Turbomachine having a compensating piston

Inactive Publication Date: 2011-11-24
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]Starting from the aforesaid problems, the invention has been based upon the object of reducing the loss of process fluid which arises on the balance piston and thus improving the efficiency of the machine.
[0008]For achieving the object, it is proposed according to the invention that the stator is designed with guided movement capability in such a way that the gap can be increased and decreased. On account of the design of the stator with guided movement capability, a gap width which is adapted to the current operating conditions of the turbomachine can be established, the gap width being smaller than that which is required under other operating conditions, so that the differential amount of the quantity of process fluid which flows through the balance piston is saved for the benefit of efficiency improvement.
[0009]An advantageous development of the invention provides that the stator by one surface is adjacent to the cavity and is designed in such a way that, depending upon the pressure in the cavity, it is displaced in such a way that the gap increases or decreases. This type of design opens up the possibility of realizing a gap width of the seal on the balance piston which is automatically adapted to the pressure in the cavity without additional actuators, which move the stator, or without a complicated control system.

Problems solved by technology

The quantity of process fluid which flows through the balance line can have a significant value and can considerably lower the efficiency.
This effect becomes worse if the shaft seal on the balance piston is worn as a result of erosion or rubbing on the stator, and consequently slackness increases.

Method used

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  • Turbomachine having a compensating piston
  • Turbomachine having a compensating piston

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Embodiment Construction

[0017]FIG. 1 shows a compressor or a turbomachine T with a casing CAS and a rotor R which extends along a machine axis X. The rotor R has an impeller IMP—being the rotor wheel of a centrifugal compressor in this case—by means of which a process fluid PF, by a rotation at the speed n of the rotor R, is compressed from a first pressure pl to a higher second pressure p2. For this purpose, the process fluid PF enters the casing CAS through an inflow IN and leaves the casing through an outflow EX. Before the process fluid PF leaves the casing CAS through the outflow EX, it accumulates partially in a pressure chamber PCH. Adjacent to the pressure chamber, the rotor R is provided with a balance piston BP. The balance piston BP basically has a disk shape which, with the two-dimensional extent, extends perpendicularly to the machine axis X, that is to say correspondingly has a first shaft step RS1, which in this case is adjacent to the pressure chamber PCH, and a second shaft step RS2, which...

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Abstract

A turbomachine including a compensating piston that is sealed by means of a seal with respect to a stator is provided. Conventional compensating pistons consume significant amounts of process fluid, which can cause a considerable loss of efficiency. The turbomachine provides the solution in that the stator partially carrying the seal is designed to be axially moveable in the housing such that the permeability of the seal can be changed in this way.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the US National Stage of International Application No. PCT / EP2010 / 050643, filed Jan. 20, 2010 and claims the benefit thereof. The International Application claims the benefits of German application No. 10 2009 007 713.8 DE filed Feb. 5, 2009. All of the applications are incorporated by reference herein in their entirety.FIELD OF INVENTION[0002]The invention refers to a turbomachine with a balance piston, which balance piston has at least one shaft step on a rotor which extends along a machine axis, and a seal, which seal seals a gap between the rotor and a stator so that during operation a cavity which is adjacent to a first side of the seal can have a pressure which, by a pressure differential across the seal, differs from that on the other side of the seal, wherein the shaft step is adjacent to the cavity.BACKGROUND OF INVENTION[0003]In turbomachines, for example steam turbines, gas turbines or compressors, especiall...

Claims

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Application Information

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IPC IPC(8): F01D11/20
CPCF01D3/04F04D29/0516F04D29/0416
InventorVAN DER SPAN, PATRICK
OwnerSIEMENS AG