US1020703A - Protective device for turbines. - Google Patents

Description

W. KIESER.

PROTECTIVE DEVICE FOR 'rnmamns.

APPLIOATIOK FILED 831130, 1909.

Patented Mar. 19, 1912..

Inventor: +Walber" Kieser;

Wilmesses: i 1

exhaust steam from a atmospheric pressure also,

pipe is duit 4., which. preferablv AENT b h litllfa .wenrnnnrssnaor BERLIN, GERMANY, ASSIGNOR T0, GENERAL niincrnrc contranr,

A CORPORATION OF NEW YORK.

PROTECTIVE DEVICE FOR TURL'EINESL To all whom it may concern.-

Be it known that I, lV'AL'rER KInsnR, a

citizen of Switzerland, residing at Berlin,

Germany, have invented certain new -and Protective Devices useful Improvements in the followmg 1s a for Turbines, of which specification.

'This invention relates to elastic fluid turbines and especially to those driven by the high pressure reciproeatingengine or engines, or other source. lVhen such high pressure engines run intermittently,'it is customary to discharge the exhaust steam into an accumulator, whichfurnishes a steady supply to the turbine. In other'cases no accumulator is. used. But if too little steam. is supplied directly or happen that. fall below atmospheric In this event the pressure in the tend to drop below which would Or,

pressure. turbine casing would cause a suction of air into said casing.

if the turbine is connected with the live steam main in order to supplement the supof low pressure steam, this drop below atmospheric pressure in the accumulator,

'would tend to drain off the live-steam. from the turbine into the accumulator.

The object of the present invention is to prevent these and other ditliculties, and..to this end the invention consists in a check valve in the pipe supplying the low pressure steam arranged to be closed automatically bv the atmospheric pressure when it exceeds that ofthe steam in said pipe. Thisv valve more'm ei is used as an emergency-cutoff in v casethc turb ne races. The turbine is also.

supplied with live steam to supplement the low pressure "supply when necessary and a quick-closing cutoff valve in, the live steam connected with the emergency mechanism so that it too will be closed simultaneously with the valve in the exhaust steam piper,

The accompanying drawing one embodiment of my invention, anism being shown partly in section, a certain extent diagrammatically.

The turbine selected to illustrate the invention is a two stage machine, having one illustrates the mechand to wheel 1 supplied with live steam through the conduit 2 .and the other wheel 3 supplied with eXhaust steam through the concommumcates with Application filed September 30, 1909. Serial No. $20,358. v

v Specification of Letters Patent. P ttg t fl M1 1, 319 191:2},

the exhaust side of the first wheel,-but the inventionis not limited to this typeof'turbine. The admission of live steam is con trolled by a slide ports 6, while the admission. of exhaust steam, is controlled by ing with the ports 8-. Both valves are actuated simultaneously by the rod 9 which is connected in any suitable manner with a centrifugal speed governor 10 driven from the shaft 11 of the turbine.

In the conduit at, between some suitable source. of supply of exhaust steam (not shown) and the valve 7, is located the check valve 12, arranged to close toward the source, so that under ordinary conditions it will be opened by the steam flowing tothe turbine. The check valve is connected with ,a movable abutment, preferably a piston 13 on the stem of the valve. One side ofthe valve 5 moving over the the valve 7 cooperathaust steam after itpasses the valve, while the. other sideofsaid piston is exposed to the' atmospheric pressure.- Mounted in a frame above said piston, and in line with the line of movement thereof, is a han'nner, preferably a rod l urgeddownwardly by a spring 15, but held in a raised positionby a latch 16. On the shaft of the turbine is an emergency governor 17,; which, when" the .turbine exceeds a predetermined speed, foperates to trip said latch, through suitable mechanism, such as the rods and levers 18. This mechanism is also connect-ed to a quickclosing valve 19 which controls the fiowof live steam through the pipe 20 tothe first stage of the turbine. w

The operation of the invention isas-"follows: The exhaust steam flowing through vthe conduit a raises the check valve '12 and holds it open so long as the press-ure-of said exhaust steam is above that of the atmosphere, the lower end of the rod 1st serving at the same time to limit the upward move-. ment of the valve. If, however, the exhaust steam falls below atmospheric pressure, the check valve is immediately closed by the piston 13, and thus prevents any suction of air into the turbine casing, or any robbery of live steam coming fromthe first stage into the chamber '21 from which it should properly flow to the second stage wheel.

In case the load on the turbine is suddenly reduced so that the machine begins to race,

16 and permits tneham'mer to shut the valve 12 forcibly and hold it closed. This cuts 01f the supply of exhaust steam. At l he same time the mechanism 18 which trips the latch also releases the quick-closing valve 19, which shuts off the live steam. The tarbine-istlws prevented from racing, and will not operate until the engineer raises the hammer rod 14 and opens the valve 19. In accordancewith. the provisions of the patent 'statutes,-I have described the principle of operation ofmy invention, together with the apparatus which I- now consider to represent-thebest embodiment thereof; but I desire to have it understood that the apparatus shown'is only illustrative, and. that the invention can be carried out by other ans- 'WhatI claim as newand desire to secure by Let ter-'s Patent of the United States is,

1, The combination with a turbine supplied with, steam from a suitablev source, of a valve for shutting-01f the supply, a hammer adapted to-close and hold said valve closedagalnst thepressure of the supply, and an emergency governor for said turbine adapted to release said hammer.

2; The combination with a turbine sup plied with low pressure steam from a suit-,

= a'ble'sonrce,' of avalve for shutting off said supply, aspring-actuated rod in line with .said'valve, a latch locking said rod in anin= operative position, and an emergency governor for tripping said latch.

3. The combination with a turbine supplied with'live steam and also with exhaust Isteam, of a quick-closing valve in the live steam pipe, a' check valve in the exhaust steam conduit, an emergency governor, and

. s'upply conduit adapted to be closed auto-' matic'a'lly by atmospheric pressure when the steam pressure falls below that of the atmosphere, and'means for automatically closing said valve when the turbine races com-- prising a spring actuated rod arranged in line with the valve, a latch that normally holds the rod out of engagement with the to be closed automatically by atmospheric pressure when the pressure of the low pressure steam falls below atmospheric.

6'. In combination, a turbine, a conduit supplying high pressure steam to the initial stage or region of the turbine, a conduit for supplying low pressure steam to a region of lower pressure in the turbine, a valve for regulating the admission of steam from the high pressure conduit to the turbine, a valve for regulating the admission I of steam from the low pressure conduit to the turbine, a governing mechanism for controlling said valves, ancl a valve in the low pressure conduit adapted to be closed automatically by atmospheric pressure when the pressure of the low pressure steam falls below atmospheric.v

7. The combination with a turbine supplied with high pressure and also with low pressure steam, of a valve in the high pressure supply pipe, a valve in the low pressure supply pipe adapted to be closed automaticallyby atmospheric pressure when the steam pressure falls below that of the atmosphere, an emergency governor, and connections between the governor and said valves that effect the closing of both valves when the turbine races.

Inwitness whereof, I have hereunto set my hand this 11th day of September, 1909.

' WVALTER KIESER.

l/Vitnesses s LUnwIG CiiBELIe, OSKAR DAHLKE.

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