Multi-stage centrifugal pump capable of self-balancing axial force by impeller

A technology of axial force and centrifugal pumps, applied in radial flow pumps, components of pumping devices for elastic fluids, pumps, etc., can solve multi-stage centrifugal pump damage, difficulty in design and manufacture of balance plate devices, damage and other problems, to achieve the effect of low manufacturing cost and solve the problem of axial force damage

Inactive Publication Date: 2006-08-09
JIANGSU UNIV
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Problems solved by technology

Among these four methods, only the balance disc device can fully automatically balance the axial force, and the other three methods have residual axial force. For multistage centrifugal pumps, the residual axial force is sometimes very large, so There is still a possibility of damage
However, the design and manufacture of the balance plate device is very difficult. Since the a

Method used

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  • Multi-stage centrifugal pump capable of self-balancing axial force by impeller

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Embodiment Construction

[0013] figure 1 The shown embodiment is a deep well centrifugal pump, which is also a vertical multistage centrifugal pump. It consists of a three-stage impeller (13) and a guide casing (5) together with a water inlet section (1) and a water outlet section (15) ) in series, the diversion case guide vane (14) is an anti-guide vane, the water inlet side has a diversion case front cover (4), the water outlet side has a diversion case rear cover (6), and the impeller has an impeller For the closed impeller of the front cover plate (7) and the impeller rear cover plate (8), the outer diameter of the impeller rear cover plate is smaller than the outer diameter of the impeller front cover plate, and the area of ​​the impeller front cover plate is larger than the area of ​​the impeller rear cover plate, The fit (9) between the outer diameter of the front cover plate of the impeller and the guide shell is clearance fit, the impeller inlet adopts the end face seal, and the impeller is c...

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Abstract

Said invention refers to multistage centrifugal pump with impeller self balancing axial force. Said invention adopts end surface sealed structure on impeller entrance, the impeller band being greater than impeller hub area, the fit between impeller band outside diameter with diversion shell being clearance fit, impeller entrance end surface sealing sub being thrust bearing sub etc method to realize completely balancing axial thrust effect depending on impeller itself, thoroughly solving multistage centrifugal pump axial force destruction problem, and reducing multistage centrifugal pump production costs.

Description

Technical field [0001] The invention relates to a fluid machine for increasing liquid pressure, in particular to a multistage centrifugal pump which needs to overcome axial force. Background technique [0002] At present, the known multi-stage centrifugal pumps have serious axial force problems, because when the impellers are working, axial forces will be generated on the impellers, and the multi-stage centrifugal pumps have more impellers, and the axial force problems will be serious . Generally, single-stage centrifugal pumps use radial seal rings and balance holes or back blades on the impeller to balance part of the axial force, and the remaining axial force is borne by the bearing, while multi-stage centrifugal pumps generally use balance drums or balance discs. These two methods are used to balance the axial force. Among these four methods, only the balance disc device can fully automatically balance the axial force, and the other three methods have residual axial fo...

Claims

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Application Information

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IPC IPC(8): F04D29/66F04D1/08
Inventor 陆伟刚施卫东张启华张金风
Owner JIANGSU UNIV
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