US1768321A - Sche heissdampp-gesellschapt m - Google Patents

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Julie 24, 1930. R 0, RTM N I l,768,321 APPARQTUS FOR CONTROLLIKG THE WORKING STEAM IN BIG; PRESSURE LOCOMOTIVES Filed Oct. 27, 1928 Patented June 24, 1930 UNITED STATES ATENT OFFICE OTTO H. HARTllllANN, OF CASSEL-WILHELMSHOHE, GERMANY, ASSIGNOR TO SCHMIDT- SCHE HEISSDAMPF-GESELLSCHAFT M. B. H., OF CASSEL-WILHELMSHOHE, GER- MANY, A CORPORATION OF GERMANY APPARATUS FOR CONTROLLING THE WORKING STEAM IN HIGH-PRESSURE LOCOMOTIVES Application filed October 27, 1928, Serial No. 315,559, and in Germany August 17, 1 928.

My'invention relates to the control of the working steam in high-pressure locomotives in which superheated live steam from the high-pressure boiler serves as heating steam for the interstage superheating of low-pressure steam and is then re-superheated before admission into the high-pressure cylinder or cylinders.

The exhaust steam from the high-pressure cylinder or cylinders after passing through the interstage superheater, is admitted into the re-superheater for the high-pressure steam must be arranged between the fire box and the smoke-tube feed-water heater, and are therefore exposed to the danger of overheating when the locomotive is heating up or when steam is shut 0E and the blast pipe working.

In order to avoid this danger, according to the present invention a flow-over valve which can be operated from the cab of the locomotive, is arranged between the superheaters and the high-pressure throttle valve in the pipe supplying high-pressure steam to the engine, thus rendering it possible, when the high-pressure throttle is closed, to pass high-pressure steam into the water space of the smoke-tube heater boiler;

In this way it is possible for the driver, when the locomotive is heating up or stopped, to pass high-pressure steam through the superheaters into the heater boiler and so to protect the superheaters against overheating, while at the same time the heating up of the heater boiler is accelerated.

In order to allow the steam generated in the heater boiler to pass into or be shut ofi fromthe interstage superheater as soon as it has reached a pressure equal to that of the exhaust from t e high-pressure cylinder, a valve under the control of the driver in the cab is arranged in a pipe leading from the low-pressure boiler to the exhaust pipe of the high-pressure cylinder.

lhe accompanying drawing shows diagrammatically one construction of boiler and steam connections for a high-pressure locomotive according to the present invention.

In the drawing, the watertube boiler, 1, serves as the fire box and also forms the flue leading thence to the smoke-tube boiler. Among the water tubes lie the pro-superheater, 2, and the re-superheater, 5, for the high-pressure steam which passes through the heating tube system, 4, of the interstage superheater, 3, for the low-pressure steam.

All the feed water for the high-pressure boiler passes through-the smoke-tube heater boiler, 63, which at higher loads delivers low-pressure steam to the engine at a pressure equal to that of the exhaust from the high-pressure cylinder or cylinders, 7, and

at lower loads serves merely as a feed-water According to the present invention, at a point of thepipe, 19, between the re-superheater, 5, and the valve, 10, a flow-over pipe, 25, is branched oil' in which is arranged a flow-over valve, 14, operable from the cab of the locomotive.

The exhaust steamfrom the high-presj sure cylinder flows through a pipe, 12, into the interstage superheater,'3, and thence by way of the low-pressure throttle valve, 11, through the pipe, 23, into the low-pressure to the heater boiler.

5 stage superheater, 3, is arranged a mixing chamber, 21, from which a connecting pi e,

22, passes into the steam space of the smo etube heater-boiler, 6, a valve, 13, also operable from the cab being. inserted in the pipe, 22.

