The influencing factors of the operation of self suction centrifugal oil pump and the methods to prevent pumping

Firstly, the factors affecting the operation of self suction centrifugal pumps. The product of mechanical, volumetric, and hydraulic efficiency ultimately constitutes the efficiency of self suction centrifugal pumps. The reasons for the low efficiency of self suction centrifugal pump units are multifaceted, mainly in the following aspects:

Firstly, the efficiency of the pump itself is the fundamental factor affecting the efficiency of self suction centrifugal pumps. Even under the same working conditions, the efficiency of the pump will differ by more than 15%

Secondly, the operating condition of the self suction centrifugal pump is lower than the rated working condition of the pump, so the working efficiency of the self suction centrifugal pump is low and the energy consumption is high

Thirdly, due to the fact that the efficiency of the motor remains basically unchanged during operation, choosing a motor with a high efficiency plays a very important role in the overall efficiency of the work

The efficiency of self suction centrifugal pumps is also affected by hydraulic losses. Water loss mainly includes the loss of water friction and local resistance. After running the pump for a period of time, surface wear of components such as impellers and guide vanes will inevitably occur. As hydraulic losses continue to increase, hydraulic efficiency also decreases

The efficiency of self suction centrifugal pumps is also affected by mechanical efficiency, mainly due to the significant impact of design and manufacturing quality. When the pump is selected, the later management work has a relatively small impact on the efficiency of the self suction centrifugal pump

Six is the volume loss of the pump, also known as leakage loss. There are three main types of leakage losses in terms of volume: loss of impeller sealing ring, loss of interstage, and loss of axial force balance mechanism. Volume efficiency not only affects design and manufacturing, but also affects later management. Due to the continuous operation of the pump, the friction between the various components increases, and the gaps between the components become larger, resulting in a decrease in volumetric efficiency

The reason why the self suction centrifugal pump experiences suction and idling is due to blockage in the filter cylinder and intake in the pipeline

Eighth, before starting the pump, due to insufficient attention paid by employees to the preparation work before starting the self suction centrifugal pump, basic operations such as warm-up pump, disc pump, and filling pump were not carried out thoroughly enough, resulting in frequent pump cavitation, as well as increased pump noise and vibration. The consequences of reduced efficiency

Secondly, methods to prevent self suction centrifugal pumps from being emptied

Self suction centrifugal pumps are emptied. For friends who are not familiar with self suction centrifugal pumps, this term may seem confusing and difficult to understand. In fact, its meaning is quite simple. When a self suction centrifugal pump is used for one time, liquid should be injected into the pump body, so that the liquid to be pumped can be sucked up through negative pressure after starting. This is a normal phenomenon. Conversely, if no liquid is added, the pump will not be sucked up during idle operation, which is called emptying. This phenomenon can easily cause the motor to burn out.

Preventing a self suction centrifugal pump from being emptied is actually a very simple thing, just remember to add the liquid to it. Of course, even if the liquid is added, it may still form emptying. In this case, there is currently another method that can be well prevented. It is a specially modified self suction centrifugal pump, which includes a pump body and an impeller set inside the pump body. The pump body is equipped with an inlet and an outlet, and the inlet and outlet are respectively connected to an inlet pipe and an outlet pipe. A vacuum breaking valve is set on the inlet pipe. This form ensures that once the vacuum breaking valve of the self suction centrifugal pump stops, it will work, eliminating the vacuum at the inlet. During operation, the vacuum breaking valve will stop working, causing negative pressure to form at the inlet