US1546712A - Injector - Google Patents

Description

Jul 21, 192.5. 1,546,712.

R. G., BROOKE INJECTOR Filed July 12, 1925 7 sheets-sheet 1 o is? W o gg July 21,. 1925,

R. G. BROOKE INJECTOR Fil ed July 12, 1925 7 Sheets-Sheet 2 w W QM? M July 21, 1925. 1,546,712

R. G. BROOKE INJECTOR Filed July 12, 1923 v 7 Sheec-Sheer, 5

R. G. BROOKE July 21, 1925.

INJECTOR Filed July 12, 1923 7 ShQECS-Sht 4.

July'21, 1925.

G. BROOKE INJECTOR Filed July l2, 1923 Shee'ts-Sheet 5 LI Lmi A g q 27? i 3 39 '2! K 4. v y I v mam M (L F July 21, 1925. 1,546,712

R. G. BROQKE INJECTOR Filed July 12, 1925 '7 Sheets-Sheet v Patented July 21, 1925.

v 1,546,712 UNITED STATES; PATENT OFFlCE.

ROBERT GBUNDY BROOKE, 0F MAGGI ESFIELD, ENGLAND.

rat moron. 7

Application filed July 12, 1923. Serial No. 651,096.

tending to facilitate the starting or restarting of such apparatus. The said improvements are directed to the means for properly supplying both steam and water to the injector. i

According to the invention, it is arranged that the organs employed in securing the low of steam and water shall respond in predetermined manner to the'Inanip-ulation oil a single controlling member, whlchre sponse however can initially be varied by appropriate adjustment oil the parts.

The way in which the invention can be best carried into effect will depend, as to details, upon the type of injector under con side-ration and also upon the degre of directness of control desired, it being perhaps deem-ed desirable in somecases tocause the water valve to be opened indirectly by fluid; under pressure during the act ot manipulating the steam valve and; in other cases to mechanically interconnect the steam and water valves, with lost motion. 7

In the accompanying drawings, Fig. 1 is a vertical longitudinal section of one construction of injector embodying im n'ovements according tothe invention. is a plan the-root. Fig. 35 is an elevation with parts in section on the line 3 3 Fig. 2. Fig. 4 is an end elevation looking at Fig. 1' troin the right and Fig. 5 is a similar endelevation looking from the left. Fig. 6 is a horizontal section corresponding to the line 6--6' of Fig. 1.. Fig. (3 is a more or less diagrammatic view to a larger scale o l"? a portion of Fig. that is to saycompris ng sections which although normally occupying planes perpendicular to one another in said Fig. are assumed in- Fig. 6 to occupy the same plane. Figs. W and 6 are fragmentary views] illustrating parts of Fig. 3' 1n other positions. Figs. 'Z and 8- are' vertical sections Fig. 2

of two modified forms of water valve for such an injector. Fig. 9 is a vertical section of a modified form of overflow valve for such an injector. Fig. 10 is a view, partly in elevation and partly in section, of a water branch with valve and a live steam valve mechanically interconnected in accordance with the invention. Fig. 11 is a section on the line II II of Fig. 10.

Referring first to Figs. 1 to 6, a is the body of the injector having an exhaust steam branch 6 controlled by a valve c pivoted at (if and adapted to engage an adjustable limit ing stop 6 upon a spindle which can be operated by a lever f 9 is the exhaust steam cone adjustable, by the eccentric end it of a vertical regulating spindle 13 fitted. with an indicator pointer j, the operating handle not being shown. A; is the live steam nozzle attached to the internal branch m, and n is the delivery valve, these and the re maining parts of the injector proper being all substantially as usual. The water inlet valve 0, is, in the present case, of the lift type, adapted to moved to'the open position shown in Fig. 1, oil. a seat p in the water branch Q against the opposing head of water and, it may be, the action of a spring 1, by the pressure of steam exerted either directly upon a piston s associated with the water valve or indirectly upon water in contact A with such piston, in or during the act oi opening the live steam valve. Fluid tightness, to prevent leakage along the pistons when the water valve 0 is open, may be secured by means of a valve 6 upon the said piston. The piston chamber u is suitably connected by pipe o to a space w within the live steam valve body which it enters by way of a boss w; j

