WO2023109948A1

WO2023109948A1 - Heat dissipation housing of remote radio unit, and remote radio unit

Info

Publication number: WO2023109948A1
Application number: PCT/CN2022/139597
Authority: WO
Inventors: 郭卫; 夏勇
Original assignee: 广东省新一代通信与网络创新研究院
Priority date: 2021-12-17
Filing date: 2022-12-16
Publication date: 2023-06-22
Also published as: CN216437764U

Abstract

The utility model provides a heat dissipation housing of a remote radio unit and the radio remote unit, and relates to the technical field of heat dissipation. The heat dissipation housing of the remote radio unit comprises a shell and heat dissipation teeth. The region of the outer surface of the shell corresponding to a digital circuit board part is a digital circuit board heat dissipation region, and the region of the outer surface of the shell corresponding to a power amplifier circuit board part is a power amplifier circuit board heat dissipation region. The heat dissipation teeth comprise straight heat dissipation teeth and special-shaped heat dissipation teeth. The heat dissipation area of the special-shaped heat dissipation teeth is larger than that of the straight heat dissipation teeth, the straight heat dissipation teeth are fixed in the digital circuit board heat dissipation region, and the special-shaped heat dissipation teeth are fixed in the power amplifier circuit board heat dissipation region. According to the utility model, the straight heat dissipation teeth in the power amplifier circuit board heat dissipation region on the outer surface of the shell are replaced with the special-shaped heat dissipation teeth, such that the heat dissipation area of the heat dissipation teeth in the power amplifier circuit board heat dissipation region is increased, and the problem that the product size is increased due to the fact that the height of straight heat dissipation teeth is increased in order to increase the heat dissipation area of an existing remote radio unit is solved.

Description

A radio frequency remote unit cooling shell and a radio remote unit

technical field

The utility model relates to the technical field of heat dissipation, in particular to a heat dissipation shell of a radio frequency remote unit and a radio frequency remote unit.

Background technique

The digital circuit board and power amplifier circuit board of traditional 4G RRU (Remote Radio Unit) equipment are usually divided into two single boards, which are respectively installed on both sides of the cooling case to help the two boards dissipate heat separately. The mutual influence of heat is relatively small. In order to provide sufficient design space for the filter to meet its performance parameters, the 5G RRU device usually makes the filter occupy an entire side space of the device alone, and combines the digital circuit board and the power amplifier circuit board into one single PCB, and the power amplifier circuit The board is usually located on the upper part of the digital circuit board device. In the vertical hanging installation scenario, the heat will continue to accumulate upwards, making the heat from the bottom to be severely baked on the top. Therefore, the RRU under the one-board PCB board structure faces more severe heat dissipation problems. . In order to solve the super high temperature rise at the top caused by the upward accumulation of heat inside the RRU heat dissipation cavity of this architecture, the usual method is to increase the heat dissipation area, and the increase of the heat dissipation area is mainly realized by increasing the height of the straight heat dissipation teeth (wherein , the RRU of the original straight cooling teeth is shown in Figure 1), which will undoubtedly lead to an increase in product volume.

Utility model content

Aiming at the deficiencies of the existing technology, the purpose of this utility model is to provide a radio frequency remote unit heat dissipation shell and a radio frequency remote unit, which is used to solve the problem of adding straight heat dissipation teeth in order to increase the heat dissipation area of the existing radio frequency remote unit The problem of product volume increase caused by height.

According to the first aspect of the present invention, a heat dissipation shell of a remote radio unit is provided, including a shell and heat dissipation teeth;

The interior of the housing is used to accommodate the PCB board, wherein the PCB board includes a digital circuit board part and a power amplifier circuit board part, the area on the outer surface of the housing corresponding to the digital circuit board part is the heat dissipation area of the digital circuit board, and the outer surface of the housing The area corresponding to the power amplifier circuit board is the heat dissipation area of the power amplifier circuit board;

The cooling teeth include straight cooling teeth and special-shaped cooling teeth. The cooling area of the special-shaped cooling teeth is larger than that of the straight cooling teeth. The straight cooling teeth are fixed on the cooling area of the digital circuit board, and the special-shaped cooling teeth are fixed on the cooling area of the power amplifier circuit board.

