Dual Blower Cylinder Bore Coating Airflow Control
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Solution Overview
Problem
Existing coating devices for cylinder bores in crankcases face challenges in maintaining a strong and uniform air flow, especially in larger systems, due to complex hood designs and exhaust air line configurations, which can be difficult to implement and control effectively.
Innovation Solution
The integration of a second blower upstream of the cylinder bore, in addition to the first blower downstream, generates overpressure, enhancing and controlling the air flow through the cylinder bore by actively inflating the supply air, allowing for a more precise and reinforced air flow during the coating process. This setup is suitable for retrofitting existing devices with a hood and work table configuration, eliminating the need for filter or separator elements between the fan and cylinder bore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single blower is used to generate vacuum for suctioning plasma during coating, then the device complexity is low, but the air flow strength and uniformity are insufficient especially in larger systems
Solution Approach 1:
The air flow generation system is segmented into two independent blowers: a first blower positioned downstream to generate vacuum for plasma suction, and a second blower positioned upstream to generate overpressure for air supply. This segmentation allows each blower to specialize in one function, achieving stronger and more uniform air flow through the cylinder bore while maintaining manageable system complexity through modular design
2Productivity
If a complex hood design is used to accommodate multiple crankcases, then the air flow coverage is improved, but the ease of operation and control deteriorate
Solution Approach 1:
The air pressure distribution is optimized with local quality by positioning the second blower upstream to create localized overpressure zones at each crankcase position. This allows independent control of air supply to different areas under the hood, improving coverage while maintaining ease of operation through localized adjustment capabilities
3Ease of operation
If passive air suction is used without active pressurization, then the device complexity is low, but the air flow controllability and precision are insufficient
Solution Approach 1:
The dual blower system establishes a feedback-controlled air flow mechanism where the second blower's overpressure generation responds to coating process requirements, and the first blower's vacuum generation adjusts accordingly. This coordinated control provides precise air flow management through the cylinder bore, improving controllability while keeping the system manageable through standardized blower components
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 solution ensures a stronger and more controllable air flow through the cylinder bore, improving the efficiency and precision of the coating process, particularly beneficial for larger systems with multiple crankcases under a single hood, by actively managing air flow and reducing the complexity of air guidance systems.
Implementation Method 1
a vacuum is generated above the crankcase, the air is pulled through the supply air line, the air passage of the work table and the cylinder bore
Implementation Method 2
the cylinder bore is recovered with a constant, axial pressure gradient
Implementation Method 3
a second fan upstream of the cylinder bore is provided, which generates or generates an overpressure there
Data Source
Figure 1
AI summary
The invention relates to a device for coating a cylinder bore (121) in a crankcase (12) for an internal combustion engine, comprising a coating device (14) that can be inserted into the cylinder bore (121) and a suction device by means of which the cylinder bore (121) can be subjected to an axial pressure gradient, wherein the suction device has a first blower (24) switched to generate a negative pressure in the suction direction downstream of the cylinder bore (121). The invention is characterized in that the suction device has an additional second blower (30) switched to generate a positive pressure in the suction direction upstream of the cylinder bore (121), which is distinct from the first blower (24).