US275063A - mcelroy - Google Patents

Description

(Modem 3 Sheets-Sheefi 2.

W. MQELROY.

FEED WATER INJECTOR. No. 275,063. Patented'Apr.3,1883.

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WILLIAM MGELROY, OF BROOKLYN, NEW YORK.

FEED-WATER INJECTOR.

SPECIFICATION forming part of Letters .Patent No. 275,063, dated April 3, 1883.

I Applicationfiled July 13,1882. (Modem To all whom it may concern: passes out of chamber B, and it will readily be Be it known that 1, WILLIAM MGELROY, a seen that when the float D plays up and down citizen of the United States, residing at Brookwith the rise and fall of the water in G the shaft lyn, Kings county, New York, have invented F will be rocked or oscillated through the me- 5 certain Improvements in Feed-Water Injectdium of the arm 6.

ors, of which the following is a specification. The water is fed from the injector through This invention relates to an injector for feeda pipe, K, into chamber B, and passes thence ing water to steam-generators, arranged to be through a pipe, L, to the generator below the automatically controlled in its operation by a water-line. Thus the chambers B and C be- 10 float, whereby the admission of steam to the come substantially a part ofthe generator, and injector is proportioned to the altitude of the there is open communication between the two water-level in the generator, and whereby the around the float.

steam is entirelycut ofl'from the injector when The injector proper, A, does not dili'er matea the water-level has risen to-the predetermined rially from the ordinary injectors now in use in I5 altitude. its functions and internalstructure, except in So far asIam aware, all injectors heretofore respect to those parts which are modified to have been controlled by hand only, and it was suit it to my purposes. Its base h is mounted necessary to keep up a vigilant inspection of on or fixed to the chamber B, and on this base the water-gage in order to maintain the water is mounted the outer shell, 0', in which is the 20 at the proper level. My injector entirely obfeed-water inletj. (last with the 'shellt' is the viates this difiiculty, being automatic in its inner pendentcasing,k,into which are screwed action, and arranged to inject the feed-water the parts I l, forming the exterior cone. These only when needed. parts are all fixedin place, and are constructed In the drawings which serve to illustrate similar to the like parts in ordinary inject 25 my invention, Figure l is a vertical section ors. In my injector, however, 7 the interior taken substantially on lines 1 1 in Fig. 2. Fig. spindle orcone, m, and its exterior tubular shell, 2 is a plan. Fig. 3 is a horizontal section taken a, are fixed together, but are arranged to play on line 3 3 in Fig. 1. Figs. 4, 5, and 6 illusup and down through apacked bearingin the trate modifications which will be referred to base h, whereby the faces of the interior and 0 more particularly hereinafter. exterior cones may be brought more or less A represents the injector proper, taken as a nearly together, and the annular space 0 bewhole; B, a waterchamber, and O a floattween them be reduced or enlarged. The chamber. The float D is mounted to play up steam from pipe I enters an annular channel, and down in the float-chamber, being guided p,'in the base It, around the cylindrical tubular I 35 on ribs a a. shell 12, and passes through said shell at aper- E is the stem of the float, which is screwed tures or ports q when the latter coincide or into the latter at b. The stem E has a ballregister with the said channelp; but when the coupling in it at c, and its lower extremity, d, connected parts m and n are pushed upward is coupled to an arm, e, on a rock-shaft, F. these ports are gradually out ofl' and the ad- 40 The steam-space in the generator G is conmission of steam checked and eventually nected with the float-chamber by a pipe, H, stopped entirely. The upper extremity of the which may be controlled by a cock, as shown. spindle m is guided in its movements by a I is a steam-pipe leading from the floatwinged cross-head, 1', and the water-outlet is 5 chamber to the injector; and J is an ordinary controlled byadouble check-valve. The main 4 5 relief-valve, mounted on the stem E, and archeck-valve s closes down upon a seat, 8, and ranged to cut off the passage of steam to the the lesser supplementary check-valve t seats injector by the seating of said valve on its seat itself inside of the valve 8. When the supf when the water in the boiler has raised the ply of steam to the injector is reduced by the float to its greatest altitude. This valve is a rising of the float the lesser check-valve only 5o precautionary device in the main, and its funcwill be lifted, and this will afford egress suiiitions will be explained more fully hereinafter. cient for the limited amount of water passing. The rock-shaft F is packed at y, where it The moving parts on and n of the injector proper are coupled by a link, a, with a short arm, a, on the exterior extremity of shaft F, an adjustable coupling, a, being employed to effect the proper adjustment of the said parts on and a, with respect to the float. The latter may also be adjusted by the following-described means,

