Non-Stick Housing for Thermal Coating of Small Bore Diameters
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Solution Overview
Problem
Existing thermal coating devices for internal combustion engine cylinder bores face issues with high thermal loads, turbulence, and particle adhesion, leading to reduced efficiency and maintenance challenges, especially when coating smaller bore diameters.
Innovation Solution
A rotating single-wire spraying device with a non-stick and insulating housing and nozzle ring design, featuring a ceramic nozzle ring and a metallic housing with a non-detachable non-stick surface, optimized for reduced particle adhesion and improved heat dissipation, along with a flow-optimized surface design to minimize turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional thermal coating devices are used for coating small bore diameters, then coating capability is achieved, but particle adhesion to the device increases and maintenance frequency increases
Solution Approach 1:
The housing surface properties are changed by applying a non-stick coating layer, which fundamentally alters the interaction between particles and the housing surface. This parameter change prevents particle adhesion without affecting the coating process capability.
Solution Approach 2:
The housing is constructed as a composite structure with an inner non-stick coating layer applied on the housing material. This composite design combines the structural integrity of the housing with the non-adhesive properties of the coating layer, solving both coating capability and particle adhesion issues.
2Object-generated harmful factors
If the housing surface is made smooth to reduce particle adhesion, then particle adhesion decreases, but heat dissipation from the housing deteriorates
Solution Approach 1:
The housing employs a composite structure where the base housing material provides thermal conductivity for heat dissipation, while the applied non-stick coating layer provides the smooth non-adhesive surface. This composite approach allows both heat dissipation and particle adhesion prevention to coexist.
Solution Approach 2:
The non-stick coating is applied specifically to the inner housing surface where particle adhesion is problematic, while the outer housing structure maintains its original thermal properties. This localized application preserves heat dissipation capability while addressing particle adhesion only where needed.
3Strength
If the housing is made electrically conductive for structural integrity, then structural strength is maintained, but particle accumulation due to electrostatic charge increases
Solution Approach 1:
The housing structure combines conductive base material for structural integrity with a non-conductive non-stick coating layer on the inner surface. This composite design allows the housing to maintain electrical conductivity for structural purposes while the coating layer prevents electrostatic particle accumulation.
Solution Approach 2:
The non-stick coating layer acts as an intermediary between the conductive housing and the spray particles. It prevents direct contact between particles and the conductive surface, thereby eliminating electrostatic particle accumulation while preserving the housing's structural electrical properties.
4Object-generated harmful factors
If a removable protective jacket is added to prevent particle adhesion, then particle adhesion is reduced, but device complexity and ease of operation deteriorate
Solution Approach 1:
The non-stick coating is applied in advance to the housing surface during manufacturing, creating a permanent protective layer. This preliminary action eliminates the need for removable protective jackets, simplifying the device structure while maintaining particle adhesion prevention.
Solution Approach 2:
The non-stick coating provides self-service by continuously preventing particle adhesion without requiring external protective components. The housing surface itself becomes protective through the coating, eliminating the need for additional removable jackets and simplifying operation.
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 enables stable and efficient thermal coating of small bore diameters with reduced maintenance, higher application rates, and extended service life by preventing particle adhesion and maintaining process stability.
Implementation Method 1
at least the housing (6) has a non-stick and insulating layer system, with a non-detachable non-stick surface (36) being arranged on an electrically and thermally insulating layer (29) which is arranged on the housing (6)
Implementation Method 2
an electrically and thermally insulating layer (29) which is arranged on the housing (6)
Implementation Method 3
The device (1) is inserted into a cylinder bore to be coated and rotated around itself during operation with a simultaneous linear up and down movement. It can be seen that during the rotation of the device the process gases flowing in the cylinder bore flow through flat surfaces of the device
Data Source
Figure 1
Figure 1a
Figure 2
AI summary
The invention relates to an apparatus for thermally coating a surface, comprising at least one housing (6), a cathode (9), which is designed as a consumable wire, and at least one insulation element (13), the housing (6) having a non-detachable anti-adhesive surface.