Title:
Mechanical stoker
United States Patent 2250067


Abstract:
This invention relates to a driving device for mechanically reciprocated grates of furnaces, more especially to grates which are provided with a partitioned draft chamber below the grate bars. In grates of this character it is very difficult to seal the sectional air chambers from each other...



Inventors:
Josef, Martin
Application Number:
US26099039A
Publication Date:
07/22/1941
Filing Date:
03/10/1939
Assignee:
Josef, Martin
Primary Class:
International Classes:
F23H7/08
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Description:

This invention relates to a driving device for mechanically reciprocated grates of furnaces, more especially to grates which are provided with a partitioned draft chamber below the grate bars. In grates of this character it is very difficult to seal the sectional air chambers from each other by reason of the movement of the grate bar actuating members which pass through the partitions in the draft chamber.

The invention has for its object to construct the actuating device for the reciprocation grate bars with the simplest auxiliary means and to obtain a satisfactory seal at the places where the grate bar actuating members pass through the partitions in the draft chamber. This result is obtained according to the invention in that reciprocatory beams are employed .for supporting and moving the reciprocating grate bars, which beams extend throughout the entire space underneath the grate, and are preferably of zigzag shape sp as to pass perpendicularly in a fluid-tight manner through the partitions of the draft chamber.

An example of the construction in accordance with the invention is shown in the accompanying drawings, wherein: Fig. 1 is a longitudinal section of a furnace with a reciprocatory grate and with a partitioned draft chamber.

Fig. 2 is a cross-section of Fig. 1 on the line 2-2.

Fig. 3 shows to a larger scale the sealing device of the beam, which support the reciprocatory grate bars.

Fig. 4 illustrates a modified construction of the grate actuating beams.

The grate shown is provided with stationary grate bars I, and reciprocatory grate bars 2, which latter slide on the first. The grate bars I are supported by transverse beams 3 and the reciprocatory bars 2 by transverse beams 4. The beams 3 are arranged at right angles or approximately at right angles to the path of movement of the grate bars 2 and are attached to the upper edge of partitions 8 which are secured to the bottoms 5 of the draft chamber and form an angle other than 900 with said bottom. - Each separate section of the draft chamber is provided with an air inlet 6; provided with a regulating flap. The transverse beams 4 are secured to the upper edge of reciprocatory supporting beams 7 which are zigzag along their length, for example are of zig-zag shape, so that they pass perpendicularly through the partitions 8 of the draft chamber. It thus is possible to employ a simple permanent sealing device at the points where the beams 7 pass through the partitions 8, which sealing device consists of sliding elements 9. Each beam 1, according to the number of transversely arranged grate bar supporting beams 4 which it is to support, rests on two or more supporting rollers 10 which are mounted at suitable points.

Instead of the rollers 10 it is also possible to use links 17, in which case the beams 1 are sinuous in the form of arcs, as shown in Fig. 4 whereby the arcs which pass through the partitions 8 have radii equal to the length of the links.

The front ends of the two beams 7 are suspended from links II which are moved to and fro by a common shaft 31 through the medium of rocking levers 13 so that the beams 1 and the grate bars 2 are also moved to and fro in the direction of the coal feed. The drive of the rocking levers 13 is effected by an adjustable piston motor 14 or by any other power engine.

The speed and stroke of the reciprocating movement may be varied by regulating the driving machine 14. Under the base plate 3 each section of the draft chamber is provided with flaps 15 for the discharge of the material which falls through the grate. The extremely simple construction of the grate actuating device insures a satisfactory operation of the grate and the maintenance of the desired differences in air pressure in the individual sections of the draft chamber below the grate.

I claim: 1. In combination with a fuel advancing grate composed of alternate rows of stationary grate bars and movable grate bars, and reciprocatory beams below said grate for supporting and operating said movable grate bars, a partitioned draft chamber below said grate, said draft chamber including a bottom wall and a plurality of parallel partition walls extending upwardly from said bottom wall and transversely with respect to the longitudinal direction of the grate, said stationary grate bars being supported with one of their ends on the upper edges of said partitions and resting loosely with their other end on the movable grate bars in one of the adjacent rows, said reciprocatory beams below said grate bars extending slidably through said partitions, transverse members connecting said beams with each other and supporting one end of said movable grate bars, the other end of which rests loosely on the stationary grate bars in one of the adjacent rows, and movably mounted sealing means between said partitions and said reciprocatory beams for sealing the different sections of the draft chamber from each other.

2. In combination with a fuel advancing grate composed of alternate rows of stationary grate bars and movable grate bars, and reciprocatory beams below said grate for supporting and operating said movable grate bars, a partitioned draft chamber below the grate, said draft chamber including a bottom wall and a plurality of parallel partition walls extending upwardly from said bottom wall and transversely with respect to the longitudinal direction of the grate, said stationary grate bars pivotally being supported with one of their ends on the upper edges of said partitions and resting loosely with their other end on the movable grate bars in one of the adJacent rows, said reciprocatory beams below said grate bars extending parallel to said bottom wall and passing slidably through all of said partitions, transverse members connecting said beams with each other and pivotally supporting one end of said movable grate bars the other end of which rests loosely on the stationary grate bars in one of the adjacent rows, sealing means between said partitions and said reciprocatory beams for sealing the different sections of the draft chamber from each other, and means for supporting said reciprocable beams during their reciprocating movement.

