Perforated Riser Debris Flushing for Irrigation Sprinklers
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Solution Overview
Problem
Rotor-type sprinklers face operational impairment due to debris entering the gap between the nozzle housing and the riser, leading to improper function and eventual failure from accumulated debris, despite existing designs that attempt to minimize debris entry through narrow gaps and small flush holes.
Innovation Solution
The sprinkler features a perforated riser with circumferentially spaced flush slots that allow debris to be carried out with flowing water during extension and retraction cycles, ensuring the sediment basin is flushed of debris and reducing the risk of debris entering, with the slots designed to intersect the gap and extend below the riser seal for effective flushing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single small circular flush hole is provided in the riser, then debris can be expelled from the sediment basin, but debris can still enter the sediment basin through the circumferential gap during extension and retraction cycles
Solution Approach 1:
The single circular flush hole is segmented into multiple circumferential slots around the riser. This segmentation allows debris to be expelled from multiple locations simultaneously and prevents debris from entering at any single point, as water flows outward through all slots during extension and retraction cycles
Solution Approach 2:
The flush hole is transformed from a point feature (circular hole) to a surface feature (circumferential slots). This dimensional change increases the flushing surface area and creates multiple ejection points around the entire circumference of the riser, effectively covering all potential debris entry paths through the gap
2Object-affected harmful factors
If the gap between the nozzle housing and riser is made narrow to prevent debris entry, then debris protection is improved, but the risk of operational impairment from accumulated debris remains
Solution Approach 1:
The circumferential slots are positioned to intersect the gap between the nozzle housing and riser, creating a preliminary barrier that prevents debris from entering the sediment basin in the first place. During extension and retraction, water flows through these slots before debris can accumulate, proactively preventing the harmful effect rather than just reacting to it
3Reliability
If multiple circumferential flush slots are provided in the perforated riser, then the sediment basin is consistently flushed of debris, but the device complexity increases
Solution Approach 1:
The riser is designed with a porous upper portion containing multiple circumferential slots. This porous structure allows water and debris to pass through during extension and retraction cycles, providing consistent flushing action. The slots are integrated into the riser body as a continuous feature rather than separate components, maintaining structural simplicity while achieving reliable debris removal
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 design ensures the sediment basin is consistently flushed of debris, reducing the risk of operational impairment and extending the lifespan of the sprinkler by preventing wear on seals and bearing surfaces, maintaining proper rotation and preventing leaks or slowdowns.
Implementation Method 1
pressurized water that has filled the outer case enters the sediment basin in the riser by flowing inwardly through the flush hole and then leaves the sediment basin through the gap, expelling debris in the process
Implementation Method 2
A riser seal is positioned and configured to substantially prevent water from escaping between the riser and the outer case when the riser is extended
Implementation Method 3
The drive assembly includes a turbine, gear train reduction, and reversing mechanism mounted inside the riser. The drive assembly rotates the drive shaft and the nozzle housing when pressurized water is supplied to the outer case
Data Source
AI summary
A sprinkler includes an outer case having an upper end and a tubular riser telescopically mounted in the outer case for extension and retraction from the upper end of the case. The riser has an upper portion with a plurality of circumferentially spaced apertures sized to allow debris to be carried through the apertures with flowing water. A riser seal is positioned and configured to substantially prevent water from escaping between the riser and the outer case when the riser is extended. A drive assembly is mounted inside the riser and includes a drive shaft that is co-axially mounted at an upper end of the riser and rotates when pressurized water is supplied to the outer case. A cylindrical nozzle housing is co-axially coupled to the drive shaft and is rotatable relative to the riser. The nozzle housing is positioned and configured to define a gap between an outer cylindrical wall of the nozzle housing and a complementary outer cylindrical wall of the tubular riser. The apertures in the upper portion of the riser intersect the gap and are configured and sized to receive pressurized water below the riser seal when the riser is retracted.