US1817150A - Return baffle for flue doors - Google Patents

Description

Aug. 4, 1931. F. w. IHVOSLEF 1,817,150

RETURN BAFFLE FOR FLUE DOORS Filed Oct. 18. 1930 mafia: 4 4

Patented Aug. 4, 1931 UNITED STATES PATENT OFFHTE FREDR-IK W. I-IVOSLEF, OF KOELEB,

KOHLER, \VISCGNSIIQ', A. CORPORATIGII OF \VISGONSIN' RETUR-h BAFFLE FOR BLUE DOORS Application filed Qctober 18, 1939.

This invention has for its object to provide the flue door of a boiler or furnace with a return battle for deflectlng flue gases in the direction of turn of the flue passageways at that point so as to contribute to the streamline effect and thus facilitate the movement of the gases and avoid the production of corners or projections causing eddy currents.

Another object of the invention is to make such a baflie of durable and inxepensive construction and capable of secure and readv attachment to the flue door and sei protect the flue door from overhcatil WVith the above and other objects in view the invention consists in the return baflle for flue doors as herein claimed and all equivalents.

Referring to the accompanying drawings, in which like characters of reference indicate the same parts in different views,

Fig. 1 is a sectional plan view of a boiler through the flue door thereof showing a battle constructed in accordance with this invention;

Fig. 2 is a vertical sectional view on the plane of line 22 of Fig. 1, and

Fig. 3 is an inner face view of the baflle itself.

In these drawings, 10 indicates a sectional boiler of a usual type having forwardly directed side flues 11, and a rearwardly directed central return flue 12 with a common flue space 18 in the front section forming return bends connecting the side flues with the central flue and giving access to the flue spaces for cleaning through the flue door 14.

It is common practice to provide the back of the flue door with protecting plates of various types to prevent excessive loss of heat through the flue door and the purpose of this invention is to utilize such a protecting plate as a baffle conforming with the streamline of the flow of gases in making the return bend from both side flues to the central return flue. To this end the protecting plate constitutes a baflie 15, which is preferably an iron casting having two parallel cylindrically convex deflecting members 16 Serial No. 469,584.

with top and bottom rearwardly extending flanges 17 on their inner faces and with top and bottom forwardly extending flanges 18 on their outer faces.

This bafl'le is secured to the back of the flue door 14: by having openings 19 at approximately tne middle of the deflecting members 16 to receive lugs 20 projecting from the back of the flue door, as best seen in Fig. 2. I Slight projections or bosses 21 formed on the battle above and below the openings 19 to form bearing points for contacting with the inner wall of the flue door and the baiiie is held in contact at such points by the action of wedge pins 22 driven through vertical openings in the lugs 20 and guided in beveled notches 23 above and below the openings 19 and resting on projections 24. The baflle is thus securely mounted on the back of the flue door and, except for its points of contact therewith, is spaced therefrom and forms a guard for preventing overheating ofthe door.

The principal function of the baflie, however, is that of constituting deflecting surfaces in the path of the forwardly travel ling gases from the side flues 11 for directing them inwardly to the central return flue 12 with a minimum amount of resistance due to eddy currents. The double convex deflector conforms with the path of travel of the gases to present a streamline guide to exclude pockets or corners in which eddy currents may beformed and consequently the flow of gas is facilitated, improving the draft and avoiding waste of heat.

The manner of mounting the batfle on the flue door makes for a permanent connection that will resist the action of heat and that may be readily released at any time that it may be necessary or desirable and still the flue door is not marred by the presence of bolt holes and consequently may be enameled to present a neat and ornamental appearance.

What I claim as new and desire to secure by Letters Patent is:

1. A battle for flue doors comprising a plate having means for attaching it to and spacing it from the inner side of a flue door,

said plate being of curved form for de- V fleeting flue gases from one flue to another. 7 7

2. A baffle for'flue doors Comprising a plate forming a pair of contiguous concave surfaces and provided With, means for at.- taching it to and spacing it from the inner side of a flue door, said surfaces serving to conform With the direction ofcurrent of gases from side flues to a central return'flue to complete a streamline guide-therefor.-

3. In a boiler or furnace having side flues and a central return flue, a flue door giving access thereto, and a baffle comprising a piate attached to and spaced from the inner side of'tlie door and forming apair of contiguous concave surfaces conforming with the path of flow .of-gasfromfthe' side flue V r to the central return flue'to form-a streanrline guide-therefor. I

4. In a boiler or furnace "having side flues and "a central return flue, a flue door for controlling access to a, bafiie comprising a plate having two 7 contiguous cylindrical concave-surfaces at the rear, top and bottom flanges extending rearWardly-from said sur- I 1. faces, top and bottom'fianges extending for- V Wardly from the junction betweensaid surthrough openings in the cylindrical surfaces,

faces, and means for securing the plate to thejinnerside of the flue door.

5. In a boileror furnace, a flue door, a baffle comprising -a;plate having a pair of vcontiguous cylindrical concave rearwardly directed surfaces, a pair of "lugs formed on the 1111161 slde .of the flue door enter ng I spacing projections formed on the baflle ture.

plate and bearing onfthe backof theiiue door, and pinsi'; extending through openings in thelugsand holding-it in place. 7

.QIn testimony whereof ;I afiixfmy signa r I FREDRiK W. .irvosLEF.

engaging the 'ba'flle: for

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