3. In combination with a fuel advancing grate composed of alternate rows of stationary grate bars and movable grate bars, and reciprocatory beams below said grate for supporting and operating said movable grate bars, a partitioned draft chamber below said grate, said draft chamber Including a bottom wall and a plurality of parallel partition walls extending upwardly from said bottom wall and transversely with respect to the longitudinal direction of the grate, said stationary grate bars being supported with one of their ends on the upper edges of said partitions and resting loosely with their other end on the movable grate bars in one of the adjacent rows, said reciprocatory beams below said grate bars extending slidably through apertures in said partitions, transverse members connecting said beams with each other and supporting one end of said movable grate bars, the other end of of which rests loosely on the stationary grate bars in one of the adjacent rows, and sealing means between said partitions and said reciproeatory beams for sealing the different sections of the draft chamber from each other, said sealing means comprising apertured frames mounted for limited movement in their plane in the apertures of said partitions and having flanges overlapping the edges of said apertures, said beams extending perpendicularly and slidably through the aperture in said frames.

4. In combination with a fuel advancing grate composed of alternate rows of stationary grate bars and movable grate bars, and reciprocatory beams below said grate for supporting and operating said movable grate bars, a partitioned draft chamber below said grate, said draft chamber including a bottom wall and a plurality of parallel partition walls extending upwardly from said bottom wall at an angle other than 900 and transversely with respect to the fuel advancing direction of said grate, said stationary grate bars being supported with one of their ends on the upper edges of said partition walls and resting loosely with their other end on the preceding row of movable grate bars, said reciprocatory beams below said grate extending slidably through said partitions, said beams being of zigzag shape in longitudinal direction so that its portions which pass through said partitions pass perpendicularly through the same, transverse members connecting said beams with each other and supporting one end of said movable grate bars, the other end of which rests loosely on the preceding row of stationary grate bars, and movably mounted sealing means between said partitions and said reciprocatory beams for sealing the different sections of the draft chamber from each other. o 5. In combination with a fuel advancing grate composed of alternate rows of stationary grate bars and movable grate bars, and reciprocatory beams below said grate for supporting and operating said movable grate bars, a partitioned draft chamber below said grate, said draft chamber including a bottom wall and a plurality of parallel partition walls extending upwardly from said bottom wall at an angle other than 900 and transversely with respect to the fuel advancing direction of said grate, said stationary grate bars being supported with one of their ends on the upper edges of said partition walls and resting loosely with their other end on the preceding row of movable grate bars, said reciprocatory beams below said grate extending slidably through said partitions, said beams being of zigzag shape in longitudinal direction so that its portions which pass through said partitions pass perpendicularly through the same, transverse members connecting said beams with each other and supporting one end of said movable grate bars, the other end of which rests loosely on the preceding row of stationary grate bars, sealing means between said partitions and said reciprocatory beams for sealing the different sections of the draft chamber from each other, and means on said bottom wall of the draft chamber for supporting said reciprocatory beams during their reciprocating movement.

6. In combination with a fuel advancing grate composed of alternate rows of stationary grate bars and movable grate bars, and reciprocatory beams below said grate for supporting and operating said movable grate bars, a partitioned draft chamber below said grate, said draft chamber including a bottom wall and a plurality of parallel partition walls extending upwardly from said bottom wall at an angle other than 900 and transversely with respect to the fuel advancing direction of said grate, said stationary grate bars being supported with one of their ends on the upper edges of said partition walls and resting loosely with their other end on the preceding row of movable grate bars, said reciprocatory beams below said grate extending slidably through apertures in said partitions, said beams being of zigzag shape in longitudinal direction so that its portions which pass through said partitions pass perpendicularly through the same, transverse members connecting said beams with each other and supporting one end of said mov-. able grate bars, the other end of which rests loosely on the preceding row of stationary grate bars, sealing means between said partitions and said reciprocatory beams for sealing the different sections of the draft chamber from each other, and means on said bottom wall of the draft chamber for supporting said reciprocatory beams during their reciprocating movement, said sealing means comprising apertured frames mounted for limited movement in their plane in the apertures of said partitions and having flanges overlapping the edges of said apertures, said beams extending perpendicularly and slidably through the aperture in said frames.

7. In combination with a fuel advancing grate composed of alternate rows of stationary grate bars and movable grate bars, and reciprocatory beams below said grate for supporting and operating said movable grate bars. a partitioned draft chamber below said grate, said draft chamber including a bottom wall and a plurality of parallel partition walls extending upwardly from said bottom wall at an angle other than 90" and transversely with respect to the fuel advancing direction of said grate, said stationary grate bars being supported with one of their ends on the upper edges of said partition walls and resting loosely with their other end on the preceding row of movable grate bars, said reciprocatory beams below said grate extending slidably through said partitions, said beams being sinuous in longitudinal direction so, that its portions which pass through said partitions pass perpendicularly through the same, transverse members connecting said beams with each other-and supporting one end of said movable grate bars, the other end of which rests loosely on the preceding row of stationary grate bars, and sealing means between said partitions and said reciprocatory beams for sealing the different sections of the draft chamber from each other, and links for_ pivotally connecting said reciprocatory bars with said bottom wall for supporting said bars in said draft chamber.

JOSEF MARTIN.