Vertical type multilevel barrel bag pump

A barrel pump, vertical technology, applied in the field of vertical multi-stage barrel pumps, can solve problems affecting pump efficiency, poor performance, large fluid energy loss, etc., to improve efficiency and operational reliability, and shorten the height of barrel bags and volume, easy installation and maintenance

Inactive Publication Date: 2008-11-12
ZHEJIANG PUMP GENERAL WORKS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In order to improve the cavitation performance of the pump (that is, reduce the NPSHr value), there are also examples of using double-suction impellers in the first-stage suction section, such as the LN25-110 condensate pump produced by Shenyang Industrial Pump Manufacturing Co., Ltd. The suction impeller and the matching symmetrical single-channel volute are composed. Although the vertical multi-stage barrel pump with this structure improves the cavitation performance of the pump to a certain extent, there are still shortcomings: one is Because there is no front inducer, the inlet pressure of the fluid in

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  • Vertical type multilevel barrel bag pump
  • Vertical type multilevel barrel bag pump

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Embodiment Construction

[0008] The structure of the upper half of the vertical multistage barrel pump according to the present invention is the same as that of the conventional vertical multistage barrel pump, so it will not be repeated here. refer to figure 1 As shown, the present invention includes basic components such as a rotating shaft 4, a rear-stage pump body 3, an impeller 2, and a barrel bag 1, and also includes a first-stage pump body 5 with a double-channel radial volute 5-3. On the shaft 4 at the center of the volute 5-3, a double-suction impeller 10 is housed, and on the shaft 4 above and below the double-suction impeller 10, a front inducer 6-1, 6-2 is respectively provided, and the inducer 6- 1 and 6-2 are placed in the matching suction conduits 5-1 and 5-2, and the suction conduits 5-1 and 5-2 are connected with the primary pump body 5. The above-mentioned double-suction impeller 10 is formed on the basis of the single-suction impeller, with the back surface of the single-suction im...

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Abstract

The invention discloses a vertical multi-level barrel pump which is characterized in that a first level absorption section of the barrel pump adopts a dual absorption impeller and a first level pump body matched with the dual absorption impeller and provided with a dual channel and a radial volute shell; the rotating shafts above and under the dual absorption impeller are respectively provided with a preposed inducer and an absorption guide pipe matched with the preposed inducer so as to realize the dual absorption of pumped fluid. Under the condition that the flow is limited, the value r of net positive suction head (NPSH) can be reduced by more than 1.5m, namely the cavitation corrosion performance is remarkably improved, thereby not only reducing the height and volume of the barrel and the manufacturing cost, but also improving the efficiency and the operation reliability of the pump and bringing convenience for the installation and the maintenance of the pump.

Description

technical field [0001] The invention relates to a vertical multi-stage barrel pump used for pumping condensed water of a steam turbine or a liquid in a high-vacuum airtight container, especially a vertical multi-stage barrel pump with a bidirectional suction function at the first stage. Background technique [0002] At present, most of the first-stage suction sections of vertical multi-stage barrel pumps produced at home and abroad use single-suction impellers. In order to improve the cavitation performance of the pump (that is, reduce the NPSHr value), there are also examples of using double-suction impellers in the first-stage suction section, such as the LN25-110 condensate pump produced by Shenyang Industrial Pump Manufacturing Co., Ltd. The suction impeller and the matching symmetrical single-channel volute are composed. Although the vertical multi-stage barrel pump with this structure improves the cavitation performance of the pump to a certain extent, there are still ...

Claims

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Application Information

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IPC IPC(8): F04D29/42F04D29/66F04D29/24F04D1/06
Inventor 余伟平牟介刚罗先武
Owner ZHEJIANG PUMP GENERAL WORKS
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