US2858806A - Heating boilers - Google Patents

Description

Nov. 4, 1958 P. sTucKLlN HEATING BOILERS Filed May 14, 195e INVENTOR vPAUL STUCKLIN M,W#u

United States lPatent C p z,sss,s06

HEATiNG BorLERs Paul Stucklin, Basel, Switzerland, assignor to Stucklin & Cie, a Swiss company Application May 14, 1956, Serial No. 584,519

Claims priority, application Switzerland March 2S, 1956 I 4 Claims. (Cl.` 122-82) This invention relates to a heating boiler comprising a front combustion chamber, a rear'heat exchange chamber having a flue gas inlet to receive flue gases from said combustion chamber and a ue gas outlet, and a plurality of pockets arranged in said heat exchange chamber and exposed to said flue gases and having open lower and upper ends to permit of a circulation of a liquid therethrough by convection.v According to the invention that heating boiler is characterized in that said pockets are of wedge-shaped horizontal section and face the combustion chamber with their larger ends to form a pocket bank converging from said combustion chamber. v

An illustrative embodiment of the invention is shown on the accomanying drawing, in which Fig. l is a mainly sectional side view of the heating boiler; and

Fig. 2 is a horizontal sectional view taken on line II-II of Fig. l.

The heating boiler shown in Figs. l and 2 has a front combustion chamber 1, into which the ame tube of an oil burner 2 extends, and a heat exchange chamber 3 which lies behind the combustion chamber and has an oval outline together with the latter A partition 4 of refractory bricks is provided between these two chambers and is formed in its u-pper part with a flue gas opening 4a. The heat exchange chamber 3 contains pockets 5, which may be provided at their lower ends with discharge taps and form a pocket bank converging from the partition 4. These pockets 5 are wedge-shaped in horizontal section and face the combustion chamber with their rounded larger ends. The spaces between adjacent pockets are of uniform width from the front to the rear. The two chambers 3 and y4 are covered at the top by a cover plate 7, which is formed in its rear half with slots 7a registering with the pockets 5 in arrangement and cross-sectional shape. The pockets are welded at their upper edge portion into said slots. Thus the cover plate and pockets form a single body, which is arranged so that the pockets 5 depend in theheat exchange chamber 3 and extend almost to the bottom of the same. A closing wall 8 provided at the end of the pocket bank adjacent to the partition 4 is formed with slots corresponding to the large ends of the pockets 5 and is welded to said pockets. Arcuate lateral external walls 9 and 10 and the side walls of the comj bustion and heat exchange chambers form crescentshaped water chambers 9a and 10a, which communicate with a top water chamber formed by the cover plate 7 and the cover-like top 11 of the boiler and extend throughout the area included by the two external walls 9 and 10. Outlet and inlet pipe connections 12 and 13 respectively are provided at the rear end of the top 11 of the boiler. The inlet pipe connection 13 is disposed somewhat' below the outlet pipe connection and is continued at its inner end by a pipe 13a, which extends through a transverse wall 14 extending above lthe combustion chamber 1 throughout the width thereof.

2,858,806 Patented Nov. 4, 1958 This transverse wall 14 divides the top water chamber into a front part communicating with the front parts of the crescent-shaped water chambers 9a and 10a and a rear part communicating with the rear parts of the crescent-shaped water chambers 9a and 10a and with the upper ends of the pockets 5.

The rear end of the heat exchange chamber 3 is formed by a rear wall 14a, which is detachably arranged so that its removal provides a cleaning hole through which the pockets 5 can be conveniently cleaned on the outside owing to their special shape and arrangement.

When the bolier is to be coal-fired and a door is replaced for the oil burner 2, the refractory brick lining of the combustion chamber 1 as well as the partition 4 are eliminated.

In the operation. of the boiler the returning colder water ows over that part of the cover plate 7 which form the heating surface exposed to the highest radiation temperature. Thus condensation in the combustion chamber side by the cooled returning water is avoided. From there the water ows to the crescentshaped water chambers 9a and 10a, where it subsides and mixes with the `hotter water therein. From these chambers the water ows to the rear part of the pockets 5, subsides in the same and rises in the front part of the pockets, near the combustion chamber. It is thus apparent that the cooled returning water is preheated before it enters the pockets, whose external heating surfaces are contacted by the cooled ue gases, whereby condensation is prevented. The heated water flows then in the usual manner to the outlet pipe connection 12.

Forming a converging pocket bank the pockets 5 of wedge-shaped cross section provide an optimum overall heating surface within an extremely small space. After the rear wall 14a has been removed they can be xcleaned on the outside through a relatively narrow cleaning hole. The streamlined shape of the pockets provides for an aerodynamical ow of the flue gases without impact and turbulence, whereby pulsation at the beginning of the operation ofthe oil burner is avoided. The llue gases entering the heat exchange chamber at the upper part of the pockets impinge on heating surfaces on which lime and mud will not deposit. Finally, the manufacturing costs of that boiler are less than those of boilers of the same capacity and of different design.

I claim:

l. A water heating boiler comprising a front cornbustion chamber, a rear heat exchange chamber having a flue inlet from said combustion chamber and a llue outlet, and a plurality of vertically disposed heat exchange pockets each having a wedge-shaped hoizontal cross section and being closed at the bottom ends and connected to the boiler water supply at the tops thereof, said pockets being positioned in said heat exchange chamber with the wide edges of said pockets facing said flue inlet and the narrow edges toward said ue outlet and said pockets being spaced laterally from each other and forming a plurality of passages therebetween the ends of which are closer to each other toward said flue outlet.

2. A water heating boiler comprising means forming a front combustion chamber, a rear heat exchange chamber having a llue inlet from said combustion chamber and a ue outlet, said combustion chamber and said heat exchange chamber being adjacent each other and having an oval horizontal cross section, the walls defining said chambers being curved, outer curved walls spaced from chamber walls and dening crescentshaped water chambers with said curved walls of said combustion chamber and heat exchange chambers, one`v wedgefshaped apertures therein, a top on said boiler spaced from said cover plate and joined to said outer walls and defining with said cover plate a top water chamber, a transverse wall extending across said top water chamber dividing it into a front portion over said combustion chamber and-a rear portion over said heat exchange chamber, said crescent-shaped water chambers being connected to said front and rear portions of said top water chamber-,'said front portion of said top water chamber having an inlet thereto and the rear portion of said` top water chamber having an outlet therefrom, and a plurality of vertically disposed heat exchange pockets each having a wedge-shaped horizontal cross section and. being closed at the bottom ends and connected tov said cover plate at the tops thereof and opening into said top water: chamber through said openings in said cover plate, said pockets being positioned in said heat exchange chamber with the wide edges of said pockets facing said-Hue inlet and the narrow edges toward said ue outlet and said pockets being spaced laterally from each other and forming a plurality of passages therebetween the ends of which are closer to each other toward said iiue outlet.

3. A heating boiler as set forth in claim 2, and an outlet pipe connection and an inlet pipe connection carried by the rear upper portion of the boiler, and a conduit connecting said inlet pipe connection to said inlet of the front portion of said top water chamber,

' said outlet pipe connection communicating with said 'rear part of said top water chamber.

4. A heating boiler as set forth in claim 2, a removable wall adjacent thenarrow edges of said heat exchange pockets at the rear endv of said heat exchange chamber.

References Cited inthe iiletn4 this patent UNITED STATES PATENTS

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