Connection socket for submersible electrical motors

Abstract: This invention concerns a connection socket for a sub­ mersible electric motor. The connection box of the motor is provided with two plates (3) and (5) resp one of which (3) holding the connection pins (1). The other plate (5) is arranged to devide the connec­ tion box into two sealed rooms to prevent liquid coming into the box along the electric cable from going further into the motor.

Description: This invention concerns a connection socket for the electric connection to a submersible electric motor or generator. Connection sockets for this purpose are, especially at big machines, made of an isolated plate provided with a number of pins for the electric conductors which are casted within the plate. At one side of the plate, the underside, the connectors from the electric motor are attached. On the other side of the plate the conductors from a motor cable are connected. The pins are waterproof arranged in the isolated plate and the latter is in its turn waterproof mounted in the wall of the connection box. In this way two independent waterproof isolated rooms are obtained which means that incoming liquid in the upper room is prevented from going into the lower room and into the motor. US-A-3602 742 shows an example of a connection socket provided with sealingly devided rooms and US-A-2897 763 shows a connector means especially suitable for submersible pump motors. When mounting the plate the conductors at the underside are first connected to the pins and then the plate is mounted. This means that the conductors at the underside must be relatively long to make the mounting possible. When the plate thereafter is mounted the conductors are packed under the plate and may be squeezed or bent in a non-suitable way thus damaging the isolation. In the prior art mentioned above, this is very likely to happen. The problem is solved according the invention by help of the device stated in the claims. The invention is more closely described below with reference to the drawings. Fig 1 shows a device according to the invention seen from above, while fig 2 shows a vertical section of a part of the device. In the drawings 1 stands for a connection pin having a hole 2 for a conductor. 3 stands for a lower plate having isolated holders for the pin 1. 5 stands for an upper plate, 6 another isolated holder and 7 and 8 o-rings. According to the invention the mentioned isolated plate is replaced by two plates 3 and 5. The lower plate 3 is put on its place and the pins 1 are mounted on the plate by help of a holder 4. The plate 3 and the holder 4 now serve to stabilize the pins during the mounting. The conductors from the electric motor which are brought up through the plate 3 are connected to the pins 1 in the holes 2. Superfluous ends are cut and the conductors are so arranged that there are no risks for squeezings or bendings. Then the upper plate 5 is brought downwards over the pins the holes in the plate being somewhat wider than the pins to facilitate the mounting. A supporting and sealing socket 6 of isolated material is brought downwards over each pin and is connected to the plate 5 by screws. In order to secure a perfect sealing o-rings 7 and 8 respectively are arranged between the pin 1 and the socket 6 between the latter and the plate 5. As the socket 6 is made of isolated material the plate 5 may be manufactured in some other material such as cast-iron. The plate 5 is then sealingly attached to the connection box and an entirely waterproof deviding of the housing has now been obtained. The connection of incoming conductors to the upper parts of the pins 1 is made in the usual way. The big advantage with the device according to the invention is thus that all connection and mounting may be made under full control and there are no risks for squeezing or bending of the conductors.

Claims: A connection socket for a submersible electric motor or generator for connection of incoming conductors where the connection box for incoming electric conductors is sealingly divided by a partition wall with connection pins (1), characterized in, that the connection socket comprises two plates (3) and (5), the connection pins (1) being arranged on the upper side of the lower plate (3) heading the electric motor, that the pins are provided with connection means (2) for the conductors from the electric motor above the plate 3, that the upper plate (5) is mountable around the upper ends of the pins, which upper plate is sealed against the pins and the connection box for sealing the latter in waterproof divided rooms and that the upper ends of the pins above the plate (5) are provided with connection means for incoming cable conductors. Connection socket according to claim 1, characterized in, that holders (6) are arranged in the lead through between the pins (1) and the plate (5), o-rings (7) and (8) resp being provided for sealing between the pins and the holder and the holder and the plate resp.

Inventors: STAHL TORVALD, STAHL, TORVALD
Applicants: FLYGT AB ITT, ITT FLYGT AKTIEBOLAG
Application year: 1986
Main classification: H02K5
IPC codes: H01R13, H02K5