On the top of the float-chamber is a stufflngbox, to, through which passes a key, M, provided with a hand wheel or crank. In the lower end of this key is a socket, which, when the key is pressed down, takes over a square on the upper end of the float stem E. By turning the key the stem is turned'and the float I) run up or down, as required. The

ball-coupling at 0 permits rod E to turn freely without afl'ecting thejoint to the arm 0.

So far as described the operation is as follows: The float is set in such a position as to cut off the steam to the injector when the water has risen in the generator to the desired level or altitude. WVhen the water stands at this level the ports q of the injector will be raised above the steam-inlet p and the injector will cease to operate. When the water falls in the generator the float will also fall, and, operating through the arm 0, rock-shaft F, and arm o,.will draw down the parts on and n and bring the ports (1 opposite the steam-inletp. This will set the injector in operation to supply the deficiency of water in the generator, and the float will again be raised to cut off the steam. It will be observed, also, that, as the ports q are gradually closed and the amount of steam entering thereat is gradually diminished, the rising of the spindle m gradually diminishes the width of the annular space 0 around said spindle, thus proportioning the passages of the injector to suit the amount of steam supplied to it. This is avery important feature, as it is well known that with a given area ofchannel for the passage of the steam and water in an injector a proportionate area of steam-inlet is required for eii'ective work. If the steam-inlet be reduced, the other passages must be proportionately reduced. Should the cut-oft at the ports q fail for any reason, and the injector continue to work, the float will continue to rise until the valve J is seated, when the steam will be cut off at that point.

The stem E is shown as provided with a guide, 00; but in lieu of this the valveJ might be provided with wings and be arranged to move up and down in a bore in the cap of chamber G.

. The size and weight of the float D and the comparative length of the arms 0 and care matters of proportion that may be left to the skill andjudgment of the constructer. It is only necessary to say that the power of the float must be sufficient to overcome the friction at the packed joints.

N is an oil-cup to supply oil to the moving tube or cylinder n where it passes through the base h.

Fig. aillustrates amodification of the abovedescribed device, beingafragm entary sectional view of the base of the injector. In this case the packed joints in the base .h around the tubular part at are dispensed with and the steam is admitted between flexible diaphragms y y, to which the parts at and n are secured. In this case the flexibility of the diaphragms is relied on to permit the spindle m to play endwise. The steam is gradually cut off as the spindle rises by means of a rod, t, secured adjustably t0 the prolonged shank of the spin- (lle m. The upper end of this rod is coupled to an arm on a cock-plug, v, arranged to control the steam-inlet. The arm is shown in dotted lines in Fig. 4. Other known means may also be employed for this purpose.

