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

Abstract

A shielding structure and method for unshielded cables penetrating a cabin with high shielding requirements. The shielding structure includes a metal boss connected to the inside of the cabin. The cabin-penetrating cable passes through the metal boss and the cabin's cable hole, and the cabin-penetrating cable's connector plugs into the equipment inside the cabin. Aluminum film is wrapped around the cabin-penetrating cable, the connector until it overlaps the equipment casing, and the outer wall of the metal boss until it overlaps the cabin. The shielding method includes: wrapping the cabin-penetrating cable with aluminum film, with the wrapping starting and ending at the plug base and the cabin-penetrating cable insertion position, and leaving a reserve of aluminum film at both ends. After the connector is inserted into the equipment, the reserved aluminum film is completely wrapped around the connector and ensures a good overlap with the equipment casing. A metal boss is installed at the cable hole, and the cabin-penetrating cable is passed through the metal boss and out of the cabin. The reserved aluminum film is completely wrapped around the outer wall of the metal boss and ensures a good overlap with the cabin panel. This method is low-cost, simple to operate, and easy to implement, and can effectively prevent the cabin-penetrating cable from damaging the cabin shielding effectiveness.

Description

Technical Field

[0001] The present invention relates to a shielding structure and method for a non-shielded cable to penetrate a cabin with high shielding requirements, belonging to the technical field of cabin / box shielding. Background Art

[0002] Satellites and other spacecraft are increasingly equipped with highly sensitive electronic receivers. To ensure that the receivers are not affected by interference from the spacecraft's own radiation, the spacecraft itself requires a very high shielding effectiveness design, that is, to ensure that the interference signals radiated by the equipment and cables inside the spacecraft body will not be transmitted to the outside of the spacecraft to interfere with the highly sensitive receiving antenna.

[0003] When designing high-shielding-effective spacecraft, the most challenging part is the cables that penetrate the spacecraft. Unshielded cables are particularly challenging to shield, as they severely damage the spacecraft's shielding effectiveness. Therefore, an effective and easily implemented shielding method for unshielded cables penetrating high-shielding-requirement cabins is urgently needed to meet the demands of these applications. Summary of the Invention

[0004] The technical problem solved by the present invention is: to propose a shielding structure and method for non-shielded cables to penetrate a cabin with high shielding requirements, while ensuring that the non-shielded cables can transmit signals normally, reducing their damage to the cabin's shielding effectiveness and effectively improving the cabin's shielding capability.

[0005] The technical solution of the present invention is:

[0006] A shielding structure for an unshielded cable to penetrate a cabin with high shielding requirements, comprising:

[0007] The metal boss is connected to the inner side of the cabin, and the cabin penetration cable passes through the metal boss and through the cabin through the cable hole, and the connector of the cabin penetration cable is plugged into the equipment in the cabin;

[0008] Aluminum film is used to wrap the cabin penetration cable, and the connectors of the cabin penetration cable are wrapped at both ends until they are well overlapped with the equipment casing, and the outer wall of the metal boss is wrapped until it is well overlapped with the cabin body.

[0009] The metal boss is in the shape of a circular tube. A base is provided at one end of the outer wall of the metal boss, and the base is connected to the cabin body by screws.

[0010] The height of the boss protruding into the cabin is 40-60 mm, and the inner diameter of the metal boss is consistent with the diameter of the cable hole.

[0011] The aluminized film is a double-sided or single-sided perforated film with a thickness of 18-25 μm. After wrapping the cable, the length reserved at both ends is 200-500 mm. The aluminized film is an aluminized polyimide film.

[0012] The resistance between any two points of the aluminum film from the portion where the aluminum film is wrapped around the cable to the portion where the aluminum film is connected to the equipment casing is less than 10 mΩ;

[0013] In the section where the aluminum film wraps around the cabin cable, extends to the outer wall of the metal boss, and overlaps with the cabin panel, the resistance between any two points is less than 10mΩ.

[0014] The resistance between the base of the metal boss and the cabin is less than 10mΩ.

[0015] In the portion after the aluminized film wraps the cabin penetration cable, the resistance between any two points is less than 15 mΩ.

