Rotating Fluid Distributor With Inactive Sector for Preform Dust Removal
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Solution Overview
Problem
Existing dust removal devices for preforms made of thermoplastic material are inefficient due to the 'pressure plug' effect, which limits the depth of dust removal and increases air consumption, and are not satisfactory for large containers, leading to unsatisfactory dust removal and increased operating costs.
Innovation Solution
A rotating fluid distributor with a circular trajectory divided into active and inactive angular sectors, featuring a stator with a treatment gas supply pipe and a rotor with processing ports, allows each insufflation tube to move along specific sectors to minimize the pressure plug effect and ensure effective dust removal, optimizing the distribution of treatment gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the supply tube is offset from the axis of the preform to limit pressure surge during insertion, then the pressure surge is reduced, but the depth of tube insertion is limited and dust removal performance deteriorates
Solution Approach 1:
The system activates the blowing tube at a predetermined position before the tube reaches the bottom of the preform. The control unit detects the position of the blowing tube and activates it when the distal end is at a predetermined distance from the bottom, allowing dust removal to begin in advance while the tube is still moving downward, thus achieving both deep dust removal and pressure surge limitation
Solution Approach 2:
The system dynamically controls the activation timing of the blowing tube based on its real-time position during insertion. Rather than using a fixed offset position, the control unit adjusts when to activate the tube based on detected position, enabling optimal dust removal performance while managing pressure surge during the dynamic insertion process
2Quantity of substance
If air is continuously supplied during the descent phase of the tube, then dust is pressed against the internal surface, but dust removal efficiency is reduced
Solution Approach 1:
The system uses periodic rather than continuous air supply. The control unit activates the blowing tube only during specific phases: during insertion when the distal end is at a predetermined distance from the bottom, and during retraction when the distal end is at a predetermined distance from the top. This periodic activation reduces air consumption while maintaining effective dust removal
Solution Approach 2:
The system performs dust removal actions in advance during the insertion phase before the tube reaches the bottom, and continues during retraction. By activating the blowing tube during insertion at a predetermined distance from the bottom, dust is loosened and moved upward before the tube reaches its final position, improving overall dust removal efficiency while reducing total air consumption
3Manufacturing precision
If the tube is inserted deeper to improve dust removal, then dust removal performance is improved, but the pressure plug effect increases and air consumption increases
Solution Approach 1:
The system achieves deep dust removal效果 without physically inserting the tube to the bottom. By activating the blowing tube during insertion at a predetermined distance from the bottom, dust is loosened and moved upward in advance, achieving effective dust removal without the need for deep insertion that would cause pressure plug effect and excessive air consumption
Solution Approach 2:
The system uses the motion of the blowing tube itself during insertion and retraction to enhance dust removal. The downward motion during insertion and upward motion during retraction naturally move dust particles, reducing the need for continuous high-pressure air supply and minimizing the pressure plug effect while maintaining effective dust removal
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 enhances dust removal efficiency by allowing the insufflation tube to align with the preform axis, reducing the distance and minimizing the inactive sector, thus improving the dust removal performance and reducing air consumption, leading to increased reliability and cost-effectiveness.
Implementation Method 1
blowing means consisting of tubes capable of blowing compressed air into the preform
Implementation Method 2
injecting a pressurized gas... capable of simultaneously removing the blown air and dust from the preform
Data Source
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AI summary
The invention relates to a rotating fluid distributor (60) which comprises a fixed stator (62) and an external rotor (64) rigidly connected to the carousel (32) which comprises at least one treatment port (66A) connected to at least one inflation tube (54), a distribution chamber (70A) being arranged radially between the stator (62) and the rotor (64), characterised in that the stator (62) comprises a fixed closure surface (82A) which closes off each treatment port (66A) within an angular sector of their circular trajectory, which sector is referred to as an 'inactive angular sector' (72-OFF). The invention also relates to a device (20) for treating the inside of preforms (22) which comprises such a rotating fluid distributor (60).