Spin-On Filter Outlet Tube Sealing Against Clean-Side Contamination
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Solution Overview
Problem
Existing spin-on filters are prone to contamination as impurities from the threaded surfaces can migrate to the clean side of the filter during installation, potentially reaching the machine or engine during operation.
Innovation Solution
A spin-on fluid treatment device with a housing featuring an internally threaded bore, radially positioned inlet orifices, and an axial seal, where an outlet tube is concentrically positioned within the threaded bore and equipped with an externally oriented sealing portion to prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal threaded surfaces are used for filter installation, then the filter can be securely mounted to the engine, but impurities from the threaded surfaces can contaminate the clean side of the filter
Solution Approach 1:
The filter assembly is divided into separate functional zones: a dirty side for thread engagement and mounting, and a clean side for filtered fluid passage. The outlet tube and seal create a physical barrier that segments the clean fluid path from the contaminated threaded interface, allowing secure mounting while preventing contamination.
Solution Approach 2:
The outlet tube acts as an intermediary element between the threaded bore and the clean fluid passage. It provides a sealed transition zone that mediates the connection between the potentially contaminated external threading and the clean internal fluid path, preventing direct contact between impurities and the filtered fluid.
2Object-affected harmful factors
If additional sealing members are added to prevent contamination, then contamination is reduced, but device complexity increases
Solution Approach 1:
The sealing function is merged with the outlet tube structure itself. The outlet tube is designed with an integrated seal that combines the fluid passage function with the sealing function, eliminating the need for separate sealing members while maintaining contamination prevention.
Solution Approach 2:
The outlet tube serves multiple functions simultaneously: it provides the fluid outlet passage, creates the seal between the threaded bore and clean side, and acts as a barrier against contamination. This multi-functionality reduces the number of separate components needed while maintaining effective contamination prevention.
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.