A fixture for a sink
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Solution Overview
Problem
Conventional metal fixtures for sinks, typically cast from brass, incur high capital costs, making them expensive to produce even at low volumes, and existing hand-drying solutions do not effectively manage pressure losses for efficient air drying.
Innovation Solution
A fixture comprising two straight, hollow metal tubes with a curved elbow duct and foam or plastic inserts for guiding drying air, connected to a motor-driven fan unit, allowing cost-effective production and minimizing pressure losses for efficient air drying, while optionally providing a separate water nozzle for dual functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional metal fixtures are cast from brass, then the fixture has high strength and durability, but the capital costs are very high
Solution Approach 1:
The fixture is divided into multiple straight metal tube segments that are joined together to form the required configuration. This segmentation allows each segment to be manufactured separately using cost-effective methods rather than requiring expensive casting of complex curved shapes, while maintaining structural strength through proper joining of segments
Solution Approach 2:
Inserts are introduced as intermediary elements inside the metal tubes to create the required curved airflow path. These inserts act as mediators that enable the tubes to function as curved ducts without requiring the tubes themselves to be curved, thus allowing use of simple straight tube manufacturing methods while achieving the functional equivalent of curved passages
2Ease of operation
If curved ducts are used to guide drying air, then the airflow path is smooth, but pressure losses increase
Solution Approach 1:
Curved inserts are placed inside straight metal tubes to create smooth curved airflow paths. The curvature of these inserts is designed to match the required airflow direction changes while maintaining smooth surfaces that minimize turbulence and pressure losses, achieving the benefits of curved duct geometry without the manufacturing complexity
Solution Approach 2:
The inserts are positioned locally at specific positions within the straight tubes where direction changes are required. This local modification approach allows the majority of the tube length to remain straight and simple, while only introducing curvature where necessary for airflow guidance, thus minimizing overall pressure losses
3Temperature
If foam inserts are used to define curved elbow duct, then heat insulation and noise absorption are provided, but the device complexity increases
Solution Approach 1:
The fixture combines metal tubes with foam inserts to create a composite structure. The metal tubes provide structural strength and durability, while the foam inserts provide heat insulation and noise absorption. This composite approach allows multiple functions to be achieved using relatively simple components that can be easily assembled
Solution Approach 2:
Multiple functions are merged into the foam inserts: they simultaneously define the curved elbow duct geometry for airflow guidance, provide heat insulation to prevent condensation, and absorb noise from the motor-driven fan unit. This merging of functions into a single component reduces overall device complexity compared to using separate elements for each function
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 cost-effective production of hand-drying fixtures with reduced pressure losses, maintaining high exit airspeeds for effective drying and offering heat insulation and noise absorption, while allowing for optional water delivery through a compact design.
Implementation Method 1
The use of a foam material has the additional advantage that it provides a degree of heat insulation
Implementation Method 2
The use of a foam material has the additional advantage that it provides a degree of heat insulation and noise absorption
Data Source
Figure 1
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AI summary
The invention relates to a fixture for delivering a first fluid over the basin of a sink. The fixture comprises a supply inlet for the fluid and a delivery outlet for the fluid, the inlet being connected to the outlet through a hollow body of the fixture, the hollow body comprising two straight, hollow metal tubes: a first tube arranged to be mounted next to the basin of the sink in use, and a second tube joined to the wall of the first tube so as to project out over the basin of the sink in use. One or more inserts are provided inside the first metal tube, which inserts together define a curved elbow duct inside the first metal tube for guiding the fluid from the first metal tube into the second metal tube. The tubes can be cut at relatively low cost from conventional rolled steel tubing. At the same time, the curved elbow duct limits pressure losses inside the first tube.