Any suitable means for operating the valves,13, may be used .such as a lever pro-' vided for the purpose, or a ain the operation of the valvem'ay be ma e to depend on that of the valve gear (not'shown) the lever' i of the latter being connected to the valve by any suitable form of transmission either directly or indirectly by help of steam-or compressed air.-

terstage superheater is necessary only to prevent the locomotive not stopping quickly on'account of exhaust steam expanding 1n the interstage superheater when high-p ressure steam to the engines is shut oif by the throttle valve, 10, and the valve, 13, closed. In cases where this point is of no particular importance, the low-pressure throttle valve. 11, can be omitted. y

In the form of the invention described, the pre-superheaterand the resuperheater for the high-pressure steam lie one above the other, that is to say in parallel as ,regards the flow of furnace gases. The arrangement may, however, be modified so that the two superheaters extend across the full depth of the flue and lie one behind the other. i

superheaters, in spite of the high-temperature zone in which they are placed, are sufficiently protected from over-heating on the one hand by the steam passing through them, andonthe other hand, by the cooling efiect 6f the water tubes of'the 'high-pressure boileramongwhich the are placed. When the engine is stopped or heating up, such a cooling efl'ect from the water tubes of the high-pressure boiler will not afford sufficient protection. -By 0 ening the flowover valve, 14, in front of the high-pressure 'throttle valve, 10, however, the dr1ver .can allow high-pressure steam in this or any other case to pass through both superheaters 3 WhatIclaimis: 1. In an apparatus for controlling the working steam in high-pressure locomotives with interstage superheating wherein steam is suppliedto the high pressure and the low pressure c linder of an engine, the comb ina-' tion of a 'gh-pr'essure steam boiler, a pres superheater connected. to said high pressure boiler, a heated interstage super- When the locomotive is running, the two v heater provided with a heating tube system' connected to said pre-superheater, a re-s'uperheater connected to said interstage supereater, a low-pressure smoke-tube feedwater-heater boiler, disposed beyond the said 'pre-superheater and re-superheater m the ftath'of the furnace gases, a high-pressure 1t rottle valve, being arranged in a condult beyond the saidre-superheater, a flow-over-v valve operable from the cab and-being disposed in the steam conduit between the said "re-superheater and, the said high-pressure throttle, and a steam conduit vleadingfrom the flow over valve to the water space of the said feed-water-heater boiler.

2. In an apparatus for controlling .the working steam in high-pressure locomotives ,with interstage super-heating. wherein the steam is supplied to the high pressure and In view of the control valve, 13, theeoW- pressure throttle valve, 11, beyond the; in-' the low pressure cylinder of an engine, the

- combination of a high-pressure steam boiler,

water-heater boiler, disposed beyond the said pre-superheater and re-superheaters in the path of the furnade gases, a high-pressure throttle valve, being arranged in a conduit beyond the said re-superheater a flow-over valve operable from the cab and being disposed in the steam conduit between the said re-superheater and the said high-pressure throttle, a steam conduit leading from the flow over valve to the water space of the said feed-water-heater boiler, a mixing chamber ada ted to mix the-exhaust steam from the high developed in the said feed-water-heater boiler, and a valve operable from the cab and adapted to control the passage of steam' from the said feed-water-heating boiler to the said mixing chamber, substantially as set forth.

3. In an apparatus for controlling the worln'ng steam in high-pressure locomotives with interstage superheating wherein the steam is supplied to the high pressure and the low pressure cylinder of an engine, the combination of a high-pressure steam boiler, a pre-superhe'ater connected to said high pressure boiler, a steam heated interstage' superheater provided with a heating tube system connected to said pre-superheater, a re-superheater connected with said interstage superheater,- a low-pressure smoketube-fe'ed-water-heater ,boiler disposed be- -pressure cylinder with steamyond' the. said pre-silperheater and re-superheaters in the path of the furnace gases, a,high-pressure throttle valve being arranged in. a conduit beyond the said re-supereheater, a flow-over. valve' operable from the cab and being disposed in the steam conduit between the said re-superheater and the said high-pressure throttle, a steam conduit leading from the flow over valve to the water space of the said feed- Water-heater boiler, a mixing chamber adapted to mix the exhaust steam from the high-pressure cylinder with steam developed in the said feed-Water-heater boiler, a valve operable from the cab and adapted to control the passage of steam from the said feed-Water-heating boiler to the said mixing chamber and a low-pressure steam throttle disposed in the steam conduit from the interstage superheater to the low-pressure cylinder, substantially as set forth.

In testimony whereof I have afiixed my signature.

- OTTO H. HARTMANN.

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