Filter Device Back Pressure Valve Drainage Design
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Solution Overview
Problem
Existing filter devices allow liquid to drip outside when replacing the filter element, leading to potential hydraulic oil leakage and maintenance issues.
Innovation Solution
A filter device design that includes a filter case with a back pressure valve and an outflow portion, allowing liquid to drain without removing the lid body, and featuring an air vent hole to prevent air bubbles and erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flow path of liquid is completely blocked when the internal combustion engine is stopped, then the liquid can be retained in the filter case, but the liquid trapped in the filter case drips to the outside when the filter element is replaced
Solution Approach 1:
The invention extracts the drainage function from the complete blockage system by providing a separate drainage path through the lid body that is independent of the main flow path blockage. This allows liquid to be drained through a dedicated drainage hole while the check valve maintains blockage of the main flow path, preventing dripping during filter element replacement.
Solution Approach 2:
The lid body serves as an intermediary component that mediates between the liquid retention requirement and the drainage requirement. It provides both the check valve for blocking the main flow path and the drainage hole for liquid removal, acting as a bridge between these two conflicting functions.
2Loss of substance
If the lid body is removed to drain liquid from the filter case, then liquid can be drained, but the operation becomes more complex and time-consuming
Solution Approach 1:
The invention prepares the drainage path in advance by providing a pre-formed drainage hole in the lid body that is ready for use. The check valve is also pre-positioned to automatically control the drainage process, eliminating the need for complex manual operations or removal of the lid body during drainage.
Solution Approach 2:
The check valve provides self-service by automatically controlling the drainage process based on pressure differential. When the engine stops and pressure equalizes, the check valve automatically opens to allow drainage through the drainage hole, and automatically closes when pressure differential is restored, without requiring manual intervention or lid body removal.
3Productivity
If air is trapped in the filter case, then the filtration process can continue, but air bubbles may cause erosion and damage to the system
Solution Approach 1:
The invention extracts the air venting function from the filtration path by providing a separate air vent hole in the lid body. This allows air to be removed through a dedicated path while the filtration process continues uninterrupted through the filter element, preventing air bubble erosion without affecting productivity.
Solution Approach 2:
The lid body serves multiple functions: it houses the check valve for liquid retention, provides the drainage hole for liquid removal, and includes the air vent hole for air evacuation. This multi-functionality allows the system to handle liquid retention, drainage, and air venting through a single component without compromising filtration continuity.
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
Prevents hydraulic oil from dripping outside during filter element replacement, ensures efficient drainage, and prevents air bubbles from forming in the stored liquid, thus reducing the risk of erosion and maintaining system stability.
Implementation Method 1
a first elastic member provided between the bottom surface and the valve body
Implementation Method 2
a back pressure valve provided at the outflow portion... the valve body is movable between a closed position in which the valve body is in contact with the upper surface and covers the first hole
Data Source
AI summary
An outflow portion that causes a space inside a filter element to communicate with a space outside a filter case includes an upper surface and a bottom surface that are provided so as to be separated from each other. The back pressure valve includes the valve body having the substantially plate-like shape and the elastic member provided between the bottom surface and the valve body. The valve body is movable between a closed position in which the valve body is in contact with the upper surface, and an open position in which the valve body is not in contact with the upper surface. A recessed portion is provided in a surface, of the valve body, that comes into contact with the upper surface, and an outflow port is formed in a side surface or the upper surface of the outflow portion.