Model Meaning

Product Introduction
The QHYB-LG automatic variable frequency water supply equipment (equipped with LG detachable high-rise building multi-stage pump) is a new type of tower free water supply equipment, consisting of three main parts: water pump unit control equipment and boosting and stabilizing equipment. The water supply capacity is determined by the pump unit, and the coordinated operation of the system is controlled by the control system. The main function of the boosting and stabilizing equipment is to store energy and maintain pressure, cope with small amounts of water supply and normal pipeline leaks, and is also an indispensable part of implementing automatic control. When a large amount of water is used, the pressure in the pipeline decreases and the water pump automatically starts to supply water.
QHYB-LG automatic variable frequency water supply equipment (equipped with LG detachable high-rise building multi-stage pump) can be divided into pneumatic water supply equipment and variable frequency water supply equipment according to different working modes, each with its own characteristics. Widely used in various fields such as daily life, fire protection, production, and sprinkler systems.
The water pump is the foundation of the water supply equipment and the fundamental guarantee for the water supply equipment to demonstrate its water supply capacity. The water pump that matches the water supply equipment is universal and can be suitable for various flow rates and lifting programs. According to the needs of flow rate and lifting program, the product can have 1-4 or more water pumps running in parallel. The water pump unit is connected to another set of boosting and stabilizing power supply pressure equipment (water flow pump unit) to switch operation with the main pump in a small flow range, providing efficiency and further reducing energy.
According to the different working modes of the equipment, it can be divided into living type, fire-fighting type, sprinkler type, and shared models for living and fire-fighting.

Selection criteria
The basic basis for selecting a complete set of automatic water supply equipment is the designed water supply flow rate and water supply pressure (water head), and also needs to consider the type of flow variation for the purpose.
Continuous type: There are rarely times in a day when the flow is zero, or when the normal leakage of the pipeline network maintains a certain flow, such as in the pressurization system of large hotels, restaurants, industrial and mining enterprises.
Intermittent type: Long periods of low water usage and low or zero flow, such as small office buildings, commercial and residential buildings, various residential buildings, and production water use
At the same time, various factors such as changes in flow rate during a certain period of water supply, changes in flow rate in different seasons, and differences in water use in different regions should also be considered.
The complete set of fire sprinkler water supply equipment should generally choose the pneumatic water supply equipment, as it is in a long-term system pressure holding state without any changes in flow rate. The pneumatic water supply equipment can cope with general pipe leaks and add a small flow auxiliary pump, so there is no need to start the main pump normally, saving energy.
Advantages of variable frequency water supply equipment: It can provide constant pressure water supply and the constant pressure value can be adjusted within a certain range. The constant pressure accuracy is generally less than 0.02MPa. Variable frequency speed regulation is an efficient, energy-saving and consumption reducing method. Compared with typical pneumatic water supply equipment, it saves an average of 20% energy. In addition, the impact current of variable frequency starting is small and the pump's impact is also small, resulting in low noise during low-speed operation.
The advantages of pneumatic water supply equipment include relatively low cost, simple control system technology, convenient service, and easy maintenance.

Selection Guide
1、 Selection of pumps for variable frequency constant pressure water supply equipment

performance parameter