US717566A - Steam-blower. - Google Patents

Description

PATBNTBD JAN. 6, 1903. E'. GIBsoN. STEAM 13mm-3P..l APPLICATION FILED JUNE.17, 1901.

R0 MODEL.

vW vl. CNL. V.. N Il Arromvfy ilNrTEn STATES- VPATEiwr" rtliche EDWARD GIBSON, or JERSEY orrir, NEW JERSEY.-

STEAM-BLOWER.v

SPECIFICATION forming part 'of Letters Patent No. 717,566, dated January 6, 1.903?. Application filed June lil, 1901. Serial No. 64,841. (No medal.)

To all whom t may concern.-

Be it known that I, EDWARD GIBSON, a citizen of the United States, residing in Jersey City, in the countyof Hudson, in the State of New Jersey, have-invented a certain new and useful Improvement in .S'teamfBlowerm of which the following is a specification.

It has long been known that fires can be successfully blown by driving air into the ashpit by the friotional action of strong currents of steam. Steam at full pressure is laken from the boiler and allowed to escape with great force through small apertures in pipes arranged in a passage through which air is introduced into the space under the grate. Properly conditioned a large quantity of air is thus introduced at a pressure sufficiently high to materially increase the upiiow through the mass of burning fuel. The steam on reaching the re assumes a dry and superheated condition, and after this condition is attained it is believed to contribute much to the clearness and vigor of the combustion. My blower is of such class. Among other modes of arranging such perforated pipes has been the placing them in an aperture in the door and making them turn therewith in the opening and closing of the door. I do this. I have devised simple means for drying the steam thus used before it is carried into the ash-pit, thus attaining economy by bringing somer of the spent heat back to ,the fire, and this without risk of ever too much superheating it. This allows the maintaining of a perfect swinging joint in the line of the doorhinges. I have discovered that by making the entire blowing means for a door in one continuous length of pipe I can without requiring any other than the ordinary dooropening blow more economically and efliciently than by any construction of suc-h device known to me and provide for easily cleaning the interior of the coils when required. The pipe in the door is bent to an approximate volute, with its center carried inward, making it tapered. I will refer to it sometimes as snail-formed.7 I vary from the simple snail form in three important respects: First, the coil is nearly elliptical, matching to a casing put into the ordinary door-opening; second, the inner` end departs from the snail form entirely and stands at right angles to the plane of the door, and, third, such end has a cap which may be removed to blow through for cleaning. This cap, like the en tire face of the coil which is presented toward the interior of the ash-pit, is perforated.

3 is a horizontal section, on a larger scale, on.

the line 3 3 in' Fig. l.

Similar letters of reference indicate corresponding parts in all the tigures where they appear.

A is the front end of the boiler; A', the stack 5 A2, the front connection or uptake, sometimes termed breeching, and the horizontal dotted line A3 the upper tier of ordinary tubes, (shown simply as a single iiue,) which perform the usual function of bringing forward to the front connection the gaseous products of combustion which have 'moved rearward under the body.

B is a pipe bringing steam from the dome of the boiler, (not shown,) and B a cock which may control it, but which will usually stand fully open. B2 is a coil or series of traverses of this pipe through which the steam passes,arranged at thefront end of theboiler above the line A8, so that these pipes do not interfere with the cleaning of the tubes. The steam in traversing the coil Aa is superheated.

C is the grate, c the ash-pit space under the grate, and D the ash-pit door, formed with a nearly elliptical casing D opening through it and turning on hinges D2, which may be of the ordinary construction.

vand a half) of complete turns or coils of the pipe in the tapering coil. Each turn has straight portions M' M3, &c., extending horizontally, and the outer and larger coils have each considerable upright portions M2. Each succeeding turn is smaller and set farther inward toward the interior of the ash -pit. The innermost end M4is-turned, as shown, to extend about in the line of the motion of the air and is screw threaded and receives a nely-perforated cap N n.

