US297826A - Lifting feed water injector - Google Patents

Description

(ModeL) 5 sne ets sneet 1. W. McELROY.

LIPTING'FEED WATER INJECTOR.

Patented Apr. 29, 1884.

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No. 297,826. Patented Apr. 29, 1884.

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INVENTOIR: W! 264 Pat ent ed Apr 29, 1884;

'W. MGELROYJ 'LIFTING FEED WATER INJEGTOR.

. I/ll/ (ModeL) By his Attorneys,

- 'VWITNESSES:

UNITED STATES PATENT rica.

WILLIAM MoELROY, or BROOKLYN, NEW YORK.

Ll FTING' FEED-WATER INJECTOR.

SPECIFICATION forming part of Letters Patent No. 297,826, dated April 29, 1884.

Application filed December 22, 1882.

2'0 all whom it may concern..-

Be it known that I, :WILLIAM MoELRoY, a citizen of the United States, residing at Brooklyn, Kings county, New York, have invented certain Improvements in Lifting Feed-Water Injectors, of which the following is a specification.

My invention relates to that class of inject-.

ors in which the injector proper is arranged between a water-supply or reservoir at a lower level than the injector, and an ejector, whereby, when the injector is to'be started, the water may be forced up into the body of the injector by atmospheric pressure created by producing a vacuum at the ejector. It is obvious that a vacuum may be created in the injector.

. ejector automatic by suitable mechanism,

whereby, when the steam is admitted to the injecting apparatus, it first acts through the ejector to lift the water and fill the body of the injector. .The steam isthen automatically cut off from the ejector and turned onto the injector to feed the water into the boiler, or into whatever is to be fed thereby. Should the vacuum break from any cause and the feed stop, the-water from the body of the in-' jector will flow back to its source; but this will instantly-cut off the steam from the in-- jector and turn it on to the ejector, which will cause a repetition of the act-ion first described and again start the feed.

My invention also relates to means for regulating the admission of steam to the injector proper by means of afloat in the generator or boiler, and also to the regulation of the passages of the injector through the same medium. These latter are improvements on the device described and shown in my application filed July 13, 1882, and numbered 66,633, which was allowed October 19, 1882.

In the drawings which serve to illustrate my present invention, .Figure l is a plan of (Model) my'improved injecting apparatus. Fig. 2 is a vertical section of same on line 2 2 in Figs. .1 and 4. Fig. S'is a sectional elevation, the sectional portion being cut in the plane of line 8 3 in Figs. 1,4, and 6. Fig. 4 is ahorizontal section or sectional plan taken substantially on line 4 4 in Figs. 2 and 3. Fig. 5 is a detached vertical midsection of the ejector, taken on line 5 5 in Figs. 1 and 3. Fig. 6 is a detached sectional View illustrating the automatic cut-off or two-way steamvalve, the section being taken in the plane of line 6 6 in Figs. 1 and 4. Figs. 7 and 8 are respectively a cross-section and longitudinal section of the rear or butt of the injector, de-.

before referred to, I have shown and de-..

scribed a mechanism whereby a float in the steam-generator, or in a chamber connected therewith, is arranged to act upon the splndle and cone of the injector in such a manner that as the float rises it reduces the size of the steam and water passages in the injector, and eventually, when the water reaches the proper level in the generator, the steam is entirely out off from the injector. for this purpose in my present application; but I do not claim them, broadly, herein. So far as the present application relates to these features, I claim only the particular means herein described for accomplishing the desired result. I

A represents the tubular shell of the injector proper. Y

B is a float-chamber, connected, by preference, wit-h the injector-shell, as shown, and communicating with the water-space of the boiler or generator by a pipe, at, and with the steam-space of the generator by a pipe, 12, both of which may be provided with controlling cocks.

.0 is a float, mounted in thechamber B on guides c c, and connected adjustably with a float-stem, d. The lower end of this float- 5 I have shown devices the cylinder 7;,- and I have shown the pipe a stem is coupled to a link, 0, which is coupled to an arm, f, on aroek-shaft, 1, (seeFig. 4,)which has suitable bearings in the base of the floatchamber B. The shaft r extends out from the chamber through a packing-gland and bears on its outer extremity an arm or crank, 71, (see Fig. 3,) which is coupled by a link with the stem z of the injector-spindle, which proj ects from the base of theinjector-shell through a packed gland. Thus the play of the float 0 up and down is caused to impart a longitudinal motion to the injector-spindle. The float-chamberis provided with a key, D, which passes through a stuffing-box in the top of the chamber, and has a square socket to takeover a square of] the end of the float-stem, whereby the stem may be turned and the float be readily adjusted up or down on the stem which screws into the said float.