[0016] The wrinkles or bending gaps of the aluminized film are fixed with adhesive tape, which is a conductive adhesive tape.

[0017] The method for wrapping the cable with aluminized film is as follows: each piece of the aluminized film is cut to a width of about 30-50 mm, and when wrapping, the front and rear circles of the aluminized film overlap each other by about 40-60%; the cabin-penetrating cables are bundled and wrapped with two layers of aluminized film, and the two layers are wrapped in opposite clockwise and counterclockwise directions; after one piece of aluminized film is wrapped, the next piece of aluminized film is wrapped 100-200 mm backward from the end position of the previous piece, and the contact points of the aluminized film are fixed with tape.

[0018] A shielding method for an unshielded cable to penetrate a cabin with high shielding requirements, the steps are as follows:

[0019] (1) Use aluminum-plated polyimide film to wrap the cable that needs to pass through the cabin. The starting point and end point of the wrapping are the bottom of the cable connector base and the position where the cable passes through the cabin, respectively. A certain length of aluminum-plated film is reserved at both ends;

[0020] (2) After the cable connector is inserted into the device, wrap the reserved aluminum film around the connector until the aluminum film completely covers the connector and is well connected to the device housing;

[0021] (3) Install a metal boss at the position of the cable hole. The boss is a base fixed to the cabin plate with screws and has a cylindrical pipe protruding into the cabin. Pass the cabin cable out of the cabin through the boss cylindrical pipe and wrap the reserved aluminum film to the outer wall of the boss pipe until the outer wall of the pipe is completely wrapped and well overlapped with the cabin plate.

[0022] The aluminized polyimide film of step (1) should be a double-sided or single-sided perforated film with a thickness of 18 μm, and 200 mm should be reserved at both ends after wrapping the cable; the method of wrapping the cable with the aluminized film is as follows: cutting the width of each aluminized film to about 40 mm, and when wrapping, the front and rear circles of the aluminized film overlap by about 50%; the cables are bundled and wrapped with two layers of aluminized film, and the two layers are in opposite clockwise and counterclockwise directions; after one aluminized film is wrapped, the next aluminized film should be wrapped 100-200 mm backward from the end position of the previous one; when wrapping the cable, it is necessary to ensure that the aluminized film is wrapped around the cable tightly enough, without gaps at the overlaps, and the gaps at the bends are wrapped and fixed with aluminized tape to prevent gaps from appearing; a brand new wrinkle-free aluminized film should be used to wrap the cable to ensure that the aluminized film is wrapped in one go with few creases to ensure the electrical continuity of the aluminized film, and the resistance between any two points of the aluminized film should be less than 15 mΩ.

[0023] In step (2), the aluminized film completely wraps the connector and is well overlapped with the device housing. Aluminized tape is needed to tightly bind the wrinkles generated at the transition from the cable to the connector without leaving any gaps. The aluminized film, the connector and the device housing should form an electrical continuum, and the overlap resistance between the aluminized film and the device housing should be less than 10mΩ.

[0024] In step (3), the boss base is fastened to the deck with at least four screws. The resistance between the boss base and the deck should be less than 10mΩ. The height of the boss protruding into the deck is 40-60mm. The inner diameter of the cylindrical pipe is consistent with the diameter of the cable hole. The aluminum film is wrapped around the outer wall of the boss cylindrical pipe and well overlaps the deck. The resistance between the two should be less than 10mΩ.

[0025] In summary, this application has at least the following beneficial technical effects:

[0026] (1) The method of the present invention greatly reduces the damage to the shielding effectiveness of the cabin caused by the penetration of unshielded cables into the cabin, optimizes the shielding effectiveness of the cabin, and thus reduces the leakage of radiation signals from the spacecraft cabin to the outside of the cabin to interfere with the highly sensitive receiving antenna;

[0027] (2) The method of the present invention can also reduce the radiation of external interference signals transmitted to the spacecraft cabin through the unshielded cable through the cabin, thereby improving the ability of other equipment in the cabin to resist the external electromagnetic environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the shielding process of the present invention;

[0029] Figure 2 It is a schematic diagram of the process of the present invention.

