Axial Spray Nozzle Venting to Stabilize the Shutter Valve
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Solution Overview
Problem
Existing axial oil nozzles exhibit unstable and unpredictable behavior due to back pressure, leading to vibratory shutter movement, pressure drop, and accelerated wear of components, and are not suitable for reduced radial sizes.
Innovation Solution
An axial fluid nozzle with a radially vented valve design, featuring a tubular sleeve and holding member with a radial vent channel, isolating the compression spring from the fluid flow, which reduces back pressure and stabilizes the shutter, preventing wear and improving responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the compression spring is placed directly in the fluid flow passage, then the nozzle structure is simplified, but the spring operation is disrupted and mechanical reactivity is impaired
Solution Approach 1:
The nozzle is divided into two separate chambers: a first chamber for fluid flow and a second chamber for housing the compression spring. This segmentation isolates the spring from the fluid flow, preventing disruption of spring operation while maintaining structural simplicity through the integrated chamber design.
2Volume of moving object
If the axial oil nozzle is used with reduced radial size, then the device compactness is improved, but the radial configuration cannot be used
Solution Approach 1:
Instead of using a radial oil nozzle configuration, the invention inverts to an axial oil nozzle design where the internal duct extends axially through the piston. This inversion allows for reduced radial size while maintaining effective oil delivery functionality through the axial passage and spray holes.
3Reliability
If the shutter is pushed back by compression spring to obstruct valve seat opening, then the valve is sealed when pressure is low, but back pressure causes vibratory behavior
Solution Approach 1:
The compression spring is extracted from the fluid flow passage and placed in a separate second chamber. This removal eliminates the source of back pressure acting on the spring, preventing vibratory shutter behavior while maintaining effective valve sealing through the spring's continued engagement with the shutter.
4Productivity
If oil pressure overcomes compression spring force to push shutter back, then the valve opens and oil flow is enabled, but pressure drop occurs during flow
Solution Approach 1:
A valve guide is introduced as an intermediary component between the shutter and valve seat. The valve guide provides a precise seating surface and guidance for the shutter, improving the efficiency of pressure-to-flow conversion and reducing unnecessary pressure drops during oil flow while maintaining reliable valve opening and closing action.
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 enhances the nozzle's responsiveness, reduces pressure drop, and extends the lifespan of components by eliminating vibratory behavior and maintaining mechanical reactivity, allowing higher fluid jet speeds under the same pressure.
Implementation Method 1
a shutter (70) mounted for axial sliding in the channel (51) of the jacket (50), the shutter being pushed against the opening (31) of the valve seat (30) by a compression spring (80)
Implementation Method 2
The valve guide (40) further comprises a radial vent (90), which comprises a vent channel (91) sealed off from fluid flow and connecting the interior of the tubular guide liner, at the reserve section (55b), to a through radial bore (92) formed in the nozzle body (20)
Implementation Method 3
As soon as the oil pressure at the inlet of the nozzle is sufficient to overcome the force exerted by the compression spring on the shutter, the latter is pushed back towards the inside of the nozzle
Data Source
Figure 1a~1b
Figure 2
Figure 3~4
AI summary
The invention relates to a spray nozzle comprising: - a body (20) comprising a duct (21), - a seat (30) arranged at the first end (21a), and including an opening (31) forming an inlet (22a), - a guide (40) comprising a tubular jacket (50) and a retaining member (60), the retaining member (60) retaining the jacket (50) in the duct (21), -a shutter (70) mounted to slide axially in the channel (51) of the jacket (50), the shutter (70) being pushed back against the opening (31) by a spring (80), and in abutment against the bottom (53) of the jacket (50), the guide (40) comprising a radial vent (90), which comprises a vent channel (91) isolated from the flow of fluid and connecting the inside of the guide jacket (50) to a bore (92) formed in the body of the spray nozzle (20).