US2400174A - Boiler - Google Patents

Description

y 1946. e. 'N. STRIKE 2,400,174

BOILER Filed Sept. 18, 1944 I 2 Sheets-Sheet 2 Arrow/Ev Patented May 14, 1946 UNITED STATES PATENT OFFICE BOILER George N. Strike, Los Angeles, Calif.

Application September 18, 1944, Serial No. 554,598

4 Claims.

This invention relatesto boilers and more especially to a small boiler of the type for producing steam for small laundries.

An object of the invention is to provide a simple, practical and efficient boiler of the character described.

Another object of the invention is to provide an improved boiler of relatively small dimensions, particularly adapted for producing steam for use in laundries and the like.

A further object of the invention is to provide, in a boiler of the character described, a novel means of construction particularly adapted for replacement of damaged or worn parts.

An additional object is to provide in a boiler of the character described a tube type heating element wherein damaged or worntubes may be individually removed and replaced without interference with other tubes.

A further object is to provide in a boiler of the character described a novel type of tubular heating element and means for removal and replacement thereof without interference with other tubular heating elements.

Still other objects of my invention include providing such means that are positive in operation, convenient in use, economical of manufacture, relatively simple, and of general superiority and serviceability,

The invention also comprises novel details, of construction and novel combinations and arrangements of parts, which will more fully appear in the course of the following description, However, the drawings merely show and the following description merely describes embodiments of the present invention, which is given by way of illustration'or example only,

In the drawings, like reference characters designate similar parts in the several views.

Fig. l is an elevation view, partly in section, showing an embodiment of my invention, the section being taken substantially along the line 1-! of Fig. 2.

Fig. 2 is a sectional elevation of the same, the section being taken along the line 2-2 of Fig. 1.

Fig. 3 is an enlarged view in central section showing one of the tubes and means of attachment of the same to the header.

Fig. 4 is an elevation view in central section of a modified form of my invention.

i Fig. 5 is an enlarged view in central section of a modified form of tubular heating element.

Fig. 6 is an end view of the tube shown in Fig. 5.

Referring more particularly to the drawings I show a boiler comprising a suitable housing ill of heat insulating material, the embodiment shown being substantially rectangular and having a bottom I'l mounted on legs l2 and having a top wall I3 suitably provided with an opening in communication with a smoke pipe or stack It. The housing iil provides a combustion chamber and has a suitable door It in a wall thereof, the door being provided with hinges l1 and latching means |B A burner l9, such as a gas burner, is provided in combustion chamber l5 and may be suitably connected to a fuel inlet pipe having a valve 2|,

I show a water and steam header 22 positioned within housing Ill and which extends vertically along a wall opposite door 16, the header having an inner Wall 23 provided with a plurality of flanges 24 having threaded openings 25 therein. Flanges 24 are arranged in horizontal rows, the flanges of each row being staggered with respect to the flanges of the adjacent rows, and a heating tube or pipe 26 provided with a threaded open end 21 is secured by threaded portion 25 thereof within each flange 24 and extends horizontally across the combustion chamber l5 and has a closed end 28 adjacent door l6. End 28 may be formed by welding a disc or plug to pipe 26, or the pipe may be formed with an integral closed end. Header 22 is provided near the bottom with a water inlet pipe 29 which extends through an openingin housing [0 and provided with a shutoffvalve 30. A steam outlet pipe 3| is similarly secured at the top of header 22 and provided with a valve 32.

The operation of the invention should be obvious from the foregoing description, Water supplied to header or water leg 22 through pipe 29 fills the same to a desired water level, as shown, above the top row of heating tubes 26 and the tubes become filled with water being in communication with the header through flanges 24. Heat is supplied to combustion chamber i5 from burner l9 and the hot gases rise therein past and between the tubes 26 in an eflicient manner for transferring the heat to the tubes 26 and the contained water, thus forming steam in header 22 above the water level which may be conducted away for use through pipe 3|. The pipes 26 are shown to be so secured in flanges 24 as to be individually removed by unscrewing therefrom and being replaced with new tubes whenever any of the tubes become damaged from use, such as by corrosion or cracking, and replaced by other tubes without interference from or with any of the adjacent tubes. Furthermore, the tube structure is such that when door I6 is opened, ready access to the tubes is provided for cleaning or replacing. there being no caps, plugs or flanges at the outer ends of the tubes adjacent door [6.

