US1759218A - Exhaust-steam injector - Google Patents

Description

May 20, 1930; E. BLAUHORN EXHAUST STEAM INJECTOR Filed Sept. 22. 1927 fmflde/ fi/aafiarp I N VEN TOR.

ATTORNEY.

Patented May 20, 1930 UNITED STATES EMANUEL IBLAUI-IORN,

or VIENNA, AUstrnIA EXHAUST-STEAM INJECTOR Application filed September 22, 1927, Serial No. 221,381, and in Austria February 5, 1927."

The subject of this invention is a modification of the exhaust steam injector described in the application for United States patent, filed by Hans Deutsch, September 15, 1927,

under Serial Number 219,7 39, having an annular nozzle fed with live steam and enclosing the exhaust steam nozzle.

The arrangement there disclosed has the disadvantage, particularly with smaller sizes, that the annular space between the exhaust steam nozzle and the annular nozzle is rapidly worn out by the action of the steam flowing through this narrow section, the function of the apparatus being thereby injured as the exact cross-sectional area is important. The present invention therefore has the object of providing a form of the apparatus in which thisdifliculty is removed.

The underlying thought is to permit the an- 0 nular nozzle to function only at those periods at which it performs its principal purpose, which is to ensure starting of the injector even after air or certain amounts of steam have entered through the exhaust steam connections; while at. all other periods while the injector is in operation the entrance of steam to the nozzle is prevented, so that even when no exhaust steam is present the live steam replacing it reaches the injector only through the ordinary path but not through the lifting nozzle.

As the periods of time in which the lifting nozzle is in action will thus be only very brief, the wear on the cross-sectional area will be so small even without taking any particular precautions that it may be disregarded.

This inventive idea is most advantageously carried out by giving a suitable form to the arrangement which regulates the admission of the auxiliary live steam to the injector. The form given to this arrangement is such that the admission of the auxiliary live steam to the lifting nozzle and to the exhaust steam space can occur only alternately, in such a way that each time the valve is manipulated the live steam path to the lifting nozzle is first opened and then this path is simultaneously closed off while the path for the live steam into the exhaust steam space is opened so that the lifting of the feed water is always first assured in the manner described below when the injector is changed over from exhaust steam operation to operation with expanded live' steam.

The drawings illustrate the subject-matter of the invention appliedto an injector of the general type disclosed in UnitedStates Patents Nos. 944,455 and 1,342,128 granted De 69' T cember 28, 1909 and June 1, 1920 respectively, to J. C. Metcalfe, et "al., modified to in V clude the lifting feature disclosed in the Deutsch application referred to. It is to be understood, however, that the present invention may also be applied to exhaust steam injectors, the specific details of which difier from'those disclosed in the Metcalfe patents. Fig. 1 is a diagrammatic view of'an injector and control valve assembly in which the pres: 70

ent invention is incorporated, while Figs i 2 and 3 are enlarged details ofanillustrative form ofthe control valveembodying the invention in its two'main positions.

In the injector'shown in Fig. 1 the nozzle 8, fed from the steam space 3 to which exhaust steam is admitted through valve 3 ,issur-f rounded by the annular nozzle 9 which acts on the Water space 4 the latter being supplied from the Water pipe 19. Thisnozzle is sup, plied with live steam by its own supply pipe, 20 while the auxiliary live steam is carried" to the exhaust steam space 3 through the passage 18. I p 1 F The valve, however, which controls the steam path to the passages 18 and 20, is provided with an extension in the form of a hollow piston or. whose wall is provided with openings 6, b and 0, 0 of which the openings 0, c communicate with the path 20 when the valve 16 is in its lowest position, while the openings 6, b communicate with the path 18 when the valve is opened. In the latter position the openings 0, 0 are closed.

Fig. 2 shows the position of this controlling valve when the valve 16 is just beginning to open. Steam flows through the passage 2, 7 under the seat of the valve into the hollow A piston to the openings 0, 0 and through these into the steam path 20 whence it reaches the PAT N canoe f lifting nozzle 9. This current of steam then lifts the water which reaches the water space 4 of theinjector through the water pipe 19. With a further opening of the valve 16 the piston assumes the position of Fig. 3 in which the flow of steam to the liftingnozzle ceases and the way is opened through pipe 18 to the ex- I haust steam space 310i the injector, where this expanded auxiliary live steam, replacing the exhaust steam, assures the action of the injector in the ordinary way in connection with the live steam flowing through thenozzle 7.

The form of the controllingvalve herein illustratedhas the advantage that it controls with a single apparatus not only the opening of the live steam path itself, but also several other pathsin theproper order and in addi tion makesit possible by the proper dimensio ning of the openings in the wall of: the

V 2o vnve m secure the required throttling down of the steam 'for each of the passages. Through this co-action of the solid valve and its sleeve portion, it now becomes unnecessary to pack the latter so that the construction is very simple. I V

I claim: I v r v 1. In an injector of the class described, the combination of amai-n low pressure steam nozzle, a steam space communicating therewith, a high pressure lifting nozzle surroundingsaid mainnozzle, conduits to supply said steam space and said lifting nozzlewith live steam, and valve means for admitting live steam to said conduits in alternation only. 2.; A combination according to claim 1, the

valve means being so arranged that the flow through the conduit to'thehigh pressure lifting n'oz live steam. Y, 7 v

3. A combination according to claim 1, the

, valve means comprising a disc to close the entranceto both conduits, and a hollow piston with openings to admit steam to its interior and to permit flow from its interior-to the two conduits.

A combination according to claim 1, the valve means comprising a hollow piston with an opening to admit steam to its interior and openings to permit flow from'its interior to the two conduits, the latter openings being of such dimensions as to throttle the live steam down by the required amount.

7 EMANUEL BLAUHORN.

zle is alwaysopened first on admitting

Images