US1710566A - Steam injector - Google Patents

Description

A ril 23, 1929. BROOKE 1,710,566

STEAM INJECTOR Filed Jan. 15, 1927 2 Sheets-Sheet 2 Inventor 4 fltborneys Patented 23, 1929.

UNITED STATES nonnn'r. enunnx nnooxis, or neccnnsnrntn, Ens-Lani), ass'ienon ro notnnit & sao o'xs, LIMITED, or MANCHESTER, ENGLAND.

- STEAM-INJECTOR; 9

This invention relates to injectors in which use is made of exhaust steam, in some cases the pressure of the exhaust steam ClflftllGS considerably, and may prove inconve n nt.

For instance, on a locomotive,.the pressure of the exhaust in the pipe supplying the nj ector may be anything from Oto say 20 lbs. per square ,inch ormore, above atmosphere and it this variation or" pressure reaches the injector, the latter requires.regulating by hand to meet such variation, thus necessitating care and I attention on the part of the driven.

' One object of the present invention is to regulate: automatically the pressure of l the exhaust steam when entering the injector irrespective of the pressure of the exhaust steam in the supply pipe therefor.

An exhaust injector will work with steam at from 0 to say 7 lbs. pressure without regulation and afurther object of the invention is to provide robust means which will. regulate the pressure in the injector to values Well within this range when the pressure of the exhaust steam in the, supply pipenecessitates vide, :tor the regulation of exhaust steam pressure in an injector, valve means adapted, in cases where live steam replaces exhaust steam for feeding the injector, to prevent escape of live steam, by way of thesupply pipe, for the exhaust steam. I

These and other minor objects will rea appear from the description now about to be given with the aid of the accompanying drawings in which Fig.1 is a side elevation and Fig. 2a plan, each with parts in section, of

1 outside of the casing through a packed gland an attachment to the body of an exhaust injector fitted with the regulating means. Fig. 3 is an elevation at right angles to Fig. 1. i

As here shown the exhaust steam supply pipe 1 is connected to theinjector body 2, to the rear of a valve 3 which separates the pipe 1 from a chamber- 4 at what for convenience may be termed the regulated pressure side of the valve. In the example, a butterfly valve is shown, though a valve of any other suitable balanced type may be, employed. The valve 3 is actuated by an external lever 5 securedto the spindle 6 which is brought to'the 7. To the lever 5 is connecteda tension spring 8'tending normally to hold the v lves open. The tension of this spring 8 can be adjuster in any suitable way such as by turning a nut 9 dily ' upon a screw threaded eye bolt 10. The lever 5 is connected by a link 11 to a piston 12 constituting .vith the'cylinder l3 and aclosure 14, a chamber 15 which communicates with the I exhaust steam chamber lby a passage 16.

.. The injector for use in connection withmy invention is intended .to be equipped with a change-over valve such as is illustrated inthe specification of Letters Patent No. 1,706,346 so that whe'n,'as on a locomotive, the engine is not under steam and there is no exhaust to work the injector, live steam is used to take theplace of the exhaust, the valve rcterred to-automatically establishes the live steam supply as an auxiliary as soon as the exhaust supplystops. llhus whilst 17 represents the passage intended to be connected to the branch 32 of the change-over valve of thesaid earlier application and so conduct live steam to the live steam spindle means supplied through the passage 18,19 similarly represents the passage intended to I be connected to the branch '33 of the'change- I over valve wherebylive steam. is, when de--, I

the chamber 15 as and for the purpose to be hereinafter described.

Broadly the action is as follows -Assuming exhaust steam to be available and the valve 3 to be open, then a portion of such ex haust steam will pass from the pipe 1 to chamher 4, and thence by passage 16 to chamber 15,

' opening the valve 20 if employed. As the:

, pressure in chamber ttends 'to-rise'so will it also tend to rise in chamber 15where, acting I uponthe piston 12, it tends to overcome the,

pull of thespring 8 thereby gradually close.

the rise in it due to increasing pressure in the pipe 1 will be limited so as to obviate independent regulation of the injector.

.lustrated, live'steam'is introduced at 19 as an auxiliary to exhaust steam when the latter is not available, a portion of such live steam is at the same time conducted through passage When, as inthe more specific example il- 21 directly into the chan'iber 15. This steain being unable, because of valve 20, to find its way out of the chamber 15 acts on the piston 12 in such a manner as to close the valve 3 to the fullest extent possible thus pernnttmg no or next to no steam to pass from chaniber 1 to the p1 pc 1. It is of course understood that the live steam supplied to the chainber 4t an auxiliary source is reduced to the quantity oi pressure required, no regulation being necessary. V

' What I 01211111 is 1. An attachment for exhaust steam injectors colnprlsnig, 1n co1nb1nat1on with a rotary valve controlling the steam inlet, spring-- actuated means external to the injector body or casing connecting said valve with a fixture on said casing and tending to hold said valve open, and steam-actuated ineans exter nal to said casing tending to close said valve in opposition to the spring; said stean1-actuated means comprising a cylinder attached to said caslng, a piston 1n sald cyhnder, a steam inlet passage leading from the interior of the cas1ng into said cylinder, and connections between said plston and valve whereby the latter is adapted to close when the pressure with-' i in the casing increases and-to open when the pressure decreases.

2. An attachment for exhaust steam inj ectors comprising a rotary valve controlling the steam'inlet; said valve being fixed on a shaft having an upstanding arm or lever on the outside of the casing, a spring connecting said lever-with a fixture on the outer side of the asing and by its pull tending to open said valve, and steam-actuated means tending to close said valve in opposition to the spring;

said steam-actuated means comprising a cyl irrespective of the pressure of the exhaust steam supply therefor. v

Signed. at Manchester, England, this third day of January, 1927.

ROBERT GRUNDY BROOKE

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