to the preferable technical scheme, the hollow fastening push nail comprises a push nail head and a push nail cylinder, a limiting groove is formed in the push nail head, the cross beam is clamped in the limiting groove, the push nail cylinder is connected to the lower surface of the push nail head, a guide hole and a fixing hole are formed in the hollow fastening push nail from top to bottom, an in-column axial limiting portion is arranged in the fixing hole, the pin cylinder outwards props the in-column axial limiting portion, an in-column through groove is formed in the lower portion of the push nail cylinder, the flat portion and the outer convex portion are clamped in the in-column through groove, a cylinder axial limiting portion is arranged at the bottom of the push nail cylinder, and the cylinder axial limiting portion penetrates through the first mounting hole and is clamped on the lower surface of the PCB.

Preferably, the size of the guide hole is larger than that of the fixing hole.

As a preferred technical scheme, the axial limiting part of the cylinder comprises a limiting surface and a guide inclined surface positioned below the limiting surface, the limiting surface is abutted with the lower surface of the PCB, and the guide inclined surface is of a conical structure with a large upper part and a small lower part.

As a preferred technical scheme, the axial limiting part of the cylinder is of an elastic structure.

According to the preferable technical scheme, the upper portion of the nail pushing cylinder is provided with an annular boss, an annular accommodating groove is formed between the head portion of the nail pushing cylinder and the annular boss, and the annular accommodating groove is used for clamping a top coil of the spring body.

Compared with the prior art, the utility model discloses an advantage and beneficial effect lie in:

the utility model provides a radiator fastening device, after the hollow fastening ejector pin passes the second mounting hole on the radiator and the first mounting hole on the PCB board in proper order, its bottom joint is in the lower surface of PCB board, L type fastening inner pin card is located in the hollow fastening ejector pin to can prop up the hollow fastening ejector pin outward along the radial of hollow fastening ejector pin, can prevent effectively that the hollow fastening ejector pin from taking place the internal shrinkage deformation and coming loose from slipping from the first mounting hole on the PCB board; the spring body compression sets up between hollow fastening ejector pin and radiator, and the top of pin in the L type fastening is pressed to the couple of spring one end, prevents that pin takes place the axial slippage in the L type fastening ejector pin from hollow fastening ejector pin, and the other end promotes the radiator through the elasticity of self and fixes on the PCB board to realize the heat dissipation of radiator to heating element. The three parts of the fastening assembly are mutually clamped, the assembly reliability is high, the safety is high, the reworking is convenient, the part processing requirement is low, the cost is low, the good applicability is realized, and the connection stability between the radiator and the PCB is obviously improved.

Drawings

Fig. 1 is a top view of an assembly structure of a heat sink fastening device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a PCB board according to a first embodiment of the present invention;

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

fig. 4 is a partial cross-sectional view of a heat sink fastening device according to an embodiment of the present invention;

fig. 5 is a schematic structural view of an L-shaped fastening inner pin according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a spring according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a hollow fastening push pin according to an embodiment of the present invention;

FIG. 8 is a cross-sectional view of a hollow fastening push pin according to an embodiment of the present invention;

fig. 9 is a schematic structural view of an L-shaped fastening inner pin according to a second embodiment of the present invention;

fig. 10 is a schematic structural diagram of a spring according to a second embodiment of the present invention;

fig. 11 is a schematic structural view of a hollow fastening push pin provided in the second embodiment of the present invention;

fig. 12 is a cross-sectional view of a hollow fastening push pin according to the second embodiment of the present invention.

In the figure:

100-a PCB board; 101-a first mounting hole; 200-a heat sink; 201-a second mounting hole; 202-a heat sink substrate; 203-radiating fins; 300-a heating element;

1-a fastening assembly;

11-hollow fastening push nails; 111-a staple head; 112-a nail pushing cylinder; 1121-annular boss; 1122-a circular receiving groove; 113-a limit groove; 114-a pilot hole; 115-fixation holes; 116-an in-column axial restraint portion; 117-column inner through groove; 118-axial column stop; 1181-a limit surface; 1182-a guide ramp;

12-L-shaped fastening inner pins; 121-pin cylinder; 122-a cross beam; 123-flat section; 124-external convex part;

13-a spring; 131-a spring body; 132-hook.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected" and "connected" are to be construed broadly, e.g., as being fixed or removable or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present invention, some orientation words are defined, and in the case where no opposite explanation is made, the used orientation words such as "upper", "lower", "rear", "left" and "right" mean that the heat sink fastening device provided by the present invention is defined in the normal use condition, and are consistent with the orientation or position relation shown in the drawings, and "inner" and "outer" mean the inner and outer relative to the outline of each part itself. These directional terms are merely for convenience of description and simplicity of operation, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting of the scope of the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Example one

