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設計原理 Design process
The drainage system of most apartments in Hong Kong is shown in figure A. Odour or vapour with virus may enter the apartment through the drain pipes. Especially when the ventilation fan is on and the windows are shutted. Air has no other ways but comes in through the drain pipes from other apartments. In such a way, odour or virus can spread through the whole building. SARS disease outbreak in the city was a typical example.
Most of the drain gates in HK are in either 3” square vertical or 3” round horizontal format. Mostly they are made of metal but some are of plastics. As a matter of fact, sewage odor or cockroaches often come into the apartments through these drain gates since there is no water in the u-traps outside the building. The protective mechanism offered by these u-traps is no longer valid because the lifestyle of most HK people has been changed. Seldom people will pour a bucket of water onto the floor for cleaning but just mopping the floor instead. Thus there will be no water in the u-trap to block foreign substance from coming into the apartment. That is why a device is needed to be designed to compensate the function of the u-trap.
What is in mind that a device can have a one-way pass through function? Correct! It is valve mechanism. Thus this mechanism should be employed in the new design. Upon many brainstorming and testing models, a preliminary functional device was built. It had to be tested thoroughly for its function, reliability and durability by many experiences, such as one experiment shown in figure C.
The design was eventually finalized upon some further revisions and improvements. The esthetics of course could not be ignored since such new design was created by an industrial designer. Ultimately the new product was patented for it unique mechanism and design before launching to the market.