What is the difference between a self-priming centrifugal pump and an ordinary centrifugal pump?
There are significant differences between self-priming centrifugal pumps and ordinary centrifugal pumps in many aspects. The following is a detailed point-by-point representation and summary:
1.Self-priming ability:
The self-priming centrifugal pump has self-priming ability and can automatically absorb liquid when there is no liquid, without the need to manually fill the liquid in advance.
Ordinary centrifugal pumps do not have self-priming capabilities. They need to fill the water inlet pipe and the pump body with water at the same time every time they are started, or use an auxiliary device to evacuate the water inlet pipe.
2. Applicable scenarios:
Self-priming centrifugal pumps are suitable for scenarios that require self-priming ability when absorbing and transporting fluids, such as water treatment, air conditioning systems, pharmaceuticals, chemicals and other industries.
Ordinary centrifugal pumps are suitable for scenarios where liquids need to be transported, such as industrial production, agriculture, construction, railway stations and other fields.
3. Body structure:
Self-priming centrifugal pumps usually adopt a closed body structure with a diaphragm inside. When starting, the impeller is quickly rotated to suck in liquid under pressure.
Ordinary centrifugal pumps use an open body structure, and the inside of the body needs to be filled with liquid before it can be put into use.
4.Startup method:
When the self-priming centrifugal pump is started for the first time, a certain amount of starting circulating water needs to be injected into the pump body, but then it can automatically absorb liquid.
Every time an ordinary centrifugal pump is started, it is necessary to ensure that the water inlet pipe and the pump body are filled with water at the same time.
5. Performance characteristics:
Self-priming centrifugal pumps have the characteristics of simple structure, high reliability, wide range of uses, and easy maintenance. They can withstand high vacuum degrees and certain impurities and corrosive liquids.
Ordinary centrifugal pumps also have the characteristics of simple structure, easy maintenance, wide range of use, high efficiency and energy saving, and strong adaptability, but they do not have self-priming ability.
6. Efficiency and cavitation performance:
For pumps with the same performance parameters, self-priming centrifugal pumps are generally less efficient than centrifugal pumps and have poorer cavitation performance. This is because the self-priming centrifugal pump may have made certain compromises in efficiency while pursuing the self-priming function.
7. Installation and installation:
The self-priming centrifugal pump only has a filter at the lower end of the water inlet pipe without a bottom valve, making installation easier.
Ordinary centrifugal pumps must be equipped with a bottom valve at the lower end of the inlet pipe or an air extraction device at the outlet, and the installation is relatively complicated.
