US1940973A - Steam generating boiler - Google Patents

Description

Filed Nov. 2, 1931 3 Sheets-Sheet l \W ru fmw WM 1 g m w: \m M a n A ORNEY.

1933- R. A. SHARP STEAM GENERATING BOILER 3 Sheets-Sheet 2 Filed Nov. 2, 1931 INVENTOR. fl m mfl i /p ATTORNEY.

Dec. 26, 1933. R. A. SHARP 1,940,973

STEAM GENERATING BOILER 3 Sheets-Sheet 3 Filed Nov. 2, 1931 INVENTOR.

Ewan/H ig/ p D N BY 1 :2

ATTORNEY.

Patented Dec. 26, 1933 M Y 3 UNITED; STATES- PATENT OFFICE.

I STEAM; GENERATING BOILER Richard A. Sharp,'Milwaukee Wis assignor to Milwaukee Reliance Boiler Works, Milwaukee Wis, a corporation of Wisconsin U Application November 2, 1931. Serial No. 572,602

5 Claims. (o1. -122-149 This invention relates to certain new and useful improvements in steam generating boilers and has particular reference to fire tube boilers and to provide a construction facilitating inspec tion and replacement of parts when necessary.

Another object of this invention is to provide novel baffle means for directing the heating medium back and forth through the tubes of the boiler.

Another object of this invention resides in the provision of means for readily removably mounting the bafiles so as to facilitate their replacement when necessary.

Another object of this invention resides in the particular construction of the end vplates which cooperate with the bafiles'to provide. spaced chambers with which the ends of the tubes communicate to direct the heating medium from one set of tubes to another.

Another-object of this invention is to providenovelmeans for returning condensate to a boiler and inthis connection it is a more specific ob ject of this invention to provide means whereby the pressure within a condensate return'chamber andthe boiler'may'be' equalizedto enablethe condensate to flow bygravity back into the boiler.

7 With the above and other objects in view which will appear as the description proceeds, thisin' vention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and'more particularly defined by the appended claims, it beingunder stood that such changes in the precise embodi-' ment of the herein disclosed invention may be made as come within the scope of the claims.

In the accompanying'drawings, one complete example of the physical embodiment of this invention is illustrated constructed according to the best mode so far devised for the practical application of the principles'thereof, and in which:

a longitudinal section view taken from the location of the header plates 12 and 13 panyine d awin s; he nume al 5. represents. the

outer cylindrical shell of the boiler. I Fixed to the inside endportion's of the cylindrical shell are rings 6 and 'land' secured to the inner peripheries of the rings 6 andil areshort cylinder sections 8 and,9 respectively. The rings 6 and 7 6o spacethe short cylinder sections 8 and 9 from the inner Wall of the shellandi thus. afiord an annular space entirely surroundingthe'short cylinder sections I a i The innerends of the cylindersections Band 9 have lateral flanges l0 and 11 formed on header plates 12 and 13, respectively,- secured thereto, and the header plates 12 and'13 are connected by a pluralityof tubes 14., The short cylinder sections 8 and 9 thus position theheader plates 12 and 7c.

' 13 inwardly from the outer ends of the main hell 5 and the space thus provided isutiliz'ed, in the manner to be later described, to communicate the different sets of tubes 14.

The header plate 12 has an opening 15 of con- '15 sider'able size above the longitudinal ma jor'axis I of the boiler, andfixed to the header plate about theperiphery of the opening 15 is a cylinder 16. The length of the cylinder 16 is substantially equal to that, of the cylinder section Sand its outer end portion is welded orotherwise secured toa ring 1'7 positioned within itsouterend porti'o'n.1..The inner'peripheryof. the ring 17 has one end portionof a tube 18 welded or otherwise secured thereto, and this tube extends into the boiler with its outer'wall adjacent the cylinder 16 spaced therefrom by the ring 17, and has'its opposite end passed through an opening 19 in the headerplate13'to besecured thereto as at 20.

. The header plates Hand 13 and the tubes 14 9.0 and 18 together with the shell 5 thus providea closedchamber into which wateror other material to be heated may be conducted through an inlet pipe 21 at the bottom ofthe shell. A second pipe 22 opening into tliebottom of the shell provides a d'rainto permit the contentsof the boiler to be withdrawn. 7 I. v .7 Thespaces atthe-ends of the boiler resulting position. Anopening 30iseccentrica1ly formed in the plate 27;to align withgthe'adjacent open endllo like (not shown).

of the tube 18 and provide an entrance to the tube.

A second opening 31 provided with an external collar 32, is formed in the lower portion of the plate 27 for the connection of an exhaust flue, not shown, to conduct the exhaust gases from the lower portion of the chamber 23, as will be later described.

