Centrifugal pump design

Contents

Introduction

1. Hydraulic calculation

1.1 Calculation of parameters at the wheel inlet

1.2 Calculation of parameters at wheel outlet

1.3 Calculation of approximate profile of blades

1.4 Calculation of leaks and volumetric efficiency

1.5 Calculation of hydraulic efficiency of blade wheel

1.5.1 Friction losses in inter-blade channels

1.5.2 Vortex loss

1.5.3 Diffuser losses

1.5.4 Total head loss in the impeller

1.6 Calculation of theoretical pump head

1.7 Calculation of spiral branch

1.7.1 Calculation of diversion

1.7.2 Spiral Tap Losses

1.7.3 Conical diffuser losses

1.8 Calculation of spiral retraction

1.9 Calculation of axial force acting on the pump rotor

1.10 Calculation of radial force acting on impeller

2. Pump strength calculation

2.1 Calculation of shaft diameter

2.2 Calculation of key connection

2.3 Coupling Selection and Calculation

2.4 Strength calculation of half-coupling housing

2.5 Selection and calculation of bearings

Conclusion

List of used literature

Assignment for course work:

Design of centrifugal pump

Variant No. 06

Source Data:

Flow through pump Q = 50m3/h;

Pump head H = 12.5 m;

Number of revolutions 1450rpm;

Excessive pressure at the inlet of PBX = 1.013 * 105Pa;

Liquid density γ = 1000;

Dynamic viscosity of liquid μg = 1.01 * 103;

Vapour elasticity pressure Rp = 2.314 * 103Pa;

Normal blade thickness:

- at input δ1 = 0.005;

- at output δ2 = 0.01.

Sample assembly drawing.

Introduction:

Pumps and pumping equipment.

In life and in his development, man always felt the need to move (transport) various substances, hydraulic mixtures, as well as loose, viscous and other materials.

The device for the pressure movement of materials (suction and discharge), mainly liquids, with the communication of external energy to them was called a pump. invention relates to ancient times. The history of the development of the naso-structure, like all the development of technology, is connected with the needs of human society at each stage of its development, and many of the minds of mankind are involved in it.

In accordance with GOST 1738972, the classification of all pumps is divided into types and varieties according to various features, for example, according to the principle of design action.

Conventionally, pumps can be divided into two groups:

pumps-machines driven by engines;

pump-apparatuses operating at the expense of other energy sources and having no moving working elements.

Pumps-machines are:

- vane (centrifugal, axial, vortex);

- volume (piston, rotor, gear, screw, re-installation, etc.).

Pumps - devices are:

- inkjet;

- gas elevators (including airlifts);

In addition, devices and other applications are known:

- vacuum pumps;

- heat pumps.

Vane pumps are the main type of pumps (at least 75% of industrial pumps) in terms of productivity, versatility and prevalence.

Conclusion

In this course design, an electric pump unit is designed. Hydraulic calculation of centrifugal pump with determination of main geometrical dimensions of flow part is performed. Radial and axial forces acting on the rotor are calculated.

A strength calculation of the pump was made, as a result of which the geometric dimensions of the shaft, keys, splines, bolted connection of the housing parts, bearings of the support rack were determined while ensuring the durability of 10000 hours of continuous operation and the housing.

In the process of catalogue work and reference information, elements of the electric pump unit, such as an electric motor, a clutch transmitting torque from the electric motor to the pump, seals of the body parts, a flow part and support posts, are selected.

According to the rules of machine-building drawing, the assembly drawing of the electric pump unit is presented in this course design.