US1673018A - Valve for reversing furnaces - Google Patents

Description

June 12, 1928. I H. C. 'PERDUE VALYE FOR REVERSING FURNACES Filed Aug. 24, 1925 HENRY C Fara/.5

fl 6mm;

Patented June 12, 1.928.

UNITED STATES PATENT'OFFICE.

HENRY G. PE RDUE, 0F HIGHLAND PARK, MICHIGAN, ASSIGNOB 0F ONE-HALF T9 WILLIAM ROBERT WILSON, 01" DETROIT, MICHIGAN,

1 vALvn roa nnvnnsiivernnnacns.

ap iicmon area August 24, 1925. Serial in. 51,963.

which tends to eliminate the necessity for lifting heavy parts, and at the same time one that will hold up under heavy duty.

Another object of my invention is to pro vide a three-way valve, for use in reversing furnaces so constructed that theniain valve water seal remains constant. while a port' seal, constructed to permitreversal is normally sealed in asetfective a manner as the main valve seal; that is to say. the portseal is the only seal broken, or in any way modi fied at the time of reversal. so that an efl ective and constant seal is always had to.

prevent explosion or outward escape of gas. VVitbtheseandother ob ects in View, my

' invention consists in the arrangement, combination and construction of the various parts of my improved device. as described in the specification, claimed in my claims and shownin the accompanying drawing.

Fig. 1 isa plan sectional view of my im proved device taken on line .L IJofFig. 2.

F ig. 2 is a cross sectional View ofmy improved device taken on line 2-2 ofFig. 1.

I have shown, more or less diagrammatically. a foundation 1.0 of a conventionalstack flue 11, a conventional gas passage 12 and a conventional furnace port13, asused in a reversing type furnace, using a three-ported valve. l

side circular wall 15 and inner walls 16 around the edges of the ports 11, 12 and 13. The walls 15 and 16 forman outside trough 2O with troughs 21 leading therefrom and terminating at a common point, as in the center 22 of the base 10.

A cross member 23 is suspended over the base 14 by the beams 24 that are secured. to the projections 25 of the base. Positioned, on a ball connection, in a member 1.9 on the base 14, and extending through and above the member 23, is a shaft 26 that is mounted for rotation in a bearing casting 27. as well as a ball connection96. A valve hood 29 having a top 28 the outside wall 97 A valvebase 14 is'provided having an outand the inner walls 98 and 99 extending from the center 22 to the wall 97 is connected to the shaft 26, so as to rotate therewith. The bottom edges of the hood extend partially into the trough 20 to form a water seal. A smaller hood 34, havinga short outer vertical shell 35, and a long inner vertical shell 36 is shown as covering the stack flue 11. Atrough 31 is formed by a member 33, which is L shaped in. cross section, se cured to the inside of a section of the wall a 97 and outside of walls 98 and 99. The shell 35 fits into tbetrough 31 and the shell 36 extends down into the troughs 20 and 21, around the wall. 16 of the flue 11.

Stop plates 37 adapted to strike the beams 24, are placed on the hood 29 to prevent complete rotation thereof and to aid in positioning the small hood 34 over either the flue 11 or the passage 12.

Fulcrumed on the shaft 26, as at 95, by 1 means of a block 38 fixed to the shaft, is a lever 40 that has an adjustable balance weight 41 on the end 42 thereof. A. vertical lever 43 is pivoted at one end to the end 44 of the lever 40 and on the other end to a T plate 45, secured to the center of the small hood 34.

In the practical use of my improved device, water 46 is placed in the troughs 20 and 21 to form an air tight seal for the valve hood 29, and also in the trough 31 to form a seal-for the small hood 34. In the admission of gas into the furnace, as shown in Fig. 1, the small hood 34 is placed over the stack flue 11, so thatthe shell 36 extends into the water in troughs 20 and 21 around the wall 16v of the stack and the shell 35 is placed in the water in the trough 31, thus forming a double seal, which completely closes the'stack opening. At the same time. the large hood29 permits the How of gas from the passage 12 into the furnace port 13.

