CN2718736Y

CN2718736Y - A shielding apparatus

Info

Publication number: CN2718736Y
Application number: CN 200420042394
Authority: CN
Inventors: 鲁勇; 冯凯; 李宝军
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2004-03-31
Filing date: 2004-03-31
Publication date: 2005-08-17
Anticipated expiration: 2014-03-31

Abstract

The utility model provides a shielding apparatus to solve the problem that the shielding apparatus in an existing technique can't effectively avoid the generation of EMC while in bigger equipment power dissipation, thicker cable or higher equipment frequency. The shielding apparatus comprises a frame base (10), a hole for crossing threads (101) on the frame base (10), an arrester (20) disposed on the frame base (10), a shielding cover body disposed on the arrester (20) and covering the arrester (20) and the hole for crossing threads in it, a microwave filter (40) with an output terminal (401) and an input terminal (402), a sealing block (60) for sealing an AC cable via hole (301) passing through the hole for crossing threads (101) and a shielding bar (50) fixed in the gap formed between the microwave filter (40) and the shielding cover body. Therein, the input terminal (402) can pass through the side wall of the shielding cover body and be connected with the cable of the frame via the via hole (301).

Description

A kind of shield assembly

Technical field

The utility model relates to the plant equipment of the communications field, specifically refers to a kind of shield assembly.

Background technology

At current wireless communication field, used a large amount of outdoor base stations, because of outdoor base station does not need machine room, so the operator also more and more relies on outdoor base station to realize wide the covering fast, to reduce the networking cost.But because outdoor base station generally adopts Alternating Current Power Supply, so, also to carry out filtering and shielding processing to AC power cord exchanging the incoming line place nearby except the thunder-strike current of should lightning protection device in parallel releasing.

Please refer to Fig. 1, structural representation for shield assembly in the prior art, its ultimate principle is: rely on and shorten the purpose that conductor length reaches shielding, specifically be: after the interchange inlet wire 1 of Cabinet enters rack from rack bottom 2, radome of wave filter 3 usefulness is built, the input end 31 that makes wave filter 3 and output terminal 32 and then rely on the length that shortens the shielding cavity inside conductor to realize electromagnetic screen in same shield 5.Described device also comprises a lightning arrester 4 and a seal modules 6.

Please refer to Fig. 2, though being placed on the input end 31 of wave filter 3 in the shield 5 with output terminal 32, above-mentioned shield assembly can guarantee wave filter 3 shell good earths, but can't stop the mutual coupling of input end 31 and output terminal 32, and then can finally cause external disturbance to enter rack inside, and the high-frequency signal of rack inside conducted, become the interference source of outside miscellaneous equipment.

As seen, shield assembly of the prior art reaches relevant criterion in order to make rack EMC, have only conductor length a and b (shown in Figure 1) to control enough for a short time with wave filter input and output terminal, just can reach effective shielding, this scheme generally can realize when less and installation electromagnetical frequency is low at equipment power dissipation; But when equipment power dissipation bigger, when the thick or device frequency of cable is higher, because reasons such as operation are difficult to control the cable length at two ends very short, and then occur the EMC problem inevitably.

Technology contents

The utility model provides a kind of shield assembly, and shield assembly can not be bigger at equipment power dissipation in the prior art to solve, the problem of avoiding EMC to produce effectively when the thick or device frequency of cable is higher.

For this reason, the utility model provides following technical scheme:

A kind of shield assembly comprises: rack base plate (10), threading hole (101), its be opened in anti-(10) at the bottom of the described rack on; Lightning arrester (20), described lightning arrester (20) are placed on the described rack base plate (10); The shielding cover body, described shielding cover body places on the described lightning arrester (20), and lightning arrester (20) and threading hole (101) are covered in wherein; Wave filter (40), described wave filter (40) have output terminal (401) and input end (402); Sealing block (60), act as and seal the interchange cable that is arranged in the threading hole (101), described shield assembly also comprises: via hole (301), and described input end (402) can be connected by the cable that described via hole (301) passes in described radome body sidewall and the rack; Shielding strip (50) fixedly is fastened in the slit that forms between described wave filter (40) and shielding cover body.

Described shielding cover body is a radome (30).

Described via hole (301), described input end (402) can be connected by the cable that described via hole (301) passes in described radome (30) sidewall and the rack.

Described shielding cover body is made up of the first shielding cover body (30), secondary shielding cover body (100) and the 3rd shielding cover body (80).

Described shield assembly also comprises: web member (90) can link together described secondary shielding cover (100) and the 3rd radome (80) by described web member (90).

Described web member (90) is specially: trip bolt.

After taking this scheme, the utlity model has following advantage:

1, owing to having isolated the input end and the output terminal of wave filter fully, so thoroughly eliminated electromagnetic coupled between rack internal unit and outside input cable;

2, the utility model compared with prior art, has compact conformation, it is little to take up room, more and more littler at cabinet dimensions, has very important realistic meaning under the more and more nervous situation in inner space, particularly under the less situation of rack horizontal space, the shield assembly advantage of the utility model second embodiment is more obvious;

3, the utility model first embodiment with compared with prior art, use a radome less, saved cost.

Description of drawings

Fig. 1 is the structural representation of shield assembly in the prior art;

Fig. 2 is a undesired signal communication process schematic diagram in the prior art;

Fig. 3 is the first example structure synoptic diagram and the shielding principle figure of the utility model shield assembly;

Fig. 4 is the second example structure synoptic diagram of the utility model shield assembly.