The inner surface of the plate 27' from a short distance above the opening 31 is covered by a layer of refractory material 33, held in position by an outer flange 34 extended inwardly from the surface of the plate 2'? and an inner flange 35 similarly mounted on the inner surface of the plate. The inner flange is round and of sufficient diameter to receive the adjacent end of the cylinder 16 and the outer flange 34 has its lower portion extending in a straight line at right angles to an axis intersecting the axes of the openings 30 and 31.

The end wall 26 which closes the chamber 24 at the opposite end of the boiler, comprises a circular plate 36 provided at its peripheral edge with an annular flange 37. The plate 36 and consequently the flange 37 is of a diameter less than the inside diameter of the cylinder section 9 to permit the flange 37 to enter its outer end. A lateral flange 38 encircles the central portion of the flange 37 and overlies the outer surface of the ring '7 to be secured thereto by studs 39 passed through suitable openings 40 in the flange 38.

At a short distance beneath the center of the plate 36 a flat wall 41 extends as a chord from one side of the annular flange 3'? to the other. This flat Wall 41 is of the same height as the annular flange 3'7 and cooperates therewith to retain a layer of refractory material 42 on the inner surface of the plate 36. Two or more vertical ribs 43 extend across the space beneath the wall 41 to the adjacent lower portions of the annular flange 37 to increase the rigidly of the uncovered portion of the plate 36 and assist the wall 41 in supporting the refractory material.

The chambers 23 and 24 together with the communicating tubes 14 and the tube 18 form. connected passages through which any suitable heating medium may be circulated. The tube 13may be considered a combustion chamber as it re ceives the initial blast of the heating medium whichimay be produced by an oil burner or the The heated gases and flame travel through the tube 13 into the chamber 24 where they impinge the layer of refractory material 42.

A back and forth passage of the heated gases through the tubes 14 is induced by baflies disposed in the chambers 23 and 24; The chamber 24 has a bafiie 44 located directly beneath the tube 18, andinasmuch as the baffles are subjected to intense heat, it is desirable that they be replaceable. In the presentinstance the baifle 44 comprises a layer of refractory material 45 carried by a metal bridge member 46 preferably T shaped in cross section. The ends of the Shaped bndge member engage me curved surface the chamber. 7 The levelof the liquid within the of the cylinder 9 to support the bridge piece and to preclude-movement of the bridge piece out of itsproper position, the ends of its vertical flange are received between spaced blocks'47 welded or otherwise fixed to the inner wall of the cylinder section 9.

It is thus seen that the bafile 44 is readily removable, and inasmuch as it extends across the width of the chamber 24 from the header 7 v plate 13 to the adjacent face of the refractory 1 material 42 carried by the end plate 26 it divides the chamber 24, directly beneath its communication with the tube 18, into upper and lower compartments.

The heating medium issuing from the tube 18, thus entersthe upper compartment, and it is observed, that the forward upper edge of the refractory layer is rounded as at 48 to deflect the heating medium' upwardly. From this upper chamber the heating medium is conducted to the chamber 23 through those tubes 14 disposed above the baflle 44 and'which may be considered a first set of tubes.

The chamber 23 also has a baflie 49 to again deflect the heated gases through a second set of tubes which are those communicated with the chamber 24 beneath the bailie 44 and communicated with the chamber 23 above the baffle 49, back into the chamber 24. Like the baille 44, the baffle 49 comprises a body of refractory material 50 supported on a substantially T shaped bridge piece 51. The bridge piece 51 has its ends resting on the cylindrical inner surface of the cylinder section 8 to support the bafl'le and is ice It is observed'that the baiiie 49 conducted to the chamber 23 beneath the baffle 49 through a third set of tubes which obviously c the lowermost tubes of the boiler, and inasmuch as the opening 31 in the end plate 25 communicates with the chamber 23 beneath the baffle 49, the heating medium from the boiler. c

When the boiler. is used as a steam generator it is equipped with a steam dome 53 mounted on the upperporticn of theouter shell by a tubular support 54 which'alse communicates the interior of the shell with the interior of the steam dome. This dome' jas is customary is provided with a pop-off safety valve-55 and a steam outlet pipe 56 through which the steamis drawn off for consumption; H

A condensate return is'alsc provided,'and includes a compartment or chamber 57 which may is then exhausted be-mounted from the top of the shell 55 by a suitable support 58 to form substantially a continuation of the dome 53; Into this chamber 57, the condensate returning through a line 59 is conducted through a three-wayvalve 60 and a'short sectionof pipe 61 connecting the valve with the interior of the chamber With the valve in its normal position communication is afforded between the return line 59 and the interior of the chamber so that condensate accumulates within the chamber 57, an 'air re lease valve 62 being provided to vent the air from chamber, the air release valve 62 is closed and the three-way valve moved to a position at which communication between the return line 59, and the pipe 61 is shut off and communication established between a pipe 64 tapped into the steam line 56, and the pi'pe 61. The-steam pressure is to which an invention of this character apper-' tains, that this invention affords a very simple and compact construction for multiple pass boilers and that the provision of the chambers 23 and 24 at the opposite ends of the boiler by positioning the header plates inwardly of the ends of the boiler affords simple means for communicating the different sets of tubes.