The steam valve 1 used to admit live steam through the branch 2 to the stationary cone 7: is so constituted as to first admit a portion of the steam to the water valve operating piston s, the steam supply to the cone 7.) only being established after the steam valve has been opened to a wider degree. This may be effected with the aid of a hollow steam valve prolongation 12 of uniform e terual cross section, for at least some portion of its length, thesaid portion fitting snugly and working in a companion member 13, see Figs. 3 and (3, which partially bounds the space to aforesaid. ll hen the steam valve 12"is closed as shown, the piston chainher a associated with the water valve 0 can be placed in communication through a passageway or ways 14 in the steam valve prolongation 12 with the passage on leading to the steam cone is and so to the overflow outlet 15, or into the injector itself, or elsewhere thereby forming a relief or leakage passage when the steam valve 3 is shut and prevent retention of pressure in the water valve piston chamber it which would debar or hinder the water valve 0 shutting.

lVhen such a steam valve g is first partially opened, the relief passageway referred to will place live steam in communication with the injector cone 7s assuming relief is effected through the latter, but the amount of steam which thus escapes will not be suflicent to cause trouble such as by producing a false start in the injector.

Live steam is only fully admitted to the cone is when the valve y is fully retracted to cause the prolongation 12 to leave the member 13, the valve movement being controlled in any suitable way such as by means of a lever 16.

The overflow from chamber 15 conveniently takes place by way of a valve 17 which is brought into and out of engagement with its seat 18 in a branch 19 under the action of or aided by pistons 20, 21 eX- posed respectively to the pressure of live steam entering the injector at and that of liquid at the delivery chamber. To this end the chamber 22 for piston 20 is shown as connected at 23 by a pipe 24- to the steam space 25 of the casing of the live steam valve y which space it enters by way of a boss 26, whilst the chamber 27 of piston 21 is connected at 28 by a pipe 29 to the de livery chamber 30 of the injector vhich it enters at the boss 31. According to the present invention it is arranged that the said pistons 20, 21 shall be capable of greater freedom of movement than heretofore but without leakage when in extreme positions.

Thus the invention provides for the fitting to or association with one or other or each of the pistons aforesaid, of a leakage preventing device 31 being a valve-like washer upon the piston 20 and a valvelike washer upon piston 21. To avoid the well known difliculty that arises of securing tightness of two valves on a common spindle, the valve 32 on the end of the piston 21 which is subject to the delivery pressure may be made of flexible material such as leather or equivalent so that should the parts so fit that the overflow valve 17 closes before the flexible washer 32 engages its seat, that is to say as shown in Fig. 6 the said washer 32 will follow up under the fluid pressure and engage its seat, as indicated in F 6. Alternatively if the fit of the parts should be such that the washer 32 engages its seat before the valve 17 is seated such washer will yield in relation to its seat as indicated in Fig. 6. In each case fluid tightness is secured and the piston is yet freeto exert the requisite pressure on the rigid overflow valve.

Briefly the action of the injector may be thus described. When exhaust steam has entered the injector, the steam valve 7 is slightly opened and pressure admitted by pipe o to the piston s of the water valve 0 which it opens, the overflow valve 17 being already open by pressure acting on the piston 20 through the pipe connection 24:. On the steam valve y being further opened live steam is admitted to the cone is and the injector then commences to work, whereupon pressure from the delivery chamber 30 acts through the pipe connection 29 upon the piston 21 of the overflow valve 17 to close the same.

As will be obvious the water branch 9 might be reversed in position so that what is at present the inlet will become the outlet and vice versa, in which case the spring r will be employed to close the valve against the head of water, but its function in other respects will remain the same.

Similarly, although the water valve 0 is shown as adapted to be opened by a piston s, the latter may be replaced by a diaphragm 33 as in Fig. 7. If desired, the space 3 1 beyond the diaphragm may be provided with a leak hole 85. An alternative diaphragm arrangement is illustrated in Fig. 8, the pressure connection '0 being made to the space 36 and the space 37 being provided with a relief passage 38. In this case the valve 0 is pulled off its seat instead of being pushed.