The present embodiment provides a heat sink fastening device for fixing the heat sink 200 to the PCB 100 to dissipate heat of the heat generating component 300 on the PCB 100. As shown in fig. 1 to 4, the PCB 100 is provided with a heat generating element 300 and at least two first mounting holes 101. The heat sink 200 is located above the heat generating element 300, and is used for dissipating heat from the heat generating element 300. The heat sink 200 includes a heat sink base plate 202 and a plurality of heat dissipation fins 203 arranged on the heat sink base plate 202, at least one U-shaped groove and a plurality of transverse cutting grooves are formed between adjacent heat dissipation fins 203, at least two second mounting holes 201 are arranged on the heat sink 200, and the second mounting holes 201 are arranged in one-to-one correspondence with the first mounting holes 101. The heat sink 200 is a structure that is common in the prior art and will not be described herein.

The fastening device for the heat sink includes a fastening assembly 1, and the fastening assembly 1 fixes the heat sink 200 on the PCB 100. As shown in fig. 4, the fastening assembly 1 includes a hollow fastening push pin 11, an L-shaped fastening inner pin 12 and a spring 13, the L-shaped fastening inner pin 12 is clamped in the hollow fastening push pin 11 and can radially outwardly expand the hollow fastening push pin 11 along the hollow fastening push pin 11, so as to effectively prevent the hollow fastening push pin 11 from being deformed by retraction and being loosened and slid from the first mounting hole 101. The hollow fastening push nail 11 sequentially passes through the second mounting hole 201 and the first mounting hole 101, and the bottom of the hollow fastening push nail 11 is clamped on the lower surface of the PCB 100; the spring 13 includes a spring body 131 and a hook 132, the spring body 131 is disposed on the hollow fastening push pin 11 in a compressed manner and located between the hollow fastening push pin 11 and the heat sink 200, and the heat sink 200 is pushed by its own elastic force to be fixed on the PCB board 100, so as to achieve heat dissipation of the heat generating element 300 by the heat sink 200. The hook 132 of the spring presses the L-shaped fastening inner pin 12, preventing the L-shaped fastening inner pin 12 from slipping axially out of the hollow fastening push pin 11.

Specifically, as shown in fig. 5, the L-shaped fastening inner pin 12 includes a pin cylinder 121 and a beam 122, the beam 122 is disposed at the top end of the pin cylinder 121, the pin cylinder 121 is clamped in the hollow fastening push pin 11, the beam 122 is clamped at the top of the hollow fastening push pin 11, and the hook 132 of the spring presses the beam 122. Through the fastening mode that the pin cylinder 121 and the crossbeam 122 of the L-shaped fastening inner pin 12 are clamped and arranged, and the hook 132 of the spring is utilized to press the crossbeam 122 to clamp mutually, the assembling reliability of the fastening assembly is improved, the phenomenon that the L-shaped fastening inner pin 12 made of metal slips in the height direction to cause short circuit of the PCB 100 is effectively avoided, and the use safety is improved.

Further, as shown in fig. 6, the hook 132 is formed by outwardly bending the top coil of the spring body 131, and the hook 132 presses the beam 122. Preferably, the hook 132 is a multi-line bending structure, that is, the hook 132 is formed after the top coil of the spring body 131 is bent for multiple times, and the multi-line bending structure enables the tail end of the hook 132 to be located below the beam 122 and close to the top coil of the spring body 131, so that the problem that the hand is scratched by the tip of the tail end can be avoided, and the assembly safety is improved. In the present embodiment, the spring 13 is preferably a right-hand spring. Preferably, in the present embodiment, the hook 132 has a double-line bending structure.

In this embodiment, the pin cylinder 121 is provided with a flat portion 123 and an outer convex portion 124, the outer convex portion 124 is provided on both sides of the flat portion 123, and the outer convex portion 124 is arc-shaped. The arrangement of the structure improves the connection stability of the L-shaped fastening inner pin 12 and the hollow fastening push nail 11.

Specifically, as shown in fig. 7 and 8, the hollow fastening nail 11 includes a nail pushing head 111, a nail pushing column 112 and a column axial direction limiting portion 118 from top to bottom. Wherein, the nail pushing head 111 is provided with a U-shaped limiting groove 113, and the beam 122 is clamped in the limiting groove 113. The nail pushing cylinder 112 is connected to the lower surface of the nail pushing head 111, an annular boss 1121 is disposed at the upper portion of the nail pushing cylinder 112, an annular accommodating groove 1122 is formed between the nail pushing head 111 and the annular boss 1121, and the annular accommodating groove 1122 is used for accommodating the top coil of the spring body 131. This construction improves the stability of the connection of the spring 13, thereby ensuring that the fastening assembly 1 does not come loose during individual packaging and transportation.

