US467427A

US467427A - Steam-jet blower for furnaces

Info

Publication number: US467427A
Authority: US
Publication date: 1892-01-19
Anticipated expiration: 1909-01-19

Description

(No Model.) 3 SheetsSheet 1. W. MGOLAVE.

STEAM JET BLOWER FOR FURNAGBS.

No. 467,427. Patented Jan. 19, 1892.

Lil]! EEEEE 3 Sheets-Sheet 2.

(NoModeL) W. McCLAVE. STEAM JET BLOWER EOE FURNACES.

No. 467,427. Patented Jan. '19-, 1892.

THE moms PETERS cc., PHDTO LIYHD wnsnmsfuu, n. cy

3 Sheets-Sheet 3.

(No Mudel.)

W McGLAVE STEAM JET BLOWER FOR FURNACES.

No. 467,427. Patented Janhl9, 1892.

wTl'iE ToaZZ 1072,0722 it may concern.-

UNITED STATES PATENT OFFICE.

lVILLIAM MCCLAVE, OF SCRANTON, PENNSYLVANIA.

STEAM-JE T BLOWER FOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 467,427, dated January 19, 1892; Application filed October 28, 1891. Serial No. 410,074. (No model.)

Be it known that I, WILLIAM McOLAvE, a citizen of the United States, residing at Scranton, in the county of Lackawanna and State of Pennsylvania, have invented certain new and useful Improvements in Steam-Jet Blowers for Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. i My invention relates especially to steametting devices for steam-blowers of the types illustrated in Letters Patents Nos. 281,774 and 318,008, granted to me July 24, 1883, and May 19, 1885, or any other types of steam-jet blowers whereby jets of steam cause a body of air from the outside of the furnace to be drawn 1nto an air duct or tube of any suitable form, and this air mingled with the steam to be forced into the furnace through the mass of burning fuel of the fire-bed, thereby facilitating the combustion of the fuel and producing other beneficial results.

My improvements will be fully understood from the following description, claims, and accompanying drawings.

Figure l is a perspective View illustrating in ring form my improved steam-jetting device for a steam-blower as seen from its forward end. Fig. 2 is also a perspective view of the same as seen from its rear end. Fig. 3 is a vertical longitudinal section of a combined conical and cylindrical air-duct of a furnace with my improved steam-jetting delivery device for a steam-jet blower applied thereto, the air-duct being in section and its connections partly in section and in elevation. Figs. 4, 5, 6, 7, and 8 are sectional or profile views of my improved steam-jetting device for a steam-jet blower in the several crosssectional forms that it is preferably constructed. Fig. 9 is a perspective view of a portion of the steamjetting device for a steam-blower as formed with an air-cutting ridge and projecting steam-jet bosses, only one of a series of bosses being shown. Fig. 10 is a diagram illustrating the difference between the action of the steam-jets upon the air with a ring-jetting device of ordinary construction and a flattened-ring form of jetting device similar to mine shown in Fig. 4 and in other figures of the drawings. Fig. 11 isa section similar to Fig. 3, but showinga single ring-shaped steam-jetting device for a steamjet blower and a cylindrical air-duct with an intermediate conical or converged discharging portion. Fig. 12 is a rear end view of a steam-jetting device similar to that shown in Fig. 3, but with only one connecting-arm between the inner and outer steam-j etting rings. Fig. 13 is a Vertical cross-section of an airduct and myimproved steam-jetting device fora steam-jet blower made in rectangular form, the steam-jetting device of the blower being divided into numerous small open hollow squares; and Fig. 15 is a cross-section of an oblong air-duct and a front elevation of my improved steam-j etting device for a steamjet blower in form ofa long fiat tube with tapered front and rear edges and with projecting steam-jet bosses at its front end.

