Specification of Charles Samuel Walker and Robert Hoyle : apparatus for consuming smoke, and preventing the explosion of steam boilers.

  • Walker, Charles Samuel.
Date:
1860
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Charles Samuel Walker and Robert Hoyle : apparatus for consuming smoke, and preventing the explosion of steam boilers. Source: Wellcome Collection.

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    Walker ^ Hoyles Impts. in Machinery for the Consumption of Smoke, excentrics Z, the hinge pin of each fire door c being provided with one excentric; to the shaft i, are also fixed the levers m, to which one end of the link n is jointed, the other end being connected to the swivel door, damper, or valve 0, which is hinged in an opening provided for it in the front part ¥ of the bridge. The door o^ is also hinged in the same opening as the damper o; 5 this door o^ is made of wire work, or otherwise perforated for the purpose of dividing the air entering between the front part and back part of the bridge. The mode of operation is as follows : —When the furnace door c is opened to feed the fire with fresh fuel, the excentric I, acting on the horizontal lever k and vertical lever causes the shaft i to swivel partly round, and in 10 so doing the damper o is opened by the lever m and link n; the piston g is at the same time raised from the lower to the upper end of the cylinder f, and while the piston g is rising, the valve g^ admits air or other fluid into the cylinder. As soon as the door c is closed the excentric I ceases to act on the lever k, and the piston g is at liberty to descend in the cylinder / at a speed 15 varying according to the size of the orifice in the screw tap g’^, through which the air or other fluid escapes from the cylinder; and as the damper o is ^con¬ nected to the piston g by the levers and other parts above enumerated, it is evident that the damper o will be closed more or less rapidly according to the size of the orifice in the tap or the damper o may be kept closed until 20 the fuel has been put on the fire and opened by the closing of the furnace door c. By means of these improvements in machinery or apparatus for promoting the consumption of smoke in steam boiler or other furnaces, a fresh supply of air is admitted between the bridges and W every time the furnace door is 25 opened or closed, and this supply is gradually cut off by the descent of the piston g in proportion to the reduced quantity of smoke evolved by the coal. The fresh air, after passing the damper o, is divided into small streams by the . perforated door o’, which is hinged at o^ for the purpose of being able to clean out the space between the bridges. When more than two bridges are employed, the air can be heated before is admitted into the flue. In loco¬ motive steam engines the air is admitted into the smoke box by a similar arrangement of machinery. Our improvements in machinery for preventing the explosion of steam boilers consist in the following parts:—p is a dial attached to the front of the 35 boiler, and q is an index fixed to the spindle or shaft r, to which is fixed the cam and pinion ; this pinion gears in the segment s, forming part of the float lever s^; the fulcrum stud of this lever and the end of the shaft r are supported in a cross stay or other convenient fixture attached inside the boiler.