The difference between a small submersible pump and a self-priming pump
2022-08-31
Many people unfamiliar with water pumps may only know about small submersible pumps, as they are commonly used in daily life, such as in hardware stores, agricultural irrigation, and fish farming. In reality, there are many types of water pumps, and their applications are quite extensive. Almost anywhere liquid needs to flow, small submersible pumps are used. Water pumps have an output second only to electric motors.
Before differentiating between small submersible pumps and self-priming pumps, you need to understand the difference between self-priming pumps and submersible pumps.
I. Advantages and Disadvantages of Small Submersible Pumps
Small submersible pumps are an extension of other pump products. Early water pumps were submersible pumps. As the name suggests, a small submersible pump is a pump that operates underwater. The advantage of a submersible pump is that it does not require a separate pump room. It can be put into use, and because it is directly immersed in water, its water suction capacity is particularly strong, so we use a permanent magnet high-speed motor to increase its speed, achieving high flow rate and light weight. High-flow portable submersible pump products, such as those with a flow rate of 400m3/h, a head of 8-10 meters, a motor power of 15-22KW, and a weight of only about 37kg. Submersible pumps require a crane for movement, while this small submersible pump can be easily handled by one person. It is small, lightweight, and uses an inverter for safer and more reliable operation.
Regardless of any product's demand, it has its shortcomings, and the disadvantage of a submersible pump is that it is inconvenient to observe its operating status when immersed in water, and maintenance is also inconvenient. Frequently pulling the cable can easily break the cable, causing the submersible pump to enter the water.
II. Advantages and Disadvantages of Self-Priming Pumps
Self-priming pumps were developed to address the inconvenience of observing and maintaining submersible pumps submerged in water. The advantage of a self-priming pump is that only the flow components inside the pump body contact the liquid; if the seal is damaged, the liquid cannot contact the motor, thus avoiding the defect of water ingress leading to motor burnout.
If a vacuum-assisted self-priming pump is used, its self-priming distance can also be used in situations far from the self-priming pump. For example, in flood control and rescue operations, where the self-priming pump cannot reach, the self-priming pump pipeline can be connected to a distant location. Rainwater can be drawn from a distance of 300 meters (the actual pumping distance needs to be calculated based on the size and flow rate of different pipes).
The disadvantage of a self-priming pump is that its self-priming height is limited to within 9 meters. If the height is exceeded, only a small submersible pump can be used. Therefore, whether a submersible pump or a self-priming pump is better should be determined according to the working conditions. For conditions within the suction range, we recommend using a small submersible pump. If there is no power source for a self-priming pump, it can also be made into a diesel engine-driven pump product.
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