SU792392A1 - Sealed lead-in of wires - Google Patents

Description

one

The invention relates to electrical engineering and can be used to seal the lead-in wires into the housing of the device, in particular, to devices intended for operation in seawater or in multiple contact connectors of marine design, having in its composition a cable harness.

A device is known for sealing, comprising a housing filled with a joint-sealing compound that has adhesion properties to the housing material and to the wire sheath material 1.

However, the known device has inherent drawbacks consisting in the technological complexity of obtaining a reliably sealed entry and arising in connection with the dependence of the design as a whole on the quality of adhesion of the casting mass to the sheath of each wire, as well as the difficulty of fixing the casting defects.

The closest in technical essence is a device for sealing, containing a housing filled with grease, windows covered with a rubber diaphragm, a board with contacts, to which wires placed in the cavity with grease are fed — the cores of the cable inserted into housing 21.

However, this device also has

5 disadvantages, in that if it is necessary to bring the wires out of the sealed enclosure into a conductive medium under pressure, it becomes unreliable due to the possibility of the penetration of the external environment into the cavity filled with grease and the subsequent closure of the wires.

The aim of the invention is to improve the reliability of the input wires in

15 conductive. medium under pressure.

The goal is achieved by the fact that the proposed sealed. cable entry containing the housing filled with grease and

A board located in the housing with contact elements and wires connected to them, is provided with a two-step arrangement along the wire with two holes along the wire with holes,

25 in which the wires are located, the housing is made in two stages, in each of the steps of which through the sealing elements the corresponding piston stages are located, with

Claims (1)

In this case, the end faces of the body and piston stages facing each other are arranged with a gap. FIG. 1 shows a device for sealing before starting work (in the absence of external pressure) a longitudinal section; in fig. 2 - device in the process of working under pressure; in fig. 3 - the final position of the device. Sealed inlet consists of body 1, in which a board 2 with current-carrying elements 3 is installed, to the shanks of which wires 4 are soldered, brought out of the body through holes 5 of the movable piston 6. The piston is installed in the body. Two cylindrical surfaces 7 and 8 of different diameter i.e. made of two stages and compacted on these surfaces with rings of elastic material 9 and 10, respectively. The ends of the steps of the piston casing 0 are installed with a gap forming the cavity 11, which is connected to the atmosphere by the opening 12. The mounting cavity in which the tailings of current-carrying elements with the ends of the wires attached to them are filled with grease 13 and closed with a stopper 14. The housing 1 is sealed in the bulkhead 15 separating the space exposed to the conductive medium (in Figs. 1, 2, 3 - from the right side of the bulkhead) from the space with atmospheric pressure. On the outer side of the housing is fixed ring 16, limiting the movement of the piston. The device for sealing works as follows. At the end of the electrical installation (soldering wires 4 to the shanks of current-carrying elements 3) and assembling the device, the mounting strips of the housing 1 are filled with grease 13. The appearance of grease from the holes 5 indicates that the cavity is filled, while the piston is being squeezed out of the housing prevents the collet 16. At the end of the filling, the mounting cavity is closed by the plug 14. When a pressure medium arises from the output side of the wires (indicated by the arrow P in Figs. 2 and 3), this pressure transmits through the openings 5 on grease 13 filled in the cavity of the mounting guide. Thus, the piston 6 turns out to be loaded with pressure P at both its ends, external and internal (facing the mounting cavity). Due to the difference in area of these ends, determined by the difference in diameters of the cylindrical surfaces 7 and 8, the resulting force of pressure starts to act on the piston in the direction of the mounting cavity. Under the influence of this force, the piston begins to move in the direction of the board 2, thus reducing the volume of the mounting cavity and cavity 11. Seals 9 and 10 prevent penetration into cavity 11, respectively, of lubricant 13 and the external environment, thus ensuring the freedom of movement of the piston and air outlet through the hole 12 to the atmosphere. By reducing the volume of the mounting cavity, the grease 13 begins to thicken, fill all the voids that could have remained when the cavity was filled, and then squeezed out into the gaps between the walls of the holes 5 and the wires 4 towards the external environment. Thus, the movement of the lubricant prevents the penetration of the external environment through the holes 5 into the mounting cavity and protects the wires from closing. The invention makes it possible to increase the reliability of sealing group entry of wires into an instrument case intended for operation in a conductive pressure medium (for example, in sea water). The invention also makes it possible to simplify the manufacturing technology of the device by eliminating the irreversible operations that take place during the pouring of electrical installation by polishing, self-folding, etc., sealing compounds. Claims Hermetic lead-in to an electrical device, for example, a plug-in connector containing a housing filled with grease and a board located in the housing with contact elements with wires attached to them, characterized in that it is equipped with a two-sided cable located on the side of the wires a piston with holes in which the wires are located, the housing is made two-stage in each of the steps of which through the sealing elements are located vukadie stage piston, wherein the mutually facing ends of the housing and the piston stages are located with clearance. Sources of information accepted by eo attention during the examination 1. Impregnation and casting of products of radio engineering and industrial engineering. RTM ONTI, 1961. 2. US Patent No. 3633155, cl. H 01 R 13/52, 1971. 12 f