When it is desired to stop the flow of gas and open the furnace to the stack 11., enough pressure is placed on the end 42 of thelever 40 to lift the hood 34 far enough so that the shell 36 clears the wall 16 of the stack flue 11, but notenoughto break the water seal of the shell 35 in the trough 31. The hoods 29 and 34 and the lever 40 are then rotated with the shaft 26 until. stopped by one of the plates 37 bearing against one of the beams 24. Inasmuch as the botton edges of the walls 98 and 99 extend only to the level of the trough 31, it will be readily appreciated that they clear the tops of openings 12 and 13 when the hood 29 is rotated. The pressure on the end 42 of the lever 40 is then released, thus allowing the hood 34 to lower so that the shell 36 thereof will completely surround the wall 16 of the gas flue, and be again sealed by the water in the troughs 20 and 21.

It will be noted from the foregoing, that in this manner, I provide a three-way reversing valve that has an air ti ht seal at all times formed by the water in tie troughs 20, 21 and 31, this seal not being reduced or in any manner lessened while reversing. It will further be apparent that the reversal is obtained without the necessity of lifting heavy parts of the mechanism.

I have not here shown any specific means for raising and lowering the lever 40, nor for rotating it and the parts connected with it, inasmuch as any mechanism wellknown in the art may be used for this purpose.

It is obvious that various changes may be made in the arrangement, combination and construction of the various parts of my improved device, without departing from the spirit of my invention, and it is my intentlon to cover by my claims such changes as may be reasonably included within the scope thereof What I claim is:

1. In combination, three openings, a rotata'ble hood positioned over two of said openings, a liquid seal for the bottom edge of said hood, a second hood positioned over the third opening, and sealed in said liquid seal, a shell secured to said second hood, a liquid seal for said shell of greater depth than said first seal, means for lifting said second hood to clear said third opening and thereby break its seal with said first liquid seal, means of rotating the hoods to permit the second hood to center over one of said first two openings and said first hood to position over the other two openings, said seal of said shell remaining unbroken throughout said shifting and raising of said second hood.

2. In combination, a base having rimmed openings therein, a shaft extended upwardly from said base, a hood secured to said shaft and covering certain of said 0 enings, a second hood covering other of sai openings, liquid seals for the bottoms of said hoods, a depending shell from said second hood having a liquid seal for the bottom thereof, means for lifting said second hood and breakin its liquid seal, means for rotating sai: hoods, to locate said second hood over an opening previously covered by said first hood and to cover the openings previously covered by said second hood with said first hood, and means for lowering said second hood over its new opening and engaging the bottom thereof in a liquid seal.

I 3. In a device of the class described, comprising a hood having an opening therein, a liquid seal around said opening, a second hood having an outer shell depended there y from and means adapted to place said second hood over and into said openin said shell being positioned in the li uld sea 4. In a device of the c ass described, com prising a hood having an opening therein, a rimmed port, a second hood covering said openin and having a depending portion extending through said opening surrounding the rim of said port, a liquid seal for the bottom of said depending portion, a shell depended from said second hood, surround-v ing said depending portion, a liquid seal around the oienin bottom of sai shel means for lifting said second hood above said rim and thereby breaking its seal, said shell seal being of sufficient depth to remain unbroken during such lifting.

5. In combination, rimmed ports, a rotatable hood having an opening therein posit-ioned around said ports, a liquid seal for the bottom of said hood, 9. second hood having a portion thereof extending through the opening in said first hood into said water seal and having its bottom surrounding one of said rims, a shell depended from said second hood, a waterseal from the bottom of said shell around the opening in said first hood, and means for lifting said second hood to clear said, rimmed ports and to break the water seal thereof, the seal for said shell remaining unbroken during such lifting.

HENRY C. PERDUE.

in first hood for the

Images