RU2314586C2 - High-pressure current lead - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: proposed high-pressure current lead designed for use in pressure chambers to transfer electrical energy to enhanced-gas-pressure compartments as well as to provide communications and to receive medical instrumentation control data on diver's vital activity has plug and socket metal shrouds with threaded joints made in the form of hollow cylinders. Shrouds accommodate socket contact jacks and plug pins. All components are self-sealing parts having conical self-sealing and interacting junction surfaces pre-sealed at desired specific pressure by means of hold-down nuts and provided with sealing rubber rings.

EFFECT: enhanced reliability due to adequate sealing and high mechanical and electric strength at high gas pressure throughout entire specified service life.

1 cl, 1 dwg

Description

The invention relates to diving equipment devices for transmitting electricity through a housing into compartments with high pressure of the gas environment, as well as for communicating and receiving medical instrument control information about divers ’vital activity.

Currently, cable entries of decompression chambers are known, sealing of the cable entry in which is achieved by creating a specific compression pressure on the cable in the stuffing box seal, which exceeds the pressure of the gaseous medium in the chamber [1].

The disadvantage of these cable entries is the inability to control the amount of cable crimping in the stuffing box seal, which leads to a thinning of the rubber sheaths of the cable and, consequently, to a decrease in the electrical insulation resistance and subsequently to a short circuit of the cable conductors. This does not allow the use of these cable entries in pressure chambers with a working pressure of more than 1.0 MPa (10.0 kgf / cm ² ).

Cable glands of pressure chambers are also known, the sealing and insulation of electrical conductors in which is carried out by filling the internal cavities of the contact housings with various self-hardening polymer components, for example, an epoxy compound [2].

These current leads have significant drawbacks consisting in the uncontrolled adhesion quality of the polymer composition with metal and electrical insulating materials of the housings and conductors, in reducing the electrical insulation resistance of the conductors between themselves and the housing, and most importantly in the loss of tightness of the weakness of the sealing mass after an indefinite time as a result of its polymerization. In addition, such current leads are not subject to disassembly and restoration.

These shortcomings can lead to depressurization of the pressure chamber, and therefore to an uncontrolled decrease in the pressure of the gas medium in it, which is dangerous for the life of divers. In addition, a decrease in the electrical resistance of the insulation of the current lead can cause a short circuit in the electrical circuits and their failure, and also injure people.

The objective of the invention is to ensure the reliability of the current lead by maintaining its tightness, mechanical and electrical strength at elevated pressure of the gaseous medium for a specified service life, as well as ensuring its maintainability.

This task is achieved in that the current lead parts are self-sealing with conical interacting connecting surfaces, pre-sealed with clamping nuts, and equipped with rubber o-rings, and the sealing contact housings are arranged in series, forming a double lock.

The drawing shows a General view of the high pressure current lead.

The housing 1 of the socket and the housing 2 of the plug are threaded and sealed with a rubber O-ring 3. In the internal cavities of the housings 1 and 2 are contact housing 4, respectively, sockets and plugs (made of electrical insulation materials, such as hard rubber or textolite), which are pressed nuts 5 are pressed by conical sealing surfaces to similar surfaces of housings 1 and 2. Rubber contact rings 6 are installed on contact housings 4. In cylindrical contact sockets 4 orpusov sockets and plugs are mounted respectively outlet socket 7 and the plug pins 8, also having a conical sealing surfaces which are pressed against the tapered sealing surfaces of its contact housings nuts 9. Jacks 7 sockets and plug pins 8 are sealing rings 10.

The nuts 9 to the sockets 7 of the socket and the nuts 11 to the pins 8 of the plug are used to fasten the ends of the current-carrying cable cores 12. The assembled housing of the socket 1 and the plug 2 are installed in the cavity of the glass 13 welded into the opening of the pressure chamber 14 and are pressed against it with threaded rods with nuts 15 through the flange 16 and are sealed with a red-copper gasket 17, as well as rubber o-rings 18.

The proposed current lead, in which the sealing contact housing assemblies are arranged in series, forming a double lock, will ensure the tightness of the pressure chambers at high (up to 5.0 MPa) pressure of any gas respiratory medium, as well as the reliability and safety of the transmission of electricity to the pressure chambers and the stability of maintaining communication with divers.

The manufacture of the proposed current lead and its subsequent frill are not difficult. Compared with the specified analogues, the proposed current lead is maintainable during its long-term operation.

Information sources

1. Germovvod damn. KTTYu. 362676. 685 SB.

2. USSR copyright certificate No. 1312650, class. HB01 17/26, 1987.

Claims (1)

A high pressure current lead comprising metal socket housings and threaded plugs made in the form of hollow cylinders, contact housings installed in the internal cavities of the housings with socket receptacles and plug pins, characterized in that its parts are self-sealing with conical connecting surfaces that interact with each other, pre-sealed with the required specific pressure by means of clamping nuts, and equipped with rubber o-rings.