There is in addition to the rarely used cock B at the higher position a cock D4 more conveniently reached and which controls the flow of steam from the superheater to the tapering coil. When the door D is shut and this cock is open or partially open, the steam jets inward into the ash-pit from all the apertures m, so that each jet moves past, but does not strike the coil next within that from which it issues. The several jets n from the cap N blow obviously Without risk of striking anything. All drive the surrounding atmospheric air inward to induce a plenum in the ash-pit and accordingly to move the air and superheated steam up through the grate to quicken the fire,according as the boiler-pressure is high or low and as the cock D4 is more or less opened. To obtain access to the ashpit to remove ashes and clinkers or for any other purpose,it is only necessary to shut the cock D4 and swing open the door D, carrying the elliptic casing and tapering coil with it. This coil or snail may, withits capped end N, extend well into the ash-pit, taking care not to reach so far that the smallest tapering coil or the casing D will not strike the opposite side of the doorway in opening and closing, and when swung quite open it will simply project outward from the boiler-front and willoifer no obstruction to working in the ash-pit. The construction allows so much space for the passage of the air by its motion simplyincliuing outward from thecenter line in passing each coil that no appreciable resistance seems to be due to the presence of the pipe, allowing natural draft to be made available when the steam is partly or entirely shut off.

Modifications may be made without departing from the principle or sacrificing the advantages of the invention. I can vary the sharpness of the curves at the corners of the nearly elliptical casing D and the nearly elliptical tapering coils of the snail. I can vary the diameter ot' the pipe and the sizes of the perforations, taking care to have such a ratio that the pressure of the steam will be maintained with only slight loss quite to the inner end. The door D may be made to overlap more or less upon the metal of the boilerfront adjacent to the doorway, the main function of the door exterior to the open casing D' being to simply prevent the air in the ashpit, which is a half-ounce per square inch or some other amount above atmosphere, from blowing out. The superheating of the steam may be eected at other points than shown. One may be in the back connection. A specially good place is under the boiler in rear of the bridge-wall.

I claim as my invention- 1. As a means for blowing into ash-pits by steam an approximately helical but tapering coil of pipe mounted in an aperture in the wall and connected with a steam-boiler, the several convolutions being perforated on the sides presented toward the interior of the ashpit and so arranged that the jets of steam projected from each convolution pass on the outer side of each of the smaller convolutions all substantially as herein specified.

2. As a means for blowing into ash-pits by steam-jets, the combination with the swinging joint E, door D and casing D' of a nearly elliptical tapering coil M within said casing D' formed from a single continuous length of pipe having a line of perforations m arranged to project jets from each convolution past the next smaller convolution, all substantially as herein specified.

3. As a means for blowing into ash-pits by steam-jets, the combination with the swinging joint E, door D and casing D', of a nearly elliptical tapering coil M within said casing D formed from a single continuous length of pipe havinga line of perforations m, arranged to project jets from each convolution past the next, the axially-turned end M4 and the removable cap N on such end, all adapted to serve substantially as herein speciiied.

Il. As a means for blowing into ash-pits by steam-jets, the combination with the swinging joint E, door D and casing D', of a nearly elliptical tapering coil M within said casing D having perforations m, arranged to project the steam from each convolution past the next, and with the drying and superheating coils B2 arranged in the spent gases and communicating with said coil M through said joint E, all arranged for joint operation substantially as herein specied.

5. The combination with a closed ash-pit provided with an air-inlet passage opening into said ash-pit below the grate, of an airimpelling steam-pipe in said passage in the form of a tapering coil so as to cause little obstruction to said passage and provided with orifices so arranged as to project the steam in jets parallel with the axis of said passage and of said coil and thereby to avoid the interruption of said jets by contact with one another or the inner convolutions of said coil, substantially as described.

In testimony that I claim the invention above set forth I affix my signature in presence of two witnesses.

EDWARD GIBSON.

Witnesses:

J. B. CLAUTIOE, M. F. BOYLE.

IOO

Images