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Multi stage centrifugal pump system

A technology of centrifugal pumps and units, applied in the direction of pumps, pump components, pump devices, etc., can solve the problem of not ensuring continuous injection of liquid

Inactive Publication Date: 2012-10-17
GRUNDFOS MANAGEMENT AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this centrifugal pump unit is that it must first be evacuated of air and filled with liquid when it starts to operate
This is disadvantageous in certain use cases, e.g. in fire extinguishing installations where continuous injection of liquids, especially water, cannot be ensured

Method used

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  • Multi stage centrifugal pump system
  • Multi stage centrifugal pump system
  • Multi stage centrifugal pump system

Examples

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Embodiment Construction

[0055] The centrifugal pump unit shown by way of example has a total of 8 stages, ie 8 impellers. Among them, two impellers 2 are arranged in the first impeller group 4 , and six impellers 6 are arranged in the second impeller group 8 . The first impeller set 4 faces the inlet or suction branch 10 of the pump unit. The second impeller set 8 is connected in series with the first impeller set in the flow or conveying direction. As in known multi-stage centrifugal pump assemblies, the liquid to be conveyed flows successively through the individual impellers and is conveyed from the outlet side of each other to the individual impellers and then from the outlet side of the last impeller 6 through the annular pressure channel 12 to the pressure branch pipe 14. All impellers 2 and 6 are driven by a common shaft 16 . The shaft 16 is connected at its shaft end 18 to an electric motor, not shown here, for example a drive motor.

[0056] The first impeller set 4 is self-priming in th...

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Abstract

A multi-stage centrifugal pump assembly includes at least two impellers (2, 6) and two impeller groups (4, 8) which are consecutive in a flow direction and each with at least one impeller (2, 6). A backflow channel (24) connects an exit side of the first impeller group (4) to an entry side thereof is located in a first impeller group (4) of the two impeller groups (4, 8).

Description

technical field [0001] The invention relates to a multistage centrifugal pump assembly with at least two impellers, ie an at least two-stage centrifugal pump assembly. Background technique [0002] In this multi-stage centrifugal pump unit, a plurality of impellers are arranged successively along the conveying direction, so that the pressure is increased step by step. The problem with such centrifugal pump assemblies is that they must first be evacuated of air and filled with liquid when they start to operate. This centrifugal pump unit is not self-priming. This is disadvantageous in certain use cases, for example in fire extinguishing installations where continuous injection of liquid, in particular water, cannot be ensured. In such installations it is important that the pumps used are self-priming. Contents of the invention [0003] Therefore the object of the present invention is to improve the multi-stage centrifugal pump unit so that it becomes self-priming. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D9/02F04D29/22F04D29/00
CPCF04D9/02F04D13/10F04D1/063F04D9/005
Inventor 斯滕·米克尔森奥格·布鲁恩布·默勒·詹森
Owner GRUNDFOS MANAGEMENT AS
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