Coating Agent Pump Layout for Low-Loss Color Change
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Solution Overview
Problem
Conventional coating installations experience high color change losses, long press-on times, and significant coating agent consumption due to the arrangement of the circulation and pressure lines, which require extensive flushing and rinsing, leading to inefficiencies and material waste.
Innovation Solution
A coating agent pump with integrated circulation and return connections directly branching from the pump, allowing for shortened line lengths and controlled fluid flow, along with controllable valves to manage the flow of coating agent and rinsing agent during color changes and rinsing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the circulation line is connected to the pigging station instead of the pump, then the system can maintain conventional architecture, but the line length increases causing high color change losses and long press-on times
Solution Approach 1:
The circulation connection is extracted from the pigging station and relocated directly to the pump outlet. This extraction shortens the circulation line length, enabling rapid color changes with minimal coating agent loss while maintaining the necessary circulation function.
Solution Approach 2:
The system is segmented into distinct functional zones: the pump handles coating agent transfer, the circulation connection manages residual material recovery, and the pigging station handles distribution. This segmentation allows each component to be optimized independently, with the circulation line being shortened to reduce losses.
2Reliability
If the pressure line and circulation line are flushed during color change, then residual coating agent is removed, but high color change losses occur and large amounts of rinsing agent are consumed
Solution Approach 1:
The circulation connection is prepared in advance by positioning it to receive residual coating agent directly from the pump outlet. During color change, this pre-positioned connection enables rapid recovery of residual material without requiring extensive flushing of the entire pressure line.
Solution Approach 2:
Instead of discarding residual coating agent in the pressure line through extensive flushing, the system recovers it via the circulation connection that directs residual material back to the paint supply or dirt thinner receptacle, minimizing both coating agent and rinsing agent consumption.
3Length of stationary object
If the pressure line length is increased to reach distant applicators, then the system can serve farther locations, but the press-on time increases significantly
Solution Approach 1:
The fluid path is segmented into the pressure line for new coating agent delivery and the circulation line for residual material recovery. This segmentation allows the pressure line to be optimized for length to reach distant applicators while the circulation line remains short for rapid residual clearing during color changes.
Solution Approach 2:
The system dynamically switches between pressure line flow (for coating application) and circulation line flow (for residual clearing) based on operational needs. This dynamic operation allows the pressure line to be long for reach while the circulation line provides rapid response for color changes.
4Reliability
If conventional flushing procedures are used during color change, then the lines are cleared of residual coating agent, but solvent remains in the components requiring additional pump strokes to remove
Solution Approach 1:
The circulation connection extracts residual coating agent and solvent from the pump outlet directly, bypassing the need to flush the entire pressure line. This extraction mechanism removes residual materials in fewer pump strokes, reducing additional coating agent consumption.
Solution Approach 2:
The circulation connection acts as an intermediary that receives residual materials from the pump outlet and directs them to the dirt thinner receptacle or paint supply. This intermediary function eliminates the need for extensive flushing operations and reduces the number of additional pump strokes required.
Data Source
AI summary
The disclosure relates to a coating agent pump for conveying a coating agent in a coating installation, having a pump inlet, an inlet section, a pump outlet and an outlet section. The coating agent pump according to the disclosure additionally has an outlet-side circulation connection for discharging the coating agent into a circulation line that leads back to a paint supply. Furthermore, the disclosure comprises a corresponding coating installation and an associated operating method.