CN115568195A - Shielding structure and method for cabin with high shielding requirement for penetration of unshielded cable - Google Patents

Abstract

A shielding structure and method for an unshielded cable to penetrate a cabin with high shielding requirements. The shielding structure includes a metal boss connected to the inside of the cabin, and the cable passing through the cabin passes through the metal boss, the cable through the cabin hole of the cabin, and passes through the cabin. The connector of the cable is plugged into the equipment in the cabin; the aluminized film wraps the cable through the cabin, wraps the connector until it overlaps with the equipment shell, wraps the outer wall of the metal boss until it overlaps with the cabin; shielding methods include: The film wraps the cable through the cabin. The starting point and the end point of the package are the plug-in base and the position of the cable through the cabin. Both ends are reserved with aluminized film; after the connector is inserted into the device, the reserved aluminized film is completely wrapped around the connector and connected The equipment shell is well lapped; install a metal boss at the position of the cable penetration hole, pass the cable through the metal boss out of the cabin, completely wrap the reserved aluminized film on the outer wall of the metal boss and have a good lap with the deck . The utility model has the advantages of low cost, simple and convenient operation and easy realization, and can effectively control damage to the shielding effectiveness of the cabin body by the penetration cable.

Description

A shielding structure and method for an unshielded cable to penetrate a cabin with high shielding requirements

technical field

The invention relates to a shielding structure and method for an unshielded cable to penetrate a cabin with high shielding requirements, and belongs to the technical field of cabin/cabinet shielding.

Background technique

More and more spacecraft such as satellites are equipped with high-sensitivity electronic receivers. In order to ensure that the receiver will not be affected by the interference of the spacecraft itself, the spacecraft body requires a very high shielding efficiency design, that is, to ensure that the equipment inside the spacecraft body The interference signal emitted by the cable and the cable will not be transmitted to the external interference high-sensitivity receiving antenna of the spacecraft.

For the design of high shielding effectiveness of the spacecraft body, the most difficult thing to deal with is the cable that penetrates the body. Among them, the unshielded cable is the most difficult to apply shielding measures, which seriously damages the shielding effectiveness of the body. Therefore, there is an urgent need to design an effective and convenient shielding method for unshielded cables to penetrate the cabin with high shielding requirements, so as to meet the needs of model applications.

Contents of the invention

The technical solution of the present invention is to propose a shielding structure and method for an unshielded cable to penetrate a cabin with high shielding requirements, and to reduce its damage to the shielding effectiveness of the cabin under the premise of ensuring the normal transmission of signals by the unshielded cable, effectively Improve the shielding ability of the cabin.

Technical solution of the present invention is:

A shielding structure in which an unshielded cable penetrates a cabin with high shielding requirements, including:

The metal boss is connected to the inside of the cabin body, the cable through the cabin passes through the metal boss, and passes through the cabin body through the cable hole, and the connector of the cable through the cabin is plugged into the equipment in the cabin;

Aluminized film wraps the cable through the cabin, and wraps the connectors of the cable through the cabin at both ends until it overlaps with the equipment shell, and wraps the outer wall of the metal boss until it overlaps with the cabin.

The metal boss is in the shape of a circular tube, and one end of the outer wall of the metal boss is provided with a base, and the base is connected to the cabin body by screws.

The height of the boss protruding into the cabin is 40-60mm, and the inner diameter of the metal boss is consistent with the diameter of the cable penetration hole.

The aluminized film is a double-sided or single-sided porous film with a thickness of 18-25 μm, and the length reserved at both ends after wrapping the cable is 200-500 mm; the aluminized film is an aluminized polyimide film.

At the part where the aluminized film wraps from the penetrating cable to overlaps with the equipment shell, the resistance of any two points is less than 10mΩ;

At the part where the aluminized film wraps from the penetrating cable to the outer wall of the metal boss and overlaps with the deck, the resistance of any two points is less than 10mΩ.

The resistance between the base of the metal boss and the cabin body is less than 10mΩ.

In the part after the aluminized film wraps the penetrating cable, the resistance of any two points is less than 15mΩ.

The folds or bending gaps of the aluminized film are fixed with adhesive tape, and the adhesive tape is conductive adhesive tape.