The main feature of m y invention, as shown in the drawings, is a steam-jetting device A for a steam-jet blower, either of ring or other geometrical form (but preferably of ring form) made with a flator narrow chamber a for the reception and circulation of the steam, which'enters it from a steam-pipe B, leading from the boiler or other source of supply, said fiat or narrow chambered steam-jetting device being formed with edges 5 b, which, to produce the best results, should be tapered, substantially as illustrated in the drawings, so as to allow the air which is drawn into the air-duct O by the jets of steam to pass to the furnace with the least possible obstruction and diversion from the straight course.in which it started in entering the air-duct, and thus to insure the closest possible relation of said air to the steam-jet passages c and to the jets of steam issuing from the said jet-pas. sages c at the front of the chamber a of the steam-jetting device. This desirable action of the air is illustrated in Fig. 4; of the drawings, wherein the air is shown as being brought in contact with the jets of steam almost immediately at the point where the steam is projected from the delivery end of the jetting device. Thus controlling the air in its passage through the duct 0 enables the steam-jets to project the air into the furnace with its full initial velocity or force from about the time the steam emerges from the jet-passages until its initial velocity is about fully utilized for projecting, forcing, or drawing air into the furnace.

The steam jetting device shown in Fig. 6, which in this illustration is of ring form, may in its section from end to end have one side fiat from its rear to near its front end, and its inner side near its rear end may be slightly curved; or it may have a slightly convex and concave form, or a reverse curvature may be given to its sides near its rear end, as shown in Fig. 7, so that it shall have a bellshaped mouth, or it may be in form of a double convex lens, as shown in Fig. 8.

It is very important to have the front end of the steam-jetting device made with jetpassages of cylindrical bore at and for a sufficient distance back from their outlet ends to insure the formation of well-defined parallel-sided steam-jets before they issue from said passages. To this end these passages are made either directly in the solid V-shaped front end of the steam-jetting device, as shown in Figs. 4 and 8, or in spaced bosses d, formed on the tapered solid front end of the steam-jetting device, as shown in Figs. 5, 6, 7, and 9, or formed in the plane or flattened surface of the tapered solid front end of the said steam-jetting device, as shown in Figs. 1 and 3, min nipples screwed into the tapered solid front end of the etting device.

- It will'be understood that the length of the cylindri'cally-bored or parallel-sided portions of the passages only requires to be sufficient to form the steam into parallel-sided jets before the jets issue from the outlets. Therefore if the length of the cylindrical or parallel-sided portions is about equal to the diameter of .the outlets, the desired result-via, the projection of the steam with great velocity and to the greatest possible distance into the air within the casing of the blower in order to induct the greatest possible quantity of air by the friction of the jetswill be accomplished. This proportion may be varied fromthe minimum given, so as to have the length much greaterthan the diameter of the outlets.

In the drawings the hollow connectingarms f of the steam-jetting device for a steamblower are shown at f as drawn down to nearly a fiat tubular form from a cylindrical tubular form. By this means the connectingarms can be inserted through the ordinary circular holes of the casing forming the airduct. To effect this the circular parts of the arms are made of sufficient length beyond the inner surface of the casing forming the duct to permit the steam-jetting device for the steam-jet blower to be lowered and raised in said holes of the duct until the connection is effected and the said device secured centrally in the air-duct. As usual, one of the arms may have a screw-cap g,on removal of which the steam-jetting device can be cleaned by blowing out with the steam of the boiler or other source of supply.

In Fig. 12 the single ring shown in Fig. 11 has a central ring A arranged within it, the same as in Figs. 1, 2, and 3; but the said inner ring is connected with the outer ring by a single hollow arm f instead of by two hollow arms f f, as in said figures, and while this is so the removable cap g for permitting the steam to be blown through the armsff of the steamjetting device is provided. The construction shown in Figs. 14; and 15 is similar in effect to the constructions shown in Figs. 1, 2, 3, &c.,

the only difference being in the geometrical construction of the blower-casing and the arrangement of the steam-jets on straight lines and in squares. Inthese views the tapered front and rear ends are retained on' the steam- I jetting devices of the steam-jet blower.

In Fig. 13 the steam-jetting device of the blower is constructed of a series of radial arms on, united in a hollow hub m, one series of the arms having two steam-jet passages c and the other series a single jet-passage c. If desired, a single jet nozzle or passage may be applied centrally in the closed front end of the hollow hub.

By setting the steam-j et passages in the order shown in Fig. 13 a very effective action of the combination of jets for producing a blastis produced, and by arrangingthe jets in squares and on straight lines, as in Fig. 14, a very effective and powerful blower is obtained.

For light work a blower similar to Fig. 15 will answer a good purpose. It is usual in steam-blowers to either use an air duct in form of a simple truncated cone without the cylindrical extension shown in Fig. 3, or a truncated cone with a cylindrical extension, as O in Fig. 3, or an intermediate conical portion, as in Fig. 11, and sometimes to use a square or oblong box having parallel sides, as in Figs. 14 and 15, or to use a simple cylinder with parallel sides. .My invention is applicable to all such air-ducts with useful results.