Embodiment

Please refer to Fig. 3, be the first example structure synoptic diagram and the shielding principle figure of the utility model shield assembly, described shield assembly comprises: rack base plate 10, threading hole 101, and it is opened on the described rack base plate 10; Lightning arrester 20, described lightning arrester 20 is placed on the described rack base plate 10, plays the lightning protection effect; Radome 30, described radome 30 places on the described lightning arrester 20, and lightning arrester 20 is covered in wherein, and in addition, described threading hole 101 also is enclosed in the radome 30, via hole 301, it is opened on the sidewall of radome 30; Wave filter 40, described wave filter 40 has output terminal 401 and input end 402, and described input end 402 can pass described radome 30 sidewalls by described via hole 301 and be connected with cable in the rack; Shielding strip 50 can conduct electricity, and it fixedly is fastened in the slit of described

wave filter

40 and 30 formation of radome, plays shielding action; Sealing block 60 act as and seals the interchange cable 70 that is arranged in the threading hole 101.In addition, described rack base plate 10 and radome 30 ground connection all.

Shielding principle of the present utility model is: after the external communication cable enters rack, with radome 30 wave filter 40 input ends 402 and lightning arrester 20 are come with rack internal unit (figure does not show) shielding, wave filter 40 enters radome 30 inside by the via hole 301 of radome 30, finish wiring, because the shielding strip 50 of conduction is arranged in the slit of

wave filter

40 and 30 formation of radome, so internal interference signals is just directly released to earth point by betal can, so just the input end 402 of wave filter 40 is kept apart fully with output terminal 401, also the input end 402 and the rack internal unit of wave filter 40 are isolated fully, avoided wave filter 40 input ends 402 and output terminal 401 to produce coupling; Simultaneously, external interference signals is also released to earth point along radome 30 sidewalls when entering rack arrival wave filter 40 input ends 402 by the interchange cable, avoids the interference to the rack internal unit.

Please refer to Fig. 4, be the second example structure synoptic diagram of the utility model shield assembly, described shield assembly comprises: rack base plate 10, threading hole 101, its be opened at the bottom of the described rack anti-10 on; Lightning arrester 20, described lightning arrester 20 is placed on the described rack base plate 10, plays the lightning protection effect; First radome 30, described first radome 30 places on the described lightning arrester 20, and lightning arrester 20 is covered in wherein, and in addition, described threading hole 101 also is enclosed in first radome 30, through hole 302, it is opened on the sidewall of first radome 30; Wave filter 40, described wave filter 40 has output terminal and input end; Secondary shielding cover 100 offers mounting hole 101 on the one sidewall, by cooperating of described input end 402 and mounting hole 101 described wave filter 40 being fixed on described secondary shielding cover 100 sidewalls and described wave filter 40 being covered among the secondary shielding cover 100; The 3rd radome 80 covers in described input end wherein; Shielding strip 50 fixedly is fastened in the slit of described

wave filter

40 and 30 formation of first radome respectively, in the slit of described

first radome

30 and 100 formation of described secondary shielding cover, in the slit that forms of described first radome 30 and described the 3rd radome 80; Web member 90 can link together described secondary shielding cover 100 and the 3rd radome 80 by described web member 90, and described web member 90 specifically can be: trip bolt.

As seen the shield assembly among second embodiment is particularly suitable for the space condition of limited of rack horizontal direction, its cardinal principle is to utilize a plurality of radomes to be combined into the shielding space that radome among first embodiment forms by shielding strip, effectively utilizes the space of rack short transverse to exchange the space of rack horizontal direction for.

After taking this scheme, the utlity model has following advantage:

1, owing to isolated input and the output of wave filter fully, establishes so thoroughly eliminated interior of equipment cabinet Electromagnetic coupled between standby and outside input cable;

2, the utility model compared with prior art has compact conformation, and it is little to take up room, at cabinet dimensions More and more littler, have very important realistic meaning in the more and more nervous situation in inner space, particularly exist In the littler situation of rack horizontal space, the screening arrangement advantage of the utility model second embodiment is more obvious;

3, the utility model first embodiment compared with prior art uses a radome less, has saved cost.

Claims

1, a kind of shield assembly comprises: rack base plate (10), threading hole (101), its be opened in anti-(10) at the bottom of the described rack on; Lightning arrester (20), described lightning arrester (20) are placed on the described rack base plate (10); The shielding cover body, described shielding cover body places on the described lightning arrester (20), and lightning arrester (20) and threading hole (101) are covered in wherein; Wave filter (40), described wave filter (40) have output terminal (401) and input end (402); Sealing block (60), act as and seal the interchange cable that is arranged in the threading hole (101), it is characterized in that described shield assembly also comprises: via hole (301), described input end (402) can be connected by the cable that described via hole (301) passes in described radome body sidewall and the rack; Shielding strip (50) fixedly is fastened in the slit that forms between described wave filter (40) and shielding cover body.

2, shield assembly as claimed in claim 1 is characterized in that, described shielding cover body is a radome (30).

3, shield assembly as claimed in claim 1 is characterized in that, described shielding cover body is made up of the first shielding cover body (30), secondary shielding cover body (100) and the 3rd shielding cover body (80).

4, shield assembly as claimed in claim 3 is characterized in that, described shield assembly also comprises: web member (90) can link together described secondary shielding cover (100) and the 3rd radome (80) by described web member (90).

5, shield assembly as claimed in claim 4 is characterized in that, described web member (90) is specially: trip bolt.