CN201213344Y - Fixtures for heat sinks on sub-printed circuit boards - Google Patents

Abstract

The utility model discloses a fixing device for a radiator of a printed circuit board, which comprises at least two fixing units, and each fixing unit includes: a stud, which runs through the radiator; on the studs to hold the heat sink to the studs. Wherein, one end of the stud is the connection end of the child printed circuit board, and the other end is the connection end of the female printed circuit board. The utility model can not only fix the sub-PCB and the heat sink, but also can fix the sub-PCB and the mother PCB, so that the original two kinds of mounting studs on the sub-PCB are combined into one, and the number of parts and mounting holes is reduced. , so that the utilization rate of the layout space on the sub-PCB is greatly improved, and the assembly efficiency can be improved and the assembly cost can be reduced.

Description

Fixtures for heat sinks on sub-printed circuit boards

technical field

The utility model relates to the technical fields of communication and electronics, and more particularly relates to a fixing device for a heat sink of a printed circuit board.

Background technique

Printed Circuit Board (PCB for short) is widely used. At present, in communication and electronic equipment, there is a structural relationship between the child PCB and the mother PCB to realize the expansion of the mother PCB and the expansion of functions. The existing installation structure uses studs in the middle of the child PCB and the mother PCB (the mother PCB and the mother PCB The distance between the sub-PCBs is a fixed distance h), which are respectively fixed with screws on both sides of the sub-PCB and the mother PCB. If there is a heat sink on the sub-PCB, especially when the area of the heat sink is large, it is necessary to easily remove the sub-PCB and the heat sink for maintenance. The existing technical solution is that the fixing screws of the sub-PCB and the mother PCB (as shown in Figure 1) and the fixing screws of the sub-PCB and the radiator (as shown in Figure 2) are not in the same position. The disadvantage of this technical solution is that the screw mounting holes on the sub-PCB There are many, and the mounting holes need to be staggered from each other, which takes up a lot of space, affects the wiring and device layout of the sub-PCB, and also affects the assembly efficiency.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a fixing device for a printed circuit board radiator, which has a compact structure, convenient maintenance and high reliability.

In order to achieve this purpose, the utility model provides a fixing device for a printed circuit board heat sink, which includes at least two fixing units, each fixing unit includes: a stud, which runs through the heat sink; On the studs on both sides of the heat sink to keep the heat sink and the studs together, wherein one end of the studs is the connection end of the sub PCB, and the other end is the connection end of the mother PCB.

Preferably, the female PCB connection end of the above-mentioned stud forms a stopper step, one end of the spring abuts against the stopper step, and the other end is biased toward the radiator.

Preferably, the connection end of the sub-PCB of the above-mentioned stud forms an expandable riveting part, and the gasket is riveted to the riveting part. Optionally, the washer is screwed onto the stud, or the washer is welded to said stud.

Preferably, the distance between the connection end of the mother PCB and the connection end of the sub-PCB is equal to the installation distance of the connector between the sub-PCB and the mother PCB.

The spring in the utility model plays a role in making the pressure of the radiator on the chip float after the radiator is installed on the sub-PCB, so as to ensure reliable contact between the radiator and the surface of the chip through the heat conduction pad or heat conduction silicone grease.

After the radiator in the utility model is assembled, the radiator is first pressed on the sub-PCB chip and fixed with the sub-PCB with screws, then the sub-PCB with the radiator installed is inserted into the mother PCB, and the sub-PCB and the sub-PCB are fixed with screws. The mother PCB is fixed and the assembly is complete.

The structure of the utility model is suitable for sub-PCB structures with radiators or other similar structures in communication and electronic equipment.

The beneficial effects of the utility model are: according to the fixing device of the sub-PCB radiator of the utility model, it can not only realize the fixation of the sub-PCB and the radiator on the chip, but also solve the problem of fixing between the sub-PCB and the mother PCB, effectively The two types of mounting studs on the sub-PCB are combined into one, so that the layout space utilization rate on the sub-PCB is greatly improved, the assembly efficiency is higher, the reliability is higher, and the cost is lower.

It should be noted that both the above description and the following detailed description are exemplary and are intended to provide further explanation of the claimed invention.