E in Fig. 1 represents the boiler or generator. On the upper end ofthe stem ofthe float C is mounted a valve, which, when the float has risen to a predetermined height, will cut off the supply of steam to the injector.

In my pending application I showed a coneshaped valve on the stem arranged to seat it self by the rising of the float. In my present application Ishow acylindenvalvaj, mounted on the stem, and arranged to play in a cylindrical portion, k, of the float-chamber. The steam-pipe Z, which leads to the injector, taps from the boiler as also connected with it, but this is not essential. Indeed, in some cases I should prefer to have the pipe (4 enter the main portion of the float-chamber above the water-line therein. As the valve j is moved upward by the rising of the float, it eventually closes the mouth of pipcl, as will=be well understood. The steam has free passage through the cylinder-valve j, necessarily, in this construction.

The interior mechanism of the injector will now be described with especial reference to Figs. 4, 7, 8, 9, and 10.

The shell A ofthe injector is provided with an extension, at, in which is mounted a checkvalve, 11 The pipe 0, which leads the feedwater to the boiler, is coupled to this extension m. The cone 1) of the injector is shown in cross-section in Figs. 9 and 10. This cone has a flange, q, near its upper end, which rests on an internal flange, (1, on the shell A, being drawn up tightly by means of a screw-threaded tube, 1', which screws through a diaphragmflange, q", in the shell. F is the spindle of the injector, to which is secured the stem 1', before mentioned. The spindle F has a prolonged tip, which passes through tube 9", and is steadied by a three-armed guide, 8, secured onto tube 1'. A tubular shell, 25, screws onto the butt of the spindle F, and has a coned or beveled month, which is arranged to fit the mouth of the cone 1) at its base, whereby,when the spindle is advanced into the cone by the rise of float B, this coned face of the tubular shell will advance toward the mouth of the cone 1; and reduce the size of the water-pas sage. The water enters the shell A (in a way that will be hereinafter explained) between said shell and cone 1;, and passes back exteriorly of cone 1) to its base, where it enters the base of said cone at the passage marked u in Fig. 4. Should any water flow back or be crowded back from the cheek-valve a through the tube 1', or collect in the chamber around the mouth of the cone 1), it will pass through passages or bores o r in the cone 1), (see Figs. 4 and 9,) and find its way into the cone at apertures w w.

In order that the spindle F and shell 23 may not move with the same speed, which is sometimes a desirable arrangement, I may provide the construction shown in Figs. 7 and 8that is to say, I may make the screw which connects the shell 2! with the spindle F with a steep pitch, and provide the exterior face of the shell 25 with an oblique cam-slot, :0, arranged to engage the tip of a pin or screw, y, fixed in the shell A. Thus when the spindle F is advanced longitudinally, the slot 00 will engage the screw 9 and turn the shell 15 part way round, thus causing the screw to move it lengthwise at a diflerent speed from that of the spindle. I may or may not employ this device.

I will now describe the ejector G, which is connected with the shell of the injector by means of a pipe or tubular connection, 2.

Referring particularly to Fig. 5, a is the she1l,of the ejector, and b the outlet or overflow pipe leading to the water-tank or well. H is the steampipe which supplies the ej cctor. c is the spindle; d,the perforated tubular shell surrounding the spindle, and c is a checkvalve arranged between the injector and ejector and upheld by a spring. I have shown the ejector as in operation in Fig. 5, the water from the injector following the direction of the arrows, and the valve 0 off its seat. \Vhen the inj ector is operating, the valve 0 closes and prevents the entrance of air to the injector. I have shown the ejector as discharging upward, and the valve 0 normally upheld by aspring; but I may invert the ejector so that it will discharge downward and allow the valve 0 to close normally by gravity. The tubular shell cl forms a part of the screw-cap or plug that closes the bottom of the shell a, and the spindle c is screwed into this. There is a beveled or coned shoulder on the shell (1, which, when the cap is screwed in, fits tightly into a similarly-formed seat,f,on the interior of shell a. The tubular connection 2 of the ejector taps the shell of the injector between the flanges q q in the shell of the latter,whieh, as will be seen, Fig. 4, form a chamber in the injector, which is not open to the space exterior to the cone 1), but open to the interior of said cone. Consequently, water which enters the injector-shell exterior to the cone p must pass back and through the opening u to reach the interior of the cone, and through it the chamber between flanges q From this chamber it may pass to the ejector G.

