Inlet Channel Constriction for Wet Paint Overspray Separation
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Solution Overview
Problem
Existing devices for separating wet paint overspray from raw gas flows in coating systems are inefficient in applying auxiliary materials to filter elements, leading to insufficient protection against overspray adhesion and requiring additional nozzle arrangements and temporary closure of flow paths.
Innovation Solution
A device with an inlet opening designed as an inlet channel that narrows to a constriction, ensuring a high flow rate, and an auxiliary material receptacle with a guide surface inclined to direct the raw gas flow into the receptacle, preventing auxiliary material from entering the application area and allowing efficient distribution of auxiliary material within the filter device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If auxiliary material is introduced into the raw gas flow through a nozzle arrangement, then the filter elements are protected from overspray adhesion, but auxiliary material may get into the application area and additional closing devices are required
Solution Approach 1:
The inlet opening and auxiliary material receptacle are merged into a single integrated structure. The raw gas flow enters through the inlet opening and directly contacts the auxiliary material in the receptacle, combining the functions of material introduction and flow guidance without requiring separate nozzle arrangements or closing devices
Solution Approach 2:
The auxiliary material introduction function is extracted from the main flow path and placed in a dedicated receptacle at the inlet. This separates the material storage function from the gas flow path, eliminating the need for closing devices while ensuring material is introduced at the optimal location
2Object-affected harmful factors
If the raw gas flow rate is increased to prevent auxiliary material from counter-flowing into the application area, then material contamination is prevented, but the energy consumption and flow resistance increase
Solution Approach 1:
The auxiliary material is positioned in the receptacle before the raw gas flow enters the filter device. The material is ready in advance at the inlet opening, allowing immediate contact with the incoming gas flow without requiring excessive flow rates to prevent counter-flow contamination
Solution Approach 2:
The inlet opening acts as an intermediary structure that guides the raw gas flow to contact the auxiliary material in the receptacle. This intermediate structure ensures unidirectional flow and prevents auxiliary material from counter-flowing into the application area without requiring high flow rates
3Object-affected harmful factors
If the inlet opening is designed as a narrow channel with constriction, then the raw gas flow rate increases and auxiliary material is prevented from counter-flowing, but the flow resistance and pressure drop increase
Solution Approach 1:
The inlet channel has a constriction only at the critical section where counter-flow prevention is needed. The channel cross-section widens before and after this constriction, maintaining low flow resistance overall while creating sufficient velocity at the narrowest point to prevent auxiliary material from counter-flowing into the application area
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 configuration ensures effective separation of wet paint overspray, prevents auxiliary material from reaching the application area, and allows continuous operation without interrupting the painting process, enhancing the efficiency of filter element cleaning and overspray removal.
Implementation Method 1
the inlet opening (212) is designed as an inlet channel (214) whose cross section narrowing in the direction of flow of the raw gas stream (120) up to a constriction (240)... the guide surface (224, 232)... direct the raw gas flow into the receptacle
Implementation Method 2
at least one filter element (172) for separating the overspray from the raw gas flow (120)
Implementation Method 3
which material absorbs and/or binds the wet paint overspray well
Implementation Method 4
the auxiliary material is used to form a barrier layer on the surfaces of the filter element
Data Source
Figure 1
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AI summary
A filter element separates off an over-spray from a flow of raw/crude gas. A tank for holding auxiliary material holds a filtering auxiliary material. A filtering device (132) has an inlet, through which the flow of raw/crude gas is directed into the tank for holding auxiliary material so as to run into the filtering device. Independent claims are also included for the following: (1) A device for separating off wet-paint over-spray from a flow of raw/crude gas containing over-spray particles; (2) Equipment for painting objects like vehicle bodywork; (3) A method for separating off wet-paint over-spray from a flow of raw/crude gas containing over-spray particles.