The heat dissipation shell of the radio frequency remote unit of the utility model replaces the straight heat dissipation teeth in the heat dissipation area of the power amplifier circuit board on the outer surface of the housing with special-shaped heat dissipation teeth, thereby increasing the heat dissipation area of the heat dissipation teeth in the heat dissipation area of the power amplifier circuit board, It solves the problem of increasing the volume of the product caused by increasing the height of the straight heat dissipation teeth in order to increase the heat dissipation area of the existing radio frequency remote unit.

In some embodiments, the straight cooling teeth and the special-shaped cooling teeth are arranged at intervals. As a result, the heat in the straight heat dissipation teeth and the special-shaped heat dissipation teeth can be dissipated in the space between them, which increases the overall heat dissipation performance; at the same time, the straight heat dissipation teeth and the special-shaped heat dissipation teeth are divided into two independent parts, Therefore, when the straight heat dissipation teeth and the special-shaped heat dissipation teeth are fixed on the outer surface of the casing, the straight heat dissipation teeth of different forms or sizes can be selectively matched with the special-shaped heat dissipation teeth of different forms or sizes.

In some embodiments, the housing protrusions are fixed on both sides in the length direction of the housing. Thus, the housing protrusions on both sides of the housing can protect the straight cooling teeth and special-shaped cooling teeth inside the housing protrusions.

In some embodiments, at least one of the protrusions of the housing is provided with a through hole and/or a through groove in the thickness direction, and the space between the straight cooling teeth and the special-shaped cooling teeth communicates with the through hole and/or the through groove. Thus, the heat in the space between the straight heat dissipation teeth and the special-shaped heat dissipation teeth can be guided to the outside of the outer surface of the housing through the through holes and/or through grooves.

In some embodiments, the special-shaped heat dissipation teeth include bow-shaped heat dissipation teeth, and/or tree branch-shaped heat dissipation teeth, and/or wave-shaped heat dissipation teeth. Therefore, the heat dissipation area of the heat dissipation teeth is increased by designing the special-shaped heat dissipation teeth into a bow shape, a tree branch shape or a wave shape.

In some embodiments, the tops of the straight heat dissipation teeth and the special-shaped heat dissipation teeth are flush. Thus, without increasing the volume of the product, the height of the special-shaped heat dissipation teeth can be kept to the maximum, that is, the heat dissipation area of the special-shaped heat dissipation teeth can be kept to the maximum.

In some embodiments, the straight heat dissipation teeth and/or the special-shaped heat dissipation teeth are perpendicular to the outer surface of the casing. Thus, it can be ensured that the heat in the straight cooling teeth and/or special-shaped cooling teeth is dissipated in the air as quickly as possible, and at the same time, as many straight cooling teeth and/or special-shaped cooling teeth can be fixed on the outer surface of the housing as possible. Cooling teeth.

In some embodiments, the length direction of the straight heat dissipation teeth and/or the special-shaped heat dissipation teeth is consistent with the length direction of the housing. Thus, it can be ensured that the gaps between the straight heat dissipation teeth are also consistent with the length direction of the housing, and the gaps between the special-shaped heat dissipation teeth are also consistent with the length direction of the housing, thereby increasing the heat dissipation performance.

In some embodiments, the central axis in the length direction of the straight heat dissipation teeth is aligned with the central axis in the length direction of the special-shaped heat dissipation teeth. Thus, it can be ensured that the straight heat dissipation teeth are aligned with the special-shaped heat dissipation teeth, so that the gaps between the straight heat dissipation teeth are aligned with the gaps between the special-shaped heat dissipation teeth, thereby increasing the heat dissipation performance.

According to a second aspect of the present invention, a remote radio unit is provided, and the remote radio unit includes the above-mentioned heat dissipation housing of the remote radio unit.

