Sealed electric connector

FIELD: electrical engineering.

SUBSTANCE: sealed electric connector contains a cable terminal, a receptacle, a swivel nut and two bushings with conic surfaces for fixation of the logging cable armature; the cable terminal is designed to be composite, consisting of an upper and a lower bodies, thread-connected. The swivel nut and the two bushings with conic surfaces are attached in the upper body upper part wherein boring is done for installation of a thrust washer and sealing elements. On the external conic bushing a facet is made, the thrust washer made of a metal less hard than the cable armature wire. In the lower body an insulator-confined contact is positioned whereon the bushing is fitted that protects against breakdown and serves as the support assimilating the force of coupling with the receptacle. The socket is designed to be removable and represents a body wherein a female contact and a shank are pressed-in, on one side and on the other side respectively, the contact and the shank forming a sealed lead-in. The bushing, insulator and sealed lead-in are interfaced in a stepped manner. The receptacles is mechanically connected to the body with the help of the swivel nut.

EFFECT: invention ensures high tightness of the connector under high pressure.

2 cl, 2 dwg

 

The invention relates to electrical engineering, and in particular to devices used during geophysical surveys of wells, and to control the parameters in the working wells, and is intended for electrical and mechanical connection logging cable with downhole tools.

Known cable lug (RF patent for useful model №38355 from 23.07.02 g), contains a cap and two conical surfaces for fixing the carrying armor, sealing element, the connecting bridge, building and chocolatprincess the drive sleeve locking device has a double-sided cone.

The disadvantages of this device are the complexity of the design, which does not provide sufficient protection of the cable from twisting. In addition, this design features a fairly large length, which limits its use. Reduced reliability of the device and of the device, since the seal seals inevitably leads to the ingress of formation fluids into the unit and cause malfunction due to the circuit conductor parts on the body. In the case of leaking joints mate with the housing unit, the liquid will get and also inside the unit and will result in failure of the device.

Closest to the claimed invention is a cable lug is artigny type NC (TU 41-03-730-82), comprising a housing, in which is fixed to the outlet of electrocoagulated, by means of which the electric circuit of the downhole tool is connected to the cable. In the bottom of the body are electrical sensors, which are connected with the outlet of electrocoagulated using conductors. The electrical sensors are protected from mechanical damage by glass, which is screwed onto the housing and is fixed on the housing lock washer. In the upper part of the glass is the cable clamp.

The main disadvantage of this technical solution is that the Assembly and disassembly of the tip is provided with a rigid connection and mutual fixation of the node cable clamp to the housing of the handpiece, which include electrical sensors. This leads to the twisting and bending of the wires of the cable and, consequently, to the breaking lived in places soldering and disturbance isolation of electrical sensors. Sealing and insulation of electrical sensors, are soldered to the cable conductors, is made by means of an insulating tape, which is applied manually with a simultaneous coating of the adhesive composition. Because of imperfections in this process there is a partial breaking of the wires of the cable in the soldering joints. For connecting the wires of the cable to the socket of electrocoagulated intermediate conductors, the length of which is chosen by a large margin, as the socket installed is deep inside the body of the handpiece. When installing the outlet conductors are subjected to repeated bending, which leads to their breaking of the soldering joints. Mount the cable clamp in the glass with a screw complicates the Assembly process and especially after disassembly operation in the well.

The objective of the invention is to improve the reliability hermetic electrical connector, ensuring its integrity at high pressure and small size in diameter and length.

The technical result is achieved in that in a sealed electrical connector containing a cable tip, socket, cap nut and the two conical surfaces for fixing the logging cable armor, cable lug made of composite, United by the thread of the upper and lower body. While bolting and two conical surfaces are attached to the upper part of the upper body, which carried out the bore to install the thrust washers and seals. On the outer tapered sleeve is made chamfer, and thrust washer is made of metal with a lower hardness than the wire armor cable. In the lower body is pin contact insulator on which the wear sleeve, protects against breakdown and serves as a stop perceiving the force of coupling with the socket. Socket issue is Lana removable in the form of housing, in which are pressed from one side of the socket and shank, forming a hermetical input. The coupling sleeve, the insulator and the inlet is screwed performed stepwise. Socket with cable lug mechanically connect with the Union nut. Hermetic electrical connector includes a dielectric fluid that fills the inner cavity of the socket and the cable lug in the upper housing which is located the valve to remove air when entering the dielectric fluid. The diameter of the cap nut 23 mm, and its length is not more than 95 mm

1 shows a cable lug, General view; figure 2 is sealed electrical connector Assembly section.