[0030] Explanation of the accompanying reference numerals: 1. Cabin body; 2. Cable hole; 3. Cabin cable; 4. Metal boss; 5. Aluminum film. DETAILED DESCRIPTION

[0031] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0032] The present application discloses a shielding structure and method for an unshielded cable to penetrate a cabin with high shielding requirements. Figure 1 The shielding structure includes a metal boss 4 and an aluminum-plated film 5. The metal boss 4 is connected to the inner side of the cabin 1 (not shown in the figure). The cabin cable 3 passes through the metal boss 4 and passes through the cabin 1 through the cable hole 2. The connector of the cabin cable 3 is plugged into the equipment in the cabin 1; the aluminum-plated film 5 wraps the cabin cable 3, and the two ends respectively wrap the connector of the cabin cable 3 until it is well overlapped with the equipment casing, and wraps the outer wall of the metal boss 4 until it is well overlapped with the cabin panel of the cabin 1.

[0033] The metal boss 4 is tubular, with a base at one end of its outer wall, which is screwed to the cabin hull 1. The height of the boss protruding into the cabin is 40-60 mm, and the inner diameter of the metal boss 4 matches the diameter of the cable entry hole 2. The metal boss 4 is typically made of aluminum alloy with a wall thickness of approximately 3 mm. The base of the metal boss 4 should completely block the penetration of the cabin panel.

[0034] The aluminized film 5 is an aluminized polyimide film. The aluminized polyimide film should be a double-sided or single-sided perforated film with a thickness of 18 μm. After wrapping the cable, the length reserved at both ends is 200 mm.

[0035] like Figure 2 As shown, the shielding methods include:

[0036] Step 1: Use double-sided or single-sided perforated aluminum-plated film 5 to wrap the cabin-penetrating cable 3 that needs to pass through the cabin body 1. The thickness of the aluminum-plated film 5 is 18 μm. The starting point and end point of the wrapping are the bottom of the connector base of the cabin-penetrating cable 3 and the position where the cable passes through the cabin, respectively. 200-500 mm of aluminum-plated film 5 is reserved at both ends. In this embodiment, 200 mm of aluminum-plated film 5 is reserved at both ends. When wrapping, first cut the aluminized film 5 to a width of about 40mm. When wrapping, the front and rear circles of the aluminized film 5 overlap each other by about 50%; the cabin-penetrating cables 3 are bundled and wrapped with two layers of aluminized film 5, and the clockwise and counterclockwise directions of the two layers are opposite, such as the first layer is wound clockwise and the second layer is wound counterclockwise; after one aluminized film 5 is wrapped, the next aluminized film 5 should be wrapped 100-200mm back from the end position of the previous one, and the contact points of the aluminized film 5 are fixed with aluminized tape; when wrapping the cabin-penetrating cable 3, ensure that the aluminized film 5 is wrapped around the cabin-penetrating cable 3 tightly enough, with no gaps at the overlapping parts, and the gaps at the bends are wrapped and fixed with aluminized tape to prevent gaps from appearing; a brand new, wrinkle-free aluminized film 5 should be used to wrap the cable to ensure that the aluminized film 5 is wrapped in one go with few creases, so as to ensure that the resistance of any two points of the aluminized film 5 is less than 15mΩ.

[0037] Step 2: After the connector of the through-cabin cable 3 is inserted into the equipment, wrap the reserved aluminized film 5 around the connector until the aluminized film 5 completely covers the connector, and use aluminized tape to tightly bind the wrinkles generated at the transition from the through-cabin cable 3 to the connector without leaving any gaps; the aluminized film 5, the connector and the equipment casing should form an electrical continuum, and the lap resistance between the aluminized film 5 and the equipment casing should be less than 10mΩ.

[0038] Step 3: Install the metal boss 4 at the position of the cable hole 2. The base of the metal boss 4 is fixed to the cabin plate with at least 4 screws. The resistance between the base of the metal boss 4 and the cabin plate should be less than 10mΩ; the height of the metal boss 4 protruding into the cabin is 50mm. The metal boss 4 is a cylindrical pipe with an inner diameter consistent with the diameter of the cable hole 2. Pass the cabin cable 3 through the boss and exit the cabin. Wrap the reserved aluminum film 5 around 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 cabin plate. The resistance between any two points of the aluminum film 5, the metal boss 4 and the cabin plate of the cabin body 1 should be less than 10mΩ.

