JPH0640430Y2 - Water-sealed underwater motor outlet connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial field The present invention relates to a high temperature and high water pressure underwater cable used to send electric power to a pump motor used in high water pressure such as high temperature or deep well pumps for hot springs. And a motor coil connection structure.

2. Description of the Related Art In recent years, pump motors have been used under high temperature and high water pressure.

Conventionally, a cable of the same diameter is connected by a heat-shrinkable tube coated with a heat-resistant adhesive, such as "connection structure of power cable for high temperature underwater" described in JP-A-63-190512, for taping. Cables of different diameters and motor coils are connected by overlapping and winding.

In both cases, the airtightness of the connection portion is ensured by the shrinkage force of the tube, the shrinkage force of the tape, and the "pressure bonding" of the adhesive applied inside.

However, with the above-mentioned configuration, the waterproof protection of different diameters such as the sheath of the underwater power cable (hereinafter referred to as a cable) and the diameter of the motor coil insulator layer, which are greatly different in diameter, is provided. It is not possible with the current shrinkage rate of the shrink tube, and it is also not possible to protect one underwater cable conductor and several motor coils (hereinafter referred to as coils) from waterproofing. On the other hand, the overlapping multiple wrapping of the tape is currently used as a waterproof protection for the connection part of the coil, but it depends on the manual work of a skilled worker, and the multiple overlapping wrapping of the tape is required to eliminate the diameter step, and the work time is increased. Has a problem that it becomes a bottleneck in the process for a long time.

Also, in the case of submersible pump motors with a small number of units produced and with many combinations of cables and coils at the connection parts, the cable-side sheath part and the coil-side wire film part including the heat-resistant insulation connection part are integrally molded or adjusted to the diameter. Making a rubber tube was economically problematic.

In view of the above problems, the present invention has a good bendability for a combination of dozens of motor coils and different diameters generated for one cable, without the need for skilled manual work such as the taping connection method. Provided is a water-sealed submersible motor outlet connection structure for high temperature and high water pressure, which is compactly housed in a coil end and does not cause water leakage from a connecting portion and deterioration of insulation even when used for a long period of time.

Means for Solving the Problems In order to solve the above problems, the water-sealed submersible motor outlet connection structure of the present invention is a water-sealed underwater motor waterproof insulation coil (hereinafter abbreviated as “coil”) and underwater power. At the connection portion of the cable (hereinafter abbreviated as “cable”), the first water-resistant insulating elastic body (hereinafter “coil-side rubber tube”) attached to the coil
And a second water-resistant insulating elastic body (hereinafter referred to as "cable side rubber tube") mounted on the cable side and also on the coil side rubber tube, and the outer peripheral portion of the cable side rubber tube. Is compressed and the respective mounting parts are brought into close contact with each other.

The present invention has the above-described structure, and by the restoring force of the rubber tube compressed and fixed with a constant force, the sheath portion and the wire coating near both ends of the heat resistant insulation connection portion and the coil side rubber tube outer diameter water resistant layer and the cable side The water resistant layer of the rubber tube is spiral (spiral), and the water resistant protective seal portion is formed in multiple layers according to the number of windings of the bind wire, so that highly reliable heat resistant water resistant insulation protection is formed.

In addition, by adopting a double rubber tube system in which the coil side rubber tube is separated from the cable side rubber tube, the lead-out dimension on the coil end side is shortened, and in order to improve the coil winding workability, a thick coil is used for a coil with a thin wire diameter. Even with the parallel winding method (having two wires), the coil holes on the coil side rubber tube are
It can be handled with a simple change such as changing the number.

Embodiment Hereinafter, a connection structure of a water-sealed pump motor coil according to an embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 (a), (b) and (c) show the connection structure of the water-sealed pump motor coil in an embodiment of the present invention in which the number of motor coils is two.

