Principle of Mobile Toilet Flush Tank

The core principle of a mobile toilet flush tank is based on the working modes of elevated water tanks or sensor-based water tanks, triggering flushing through infrared sensing, cumulative counting, or mechanical linkage, with some designs incorporating a float system for automatic water replenishment.

1. Infrared Sensing-Triggered Flushing

When the flush tank employs infrared sensing technology, its working principle is similar to that of common sensor-based flushing devices in public restrooms. An infrared probe is installed on the top or side of the tank. When a person approaches within a certain distance (usually 0.5-1 meter), the probe detects the human infrared signal and triggers the internal solenoid valve to open. At this point, the water in the tank quickly rushes down under the action of gravity or elevated pressure, completing the toilet flushing action. If the tank is designed as an elevated structure, the water will generate pressure due to the height difference and directly flush into the toilet bowl; if the siphon principle is used, negative pressure will be pre-formed in the tank, and the siphon effect will accelerate the water flow during flushing. This mode is suitable for immediate flushing after single use to avoid odor retention.

2. Cumulative Counting-Triggered Flushing

Some mobile toilet flush tanks adopt a cumulative counting mode, recording the number of users through a built-in counter. For example, it can be set to automatically flush once every 10 users. When the count reaches the threshold, the system activates the solenoid valve or mechanical drainage device to complete the flushing. This design is suitable for scenarios with a large flow of people, reducing water waste caused by frequent flushing and avoiding accidental triggering when no one is using it. The counter usually detects each use through sensors (such as infrared or pressure sensors) and accumulates the data. After reaching the set value, it resets and initiates flushing.

3. Seesaw System and Float-Linked Water Replenishment

Some mobile toilet flush tanks use a mechanical seesaw structure combined with a float for automatic water replenishment. When the tank drains water, one end of the seesaw sinks,联动 (this Chinese word means 'linking' or 'interacting', here it describes the action of the seesaw triggering the drainage valve to open, so we can translate it as 'triggering') the drainage valve to open; after drainage is complete, the other end of the seesaw rises due to the float descending with the water level, closing the drainage valve and opening the water inlet valve to start water replenishment. When the float rises to the set height with the water level, the water inlet valve closes, completing the water replenishment cycle. This design does not require electricity and is suitable for scenarios without a power supply or where energy conservation is required. However, it relies on the stability of the mechanical structure and requires regular maintenance to prevent jamming.

4. Common Types and Applications of Sensor-Based Water Tanks

Sensor-based water tanks, as non-contact devices, are commonly found in squat toilets or trough-type toilets in public restrooms. Types include concealed (hidden behind the wall or toilet bowl) and wall-mounted (hung on the wall). Their core advantage lies in hygiene, avoiding direct contact between users and the flush button, reducing the risk of cross-infection. Some high-end models also have water-saving functions, controlling the amount of water flushed per time by adjusting the opening time of the solenoid valve or the water flow rate.