Screening pump classification features

Depending on the requirements of the temperature, pressure, presence or absence of particles, and viscosity of the liquid being transported, canned pumps can be divided into the following types:

First, the basic type (standard type)

The temperature of the conveying medium does not exceed 120°C, and the lift does not exceed 100m. Various other types of canned pumps are variations and improvements on the basis of basic types.

Second, reverse cycle type This type of canned pump, the bearing lubrication, cooling and motor cooling liquid flow direction and the basic type is exactly the opposite.

The main feature of the reverse circulation pump is that it is not easy to generate cavitation, suitable for the delivery of easily vaporized liquids, and is sometimes referred to as an easily vaporized type.

Third, the high-temperature transmission medium temperature up to 450 °C. The cooling water jacket is usually added outside the shielded motor and the cooling jacket is added to the external circulation tube to cool the high-temperature circulating fluid to reduce the temperature of the motor and the bearing. In the case of low power, some manufacturers do not use coolant, but set the fins on the outside of the motor and use special windings to adapt to the working conditions. Its use temperature cannot generally exceed 400°C.

Fourth, the high melting point type has a jacket on both the hydraulic end and the motor side of the pump. The jacket can be ventilated with steam or liquid at a certain temperature to prevent the high-melting point liquid from crystallizing. The external circulation tube of the pump should also be heated (heated) jacket.

Fifth, the shell of the high-pressure shield pump is a high-pressure vessel, so that the pump can withstand high system pressure. In order to support the shield sleeve at an internal high pressure, it can be used by the stator coil itself to withstand the pressure. It can also be used as a shield pump that operates at high temperatures and pressures.

6. The suction inlet of the self-priming pump is much higher than the impeller center. After the pump is stopped, when there is no liquid in the suction pipeline, the impeller and the enlarged pump chamber are always filled with liquid, and the pump can be started without starting the pump. jobs. Self-priming pumps are particularly suitable for extracting liquids from underground containers.

In addition, according to different methods can also be divided into liquid type, mud type, high-pressure pipeline type and for the various types of ships, nuclear power plants and absorption refrigeration equipment for the use of shielding pumps. Can also be divided into vertical, horizontal, online and single-level, multi-level and other different types.