It is further observed that these chambers are so formed that all portions thereof subjected to intense temperatures contact directly with the water in the boiler, and that the interior of the chambers 23 and 24 is readily accessible by merely removing the end plates, and that by making the bafiles removable necessary replacements may be easily effected.

It is also apparent that this invention affords simple and positive means for returning condensate to the boiler.

What I claim as my invention is:

1. In a boiler comprising a cylindrical shell, short cylinder sections telescoped within the cylindrical shell at its outer ends, relatively heavy metal rings secured between the extremities of the cylindrical shell and the outer extremities of the cylinder sections, header plates fixed to the inner ends of the cylinder sections, end walls fixed to said heavy metal rings and closing the spaces defined by the cylinder sections and header plates to form spaced chambers, a plurality of sets of tubes communicating the chambers, a heating medium inlet extending through one wall and both header plates to communicate with one chamber, and baffles-within the chambers for deflecting a heating medium injected into the inlet back and forth through the different sets of tubes.

2. A boiler comprising a cylindrical shell, a substantially cup-shaped element having side walls and a bottom wall telescoped within each end of the shell with its open side outward, a ring secured between the extremities of the shell and the outer extremity of the side wall of each cup-shaped element to close the spaces between the side walls of the cup-shaped elements and the adjacent end portions of the cylindrical shell, end walls fixed to the rings and closing the open sides of the cup-shaped elements to form spaced chambers, a plurality of sets of tubes communi cating the spaced chambers, a combustion chamber extending through one end wall and the bottom walls of both cup-shaped elements to communicate with the chamber opposite said one end wall, and bafiles within the chambers for deflecting the heating medium injected into the combustion chamber back and forth from one of said spaced chambers to the other through the different sets of tubes toproduce a down draft, and means at the lower portion of said end wall for exhausting the heating medium at the completion of its passage back and forth through th different sets of tubes. Y

3. A boiler comprising a cylindrical shell, a ring secured in each outer end of the shell, a cup shaped element at each end of the shell having its cylindrical side wall fixed to the inner periph- 3 cry of the adjacent ring, whereby the rings space the side walls of the cup shaped elements from the shell, end walls fixed to the rings at the ends of the shell and closing the cup shaped elements to formspaced chambers, a plurality of tubes having their ends connected with the bottom walls of the cup shaped elements to communicate the chambers, a combustion chamber communicated with one of said spaced chambers and extending through the other chamber with its open end providing a heating medium inlet,

bafiles within the spaced chambers for deflecting a heating medium injected into the combustion chamber through difierent sets of tubes from one chamber to the other to produce a down draft,

and means at the lower portion of one end wall for exhausting the heating medium at the completion of its passage back and forth through the diiferent sets of tubes.

4. A boiler comprising a cylindrical shell, a ring of substantial cross section secured in each outer end of the shell, a short cylinder section within each end portion of the shell and having its outer end fixed to the inner periphery of the ring, a header plate fixed to the inner end of each cylinder section, a combustion chamber extending throughout substantially the length of the shell and through aligned openings in the header plates, means securing one end of the combustion chamber to the header plate portion encircling its opening, the opening in the other header plate being larger than the combustion chamber, a cylinder telescoped over the combustion chamber and fixed to the header plate portion surrounding said larger opening with its outer end terminating substantially in the plane of the adjacent end of the shell, means for securing said outer end of the cylinder to the adjacent portion of the combustion chamber to maintain the cylinder spaced from the combustion chamber, end walls fixed to the rings at the ends of the shell and closing the open ends of the cylinder sections to form spaced chambers, the end wall adjacent the cylinder connected with the combustion chamber having an opening to accommodate the combustion chamber and a second opening providing an outlet from the adjacent chamber, a plurality of tubes communicating the chambers, and bafiles within the chambers for deflecting a heating medium injected into the combustion chamber back and forth through different sets of tubes from one chamber to the other to be finally exhausted from the second opening in said one end wall.

5. In a multiple pass boiler of the character described, including a chamber at each end of the boiler and tubes communicating thechambers, readily removable bafiies within the chambers for deflecting a heating medium back and forth through different sets of tubes and from one chamber to the other, each of said baflies comprising a metal bridge piece substantially T,

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