I will now describe the means for admitting water to the injector, and the means whereby the incoming water acts to automatically supply steam to the injector after cutting it off from the ejector, which is normally open to the steam.

I is the float-chamber, which may be situated anywhere, but which I have arranged on and over the injector. This chamber is connected at the bottom with .the water-supply pipe J,

as best seen in Fig. 2. From the top of this chamber a pipe, K, leads to the injector and taps it, as shown in Fig. 3, just back'of the flange q therein.

In the chamber I is a float, L, which rises and falls with the rise and fall of the water therein. In order to always leave a free passage for the water through the chamber, I prefer to make a passage, h, in the float, as shown. All the water that enters the injector must pass through chamber I. The float L is connected to the end of a lever, j,which is mounted (see Fig. 4) on a rock-shaft, 7c,whic-h has hearings in an enlargement ofthe waterpassage between chamber I and inlet J.

M is a steam-chest,which has a valve-seat, Z, provided with ports m'm ,(see Figs.3, 4, and 6,) the former of which leads steam to the inj ector, and the latter to the ejector through pipe H. The shaft It bears a disk-valve, n, which rests upon the seat Z, and has a port, o.which, by rotation of the valve, may be brought to coincide or register with either of the ports m or W. The steam supply pipe Z admits steam to the chest M normally. In Figs. 4: and 6 the port 0 of the valve is shown incoincidence with the port at, and in Fig. 3-it is shown in coincidence with port m When there is no water in the chamber I and the float L rests at its lowest point, the valve a is in position to admit steam to the ejector through the pipe I, the chest M, port m, and pipe H; but when the action of the ejector G has produced a vacuum in the injector, and throughout the chamber I and supply-pipe J, as it will do, the water rises from the reservoir or source through pipe J and chamberI and fillsall parts of the injector, overflowing through the ejector G and back to the source through pipe b. Thus the injector is filled with cold or cool water before any steam enters it. In the passage of the water through chamber I, however, the float L is lifted, and by the time the injector is filled this upward movement of the float will have shifted valve n, cut off steam from the ejector, and admittedit to the injector. The latter will then work and continue to work unless something breaks the vacuum, when the'water in chamber I will flow back to the source, permit the float to fall, and again admit steam to the ejector, as at first.

In order to insure the admission of water to the injector before the float L rises high enough portion can pass over through pipe K.

to shift the valve, I prefer to provide a small supplementary pipe, 19, Fig. 3, extending from the lower part of chamber I to the pipe K, or

it may pass directly to the injector, whereby some water may flow through before themain This is a precautionary device, and it is designed to prevent the steam from entering the injector before the water fairly reaches it. The pipe K might, however, leave the chamber I at a lower point than that shown; but I prefer the arrangement of two pipes, as represented, as this insures the retention of the floatat its highest point while the injector is working with thesteam-port fully open to the injector, and yet insures the injector being charged (through pipe 1)) before the port m is opened. This injector requires no attention whatever, except to see that it is in working order. It is entirely automatic, supplying only when the generator needs water, and setting the ejector in operation and stopping it just as the same must be done by hand; indeed, better than it can be done by hand, as it effectually avoids the admission of steam to the injector, except when there is water there.

I do not limit myself to the form of valve or shown. It might be a slide-valve or an oscillating cylindrical valve; or, indeed, any of the known forms of valve capable of being actuated by a float. The float 0 might be arranged inside of the generator, and the lever f and shaft g might be arranged exteriorly,

the-stem of the float passing outthrough a stuffing-box.

rected to the ejector or injector as needed) to any injector, and entirely omit the float C and its appurtenances for giving motion to the injector-spindle. In this case the steam-pipe I, provided with a suitable cutoff cock,would lead directly from the generator to the steanichest M.

In Fig. 11, which is a fragmentary view, I have shown the parts h and i and the end of shaft 9 arranged in a box, 9, which may form a part of the float-chamber B and injectorshell A. This box or chamber may have a steanrtight but removable cover, whereby access can be had to theworking parts. By employing this construction I may dispense with the packing of the stem 11 of the injectorspindle, relying only on a close fit, and I may also dispense with the packing around the shaft where it passes out of chamber 13, 're-' lying to prevent leakageonly on a collar, 1",

on said shaft, ground to fit a seat on the inner face of the wall of the chamber. Indeed, I

,may employ this collar in lieu of the stuffingbox shown in Fig. 4.

