US1050892A

US1050892A - Blower.

Info

Publication number: US1050892A
Application number: US52081809A
Authority: US
Inventors: Edgar C Wiley
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-10-04
Filing date: 1909-10-04
Publication date: 1913-01-21
Anticipated expiration: 1930-01-21

Description

B. G. WILEY.

BLOWER.

APPLICATION FILED 0012.4, 1909. 1,050,892, Patented Jan. 21, 1913. r Mums-sna l.

N v g) 1 3 .gv I q) k mama:

B. C. WILEY.

BLOWER.

APPLICATION FILED OUT. 4, 1909.

Patented Jan. 21, 1913;

2 SHEETS-SHEET 2.

IZNESSES orrrcn.

' EDGAR C. WILEY, OF LYNQHBUBJG, VIRGINIA.

Browne.

Specification .f' Letters Patent.

t t

5 ,2 191 Application filed October 4; 1909. Serial No. 520,818.

To all whom it may concern:

Beit known that I, EDGAR CLARENCE WI- LEY, a citizen of the United States, residing at Lynchburg, in the county of Campbell and State of Virginia, have invented. cerers, of which the following is a specification. My present invention relates to steam blowers for furnishing artificial draft to g nipple 10.forming the shell of rimary noz:

furnaces and the like, and resides particularly in an improved controlling valve therefor.

The essential feature of my device isthe I use of a secondary valve in conjunction with a steam valve controlling piston, the said secondary valve being so arranged as to adrnit steam at low pressures to the steam valve; controlling piston as the boiler pressure varies. By thus operating this valve controlling piston at a low pressure, I am enabled, as will hereinafter become more apparent, to secure a wider range of movement of the steam controlling valve from a given fluctuation of boiler pressure than could be had were said fluctuation of said boiler pres.- sure allowed to act directly upon said steam valve controlling piston.

With this general statement of the purpose and principle of the device, I will now proceed to a detailed description of the mechanism, reference being bad by numeral to the accompanying drawings, wherein,

Figure 1 is an elevation, partly sectional, of a boiler setting and grate with my improved blower mechanism applied; and Fig.

2 is a transverse section of the controlling mechanism, the plane of section being taken through the center line of the device.

Referrin to the drawings, 1 represents the boiler s ell; 2 the boiler setting; and 3 the grate. These parts may be of any approved construction and are shown merely betterto illustrate the mode of. applying the blower.

Projecting into the ash pit 4 is the blower tube or draft tube 5, which is embedded in the brick work of the setting 2. Near the outer end of the draft tube is the nozzle which directs the steam jet. This comprises a restricted primary nozzle 11, discharging a jet of steam into the longitudinal passage 6? of a secondary nozzle 6. Leading into 5 relative positions.

this passage 6*- are lateral openings 6,

through which air is drawn into the secondary nozzle by the steam jet leaving the primary nozzle, so that a mixture of steam and air is discharged from the secondary tain new and useful Improvements in Blow- ?nozzle 6. This results in a larger jet, and

induces a greater flow of air through the Z blower tube.

The secondary nozzle 6 is screwed onto a zle 11, so that the two are he (1 in proper upon the body of a tubular casting 7, which receives steam from the boiler through a ,pipe 8. The casting 7 also serves as a support for the nozzle and its valve mechanism, being threaded at 9 into the shell 5.

The prlmary nozzle 11, together with a The nipple 10 is formed tapering valve rod 12" which is movable longitudinally through the nozzle orifice, forms a steam-controlling valve, the opening of Y the orifice being restricted as the valve is moved to the left. The rod 12 is guided by a sleeve-bearing 13 in the casting 7 with which the rod makes a sliding and approximately steam tight joint. The rod 12 terminates in the piston 14, which slides in a cylinder 15 formed integrally with the casting 7. The rod 12 and its attached piston 14 are urged to the right b a spring 16 coiled about the rod 12, and hearing against the casting 7, as shown. The movement of the rod 12 to the left is limited by the shoulder 17 which abuts against the casting 7. This is to prevent the tapered portionof the rod from sticking in the steam orifice of the primary nozzle 11 in case the rod were forced strongly to the left. The shoulder 17 is so positioned as to allow tight closure of the.

primary nozzle 11 by the rod 12. The space to the left of piston 14 is vented at 18 to relieve any pressure due to leakage past the bearing 13 or iston 14. The passage in casting 7 is drained by a pipe 19 to a drain cook 20, to remove an condensed steam, and a pi 21 provided with a cock 22 serves as a simi ar drain for the right end of cylinder 15. The right end of cylinder 15 is closed by a screw plug or cylinder head 23, whichv makes a steam tight joint with the cylinder walls. I I

Threaded in cylinder head 23 is a rod 24 which serves as an adjustable abutment to limit. the movement of piston 14 and its atis provided with a knurled head 25 and a jam nut 26, so that it may be readily. adjusted and locked in position.

