US114158A - Improvement in tuyeres for cupola-furnaces - Google Patents

Description

F. LAWRENCE. Improvement in Tuyeres for Cupola-Furnaces.

Patented April 25,1871.

WITNESSESE Z Z dinitdi $3125 FRANKLIN LAWRENCE, OF PHILADELPHIA, PENNSYLVANIA.

Letters Patent No.114,158, dated April 25, 1811.

IMPROVEMENT IN TUVERES FOR CUPOLA-FURNACES.

The Schedule referred to in these Letters Patent and making part of the lame.

I, FRANKLIN L'AwnnNon, of Philadelphia, county of Philadelphia, State of Pennsylvania, have invented an Improved 'luyere for Gupola-Furnaees, of which the following is a specification.

Nature and Object of the Invention.

My invention consists of a ,castiron tuyere made in the peculiar manner too fully explained hereafter to need preliminary description, for the purpose of introducing into the furnace blasts of a more efiicient character than are forced into ordinary furnaces of this class, and for the purpose of afibrdin g facilities for build ng the said tuyeres into the wall of the furnace.

Description of the Accompanying Drawing.

Figure 1 is a vertical section of part of a cupolafurnace illustrating my improved tuyeres Figure 2, a sectional plan on the line- 1 2, fig. 1; and

Figure 3, a perspective view of one of the tuyeres.

General Description.

A is the base plate of the cnpola, supported by brackets on columns B in the usual manner, and

Dis the brick lining of the furnace, inolosed by a casing, E, which extends to the base plate A, the in terior of the furnace being contracted at the lower end as usual, and an annular blast-chamber, F, being formed around this contracted portion of the furnace.

My improved tuyeres will be best understood by rel'erring to the perspective view, fig. 3, each tuyere being made of cast-iron and of the peculiar shape there shown-that is, with a large square base, a, united to and forming a part of the contracted upper portion 11 of the same length as the base, in which is the large iuyercdiole d, the contracted portion having atuyereliolevvhich deci easesiwwidth firom the bottom upward,

and which may be subdivided into any desired number of separate holes by webs or partitions e e, the sole object of 'which, however, is to strengthen the casting.

These tuyeres are built in the'lining of the contracted portion of the furnace, as shown infigs. 1 and 2, their holes forming the sole communication between the blast-chamber F and the interior of the furnace.

I have found by repeated and long-continued experiments that by so arranging. the tuyeres of cupolafurnaces that the volume of compressed air forced into the furnace is greater below than above, the effect as regards the reduction of the metal is much more rapid than when the blast is admitted in the usual manner through round holes; and in carrying out this principle I have found that cast-iron tnyeres of the form shown in fig. 3 are both efficient and economical, for while the holes are so arranged that the blast through them decreases in volume from the base upward, the exterior of the tuyeres is of such shape as to admit of their being easily built in and form a part of the lining.

It should be understood that the tuyeres do not extend quite to the inner surface of the lining, but that they are there protected by a layer of clay.

Claim.

witnesses.

V FRANK. LAWRENCE. Witnesses: l

WM. A. STEEL,

HARRY SMITH.

Images