Compared with the prior art, the heat dissipation shell of the radio frequency remote unit and the radio frequency remote unit of the utility model replace the straight heat dissipation teeth of the heat dissipation area of the power amplifier circuit board on the outer surface of the housing with special-shaped heat dissipation teeth, thereby increasing the The heat dissipation area of the heat dissipation teeth in the heat dissipation area of the power amplifier circuit board solves the problem of increasing the product volume caused by increasing the height of the straight heat dissipation teeth in order to increase the heat dissipation area of the existing radio frequency remote unit.

Description of drawings

Figure 1 is the original radio frequency remote unit with straight cooling teeth;

Fig. 2 is an exploded view of the overall structure of the radio remote unit of the heat dissipation housing of the radio remote unit according to an embodiment of the present invention;

Fig. 3 is an exploded view of the overall structure of the heat dissipation shell of the radio frequency remote unit of the bow-shaped heat dissipation teeth according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of the outer surface of the heat dissipation shell of the radio frequency remote unit of the bow-shaped heat dissipation teeth according to an embodiment of the present invention;

Fig. 5 is an enlarged view of part A in Fig. 4;

Fig. 6 is an exploded view of the overall structure of the heat dissipation shell of the radio frequency remote unit of the branch-shaped heat dissipation tooth according to another embodiment of the present invention;

Fig. 7 is an enlarged view of part B in Fig. 6;

Fig. 8 is a simulation cloud diagram of the difference in heat dissipation effect of the straight heat dissipation teeth, the tree branch heat dissipation teeth and the bow-shaped heat dissipation teeth of the remote radio frequency unit.

Explanation of reference numerals: housing 100, digital circuit board heat dissipation area 110, power amplifier circuit board heat dissipation area 120, housing protrusion 130, through groove 140, heat dissipation teeth 200, straight heat dissipation teeth 210, special-shaped heat dissipation teeth 220, interval Space 230, PCB board 300, digital circuit board part 310, power amplifier circuit board part 320.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

2-5 schematically show the heat dissipation housing of the radio remote unit according to an embodiment of the present invention. As shown in Figures 2-5, the heat dissipation housing of the radio remote unit includes a housing 100 and heat dissipation teeth 200; wherein, the interior of the housing 100 is used to accommodate a PCB board 300, and the PCB board 300 includes a digital circuit board part 310 and a power amplifier The circuit board part 320, the area corresponding to the digital circuit board part 310 on the outer surface of the housing 100 is the digital circuit board heat dissipation area 110, and the area corresponding to the power amplifier circuit board part 320 on the outer surface of the housing 100 is the power amplifier circuit board heat dissipation area 120; Teeth 200 include straight heat dissipation teeth 210 and special-shaped heat dissipation teeth 220. The heat dissipation area of special-shaped heat dissipation teeth 220 is larger than that of straight heat dissipation teeth 210. In the heat dissipation area 120 of the power amplifier circuit board. By replacing the straight heat dissipation teeth of the power amplifier circuit board heat dissipation area 120 on the outer surface of the housing 100 with special-shaped heat dissipation teeth 210, thereby increasing the heat dissipation area of the heat dissipation teeth of the power amplifier circuit board heat dissipation area 120, and solving the existing radio frequency remote unit In order to increase the heat dissipation area and increase the height of the straight heat dissipation teeth, the problem of increasing the volume of the product is caused. Wherein, the straight heat dissipation teeth 210 and the special-shaped heat dissipation teeth 220 can also be fixed on the fixed plate first, and then the fixed plate and the housing 100 are fixed; For effective sealing and bonding, pre-embedded die-casting or post-friction stir welding can be used for bonding and fixing. Of course, the above-mentioned fixing methods are just examples, and the specific sealing and bonding forms or fixing methods are not limited here. It can be any direct The fixing method in which the shaped heat dissipation teeth 210 and the special-shaped heat dissipation teeth 220 are fixed on the housing 100 .

The special-shaped cooling teeth 220 are bow-shaped cooling teeth. Therefore, the heat dissipation area of the heat dissipation teeth is increased by designing the special-shaped heat dissipation teeth 220 in a bow shape.

