Rotating Fluid Jet Seal with Angled End Face
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Solution Overview
Problem
High pressure water jetting systems experience premature seal failure due to high temperature issues caused by large force distribution across sealing surfaces at the nozzle-housing interface, leading to reduced seal life.
Innovation Solution
The seal is designed without an outer peripheral seal point, utilizing an angled end face that contacts a mating angle on a back-up ring to create a smaller force area, with an inner seal point between the seal and the nozzle shaft, reducing heat generation and extending seal life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing surfaces are provided at both radially outer and radially inner surfaces, then sealing effectiveness is improved, but temperature on the seal increases and seal life decreases
Solution Approach 1:
The invention removes the outer peripheral seal point from the seal design, extracting only the necessary sealing function to the end surface and radially inner peripheral surface. This reduction in sealing surface area directly decreases the force distribution area, thereby reducing heat generation and temperature on the seal while maintaining adequate sealing effectiveness.
Solution Approach 2:
The invention concentrates the sealing function to specific localized areas - the end surface and radially inner peripheral surface - rather than distributing it across the entire outer peripheral surface. This localized sealing approach reduces the overall area subject to high temperature and force, extending seal life while maintaining sealing performance where it is most needed.
2Reliability
If sealing surfaces are provided at both radially outer and radially inner surfaces, then sealing effectiveness is improved, but seal life decreases
Solution Approach 1:
The invention removes the outer peripheral seal point from the seal design, extracting only the necessary sealing function to the end surface and radially inner peripheral surface. This reduction in sealing surface area directly decreases the force distribution area, thereby reducing heat generation and temperature on the seal while maintaining adequate sealing effectiveness.
Solution Approach 2:
The invention concentrates the sealing function to specific localized areas - the end surface and radially inner peripheral surface - rather than distributing it across the entire outer peripheral surface. This localized sealing approach reduces the overall area subject to high temperature and force, extending seal life while maintaining sealing performance where it is most needed.
3Area of stationary object
If force is distributed over a large area, then sealing coverage is improved, but heat generation increases
Solution Approach 1:
The invention removes the outer peripheral seal point from the seal design, extracting only the necessary sealing function to the end surface and radially inner peripheral surface. This reduction in sealing surface area directly decreases the force distribution area, thereby reducing heat generation and temperature on the seal while maintaining adequate sealing effectiveness.
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
This configuration significantly increases the seal's lifespan by minimizing the force and heat on the seal, resulting in a longer-lasting seal compared to prior art solutions.
Implementation Method 1
The radial inner surface was typically on the shaft and the radially outer surface was within the housing. These two sealing points at those locations creates a force on the seal over a relatively large area. This relatively large area causes high temperature levels on the seal
Data Source
AI summary
An improved seal for use in fluid systems such as a water jet system includes an outer seal point that is very close to an inner seal point. By spacing these two seal points very close together, the force on the seal is greatly reduced compared to the prior art. In the disclosed embodiment, the outer seal point is on an angled forward face of the seal that abuts a back-up ring angled face. The inner seal point is between the seal and an internal shaft which rotates relative to a housing.