Working principle of booster pump

Update: 17-07-2020

Automatic booster pump, as the name implies, is an auto […]

Automatic booster pump, as the name implies, is an automatic supercharging equipment that can automatically start and stop or speed regulation according to your water consumption situation without human attendance. To put it simply: turn on the tap water pump to start running, and reduce water consumption or turn off the tap water pump automatically stop working equipment is the automatic booster pump.

Classification and working principle
According to the different control modes, the full-automatic booster pump can be divided into four types: water flow type, pressure difference type, frequency conversion type and liquid level type. The working principle and basic characteristics are introduced in the following categories.
Water flow type: water flow type automatic booster pump is an automatic booster pump with relatively simple structure. Through the water flow switch, it is convenient and accurate to sense when the user uses water and when he or she does not need water. When using water, the water flow impulse the water flow switch, so that the booster pump can be powered on; otherwise, the water flow switch will be restored to its original position after the water is not used, and the booster pump will be powered off and shut down. In this way, the reciprocating cycle realizes automatic operation. Generally, the water flow booster pump is a small automatic booster pump, which is widely used for water heater pressurization. There are also some occasions with large water consumption, such as industrial or cooling water circulation.

Differential pressure type: the so-called pressure difference is based on the pressure difference. A differential pressure control switch can easily customize the starting pressure value and shutdown pressure value. When the pressure is equal to the set start-up pressure value, the control system will make the water pump power on, otherwise, when the pressure rises to the set stop pressure value, the water pump will be cut off by the control system and stop running. From the working principle, it is not difficult for us to understand that the booster pump will not start when the high pressure shutdown value and low pressure start value of the pipe network pressure balance. Based on this phenomenon, the pressure difference type automatic booster pump will have the typical disadvantage of unstable pressure, which is not suitable for the occasions where the pressure needs to be very stable, otherwise, the water pressure may be large and small, or the machine may start and stop frequently, which may cause serious impact on the use. But the differential pressure type automatic booster pump is not worthless, such as the field of fire protection or once it is started for a long time, it is also suitable for differential pressure control. After all, the overall price is lower than that of frequency control.
Liquid level type: the liquid level control is based on the water level difference. In a simple way, it is to stop the machine at high water level to prevent water overflow, and to start at low water level to make up water for the pool. The height of the liquid level is achieved by controlling the distance between the balance weight of the liquid level switch and the floating ball of the switch. The greater the distance is, the greater the water level difference will be. There are essential differences between liquid level type automatic booster pump and timing and differential pressure as well as the variable frequency automatic booster pump mentioned below. It has its unique features and is irreplaceable for timing, differential pressure and frequency conversion automatic booster pump. It is generally used for drainage, water replenishment of high and low water pools, etc.

Frequency conversion type: as the name implies, it is a fully automatic booster pump driven by frequency converter. Variable frequency full-automatic booster pump is developed in recent years. It is also based on a fixed value. Once the control system finds that the actual pressure deviates from the set pressure value, the system will immediately control the supplementary pressure of the water pump. The speed of the pump operation is related to the water consumption speed. The greater the change of water pressure, the larger the surface water consumption. The system will control the rapid operation of the pump to achieve the purpose of pressure supplement; When the pressure value of the pipe network approaches the set pressure value, the system starts to control the pump to slow down. The speed of deceleration is also related to the speed of water consumption. At this time, the smaller the water consumption, the slower the water pump will run. When no water is finally used, the system will control dormancy and the pump will stop running. Reciprocating circulation, then realize the constant pressure water supply of frequency conversion automatic booster pump.

Main uses
The automatic booster pump is needed whenever the secondary pressurization is needed and the water pump is not started or stopped manually. If you need constant pressure water supply, please choose frequency conversion type; if you don't require high pressure stability or operate for a long time once starting up, choose pressure difference type; if upper and lower pools or both are water tanks, choose liquid level type. But in some cases, not as long as can automatically start and stop the automatic booster pump can be competent. For example, in some occasions, the water consumption is relatively large or the water consumption is relatively frequent. If the pressure difference control is adopted, frequent start-up and stop, easy burning of motor or contact, unstable water pressure and so on will occur. In this situation, you need to choose frequency conversion automatic booster pump to solve the problem.

Ningbo Sanxin Pump Co., Ltd.