Submersible Motor Cable Feed-Through Sealing System
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Solution Overview
Problem
Submersible motors face issues with sealing effectiveness due to impurities and dirt entering through cable feed-throughs, leading to a loss of watertight integrity over time, which compromises the motor's functionality.
Innovation Solution
A submersible motor design featuring a housing with a watertight cable feed-through system that includes a detachable sealing collar with a first seal and a means to apply permanent radial force, ensuring a consistent seal even after long periods, using a soft and elastic material for the seal and a compression spring element to maintain force application, and additional seals for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a cable feed-through with seal is used in submersible motors, then electrical power can be supplied to the motor, but impurities and dirt can enter through the cable feed-through, causing sealing failure over time
Solution Approach 1:
The cable feed-through system is divided into separate functional components: a detachable sealing collar that can be removed independently from the motor housing, allowing the seal to be replaced without replacing the entire feed-through assembly. This segmentation enables maintenance of sealing effectiveness while maintaining electrical power supply capability.
Solution Approach 2:
The sealing collar is pre-assembled with the seal in a controlled manufacturing environment, ensuring proper seal installation before the cable feed-through is integrated into the motor. This preliminary assembly prevents seal damage during installation and ensures optimal sealing performance from the start.
2Ease of repair
If the cable is detached from the submersible motor housing, then the cable can be replaced or serviced, but impurities can get into the seal, resulting in limited or complete loss of sealing action
Solution Approach 1:
The sealing collar is designed as a detachable component that can be removed from the motor housing without removing the cable from the seal. This allows the sealing collar to be serviced or replaced independently, maintaining seal integrity while enabling easy repair of the cable system.
Solution Approach 2:
The sealing collar acts as an intermediary component between the cable seal and the motor housing. It provides a removable interface that allows cable access while protecting the seal from contamination, enabling cable replacement without exposing the seal to impurities.
3Duration of action of stationary object
If a permanent force is applied to the seal radially in the feed-through, then the seal remains tightly sealed against the cable even after long periods and material degradation, but the device complexity increases
Solution Approach 1:
The sealing collar is designed with inherent geometric features that create radial compression force on the seal through its structural configuration. This passive mechanical design maintains constant sealing pressure without requiring additional active force application mechanisms, preserving seal durability while minimizing device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a reliable, long-lasting watertight seal that reduces maintenance needs and prevents contamination, ensuring the submersible motor operates effectively and efficiently.
Implementation Method 1
a means for applying force to the first seal, which is designed for permanently applying force to the first seal radially in the feed-through... and a compression spring element to maintain force application
Implementation Method 2
using a soft and elastic material for the seal... The first seal is here fabricated out of a soft and elastic material
Data Source
AI summary
An immersion motor includes a housing (3) having a wall (4) with a watertight cable penetration (5, 6; 5, 6′). The cable penetration includes an inlet (5) in the wall (4) for a cable (25) and a sealing collar (6; 6′) that can be released from the inlet (5) having a penetration (20) for the cable (25). The sealing collar (6; 6′) includes a first seal (45; 45′) disposed on the penetration (20) and means for applying force (75, 85, 90) to the first seal (45; 45′), which is designed for permanently applying force to the first seal (45; 45′) radially in the penetration (20). The cable penetration (5, 6; 5, 6′) further includes means for releasably attaching (35, 40) the sealing collar (6; 6′) to the inlet (5). At least one second seal (120, 125) is provided between the sealing collar (6; 6′) and the inlet (5).