JPH08287999A - Cable plug-in port structure for underwater equipment - Google Patents

Abstract

PURPOSE: To provide a cable plug-in port structure for underwater equipment, which excels in operability and in which water-proof treatment can be surely performed. CONSTITUTION: A spherical insulating material 15 is inserted so that a plurality of cable conductors 3a from a cable 1 side are disposed between a plurality of cable conductors 3b from underwater equipment side and a water-proof metal connection part 6 in parallel to the metal connection part 6 at an equal interval. The cable conductors 3 are fixed to a plug-in port by a resin filler 13 so as to contain the spherical insulating material and the metal connection part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cable insertion port of an underwater equipment such as a dry submersible motor.

[0002]

2. Description of the Related Art When operating an electric device such as a submersible motor underwater, it is necessary to connect a power or control cable from the land to the inside of the electric device through an insertion port. The insertion port requires the utmost care and the highest reliability in order to prevent water from entering. As a sealing method for this portion, (1) a mold structure using an elastic body such as rubber, (2) a sealing structure using resin, etc. are generally adopted.

In addition, a cable is usually formed by twisting a large number of fine wires to form a single core wire, and several core wires that have been insulation-coated are further twisted together, and the outer sheath is covered on the core wire to form a single cable. I am configuring. Therefore, one core wire is made up of a large number of fine wires, and there are minute gaps between them, so that there is a risk that moisture may enter the motor through the cable from the land side cable end due to the capillary phenomenon. is there. Therefore, it is necessary to block air from flowing in the middle of the cable cores, prevent moisture on the land side from entering the motor, and connect the cores to each other by a metal for electrical conduction. Therefore, so-called draining treatment is performed. The draining process is performed by inserting the cable core wire and the core wire on the underwater equipment side from both sides of the metal sleeve, and fusing the tip ends of the metal sleeves with, for example, solder to form a metal connection portion and shut off air from flowing. Thus, the flow of water due to the capillary phenomenon is prevented. In the case of a multi-core cable, it is necessary to perform insulation and sealing work so that the metal connection parts do not come into contact with each other in the cable mold or the shield structure made of resin.

In the conventional insulation and sealing work of the metal connection portion, (1) an adhesive is applied to the metal connection portion of each core wire, and insulation is performed by a heat shrinkable tube or the like. (2) Insert an insulating member such as a rubber plate between the metal connecting portions of each core wire. Further, a molding material or a resin is filled on the outer side thereof to perform sealing.

FIG. 4 shows a conventional method in which an adhesive is applied to a metal connecting portion and insulation is performed by a heat shrinkable tube. The insulators of the cable 1 and the core wire 3a of the motor side terminal are removed, and the conductors 4a and 4b at the tips of the core wires 3a and 3b in the crimp sleeve 6 are removed.
Solder 5 is poured in between to perform drainage treatment. After that, the adhesive 7 is applied to the drained connection portion 6 and the conductors of the core wires 3 a and 3 b, and the heat-shrinkable tube 8 insulates. Further, the metal connecting portion 6 is inserted into the insertion port of the housing 2, and the rubber packing 9 is compressed by the washer 10 and the gland 11 to fix the cable 1. Then, the plurality of core wires 3b protruding outside the gland 11 are bundled by the band 12, the connection part 6 is positioned, and the resin 13 is poured into the insertion port in the gland 11 and cured.

FIGS. 5 to 7 show another conventional example in which an insulating member such as a rubber plate is inserted between the connecting portions of the respective core wires, and the heat shrinkable tube 8 is replaced by the insulating treatment between the metal connecting portions. In addition, the illustrated insulating member 14 having a special shape such as a rubber plate is used.

In this structure, it is necessary to prepare the insulating member 14 having a special shape having various plate thicknesses depending on the cable size and to use them in combination depending on the number of cable cores. Further, if the number of cable cores is large (5 or more), it becomes difficult to combine the plate-shaped insulating members. Further, during the sealing work by filling the resin, air may remain in a complicated and narrow portion between these insulating members, and the cutoff of the air flow may be incomplete.

[0008]

In summary, in the case of the conventional example shown in FIG. 4, if the seal between the metal connection portion and the heat shrink tube is not surely performed, the inside of the land and dry submersible motor will be described. Air communicates with the inside of the cable,
The meaning of draining is lost.