Structurally sealed electrical connector includes a cable lug and socket. Cable tip is made of a composite of the top 1 and bottom 2 of the housing (see figure 1 and 2), which are connected by threads. In the upper part of the upper housing 1 are fasteners armor logging cable 3 - twin tapered bushing inner 4 and outer 5, and thrust washer 6, which by means of the Union nut 7 is fastened to the upper part of the upper housing 1. In the bore 8 are sealing elements 9 (ring or cuff), which seal the cable conductor 3. The proposed construction of the mount armor KAB is La 3 and the preliminary deformation of the sealing elements 9 are locking nut 7. In the process of tightening the Union nut 7 sealing elements 9 tightly compresses the core of the cable 3 and fixed relative to the upper housing 1. To avoid twisting of the cable conductor 3, the cable itself and the parts 4, 5, 6 needed when tightening the Union nut 7 to remain stationary relative to the upper housing 1 and the cap nut 7 should slip on the outer sleeve 5. For this purpose, the outer tapered sleeve 5 is made chamfer 10, which reduces the shoulder of the moment of friction force, and therefore the moment of friction force between the locking nut 7 and the outer tapered sleeve 5 in comparison with the moment of friction force between the upper housing 1 and the thrust washer 6. To avoid slippage of the inner tapered sleeve 4 and the thrust washer 6, the material of the thrust washer 6 is selected so that the wire armor logging cable 3 when tightening the Union nut 7 is pressed into the surface of the thrust washer 6. Because of the conical sleeve 4 and 5 are in contact tapered surfaces, the pressure on these surfaces, and, consequently, the frictional force between them will greatly exceed the pressure and the friction force between the locking nut 7 and the outer tapered sleeve 5 (the more, the smaller the angle of the cone), that approximates the shoulders of these forces gives the same ratio and their moments.

The conductive core geophysical ka is El 3 is connected to the pin contact 11, which is installed in the insulator 12, and the connection cable conductor 3 and the pin contact 11 of the wear sleeve 13 of insulating material, and the whole design is located in the lower body 2. The sleeve 13, during the soldering pin contact 11, is placed in the bore 14 of the upper shell 1, and after soldering is put on the insulator 12 and a thread connected to the upper housing 1. This sleeve 13 protects the solder joints from accidental short circuits on the housing of the cable tip, as well as through manual pairing with an insulator 12 increases the path length of the leakage current and prevents breakdown at high voltages. The sleeve 13 also serves as a stop perceiving the force of coupling with the socket, due to the threaded connection with the upper housing 1.

At the junction of the upper and lower housings 1 and 2 establish sealing elements 15. Union nut 16 serves for the mechanical connection of the cable lug and the wall outlet, and for sealing the connection establish sealing elements 17.

The socket is made in the form of a casing 18, which is pressed from one side of the socket 20 and the shank 21 for connection with the wires of the device (not shown), which is a hermetical input 19 (a utility model patent of the Russian Federation No. 42703 from 02.08.2004,). The mating surfaces of the inlet is screwed with 19 isolation also performed stepwise, which increases the path length of the leakage current, preventing breakdown at high voltages. For sealing the connection socket from the housing unit is provided sealing elements 22.

The inner cavity of the cable lug after Assembly is filled with a dielectric fluid through the gaps between the lower case 2 and the insulator 12 pin contact 11, and the air is expelled through the valve 23 located in the upper housing 1, after filling valve 23 is closed. Before joining the deepening of the outlet-side coupling fill dielectric fluid, is then inserted into the cable lug open valve 23, through which overlook the excess dielectric liquid, and tighten the cap nut 16, and the valve 23 is closed. The filling of the cable lug of the dielectric fluid in conjunction with the use of sealed sockets allows to increase the reliability of the instrument, so as to leak the internal cavity of the cable lug will not lead to failure of the device. Dielectric fluid practically does not change the volume when the pressure increases (unlike air) and, in the case of depressurization, prevents the penetration of the reservoir fluid into the internal cavity of the cable lug that prevents the closure of the live parts on the body, is that what are the equalization of pressure in the inner cavity of the connector with the environment.

The advantage of this hermetic electrical connector are small size in diameter, the diameter of the cap nut 16 is 23 mm vs. 36 mm minimum diameter of cable lugs and heads of probes according to GOST 14213-89, and a diameter of 28 mm and at least lugs cable type NC on TU 41-03-730-82. The length of the sealed electrical connector Assembly is 95 mm, this is achieved by placing the seal cable conductor immediately after the fastening elements of the armor of the cable, run the cable housing of the handpiece compound. Small size hermetic electrical connector can be used in confined dimensions, for example, in devices, through which the motor shaft or with the channel (set in the context of the tubing string).

1. Hermetic electrical connector containing a cable tip, socket, cap nut and the two conical surfaces for fixing armor logging cable, wherein the cable tip made of composite United by the thread of the upper and lower housings, with Union nut and two conical surfaces are attached to the upper part of the upper body, which made the hole to install the thrust washers and sealing elements, external to what usnei sleeve made chamfer, and thrust washer is made of metal with a lower hardness than the wire armor cable in the lower body is pin contact insulator on which the wear sleeve, protects against breakdown and serves as a stop perceiving the force of coupling with the socket, is made removable, in the form of a casing, in which are pressed from one side of the socket and shank, forming a hermetical input pair bushing, insulator and inlet is screwed performed stepwise, socket with cable tip is mechanically connected by means of a Union nut.

2. Sealed electrical connector according to claim 1, characterized in that it contains dielectric fluid that fills the inner cavity of the socket and the cable lug in the upper housing which is located the valve to remove air when entering the dielectric fluid.



 

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