The method of wrapping the cable with the aluminized film is as follows: cut the width of each aluminized film to about 30-50 mm, and overlap the front and rear circles of the aluminized film by about 40-60% when winding; The two layers are opposite in clockwise direction; after one aluminized film is wound, the next aluminized film is wrapped 100-200mm backward from the position where the previous one ends, and the place where the aluminized film touches is fixed with tape .

A shielding method for an unshielded cable to penetrate a cabin with high shielding requirements, the steps are as follows:

(1) Use aluminized polyimide film to wrap the cables that need to pass through the cabin. The starting point and end point of the package are the bottom of the cable connector base and the position where the cable goes through the cabin respectively, and a certain length of aluminized film is reserved at both ends;

(2) After the cable connector is inserted into the equipment, wrap the reserved aluminized film to the connector until the aluminized film completely wraps the connector and overlaps well with the equipment shell;

(3) Install a metal boss at the position of the cable penetration hole. The boss is a base fixed on the deck with screws, and has a cylindrical pipe protruding into the cabin; the cable passing through the cabin is passed out of the cabin through the cylindrical pipe of the boss. Wrap the reserved aluminized film to the outer wall of the boss pipe until the outer wall of the pipe is completely wrapped and well lapped with the deck.

The aluminized polyimide film in step (1) should be double-sided or single-sided with holes, the thickness is 18 μm, and 200mm is reserved at both ends after wrapping the cable; the method of wrapping the cable with the aluminized film is: The width of each aluminum-coated film is about 40mm, and the front and rear circles of the aluminum-coated film overlap each other by about 50% when winding; the cables are bundled and wrapped with two layers of aluminum-coated film, and the clockwise and counterclockwise directions of the two layers are opposite; one aluminum-coated film is wound. Finally, the next aluminized film should be wrapped 100-200mm backward from the end position of the previous one; when wrapping the cable, ensure that the aluminized film is wrapped around the cable tightly enough, there is no gap at the overlapping place, and the gap at the bend is covered with a plated film. The aluminum tape is wrapped and fixed to prevent gaps; the cable should be wrapped with a brand-new non-wrinkled aluminized film to ensure that the aluminized film is wrapped at one time, with less creases to ensure the electrical continuity of the aluminized film. Any two points on the aluminized film The resistance should be less than 15mΩ.

The aluminized film in step (2) completely wraps the connector and overlaps well with the equipment shell. It is necessary to use aluminized tape to tightly bind the folds generated at the transition point between the cable and the connector without revealing the gap; the aluminized film, the connector It should form an electrical continuum with the equipment shell, and the lap resistance between the aluminized film and the equipment shell should be less than 10mΩ.

In step (3), the boss base is fastened on the deck with at least four screws, and the resistance between the boss base and the deck should be less than 10mΩ; Consistent with the diameter of the cable penetration hole. The aluminized film is wrapped to the outer wall of the cylindrical pipe of the boss and well overlapped with the deck, and the resistance of any two should be less than 10mΩ.

In summary, the present application at least includes the following beneficial technical effects:

(1) The method of the present invention greatly reduces the damage to the shielding effectiveness of the cabin by unshielded cables penetrating the cabin, optimizes the shielding effectiveness of the cabin, thereby reducing the leakage of the radiation signal in the spacecraft cabin to the high-sensitivity receiving antenna outside the cabin ;

(2) The use of the method of the present invention can also reduce the interference signal outside the cabin to be transmitted to the spacecraft cabin for radiation through the unshielded cable through the cabin, thereby improving the ability of other equipment in the cabin to resist the external electromagnetic environment.

Description of drawings

Fig. 1 is the schematic diagram of shielding treatment of the present invention;

Fig. 2 is a schematic flow chart of the present invention.

Explanation of reference signs: 1. cabin body; 2. cable penetration hole; 3. cabin penetration cable; 4. metal boss; 5. aluminized film.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the application is described in further detail:

The embodiment of the present application discloses a shielding structure and method for an unshielded cable to penetrate a cabin with high shielding requirements. Referring to FIG. Not shown in the figure) inside, the cable 3 through the cabin passes through the metal boss 4, and passes through the cabin body 1 through the cable cabin hole 2, and the plug-in piece of the cable through the cabin 3 is plugged with the equipment in the cabin body 1; The aluminum film 5 wraps the cabin-piercing cable 3, and wraps the connectors of the cabin-piercing cable 3 at both ends until it overlaps well with the equipment casing, and wraps the outer wall of the metal boss 4 until it overlaps well with the deck of the cabin body 1.