The piston 14 makes a rather loose fit-1n the cylinder 15, so that there may be a slight leakage.- of. steam past the piston. It is obvi-.

ous that an increase of ressure in the cylinder 15 will tend to 'orce the piston 14 and its attached valve rod 12 to the left, thus reducing the opening in primary nozzle 11, while similarly a reduction in pressure causes movement to the right, and consequently opens the primary nozzle I 11. Spring 16 is of such strength that it allows the piston 14 to move through its entire range when the pressure in 15' fluctuates through the range of variation allowed in the boiler pressure; that is, if the boiler pressure may fluctuate five pounds the piston 14 -will move throughout itsent-ire range when the pressure in cylinder 15 rises from zero pounds to five pounds gage.

Itv now remains to describe a mecha-nism which will cause the existence of approximately one pound pressure in the cylinder 15 for each pound the boiler pressure rises abovethe desired minimum.

27 is a small pipe bringing steam from the boiler. 'It is screwed into. a casting 28 which forms a seat for a valve 29 located in the casting 30 also screwed to castings 28. This casting 30 is connected by a pipe'31 to the cylinder 15. The valve 29 is held upon its seat by a spring 32, and the load upon this spring is'so adjusted that the valve29 is held to its seat against the minimum pres-- sure desired to exist in the boiler, but when this pressure is exceeded the valve 29 will be forced from its seat against the springs action, thus admitting steam to the casting 30, whence it will pass through the pipe 31 to the cylinder 15. The load on spring 32 is adjusted by means of a rod 33 threaded in casting 30, and carrying a swive'led block 35 bearing against the end of spring 32. A knurled head 34 mounted on the rod 33 serves as a means for turning the rod to adjust the spring.

The operation of the device is as follows: Let us assume that the desired average pressure for the boiler is 100 pounds, and that a maximum fluctuation of five pounds may be allowed. In this case the spring 16 would be so chosen that the piston 14 would move through its entire range for a variation of five pounds, and the spring 32 would be so adjusted that valve 29 would be lifted from its seat at a pressure of 97% pounds. As-

. suming the pressure in the boiler to be below 97% pounds and to be rising, it is obvious that valve29 will be closed, and that due to the leakage past piston 14 there-will be a pressure of zero pounds gage in the cylinder 15. As the pressure in the bOllGl'yhOWBVGI, rises and exceeds 971}. pounds, the valve 29 will be liftedv from its seat and steam will flow into casting 30, and by pipe 31 to cylinder 15. Conversely, as the boiler pressure falls, the decreased tendency to open valve 29 will cause this valve either to close, or to tend to close. The leakage past the piston 14, aided by the condensation of steam in the cylinder 15, will quickly reduce the pressure in this cylinder to the appropriate amount. It has been found that the above mentioned leakage and condensation are suflicient to se cure the necessary reductions in pressure;

It has been found by experiment that each pound. increase above pressure necessary to open valve 29 will cause approximately a' corresponding pound increase of pressure in pipe 31, and cylinder 15, the increased pressure in casting 3O assisting in closing valve 29 as soon as this increased pressure is established. Asthe pressure in cylinder 15 increases, the'piston 14 is forced to /the left, its movement being approximately proportional to the increase in pressure. Thus as .the boiler pressure rises the opening of primary nozzle 11 is reduced, and the flow of steam to the blower consequently restricted:

Hence the blowing action is diminished, and less draft is supplied to the furnace. It is entirely feasible to have a fluctuation of five pounds in the cylinder 15 move the valvestem longitudinally s of an inch. This considerable range of motion permits a very nice adjustment of the orifice, and consequently a gradual-fluctuation of the bloweraction with fluctuations in boiler pressure.

In most devices heretofore constructed the boiler pressure has been caused to act directly upon a regulating device, as for instance a damper regulator connected to a throttle on the blower steam pipe. Here, however, the spring or equivalent mecha: nism opposing the steam pressure, must be sufliciently strong to overcome the entire boiler pressure, and consequently the movementfof the apparatus for a fluctuation of five pounds is very slight. Any nice regulation of the blower action by such device is therefore impossible, and the blower is merely turned on and oil as the pressure fluctuates past a certain set point. This action is most unsatisfactory, and is avoided by my invention.

