US1574798A

US1574798A - Steam injector with automatic shifting valve

Info

Publication number: US1574798A
Application number: US7898A
Authority: US
Inventors: Deutsch Hans
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-02-09
Filing date: 1925-02-09
Publication date: 1926-03-02
Anticipated expiration: 1943-03-02

Description

March Z 1926. 15574398 H. DEUTSCH STEAM INJECTOlR WITH AUTOMATIC SHIFTNG VALVE Original Filed Feb. 9, 1925 INVENTOR afe, WT@

ATTRNEYs i Patented Mar. 2, 1926.

UNITED STATES PATENT OFFICE. l

HANS DEUTSCH, OF VIENNA, AUSTRIA.

` STEAM INJECTOR WITH AUTOMATIC SHIFTING VALVE.

Application tiled-February 9, 1925, Serial'No. 7,898. Renewed November 19, 1925.

To all lwhom it may concern.'

Be 1t known that I, HANS DEUTSCH, a citizen of Austr1a, and resident of Vienna,

`Austria, have invented certain newand useful Improvements in Steam Injectors with Automatic Shifting Valves, of which the following is a specification.

My invention relates to that type of steam injectors for locomotive engines which operate with live steam and exhaust steam While the engine proper is running so that a supply of exhaust .steam is available. If the engine is standing still, or if it is running idle, so that no exhaust steam is produced, an injector of the type requiring both live steam and exhaust steam for its operation would Icease to function under the conditions above referred to, when. the supply of exhaust steam stops. My present invention relates to an improvement in injectors of the type mentioned, and has for its object to insure'the proper operation of such an in- A jector even whenno exhaust steam is being supplied thereto. .In order to accomplish this I provide a special novel arrangement whereby, when the supplyof exhaust steam stops, an additional supply of live steam is brought into action automatically, this additiona live steam being preferably in an expanded condition, that is to say, at a com paratively low pressure, corresponding sub- -stantially to the usual exhaust pressure. In

the preferred form of` my invention, an automatic valve is employed to control the shifting from one mode of operation (live steam combined with exhaust steam) to the other (live steam alone), and said valve is controlled by the pressure in the slide Valve chest, the main steam pipe, or some other part receiving steam when the engine proper is in operation.

'A typical and satisfactory example of my invention is illustrated by the accompanying drawing in longitudinal section.

Exhaust steam is admitted through the inlet 1 while high pressure live steam from the boiler reaches the inner or supplementary live steam nozzle 13 through a steam @conduit 2. A portion of this nozzle is s urrounded by an annular chamber 3 receiving at times steam under a reduced pressure the nozzle 13, and isA directed toward the which in the position illustrated rests` with A its small lower end 7 upon a suitable seat in such a way as to close theientrance to the steam conduit 4. The upper end: 8 of this valve is of larger diameter and is adapted to engage a corresponding upper seat. In the position illustrated, the live steam coming from the boiler through the inlet 10 has access to the auxiliary live steam conduit 2 and also to the upper fa of the valve 6, throu'gh a pressure-redu ing constricted lopening 1'9 which leads into the chamber 20 containing the automatic valve 6. The automatic valve is thus balanced, and is held to its lower seat by gravity. This valve has an upward projection 6 adapted to engage a fluid pressure actuated member 12 located in a chamber 9 which by means of a conduit ll communicates with the slide valve chest, the main steam pipe, or so-me other part in which a high steam pressure prevails while the engine proper is runnin The member 12 which may be of any suita le construction, but which is shown as a valve is adapted, when held to its power position by steam pressure in the chamber 9, to prevent movement of the automatic valve to its upper position. The seating surface at the upper.` end 8 of the valve 6 may be roughened, .or some other expedient may be adopted to produce a joint that will not be quite tight,

so that even when the valve 6 is closed small amounts of steam will leak or. pass from the chamber 20 to the chamber 9a.v Similarly, the seating surface of. valve 12 may be constructed to allow a slight leakage,

yand furthermore, this valve may be moved ofi'y its seat by spring pressure so as to close only when the steam pressure in the chamber '9 exceeds a predetermined amount.

11 with the slide valve.' chest or with Vthe steam pi leading from the throttle valve to the shde valve chest and therefore the gage its lower seat and thus shut olf the admission of live steam from the conduit 10 to the conduit 4. During the injection of feed water, the full boiler pressure will exist at the inlet 10, and small amounts of steam will pass from this inlet through the opening 19 into the chamber 20, and from the latter through the narrow slit at. the upper end of the shifting valve 6 into the` chamber 9a. From this chamber the steam will pass to the chamber 9, the valvel 12 either being slightly olf itsseat, or ifseated, being constructed to .allow leakage, as explained above. The injector under these conditions will operate with live steam flowing through 10, 12, 13 and with exhaust steam {iowing froml 1 to 5.

