Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A hydraulic design method for reducing a multi-stage pump lift curve hump

A head curve and hydraulic design technology, which is applied to components, pumps, and calculations of pumping devices used for elastic fluids, can solve problems such as reducing system reliability and pumps cannot operate normally, and reduce losses and energy Loss, effect of good matching relationship

Active Publication Date: 2019-06-14
SANLIAN PUMP IND CO LTD
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The head curve of low specific speed is prone to "hump" phenomenon. The hump area is an extremely unstable working condition area for multi-stage pumps, often accompanied by negative phenomena such as vibration and noise, which greatly reduces the reliability of the system. At the same time, the multi-stage pump has an "inert" accumulation and amplification effect, so that the effect of this negative effect is continuously accumulated and amplified. When the multi-stage pump operates to a certain extent, the accumulated effect of the negative effect will be destructive to the shaft, bearing and seal. is irreversible and prevents the pump from operating normally

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A hydraulic design method for reducing a multi-stage pump lift curve hump
  • A hydraulic design method for reducing a multi-stage pump lift curve hump
  • A hydraulic design method for reducing a multi-stage pump lift curve hump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0074] Embodiment: select multi-stage pump product performance parameter flow rate Q=85m 3 / h, head H=80m, speed n=2950r / min, gravity acceleration g=10m 2 / s, take β 2 =23°,δ 3 =3mm, calculate the hydraulic parameters of impeller and guide vane according to the above-mentioned content of the invention as follows:

[0075] Specific speed n s Calculated as follows:

[0076]

[0077] In the formula:

[0078] no s — specific speed;

[0079] Q—flow rate, cubic meter per second;

[0080] H—head, m;

[0081] n—rotational speed, rev / per minute;

[0082] no s =((3.65×2950×(85 / 3600)^0.5) / (80^0.75))=62;

[0083] Impeller outlet diameter D 2 Calculated as follows:

[0084]

[0085] In the formula:

[0086] D. 2 —Impeller outlet diameter, m;

[0087] no s — specific speed;

[0088] g—gravitational acceleration, m / square second;

[0089] H—head, m;

[0090] n—rotational speed, rev / per minute;

[0091] D. 2 =(27.8×((62 / 100)^0.1)×(10×80)^0.5) / 2950=0.255m;

[0092] I...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a hydraulic design method for reducing a multi-stage pump lift curve hump, and relates to the technical field of water pumps. The method is mainly used for solving the problem that a multistage pump has a hump phenomenon in a small-flow area, the main positive guide vane hydraulic parameters are derived from the main hydraulic parameters of the impeller according to a certain mathematical algebraic relationship; the outlet width of the impeller is defined; the outlet diameter of the impeller and the outlet placement angle of the impeller blade are parent item derivationto design the inlet diameter of the child item positive guide blade; the inlet width, the guide vane placing angle, the guide vane outlet diameter and the guide vane diffusion section length are improved, the permeability between the impeller and the guide vanes is improved, the impeller and the guide vanes have a good matching relation, and therefore the loss in the guide vanes under the small-flow working condition is reduced, and the hump degree of a lift curve is reduced.

Description

technical field [0001] The patent of the present invention relates to the technical field of water pumps, in particular to a hydraulic design method for reducing the hump of the lift curve of a multistage pump. Background technique [0002] As a general-purpose machine, pumps play an important role in the development of society. It can be said that pumps exist wherever liquid flows. As one of the main members of the pump, the multi-stage pump is mainly characterized by the large pressure energy obtained by the system through the series action of multiple impellers through the guide vanes of each level. The outer diameter brings high cost and inefficiency, and it can work for piping systems with large pressure changes in applications. Due to the particularity of the multi-stage pump structure, the head obtained by each stage is as large as possible to reduce the relative number of stages. Therefore, the specific speed corresponding to each stage is relatively low. The head ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50F04D29/18F04D29/40
Inventor 褚仁虎钟华舟王卫东陈德云
Owner SANLIAN PUMP IND CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com