The straight cooling teeth 210 and the special-shaped cooling teeth 220 are arranged at intervals. Thus, the heat in the straight heat dissipation teeth 210 and the special-shaped heat dissipation teeth 220 can be dissipated in the space 230 between them, which increases the overall heat dissipation performance; meanwhile, the straight heat dissipation teeth 210 and the special-shaped heat dissipation teeth 220 are divided into two parts It is an independent part, so that when the straight heat dissipation teeth 210 and the special-shaped heat dissipation teeth 220 are fixed on the outer surface of the housing, the straight heat dissipation teeth 210 of different forms or different sizes and the different forms or different sizes of the straight heat dissipation teeth 210 can be selectively used according to the needs Matching with special-shaped cooling teeth 220.

The tops of the straight cooling teeth 210 and the special-shaped cooling teeth 220 are flush with each other. Thus, without increasing the volume of the product, the height of the special-shaped cooling teeth 220 can be kept to the maximum, that is, the heat dissipation area of the special-shaped cooling teeth 220 can be kept to the maximum.

The straight cooling teeth 210 and/or the special-shaped cooling teeth 220 are perpendicular to the outer surface of the casing. Thus, it can be ensured that the heat in the straight cooling teeth 210 and/or the special-shaped cooling teeth 220 is dissipated in the air as quickly as possible, and at the same time, as many straight cooling teeth 210 as possible can be fixed on the outer surface of the housing 100 And/or special-shaped cooling teeth 220.

The length direction of the straight cooling teeth 210 and/or the special-shaped cooling teeth 220 is consistent with the length direction of the casing 100 . Thus, it can be ensured that the gap between the straight cooling teeth 210 is also consistent with the length direction of the housing 100 , and the gap between the special-shaped cooling teeth 220 is also consistent with the length direction of the housing 100 , thereby increasing the heat dissipation performance.

The central axis in the length direction of the straight cooling tooth 210 is aligned with the central axis in the length direction of the special-shaped cooling tooth 220 . Thus, it can be ensured that the straight heat dissipation teeth 210 are aligned with the special-shaped heat dissipation teeth 220 , so that the gaps between the straight heat dissipation teeth 210 and the special-shaped heat dissipation teeth 220 are aligned to increase the heat dissipation performance.

Housing protrusions 130 are fixed on both sides in the length direction of the housing 100 . Thus, the housing protrusions 130 on both sides of the housing 100 can protect the straight cooling teeth 210 and the special-shaped cooling teeth 220 inside the housing protrusions 130 .

At least one casing protrusion 130 is provided with a through groove 140 in the thickness direction, and the space between the straight cooling teeth 210 and the special-shaped cooling teeth 220 communicates with the through groove 140. Thus, the heat in the space 230 between the straight heat dissipation teeth 210 and the special-shaped heat dissipation teeth 220 can be guided to the outside of the outer surface of the casing 100 through the through slots 140 .

In other embodiments, as shown in FIG. 6 and FIG. 7 , the special-shaped cooling teeth 220 are branch-shaped cooling teeth. Therefore, the heat dissipation area of the heat dissipation teeth is increased by designing the special-shaped heat dissipation teeth 220 in the shape of a tree branch.

In other embodiments, the special-shaped cooling teeth 220 are wave-shaped cooling teeth. Therefore, the heat dissipation area of the heat dissipation teeth is increased by designing the special-shaped heat dissipation teeth 220 in a wave shape.

In other embodiments, at least one of the shell protrusions 130 is provided with a through hole in the thickness direction, and the space between the straight cooling teeth 210 and the special-shaped cooling teeth 220 communicates with the through hole. Thus, the heat in the space 230 between the straight heat dissipation teeth 210 and the special-shaped heat dissipation teeth 220 can be directed to the outside of the outer surface of the casing 100 through the through holes.

The tooth shape design of the special-shaped heat dissipation teeth can continue to increase the heat dissipation area of the tooth surface within the original height range, so as to increase the cooling effect of the top of the shell. After calculation, taking the heat dissipation teeth with a tooth height of 70mm and a tooth thickness of 2mm shown in this example as an example, within the height limit range, the effective heat dissipation surface area of a single tooth of a tree branch heat dissipation tooth is 20% larger than that of the original straight heat dissipation tooth. The effective heat dissipation surface area of a single tooth of the zigzag heat dissipation tooth is increased by 40% compared with the original straight heat dissipation tooth, as shown in Table 1 below.