Fig. 9 illustrates a modification of the overflow valve 17 the piston 21 employed to close the valve being attached to an actuating diaphragm 39, delivery pressure being conducted thereto at 28". V

The water valve in lieu of being of the lift type may be of other forms such as a plug cook 40 as shown in Figs. 10 and 11 and in lieu of being operated indirectly in ways such as referred to, it can be operated for instance, also as shown in said figures, directly by a lever 41 pivoted at 4:2 and having a lost motion connection 41-3 with the stem 44L of alive steam valve 45, which however only illustrates one mechanical arrangement, since it is obvious that the same result can be obtained in other ways.

The details of construction may be varied in minor ways without departing from the scope of the invention.

What I claim is 1. An injector comprising a set of exhaust and supplementary high pressure live steam cones, a water valve, a piston asso ciated with the water valve, a high pressure live steam valve through which steam passes to the injector, a single controlling open the water valve before the steam valve iii.

is fully opened.

3. In an injector, a water valve, a live steam valve, means responsive to fluid pressure adapted to open the water valve, and means whereby live steam is-conducted to said water valve operating means by the steam valve aforesaid before it is moved to full open position.

4. In an injector, a live steam supply chamber, a steam valve, a water valve, means for opening the water valve in the act of opening the steam, valve but before fully opening the latter, an overflow valve and means whereby steam from the said steam supply chamber is caused to open the overflow and hold it open during the formation of the working jet.

5. In an injector a live steam supply chamber, a steam valve, a water valve, means or opening the water valve in the act of opening the steam valve but before fully open ing the latter, an overflow valve, means whereby steam from the said steam supply chamber is caused to open the overflow valve and hold it open during the formation of the working jet and means whereby the overflow valve is closed automatically by pressure from the delivery of the injector after the jet is formed.

6. In an injector, a water valve, means responsive to steam pressure adapted to open said valve, a steam valve, a prolongation upon said valve, a companion member in Which the prolongation is a sliding fit, said member being enlarged adjacent the valve to produce a space adapted to be opened and closed by the latter, and a hollow connection between the said space and water valve opening means aforesaid, to which lattermeans steam is thus conducted when the valve is open.

7. In an injector, a water valve, means responsive to steam pressure adapted to open said valve, a steam valve, a prolongation upon said valve, a companion member in which the prolongation is a sliding fit, said prolongation being hollow and laterally ported and the companion member being enlarged adjacent to the valve to produce a space adapted to be opened and closed b y the latter and a hollow connection between the said space and Water valve opening means aforesaid, the said connection being in communication with a relief region through the lateral port in the valve prolongation when the valve is closed and steam being conducted from the supply to the water valve opening means through such connect-ion when the steam valve is open.

8. In an injector, an overflow valve, freely movable pressure responsive means adapted to close the valve, freely movable pressure respo-nsiye means adapted to open the valve and a leakage preventing valve associated with one of said means.

9. In an injector, an overflow valve, a

freely movable piston responsive to fluid pressure, attached to said valve and adapted to close the latter, and a flexible leakage preventing valve also connected to the overflow valve, said flexible valve, should the overflow valve close first, being adapted to follow up and engage its seat under the fluid pressure employed to close the overflow valve, or alternatively to yield in relation to its seat with continued movement of the overflow valve.

10. In an injector, an overflow valve, a freely movable piston responsive to fluid pressure, attached to said valve and adapted to close the latter, a freely movable piston responsive to fluid pressure, attached to the overflow valve and adapted to open the same, and a leakage preventing valve associated with each of said pistons.

11..In an injector, an overflow valve, a freely movable piston responsive to fluid pressure, attached to said valve and adapted to close the latter, a freely movable piston responsive tofluid pressure, attached to the overflow valve and adapted to open the same, and a leakage preventing valve associated with each of said pistons, the leak age preventing valve that acts to close the overflow valve being of a yielding character.

Signed at London, England this 28th day of June 1923.

ROBERT GRUNDY BROOKE.

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