Electromagnetic shielding structure of heavy-current wiring terminal

Abstract

The invention provides a heavy-current wiring terminal electromagnetic shielding structure. The heavy-current wiring terminal electromagnetic shielding structure comprises a cable and a wiring terminal, the cable protection layer is arranged on the outer side of the cable in a sleeving manner; the protective cover is fixedly arranged on the periphery of the wiring terminal, the protective cover is provided with a separation cavity, and the wiring terminal is arranged in the separation cavity; and the wire passing mouth is arranged at the joint of the cable and the wiring terminal, and the wire passing mouth is in electric lap joint with the protective cover. By adopting a dual electromagnetic shielding structure and an electrical insulation structure, good electromagnetic shielding performance and insulation protection performance are realized, electromagnetic shielding and mechanical protection are carried out on the wiring terminals and the cables, and the cable connector has the advantages of being reliable in structure, good in electromagnetic shielding performance and convenient to maintain. The high-integration development requirement of airborne equipment and the harsh use environment requirement can be met, and meanwhile, the electromagnetic compatibility of the product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical structures, and in particular to an electromagnetic shielding structure of a large current terminal block. Background Art

[0002] With the development of aviation equipment, the power demand and environmental adaptability requirements of aviation motors are getting higher and higher, and the working current of motors is also getting higher and higher. Especially in the field of low-voltage DC 28V high-power pump motors, due to the strong radiation interference caused by high current transmission, the electromagnetic compatibility of products is generally poor. Other electrical equipment cannot be arranged around such motors on the aircraft, which seriously restricts the improvement of the integration level and working reliability of airborne equipment. Summary of the invention

[0003] In view of this, the present specification provides an electromagnetic shielding structure for a high-current terminal block to achieve the purpose of improving working reliability.

[0004] This specification provides the following technical solutions: an electromagnetic shielding structure of a high-current terminal block, comprising: a cable and a terminal block; a cable protective layer, which is sleeved on the outside of the cable; a protective cover, which is fixedly arranged on the periphery of the terminal block, the protective cover has a cavity, and the terminal block is placed in the cavity; a wire nozzle, which is arranged at the connection between the cable and the terminal block, and the wire nozzle is electrically overlapped with the protective cover.

[0005] Furthermore, the cable protective layer includes a small insulating sleeve which is sleeved on the outer layer of the cable.

[0006] Furthermore, the cable protection layer also includes a wave-proof sleeve, which is sleeved on the outside of the small insulating sleeve.

[0007] Furthermore, the cable protective layer also includes a shielding tape wrapped around the outer surface of the wave-proof sleeve, and one end of the shielding tape is wrapped around the overlapping boss of the wire mouth.

[0008] Furthermore, the electromagnetic shielding structure of the large current terminal block also includes a large insulating sleeve, which is sleeved on the outside of the shielding tape.

[0009] Furthermore, the protective cover is made of an electromagnetic shielding structural material, the outer surface of the protective cover is provided with a coating layer resistant to corrosion, and the inner surface of the protective cover is provided with an insulating paint layer.

[0010] Furthermore, the wire passing nozzle includes a rectangular mounting flange and a circular overlapping boss connected in sequence, the wire passing nozzle is axially provided with a circular wire passing hole, the outer surface of the wire passing nozzle is provided with a corrosion-resistant coating layer, and the inner surface of the wire passing nozzle is provided with an insulating paint layer.

[0011] Furthermore, the wave-proof sleeve is a metal sleeve woven from tinned copper wires; the shielding tape is a copper wire woven square hole mesh; and the small insulating sleeve and the large insulating sleeve are both heat-shrinkable electrical insulating sleeves.

[0012] Furthermore, the protective cover includes a plurality of compartments arranged at intervals, and each compartment corresponds to a wiring terminal.

[0013] Compared with the prior art, at least one of the above-mentioned technical solutions adopted in the embodiments of this specification can achieve at least the following beneficial effects: by adopting a double electromagnetic shielding structure and an electrical insulation structure, good electromagnetic shielding performance and insulation protection performance can be achieved, and electromagnetic shielding and mechanical protection can be performed on terminal blocks and cables. It has the advantages of reliable structure, good electromagnetic shielding and easy maintenance, and can meet the development needs of highly integrated airborne equipment and the requirements of harsh use environments, while improving the electromagnetic compatibility of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 for Figure 1 A partial enlarged view of the AA section;

[0017] Figure 3 It is a schematic diagram of the structure of the protective cover;

[0018] Figure 4 This is a structural diagram of the wire nozzle.