The metal boss 4 is in the shape of a circular tube, and one end of the outer wall of the metal boss 4 is provided with a base, and the base is connected to the cabin body 1 by screws. The height that the boss protrudes into the cabin is 40-60mm, and the inner diameter of the metal boss 4 is consistent with the diameter of the cable penetration hole 2. The material of the metal boss 4 is generally aluminum alloy, and the wall thickness is about 3 mm. The base of the metal boss 4 should be able to completely block the penetration of the deck.

The aluminized film 5 is an aluminized polyimide film. The aluminized polyimide film should be double-sided or single-sided with holes, the thickness is 18μm, and the length reserved at both ends after wrapping the cable is 200mm.

As shown in Figure 2, the shielding method methods include:

Step 1: Use double-sided or single-sided perforated aluminized film 5 to wrap the penetrating cable 3 that needs to pass through the cabin body 1. The thickness of the aluminized film 5 is 18 μm, and the starting point and end point of the wrapping are respectively the connector base of the penetrating cable 3 200-500 mm of aluminized film 5 is reserved at both ends of the bottom and the position where the cable passes through the cabin. In this embodiment, 200 mm of aluminized film 5 is reserved at both ends. When wrapping, first cut the aluminized film 5 to a width of about 40mm, and when winding, the two turns of the aluminized film 5 overlap each other by about 50%; The counterclockwise direction is opposite. For example, the first layer is wound clockwise, and the second time is wound counterclockwise; after one aluminized film 5 is wound, the next aluminized film 5 should be 100 degrees backward from the position where the previous one ended. -200mm to start wrapping, and the place where the aluminized film 5 contacts is fixed with aluminized tape; when wrapping the penetrating cable 3, it is necessary to ensure that the aluminized film 5 is wrapped around the penetrating cable 3 tightly enough, and there is no gap at the overlapping part, and the gap at the bending part should be used Aluminized tape is wrapped and fixed to prevent gaps from appearing; the cable should be wrapped with a brand-new non-wrinkled aluminized film 5 to ensure that the aluminized film 5 is wrapped at one time, with less creases, so as to ensure that the resistance of any two points of the aluminized film 5 should be Less than 15mΩ.

Step 2: After the connector of the through-cabin cable 3 is inserted into the equipment, wrap the reserved aluminized film 5 to the connector until the aluminized film 5 completely wraps the connector, and use aluminum-coated tape to seal the connector between the through-cabin cable 3 and the connector. The folds generated in the transitional area should be tightly bound without revealing the gap; the aluminized film 5, the connector and the equipment shell should form an electrical continuum, and the lap resistance between the aluminized film 5 and the equipment shell should be less than 10mΩ.

Step 3: Install the metal boss 4 at the position of the cable penetration hole 2. The base of the metal boss 4 is fixed on the deck with at least 4 screws. The resistance between the base of the metal boss 4 and the deck should be less than 10mΩ; the metal boss 4 The height protruding into the cabin is 50 mm, and the metal boss 4 is a cylindrical pipe whose inner diameter is consistent with the diameter of the cable penetration hole 2; the cabin penetration cable 3 is passed through the boss to leave the cabin, and the reserved aluminum plated The film 5 is wrapped to the outer wall of the metal boss 4 until the outer wall of the metal boss 4 is completely wrapped and well overlapped with the deck, and the resistance of any two points of the aluminized film 5, the metal boss 4 and the deck of the cabin body 1 should be less than 10mΩ .

The content that is not described in detail in the description of the present invention belongs to the well-known technology of those skilled in the art.

All of the above are preferred embodiments of the application, and are not intended to limit the protection scope of the application. Therefore, all equivalent changes made according to the structure, shape, and principle of the application should be covered by the protection scope of the application. Inside.

