Elastic Grommet Hose Coupling for High-Pressure Appliance Sealing
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Solution Overview
Problem
Existing coupling arrangements for household appliances require injection molding of grommets and clamping for sealing, which are inefficient and not suitable for high-pressure applications.
Innovation Solution
A coupling arrangement featuring an elastic grommet with shoulders that elastically engages with a connecting piece and a corrugated hose, eliminating the need for injection molding and clamping, allowing for a reliable high-pressure seal by using a stiff material for the hose and a rigid material for the connecting piece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If injection molding of grommet and clamping are used, then sealing connection is achieved, but manufacturing complexity and time are increased
Solution Approach 1:
The patent extracts the sealing function from the complex injection molding and clamping process, concentrating it into a simple elastic grommet with gripping shoulders that provides sealing through elastic deformation alone, eliminating the need for additional molding and clamping operations
Solution Approach 2:
The patent changes the physical state of the grommet from rigid to elastic, allowing it to deform and grip the connecting piece and corrugated hose through elastic forces, thereby achieving sealing without complex mechanical fastening or injection molding processes
2Ease of manufacture
If elastic grommet is used for connection, then manufacturing is simplified, but pressure resistance is reduced
Solution Approach 1:
The patent employs curved gripping shoulders on the elastic grommet that engage with the connecting piece and corrugated hose, creating a mechanical interlock through geometric curvature that significantly increases withdrawal pressure resistance while maintaining simple elastic engagement
Solution Approach 2:
The patent creates a composite connection system combining the elastic grommet material with the rigid connecting piece and corrugated hose, where the elastic component provides simple engagement while the rigid components and geometric shoulders provide pressure resistance
3Strength
If stiff material is used for hose and rigid material for connecting piece, then structural strength is improved, but flexibility during assembly is reduced
Solution Approach 1:
The patent introduces the elastic grommet as an intermediary component between the stiff corrugated hose and rigid connecting piece, allowing the grommet to deform and accommodate alignment variations during assembly while the hose and connecting piece maintain their structural strength
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 provides a reliable sealing connection that can withstand pressures greater than 5 bar, with the elastic grommet ensuring a secure fit without the need for clamping, enabling the use of stiff hose and rigid connecting piece materials.
Implementation Method 1
an elastic grommet pushed onto the connecting piece in a mounting direction, the grommet having a first shoulder on the inside that engages behind the shoulder of the connecting piece and a second shoulder on the outside
Data Source
Figure 1
Figure 2
AI summary
The present invention creates a coupling arrangement (36) for a household appliance (2), with: a connecting piece (16), which has a channel (5) on the inside for transporting a fluid and on the outside has a shoulder (18), one on the connecting piece (16 ) elastic grommet (19) pushed on in a mounting direction (M), the grommet (19) having a first shoulder (21) engaging behind the shoulder (18) of the connecting piece (16) on the inside and a second shoulder (22) on the outside, and a corrugated hose (26), which has a shoulder (35) on the inside of one end section (28) thereof, which engages behind the second shoulder (22) of the spout (19).