Multistage Pump

Abstract

The invention provides a multi-stage pump, which can be used to reduce housings of middle segments, and then reduce the production cost. Penetrating bolts used for fixedly connecting the housings of the middle segments are not required, and the housings of the middle segments can be easily disassembled. The multi-stage pump comprises a multi-stage impeller (2); housings of the multi-stage middle segments (3A-3D) used for accommodating of the multi-stage impeller (2); a casing of the housings of the middle segments used for accommodating the housings of the multi-stage middle segments (3A-3D); an outer housing (8) used for encircling the housings of the multi-stage middle segments (3A-3D) and the casing (20) of housings of the multi-stage middle segments; and fixing mechanisms (23,31) used for fixing the casing (20) on the multi-stage middle segments (3A-3D).

Description

technical field [0001] The present invention relates to a multistage pump for transferring liquid, and more particularly to a high-pressure multistage pump capable of transferring liquid at high pressure. Background technique [0002] A high-pressure multistage pump exists as a pump capable of transferring a liquid at a high pressure of several MPa to several tens of MPa. High-pressure multistage pumps are used for various purposes, for example, to transfer hazardous liquids at high pressure. In such a pump, in order to withstand the high pressure of the liquid and prevent the liquid from leaking to the outside, a double-layer casing structure is adopted in which a casing is further provided outside the casing. [0003] figure 1 It is a cross-sectional view showing a conventional high-pressure multistage pump. Such as figure 1 As shown, a high-pressure multistage pump has a plurality of impellers 2 fixed on a shaft 1 . A plurality of intermediate casings 3 are arranged ...

AI Technical Summary

Problems solved by technology

[0009] However, for shrink fitting, a furnace for performing shrink fitting is required, and it takes cost and time to heat the middle casing

Therefore, the manufacturing cost of the pump as a whole increases

Also, in order to remove the midsection casing in the event of a pump failure, burners such as burners must be used

Depending on the installation site of the pump, there are cases where the use of fire is not allowed (for example, a chemical plant, etc.), and the burner cannot be used in such an installation site

Therefore, a failed pump cannot be repaired on site in this setting, and the pump must be transported to the factory

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