When the throttle of the locomotive is closed, so that the engine will run Without steam, the pressure in the conduit 11 and chamber 9 will drop to such an extent thatv the velocity ofthe-steam flowing through the linlet 10 to the chamber 9 will be sufficient to lift the automatic valve 6 and bring it against its upper seat, because the upper end 8 o fl said'valve is of larger seating surface than its lower end 7 With the automatic valve 6 in'` its upper position` the'chamber 20vwill be placed in communication with the i auxiliary live steam conduit 4, lso that live steam will pass through the conduit 4 as Well as through the conduit 2. In this case the injector will work with live steam alone,

the 'steam .flowing througlf the conduit 4 havingthe same function as previously performed by the exhaust steam. If, as suggested above, the valve 6 or its upperseat are so constructed as to permit leakage when the valve is seated upwardly, or if other means are provided to obtain a leak or bleeding action, fsmall amounts of steam will pass from the chamber 9 to the chamber 9 andthence throughvthe conduit 11 to the slide valve chest. Such steam iswasted, but

the amount of'waste is sov small as to be immaterial lin its effect on the eiiciency of the It is important to reduce the pressure of the Steam passing through the auxiliary live steam conduit 4, before such' stea reaches the nozzles. Inrthe specific examp e illustrated, this reduction is obtained by throttling the live steam at the opening 19, before such steam reaches the automatic valve controlling the inlet of the conduit 4. Under these conditions, with'the valve lifted against its upper seat, the` pressure in chamber 2O willbe comparatively low,and thus, when the'cngineer again opens the throttle valve, a relatively low pressure in the slide valve chest will suffice to enable the fluid pressure member 12 to press the automatic valve 6 against its lower seat, therebya cutting'olf the supply of steam to the auxiliary live steam conduit 4. i

Various modifications maybe made with out departing fronrthe nature of my invention as set forth in the appended claims.

I claim: e

1. An apparatus of the class described, comprising a valve chamber and means for connecting said chamber with a part containing stcam substantially under boiler pressure only,when the engine is in operation, a valve located "in lsaid chamber and f adapted. to be urged toward its seat-by such pressure, an inlet for high pressure steam,

a nozzle in permanent communication with .said inlet, an inlet for vexhaust steam, a

second nozzle in permanent communication with said exhaust inlet, a conduit for conveying high pressure steam (coming from the high pressure steam inlet to said second nozzle, a second chamber the communication of which with the first named chamber is controlled by said valve, and a shifting valve having seating surfaces of different sizes,

the. larger seating surface controlling the communication of said second chamber with the high pressure steam inlet, While the smaller seatingy surface of said shifting valve controls the communication of said high' pressure steam inlet with the conduit lead-l ing to said second nozzle, whereby the shift-A ing valve will be seated on its larger seating surface whenever the-high pressure 'prevalling at the high pressure steam inlet exceeds.

by a predetermined amount, the'pressure existing in the first mentioned valve chamber,

'connecting said chamber with a part containing steam substantially under boiler pressure only when the engine is in o eration, a valve located in'said chamber an arranged to be seated by said pressure, a shifting v alve having seating surfaces ofdifferent sizes,

the larger seating surface facing the first named valve, and the shifting valve, When seated on such larger seating surface, form-l ing astop for thejirst named valve to prevent the latter from becoming seated, an

lll)

inlet for boiler steam, a nozzle in permanent commumcatlon with said inlet, an 1nlet for exhaust steam, a second nozzle in permanent 'communication with said exhaustinlet, ,and

a/ conduit for .leading live steam to said second nozzle, the communication of said 4 nection for supplying steam under pressure,

a valve in said chamber, arranged to be seated by such pressure, a shifting valve having a relatively large seating surface at one end and a relatively small seatin surface at the other end, the end with the argeiseating surface' beingf directed toward the first named valve, and the shifting valve, when seated with its lai-ger end, formin a stop to prevent the first-named valve rom be- 4 coming seated, an inlet forhigh pressure steam, an injector nozzle in permanent coininunication withsaid inlet, an inlet forexhaust steam, `a second nozzle in permanent communication with said exhaust inlet., and a conduit for leading the high pressure steam to said second nozzle, the communication of said conduit with the high pressure steam inlet being controlled by the small end of said shifting valve, and means whereby the pressure of the steam {iowing from the high pressure inlet to said second nozzle through said conduit will be reduced before such steam reaches this nozzle.

