Double-suction multistage horizontal type horizontal split pump

Abstract

The invention discloses a double-suction multistage horizontal type horizontal split pump, which mainly comprises a pump cover, a pump seat and a pump shaft, wherein the pump cover and the pump seat are vertically spliced and combined into a pump case water pumping chamber, a primary impeller and more than one pair of secondary impellers in back-to-back design are arranged on the pump shaft from right to left, the primary impeller is communicated with a first-stage water suction chamber and a first-stage water pumping chamber arranged on a spiral case, the first-stage water suction chamber is communicated with an inlet, a secondary impeller is communicated with the water suction chamber and the water pumping chamber which corresponding to each other, and the water pumping chamber communicated with the secondary impeller in reverse arrangement is communicated with an outlet. The double-suction multistage horizontal type horizontal split pump has the beneficial effects that only one inlet is arranged on the pump seat, the pipeline installation is more convenient, the primary impeller is a double-stage impeller, the suction performance of the pump is further improved, the secondary impeller is in back-to-back installation, the axial force is balanced, the pump is structurally characterized in that the outlet is arranged at the middle of the pump, in addition, the high pressure at the high-pressure end is lowered through a labyrinth ring and the balance pipe, and the pressure of a sealing cavity approaches to the inlet pressure, so the PV value of the mechanical sealing 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] In the existing double-suction multi-stage split pump, the first-stage impeller is a single-suction impeller and is arranged back to back. The impeller, the pump shaft and the pump body have a long span, are bulky and waste materials, are inconvenient to manufacture, and are difficult to achieve more than five grades. [0003] Among the existing multi-stage split pumps, there are also single-stage impellers installed back to back, and the pressure of each impeller is superimposed until the outlet. Generally, the pressure of the seal chamber in the low-pressure area at the inlet end is small, and the seal chamber at the other end has to withstand the high pressure after the multi-stage impeller is pressurized. , The high-pressure end seal cavity bears a large pressure, which reduces the service life of the seal and i...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing centrifugal pumps use a single volute. If such a structure is used at a non-design point, a certain radial force will be generated. The more the deviation from the design point, the greater the radial force, which will affect the overall performance of the pump. The more unfavorable the smoothness of machine operation

[0005] 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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