Washing Apparatus Casing Reinforcement for Pulp Deformation Control
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Solution Overview
Problem
Existing washing apparatuses for cellulose pulp have high dead weight due to sensitive axial seals and heavy structural frameworks, leading to increased material consumption, complex manufacturing, and difficulties in setup and transportation.
Innovation Solution
A washing apparatus with a rotatable drum and a stationary cylindrical casing supported by transverse beams, featuring a reinforcing frame rib that encircles the casing to minimize deformation and reduce weight, while maintaining functional efficiency through axial seals and separate zones for pulp formation, washing, and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If heavy structural frameworks with multiple beams and stiffening sheets are used, then deformation of the pressurized space is minimized, but dead weight and material consumption increase significantly
Solution Approach 1:
The reinforcing frame is segmented into a modular structure consisting of longitudinal beams connected by transverse beams, with discrete reinforcing sheets positioned at specific locations rather than continuous coverage. This segmentation maintains structural integrity while reducing overall material consumption and dead weight.
Solution Approach 2:
Reinforcing sheets are strategically positioned only in areas requiring additional support within the pressurized space, rather than applying uniform reinforcement throughout. This local quality approach ensures deformation control is achieved precisely where needed while minimizing unnecessary material usage and weight.
2Productivity
If axial seals are used to separate washing zones, then washing efficiency is maintained, but sensitivity to geometrical deviations increases and leakage risk arises
Solution Approach 1:
The reinforcing frame structure is designed to preemptively counteract the effects of internal overpressure before it can cause geometrical deviations that would compromise seal functionality. By providing pre-calculated structural support, the system prevents deformation that would otherwise lead to seal leakage or failure.
Solution Approach 2:
The heavy-duty reinforcing framework acts as a cushioning structure that absorbs and distributes the stresses from internal pressure before they can transmit to the axial seals. This beforehand cushioning protects the seals from the harmful effects of pressure-induced deformation, maintaining their reliability and preventing leakage.
3Strength
If heavy frameworks and solid stiffening sheets are used, then structural strength is improved, but manufacturing complexity and production cost increase
Solution Approach 1:
The reinforcing structure is divided into separate modular components (longitudinal beams, transverse beams, and discrete reinforcing sheets) that can be manufactured independently and assembled together. This segmentation simplifies the manufacturing process compared to producing large monolithic structures, while maintaining the required structural strength through proper component design and arrangement.
4Stability of the object's composition
If heavy dead weight structure is used, then deformation is minimized, but setup and transportation become more difficult and expensive
Solution Approach 1:
The modular segmented structure allows the washing apparatus to be disassembled into manageable components for transportation and reassembled at the installation site. This segmentation reduces the complexity of setup operations compared to installing a single heavy monolithic structure, while the reinforced design ensures form stability is maintained once assembled.
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
The solution results in a lighter, more cost-efficient, and simpler construction with reduced material consumption, maintaining the same level of deformation control as traditional apparatuses, thus improving manufacturing efficiency and reducing setup challenges.
Implementation Method 1
The static pressure causes the displaced liquid to pass through a perforated metal sheet arranged on the rotatable drum
Implementation Method 2
the filtrate at overpressure is caused to pass through the metal sheet. The increase in the pressure difference results in an improved dewatering of the pulp
Implementation Method 3
The axial seals are located between the rotating drum and the surrounding casing. The gap between a seal and the drum is reduce to a minimum and is kept constant
Data Source
AI summary
The present invention relates to a washing apparatus for washing of cellulose pulp comprising: a rotatable drum (2), a stationary support (14), a stationary cylindrical casing (18), that encloses the drum, whereby an annular space (20) is defined between the casing and the drum, a number of seals (22) that are arranged on the casing and that seals between the casing and the drum, such that the annular space is divided in a formation zone (F), at least one washing zone (T1, T2), and a discharge zone (U), and at least a reinforcing frame rib (24), that is attached to the casing. The reinforcing frame rib (24) extends around the entire casing (18) for fixing the casing in a predetermined form, whereby detrimental deformation of the casing (18), when washing the paper pulp at overpressure, is prevented.