Further, in the case of the conventional example shown in FIGS. 5 to 7, it is necessary to prepare an insulating member of a special shape having various plate thicknesses depending on the cable size and to use it in combination according to the number of cable cores and the cable size. Since it has to be done, the work becomes complicated. Further, when the resin is filled, if air remains in a complicated and narrow portion between these insulating members, there is a possibility that the above-mentioned draining process may be incomplete.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a cable insertion structure for an underwater device which has good workability and can reliably perform draining treatment.

[0011]

A cable insertion structure for underwater equipment according to the present invention has a plurality of core wires from the cable side, between the plurality of core wires from the underwater equipment side and a drained metal connecting portion. A spherical insulating material is inserted so that the metal connecting portions are arranged in parallel and at equal intervals, and the spherical insulating material and the metal connecting portion are fixed to the insertion port by resin filling so as to include them. And

[0012]

[Function] By inserting a spherical insulator into the central portion of a plurality of metal connecting portions of the core wire between the cable side and the underwater equipment side, bundling the core wires on the outside thereof, and filling the resin with each other, the respective metal connecting portions are connected. They can be placed in parallel and at equal intervals to insulate and seal. Since the insulating material that supports the connecting portion of the cable core is spherical, the gap between the resin-filled portions has a simple shape, which facilitates complete sealing without air remaining. Therefore, unlike the conventional example, air does not remain in the narrow portion between the insulating members during the sealing work and the draining process is not incomplete. That is, since the complete draining process can be performed by a simple work of inserting a simple spherical insulator between the metal connecting portions of the core wires, workability is improved.

[0013]

FIG. 1 is a vertical sectional view of a cable insertion structure of an embodiment of the present invention, and FIG. 2 is a sectional view of a surface where a spherical insulator is arranged, the surface being perpendicular to the axis. FIG. 3 is a perspective view of a state in which the spherical insulator is inserted between the connecting portions of the core wires. In this embodiment, the tips 4a of the four core wires 3a of the cable 1 are
The insulating coating is peeled off and the sleeve is inserted into the metal sleeve 6. On the other hand, the tip portion 4b of the core wire 3b on the submersible motor side
Also, the insulating coating is peeled off and the sleeve 6 is inserted. The tip portions 4a and 4b of the respective core wires are mutually fused in the sleeve 6 by the solder 5 which is melted and solidified. That is, in one sleeve 6, a gap between core wires formed by twisting a large number of thin wires is cut off by the solder fusion bonding portion 5 so that air does not completely flow, and metal draining treatment is performed. ing.

The four core wires 3a project from the cable 1 side, but a spherical insulator 15 for insulating and separating the four metal wires 3a is inserted between the metal connecting portions in the central portion. The spherical insulator 15 is a glass ball or a ceramic ball having high heat resistance and insulating properties, and in this embodiment, a spherical body having a diameter of about 5 to 15 mm is used. Before being fixed by resin filling, the underwater motor side of the core wire 3b is attached to the band 12 such as rubber.
The metal connection portions 6 are held in parallel around the spherical insulator 15 at equal intervals by bundling with. Then, the metal connection portion 6 of each core wire and the spherical insulator 15 arranged in the center portion of these are fixed by the filling resin 13 to substantially the center portion of the insertion port of the ground 11. The filling resin 13 is, for example, an epoxy resin, and completely prevents moisture from entering from the cable side to the underwater motor side.

A point contact is made between the spherical insulator 15 and the pressure-bonding sleeve 6 of the metal connecting portion, and unlike the conventional example, a complicated and narrow gap portion is hardly formed. Therefore, when the resin is filled, there is no remaining air,
Complete draining is possible.

The gland 11 including the connecting portion between the resin-filled cable in the insertion port and the core wire on the submersible motor side pushes the packing 9 and the washer 10 into the housing 2 and the screw 1
It is fixed by 7. As a result, the periphery of the cable jacket 1 is sealed with the packing 9. The housing 2 is fixed to the casing 18 of the submersible motor with screws 19.
The core wire 3b on the submersible motor side is connected to a lead wire of the submersible motor at a portion not shown.

