Screw Filter Press Dynamic Gap Control for Wear Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Screw filter presses face challenges with maintaining reliable operation and tightness under high process temperatures and mechanical stress, leading to wear and increased maintenance needs, especially in continuous operations with varying thermal loads and exposure to foreign objects.
Innovation Solution
The screw filter press design includes a permeate flow outlet subjected to negative pressure, a pressing unit that exerts force on the drive shaft or rotating screw, and a control unit with flow sensors to maintain a defined gap distance between the roller and filter element, ensuring reliable operation and low wear through adjustable contact pressure and position control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the screw filter press operates under high process temperatures and mechanical stress, then filtration efficiency is maintained, but wear increases and maintenance needs increase
Solution Approach 1:
The patent implements a dynamically adjustable gap width between the rotary screw and filter element through a pressing unit with variable force application. This dynamic adjustment allows the system to adapt to wear over time and varying operational conditions, maintaining optimal filtration efficiency while extending maintenance intervals by compensating for component degradation.
Solution Approach 2:
The pressing unit modifies the contact force and gap width parameters between the rotary screw and filter element based on operational conditions. By changing these parameters dynamically, the system maintains reliable operation under high temperatures and mechanical stress while reducing wear through optimized contact conditions.
2Productivity
If the gap width between rotary screw and filter element is reduced to increase filtration efficiency, then separation performance improves, but wear and maintenance needs increase
Solution Approach 1:
The pressing unit enables dynamic adjustment of the gap width between the rotary screw and filter element. This allows the system to optimize the gap width for filtration efficiency while controlling the contact pressure to minimize wear, rather than maintaining a fixed narrow gap that would cause excessive wear.
Solution Approach 2:
The system changes the gap width parameter dynamically through the pressing unit, allowing optimization of both filtration efficiency and wear reduction. The variable force application adjusts the contact conditions to achieve high separation performance without excessive wear.
3Ease of manufacture
If a fixed gap design is used to simplify construction, then manufacturing is easier, but adaptation to varying operational conditions and wear is limited
Solution Approach 1:
The pressing unit introduces a dynamic adjustment mechanism that allows the gap width to be varied based on operational conditions and wear. This maintains relatively simple construction while adding the capability to adapt to changing conditions, extending component life, and optimizing performance.
Solution Approach 2:
The pressing unit is pre-configured to apply variable force to maintain optimal gap width compensation for wear. This preliminary setup allows the system to automatically adapt to wear and varying conditions without complex real-time control systems.
4Productivity
If high contact pressure is applied between scraper and filter element to improve cleaning effect, then filtration efficiency increases, but wear on components increases
Solution Approach 1:
The pressing unit enables dynamic adjustment of the contact pressure between the scraper and filter element. This allows optimization of the cleaning effect through sufficient contact pressure while controlling the force to minimize wear on the scraper and filter element, rather than using consistently high pressure.
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 long-term optimal filtration results with reduced maintenance, maintaining tightness and filtration efficiency even under demanding conditions, suitable for applications in the food, biotechnology, and chemical industries.
Implementation Method 1
a filter element, which is connected to the inside of the housing and at least partially surrounds the rotary screw, is provided. The rotary screw and the filter element form a gap zone which, at least partially, constitutes a filtration zone
Implementation Method 2
the suspension stream is subjected to pressure from the rotating screw as it passes through the gap zone
Implementation Method 3
a permeate flow outlet is connected in the area of the filter element on the housing, which can be subjected to a vacuum
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A screw filter press (10) for filtering and/or concentrating a fluid, solids-laden suspension stream (S) with a motor (M) driving a motor shaft (50), which, via a coupling (51), drives a drive shaft (52) rotatably mounted, a housing (40) with a head region (K) and a foot region (F) is sealed to the motor (M), a rotary screw (20) is provided inside the housing (40) having a roller (21) and at least one laterally connected scraper body (23), a filter element (22) is provided, the rotary screw (20) and the filter element (22) form a gap zone (25), a separation chamber (24) adjoins the outside of the filter element (22), and an inlet (33) for the suspension stream (S) is connected to the housing (40) in the foot region (F). is, a permeate flow drain (31) is connected,a retentate flow outlet (32) is connected to the housing (40) in the head region (K), characterized in that the roller (21) is shaped to widen at least partially, in particular conically, on the outside/inside of the filter element (22) along its longitudinal axis/axis of symmetry in the direction of the head region (K), i.e., it has an increasing outer diameter/inner diameter, and the drive shaft (52) and the rotary screw (20) are mounted to be longitudinally displaceable along a displacement direction (V) coaxial with the axis of rotation (W).