In Figs. 5 and 6 have illustrated anotherl modification of my invention. Fig. 5 is a horizontal section taken in the axis of the injector, which in this case is arranged horizontally and not vertically, as in Fig. l. The distinctive difl'erence between the construction shown in this modification and that shown in Fig.1lies in the movement of the spindle m independently of the tubular shell a. In Fig. 1 these parts are shown as connected and moving together, while in Fig. 5 they move independently, the shell n moving the fastest in order that the flared upper end, z, of the shell may be brought gradually nearer to the flare z on the spindle m, so as to lessen the width of the annular steam-passage between them proportionally to the reduction of the steam-ports q. To accomplish this I prolong the tubular shell n and cut on it a double screw-thread, a, and prolong the shank of the spindle m to pass through a stufling-box, b, on n, and cut a single thread, 0, on said shank. Two collared nuts, a and c,are mounted rotatively in fixed bearings, as shown, and engage the screws 0. and 0, respectively. These nuts have bevelteeth on their peripheries, and are substantially miter wheels or pinions with tubular threaded axes. O is a bevel spur-wheel mounted on the rock-shaft F and arranged to mesh with both of the nut-wheels a and a. On the shaft F, inside of the water-chamber B, is mounted a pinion, d, which meshes with a segment, 0. This segment forms the short end of the lever or arm 6, which is fulcrumed atf f and coupled to the float-stem. Fig. 6 shows this segment-rack and pinion in side elevation.

The operation is as follows: When the float D rises the segment 0 rotates the pinion in the direction of the arrow. This rotates the nut-wheels a" and c in opposite directions through the intermediate wheel, 0, whereby the tubular shell n and spindle m are moved endwise (to the right in the figure) at diflerent speeds. When the float falls the operation is of course reversed.

To prevent the tubular shell n from turning with the nut a, I provide it with a slotted guide, g, and arrange a pin or screw, h in the shell of the injector to engage said guide, as shown in Fi 5. Other equivalent means may, however, be employed. The cone m. is

prevented from turning with nut c" by squaring or flattening its extremity i and arranging it to play in a guide, j.

Having thus described my invention, I wish it understood that I do not limit myself to the precise construction and arrangement of parts herein shown, as they may be varied somewhat withont materially departing from my invention.

I claim- 1. An automatic feed-water injector wherein the steam -inlet and the steam and water passages are decreased or increased in area by means of a float, said float being actuated by the rise and fall of the water in the generator fed by the injector, substantially as set forth.

2. An automaticinjectorforsuppl ingsteamgenerators, provided with a movable interior spindle, m, arranged to play longitudinally, a

float, D, arranged to rise and fall with the water in the generator being fed, and suitable mechanism to connect said float with said spindle, whereby the latter is actuated by the former, substantial-1y as set forth.

3. The combination,in an automatic injector, of the shell 6, internal shell, 70, external cone, 1, internal movable spindle, m, tubular movable shell n, provided with steam-ports q, base it, steam-pipe I, water-pipe K, chambers B and C, float D, and mechanism, substantially as shown, to connect the float with the spindle 'm, all arranged substantially as set forth.

4. The combination, with the guided float D and its chamber, of the screw-threaded rod E, provided with a square at its upper end, and the socketed key M, substantially as and for the purposes set forth.

5. The combination, in an automatic feedwater injector, of the movable ported tubular shell n, arranged to play in the base h, and to control by its movement the ingress of steam to the injector proper, the steampipe I, the float-chamber with valve seat f, the relief-valve cone or spindle, m, fixed to and arranged to move with the shell n, the float-stem E,'relief-valve J, shaft F, arms 6 and v, link at, and coupling u, all constructed and arranged to operate substantially asset forth.

7. A feed-water injector provided with an interior cone capable of being moved to or from the exterior cone, whereby the annular steam and Water passage between the cones may be varied in area, and provided with a tubular shell fixed to the stern of the interior cone and arranged to encircle the same, said shell having ports arranged to coincide with the steam-inlet to the injector, whereby when the interior cone is caused to approach the exterior cone the steam-inlet will be proportionately reduced in area, substantially as set forth.

8. An injector having a movable inner cone and means for reducing the area of the steaminlet in proportion as the annular space between the the exterior and interior cones is reduced, and provided with a check-valve, 8, having a lesser supplementary check-valve t, substantially as set forth.

In witness whereof I have hereunto signed myname in the presence of two subscribing witnesses.

WILLIAM MGELROY.

Witnesses:

HENRY GoNNET'r, ARTHUR G. FRASER.

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