Outlet Pipe Flow Regulation to Prevent Post-Shutoff Dripping
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Solution Overview
Problem
Sanitary outlet fittings with concavely curved outlet pipes often experience prolonged dripping or running of residual fluid after the fluid supply is shut off due to air bubble compression and dynamic pressure buildup, especially when flow-regulating elements are present.
Innovation Solution
Incorporating a quantity regulator element in the fluid channel's insert section, located upstream of the upper reversal point, which automatically regulates the fluid flow to prevent pressure buildup and ensure consistent dispensing, thereby eliminating the need for dynamic pressure reduction and subsequent air bubble compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a flow-regulating element is located at the fluid outlet to minimize fluid flow rates, then water saving is improved, but prolonged dripping occurs after shut-off due to air bubble compression and back pressure
Solution Approach 1:
The flow control element is positioned upstream of the upper reversal point in the concavely curved section, performing flow regulation before the fluid enters the curved portion. This preliminary action prevents air bubble compression and back pressure buildup downstream, eliminating prolonged dripping while maintaining water conservation benefits
Solution Approach 2:
The flow control element acts as an intermediary component between the fluid supply and the concavely curved outlet pipe section. By regulating flow at this intermediate position, it prevents the transmission of back pressure and air bubble compression effects to the downstream curved section, resolving the contradiction between water saving and shut-off performance
2Adaptability or versatility
If the outlet pipe has a U-shaped concave bend section, then installation flexibility is improved, but air bubbles accumulate in the bend section causing prolonged residual flow
Solution Approach 1:
The flow control element is installed upstream of the upper reversal point of the concave bend, performing flow regulation before fluid enters the problematic curved section. This preliminary action prevents air bubbles from being compressed and trapped in the bend, eliminating prolonged residual flow while preserving the installation flexibility provided by the U-shaped design
Solution Approach 2:
The harmful effect of air bubble accumulation in the concave bend is extracted and eliminated by positioning the flow control element upstream. This removes the source of back pressure and air compression that causes prolonged dripping, while the concave bend structure itself remains intact for installation flexibility
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 effectively prevents prolonged dripping or running of residual fluid by maintaining consistent fluid flow and preventing air bubble compression, ensuring efficient shut-off without residual fluid leakage.
Implementation Method 1
a flow control element (6) arranged in an insert section (3b) of the fluid channel (3), which automatically regulates the amount of fluid that can be discharged at the fluid outlet (5)
Implementation Method 2
the fluid pressure in the fluid channel decreases, causing the compressed air cushion in the curved section of the fluid channel to expand again
Data Source
Figure 1~3
Figure 4~5
AI summary
1. Sanitary outlet fitting with outlet pipe. 2.1. The invention relates to a sanitary outlet fitting with an outlet pipe (1) and with a fluid channel in the outlet pipe, which extends from a fluid inlet (30) into the outlet pipe to a fluid outlet (5) from the outlet pipe. 2.2. The outlet fitting according to the invention has a flow control element (6) arranged in an insert section (3b) of the fluid channel (3), which automatically regulates the amount of fluid that can be discharged at a fluid outlet (5) of the fluid channel. The insert section is located in the region of the fluid inlet (30), and/or the outlet pipe (1) has a U-shaped pipe bend section (2) that is concavely curved in the operating position. The fluid channel (3) runs in the region of the pipe bend section, forming an upper reversal point (PU) in the operating position, and the insert section is located upstream of the upper reversal point. 2.3. Use e.g.for water-bearing outlet fittings on washbasins and kitchen sinks.