Shiyan Ventilation Mobile Toilet

The Shiyan ventilation mobile toilet primarily utilizes a negative pressure ventilation system to achieve efficient ventilation and odor removal. Its core principles and design features are as follows:

1. Working mechanism of the negative pressure ventilation system
This system installs an exhaust fan inside the toilet box to actively create an environment with lower pressure than the external atmosphere. When the exhaust fan operates, the air inside the box is accelerated out, reducing the internal air pressure and creating a negative pressure state. At this point, the odor gases inside the toilet are drawn into the exhaust path due to the pressure difference and are preferentially expelled outward rather than diffusing into the user's space. This design fundamentally reduces the retention of odors in the toilet area and improves air quality.

2. Application of Bernoulli's principle in the one-way exhaust valve
The top of the sewage storage tank is equipped with a one-way exhaust valve, whose function is based on Bernoulli's principle in fluid mechanics: when gas passes through a narrow channel, the increased flow velocity leads to a decrease in static pressure, creating directional flow. Specifically, the gas inside the sewage storage tank is expelled through the exhaust valve under negative pressure, while external air cannot flow back due to its higher static pressure. This ensures one-way gas expulsion and prevents external contaminants from entering the sewage storage tank. This design effectively prevents odor backflow and secondary pollution.

3. Auxiliary functions of the air purification device
Some models incorporate activated carbon filters or photocatalytic oxidation devices in the ventilation system to further purify the circulating air. The activated carbon filter adsorbs odor molecules through its porous structure, suitable for low-concentration gas treatment; the photocatalytic oxidation device uses ultraviolet light to activate a catalyst, decomposing organic pollutants into carbon dioxide and water, suitable for high-concentration or complex-component odor treatment. The combination of the two significantly reduces the content of harmful substances in the exhaust gas and minimizes environmental impact.

4. Summary of system advantages
The Shiyan ventilation mobile toilet achieves efficient odor control and expulsion through the synergistic action of negative pressure ventilation, one-way exhaust valves, and air purification devices. Its design balances functionality (such as preventing backflow and purifying gases) and user experience (such as reducing odor interference during toilet use), making it suitable for temporary or mobile scenarios with high hygiene requirements, such as tourist attractions and construction sites.