Variable frequency constant pressure water supply equipment is a new type of energy-saving water supply equipment. It utilizes state-of-the-art microcomputer control technology, combining a variable frequency drive (VFD) with a motor and water pump to form a high-tech, energy-saving electromechanical integrated water supply device. The equipment uses the water pressure at the pump outlet (or the user's water flow rate) as a set parameter. Through automatic microcomputer control of the VFD's output frequency, it adjusts the pump motor speed, achieving closed-loop regulation of the user's network water pressure. This ensures the water supply system automatically maintains a stable pressure at the set value: when water consumption increases, the frequency increases, and the pump speed increases; when water consumption decreases, the frequency decreases, and the pump speed decreases. This guarantees that the entire user's network always has sufficient water pressure (consistent with the user's set pressure) and water volume (changing according to the user's water consumption).
Composition of variable frequency constant pressure water supply equipment
Variable frequency constant pressure water supply equipment mainly consists of a water pump unit, pressure measuring and stabilizing tank, pressure sensor, and variable frequency control cabinet. It can consistently maintain the pressure gauge pressure (i.e., the user's network water pressure) equal to the user's set value. It can be used for general domestic or industrial water supply. Water supply system configurations include:
1. The variable frequency water supply equipment is connected to the municipal water supply network for constant pressure water supply. When the water supply pressure is sufficient to meet the needs, all water pumps will automatically stop. Otherwise, the constant pressure water supply equipment will start to increase the pressure to meet the water demand.
2. Add a small pump or pressure tank: To completely eliminate power consumption during low-flow or zero-flow water supply, an auxiliary small pump or pressure tank can be added. When the water supply pressure is low, the main pump will automatically stop, allowing the small pump or pressure tank to run.
Features of Variable Frequency Constant Pressure Water Supply Equipment
① Variable frequency constant pressure water supply equipment with no negative pressure
The system's direct connection to the municipal water supply network and pressurized operation will not cause negative pressure in the municipal water supply network.
② Variable frequency constant pressure water supply equipment pressure setting
The permissible suction pressure of the municipal water supply network can be set by adjusting the permissible pressure control valve.
③ Variable frequency constant pressure water supply equipment uses pressure boosting (or pressure superposition).
When the permissible suction pressure and flow rate are exceeded, the pressure can be increased based on the pressure of the municipal water supply network. Compared with drawing water from a regular reservoir, this reduces the number of pumps or/and the speed, thus achieving energy savings.
④ Variable frequency constant pressure water supply equipment
The equipment detects the outlet pressure in real time through sensors, compares the detected value with the set value, and calculates to determine the number of motors and water pumps to be put into operation and the output frequency of the frequency converter (which is reflected in the speed of the motors and water pumps) in order to achieve constant pressure by following the water usage curve.
Application range of variable frequency constant pressure water supply equipment
◆Water supply for newly built residential communities, villas, office buildings, and mixed-use buildings.
◆Water supply for high-rise buildings, fire fighting, and domestic use in high-end hotels and restaurants.
◆Renovation of traditional water supply systems such as air pressure water supply and pressurized ground water tanks.
◆ Various boiler cold water supply systems and boiler hot water systems.
◆Intermediate booster pump stations in waterworks, secondary pressurization of tap water.
◆ Production and domestic water supply and pipeline pressure stabilization for various industrial and mining enterprises.
◆ Various types of circulating water and cooling water supply systems.