[0039] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

[0040] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A shielding structure for non-shielded cables to penetrate a cabin with high shielding requirements, characterized in that: include: The metal boss (4) is connected to the inner side of the cabin body (1); the cabin penetration cable (3) passes through the metal boss (4) and passes through the cabin body (1) through the cable cabin penetration hole (2); and the connector of the cabin penetration cable (3) is plugged into the equipment in the cabin body (1); An aluminum film (5) is wrapped around the cabin penetration cable (3), with one end wrapping around the connector of the cabin penetration cable (3) until it is well connected to the equipment housing, and the other end wrapping around the outer wall of the metal boss (4) until it is well connected to the cabin body (1); The resistance between any two points of the aluminum-plated film (5) from the portion where the cable (3) is wrapped to the portion where the aluminum-plated film (5) overlaps with the device housing is less than 10 mΩ; In the portion where the aluminum film (5) wraps around the cabin cable (3) to the outer wall of the metal boss (4) and overlaps with the cabin plate, the resistance between any two points is less than 10 mΩ; The resistance between any two points of the portion after the aluminized film (5) wraps the cabin penetration cable (3) is less than 15 mΩ; The method of wrapping the cable with the aluminized film (5) is as follows: the cabin-penetrating cables (3) are bundled and wrapped with two layers of the aluminized film (5), with the two layers being wrapped in opposite clockwise and counterclockwise directions.

2. The shielding structure for unshielded cables penetrating a cabin with high shielding requirements according to claim 1, characterized in that: The metal boss (4) is in the shape of a circular tube, and a base is provided at one end of the outer wall of the metal boss (4), and the base is connected to the cabin (1) via screws.

3. The shielding structure for non-shielded cables penetrating a cabin with high shielding requirements according to claim 1, characterized in that: The height of the boss protruding into the cabin is 40-60 mm, and the inner diameter of the metal boss (4) is consistent with the diameter of the cable hole (2).

4. The shielding structure for unshielded cables penetrating a cabin with high shielding requirements according to claim 1, characterized in that: The aluminized film (5) is a double-sided or single-sided perforated film with a thickness of 18-25 μm. After wrapping the cable, the length reserved at both ends is 200-500 mm. The aluminized film (5) is an aluminized polyimide film.

5. The shielding structure for unshielded cables penetrating a cabin with high shielding requirements according to claim 1, characterized in that: The resistance between the base of the metal boss (4) and the cabin (1) is less than 10 mΩ.

6. The shielding structure for unshielded cables penetrating a cabin with high shielding requirements according to claim 1, characterized in that: The wrinkles or bends of the aluminized film (5) are fixed with adhesive tape; the adhesive tape is a conductive adhesive tape.

7. The shielding structure for unshielded cables penetrating a cabin with high shielding requirements according to claim 1, characterized in that: When the aluminized film (5) is wrapped around the cable, the width of each aluminized film (5) is cut to about 30-50 mm, and when winding, the front and rear turns of the aluminized film (5) overlap by about 40-60%; After one aluminized film (5) is wound, the next aluminized film (5) is wrapped 100-200 mm backward from the end position of the previous one, and the contact area of ​​the aluminized film (5) is fixed with tape.

8. A shielding method for an unshielded cable penetrating a cabin (1) with high shielding requirements, characterized in that: include: The cable (3) is wrapped with an aluminum film (5), the starting point and the end point of the wrapping are respectively the bottom of the connector base of the cable (3) and the position where the cable passes through the cabin, and the aluminum film (5) is reserved at both ends; After the connector of the through-cabin cable (3) is inserted into the device, the reserved aluminum film (5) is completely wrapped around the connector and well connected to the device housing; A metal boss (4) is installed at the position of the cable hole (2) of the cabin body (1), and the cabin cable (3) is passed out of the cabin through the boss cylindrical pipe. The reserved aluminum film (5) is completely wrapped around the outer wall of the boss and well overlapped with the cabin plate.

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