Table 1 is a comparison of the effective heat dissipation surface area of a single tooth with different tooth shapes

In order to verify the effect of the scheme, the simulation compares the difference in the heat dissipation effect of RRU adopting straight heat dissipation teeth, tree branch heat dissipation teeth and bow-shaped heat dissipation teeth. The key chip simulation data is shown in Table 2 below, and the simulation cloud diagram is shown in Figure 8.

Table 2 shows the simulation temperature comparison of key chips of RRU power amplifiers with different tooth cooling schemes

It can be seen from the simulation data that the temperature of the top power amplifier of the RRU using the tree-branch-shaped heat sink (die-casting radiator embedded with tree-shaped profile tooth radiator) and the bow-shaped heat sink (die-casting radiator embedded with bow-shaped profile tooth radiator) on the top of the shell is relatively high. The shells of the original straight cooling teeth (pure die-casting straight tooth radiator) have obvious temperature drop (about 3-5°C). From the above analysis, it can be seen that the special-shaped heat dissipation tooth scheme effectively improves the heat accumulation in the power amplifier area on the top of the PCB integrated RRU, so that the temperature of the key chip of the power amplifier has a significant cooling effect of 3-5 °C.

What have been described above are only some embodiments of the present utility model. For those skilled in the art, without departing from the inventive concept of the present utility model, some modifications and improvements can be made, and these all belong to the protection scope of the present utility model.

Claims

A radio frequency remote unit cooling case, characterized in that it comprises:

The housing, the interior of the housing is used to accommodate the PCB board, wherein the PCB board includes a digital circuit board part and a power amplifier circuit board part, and the area of the outer surface of the housing corresponding to the digital circuit board part is The heat dissipation area of the digital circuit board, the area of the outer surface of the housing corresponding to the part of the power amplifier circuit board is the heat dissipation area of the power amplifier circuit board;

Heat dissipation teeth, the heat dissipation teeth include straight heat dissipation teeth and special-shaped heat dissipation teeth, the heat dissipation area of the special-shaped heat dissipation teeth is larger than that of the straight heat dissipation teeth, and the straight heat dissipation teeth are fixed on the digital circuit board for heat dissipation area, the special-shaped heat dissipation teeth are fixed on the heat dissipation area of the power amplifier circuit board.
The heat dissipation housing of the radio remote unit according to claim 1, wherein the straight heat dissipation teeth and the special-shaped heat dissipation teeth are arranged at intervals.
The heat dissipation housing of the radio remote unit according to claim 2, characterized in that, housing protrusions are fixed on both sides in the length direction of the housing.
The heat dissipation housing of the remote radio frequency unit according to claim 3, wherein at least one of the protrusions of the housing is provided with a through hole and/or a through groove in the thickness direction, and the straight heat dissipation teeth, the The space between the special-shaped cooling teeth communicates with the through hole and/or the through groove.
The heat dissipation housing of the remote radio unit according to any one of claims 1-4, wherein the special-shaped heat dissipation teeth include bow-shaped heat dissipation teeth, and/or tree branch-shaped heat dissipation teeth, and/or wave-shaped heat dissipation teeth .
The heat dissipation housing of the radio remote unit according to any one of claims 1-4, characterized in that the tops of the straight heat dissipation teeth and the special-shaped heat dissipation teeth are flush with each other.
The heat dissipation housing of the remote radio unit according to any one of claims 1-4, wherein the straight heat dissipation teeth and/or the special-shaped heat dissipation teeth are perpendicular to the outer surface of the housing.
The heat dissipation housing of the remote radio unit according to any one of claims 1-4, wherein the length direction of the straight heat dissipation teeth and/or the special-shaped heat dissipation teeth is consistent with the length direction of the housing.
The heat dissipation housing of the radio remote unit according to any one of claims 1-4, wherein the central axis in the length direction of the straight heat dissipation teeth is aligned with the central axis in the length direction of the special-shaped heat dissipation teeth .
A remote radio unit, characterized by comprising the heat dissipation shell of the remote radio unit according to any one of claims 1-9.