Claims (10)

1. The utility model provides a non-shielded cable pierces through shielding structure of high shielding requirement cabin body which characterized in that: comprises that

The cabin penetrating cable (3) penetrates through the metal boss (4) and penetrates through the cabin body (1) through the cable cabin penetrating hole (2), and a plug connector of the cabin penetrating cable (3) is plugged with equipment in the cabin body (1);

aluminizer (5), parcel cross cabin cable (3), the plug connector of one end parcel cross cabin cable (3) is until and equipment shell good overlap joint, other end parcel metal boss (4) outer wall until and cabin body (1) good overlap joint.

2. The shielding structure of the cabin with high shielding requirement for penetrating the unshielded cable according to claim 1, wherein: the metal boss (4) is in a circular tube shape, a base is arranged at one end of the outer wall of the metal boss (4), and the base is connected to the cabin body (1) through screws.

3. The shielding structure of the cabin with high shielding requirement for penetrating the unshielded cable according to claim 1, wherein: the height of the boss protruding into the cabin is 40-60mm, and the inner diameter of the metal boss (4) is consistent with the diameter of the cable cabin penetrating hole (2).

4. The shielding structure of the unshielded cable penetration high shielding requirement cabin according to claim 1, characterized in that: the aluminizer (5) is a double-sided or single-sided perforated film, the thickness is 18-25 mu m, and the length reserved at two ends after the cable is wrapped is 200-500mm;

the aluminized film (5) is an aluminized polyimide film.

5. The shielding structure of the cabin with high shielding requirement for penetrating the unshielded cable according to claim 1, wherein: the aluminizer (5) is wrapped from the cabin-penetrating cable (3) to a part lapped with the equipment shell, and the resistance of any two points is less than 10m omega;

and in the part of the aluminizer (5) which is wrapped from the cabin-penetrating cable (3) to the outer wall of the metal boss (4) and is lapped with the cabin plate, the resistance of any two points is less than 10m omega.

6. The shielding structure of the unshielded cable penetration high shielding requirement cabin according to claim 1, characterized in that: the resistance between the base of the metal boss (4) and the cabin body (1) is less than 10m omega.

7. The shielding structure of the cabin with high shielding requirement for penetrating the unshielded cable according to claim 1, wherein: the resistance of any two points at the part of the aluminum-plated film (5) wrapping the cabin-penetrating cable (3) is less than 15m omega.

8. The shielding structure of the cabin with high shielding requirement for penetrating the unshielded cable according to claim 1, wherein: the folds or the bending gaps of the aluminizer (5) are fixed by using an adhesive tape; the adhesive tape is a conductive adhesive tape.

9. The shielding structure of the cabin with high shielding requirement for penetrating the unshielded cable according to claim 1, wherein: the method for wrapping the cable by the aluminum-plated film (5) comprises the following steps: cutting each width of the aluminizer (5) to be about 30-50mm, and overlapping the front circle and the rear circle of the aluminizer (5) to be about 40-60% during winding; the cabin penetrating cable (3) is bundled to be wrapped by two layers of aluminizers (5), and the clockwise and anticlockwise directions of the two layers are opposite; after one aluminizer (5) is wound, the next aluminizer (5) starts to wrap 100-200mm backwards from the last finished position, and the contact position of the aluminizers (5) is fixed by an adhesive tape.

10. A shielding method for a non-shielded cable to penetrate a cabin (1) with high shielding requirement is characterized in that: the method comprises the following steps:

wrapping the cabin-penetrating cable (3) by using an aluminum-plated film (5), wherein the starting point and the end point of the wrapping are respectively the bottom of a socket connector base of the cabin-penetrating cable (3) and the cabin-penetrating position of the cable, and the aluminum-plated films (5) are reserved at two ends;

after a connector of the cabin-penetrating cable (3) is inserted into equipment, a reserved aluminizer (5) is completely wrapped to the connector and is in good lap joint with an equipment shell;

the metal boss (4) is arranged at the cable cabin penetrating hole (2) of the cabin body (1), the cabin penetrating cable (3) is taken out of the cabin through the boss cylindrical pipeline, and the reserved aluminum-plated film (5) completely wraps the outer wall of the boss and is in good lap joint with the cabin plate.

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