Turbomachine having a temperature-controlled cover

Abstract

A turbomachine, comprising a lower housing part, an assembly inserted into the lower housing part from above, comprising two opposite housing covers and a rotor having a shaft, the rotor being fed through both housing covers, and an upper housing part that encloses the assembly from above and is fastened to the lower housing part, is provided. A shaft seal is arranged between the cover and the shaft. To maintain good function of the shaft seal during operation using cold or hot gases, at least one of the covers has a temperature-control means guided around the shaft, having a first and a second temperature-control channel, for controlling the temperature of the lid in the area around the shaft.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to PCT Application No. PCT / EP2013 / 053911 having a filing date of Feb. 27, 2013, based off of DE 102012203144.8 having a filing date of Feb. 29, 2012, the entire contents of which are hereby incorporated by reference.FIELD OF TECHNOLOGY[0002]The following relates to a turbomachine having a lower housing part, an assemblage—which is placed in the lower housing part from above and comprises two mutually opposing housing covers and a rotor, guided between the two housing covers, having a shaft—and an upper housing part, which encloses the assemblage from above and is secured to the lower housing part.BACKGROUND[0003]Turbomachines are used to expand or compress gases. Thus, in the case of a turbine, inlet gases are introduced into the turbine at high pressure and expand there, giving off energy to the rotor. Compressors, on the other hand, are used to compress air or other gases to final pressures of up to 100 ...

AI Technical Summary

Benefits of technology

The patent text describes a problem with large machines where the dimensions of the cover mean that the thermal expansion per degree of temperature change is accordingly large, making it difficult to solve the problem by good thermal insulation and sealing of the shaft. The text suggests that the use of a radially outer and inner temperature-control duct can effectively shield the radial innermost region against heat or cold from an inflow guiding device. The technical effect is a more effective solution for controlling temperatures in large machines.

Problems solved by technology

Leakage steam from the turbine housing and radiant heat from the turbine housing can lead to undesirable heating of the bearing lubrication oil in the bearing housings of the pillow blocks.

This also affects the two axial covers of the housing, which cool down or heat up relatively rapidly and greatly relative to the shaft and the housing.

If such a cooling or heating acts on the sealing region, this can lead to drawbacks with respect to the seal.

If the cover around the shaft cools down, it contracts such that the gap grows and the seal deteriorates.

Consequently, the seal gap must be dimensioned so as to be relatively large, which is not conducive to a good seal.

While this problem can be satisfactorily solved in smaller machines by good mounting of the shaft and appropriate dimensioning of the sealing gap, the problem is more difficult to solve in large machines.

Undesirable heat or cold can penetrate to the shaft seal not just from radially outside but also in the axial direction.

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