[0019] Reference numerals in the figure: 1. Protective cover; 2. Wire mouth; 3. Small insulating sleeve; 4. Wave-proof sleeve; 5. Shielding tape; 6. Large insulating sleeve; 7. Wiring terminal; 8. Cable. DETAILED DESCRIPTION

[0020] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] like Figures 1 to 4As shown, an embodiment of the present invention provides an electromagnetic shielding structure of a large current terminal block, specifically an electromagnetic shielding structure of a three-phase lead-out terminal block of a permanent magnet brushless DC motor for a DC 28V / 250A aviation pump, mainly consisting of a protective cover 1, a wire mouth 2, a small insulating sleeve 3, a wave-proof sleeve 4, a shielding tape 5 and a large insulating sleeve 6, wherein the protective cover 1 is fixed to a substrate around the terminal block 7 by mounting screws, the number of internal compartments is 3 (one compartment for each phase terminal), the number of wire mouths 2 is 3 (one wire mouth 2 for each phase lead-out line), and the protective cover 1 is fixed to the outer surface of the inlet side of the protective cover 1 by mounting screws. On; the small insulating sleeve 3 is sleeved on the outer layer of the cable 8, playing the role of the first layer of insulation protection; the wave-proof sleeve 4 is sleeved on the outer layer of the small insulating sleeve 3, playing the role of the first layer of shielding; the shielding tape 5 is half-folded and wrapped on the outer surface of the wave-proof sleeve 4, and the end of the shielding tape 5 is wrapped on the overlapping boss of the wire mouth 2, playing the role of the second layer of shielding; the large insulating sleeve 6 is sleeved on the outer layer of the shielding tape 5, playing the role of the second layer of insulation protection; thereby achieving good electromagnetic shielding performance and insulation protection performance, and performing electromagnetic shielding and mechanical protection on the terminal 7 and the cable 8. The protective cover 1 and the wire mouth 2 are made of 2A12 aluminum alloy with good electromagnetic shielding performance, and the inner surface is coated with 169 polyester modified silicone enamel for electrical isolation; the wire mouth 2 and the protective cover 1 are installed in a split type, which is convenient for the disassembly and maintenance of the cable 8; the shielding structure is from the inside to the outside, which is a small insulating sleeve 3 sleeved on the outer layer of the cable 8, a wave-proof sleeve 4 sleeved on the outer layer of the small insulating sleeve 3, a shielding tape 5 half-folded on the outer surface of the wave-proof sleeve 4, the end of the shielding tape 5 is wrapped around the overlapping boss of the wire mouth 2, and a large insulating sleeve 6 sleeved on the outer layer of the shielding tape 5.

[0023] The present invention provides an electromagnetic shielding structure for a large current terminal block. By adopting a double electromagnetic shielding structure and an electrical insulation structure, good electromagnetic shielding performance and insulation protection performance are achieved, and electromagnetic shielding and mechanical protection are performed on the terminal block and the cable. The structure has the advantages of reliable structure, good electromagnetic shielding performance, and convenient maintenance. The structure can meet the development needs of highly integrated airborne equipment and the requirements of harsh use environments, while improving the electromagnetic compatibility of the product.

[0024] The material of the protective cover 1 is 2A12 aluminum alloy with good electromagnetic shielding performance. The surface treatment measure is conductive oxidation. The outer surface is coated with QH-15 anti-corrosion epoxy primer and QFS-15 weather-resistant polyurethane enamel except the overlapping surface of the wire mouth. The inner surface is coated with 169 polyester modified silicone enamel. There are 3 compartments inside (one compartment for each phase terminal).

[0025] The material of the wire nozzle 2 is 2A12 aluminum alloy with good electromagnetic shielding performance. The surface treatment measure is conductive oxidation. The number of wire nozzles 2 is 3 (one wire nozzle corresponds to each phase lead-out line). The wire nozzle 2 consists of a 40mm×32mm rectangular mounting flange and a Φ28mm circular lap boss, with a Φ26mm circular wire hole inside. The outer surface is coated with QH-15 anti-corrosion epoxy primer and QFS-15 weather-resistant polyurethane enamel except the lap surface of the mounting flange and the outer cylindrical surface of the lap boss, and the inner surface is coated with 169 polyester modified silicone enamel.

[0026] The material of the wave-proof sleeve 4 is a metal sleeve woven from P10×16 tinned copper wires, and the braiding density is not less than 85%.

