RU2529423C2 - Coupling device - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention relates to the coupling device for screening cable wires and switched electronic devices from electromagnetic radiation. The coupling device contains a body, cable with wires with partially dissociated screening braidings, electrical conduit consisting of a tail part and a connective part, through which the above mentioned wires run to the housing, flexible-rigid printed-circuit board located inside the connective part of the conduit. On the internal part of the flexible-rigid printed-circuit board the copper layer with the formed bonding contact pads is designed, and on its external side - copper layer with the formed ranges, which are connected to by strengtheners, connected with screening braidings. Wire ends separated from screening braidings, are located inside the space, confined by the flexible-rigid printed-circuit board.

EFFECT: improvement of reliability and maintainability of the device.

7 cl, 6 dwg

Description

The invention relates to the field of electrical engineering and electronics, in particular to the volumetric installation of conductors in shanks of connectors designed for mechanical and electrical connection of DC and AC circuits. The device is designed to provide shielding of signal circuits in electronic equipment operated in difficult climatic conditions in various fields of application, including aviation and space.

It is known that due to the increase in operating frequencies during the transmission of information signals, the requirements for ensuring electromagnetic compatibility (EMC) to devices have been significantly tightened. Existing design options for electrical connectors contain removable parts and components necessary for maintenance, the presence of which adversely affects the EMC of adjacent electronic devices. To provide EMC electronic equipment that uses electrical connectors, the design of the latter must be protected from the penetration of electromagnetic waves.

Known modular system for interconnecting wiring harnesses in a grounded environment (US 5308264, H01R13 / 516, H01R13 / 658, H01R9 / 03, H01R31 / 06, publ. 05/03/1994), which is an assembly that contains a wiring harness module and a casing module equipped with means for connecting wires to electrical equipment installed in the aircraft mounting rack and shielded from external electromagnetic radiation. The mounting harness module includes a mounting harness, which has a braid that shields from external electromagnetic radiation, and many individual wires that are protected from inter-wire electromagnetic radiation by means of individual braids. The grounded casing module and the mounting harness module contain at least one pin and at least one female connector for connecting the wires of the incoming cable to the conductors transmitting signals in the modular system. At least one flexible-rigid printed circuit board is located in the grounded casing module, which contains internal shielded conductors that are electrically connected at one end with the pin connector of the grounded casing module, and at the other end with signal transmitting means. The design of the analogue is made in such a way that when connecting the mounting harness to the terminals of the mounting harness module, the section of wires freed from the individual shielding braid remains minimal.

A disadvantage of the analogue is that the casing module and the mounting harness module contain female and output connectors, respectively, which are redundant for switching. This increases the length of the connection between the casing module and the mounting harness module, its ohmic resistance and, accordingly, the heating of the structure. In addition, the maintenance or repair of the contact part is carried out by replacing the flex-rigid printed circuit board, which increases the cost of servicing the modular interconnect system of the mounting harnesses in general, since replacing the flex-rigid printed circuit board is possible only at the manufacturer or a specialized repair enterprise , and under operating conditions is not possible.

The closest technical solution (prototype) is a connecting device (RU 2121740, H01R32 / 68, H01R13 / 66, publ. 10.11.1998), consisting of contact, connecting and tail parts, grounded to external grounded equipment.

The tail section is a casing forming a conduit through which a cable in the form of a bundle of wires with individual shielding braids passes into the connecting part. A grounding ring has been introduced into the design of the tail part, which surrounds the wires, and the grounding ring is telescopically inserted into the casing and between the individual shielding braids of the wires to ground it to the casing, an internal clamping ring that is telescopically inserted over the grounding ring and over the individual shielding braids to press them to the grounding ring, and a tension-optimizing element that spans a cable consisting of a bundle of wires. Through one of the walls of the conduit, the wires pass into the connecting part, and are connected there with at least one flexible-rigid printed circuit board. Further, with a flexible-rigid printed circuit board, the wires are connected to the contact group. One of the walls is equipped with an access hole having a size that allows flexible-rigid printed circuit boards to enter and change in the connecting part, which allows reassigning the conductors inside the cable.

In addition to the disadvantages inherent in the above analogue, the disadvantage of the prototype is that due to the use of clamping rings, there is constant pressure on the individual shielding braids, deformation of their conductors, which can lead to breaking (damage) of the latter. The use of only one wall with a hole in the connector housing for servicing the product does not provide full access to serviced or replaced elements. In the area of the connecting device available for maintenance, there is no inter-wire shielding of the circuits, and therefore, to ensure EMC, it is necessary to reduce this area, which will further limit access for maintenance.

In addition, due to the low thermal conductivity of the air and the absence of its movement in the closed volume of the support body, the air gap between the contacts of the flexible-rigid printed circuit boards does not provide heat transfer from their contacts and prevents their overheating.

The technical result of the invention is the provision of shielding of cable wires and switched electronic devices from electromagnetic radiation and, as a result, improving the reliability of the connecting device as a whole.