The hollow fastening push pin 11 is provided with a guide hole 114 and a fixing hole 115 from top to bottom, and the guide hole 114 is communicated with the limiting groove 113. Preferably, the size of the guide hole 114 is larger than that of the fixing hole 115. In the present embodiment, the guide hole 114 and the fixing hole 115 are preferably circular holes, and the diameter of the guide hole 114 is larger than the diameter of the fixing hole 115. Of course, in other embodiments, the guiding hole 114 and the fixing hole 115 may also be oval, square, or the like. The diameter of the guide hole 114 is slightly larger than that of the pin cylinder 121, so that the installation and pushing of the pin cylinder 121 are facilitated. The diameter of the fixing hole 115 is theoretically the same as the diameter of the pin cylinder 121, so that axial friction is provided for fixing the L-shaped fastening inner pin 12, and the L-shaped fastening inner pin 12 is guaranteed not to slip after being assembled in place.

An axial column limiting portion 116 is provided in the fixing hole 115, and the fixing hole 115 is formed in a ring shape protruding inward to form the axial column limiting portion 116. This structure makes the L type fastening internal pin 12 assemble the back in place pin cylinder 121 outwards struts post internal axial spacing portion 116 to outwards strut the ejector pin cylinder 112 bottom, prevent it to take place the deformation of contracting inwards.

The lower part of the nail pushing cylinder 112 is provided with an inner cylinder through groove 117, the flat part 123 and the outer convex part 124 of the pin cylinder 121 are clamped in the inner cylinder through groove 117,

the bottom of the nail pushing cylinder 112 is provided with a cylinder axial limiting portion 118, and the cylinder axial limiting portion 118 passes through the first mounting hole 101 and is clamped on the lower surface of the PCB 100. The pin cylinder 121 of the L-shaped fastening inner pin 12 extends from the pin pushing head 111, sequentially passes through the guide hole 114 and the fixing hole 115, and then is pushed into the in-cylinder axial limiting portion 116, and presses the in-cylinder axial limiting portion 116 outward to outwardly expand the bottom end of the pin pushing cylinder 112, so as to prevent the cylinder axial limiting portion 118 from being deformed by inward contraction, thereby preventing the cylinder axial limiting portion 118 from slipping from the first mounting hole 101.

In this embodiment, as shown in fig. 7 and 8, the longitudinal section of the axial column-direction limiting portion 118 is generally V-shaped (tapered with a large top and a small bottom), and includes a generally horizontally arranged limiting surface 1181 and a guiding inclined surface 1182 located below the limiting surface 1181, the limiting surface 1181 abuts against the lower surface of the PCB 100, and the guiding inclined surface 1182 is a tapered structure with a large top and a small bottom. This structure has reduced the assembly resistance of hollow fastening nail 11 that pushes away, and the spacing portion 118 of cylinder axial of being convenient for from top to bottom passes second mounting hole 201 and first mounting hole 101 in proper order. Optionally, the axial column restraint 118 is a resilient structure.

The bottom of the hollow fastening push nail 11 in the embodiment is closed and does not branch, so that the integral rigidity of the hollow fastening push nail 11 is improved, the retraction amplitude is reduced, and the installation reliability is improved.

When the radiator fastening device is disassembled: pulling the hook 132 of the spring 13 from above and pulling out the L-shaped fastening inner pin 12; inserting a screwdriver into the fixing hole 115 at a proper height, shaking the hollow fastening push nail 11 back and forth in a direction perpendicular to the through groove 117 in the column, retracting and closing the column by utilizing the elastic deformation of the column axial limiting part 118, and separating the column axial limiting part 118 from the first mounting hole 101 of the PCB 100 by combining the upward thrust of the spring body 131; after the hollow fastening pins 11 are disengaged from the first mounting holes 101, the heat sink 200 is separated from the heat generating element 300.

It should be noted that the direction of the hollow fastening nail 11 can be flexibly selected according to the actual situation. In the embodiment, the space above the PCB 100 is sufficient, and the hollow fastening push pin 11 is assembled and disassembled in the area above the PCB 100, so that the operation below the PCB 100 is not needed, which is beneficial to the assembly operation. In other embodiments, when the given height above the PCB 100 and the height of the heat sink 200 are both smaller, so that the top of the hollow fastening push pin 11 is higher than the height of the heat dissipation fins 203, and the given height space below the PCB 100 is larger, the hollow fastening push pin 11 passes through the first mounting hole 101 from the bottom surface of the PCB 100, and then passes through the second mounting hole 201, and the column axial limiting portion 118 is clamped on the upper surface of the base plate of the heat sink 200, thereby completing the assembly.

