CN2538121Y - Shield casing - Google Patents

Abstract

The utility model relates to a shielding shell of a cabinet or a chassis, wherein a window for letting shielded cables pass through is opened on the shell, and at least two metal clamping lines arranged in parallel according to a predetermined distance are arranged in the window; The cross-section of the clamping line is an "I"-shaped structure, and conductive pads are symmetrically installed on both sides, and the conductive pads on two adjacent clamping lines are squeezed into contact with each other; The braided shielding layer and the conductive liner on the clamping line are pressed against each other to maintain good electrical contact. After the assembly is completed, the braided shielding layer, conductive gasket, clamping line and shielding shell of the shielded cable form an electrically continuous whole, which meets the shielding requirements and the grounding requirements of the shielded cable shielding layer.

Description

a shielding case

technical field

The utility model relates to the electromagnetic shielding technology of transmission, communication and other equipment, more specifically, relates to the improvement of the structure of the shielding shell of the cabinet or the chassis, so as to ensure the shielding effect when the shielding cable passes through the shielding shell.

Background technique

In electronic products, it is usually necessary to pass through the shielded cable from the device. If the shielding layer of the shielded cable cannot be well connected with the casing when passing through the shielded casing, the electromagnetic waves inside the product will radiate twice through the cable; in addition, The opening at the outlet usually reduces the shielding performance of the housing, causing the electromagnetic radiation of the product to exceed the standard limit requirements. Therefore, there is a need for a shielded cable clamping device, which can achieve a good overlap between the shielding layer of the shielded cable and the housing without reducing the shielding performance of the housing.

As shown in Figure 1 and Figure 2, the existing shielded cable clamping device consists of a conductive gasket 11 with a large amount of compression folded in half and stuck in the middle of two installation profile strips 12, and the installation profile strip 12 is riveted to the shielding shell of the equipment On, the cover plate 13 on the right side of the profile bar 12 is installed, and a threading hole is also provided below. When installing the cable, first pass the shielded cable 5 through the threading hole, then slide it to the left between the conductive pads, so that the cable shielding layer and the conductive pad are well conductively connected, and finally cover the opening with a metal cover plate 13 superior.

This kind of shielding structure has many assembly procedures and poor operability. It is necessary to rivet and fix the installation profile strips on the shielding shell first, and then clamp the conductive gasket between the profile strips, and after the cables of the equipment are fully assembled, It is also necessary to fasten the wiring hole cover with screws, otherwise it will affect the shielding effectiveness of the equipment casing. If you want to replace the assembled cable, you need to remove all the cables in front of the cable. And in the process of assembly, the shielding layer of the cable is easy to scratch the conductive part of the conductive pad, reducing the electrical connection performance between the cable shielding layer and the metal casing of the device.

Utility model content

The technical problem to be solved by the utility model is to improve the shielding structure between the cable and the shielding shell of the cabinet or the chassis in view of the above-mentioned defects of the existing shielded cable clamping device, so that the shielding structure between the shielded cable and the shielding shell The structure is more effective, and the operation and maintenance are more convenient.

The utility model can be realized through the following technical solutions. A window for letting the shielded cable pass through is opened on the shielding shell, and at least two metal clip lines arranged in parallel at a predetermined distance are arranged in the window; the clip The cross-section of the line is an "I"-shaped structure, and conductive pads are symmetrically installed on both sides of the line, and the conductive pads on the two adjacent lines are extruded and contacted with each other. When assembling, the shielded cable passes between two adjacent clamping lines, and its braided shielding layer and the conductive gasket on the clamping lines are squeezed against each other to maintain good electrical contact.

In the present utility model, the window is rectangular, and the two ends of the clamping lines are fixed on the housings on the upper, lower or left and right sides of the rectangular window.

In the present utility model, the window is rectangular, and the two ends of the clamping lines are fixed on the housings on the upper, lower or left and right sides of the rectangular window.

In the utility model, the length of the base of the "I"-shaped clamping line is less than the width of the window in the installation direction of the clamping line, the length of the top plate is greater than the width of the window in the installation direction of the clamping line, and the base of the clamping line is installed inwardly into the window of the housing , the top plate is pressed against the panels on both sides of the window. At the same time, between the top plate at one end of the "I"-shaped clamping line and the vertical part in the middle, there is a card slot for the housing panel to be inserted, and a screw hole is also provided on the top plate at the other end; the rectangular window The top, bottom or left and right sides are provided with positioning grooves that match the two ends of the middle vertical part of the "I"-shaped clip line, and one side is also provided with a shell screw hole corresponding to the top plate screw hole. During assembly, the clamping groove at one end of the "I"-shaped clamping line clamps the housing panel, the middle vertical parts of both ends are inserted into the positioning grooves on both sides of the window, and the screw holes on the top plate and the two sides of the window are connected by screws. The shell screw holes are fixedly connected.

With the implementation of the utility model, the metal braided shielding layer of the shielded cable passing through the shielding shell can form an electrically continuous whole with the conductive liner, the clamping line and the shielding shell, and at the same time meet the shielding requirements and the grounding requirements of the shielding layer of the shielded cable.

The utility model will be further described below in conjunction with accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a schematic diagram of the shielding structure when the shielded cable passes through the shielding shell in the prior art;

Fig. 2 is A-A sectional view of Fig. 1;

Fig. 3 is a three-dimensional schematic diagram when the clamping line in the utility model is loaded with a conductive pad;

Figure 4 is a cross-sectional view of Figure 3;

Fig. 5 is a three-dimensional schematic view when looking at the clamping lines in the utility model from the other end;

Fig. 6 is a schematic diagram of a window opened on the shielding case;

Fig. 7 is a schematic diagram of the shielded cable passing through the shielded casing in the present invention;

Fig. 8 is a three-dimensional schematic diagram of the shielding case in the present invention.

