Filter Device Bypass Chamber Protective Filter
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Solution Overview
Problem
Existing filter devices for hydraulic systems in tanks, such as those used in excavators and wheel loaders, allow uncleaned fluid to bypass the filter medium and contaminate the tank when the bypass valve is open, particularly with heavily contaminated fluids like hydraulic oil, compromising system purity and operating behavior.
Innovation Solution
A filter device with a wall part on the fixing body that separates the housing into a filter element chamber and a bypass chamber, incorporating a protective filter through which fluid from the bypass valve must pass before leaving the filter element chamber, preventing contamination from reaching the tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bypass valve is opened to allow fluid to bypass the filter element, then fluid flow is improved and pressure drop is reduced, but contamination risk increases as unfiltered fluid can enter the tank
Solution Approach 1:
A protective filter is introduced as an intermediary component in the bypass chamber. This protective filter intercepts and filters contaminants from the bypassed fluid before it can enter the tank, thus mediating between the need for bypass flow and the requirement to prevent contamination. The protective filter acts as a mediator that allows fluid to pass through the bypass valve while still removing harmful particles.
Solution Approach 2:
The housing is segmented into a filter element chamber and a bypass chamber using a partition wall. This segmentation separates the filtration function from the bypass function, allowing independent optimization of each pathway. The bypass chamber is specifically designed to receive and filter bypassed fluid through the protective filter, while the filter element chamber handles primary filtration, thus resolving the contradiction by providing dedicated spaces for different flow paths with appropriate filtration levels.
2Object-affected harmful factors
If a protective filter is added to the bypass chamber, then contamination prevention is improved, but device complexity increases
Solution Approach 1:
The partition wall serving as the separator between the filter element chamber and bypass chamber is given multiple functions: it acts as the chamber divider, provides structural support for the bypass chamber, and serves as the mounting base for the protective filter. By making the partition wall multi-functional, the design avoids adding separate complex mounting structures, thus reducing overall device complexity while still achieving contamination prevention through the protective filter.
3Ease of operation
If the bypass valve is opened during filter element replacement, then ease of operation is improved, but system cleanliness deteriorates due to unfiltered fluid entering the tank
Solution Approach 1:
The protective filter is pre-installed in the bypass chamber and positioned on the partition wall before the filter element replacement operation begins. This preliminary preparation ensures that when the bypass valve is opened during filter element replacement, the protective filter is already in place to capture any contaminants in the bypassed fluid, thus maintaining system cleanliness without compromising the ease of filter element replacement.
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 design ensures high system purity by ensuring all fluid, even when the bypass valve is open, passes through a protective filter before entering the tank, significantly reducing the risk of contamination and enhancing the device's operating behavior.
Implementation Method 1
A protective filter is provided in the bypass chamber, through which the fluid flowing from the bypass valve can pass
Data Source
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AI summary
A filter device, having at least one filter element (17, 19) which can be received in preferably exchangeable fashion in a housing (9) and which has a filter medium (23) permeable to a flow of the fluid to be purified and which has, on at least one end, an end cap (25) which, for the purpose of positioning of the respective filter element (17, 19) in a functional position, interacts with a fixing body (33) which is connected to a removable cover (11) of the housing (9), and having a bypass valve (51) which is provided on the fixing body (33), is distinguished by the fact that, on the fixing body (33), there is provided a wall part (57) which, in the functional position, forms a dividing element in the housing (9), which dividing element separates the housing into a filter element chamber (65) and a bypass chamber (63) situated at the outflow side of the bypass valve (51), and that, in said bypass chamber, there is provided a protective filter (67) through which the fluid flowing out of the bypass valve (51) can flow.