Figs. 12,13, and 14 illustate a modified contion of the butt or base of the injector; Fig. I or, substantially as and for the 13, the same of the cone 1) detached, and Fig. 14 an end view of the cone. The butt of the cone is cylindrical in form, and the end of shell t fits and slides therein, substantially water-tight,- but the cone has triangular recesses sformed in its interior face, with the points upward, as in Fig. 13, whercat the water enters alongside of the shell i. As the shell advances, however, these water-ways are reduced in area, as will be well understood, and will be cut off entirely when the cylindrical plunger-like shell passes them.

In Fig. 15, which is a fragmentary sectional view of that portion of the injector adjacent the point where the ejector G is connected with it, I have shown a slightly-modified construction in which the tubular screw-threaded nozzle r is omitted, or rather made in one with the cone 1). In this construction the injector exhausts the air wholly through the passages o 1), instead of partially through these passages and partially from the interior of the cone direct. It may be necessary to say that the cone 1) is steadied in place in the shell A by means of exterior ribs, 16, as shown in Figs. 9, 10, 13, and 14; and it may also be necessary to say that the steam from port at enters the shell 15 through a port or aperture in the same, as shown in Fig. 4, so that when the said shell is moved forward (together with the spindle F) by the action of the float O the steam will be gradually throttled or cut off. This was shown in my pending application,and is not herein claimed.

The shell 23 may be made to fit snugly in the injector-shell, or be packed.

I claim as my invention-- 1. The combination, with the injector, of an ejector, a float-chamber arranged between the injector and the water-source, a pipe or water-conduit leading from the water-source to the float-chamber, and a pipe leading from said chamber to the injector, a float in said chamberconnected with and arranged to actuate a steam-valve in a steam-chest by its rise and fall, said steam-chest arranged to receive steam from a generator, and said valvearranged to control the admission of steam to the injector and ejector,whereby the passage of waranged to exhaust the air from and through the injector, whereby the water is caused to rise and fill the injector, and means, substantially as described, whereby the passage of water on its way to the injector cuts the steam off from the ejectorand admits it to the injectpurposes set forth.

3. The combination of a float arranged to rise and fall with the rise and fall of the water in a steam-generator, a valve actuated by said float and arranged to stop the passage of steam from the generator to an injector, the said injector, the steam-chest M and the steampipe leading thereto, a valve, a,a float-chamber, I, connected with water-source by a pipe, J, and with the injector by a pipe, K, a float in said chamber I arranged to actuate the valve a, and an ejector connected with theinjector and arranged to exhaust the air therefrom, said valve a being arranged to control the steam ports and passages leading from the steam chest to the injector and ejector, respectively, all arranged to operate substantiall y as set forth.

4:. The ejector comprising the shell a, provided with a coned seat, f, the tubular perforated shell cl,arranged to screw into the bottom of the shell a, and its upper end arranged to rest on the seat f, the axial spindle 0', secured to the shell d, and the check-valve c, all combined and arranged substantially as set forth.

5. The combination, with the. shell A of the injector provided with internal flanges, g the cone 1), provided with a flange, q, passages 02 o, and apertures 10, the tubular screw 1', guide s, valve a, spindle F, and shell if, all arranged substantially as set forth.

6. The combination, with the shell of the injector, of the spindle F, arranged to play longitudinally therein, the cone 1;, the shell t, screwed onto the base of the cone, and provided with an oblique slot or groove, 00, and the screw 3/, mounted in the shell of the injector, and arranged to engage said groove 0:, all constructed substantially as and for the purposes set forth.

7. The combination of the injector proper, the ejector, the float-chamber I, water-supply pipe J, pipe K, float L, lever j, shalt 7c,valve n, steam-chest M, and steam-pipe I from the generator, and the steam-pipe H, leading to the ejector, all combined and arranged to operate substantially as set forth.

8. The chamber [,provided with a main pipe, K, leading from its top to the injector, and an auxiliary pipe, 1), leading from said chamber at a lower point,whereby water is supplied to the injector from said chamber I before the float L rises to its highest point, substantially as set forth.

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

lVitnesses: WILLIAM MOELROY.

HENRY CoNNErr, ARTHUR O. FRASER.

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