1 is a cable, 1-1 is a heat and water resistant insulation sheath, 1-
Reference numeral 2 is a heat resistant insulation coating, 1-3 is a core wire conductor, 2 is a coil, 2-1 is a water resistant and heat resistant insulated wire electric wire coating, 2-2 is a core wire conductor,
3 is a crimp terminal for electrically and mechanically connecting core conductors,
4 is a heat-resistant insulating tape, 5 is a heat- and water-resistant insulating cable-side rubber tube (hereinafter referred to as a cable-side rubber tube), 6 is a heat-resistant and water-resistant insulating coil-side rubber tube (hereinafter referred to as a coil-side rubber tube),
7 is a heat and corrosion resistant bind wire, and 8 is a heat resistant shrinkable tube.

The connection structure of the water-sealed underwater motor outlet wire configured as described above will be described.

As shown in FIG. 2, the core wire 2-2 of the coil and the core conductor 1-3 peeled in a stepwise manner are electrically and mechanically connected by the crimp terminal 3, and as shown in FIG. The coil-side electric wire coating 2-1 and the cable-side insulating coating portion 1-2 and the charging portion of the crimp terminal 3 are insulated from each other by the tape 4 having the adhesive applied inside to form a heat-resistant insulating connection portion. Then cable 1
The cable-side rubber tube 5 previously inserted through is moved to the taping connection portion side, and is inserted so as to cover the coil-side rubber tube 6 previously inserted near the core wire conductor connection portion. The outer circumferences of the coil side rubber tube 6 and the cable side rubber tube 5 into which the cable 1 is inserted are respectively wound around the bind wires 7 with an appropriate force, the ends are twisted and fixed, and the outer circumferences of the bind wires 7 are heat-shrinkable tubes 8 It is covered with and fixed by compression.

As described above, according to the present embodiment, it is possible to secure the flexibility of the core conductor connecting portion and ensure the water resistance protection. Also, for cable-side rubber tubes that match the size of one type of cable sheath, by changing the number and diameter of holes in the coil-side rubber tube, different voltage windings, two-end windings, and other types of motor coils can be supported. can do.

Although the surface of the cable-side rubber tube is linear in the above-described embodiment, a spiral groove or a groove is formed on the surface (outer periphery) of the cable-side rubber tube as shown in FIGS. By providing a plurality of grooves in a bellows shape and improving the flexibility thereof, the connecting portion can be compactly housed in the coil end portion of the motor.

Effects of the Invention As described above, according to the present invention, the heat-resistant insulation core wire connection portion has the cable-side rubber tube whose inner diameter matches the sheath diameter on the cable side, and the outer diameter with the hole diameter matching the wire coating diameter on the coil side. By inserting a separate double rubber tube into the coil side rubber tube that can be inserted into the cable side rubber tube, water resistance protection of the core wire connection part is ensured, multiple wires with different diameters can be connected, and bending is possible. It has good performance and can be compactly stored in the coil end.

[Brief description of drawings]

FIG. 1 (a) is a sectional view of a connection structure of a water-sealed pump / motor coil according to an embodiment of the present invention, FIG. 1 (b) is a sectional view of a cable, and FIG. 1 (c) is a sectional view of a coil. FIG. 2 is a sectional view of a connecting portion of a core conductor, and FIG. 3 is an external view of a cable-side rubber tube of another embodiment. 1 ... Cable, 2 ... Coil, 3 ... Crimp terminal, 4 ...
… Tape, 5 …… Cable side rubber tube, 6 …… Coil side rubber tube, 7 …… Bind wire, 8 …… Shrink tube.

Claims (2)

[Scope of utility model registration request] 1. A first water-resistant insulation mounted on a coil at a connection portion between a water-resistant insulation coil (hereinafter referred to as "coil") of a water-sealed submersible motor and an underwater power cable (hereinafter referred to as "cable"). An elastic body (hereinafter referred to as "coil side rubber tube") and a second water resistant insulating elastic body (hereinafter referred to as "cable side rubber tube") mounted on the cable side and also on the coil side rubber tube A water-sealed underwater motor outlet connection structure in which the outer circumference of the cable-side rubber tube is compressed and the respective attachment parts are in close contact. 2. The water-sealed submersible motor outlet connection structure according to claim 1, wherein a concentric or spiral groove or protrusion is provided on the outer peripheral portion of the cable-side rubber tube so as to have flexibility.