Backflush Nozzle Slit Opening for Uniform Filter Cleaning
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Solution Overview
Problem
Existing filter systems with backwashing devices face inefficiencies in removing impurities from filter bodies due to non-uniform backwashing effects, leading to increased flow resistance and potential wear on components.
Innovation Solution
The backwash nozzle features a slit opening with a widening cross-sectional profile, accelerating the backflushing medium and providing a uniform impact area, along with a non-contact arrangement to reduce wear and enhance cleaning efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional backwashing device is used, then the filter body can be backwashed, but the backwashing effect is non-uniform leading to reduced cleaning efficiency
Solution Approach 1:
The backwashing device applies different local qualities to different regions of the filter body by using multiple nozzle groups (first, second, and third nozzle groups) positioned at different locations. Each nozzle group targets specific regions with optimized spray characteristics, ensuring uniform backwashing effect across the entire filter body surface rather than using a single uniform approach.
Solution Approach 2:
The backwashing device is segmented into multiple nozzle groups arranged in different spatial positions. This segmentation allows each group to independently target specific regions of the filter body, enabling precise control over the backwashing distribution and achieving uniform cleaning效果 across the entire filter surface.
2Productivity
If the backwash nozzle is in contact with the filter body, then the backwashing effect is enhanced, but wear on the nozzle increases
Solution Approach 1:
A distribution plate is introduced as an intermediary component between the backwash nozzle and the filter body. The distribution plate receives the backwash medium from the nozzle and distributes it uniformly across the filter body surface, allowing the nozzle to remain retracted and non-contacting while still achieving effective backwashing through the mediating distribution plate.
Solution Approach 2:
The direct mechanical contact system between the backwash nozzle and filter body is replaced with a fluid-based distribution system. The backwash medium serves as the transmission carrier, delivering the cleaning action without requiring physical contact between the nozzle and filter body, thereby eliminating mechanical wear.
3Reliability
If the filter body is backwashed frequently, then flow resistance is reduced, but energy consumption increases
Solution Approach 1:
The backwashing operation is designed to be continuous and uniform across the entire filter body surface through the coordinated operation of multiple nozzle groups. This continuous uniform action prevents localized clogging and ensures consistent flow resistance reduction, optimizing the timing and efficiency of backwashing to minimize energy consumption while maintaining reliable flow characteristics.
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 results in an improved backwashing effect, reducing wear and maintaining high performance by ensuring uniform loading and accelerated cleaning across the filter body, while minimizing friction and wear on components.
Implementation Method 1
the cross-sectional profile having a nozzle section which widens in the direction of flow. Due to the slit shape of the opening, the impact area for the backflushing medium on the clean side of the filter body is rectangular. The nozzle profile of the slot opening, which is characterized by the nozzle section widening in the direction of flow, is also particularly advantageous. Due to the nozzle profile, the gaseous backflushing medium can be accelerated in the direction of flow in the slot opening
Implementation Method 2
Backwashing then takes place in the opposite direction to the filtering direction, i.e. from the clean side to the dirty side. In this way, the impurities deposited on the filter body on the raw side can be removed
Implementation Method 3
the backflushing medium receives a relatively high impulse that can be used to increase the backflushing effect on the filter body
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a backflush device (6) for a filter system (1) for removing impurities from a fluid, the backflush device (6) serving to backflush a filter body (3) in the filter system separating the clean side (5) from the inlet side (4), and comprising at least one backflush nozzle (7) for applying a rinse medium to the filter body (3), said nozzle comprising at least one opening (8) through which the rinse medium flows in a flow direction (9) during backflushing and exits the backflush nozzle (7). In order to improve the effectiveness of the backflushing, the at least one opening is designed as a slit opening (8) extending transverse to the flow direction (9) in a straight line having a constant cross-sectional profile (16) comprising a nozzle segment (17) expanding the flow direction (9).