The technical result is achieved by the fact that the connecting device comprises a housing, a cable containing wires with shielding braids, the ends of which are separated from them, a conduit consisting of a tail and a connecting part through which wires with shielding braids are led to the housing, a flexible-rigid printed circuit board and differs in that the flexible-rigid printed circuit board is located inside the connecting part of the conduit, on the inner side of the flexible-rigid printed circuit board there is a layer of copper in which con stroke areas, on the outside of the flexible-rigid printed circuit board a copper layer is made in which polygons are formed, to which reinforcers are attached, connected to shielding braids separated from wires, and the ends of wires separated from shielding braids are located inside a space limited by flex hard pcb.

Moreover, in the tail of the conduit, a seal is made of an electrically conductive elastic material.

In this case, a sleeve of elastic material is installed inside the flexible-rigid printed circuit board.

In this case, the inner space of the connecting part is filled with an insulating compound.

In this case, the tail part and the connecting part have electrical insulation coatings.

In this case, the tail part and the connecting part have electrically conductive coatings.

At the same time, radio elements are installed on the pads of the flex-rigid printed circuit board, and the ends of at least two wires separated from the shielding braids are connected to the pads of the flex-rigid printed circuit board.

The described technical solution is presented in the drawings:

Figure 1 - External view of the connecting device;

Figure 2 - Connection device in section;

Figure 3 - Flexible-rigid circuit board;

Figure 4 - Connecting device in isometry;

Figure 5 - The location of the wires inside the flexible-rigid printed circuit board;

6 - The location of the wires inside and outside the flexible-rigid printed circuit board;

where the following notation is given:

1 - case

2 - tail

3 - connecting part

4 - cable

5 - wire

6 - shielding braid wire 5

7 - flexible-rigid printed circuit board (GZHPP)

8 - the end of the wire 5, separated from the shielding braid 6

9 - contact

10 - polygon

11 - hardener

12 - brazed braided joint with hardeners 11

13 - radio element

14 - contact area

15 - soldered connection of the wire with the contact pad 14

16 - seal

17 - sleeve.

The connecting device includes a housing 1, the tail and connecting parts 2 and 3, respectively (Fig. 1, 2), forming a conduit and having electrically conductive (for example, KhimN12) or insulating (for example, An.Ox.) Coatings, cable 4, in which at least two wires 5 with shielding braids 6, GZHPP 7.

The tail and connecting parts, 2 and 3, respectively, and the housing 1 are connected by threaded connections (not shown). The ends 8 of the wires 5, separated from the shielding braids 6, are drawn through the connecting part 3 to the GLCP 7, and then connected to the contacts 9 of the housing 1.

ГЖПП 7 is made in the form of, for example, a cylinder and is located in the connecting part 3 (Fig. 3). A copper layer is made on the outside of the GLCP 7, which is covered with an insulating material, for example, a solder mask CARAPACE EMP 110/1615/2010 LGM (not shown), in which polygons 10 are formed. Hardeners 11 in the form of plates made of solderable material, for example brass L63 GOST 2208-2007, soldered to landfills 10. Shielding braids 6 wires 5 are connected to hardeners 11 by solder connection 12.

On the inner side of the GLCP 7 there are electrically conductive tracks with contact pads (not shown) on which radio elements 13 can be installed, for example, terminating resistors, as well as contact pads 14 for connecting to the ends 8 of the wires 5 separated from the shielding braids 6 by soldering connection 15.

The ends 8 of the wires 5, separated from the shielding braids 6, are located inside the space bounded by GZHPP 7.

Part of the wires 5 can be located between the outer surface of the GLCP 7 and the inner surface of the connecting part 3 (Fig. 5, 6).

At the outlet of the cable 4 from the tail part 2, a seal 16 is made of an electrically conductive elastic material, for example EXCSR-1270-CS rubber, which is in contact with shielding braids 6. A sleeve 17 made of an elastic material, for example, IRP-1338 rubber, is installed inside the GLCP 7 NTA TU38.105-1959-90 (Fig. 3).

The internal volume of the connecting part 3 is filled with an insulating maintainable compound (for example, Vixint PK-68 TU38.103508-81).

The housing 1, the tail portion 2 and the connecting portion 3 may constitute a unipolar connection, in which both the housing 1 and the tail portion 2 and the connecting portion 3 have the same electrical potential. In this case, the connecting device is grounded through the housing 1 to the housing of the electronic device (not shown) or through the connecting part 3 or the tail part 2 to the shielding braids 6 of the wires 5. If the housing 1, the tail part 2 and the connecting part 3 are electrically isolated from each other, This connection device is used without grounding.

Depending on the purpose of the connecting device, for example, when prohibiting the use of housings with conductive coatings, the housing 1, the tail part 2 and the connecting part 3 can be either electrically insulated and double shielded ends of 8 wires 5 separated from the shielding braids will be provided 6, while the first screen is formed by GLCP 7, shielding braids 6 and seal 16, and the second screen is the tail and connecting parts, 2 and 3, respectively.

