Liquid Filter Assembly with Directionally Biased Valve for Cavitation Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid filters in hydraulic systems face challenges in preventing cavitation and damage to downstream components due to conditions like cold starts and flow surges, particularly when occluded elements occur, leading to inefficiencies and equipment damage.
Innovation Solution
The liquid filter assemblies incorporate a non-helical spring, directionally biased valve arrangement and a flow/pressure regulation valve to manage liquid flow, ensuring it readily permits flow into the housing while resisting flow out, thereby protecting downstream components and maintaining fluid levels in the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid filter is used in a hydraulic system, then liquid filtration is achieved, but cavitation and damage to downstream components occur under conditions like cold starts and flow surges
Solution Approach 1:
The directionally biased valve arrangement is pre-configured to automatically open and permit liquid flow from the tank reservoir into the housing interior when downstream pressure drops (such as during cold starts or flow surges), preventing cavitation before it occurs by establishing positive pressure in advance
Solution Approach 2:
The non-helical spring acts as an intermediary mechanism between the valve arrangement and the filter housing, providing the necessary biasing force to keep the valve closed during normal operation while allowing it to open automatically when pressure differential exceeds the spring force, thus mediating between flow control and cavitation prevention
2Reliability
If the valve arrangement permits free liquid flow into the housing, then cavitation is prevented, but liquid flow control and pressure regulation become difficult
Solution Approach 1:
The directionally biased valve arrangement is designed to automatically respond to pressure differentials without external control, opening when downstream pressure drops and closing when normal pressure is restored, providing self-regulating flow control that prevents cavitation while maintaining system pressure balance without requiring complex control systems
Solution Approach 2:
The non-helical spring provides a variable biasing force that changes with compression, creating a pressure threshold that automatically adjusts the valve opening based on system conditions, allowing the system to maintain reliability across varying operating parameters without complex control logic
3Manufacturing precision
If occluded filter elements occur, then filtration efficiency is maintained, but flow restriction increases causing cavitation risk
Solution Approach 1:
The directionally biased valve arrangement provides a pre-configured bypass path that activates automatically when filter elements become occluded and downstream pressure drops, allowing liquid to bypass the restricted filter media while maintaining flow rate and preventing cavitation before it can occur
Solution Approach 2:
The valve arrangement transitions dynamically between closed and open states based on real-time pressure differential conditions, automatically adjusting flow path resistance to match system needs - closed during normal operation for efficient filtration, open when occlusion occurs to maintain flow and prevent cavitation
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 effectively prevents cavitation and ensures consistent fluid flow, protecting downstream equipment by allowing liquid to enter the housing while inhibiting reverse flow, thus maintaining system efficiency and preventing damage.
Implementation Method 1
The first, non-helical spring, directionally biased valve arrangement is positioned in operative association with the suction filter media. The first, non-helical spring, directionally biased valve arrangement is generally positioned and configured to readily permit liquid flow from a tank reservoir into the housing interior. The first, non-helical spring, directionally biased valve arrangement is also configured to resist liquid flow from the housing interior through the first, non-helical spring, directionally biased valve arrangement.
Data Source
AI summary
A liquid filter assembly is provided. The assembly includes a liquid filter cartridge and a housing. The liquid filter cartridge, includes, among other things, first and second, opposite, end caps each having a central aperture therethrough. A seal arrangement including a radially directed seal is mounted on a seal support of the first end cap that projects away from the second end cap. The cartridge includes a seal mount configured to define a seal plane non-orthogonal to a central axis of the cartridge. The housing includes a filter head and a housing sidewall. The filter head includes a filter head having a body, a top cover and a bottom aperture opposite the top cover. The housing extends through the bottom aperture. The cartridge as described is installed in the housing, with an end cap radially sealed against a tube in a bottom of the housing.