EAST Bh-Xw Variable Frequency Water Supply Equipment

Product Overview                        

• The BH variable - frequency water supply equipment consists of an AC variable - frequency speed regulator, an industrial - grade programmable logic controller, a digital PID regulator, low - voltage electrical appliances, a pressure sensor, a liquid - level controller, and a motor - pump unit to form a closed - loop variable - frequency speed - regulating water supply control system. This system can automatically adjust the rotational speed of the water - pump motors within the unit and the number of pumps put into or taken out of operation according to the instantaneous pressure changes in the pipe network, meeting the needs of users for constant - pressure variable - flow water supply and variable - pressure variable - flow water supply. It keeps the pressure at the end of the water supply network constant, ensuring that the entire water supply system remains in an optimal state of high - efficiency energy - saving.
• The standard pump used in the BH variable - frequency water supply equipment is a stainless - steel vertical multi - stage stamping pump. This series of pumps features an advanced hydraulic model and high - efficiency energy - saving performance. The impellers inside the pump are formed by stamping stainless - steel, with smooth flow channels, avoiding secondary pollution. The pumps operate stably with low noise, and the overall unit is reliable in quality, aesthetically pleasing in appearance, small in size, light in weight, and the motors have a long service life.
• The BH - X series variable - frequency water supply equipment (with a water tank) has the same functions as the BH variable - frequency water supply equipment. On this basis, our company can configure stainless - steel water tanks of appropriate sizes according to different working conditions to meet the requirements of various working conditions.

Working Environment                      

• Power supply: 380V×(100±10%), three - phase five - wire system, with a frequency of 50Hz.
• Ambient temperature: 0°C to 45°C (Appropriate measures must be taken if it exceeds this range).
• Installation location: A place free of conductive dust, gases that can corrode metals and damage insulation, and explosion - free.
• Altitude: Not exceeding 1000m. When it exceeds, the control components and motors should be adjusted accordingly.

Scope of Application                    

• Domestic water for high - rise buildings, urban and rural residential communities, enterprises, and institutions.
• Various industrial water (such as cooling water circulation requiring constant - pressure water supply).
• Water for various waterworks, sewage treatment plants, farms, irrigation stations, and sprinkler irrigation stations.
• Environmental protection water treatment, leachate analysis systems, industrial pickling lines, and industrial plant cleaning.
• Oilfield oil transportation pipelines, oil depots, and crude oil processing systems.
• Renovation and upgrading of existing water supply systems (including air pressure tanks, water towers, and elevated water tanks).
• Pressure - making and water - supplementing systems for industrial boilers and hot water supply systems.

Equipment Features                     

• Simple structure, small size, less floor space, low investment, quick installation, and easy for centralized management.
• Reasonable design, easy operation, reliable performance, and fully automatic operation without the need for on - site operators.
• Equipped with various fault display and inspection records, as well as comprehensive protection functions such as over - voltage, over - current, overload, short - circuit, phase - loss, and water - source water shortage automatic shutdown, making it easy to use, maintain, and troubleshoot.
• With automatic variable - pressure control, it can adjust the water output according to the actual water consumption of users, ensuring it always operates at a high - efficiency state. Using multiple small - power pumps in combination instead of a large - power pump is more suitable for the situation of "large - flow at peak and small - flow at off - peak" in users' water use, achieving significant energy - saving results. Compared with traditional water supply, it eliminates the non - working losses of starting and stopping, with an energy - saving rate of 20% - 50%.
• The frequency converter or soft - starter realizes soft start and stop of the water pump, protecting the power grid and water pipe network from impact; it can significantly reduce operation noise and greatly extend the service life of related equipment.
• Multiple pumps can operate in various circulation modes, which can fully utilize the running time of pumps and avoid corrosion and rust caused by the water quality due to the long - term idleness of a certain pump.
• With a wide range of product specifications and customizable configurations to meet different application scenarios.
• The control is programmable, allowing for multiple control methods according to user needs. For example, time - controlled switching, fire - fighting linkage, small - flow and zero - flow automatic sleep, and centralized management by a host computer.
• The water supply pressure of the equipment can be adjusted as needed to meet the water pressure requirements of the top floors of high - rise buildings during peak water consumption.

Equipment Working Principle                       

• The system continuously samples the water pressure of users through the pressure sensor on the water pipe network and converts the pressure signal into an electrical signal, which is transmitted to the PID regulator. Then, it compares and calculates the electrical signal with the set pressure value by the user. The results of the comparison and calculation are converted into a frequency adjustment signal and a water - pump start/stop signal, which are sent to the frequency converter and the programmable logic controller (PLC) respectively. The frequency converter adjusts the rotational speed of the water - pump motor by changing the power frequency, while the programmable logic controller controls the start/stop of the water pump according to the water - pump start/stop signal transmitted by the PID regulator. Through the start/stop of the water pumps and the adjustment of their rotational speeds, the water pressure in the user's pipe network is stabilized at the pressure value set by the user, making the water output of the water supply equipment "increase" in line with the constantly changing water consumption of the user's pipe network, achieving the goal of "variable - flow constant - pressure water supply".

Technical Performance of Standard Products

Note:

• The number of applicable households in the following performance parameter table is calculated with reference to Technical Measures for Design of Civil Building Engineering - Water Supply and Drainage. Among them, the number of water - using people per household m=3.5; the hourly variation coefficient Kh=2.5; the daily water consumption per person is 200L/(person·d); corresponding to the setting standard of sanitary appliances for Class - II ordinary residential buildings, the water supply equivalent number Ng of sanitary appliances set in each household is 4; the water - using hours T=24h. And the calculated value is only for residential water use, excluding facilities such as cultural and educational, catering, entertainment, shops, medical and health care, and community management supporting the residential area, as well as water for greening, landscape, road and square sprinkling, and public facilities.
• The performance parameter table of the BH - X series variable - frequency water supply equipment (with water tank) is consistent with the BH parameter table. The effective volume of the domestic water tank in the residential area should be determined according to the domestic water regulation volume and the safe water storage volume. The domestic water regulation volume should be determined by calculating according to the change curves of the inflow and outflow. When there is insufficient data, it can be determined as 15% - 20% of the maximum daily water consumption. When approved by relevant departments, if the water tank also undertakes fire - fighting functions, fire - fighting water should be stored, and the requirements for fire - fighting water storage should comply with the current national fire - protection codes.