If it is necessary to use housings with conductive coatings, for example, in which the grounding of the connecting device is made by connecting to the housing of the electronic device, the housing 1, the tail part 2 and the connecting part 3 are made with an electrically conductive coating and electrical connection with shielding braids 6, which also provides double shielding, while the first and second screens are connected to each other.

The device operates as follows.

When switching electronic devices, electromagnetic interference occurs, the source of which is the ends of 8 wires 5 separated from the shielding braids 6. The wires 5 located inside the cable 4 are shielded from external and inter-wire electromagnetic radiation using shielding braids 6.

Starting from the cutting area of the shielding braids 6 and to the contacts 9, the shielding of the ends 8 of the wires 5, separated from the shielding braids 6, is provided by the GLPP 7. The copper layer of the GLPP 7 is an effective screen (D. Shapiro, “Electromagnetic shielding,” Scientific publication, Intellect Publishing House, Dolgoprudny, 2010, pp. 28-33).

Electromagnetic radiation from the ends of 8 wires 5, separated from the shielding braids 6, propagates in the inner space bounded by the GLCP 7, is repeatedly reflected and absorbed by the materials of the GLCP 7, hardeners 11 and seals 16. Due to the small size of the cracks and holes formed when cutting the wires 5 with side of the seal 16, the propagation of electromagnetic waves into the outer space near the tail part 2 is negligible.

When carrying out maintenance or repair of the connecting device, the tail part 2 is unscrewed and displaced along the cable 4 to the side of the housing 1. Then, the connecting part 3, which also moves along the cable 4 in the same direction, is unscrewed. As a result, free access to the GLP 7 and contacts 9 is ensured. The compound is removed from the GLP 7 7 mechanically using, for example, a medical scalpel, a metal needle 7800-9320 and a pointed wooden stick, as a result of which free access to the radio elements 14 is provided.

Thanks to the proposed technical solution, in all possible cases, double shielding of the ends of the cable wires is provided, separated from the shielding braid.

The connection of the shielding braids with the outer layer of the GLCP using a soldered connection provides shielding of the cable wires in the inner space bounded by the GLCP.

Between the outer surface of the GLCP and the inner surface of the connecting part, a volume (compartment) is formed through which both shielded wires and the ends of the wires can be separated from the shielding braids. In this case, the conductors of the inner layer of the GSPP are shielded by the GSP from the wires located between the outer surface of the GSP and the connecting part.

The solder connection of the shielding braids with hardeners ensures the absence of mechanical stresses in the wires and shielding braids, which eliminates their deformation and destruction during assembly of the connecting device.

Installation of a sleeve made of an elastic material eliminates the contact of adjacent conductors.

Due to the filling of the internal volume of the connecting part with the insulating compound with the GGPP and the ends of the wires separated from the shielding braids, the mechanical strength of the connecting device is increased.

The proposed design of the connecting device provides the possibility of its maintenance during operation, as well as its repair.

Thus, the connecting device containing the proposed technical solution is more reliable than existing analogues.

As a result of the application of the proposed connecting device in electronic equipment, the cable wires and the switched electronic devices are shielded from electromagnetic radiation and, as a result, the reliability is improved and the maintainability of the connecting device is ensured.

Claims (7)

1. A connecting device comprising a housing, a cable containing wires with shielding braids, the ends of which are separated from the wires, a conduit consisting of a tail portion and a connecting part through which wires with shielding braids are led to the housing, a flexible-rigid printed circuit board, characterized in that the flexible-rigid printed circuit board is located inside the connecting part of the conduit, on the inner side of the flexible-rigid printed circuit board there is a copper layer in which the contact pads are formed, on the outer side ONET flex-rigid circuit board layer made of copper, in which the polygons are formed, which are attached strengtheners connected to shielding braids, separated from the wires, and the ends of wires separated from the shielding braids, are arranged inside the space defined by flex-rigid printed circuit board. 2. The connecting device according to claim 1, characterized in that in the rear part of the conduit a seal is made of an electrically conductive elastic conduit, a seal is made of an electrically conductive elastic material. 3. The connecting device according to claim 2, characterized in that a sleeve of elastic material is installed inside the flexible-rigid printed circuit board. 4. The connecting device according to claim 3, characterized in that the inner space of the connecting part is filled with an insulating compound. 5. The connecting device according to claim 4, characterized in that the housing, the tail part and the connecting part have electrical insulation coatings. 6. The connecting device according to claim 4, characterized in that the housing, the tail part and the connecting part have electrically conductive coatings. 7. The connecting device according to claim 5 or 6, characterized in that radio elements are installed on the contact pads of the flexible-rigid printed circuit board, and the ends of at least two wires separated from the shielding braids are connected to the contact areas of the flexible-rigid printed circuit board .

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