In Figures 4 to 6 I show a modified form of my invention wherein is shown a boiler 40, preferably, though not necessarily rectangular in form, having side walls 41 and end walls 42 provided with doors 43 hinged at 44 and provided with latching means 45, the walls forming a combustion chamber 45. A water and steam header 4'! is positioned in combustion chamber 45 and extends transversely between walls H and has a water inlet 48 and a steam outlet as.

Header 41 is preferably rectangular in form and has oppositely disposed walls 50 to which the heating elements are secured. Walls 50 are provided with a plurality of threaded openings 5i in each of which is threadedly secured a bushing 52 which may extend inwardly and be pro vided with a supplemental securing means, such as welds 54. A threaded nipple 55 is secured to each bushing 52 and may be run on the threaded portion thereof to engage walls 50 to provide a very tight connection with the bushing. A tubular heating element 55 is threaded at 5'! into each nipple 55, and the other end of each element 56 is positioned immediately within one of the doors 43. Tubular members 56 have open outer ends provided with interior threads 58 in which a threaded plug 59 may be secured, the plugs being each provided with a longitudinal boss 69 or an equivalent formation by which a tool, such as a 1 wrench, may be applied for tightening er loosening the plugs as occasion may require.

As shown, tubular elements 56 are arranged in rows on each side of header 4?, and a burner Si is shown positioned under each group of heating elements 56 within combustion chamber 46, the exhaust gases from which may be discharged through a stack 62. I also provide one or more safety plugs 63 in header 4? which plugs will give way should an excessive pressure develop in the header.

From the description of the invention, as set forth in Figures 4 to 6, it will be clear that tubular elements 56 may be individually removable from bushings 55 and header 4'! through doors 43. It should also be clear that should the threaded connection between heating elements 56 and nipples 55 become damaged after a number of replacements, or otherwise, nipples 55 may be individually removed from bushings 52, and replacement nipples substituted. It should also be obvious that plugs 59 may be individually removed, and scale removed from the interior of tubular elements 55, thus extending the life of the tubes and postponing the eventual time of replacement thereof.

While I have illustrated and described what I now regard as the preferred embodiments of my invention, the construction is, of course, subject ito modifications without departing from the spirit and. scope of my invention. I, therefore, do not wish to restrict myself to the particular forms of construction illustrated and described, but desire to avail myself of all modifications that may fall within the scope of the appended claims.

Having thus described my invention what I claim and desire to secure by Letters Patent is:

1. A boiler comprising a combustion chamber having a door, a header in said combustion chamber providing a water leg, an inlet to and an outlet from said leg, said header having a plurality of externally threaded nipples extending within said combustion chamber, couplings threadedly engaging said nipples, and a series of pipes threading in said couplings and having their free ends extending toward said door, said pipes having plugs within the free ends thereof to close same, and said plugs provided with extensions projecting beyond the ends of said pipes.

2. A boiler comprising a housing having a combustion chamber, a header therein in spaced relation to a plurality of wall portions of said chamber and forming a water leg having an inlet and an outlet, said header having a plurality of openings in a wall thereof and threaded sockets about said openings and extending within said combustion chamber, a plurality of pipes extending from said header toward one of said wall portions, said pipes having threaded ends for detachable connection with said sockets, said pipes having removable plugs within the free ends thereof provided with extensions for a wrench.

3. A boiler comprising a housing having a combustion chamber, a door in a wall of the housing, a header therein in spaced relation to a plurality of wall portions and forming a water leg, said header having openings in a wall thereof and externally threaded sockets in said openings, a burner in said chamber, a plurality of pipes extending from said header toward said door, said pipes each having means for detachable connection to said header, said means including a coupling secured to said sockets, and removable plugs in the free ends of said pipes.

4. A boiler comprising a housing having a combustion chamber, a door in a wall of the housing, a header therein in spaced relation to a plurality of wall portions of said chamber and forming a water leg, a plurality of pipes extending from said header toward said door, the free ends of said pipes having removable plugs, said pipes each having means for detachable connection to said header, said means including a bushing secured to said header and a coupling secured to said bushing.

GEORGE N. STRIKE.

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