Double suction multistage horizontal split pump

Abstract

The invention relates to a double suction multistage horizontal split pump. The double suction multistage horizontal split pump mainly comprises a pump cover, a pump base and a pump shaft. The pump cover and the pump base are spliced up and down to form a pump shell pumping chamber. The pump shaft is provided with a primary impeller and more than one pairs of back-to-back secondary impellers from left to right. The primary impeller is communicated with a primary water suction chamber and a primary pumping chamber on a volute. The primary water suction chamber is communicated with an inlet. The secondary impellers are communicated with corresponding water suction chambers and pumping chambers. The pumping chamber communicated by the secondary impellers reversely arranged is communicated with an outlet. The double suction multistage horizontal split pump provided by the invention has the beneficial effects that the pump base provided by the invention is only provided with one inlet, the pipeline is convenient to install, and the primary impeller is a double suction impeller so that the suction performance of the pump is further enhanced; the secondary impellers are installed in a back-to-back way, so that the axial force is balanced; the pump has such a structure that the outlet is arranged in the middle of the pump so that the pressure of a sealed chamber is approximate to that of the inlet, therefore, the PV (Pressure of sealed fluid*average sliding Velocity at sealed end) value of mechanical seal is effectively reduced.

Description

technical field [0001] The invention relates to a split pump, in particular to a double-suction multi-stage horizontal split pump. Background technique [0002] The existing double-suction split pumps have the schemes disclosed in patents 200820185699.3 and 200920063893.9. There are two primary impellers symmetrically distributed on both sides of the secondary impeller back to back. The secondary impeller is a double-suction impeller. The pump base has two inlets and one outlet. This solution needs to install two inlet pipelines, the same performance head requires more impeller stages, and the volute is relatively longer and heavier, because the two first-stage impellers and the secondary double-suction impeller are actually only equivalent to two-stage impeller boosters. Pressure, when four-stage impellers are required to boost pressure, two pairs of first-stage impellers need to be added, and the length of the volute needs to be doubled, which increases manufacturing diffi...

AI Technical Summary

Problems solved by technology

This solution needs to install two inlet pipelines, the same performance head requires more impeller stages, and the volute is relatively longer and heavier, because the two first-stage impellers and the secondary double-suction impeller are actually only equivalent to two-stage impeller boosters. When four-stage impellers are required to boost pressure, two pairs of first-stage impellers need to be added, and the length of the volute needs to be doubled, which increases manufacturing difficulties, makes the pump more cumbersome, and makes installation and maintenance more difficult.

[0003] Most of the existing centrifugal pumps use a single volute. If such a structure is used at a non-design point, it will generate a certain radial force. The more the deviation from the design point, the greater the radial force. The more unfavorable the stability of the whole machine operation

[0004] However, the current level of split pumps in China still use packing seals, not only the leakage is unavoidable, but more importantly, the power loss is relatively large.

Although there are also mechanical seals, they are all bulk structures, which are very inconvenient to install and replace.

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