By referring to Fig. 10 it will be seen that in the use of the'ordinary ring-shaped steamjetting device formed of a tube having a steam-chamber of a crosssectional form, which is a true circle, great obstruction to the passage of the air through the duct is offered; also, that the body of air coming in contact with this ring at its rear end and passing along the inner and outer surfaces of the ring is divided and displaced laterally in such a manner that it meets the jets of steam at points so remote from the point-s from where they start and receive their initial velocity or determined lines of projection that a greater part of their effective power for forcing the air into the furnace is lost, and by referring to Fig. 4, representing a profile view of a hattened or narrow ring-shaped steam-jetting device, it will be seen that this is avoided, as the air comes in contact with the steam almost immediately at the points where it receives its initial velocity or determined lines of projection.

IIC

chamber on reversely-inolined lines forming its escape-passage the tendency of one portion of the steam passing to said passage is to interfere with the other portion of steam passing to said passage, and the consequence isthe destruction of the effective projecting force of the steam for drawing in a body of air, the steam soon expanding and forming a cloud, which tends to retard rather than compel the passage of the air into the furnace. My invention of having the steam-circulation chamber narrow or flattened and its passages of a determined cylindrical form or with parallel sides and said chamber of considerable length from the inside of the steam-chamber of the steam-jetting device to the outside front delivering end thereof, together with the spacing of these passages, renders the employment of the lenticular or flat steamblower practical and very beneficial, the use of such blower offering the minimum obstruction to the passage of the air through the airduct and allowing the air to come in immediate contact with the steam-jets, thereby insuring a powerful and effective blast.

It is not absolutely necessary to set the steam-jetting device of the blower into the air-duct, for if it is set a slight distance in rear of the same a very effective blast is produced; but while this is so experience has proved that the best arrangement is to set the blower far enough within the duct to have the initial velocity of the steam carry the air into the ash-pit of the furnace before the steam-jets break and form an obstructing cloud within the air-duct.

The blower may have one of its connecting arms omitted, and in such construction it can be suspended by a branch pipe of the steamsupply pipe, as in my patent, No. 281,7 74, and when thus arranged a special blow-out opening can be provided in the blower and closed by a removable screw-plug.

What I claim as my invention is- 1. A stean1-jetting device for a steam-blower for boiler-furnaces and similar purposes, having a flat or narrow steam reception or circulation chamber between its rear and front ends and separate steam jet ornipple passages at its front end, said passages being cylindrically bored or parallel-sided to a suitable extent, substantially as described.

2. A steam-jetting device for a steam-blower, having a flat or narrow steam reception or circulation chamber between its front and rear ends, tapered rear and front ends, and separate steam-jet passages or nipples at its front end, which are cylindrically bored or parallel-sided to a suitable extent, substantially as described.

3. A steam-jetting device for a steam-blower, having a flat or narrow steam reception or circulation chamber between its front and rear ends and tapered at its front and rear ends and having spaced bosses on its front end, said bosses being cylindrically bored to a suitable extent, substantially as described.

4. The flattened or narrowed steam-jetting device having a tapered rear end, separate steam-jet passages or nipples at its front end, and one or more partly-flat and partly-circle lar connecting ends, in combination with the air-duct having circular holes through which said end or ends pass, substantially as described.

5. A plurality of flattened or narrow steamjet devices, all in communication, said devices respectively having tapered rear ends and separate steam-jet passages or nipples at their front ends, which are cylindrically bored or parallel-sided to a suitable extent, substantially' as described.

6. The flattened steam jetting device having a single taper at its rear end and separate jet passages or nipples at its front end,which are cylindrically bored or parallel-sided to a suitable extent, substantially as described.

7. The flattened steam-jetting device having a single taper at its rear end and a concave and convex or reversed curved form near said rear end and provided with separate jet passages or nipples at its front end, which are cylindrically bored or parallel-sided to a suitable extent, substantially as described.

In testimony whereof I hereunto affix my signature in presence of two witnesses.

WILLIAM MoOLAVE. \Vitnesses:

E. T. FENWICK, C. SEVERANOE.