In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. Other purposes, features and effects of the present utility model will be further described in detail with reference to the drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, and are used to explain the utility model together with the embodiments of the utility model, and do not constitute a limitation to the utility model. In the attached picture:

FIG. 1 is a schematic diagram of installation of a sub PCB and a mother PCB according to the prior art;

FIG. 2 is a schematic diagram of conventional mounting studs for a heat sink and a PCB according to the prior art;

Fig. 3a is a schematic structural view of a fixing device for a sub-PCB radiator according to a preferred embodiment of the present invention;

Fig. 3b shows a schematic diagram of the installation of the sub-PCB and the mother PCB, wherein the sub-PCB and the mother PCB are installed together through the fixing device shown in Fig. 3a.

Detailed ways

The fixing device of the sub-PCB radiator of the present invention will be described in detail below in conjunction with the accompanying drawings.

FIG. 1 is a schematic diagram of the existing sub PCB and mother PCB installation. As shown in FIG. 1 , the mother PCB 11 and the child PCB 12 are connected through a conventional stud 13 in the middle, and then fixed with screws 14 on both sides of the child PCB and the mother PCB respectively.

FIG. 2 is a schematic diagram of conventional mounting studs between a conventional radiator and a PCB. According to Fig. 2, the stud 21 is inserted into the radiator 24 from the back of the radiator 24, then the spring 22 is inserted, and then screwed into the stud 21 with the screw 23, so that the stud 21 and the radiator 24 are fixed together. Then the heat sink 24 is pressed on the surface of the chip 26 that needs heat dissipation on the PCB25, and then screwed into the stud 21 through the PCB25 with a screw 23 from the reverse side of the PCB25 to complete the fixing of the heat sink and the PCB.

Fig. 3a is a structural schematic diagram of a fixing device for a sub-PCB radiator in a preferred embodiment of the present invention. After inserting the stud 39 into the spring 38 according to Figure 3, insert it into the radiator 36 from the front of the radiator 36, then insert the pad cover 37 into the head of the stud 39, and finally expand the stud 39 with a special riveting tool. The head of the head reaches the riveting with the pad cover 37. Note that the end surface is flat after riveting. The stud 39 is an internal full-length thread. Screws can be installed from both ends of the stud. After riveting, the height of the stud is a fixed distance h, which is exactly The height to be maintained after the PCB is inserted into the mother PCB.

Fig. 3b shows a schematic diagram of the installation of the sub-PCB and the mother PCB, wherein the sub-PCB and the mother PCB are installed together through the fixing device shown in Fig. 3a. Press the heat sink 36 with the stud 39 fixed on the surface of the chip 32 that needs to be dissipated on the sub-PCB 31. Before installation, the surface of the chip 32 should be pasted with a heat-conducting pad or coated with heat-conducting silicone grease, and then the sub-PCB 31 and the heat sink 36 are fixed with screws 33. Then insert the sub-PCB31 with the heat sink 36 installed into the corresponding connector socket 34 on the mother PCB35, and fix the sub-PCB31 and the mother PCB35 with screws to complete the assembly.

The fastening device as described above can be used on various electronic and communication equipment.

Compared with the prior art, the fixing device of the sub-PCB heat sink of the utility model solves the problem that the sub-PCB must be fixed with the heat sink and with the mother PCB through the two-in-one stud.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (5)

1. the fixture of a seed printed wiring board radiator is characterized in that, comprises at least two fixed cells, and each described fixed cell comprises:

Double-screw bolt runs through described radiator; And

Spring and cushion cover divide on the described double-screw bolt of the both sides be located at described radiator, so that described radiator and described double-screw bolt are kept together,

Wherein, described double-screw bolt one end is sub-printed wiring board link, and the other end is female printed wiring board link.

2. fixture according to claim 1 is characterized in that,

Female printed wiring board link of described double-screw bolt forms the backstop step, and an end of described spring is against described backstop step, and the other end is to described radiator bias voltage.

3. fixture according to claim 2 is characterized in that,

The sub-printed wiring board link of described double-screw bolt forms expanding riveting part, and described cushion cover is riveted on described riveting part.

4. fixture according to claim 2 is characterized in that,

Described cushion cover is spirally connected or is welded on the described double-screw bolt.

5. according to each described fixture in the claim 1 to 4, it is characterized in that,

Distance between described female printed wiring board link and the described sub-printed wiring board link equals the mounting distance of the connector between described sub-printed wiring board and the described female printed wiring board.

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