Detailed ways

A preferred embodiment of the present utility model is shown in Fig. 7 and Fig. 8, as can be seen from the figure, in this embodiment, it is composed of shielding shell 2, clip bar 3, conductive gasket 4, fastening screw 6 and other parts With a good shielding structure, the metal braided shielding layer of the shielded cable 5 passing through the shielding shell can form an electrically continuous whole with the above-mentioned parts, thereby realizing the shielding function.

Wherein the structure of the clamping line 3 is shown in Figures 3, 4 and 5, and can be made of metal materials with good electrical conductivity, such as made of aluminum alloy profiles. It can be seen from the figure that the main body of the clamping line 3 is a section of "I"-shaped profile, and the two wings of the top plate and the two wings of the base are used to control the boundary of the conductive gasket 4, prevent it from spreading upwards and downwards, and prevent it from falling off. . At both ends of the clamping line 3, the top plate is longer than the base, and one end of the clamping line is provided with a draw-in groove 33 allowing the housing panel to snap in, and the other end has a positioning boss 32 and a screw hole 31.

As can be seen from Figures 3, 4, and 5, the cross-section of the strip-shaped conductive pad 4 in this embodiment is semicircular, and its width is equal to the height of the "I"-shaped clip line. When assembling, the conductive pad passes through The double-sided tape is symmetrically glued to the left and right sides of the clip line 3. The conductive gasket in this embodiment can be made by wrapping a layer of silver-plated nylon mesh outside the foam inner core.

The window for passing through the shielded cable provided on the shielding shell 2 is shown in Figure 6. A row of substantially symmetrical positioning grooves 22 are respectively opened above and below the window, and the bottom of the lower positioning groove is also provided with a The top plate screw holes 31 correspond to the shell tapping screw holes 21 .

Introduce the assembly process of the present utility model below:

(1), first install the leftmost clamping line, put one end of the clamping line 3 provided with the slot 33 upwards, and insert the middle vertical part of the "I"-shaped clamping line into the positioning groove 22 above the window, and at the same time, the housing 2 The panel of the clamp line 3 is snapped into the slot 33 of the clamping line 3 to form a cross-recessed structure for occlusal positioning and fixing; the positioning boss 32 at the other end of the clamping line 3 is inserted into the positioning slot 22 under the window, and the screw hole 31 of the top plate just overlaps the shell On the body screw hole 21, and then drive a screw 6, the clip line can be fixed on the housing window;

(2), then install the first row of shielded cables, strip off a certain length of sheath at the position where the shielded cables 5 pass through the shielded shell, and expose the metal braided shielding layer of the cable, so that the braided shielding layer of each cable and the conductive liner keep in good touch;

(3), and then install the second clamping line, so that the conductive pads on the two clamping lines clamp the first row of shielded cables, repeat the above steps until all the clamping lines and shielded cables are installed.

Since the pre-compression between the conductive pads on two adjacent clamping bars has been considered in the design, good electrical contact can be maintained between the two adjacent conductive pads where no cables are installed. In this way, an electrical continuous whole is formed between the shielding case 2, the clamping bars 3, the conductive gasket 4 and the metal braid of the shielded cable 5, which effectively meets the shielding requirements when the shielded cable goes out of the cabinet.

By adjusting the number of clamping lines 3 or increasing the length of the clamping lines, the requirements for the number of different cables can be met; by adjusting the cross-sectional width dimension of the conductive gasket 4 and the distance between the clamping lines 3, the requirements of different cable outer diameters can also be met. Require.

Compared with the prior art, the utility model can save complex processing and assembly procedures, and reduce one part (metal cover plate) compared with the original design, improve operability and maintainability, and conform to DFMA (Oriented to Manufacturing and assembly design) design criteria.

Claims (6)

1. A shielding shell, characterized in that a window for letting the shielded cable pass through is opened on the shell, and at least two metal clamping lines arranged in parallel at a predetermined distance are arranged in the window; The cross-section of the clamping line is an "I"-shaped structure, and conductive pads are symmetrically installed on both sides of the clamping line, and the conductive pads on two adjacent clamping lines are extruded and contacted with each other. 2. The shielding shell according to claim 1, wherein the window is rectangular, and the two ends of the clamping lines are fixed on the shell on the upper, lower or left and right sides of the rectangular window. 3. The shielding case according to claim 2, wherein the length of the base of the "I"-shaped clamping line is less than the width of the window in the installation direction of the clamping line, the length of the top plate is greater than the width of the window in the installation direction of the clamping line, and the length of the clamping line The base is fitted into the window of the housing inwardly, and the top plate is pressed on the panels on both sides of the window. 4. The shielding case according to claim 3, characterized in that, between the top plate at one end of the "I"-shaped clamping line and the middle vertical part, there is a card slot for the case panel to be snapped in, The top plate at the other end is also provided with screw holes; the upper, lower or left and right sides of the rectangular window are provided with positioning grooves that cooperate with the two ends of the middle vertical part of the "I"-shaped clip line, and one side is also provided with The shell screw holes corresponding to the top plate screw holes. 5. The shielding case according to claim 4, characterized in that, the slot at one end of the "I"-shaped clamping line clamps the housing panel, and the middle vertical parts at both ends are inserted into both sides of the window The positioning slots of the top plate and the screw holes of the housing are fixedly connected by screws. 6. The shielding case according to any one of claims 1-5, wherein the conductive gasket is symmetrically glued to the left and right sides of the "I"-shaped clip line by means of double-sided adhesive tape.

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