Spin-On Filter Outlet Tube Isolation for Clean-Side Contamination Control
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Solution Overview
Problem
Existing spin-on filters allow impurities from threaded surfaces to contaminate the clean side during installation, leading to potential contamination of engines or machines with plastic or metal particles.
Innovation Solution
A spin-on fluid treatment device with an outlet tube partially disposed inside the threaded bore, featuring an externally oriented sealing portion that engages with a complementary element, isolating the inner thread from the clean side and preventing contamination by forming a seal without relying on separate sealing members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the threaded bore is used for installation, then the filter can be mounted on the engine, but impurities from the threaded surfaces contaminate the clean side
Solution Approach 1:
The patent divides the fluid path into separate zones: the threaded bore remains isolated from the clean side, while the outlet tube provides a dedicated contamination-free path. The sealing portion creates a barrier that segments the contaminated thread zone from the clean fluid zone, preventing impurity migration while maintaining installation functionality.
Solution Approach 2:
The outlet tube acts as an intermediary element between the threaded bore and the clean side. It provides a protective barrier that allows the threaded connection to function while preventing direct contact between potential impurities and the clean fluid path, thus mediating between the mounting requirement and contamination prevention.
2Reliability
If the outlet tube is disposed inside the threaded bore, then the inner thread is isolated from the clean side, but the sealing complexity increases
Solution Approach 1:
The patent combines the sealing function with the outlet tube structure itself. The sealing portion is integrated into the outlet tube design, merging the sealing function with the existing structural element rather than adding a separate sealing component. This reduces overall complexity while achieving effective isolation.
Solution Approach 2:
The outlet tube with its sealing portion performs multiple functions simultaneously: it provides the fluid outlet path, creates the seal against the bore wall, and maintains the isolation barrier. The structure serves itself by incorporating the sealing capability directly into its geometry, eliminating the need for additional sealing components.
Data Source
AI summary
The disclosure pertains to a spin-on fluid treatment device, including a treatment medium disposed within a housing, a top surface having an internally threaded bore and an outlet tube at least partially disposed inside said threaded bore in a concentric position. The outlet tube can have an externally oriented sealing portion for engaging with a complementary element of an inlet spud of an entity that receives said treated fluids. The outlet tube can be configured as an alignment feature to guide the treatment device onto the inlet spud during installation. The outlet tube can be configured with both an externally oriented sealing portion and an alignment feature. The disclosure also pertains to a system comprising a machine having a treatment device head and a spin-on fluid treatment device, a kit, a spin-on fluid filter cartridge, and a method of mounting a spin-on filter cartridge onto a filter head.