US1638944A

US1638944A - Turbine aggregate

Info

Publication number: US1638944A
Application number: US701857A
Authority: US
Inventors: Ljongstrom Fredrik
Original assignee: Ljungstroms Angturbin AB
Current assignee: Ljungstroms Angturbin AB
Priority date: 1923-04-03
Filing date: 1924-03-25
Publication date: 1927-08-16
Anticipated expiration: 1944-08-16

Description

Aug. 16,1927. 1,638,944

F. LJUNGSTRM l TURBINE AGGREGATE Filed March 25, 1924 ,4 5 6 fg/ f2 5 /5 ff 3 9 /5 7 l j n G livglf if?? L Sf'lfz,

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Patented Aug. 16, 1927.

UNITED STATES PATENT OFFICE.

IREDBIK' LJUN'GSTRM, 0F LIDINGO-BBEVIK, SWEDEN, ASSIGNOR TO AKTIEBOLAGET IJUNGSTBMS NGTUBBIN, 0F LIDINGO-BREVIK, E JiWEIDIEiIN-, A CORPORATION.

TUBBINE AGGREGATE.

Application med March 25, 1924, Serial No. 701,857, and in Sweden April 3, A1923.

In turbine aggregates provided with condensers it has previously been proposed to arrange the condenser in such a way, that the shaft of the turbine passes through the condenser. By this arrangement the outlet of the turbine to the condenser will be very short. It has also been proposed to provide an electrical generator on the same shaft, which supports the blade system of the turbine aggregate. Constructions are also known, in which the electrical machine and the turbine are dis osed at opposite sides of the condenser. l owever, such constructions are connected with several disadvantages due to variations in temperature of the different parts of the turbine aggregate. Such disadvantages arise especially in case of using a high initial pressure of the supply steam.y and particularly in such cases, where the turbine aggregate comprises a plurality of turbines coupled in series, the turbines of the higher pressures being secured to shafts from which the power is transmitted to the slowest running shaft of the lower pressure turbine by means of toothed gearings. In such cases those parts, which are heated to very different temperatures, lie in relatively short distance from each other, and, consequently, the material might be jeopardizcd by stresses due to the variations in temperature occuring during operation, if the high pressure turbines,the

low pressure turbines, the condenser and the electrical machineare disposed on separate bases.

The present invention refers to turbine aggregates of such a type and has for its object to avoid such stresses due to varia tions in temperature. To attain this object the housing of the electrical machine is rigidly secured to the housing of the condenser, which, consequently, supports the turbine ag-l gregate as well as the electrical machine and is disposed on a base common to the aggregate as a whole.

The invention is shown diagrammatically in the single iigure of the annexed drawing illustrating as an example a turbine aggregate according to the invention.

In the form of embodiment shown, the turbine aggregate consists of three blade systems` 1, 2 and 3 forming high pressure, intermediate pressure and low pressure turbines, respectively. The turbines 1 and 2 working with back-pressure are assembled with a speed reducing toothed gearing to sure turbine 2 in the inlet part 6 of the The speeds of the low pressure turbine 3. turbines 1 and 2 are reduced by means of a toothed gearing located in the frame-work l to the same speed, with which the low pressure turbine rotates. Thus, the shaft 7 of the toothed gearing of the high pressure system rotating with the lowest speed has the same speed as the shaft 8 of the low pressure turbine, so that the shafts 7 and 8 which are located co-aXially may be directly connected at 9. By suspending, as above mentioned, the high pressure system with the discharge pipe 5 in the inlet part 6 of the low pressure turbine 3 and by making the shaft 7 so weak as to permit a certain "resiliency, variations in the dimension, due to variations in temperature, may be allowed in the different parts of the aggregate. The

ysteam passes first the turbines 1 and 2 in the succession mentioned above and then it passes the turbine 3, from'which it is discharged to the condenser.v

The condenser 10 is located adjacent the last blade rim of the low pressure turbine 3. It 1s apparent from the drawing that the exhaust steam passes directly into the condenser without changing the direction of movement. The discharge pipe of the low pressure turbine 3 will ybe very small or may be dispensed with entirely, so that the last blade rim of the low pressure turbine rotates in the proximity of or close to the condenser 10. The turbine shaft 8 passes through the condenser 10, which may be of any known type and provided with pumps and ejectors for the condensate and air. The turbine shaft 8 is connected directly to the rotor shaft 12 of the electrical generator 11. Thus, the condenser is located between the electrical generator and the turbine aggregate.

According to the invention the housing of the electrical generator 11 is rigidly secured to the housing of the condenser 10, to which the housing of the low pressure turbine 3 is also secured. The bearing 15 is common to the turbine and the generator,

and the bearings 14 and l5 of the turbine agregate lie at opposite sides of the conenser 10.

According to the invention the condenser and the turbine aggregate may be located at the same height as the electrical machine.

By this arran ement the machinist will be able to watch rom a single lace that everything is acting satisfactorll which is of great importance particular y in ship installations.

What I claim as new and desire to secure by Letters Patent of the United States of America is 1. A turbine aggregate comprising a turbine, an electrical generator and a condenser arranged between the turbine and the electrical generator, the housing of the electrical generator bein directly secured to and supported by the ousing of the condenser.

2. A turbine aggregate comprisin 'a plurality of turbines driving the same s aft, an electrical enerator secured on said -shaft and aicon enser arranged between the turbines and the electrical generator, the housing of the electrical generator being directly secured to and supported bythe housing of the condenser.

3. A turbine aggregate comprising a turbine, an electrical generator and a condenser arranged between the turbine and the electrical generator, the housin of the electrical generator being rigidl an directl 4secured 'to and supported by t e housing o the cc udenser, bearings for said turbine and ele?- trical generator, one of said bearings being common to the turbine and the electrical generator.

FREDRIK LJ UN GSTRM.