Single Stage Supercharger Drawing

Contents

Introduction

1. Calculation of thermophysical properties of natural gas

2. Development of supercharger diagram and determination of main parameters

3. Impeller calculation

4. Calculation of blade-free diffuser

5. Output device calculation

6. Refined Efficiency Calculation

7. Strength calculation of the supercharger housing

8. Construction Description

Conclusion

Bibliographic list

Introduction

The main objective in the design of the supercharger is to achieve maximum economy and reliability at a minimum cost. Designed supercharger is designed for compression of natural gas as part of GPA with drive from GTE NK1618ST and its transportation via main gas pipelines with operating pressure of 7.45 MPa.

During calculation parameters of working medium in reference sections and geometric dimensions of blower flow part are determined. Since the initial data do not contain the value of the final gas temperature, the polytrope index is set taking into account the recommendations on the values ​ ​ of the polytropic efficiency of the supercharger. One-stage supercharger with axial half-open impeller is selected. Compressible medium - natural gas of the Saratov field.

Source Data:

Volume capacity of compressor shop Q_c=90∙〖10〗^6 m ^ 3/day

Initial pressure of R_n gas is =5.14 MPas

Degree of pressure increase pi _ c = 1.45

Reference temperature of T_n gas =282 K

Supercharger shaft speed n = 5300 ob⁄min

Construction Description

The designed supercharger is a single-stage machine with a cantilever arrangement of the impeller. Supercharger shaft has support and thrust bearing with two thrust working blocks.

Axial wheel of semi-open type with all-cutter blades. Angle of blades installation at outlet from impeller 90 °, at inlet to rotating guide vane 31 °. Wheel is fitted on shaft with tension and fixed on it by means of key.

Blade-free diffuser with radial length of 142 mm. The collection chamber is circular with rectangular section. Suction branch pipe is located radially, and delivery branch pipe is tangential.

End cover is installed by means of special accessory

Rotor support units - sliding bearings. Support bearing receives radial load and consists of two halves of steel housing with babbit filling. Babbit mark B83. The thrust bearing has one thrust insert and two thrust bearings, since there is no discharge piston in the supercharger structure. Thrust blocks are made of bronze with babbit filling.

Turbine oil TP22 is used for lubrication of bearing units. The supercharger has an oil tank, from where oil under pressure is supplied to seals and support units, and there is also an oil accumulator.

Internal seal of labyrinth-type supercharger is stepped.

The supercharger has a bushing-flange clutch for attachment of the flush shaft.

Conclusion

In the course design, a single-stage natural gas blower was calculated with the determination of the main gas-dynamic parameters and geometric dimensions, and the strength of the blower body was also calculated. The updated efficiency value was 79%, which corresponds to the experimental data for high pressure oseradial wheels of the semi-open type. Based on the results of the calculation, a longitudinal section of the supercharger was built.

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