[0027] The material of the shielding tape 5 is H80 copper wire woven plain square hole mesh, and the mesh number is 200 mesh / inch.

[0028] The materials of the small insulating sleeve 3 and the large insulating sleeve 6 are both HTRST polyolefin heat shrinkable sleeves with an operating temperature range of -60°C to 120°C. The inner diameter of the large insulating sleeve 6 is Φ30mm, and the inner diameter of the small insulating sleeve 3 is Φ25mm.

[0029] It should be noted that the small insulating sleeve 3, the wave-proof sleeve 4 and the shielding tape 5 form a cable protection layer.

[0030] The advantages of the present invention are: the present invention provides a DC 28V / 250A aviation pump permanent magnet brushless DC motor three-phase lead-out terminal electromagnetic shielding structure, by adopting a double electromagnetic shielding structure and an electrical insulation structure, thereby achieving good electromagnetic shielding performance and insulation protection performance, electromagnetic shielding and mechanical protection of the terminal and the cable, with the advantages of reliable structure, good electromagnetic shielding, and convenient maintenance. The product has passed the radio frequency sensitivity test of Class G equipment and the radio frequency radiation emission test of Class P equipment in RTCA / DG-160G "Airborne Equipment Environmental Conditions and Test Procedures", and has been verified by the test to meet the requirements of the harsh use environment. At the same time, due to the improvement of the electromagnetic compatibility of the product, the two electric pump assemblies of the left source and the right source are placed together on the aircraft, shortening the length of the hydraulic pipeline and the length of the cable connected on the aircraft, and improving the integration of the airborne equipment.

[0031] The above is only a specific embodiment of the present invention, and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention, should still fall within the scope of this patent. In addition, the technical features of the present invention can be freely combined with each other, with each other, and with each other.

Claims

1. An electromagnetic shielding structure for a high current terminal block, characterized in that: include: Cable (8) and terminal block (7); A cable protective layer, which is sleeved on the outer side of the cable (8); A protective cover (1) is fixedly arranged on the periphery of the wiring terminal (7), the protective cover (1) having a compartment, and the wiring terminal (7) is placed in the compartment; The wire nozzle (2) is arranged at the connection between the cable (8) and the wiring terminal (7), and the wire nozzle (2) is electrically overlapped and connected to the protective cover (1).

2. The electromagnetic shielding structure of a large current terminal block according to claim 1, characterized in that: The cable protection layer comprises a small insulating sleeve (3) which is sleeved on the outer layer of the cable (8).

3. The electromagnetic shielding structure of a large current terminal block according to claim 2, characterized in that: The cable protection layer also includes a wave-proof sleeve (4) which is sleeved on the outside of the small insulating sleeve (3).

4. The electromagnetic shielding structure of a large current terminal block according to claim 3, characterized in that: The cable protection layer also includes a shielding tape (5) wrapped around the outer surface of the wave-proof sleeve (4), and one end of the shielding tape (5) is wrapped around the overlapping boss of the wire mouth (2).

5. The electromagnetic shielding structure of a large current terminal block according to claim 4, characterized in that: The electromagnetic shielding structure of the high-current terminal block also includes a large insulating sleeve (6) which is sleeved on the outside of the shielding tape (5).

6. The electromagnetic shielding structure of a large current terminal block according to claim 5, characterized in that: The protective cover (1) is made of an electromagnetic shielding structural material, the outer surface of the protective cover (1) is provided with a coating layer resistant to corrosion, and the inner surface of the protective cover (1) is provided with an insulating paint layer.

7. The electromagnetic shielding structure of a large current terminal block according to claim 6, characterized in that: The wire passing nozzle (2) comprises a rectangular mounting flange and a circular overlapping boss connected in sequence, the wire passing nozzle (2) is provided with a circular wire passing hole along the axial direction, the outer surface of the wire passing nozzle (2) is provided with a coating layer resistant to corrosion environments, and the inner surface of the wire passing nozzle (2) is provided with an insulating paint layer.

8. The electromagnetic shielding structure of a large current terminal block according to claim 7, characterized in that: The wave-proof sleeve (4) is a metal sleeve woven from tinned copper wires; the shielding tape (5) is a copper wire woven square hole mesh; the small insulating sleeve (3) and the large insulating sleeve (6) are both heat-shrinkable electrical insulating sleeves.

9. The electromagnetic shielding structure of a large current terminal block according to any one of claims 1 to 8, characterized in that: The protective cover (1) comprises a plurality of compartments arranged at intervals, and each of the compartments corresponds to a wiring terminal (7).

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