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Rear ring back-turning type balance drum of multi-stage pump

A balance drum and fold-back technology, applied in the field of balance drums, can solve the problems of low pump efficiency and large leakage in the sealing gap, and achieve the effects of improving efficiency, enhancing the balance effect, and compact structure

Inactive Publication Date: 2010-05-19
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of low pump efficiency due to the large leakage in the sealing gap between the balance drum and the balance sleeve of the existing multi-stage pump, the present invention provides a multi-stage pump rear ring return type balance drum

Method used

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  • Rear ring back-turning type balance drum of multi-stage pump
  • Rear ring back-turning type balance drum of multi-stage pump
  • Rear ring back-turning type balance drum of multi-stage pump

Examples

Experimental program
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Effect test

Embodiment Construction

[0010] figure 1 Among them, there is a return ring surface on the outer circle of the balance drum 1, the ring surface turns back from the direction of the rear pump chamber 4 to the direction of the balance chamber 3, and the axial length of the ring surface is L 1 It is 1 / 2~3 / 4 of the axial length L of the balance drum, and the thickness h 1 3~10mm; in the inner circle of the balance sleeve 2, there is a return ring surface corresponding to the outer circle return ring surface of the balance drum 1. This ring surface is turned back from the direction of the balance chamber 3 to the direction of the rear pump chamber 4, and the axial length of the ring surface is L 2 The axial length L of the outer circle of the balance drum 1 1 equal, thickness h 2 Thickness h of the outer circle of the balance drum 1 1 equal. The two return ring surfaces cooperate with each other to form an S-shaped sealing gap, and the gap value b is both 0.2-0.3mm. Under the condition that the pump r...

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Abstract

The invention relates to a rear ring back-turning type balance drum of a multi-stage pump. The excircle of the balance drum is provided with a back-turning ring surface, the inner circle of a balance sleeve is provided with a back-turning ring surface corresponding to the back-turning ring surface of the excircle of the balance drum, and the two back-turning ring surfaces are mutually matched to form an S-shaped sealing gap, wherein the gap has the effect of increasing resistance on media passing through the gap. The front and the back of the balance drum form a balance force opposite to the sucking direction of the pump, and the balance force is used for balancing unbalanced axial forces such as impeller cover plate force, and the like acting on a rotor. By changing the seal between the balance drum and the balance sleeve into a labyrinth seal, the invention reduces the length of the balance drum, effectively reduces the leakage quantity, enhances the balance effect, improves the efficiency of the pump and optimizes the structure.

Description

technical field [0001] The invention relates to a balance drum used for balancing the axial force of a multi-stage pump, in particular to a rear-ring turnback type balance drum of a multi-stage pump that can reduce leakage, improve pump efficiency, and has a simple structure. Background technique [0002] Multistage pumps often use balance discs or balance drums to balance the axial force generated during operation. The balance drum is installed behind the final stage impeller and rotates with the rotor. The front is the high-pressure rear pump chamber of the final stage impeller, and the back is the low-pressure balance chamber connected to the suction port. An axial gap is formed between the outer surface of the balance drum and the balance sleeve. When the high-pressure liquid flows through this gap, pressure loss occurs, and a pressure difference is formed before and after the balance drum to balance the axial force generated by the operation of the multi-stage pump. Thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/041F04D29/051F04D29/08
Inventor 孔繁余王文廷
Owner JIANGSU UNIV
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