Working principle of negative pressure water supply equipment

The steady-flow tank-type negative pressure-free water supply equipment is directly connected to the municipal pipe network and provides water supply by series superposition based on the remaining pressure of the municipal pipe network.

(1) Variable frequency constant pressure water supply: When the water supply of the municipal pipeline is greater than the water consumption of the user, the constant pressure water supply equipment of the constant flow tank type variable frequency constant pressure water supply is used. At this time, a certain amount of pressurized water is stored in the constant flow tank.

(2) Eliminating negative pressure: When the user's water consumption increases, causing a pressure drop at the connection between the municipal pipe network and the stabilizing tank, a negative pressure is formed in the stabilizing tank when the pressure drops below the relative pressure of 0. The air inlet valve of the vacuum suppressor opens, and atmospheric air enters the stabilizing tank. At this time, the stabilizing tank is equivalent to an open water tank with a free liquid surface, and the pressure is the same as that of the atmosphere, thus eliminating the negative pressure. When the water level drops to the set value, the level controller transmits the control signal to the control system in the frequency converter control cabinet, controlling the booster unit to stop working and the user's water supply to be cut off. When the user's water consumption decreases, the water level in the stabilizing tank rises, and the gas is discharged from the exhaust valve of the vacuum suppressor. After the pressure returns to normal, the booster unit automatically restarts and the water supply is restored.

(3) Water outage shutdown function: When the municipal water supply is interrupted, the booster unit will automatically stop running under the control of the liquid level controller. After the municipal water supply is restored, it will automatically start to restore normal water supply.

(4) Low flow sleep function: When the user does not use water or the water consumption is very small, the equipment will automatically enter the sleep state (stop) and maintain the water supply pressure. When the user resumes water use, the system will automatically wake up and restore normal water supply.

(5) Continued water supply during power outages: When the community experiences a power outage, the municipal water supply network continues to supply water to users in the lower zones, ensuring uninterrupted water supply during power outages. Once power is restored, the equipment will automatically start and resume normal water supply.