Lance Nozzle With Inclined Jets For Vertical Coating Removal
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Solution Overview
Problem
Conventional methods for removing excess sprayed coatings from the inner surfaces of crank chamber holes in multi-cylinder engines, such as those described in Japanese Unexamined Patent Application Publication No. 2008-303439, face difficulties in effectively removing coatings adhering in vertical directions, particularly from communication and journal holes, due to perpendicular high-pressure water injection.
Innovation Solution
A lance nozzle system with a shaft body featuring a first nozzle hole inclined towards the base end and a second nozzle hole inclined towards the leading end, generating jets that intersect with the rotational axis at specific angles to ensure effective removal of excess coatings from the inner surfaces of crank chamber holes, including those with vertical orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-pressure water is injected in a direction perpendicular to the axial direction of the nozzle (horizontal direction), then the water curtain can be formed to protect the sprayed coating on the cylinder bore, but the excess sprayed coating adhering on vertical surfaces (such as inner surfaces of communication holes and journal holes) cannot be sufficiently removed
Solution Approach 1:
The invention introduces a new injection dimension by tilting the nozzle at a specific angle (α) relative to the axial direction. This angular orientation allows the water jet to simultaneously achieve horizontal coverage for protecting the cylinder bore coating and vertical penetration for removing excess coating from holes, effectively adding a dimensional component to the injection trajectory.
Solution Approach 2:
The invention applies different injection characteristics to different regions: the tilted nozzle configuration provides targeted high-pressure injection toward vertical surfaces (communication holes, journal holes) while the water curtain formed by the injection geometry protects horizontal surfaces (cylinder bore). Each region receives the appropriate water flow characteristics for its specific cleaning needs.
2Device complexity
If conventional perpendicular high-pressure injection is used, then the injection system is simple in configuration, but it fails to remove excess sprayed coating from the inner surfaces of holes with vertical orientations
Solution Approach 1:
The invention modifies the injection parameter by changing the nozzle orientation angle from perpendicular (90 degrees to axial direction) to a tilted angle (α) relative to the axial direction. This parameter change enables the single nozzle to effectively address both horizontal and vertical surfaces, improving manufacturing precision of coating removal without significantly increasing device complexity.
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 lance nozzle system ensures more certain removal of excess sprayed coatings from the inner surfaces of crank chamber holes, including those with vertical orientations, by directing jets at appropriate angles to reach and remove coatings without damaging the necessary sprayed coatings on cylinder bores, thereby improving the efficiency of the coating removal process.
Implementation Method 1
The first nozzle hole (36) generates a first jet (J1) in a first injecting direction (F1) inclining to a base end side of the shaft body (33) with respect to a direction perpendicular to an axial direction (R22) of the shaft body (33). The second nozzle hole (35) generates a second jet (J2) in a second injecting direction (F2) inclining to a leading end side of the shaft body (33) with respect to a direction perpendicular to an axial direction (R22) of the shaft body (33).
Data Source
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AI summary
A lance nozzle (30) injecting fluid includes a shaft body (33), a first nozzle hole (36), and a second nozzle hole (35). The shaft body (33) internally includes a flow path (34) of the fluid. The first nozzle hole (36) is disposed on a leading end side of the shaft body (33), and generates a first jet (J1) in a first injecting direction inclining to a base end side of the shaft body (33) with respect to a direction perpendicular to an axial direction of the shaft body (33). The second nozzle hole (35) is disposed on a base end side of the first nozzle hole (36) in the shaft body (33), and generates a second jet (J2) in a second injecting direction inclining to a leading end side of the shaft body (33) with respect to a direction perpendicular to an axial direction of the shaft body (33).