Next, a method of manufacturing this cable insertion structure will be described. First, the cable 1 is cut, the cable jacket is opened, and the four core wires 3a are taken out. Then, the insulator of the core wire 3a is removed and exposed, the tip portion 4a is inserted into the crimp sleeve 6, the crimp sleeve 6 is crushed by compression from the outside, and the tip portion 4a is fixed to the crimp sleeve 6. Then, a solder piece is inserted from the opposite side of the crimping sleeve 6 and heated to melt the solder 5 in the central portion of the sleeve 6 to form a partition wall. Similarly, the tip end 4b of the core wire on the pump side is exposed and inserted into the sleeve 6, and the crimp sleeve 6 is crushed by compression from the outside to fix the tip portion 4b to the crimp sleeve 6. As a result, complete metal draining is performed in the sleeve 6. Next, insert the rubber packing 9, insert the washer 10 and use the screw 17 to attach the gland 1
1 is fixed to the housing 2. At the connection end of the cable 1, moisture is prevented from entering by the rubber packing. afterwards,
The spherical insulator 15 is inserted in the central portion between the four metal draining connection portions. Then, by tying the pump side with a rubber band or the like, the connecting portions 6 of the core wires 3a and 3b are arranged in parallel around the spherical insulator 15 at equal intervals. Then, the metal connecting portion 6 and the spherical insulator 15 are arranged at the center of the insertion port of the ground 11 so as to include them all, and a resin 13 such as an epoxy resin is filled therein. As described above, since each connecting portion 6 is supported at the point of the spherical insulator 15, the resin 13 is spread and filled so as to completely fill the gap. The housing 2 is fixed to the motor casing 18.

In the embodiment of the present invention described above, two spherical insulators 15 are used on both sides of the metal connecting portion 6, but one spherical insulator may be used, and the same effect is produced. Further, in the above embodiment, an example in which this cable insertion structure is applied to the casing of the submersible motor pump has been described, but it goes without saying that it can be used as a connector for various equipment used underwater as well as the submersible motor. .

[0019]

According to the conventional molding material or resin insulation structure, an adhesive is applied to the metal connection portion and insulated by a heat shrinkable tube or an insulating member such as a rubber plate is inserted between the connection portions. It was In such a structure, a flammable heat-shrinkable tube is not preferable in the case of an explosion-proof adaptive motor, and the insertion of an insulating member such as a rubber plate depends on the cable size and the number of cores, the thickness and size of the insulating member, the combination of insulating members, etc. It was complicated and time consuming.

The present invention has the following various advantages. (1) The plurality of metal connection parts can be insulated by the spherical insulator with good workability. (2) Since the insulator is spherical and the resin easily flows, there is almost no complicated and narrow portion, and air during the resin filling hardly remains. (3) Since the insulator is spherical, insertion work is easy, and cutting, processing, assembly, application of an adhesive, coating with a heat-shrinkable tube, and the like during the insulation work are completely unnecessary. (4) Since the insulator is spherical, a few types of cables can accommodate cables of all sizes and the number of cores. (5) Since the shape of the insulator is simple, it is highly available and economical. (6) Since a non-combustible metal part can be provided in the middle of the cable insulator in the resin, the explosion-proof performance is excellent.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a cable insertion port structure according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA between the connecting portions in FIG.

FIG. 3 is a perspective view when the spherical insulating member in FIG. 1 is inserted.

FIG. 4 is a vertical cross-sectional view showing a conventional example in which metal connection portions are insulated and sealed with an adhesive agent and a heat-shrinkable tube.

FIG. 5 is a vertical cross-sectional view showing another conventional example in which an insulating member such as a rubber plate is inserted between cores.

6 is a cross-sectional view taken along the line BB between the connection parts of FIG.

7 is a perspective view when the plate-shaped insulating member of FIG. 5 is inserted.

[Explanation of symbols]

 1 Cable 2 Housing 3a, 3b Core Wires 4a, 4b Cable Conductor Tip 5 Solder 6 Crimping Sleeve (Metal Connection) 7 Adhesive 8 Heat Shrink Tube 9 Rubber Packing 10 Washer 11 Ground 12 Band 13 Filling Resin 14 Plate Insulation Member 15 Spherical insulation member

Claims (1)

[Claims] 1. A spherical shape so that a plurality of core wires from the cable side are arranged in parallel and at equal intervals between the plurality of core wires from the underwater equipment side and the drained metal connection portion. A cable insertion structure for an underwater device, wherein an insulating material is inserted and fixed to the insertion opening by resin filling so as to include the spherical insulating material and the metal connection portion.