4. An apparatus of the class described, comprising a valve chamber and means for connecting said chamber with a part containing steam substantially under boiler pressure only when the engine is in operaftion, a valve located in said chamber and fr adapted to be urged toward its seat by such pressure, an inlet for high pressure steam, a nozzle in permanent communication with said inlet, an inlet for exhaust steam, a second nozzle in permanent communication l with said exhaust inlet, a conduit for conveying high pressure steam coming from the high pressure steam inlet to said second nozzle, a second chamber the communication of which with the first named chamber is controlled by said valve, and a shifting valve having seating surfaces of diiferent sizes, the larger seating surface controlling the communication of the said second chamber with the high pressure. steam inlet, while the smaller seating surface of said shifting valve controls the communication of said high pressure steam inlet with the conduit leading toV` said second nozzle, whereby the shifting valve will be seated on its larger seating surface whenever the high pressure prevaling at the highpressure\steam inlet exceeds by a predetermined amount, the pressure existing in the first mentionedivalve chamber, thereby admitting high pressure steam to said second nozzle, whereas in the absence of such pressure difference the .shifting valve will shut oli' high pressure steam from said second nozzle, said shifting valve,

steam con uits, a

when seated on its larger seating surface, forming a stop to prevent the first named valve from becoming seated.

5. An apparatus of the class described, comprising a valve chamber having a connection for supplying steam under pressure, a valve in said chamber, arranged to be seated by such pressure, 'a shifting valve having a relatively large seating surface at one end and a relatively small seatin surface at the other end, the end with tie larger seating surface being directed toward the first named'valve, and the shifting valve, when seated with its larger end, forming a stop to prevent the first-named valve from becoming seated, an inlet for high pressure steam, an injector nozzle in permanent communication with said inlet, an inlet for exhaust-steam, a second nozzle in permanent communication with said exhaust inlet, and a conduit for leading the high pressure Steam tosaid second'nozzle, the communication ot' said conduit with the high pressure steam inlet being controlled by the small end of said shifting valve, and means for throttling the high pressure steam on its way 7from the high pressure steam inlet to said conduit, before such steam reaches the shifting valve.

6. The combination with an exhaust steam injector havinl conduits connected therewith for supp ying exhaust steam, supplementary live steam and auxiliary live steam to said injector, of an automatic valve for controllin the admission of live steam to said auxi' iary conduit, and a connection valve being inte osed between said connection and said auxiliary live steam 'conduit to be o erated by the steam passing to said l.

om a source of live steam, said automatic valve being interposed between said eonnection and said'auxiliary live steam conduit to `be operated by the steam passing to said auxiliary conduit, said automatic valve being further provided `with a restricted passageway between said connection and said auxiliary) live steam conduit to throttle the live steam.

8. The combination with an exhaust steam injector havin conduits connected therewith .for supp ying exhaust steam, supple- 'mentary live steam and auxiliary live steam to said injector, of a valve casing having an inlet adapted to be connected to a source'of live steam, and a pair of outlets connected to said su Elementary. and auxiliaryl live ias vfluid pressure actuated no means in said casing connected with a steam line of the engine, and a" valve in co-operative relationship with said. liud pressure means, and movable to either of two posi- 5 tions in one of which it permits'coinlnunication between said inlet and auxiliary live steam conduit, and in the other of which positions, it shuts oft' 4such communication,-

the movement of said valve being automatically accomplished by the steam passing to said auxiliary live steam conduit and being controlled by the position ot' said Huid pressure means.

`9. The combination with an exhaust steam l5 injector having conduits connected therewith for supplying exhaust steam, supplementary live steam and auxiliary live steam -to said injector, of a valve casing having an inlet connected with a source of live steam,

0 and outlets connected to said supplementary l and auxiliary live steam conduits, a valve mounted in said casing. and movable to either of two positions, in one of which it permits the steam to iow to said auxiliary live steam conduit and in the otherprevents such flow, a iuid pressure-actuated means in ]uxtaposition to said valve, and a connection between said fluid. pressure means and a steam line of theengine for causing .the movementof said valve to be automati` cally controlled in accordance with the pressure conditions in said steam line.

.avalve mounted in said casing and movable to either of two positions, in one of which it permits the steam toflow to, said auxiliary -live steau'i conduit, and in the other prevents such lo\v,the pressure of thesteani within said casing fiowing' to said auxiliary conduit normally tending to move said .Valve to'said first named position, a Huid pressure actuated means adjacent to said valve, and a connection from al steam line of the engine to said means for causing said fluid pressure `means to hold said valve in said other posi-l tion when steam under pressure is present in said steam line.

11. A combination as set forth in claim 10,/ in which the valve casing is provided I with a restricted opening between said inlet and the outlet for said auxiliary live steam conduit to throttle thepressure of the live steam passing to said conduit.

In testimony whereof I have hereunto set my hand.

, HANS DEUTSCH f