Displacing Piston Filter for High-Viscosity Fluids
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Solution Overview
Problem
Existing filtering devices for high-viscosity fluids, such as plastic melts, experience prolonged fluid residence times due to enlarged discharge channel diameters required for effective backwashing, leading to potential thermal changes during filtration.
Innovation Solution
Incorporating a displacing piston with an inner fluid line and matching outer diameter to the partial channel, allowing the piston to position its outlet in front of the discharge channel during production and retracting for backwashing, thus minimizing fluid reservoir volume and reducing residence times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the partial channel diameter is enlarged to increase fluid volume for effective backwashing, then the backwash effectiveness is improved, but the residence time of fluid in the partial channel is prolonged leading to thermal risks
Solution Approach 1:
The partial channel is segmented into two functional zones: a first section with a smaller first diameter for fluid discharge during production, and a second section with a larger second diameter for fluid storage during backwashing. This segmentation allows the system to achieve both rapid fluid discharge (short residence time) and sufficient fluid volume for effective backwashing, resolving the contradiction between backwash effectiveness and thermal risk.
2Ease of operation
If the displacing piston is retracted to allow fluid access to the partial channel for backwashing, then the backwash function is enabled, but the fluid residence time in enlarged areas increases causing thermal changes
Solution Approach 1:
The partial channel is divided into a first section with smaller diameter for rapid fluid discharge and a second section with larger diameter for fluid storage. This segmentation enables the displacing piston to retract and access fluid in the second section for backwashing while limiting the fluid residence time in the first section, thereby reducing thermal changes.
Solution Approach 2:
Different sections of the partial channel have different diameters optimized for different functions: the first section has a smaller diameter suited for rapid discharge during production, while the second section has a larger diameter suited for storing fluid volume for backwashing. This local differentiation of geometric properties resolves the contradiction between enabling backwash and minimizing thermal effects.
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 minimizes fluid residence times in enlarged areas, maintains continuous flow without pressure loss during production, and ensures effective backwashing without exposing unnecessary channel sections to the displacing piston, reducing thermal risks.
Implementation Method 1
a displacing piston for each partial channel that leads away from a screen location and where said displacing pistons can dip into the partial channels on the clean side. A blockage of the discharge channel is effected at the moment when the displacing pistons are inserted into the partial channels.
Implementation Method 2
The displacing piston pushes the fluid located in the partial channel in the flow direction opposite to the one during production operation into the screen space and from behind through the filter element in order to loosen build-up on said filter element.
Implementation Method 3
Each of these screen carrier elements has at least one screen location where a screen space is formed. At least one filter element is placed in each screen space.
Data Source
AI summary
A filtering device (100) for high-viscosity fluids has a partial channel (34) in the housing (30) and a displacing piston (40) which can be inserted into the partial channel (34, 35). The displacing piston (40) has at least one inner fluid line (42) that extends from an inlet opening (41) therein to an outlet opening (43) on its circumference. The outer diameter of the displacing piston (40) corresponds to the inside diameter of the partial channel (34, 35). The displacing piston (40) can be positioned, in a production position, with its outlet opening (43) in front of the inlet of the discharge channel (33) into the partial channel (34, 35) and can be retracted to a backflushing initial position within the partial channel (34). Along a backflushing travel path of the displacing piston, the inlet of the discharge channel (33) into the partial channel (35) is covered by the outer wall of the displacing piston (40) and/or the outlet opening (43) of the displacing piston (40) is covered by the inner wall of the partial channel (34).