US2122733A - Stoking installation - Google Patents

Description

July 5,1938. J, N VAN RlJSWIJK 2,122,733

STORING INSTALLATION Filed July 31, 1935 2 Sheets- Sheet 1 ZW'AMMMWOR.

' W MTORJIEZ Jill 5, 1938.

J: N. VAN RIJSWIJK STOKING INSTALLATION Filed July 31, 1935 2 Sheets-Sheet 2 FIG? FIG; 3

- Patented July .5, 1938 PATENT OFFICE 2,122,733 STORING INSTALLATION .lacobus Nicolaas van Rljswijk, assilnor to Iron Netherlands,

s Gravenhage, Fireman Manufacturing Company, Portland, Oreg.

Application July 31, 1935, Serial No.

In the Netherlands August 16, 1934 2 Claims.

The invention relates to improvements in the so-called underfeed" staking-installations.

It is known by means of a driving-mechanism, which drives a feed-screw, to push coals from a coalbunker, placed between a driving-mechanism and a combustion-chamber, to said chamber.

Inthis arrangement the coalbunker, because it is of limited capacity, .must frequently be filled according to the varying consumption of fuel,'

which is especially a drawback for central-heating-installations. It has been already proposed to make the coalbunker of very large volume, which necessitates same being placed generally rather far from the boiler, and thus necessitates a long feed-screw and which causes the drivingmechanism to be located far from the boiler. As the driving-mechanism is generally provided with a ventilator built to it. a very long air-conmay be connected to dult then exists.

The object 01' this invention is to prevent the above disadvantages and principally consists therein, that the fuel is pulled (instead of pushed) by a feed-screw from the coal-bunker to the combustion-chamber, which screw passes said chamber and is connected with the driving mechanism. Thus the feed-screw reaches at theone end into the coalbunker, while at the other end it is coupled to its driving-mechanism."

This embodiment has the advantage, that the driving-mechanism with ventilator can be placed near to the boiler, and the regulation of the fire is thereby facilitated.

In order to prevent the part of the screw between the combustion-chamber and the drivingmechanism, towards which the coals are pulled, fouling and sticking fast, according to the in- .vention an opposite handed screw, preferably with larger speed or pitch than the feed-screw, can be located to this shaft part, the supplied coals being repulsed by said opposite handed screw.

In order to remove regularly the coals under the shaft, according to the invention, a projection such as a cam or blade preferably screwshaped, can be mounted to the shaft. Instead of this cam or wedge-shaped piece can be secured to the bottom of the flrepot.

The coals then are turned of! sideways, while Dulve In order to avoid a high temperature of the flre-box-walls, according. to the invention. said fire-box is water-cooled, and the cooling-Jacket the circulation of the cen 'tral-heating-installation.

This flrepot or box consists preferably of ingotblade, for this purpose also a rizing and dust-accumulation are prevented.

iron, but it also can be made of cast-iron or other metal.

.It has been found that with such a watercooled firepot no slack aflects the metal and the slack does not set hard in front of the air-openings, but is pressed upwardly by the fresh fuel and forms itself into a' flat annulus; which lies round the firepot. With such a firepot each iuel can be stoked with high profitable efiect.

Finally according to the invention the combustion-chamber can also be water-cooled, and the cooling jacket may be connected to the central-heating installation.

This combustion-chamber can be connected by a preferably cooled main-flue with a fire door hole or an ash door hole of an existing boiler. The drawings which are in part diagrammatic illustrate the invention by way of example.-

Fig. 1 is an elevation mainly in section of a combustion-feeding and stoking-mechanism according to the invention.

Fig. 2 is an elevation partly in section showing the mechanism applied to a central'heating inwith a coalbunker located at a considerable distance therefrom as shown by the break in the coal tube.

. Fig. 3 is an elevation taken at right angles to Flg. 2.

According to the illustrated construction a feeding screw. I is mounted in a tube 2 with the one end projecting into the bottom of the coalbunker 3 (Fig. 2). This coalbunker can be at any place anddistance with regard to the combustion-chamber 4, to which the coals have to be supplied. T'he-feedscrew mechanism 5, which is near the combustionchamber 4 but on the opposite side of the combustion-chamberfrom the coalbunker 3.

The feedscrew l passes the fire-box 6, which is under the chamber 4; The feedscrew has a part 'I with a thread adapted to move the coal to the right, said part lying between the coalbunker 3 and the flrepot 6, ends. part with an opposite screwthread 8, lying between the flrepot 6 and the feeding-mechanism 5.

If the screwrotates, by the screwpart 1 from the coalbunker 3 to the flrepot 8, while the screwpart 8 takes care, that coal-dust does not penetrate into the bearing of the screw-spindle and the driving-mechanism, because it always pushes back the fuel into the firepot i. Onthe part 8 of the screw passing through the firepot 8 is a screw-shaped blade I 0, which serves to remove the coals from under the shaftpart 9 'on rotation of the screw.

l extends to a drivingthen the coals are pulled Fig. 1 further shows the air-box H, to which air can be supplied by a ventllator- 12 (Figs. 2 and 3), which air can come through openings 53 in the combustion-chamber 5 and through openings i l in the fuel in the firepot 6. In Figs. 2 and 3 the motor is denoted by it.

From Fig. 1 it is seen that the firepot 5 is provided' with a water-cooling jacket it, which by means of tubes H, can b connected to the circulation-installation of a central-heating arrangement.

The combustion-chamber 5 is located in a boiler 18 having an external wall 69 which constitutes a watercooling jacket 26, which may be connected through tubes 2i, 2% on the water circulation of a central-heating arrangement.

The watercooled combustion-chamber 8, i8, is, 213 is connected to a boiler 23 (Fig. 3) with underfeed by means of a main-flue 22, which also may be water-cooled.

Preferably the tube 23, in which the screwpart 8 between the fire-box S and the driving-mechanism 5 is located, is of air-tight construction.

The word surrounding in the claims means partially or complete surrounding.

I claimz- 1. In combination, a retort section having a curved coal passage therethru receiving coal in a horizontal direction and discharging the coal upwardly, a tuyere section adjacent the retort section to form therewith a fire-pot, a tube forming'a cylindricalspace intersecting the coal passage wall coaxially with the horizontally positloned coal receiving end of the coal passage, a worm shaft having a right line axis extending through the horizontal portion of the coal passage and also entirely through and beyond the cylinrical space which intersects the coal passage wall, and flights of opposite pitch on said worm shaft, one flight substantially fitting the horizontal portion of the coal passage and the other flight substantially fitting the cylindrical space formed by the tube so as to form a hearing for the worm shaft, and a motor for driving the worm shaft from the end extending through and beyond the cylindrical space.

2. A stoker fire-pot comprising a tuyere section and a retort section, said sections having an uywardly curved coal passageway therethru, a pipe intersecting the curved passageway at one side, a coal conduit leading to the entry end of the curved passageway and coaxial with said pipe but of larger diameter, a screw conveyor within the conduit for conveying coal from a coal storage space through said conduit to said retort section, the shaft of said screw conveyor passing through the wall of the curved passageway and extending into the pipe, a reversely directed flight on the extended portion of the shaft for preventing coal from passing through the pipe, and a motor for driving the .screw shaft from the end passing through the pipe,

1* eao onos HICOLAAS we: RUSWIJK.

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