US2200558A - Vertical sand damper - Google Patents

Description

Z w F W. S. MAYERS VERTICAL SAND DAMPER Filed Oct. 29, 1937 May 14, 1940.

IN VENTOR @Wdywu.

Patented May 14, 1940 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to dampersor valves for shutting off and re-establishing the current of hot gas in the mains and branches of conduits leading from gas producers to the various combustionchambers, or hot gases from combustion chambers, and is designed to be used in horizontal pipes or conduits.

The invention embraces an improvement in the construction of the sand dampers described and shown in Letters Patent No. 1,663,915 issued to me on March 27, 1928, to which reference is made.

In the practical use of these sand dampers it occurs that the closure plate in contact with the hot gas sometimes adheres to its seat (life to the formation of a burned tar deposit between the seat and the plate so that it is difficult or impossible to raise the plate without first jarring it loose.

To overcome this difiiculty my object is to provide means for inserting a pointed bar under the edges of both plates by which they may be jarred loose and the tar seal broken.

A further object of the invention resides in the use of double doors hinged at their adjacent ends near the vertical center line of the cast iron body. The section of the iron rim at this point and the extra wide connecting flanges, all integral parts of the main castings, provide strong tie members for resisting the mechanical strains caused by the sagging of the heavy conduits which are thereto attached. With a single door having a length equivalent to that of the two doors it is evident that the parts would have considerably less strength in resisting the strains due to sagging at the point where strength is most needed. Furthermore the double doors permit the casting of the body in two sections, the joint being in the vertical axial centerplane as shown. As all parts of the sand damper body on one side of the vertical centerplane are symmetrical with such parts on the other side it is necessary to construct only a half pattern, thus reducing the cost of manufacture.

The drawing shows the body split also on the horizontal axial centerplane. This is recommended only for the large sizes which are fitted to conduits of from six to ten feet in diameter.

Referring to the drawing, Fig. 1 is a section through the radial centerplane II in Fig. 2; Fig. 2 is a section through the vertical axial centerplane 2-2 in Fig. 1; Fig. 3 is an enlarged section on the line 3-3 in Fig. 1 and Fig. 4 is a perspective view of the loose cover plate forming the top closure after the damper plates are withdrawn. I

The sand damper is shown in its complete form comprising the cast iron body I as a unit in quarter sections, the hoist frame 2, the plates 3, 4, the winch '5, the sheaves 6, I, 8, 9, the cable Ill, II, the counterweight I2 and the loose cover plate I3.

The seats Ia, lb are offset in sections as shown so that a pointed bar I4, indicated by dotted lines in Fig. 3, may be inserted for prying the plate loose from its seat. The bar may also be used for this purpose through the poke holes I5 after the plugs I6 are removed and also through the channels I1, I8 from above.

In Fig. 1 the damper is shown with the plates hoisted to the open position and resting upon a loose piece of steel channel I9 which is placed upon the curbs I c, I d of the enlarged top of the damper body. In order to stabilize the plates while thus supported, with the hoisting cable II slack, the holding angles 20, 2| are attached to the main frame angles through the gusset plates 22, 23. Attached to the gusset plates are the short angle guides 24, 25, the inwardly extending legs being cut as shown to facilitate the entry of the plates between them.

For stabilizing the plates in the crosswise direction the steel bars 25, 21 are inserted in holes through the main angle supports and gusset plates.

With the damper open, as in Fig. 1, the loose cover plate I3 is placed in the enlarged top of the body casting and covered with sand to a depth of a few inches.

When it is desired to close the damper the plates are first hoisted by the winch 5 to their topmost position which is followed by the removal of the sand cover and the channel I9 and cover plate I 3. The plates are then lowered to their closed position within the body and the space between them and the enlarged top filled with sand.

The damper plates are connected together at their tops only through the inverted U shape yoke 28 which has suflicient resiliency to permit them to be sprung inwardly a short distance from their seats for the purpose above described.

The doors 29, 30' are hinged at their adjacent ends near the center of the damper body so that when open they are held back to back by gravity in which position they do not impede the digging out of the sand seal. They are held when closed by the threaded nuts on the swing bolts 3|, 32.

A multiplicity of holes, not shown, extend around the rims le, If at equal spacing for receiving bolts or rivets which bind the shells of the conduits to the rims in a well known manner.

When the conduit is to have a refractory lining, which it usually has, the brick or blocks may abut the seat flanges la, lb and in preferable construction the inside diameter of these flanges is somewhat less than the inside diameter of the refractory lining in order that the edges of the flanges may be protected from direct contact with the hot gases.

When the plates 3, 4 are lowered into their closed position a close fit against their respective seats is not essential since the seal is effected by the sand diaphragm which completely fills the space between the plates as well as the enlarged portion at the top of the damper body. Being somewhat moist when placed in the damper the sand will not run through narrow interstices between the plates and their seats and the webs of sand which are exposed to the hot gas soon become set, due to the tar which is suspended in small particles in the gas.

I claim:

In a sand damper, a casing having opposed spaced sides, and provided with a plurality of spaced openings, each side formed with an uninterrupted integral seat, which extends inwardly in the space between the sides, a slide composed of spaced plates engageable with the respective seats, and means to resiliently connect the plates so that same can freely move inwardly of the casing, said plates extending outwardly beyond the outer terminals of the seats throughout the circumference of the latter and the seats being of such width as to hold the plates of the slide at such predetermined spaced distance from the inner faces of the sides of the casing as to provide for the insertion of a prying tool of a size so as to enable the plates to be pried out of engagement with the seats, and the bounding edges of the plates being located in such relation to the bounding edges of the sides of the casing, whereby such latter edges provide a fulcrum for the prying tool, the openings of the casing being located at the top and bottom and on opposite sides thereof, whereby the plates may be pried away from their respective seats throughout substantially the circumferences of the plates.

WILBUR S. MAYERS.

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