Eccentric Flow Channel in Rotatable Bolt for Polymer Melt
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Solution Overview
Problem
Existing devices for controlling plastic melt conduction, such as screen changers and diverter valves, are material-intensive, energy-intensive, and prone to leakage due to complex designs and inefficient sealing, leading to infrequent screen changes and material wastage.
Innovation Solution
A compact drain valve design with an eccentrically arranged flow channel in a rotatable bolt, featuring a blind hole and diagonal drain channel, which allows for efficient material handling and conversion into a screen changing device with minimal components, along with thermal decoupling of the drive components to prevent heat loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a central bore is arranged in the bolt for material flow, then the valve can be compact, but the overlap between the valve pin and housing is too small causing leakage
Solution Approach 1:
The flow channel is arranged eccentrically in the rotatable bolt, offset from the center axis. This asymmetric arrangement increases the overlap area between the valve pin and housing, ensuring reliable sealing and preventing leakage during filter operation while maintaining compact dimensions
2Ease of operation
If screen changes occur infrequently (every few days to a week), then operation is simpler, but the screen carrier becomes encrusted and moves stiffly
Solution Approach 1:
The valve incorporates a self-cleaning function where the flow channel arrangement and flushing mechanism automatically remove encrustations from the screen carrier during operation, enabling frequent screen changes without manual intervention or loss of mobility
3Reliability
If a lot of material is heated for diverter valve operation, then the valve works reliably, but energy costs are considerable
Solution Approach 1:
The design extracts and removes material that would otherwise require heating by providing a drain channel that leads to the outside of the housing. This allows unheated or partially heated material to be discharged separately, reducing the total amount of material that needs to be maintained at processing temperature and thereby reducing energy consumption
4Productivity
If the flow channel cross section corresponds to the guide channel cross section, then material flow is efficient, but the valve becomes material-intensive
Solution Approach 1:
The flow channel cross-section is adapted to match the guide channel cross-section only in the critical flow areas, while other portions of the valve use reduced material thickness. This localized optimization maintains efficient material flow where needed while reducing overall material consumption and weight
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
Reduces material and energy costs by providing enough space for the blind hole and drain channel, enabling frequent screen changes without leakage and allowing for various functions with fewer components, while maintaining the plastic melt's temperature with heating cartridges.
Implementation Method 1
maintaining the plastic melt's temperature with heating cartridges
Implementation Method 2
a control member a rotatable bolt is provided which has a flow channel for the plastic melt and which can be rotated via a rotary arm from a first to a second position
Data Source
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AI summary
The invention relates to a device for the controlled guidance of a polymer melt. Said device comprises a housing (1) having an inlet channel (5) and an outlet channel (6) for the polymer melt in which housing a control element can be displaced between the exits of the inlet channel (5) and the outlet channel (6) perpendicular to the inlet channel (5) and the outlet channel (6) in a sealing manner. A rotatable pin (2, 15) is used as the control element and has a flow channel (3, 16) for the polymer melt to flow through and can be rotated from a first to a second position by means of a rotary arm (9). The aim of the invention is to provide a device of the above type which is compact, inexpensive and allows various functions to be carried out with few different components. For this purpose, the flow channel (3, 16) is eccentric in relation to the rotatable pin (2, 15).