The box-type non-negative pressure water supply equipment is the seventh generation upgraded and developed based on the original constant pressure variable-frequency water supply equipment and variable-frequency non-negative pressure water supply equipment. It consists of stainless steel water tank, dedicated water pump, intelligent variable-frequency control cabinet and non-negative pressure device, etc. The PLC controls the variable-frequency pump to run under a constant RPM and the original pressure of tap water can ensure the constant pressure needed by the user. It is characterized by energy conservation, environmental protection, low noise, constant supply pressure and other edges.
Principle of box-type non-negative pressure variable-frequency water supply equipment:
The variable-frequency pump of the box-type non-negative pressure water supply equipment runs at a certain RPM. The original pressure of tap water can realize overlay and ensure the pressure needed by the user and service of equipment at constant pressure. The water from the tap water pipeline enters the stead flow regulating tank, and the air inside the tank is automatically removed through the vacuum remover. When the water is full, the vacuum remover is automatically off. When the pressure in the tap water pipeline can meet the requirement for water use, the system directly supplies water to the pipeline through the by-pass pipe. The water pump is not working and the equipment takes full advantage of the original pressure of the tap water pipeline.
When the pressure of the tap water pipeline cannot meet the requirement for water use as the water consumption in the pipeline keeps increasing, the system pressure signal is sent back to the variable-frequency controller through the transmissible pressure gauge. The water pump starts running and auto-adjust RPM based on the water volume to supply in constant pressure. Once the water pump RPM of the tank-type non-pressure water supply equipment reaches the power frequency RPM, it will automatically start another water pump to run in variable-frequency to realize “supplementation of however much is short”.
Upon water supply, if the water pump flow is smaller than the pipeline flow, the system maintains normal water supply; at peak of water consumption, if the water pump flow is larger than the pipeline flow, normal water supply may be still enabled in a certain period by turning off the inlet valve of the steady flow tank and adjusting the water in the tank in steady flow as supplementary water source. Meanwhile, turn on the outlet valve of the tank and change it to water for tank to guarantee the municipal pipeline pressure and fresh water in the tank; after the peak, the system resumes normal water supply.
Pressure sensor, outlet butterfly valve, variable-frequency water supply control cabinet, sluice valve, check valve, flexible joint, water pump, negative pressure suppressor, ball cock, tap water inlet, stead flow regulator, solenoid valve, blow-down valve, solenoid value, water tank; the water in tank shall be automatically changed on a daily basis.