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Paper pulp pump centrifugal open impeller based on fiber suspension flow design criteria

A technology for open impellers and pulp pumps, which is applied to parts, pumps, and pump components of pumping devices for elastic fluids, and can solve problems such as lack of constraints and limited application areas, so as to improve passing capacity and hydraulic efficiency Effect

Inactive Publication Date: 2010-09-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Approximating the pulp pump impeller by modifying the design scheme of the clean water pump impeller is a semi-empirical formula. Up to now, there is no set of calculation formulas with clear theoretical basis to complete the calculation of relevant parameters.
There is a large degree of freedom in the selection and determination of parameters, and there is a lack of sufficient constraints
The second method can use the similar conversion algorithm. The conversion requires a model machine with better performance, so its application is limited.

Method used

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  • Paper pulp pump centrifugal open impeller based on fiber suspension flow design criteria
  • Paper pulp pump centrifugal open impeller based on fiber suspension flow design criteria
  • Paper pulp pump centrifugal open impeller based on fiber suspension flow design criteria

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0038] Working condition: Flow Q=100(m 3 / h), lift H=20(m), speed n=1450(rev / min).

[0039] Substituting the formula to calculate the specific parameters:

[0040] Outlet Diameter: D 2 =280(mm)

[0041] Exit Width: b 2 =35(mm)

[0042] Blade inlet width: b 1 =61.4(mm)

[0043] Blade inlet diameter D 1 =97.0(mm)

[0044] Impeller inlet diameter D j =121(mm)

[0045] The inlet angles of the blades are 22°, 26.4° and 30° at the streamlines of the front disc, the middle streamline and the rear disc, respectively. The blade exit angle is 30°.

[0046] Starting from the fact that the additional stress is more prominent in the middle of the curve, it is required to constrain the relative velocity distribution across the channel to be flat, so it is better to keep the blade load distribution flat, that is, to extend the length of the blade channel appropriately. The structural parameter related to this constraint is the blade wrap angle and the equivalent expansion angle, ...

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Abstract

The invention discloses a paper pulp pump centrifugal open impeller based on fiber suspension flow design criteria, which mainly consists of a hub and three blades, wherein the three blades are evenly distributed on the hub along the circumference and is integrated with the hub into a whole. The paper pulp pump centrifugal open impeller is applicable to conveying slurry with medium and low concentration, can better control the slurry to flow in an impeller channel, improves the passing capability of paper pulp, increases the hydraulic efficiency of the impeller, and has the convey efficiency which is obviously superior to the common paper pulp pump which is widely used at present.

Description

technical field [0001] The invention relates to an impeller of a pulp pump, in particular to a centrifugal open impeller of a pulp pump based on the design criterion of fiber suspension flow. Background technique [0002] Pulp pump is one of the key equipment in the papermaking industry, and it is also an important energy-consuming equipment. Once the efficiency can be improved, it will be very beneficial to tap the energy-saving potential of the papermaking process. [0003] The key component of the pulp pump is the impeller. Among the various design methods of the pulp pump impeller, the method of increasing the flow rate is adopted to convert the working condition of conveying pulp into a clear water design with an increased flow rate at the same head speed. Approximating the pulp pump impeller by modifying the design scheme of the clean water pump impeller is a semi-empirical formula. Up to now, there is no clear calculation formula based on the theory to complete the ca...

Claims

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Application Information

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IPC IPC(8): F04D29/24
Inventor 林建忠张启华李月仙王灿星
Owner ZHEJIANG UNIV
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