Example two

The second embodiment provides a heat sink fastening device, and the main differences from the heat sink fastening device in the first embodiment include:

as shown in fig. 9, the pin cylinder 121 of the L-shaped fastening inner pin 12 in this embodiment is a straight cylindrical body. As shown in fig. 10, the spring 13 is a left-hand spring. As shown in fig. 11 and 12, the bottom of the hollow fastening push pin 11 is not closed, i.e. the through slot 117 in the column extends through the axial position-limiting part 118 of the column, the tail of the axial position-limiting part 118 of the column is horizontal, and the pin column 121 is clamped in the fixing hole 115.

It should be noted that, the hollow fastening push pins 11, the L-shaped fastening inner pins 12 and the springs 13 of different structures in the above embodiments can be used alternatively according to actual needs.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A radiator fastening device is characterized by comprising a fastening component (1) for fixing a radiator (200) on a PCB (100), wherein the fastening component (1) comprises a hollow fastening push nail (11), an L-shaped fastening inner pin (12) and a spring (13), and the L-shaped fastening inner pin (12) is clamped in the hollow fastening push nail (11) and can outwards prop open the hollow fastening push nail (11) along the radial direction of the hollow fastening push nail (11); the hollow fastening push nail (11) sequentially penetrates through a second mounting hole (201) in the radiator (200) and a first mounting hole (101) in the PCB (100), and the bottom of the hollow fastening push nail (11) is clamped on the lower surface of the PCB (100); the spring (13) comprises a spring body (131) and a hook (132), the spring body (131) is compressed and arranged on the hollow fastening push nail (11) and is positioned between the hollow fastening push nail (11) and the radiator (200), and the hook (132) presses the L-shaped fastening inner pin (12).

2. The radiator fastening device according to claim 1, wherein the L-shaped fastening inner pin (12) comprises a pin cylinder (121) and a cross beam (122), the cross beam (122) is arranged at the top end of the pin cylinder (121), the pin cylinder (121) is clamped in the hollow fastening push pin (11), the cross beam (122) is clamped at the top of the hollow fastening push pin (11), and the hook (132) presses the cross beam (122).

3. A heat sink fastening device according to claim 2, wherein the hook (132) is formed by outwardly bending a top coil of the spring body (131).

4. A heat sink fastening device according to claim 3, wherein the hook (132) is a multi-wire bent structure, and the end of the hook (132) is disposed below the cross beam (122) and close to the top coil of the spring body (131).

5. The radiator fastening device according to claim 2, wherein the pin cylinder (121) is provided with a flat portion (123) and an outward protrusion (124), the outward protrusion (124) is provided on both sides of the flat portion (123), and the outward protrusion (124) has an arc shape.

6. The radiator fastening device according to claim 5, wherein the hollow fastening push pin (11) comprises a push pin head (111) and a push pin column (112), the push pin head (111) is provided with a limiting groove (113), the cross beam (122) is clamped in the limiting groove (113), the push pin column (112) is connected to the lower surface of the push pin head (111), the hollow fastening push pin (11) is internally provided with a guide hole (114) and a fixing hole (115) from top to bottom, the fixing hole (115) is provided with an in-column axial limiting portion (116), the pin column (121) outwards props open the in-column axial limiting portion (116), the lower portion of the push pin column (112) is provided with an in-column through groove (117), and the flat portion (123) and the outward convex portion (124) are clamped in the in-column through groove (117), the bottom of the nail pushing cylinder (112) is provided with a cylinder axial limiting part (118), and the cylinder axial limiting part (118) penetrates through the first mounting hole (101) and is clamped on the lower surface of the PCB (100).

7. The heat sink fastening device according to claim 6, wherein the size of the guide hole (114) is larger than the size of the fixing hole (115).

8. The heat sink fastening device according to claim 6, wherein the axial column limiting portion (118) includes a limiting surface (1181) and a guiding inclined surface (1182) located below the limiting surface (1181), the limiting surface (1181) abuts against a lower surface of the PCB (100), and the guiding inclined surface (1182) is a tapered structure with a large top and a small bottom.

9. The heat sink fastening device according to claim 6, wherein the post axial restraint portion (118) is of a resilient construction.

10. The heat sink fastening device as claimed in claim 6, wherein an annular boss (1121) is disposed at an upper portion of the push pin cylinder (112), an annular accommodating groove (1122) is formed between the push pin head (111) and the annular boss (1121), and the annular accommodating groove (1122) is used for clamping a top coil of the spring body (131).

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