Substantiation and development of the procedure for calculating a hydraulic balancing device under condition of minimal energy losses

Pavlo Kalinichenko,Yuliya Krutas,Sergey Khovanskyy,Oleksandr Gusak

doi:10.15587/1729-4061.2017.97162

Pavlo Kalinichenko, Yuliya Krutas + Show 2 more

Open Access

https://doi.org/10.15587/1729-4061.2017.97162

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Abstract

Here we report the procedure for calculating a hydraulic balancing device from the condition of minimum of energy losses for the accepted value of static characteristic rigidity. The procedure proposed is different from those existing by that its basis is formed by a closed system of equations by the geometric parameters of a hydraulic balancing device, which is obtained from the condition of the minimum of energy losses for the accepted value of statistic characteristic rigidity. In order to determine the energy losses on the node of a hydraulic balancing device, we received calculation formulas for energy losses in the cylindrical and face chokes of a hydraulic balancing device, using an analogy of determiining the energy losses in a cylindrical pipe with round cross section. Results of the work are represented in the form of the given procedure for the calculation of a hydraulic balancing device and proposed mechanism of its realization that make it possible to obtain a unique solution of the closed system of equations for determining the geometric parameters of a hydraulic balancing device. Geometric parameters of a hydraulic balancing device, received in this way, provide for its reliable operation at minimal energy losses on it. The verification of the procedure for calculation and the study based on the calculation procedure from the condition of the minimum of energy losses are performed using the feed pump PE 600-300 (AO Sumy Plant NasosEnergoMash, Ukraine). Research results might be used for calculating the nodes of axial load of the rotor of a multistage centrifugal pump under condition of the minimum of energy losses at the accepted value of static characteristic rigidity of a hydraulic balancing device. In the present work we obtained a closed system of equations for finding the geometric parameters of a hydraulic balancing device from the condition of the minimum of energy losses for the accepted statistic characteristic rigidity.

Highlights

A hydraulic balancing device is the automatic device that balances axial force, which acts on the rotor of centrifugal multistage pump
Nf=f(R2) has a distinctly pronounced optimum on the en- a cylindrical pipe of round cross section, we obtained calculation dependences for finding the energy losses in the cylindrical and face chokes of a hydraulic balancing device that are a function of energy losses from the geometric parameters of a choke, rotation frequency of the surfaces and the mode of fluid flow
It is demonstrated that with an increase in the diameter of disk of a hydraulic balancing device, mechanical energy losses increase while the volumetric energy losses decrease

Summary

Introduction

A hydraulic balancing device is the automatic device that balances axial force, which acts on the rotor of centrifugal multistage pump. Existing procedures of static calculation [1, 2], as well as the proposed one [3], are based on determining the dimensions of cylindrical and face chokes of balancing the axial force of a pump. In this case, it is necessary to ensure a reliable work of the pump, which prevents contact between working surfaces of the face pair at minimum fluid leaks. That is why development of the procedure for calculating the hydraulic balancing device under condition of the minimal energy losses at the accepted rigidity of static characteristic of the unloading unit represents a relevant task.

Literature review and problem statement

The aim and tasks of the study

Findings

Conclusions