Filter Device With Offset Longitudinal Slots For Pulsation Damping
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Solution Overview
Problem
Existing filter devices for lubricating oil filtration, particularly in diesel engines, face challenges in maintaining optimal operating conditions during backwashing, leading to inefficient contaminant separation and increased maintenance costs due to pulsating force attacks and limited flow channel utilization.
Innovation Solution
The filter device incorporates a pair of flushing nozzles with longitudinal slots arranged in axial alignment but offset transversely, ensuring continuous backwashing with pulsation damping, and a guide device for secure mounting, allowing for efficient fluid flow and contaminant separation through oblique flow patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single flushing nozzle is used for backwashing, then the device complexity is reduced, but the backwash flow becomes pulsating causing harmful forces on the nozzle
Solution Approach 1:
The patent combines two flushing nozzles into a single integrated assembly mounted on the drive shaft. The nozzles are positioned at different angular locations (e.g., 180 degrees apart) and both discharge through the same hollow drive shaft, merging their functions into a single unit that rotates together, thereby eliminating pulsating forces while maintaining a relatively simple device structure.
Solution Approach 2:
By positioning multiple flushing nozzles at different angular locations on the rotating drive shaft, the system ensures that at least one nozzle is continuously discharging backwash flow onto the filter element at any given time. This creates a continuous backwashing action rather than intermittent pulsating flow, eliminating harmful force variations while maintaining effective cleaning.
2Reliability
If flushing nozzles are positioned to cover all fluid passage points simultaneously, then cleaning effectiveness is improved, but the flow channels cannot be opened sequentially to optimize flow distribution
Solution Approach 1:
The flushing nozzles are arranged to sequentially engage with different fluid passage points during rotation. Each nozzle periodically covers specific passage points as the drive shaft rotates, creating a periodic cleaning pattern that systematically addresses all areas of the filter element over complete rotation cycles, ensuring thorough cleaning while optimizing flow distribution.
Solution Approach 2:
Different flushing nozzles are positioned to target specific local areas of the filter element corresponding to different fluid passage points. Each nozzle is optimized for its specific engagement zone, providing localized cleaning effectiveness while the rotation ensures comprehensive coverage of the entire filter element surface over time.
3Productivity
If the longitudinal slots of flushing nozzles are aligned with fluid passage points, then backwash flow is enabled, but wall parts defining fluid passage points cannot be cleaned simultaneously
Solution Approach 1:
The system uses rotational dynamics to resolve the static alignment conflict. The flushing nozzles are mounted on a rotating drive shaft, allowing their longitudinal slots to dynamically align with different fluid passage points and adjacent wall parts at different moments during rotation. This dynamic positioning enables both flow availability and comprehensive cleaning coverage over the rotation cycle.
Solution Approach 2:
The flushing nozzles are positioned and oriented during installation to pre-establish the correct angular relationships with fluid passage points and wall parts. The longitudinal slots are preliminarily aligned to engage with specific features of the filter element at predetermined positions, ensuring optimal cleaning coverage and flow distribution when the system operates.
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 achieves continuous backwashing with reduced pulsation, enhancing contaminant separation and extending filter insert life, thereby lowering maintenance costs and improving operational safety.
Implementation Method 1
the backwash flows merge into one another through the overlap of the backwash nozzles, resulting in a continuous backwash flow
Implementation Method 2
Thanks to this pulsation-damped backwash, the pulsating force exerted on the respective backwash nozzle by repeated flow interruptions is also avoided
Implementation Method 3
The energy storage device can advantageously be formed from an elastically acting sealing ring, which is supported on one side by the drive shaft and on the other side by the respective flushing nozzle
Data Source
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AI summary
The invention relates to a filter device, in particular for filtering lubrication, consisting of at least one filter insert (19), in which a respective filter material (27) is received and which is provided with fluid passage points (70) that are delimited by wall parts (63) of the filter insert (19) and with a backflush device (37, 49) that has at least one flush nozzle (49), said flush nozzle being movable along the interior of the respective pairable filter insert (19) by means of a hollow drive shaft (37). The invention is characterized in that at least one pair of flush nozzles (49) is provided for each filter insert (19, 21), said flush nozzles having longitudinal slots (73, 74) which are arranged one over the other in the axial direction of the drive shaft (37), wherein the longitudinal slots have an offset relative to one another which runs transversely to the axial direction such that for adjacent flush nozzles (49), at least one part of the longitudinal slot (73) of one flush nozzle (49) overlaps with at least one of the fluid passage points (70) of the pairable filter insert (19, 21) and at least one part of the longitudinal slot (74) of the other flush nozzle (49) at least partly overlaps with the wall parts (63) which delimit the aforementioned fluid passage point of the filter insert (19, 21).