Belt Filter with Fixed Arc Guides and Honeycomb Support

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Solution Overview

Problem

Band filters with rotatable discs or rings face issues with uneven liquid distribution and high friction, leading to inefficient filtration and potential filter cake loss, while fixed guides cause friction and sealing problems.

Innovation Solution

A band filter with fixed, arc-shaped guides and a honeycomb support belt that hooks onto the filter belt, maintaining constant friction and sealing, eliminating the need for rotatable components and preventing filter belt slippage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If rotatable discs or rings are used to guide the filter belt, then the filter belt can be continuously conveyed, but the friction is high and causes uneven liquid distribution and potential filter cake loss

Engineering Contradiction:

Improvecontinuous conveyance of filter beltVSAvoidfriction between filter belt and guides

Core Design Contradiction:

ProductivityVSForce

Solution Approach 1:

The patent removes the rotatable discs or rings from the system and replaces them with fixed arc-shaped guides. This extraction of the rotary components eliminates the high friction and uneven liquid distribution problems while maintaining continuous belt conveyance through the fixed guides.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of using rotating guides that move with the belt, the patent inverts the approach by using fixed guides that remain stationary while the belt moves over them. This inversion resolves the friction and liquid distribution issues associated with rotating guides.

Inventive Principle:

Principle #13The other way round (Inversion)

2Object-affected harmful factors

If fixed guides with arcuate course are used, then the gradient on discharge side is reduced to prevent filter cake loss, but the friction causes the filter belt to narrow and slip off the guides

Engineering Contradiction:

Improvefilter cake falling into filter troughVSAvoidfilter belt stability on guides

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent applies different geometric properties to different parts of the fixed guides. The guides have an arcuate course with specific radius variations - a larger radius on the discharge side to reduce gradient and prevent filter cake loss, and appropriate dimensions elsewhere to maintain belt stability and prevent slippage.

Inventive Principle:

Principle #3Local quality

3Device complexity

If fixed guides are used, then rotatable components are eliminated, but the sealing effect is reduced allowing dirt to pass unfiltered

Engineering Contradiction:

Improveelimination of rotary bearingsVSAvoidsealing between filter belt and guides

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent optimizes the geometric parameters of the fixed guides, specifically the arc radius and contact surface characteristics, to maintain adequate pressing force between the filter belt and guides throughout the entire guided length. This ensures reliable sealing that prevents dirt passage while eliminating complex rotary components.

Inventive Principle:

Principle #35Parameter changes

4Productivity

If the filter belt is conveyed continuously, then productivity is maintained, but the liquid pressure and throughput are reduced when liquid level is low

Engineering Contradiction:

Improvecontinuous filtration operationVSAvoidliquid volume in filter trough

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The fixed arc-shaped guides create a more favorable liquid distribution and pressure profile in the filter trough compared to circular arc guides. This equipotential-like distribution maintains adequate liquid pressure and throughput across the filter belt even when liquid levels vary, supporting continuous operation.

Inventive Principle:

Principle #12Equipotentiality

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

Ensures reliable continuous operation with constant friction and sealing, preventing filter cake loss and maintaining efficient liquid throughput without the need for rotary bearings.

Implementation Method 1

Liquid to be filtered is fed into the filter trough and passes through the filter belt, with dirt particles being deposited on the filter belt. The dirt particles form a desired filter cake, which improves a filter effect of the filter belt.

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Implementation Method 2

The advantage is an at least approximately constant friction between the filter belt and the belt guides over the entire guided belt length of the filter belt due to the constant radius of the belt guides.

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 3

Methodology Applied

Scientific EffectMechanical interlocking: Mechanical Fastener

Data Source

PatentEP1832325B9Belt filter

Publication Date: 2010.09.01 ERICH FETZER

Figure 1~2

AI summary

A belt filter assembly (10), with a box housing (12), has curved guides (18) at the inner side of the housing wall (16) to carry the filter belt (20) over the catch trough (14) for the filtrate. A permeable support belt (30) is at the filter trough (22), at the outer side of the filter belt with its inner side at the trough.