Fully-enclosed suspension type multistage centrifugal pump for transporting high-pressure freon

Abstract

The invention relates to a fully-enclosed suspension type multistage centrifugal pump for transporting high-pressure freon. The fully-enclosed suspension type multistage centrifugal pump comprises a fully-enclosed housing and a pumping set inner core, wherein the fully-enclosed housing is formed by welding a pump cover, a sleeve, an inlet and outlet tube, a base and a sealing wiring post, and capable of bearing high pressure; the pumping set inner core comprises a partition board, a multistage impeller, a multistage guide blade body, a shaft, an upper bearing base, a lower bearing base, an upper bearing, a lower bearing, and a fluorine resistant motor comprising a stator and a rotator, wherein the inner core is suspended below the partition board, and fully arranged in the fully-enclosed sealed housing, so that the pump does not have a movable sealing surface and a static sealing surface, and a high-pressure Freon leakage problem can be completely solved; and the motor rotator and the multistage impeller are arranged on the same shaft without transmission loss, so that the integral structure is simple and reliable, and the efficiency is high.

Description

technical field [0001] The invention relates to a multistage centrifugal pump, in particular to a fully enclosed suspended multistage centrifugal pump for conveying high-pressure Freon. Background technique [0002] In precision air-conditioning systems, small-flow centrifugal pumps that deliver high-pressure Freon are required: first, the pressure of Freon is high (usually 2.5-5MPa), and the system requires zero leakage of the pump, so the pump unit must not have a dynamic seal, and it is best to cancel the static seal; secondly , the system requires small pump flow (usually 0.5~2m3 / h), high head (usually 25~50m), single-stage centrifugal pump efficiency is extremely low, or even unsatisfactory; again, the transmission medium is low temperature (-40 ℃) freon, for The low temperature resistance of the pump is very high; in addition, the precision air conditioning system is an important equipment for protecting the large database computer room, and the reliability of the ...

AI Technical Summary

Problems solved by technology

[0002] In precision air-conditioning systems, small-flow centrifugal pumps that deliver high-pressure Freon are required: first, the pressure of Freon is high (usually 2.5-5MPa), and the system requires zero leakage of the pump, so the pump unit must not have a dynamic seal, and it is best to cancel the static seal; secondly , the system requires small pump flow rate (usually 0.5~2m3 / h), high head (usually 25~50m), single-stage centrifugal pump efficiency is extremely low, or even unsatisfactory; again, the transmission medium is low temperature (-40 ℃) Freon, for The low temperature resistance of the pump is very high; in addition, the precision air conditioning system is an important equipment for protecting large database computer rooms, and the reliability of the pump is extremely high

The existing small-flow pumps for transporting freon usually use a magnetic-driven multistage pump. First, the static seal of the pump has a small amount of leakage; second, the magnetic coupling has a complex structure, is difficult to manufacture, and has a high production cost; finally, the magnetic coupling Low transmission efficiency, no energy saving

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