V In the practical operation of my device the blower intensity is adjusted to the de-- mands for steam'made upon the boiler, the blower tending to maintain a practically uniform pressure in the boiler by a practically continuous operation of the blower. The intensity of the blowing, however, va-

the blower action is not intermittent, but I steam is regulated by a valve interposed in the pipe leading to the orifice.

The use of a primary and a secondary nozzle increases the efliciency of the device, but the controlling mechanism will function in the manner described regardless of the type of nozzle used.

In the above description I have called attention to the fact that -slight leakage is allowed to occur past the piston 14. It is not essential that this leakage should occur at this point, as any other means for accomplishing the purpose of gradually bleeding pressure from the right end of cylinder 15 will accomplish the same result, and cause the device to function in the identical manner. It seems probable that there is a slight flow of steam constantly past valve 29 when pressure exists in the right end of cylinder 15, but this flow, if it occurs, is very slight.

In the claims, I shall use the term excess pressure valve to designate any valve that performs the function of valve 29; z. 6., creates a pressure on its low side equal approximately to the excess of boiler pressure above the desired minimum.

Having thus described my invention, what I claim is 1. The combination of a boiler; a furnace; a draft tube adapted to furnish air to said furnace; a nozzle having a discharge orifice standing in line with said draft tube; connections for supplying an expansible fluid under pressure to said nozzle; a movable nozzle-valve member adapted to vary the area of said orifice; a piston connected with said nozzle-valve member to move the same; a spring held valve connected wit-h the boiler and adapted to admit steam at reduced pressure against one face of the piston to urge the nozzle-valve in a closing direction; means for gradually venting such steam pressure from said piston face; and a spring opposing the closing movement of the nozzle-valvev member. 7

2. The combination of a boiler; a furnace;

a draft-tube adapted to furnish air to said furnace; a nozzle having an orifice standing in line with said draft tube; connections for supplying an expansible fluid under pressure to said nozzle; a movable nozzle valve mem- 'ber adapted to vary the area of said orifice;

a piston connected with said nozzle valve member to move the same; an excess pressure valve adapted to open under boiler pressure to admit steam from the boiler against one face of the piston to urge the nozzle valve member in a closing direction;

furnace; a nozzle having an orifice standing in line with sald draft-tube; connectlons for supplying an expansible fluid under ressure to said nozzle; a conical valve mem or amally movable through said discharge orifice to vary the area thereof; an adjustable stop adapted to limit the opening movement of the nozzle valve member; a piston connected.

with said conical valve member to move the same; an excess pressure valve adapted to open under boiler pressure 'to admit steam from the boiler against one face of (the piston to urge the conical valve member in a closing direction; a spring adapted to urge said excess pressure valve in a closing direction; mechanism for adjusting the stress on the spring; means for slowly venting pressure from the piston face; and a second spring adapted to oppose closing movement of the conical valve member.

4. The combination of a boiler; a furnace; a draft tube adapted to furnish air to said furnace; a nozzle having an orifice-standing in line with said draft'tube; connections for supplying an expansible fluid under pressure to said nozzle; a valve adapted to control the flow of such fluid through said nozzle; a piston operatively connected withv said valve; an excess pressure valve adapted to open under boiler pressure to admit steam from the boiler to one side of said piston to move the first named valve in a closing direction; a spring adapted to urge the excess pressure valve in a closing direction; means for slowly venting pressure from said piston; and a spring adapted to oppose the closing movement of the first named valve.

5. The combination of a boiler; a furnace; a draft tube adapted to furnish air to said furnace; a nozzle having an orifice standing in line with said draft tube; connections for supplying an expansible fluid under pressure to said nozzle; a valve adapted to control the flow of such fluid through said nozzle; a piston operatively connected with said valve; an excess pressure valve adapted to open under boiler pressure to admit steam from the boiler to. one side of said piston to move the first named valve in a closing direction; a spring adapted to urge the exirection; means for g, I 1,050,592 v means for adjusting the stress in said. two subscribing witnesses. spring; means for slowly venting pressure from-said. piston; and a. spring adapted to li'oppose the closing movement of the first Witnesses: v named valve. I KATIE JENNINGS,

- In testimony whereof I have signed my GRACE H. Mmoon.

, cess pressure valve in s) closing direction; name to this specification in'the presence of EDGAR CLWILEY. Q