Differences between external and internal water pumps for sewage lift pumps

Some of the most well-known manufacturers of sewage elevators in the world have basically entered the Chinese market, with a wide variety of products and structures. German, Italian, American, French, and local manufacturers gather in the Chinese market. So, which brand is better and which structure is more advanced for sewage elevators? Guangyi editor will continue to provide detailed explanations of various structures of sewage elevators here, for everyone to understand and learn, and to judge the advantages and disadvantages of products and choices from both structural and technical perspectives.

Structural classification of sewage elevators: Currently, all products in the world are classified according to their structure, with only two major categories.

One type is a built-in water pump structure: it means that the submersible sewage pump is installed in a water collection tank, and the start and stop of the water pump are controlled by other liquid level control methods such as floating balls. The submersible pump will be immersed in the sewage, which is dirty and troublesome to maintain. It must be installed through a buried method, and there will be a lot of sewage left in the water collection tank for a long time. This type of sewage lift structure is generally adopted by manufacturers in the United States, Italy, and France. The biggest advantage is that it has lower requirements for water pumps, lower costs, and easier manufacturing. Currently, many manufacturers in China also adopt this structure.

The second type of structure is the external structure of the water pump: it means that the submersible sewage pump is placed outside the sewage tank, and is not in contact with the sewage as a whole. Only the impeller and volute are in contact with the sewage, and the start and stop of the water pump are controlled by a pneumatic level control system. This type of sewage elevator has the advantages of flexible installation, beautiful appearance, clean and odorless appearance, and can be installed on the open surface without any obstruction to the eyes. Due to the use of an external water pump structure, the sewage in the water collection tank can be discharged to a relatively low water level every time it works. Basically, the sewage can be cleaned as soon as it arrives, which is particularly advantageous in hot summer weather. However, this structure of sewage elevator has high requirements for water pumps. In the face of frequently started water pumps and heating motors, only Germany dares to adopt an external structure and dares to use an external pump in any complex environment.