Improvements in and relating to Fire Tube or Water Tube Boilers.
Year: 1892

page_text: Date of Application, 8th Aug., 1892-Accepted, 10th Sept., 1892
COMPLETE SPECIFICATION.
Improvements in and relating to Fire Tube or Water Tube Boilers.
1, RUDOLF MÜLLER, of Reiherstieg near Hamburg in the Empire of Germany,
Engineer do hereby declare the nature of this invention and in what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement :-
This invention relates to fire tube boilers and also to water tube boilers, where
in the former the fire gases pass through a number of tubes surrounded by water
and in the latter case pass about the outside of tubes containing the water and
carried by end plates. The improvements relate principally to the plates which
carry the ends of the tubes and consist in making these plates with a number of
surfaces arranged step fashion one with regard to the other so that all the tubes
may be fixed in portions of plate square to the ends of the tubes while the
plate as a whole may be given the general average curvature that may be desired.
according to the shape of the boiler.
The invention also consists in providing or making the bottom plate of such fire
tube boiler or the roof plate of the fire box, as or with a series of vaulted steps or
step like corrugations for the purpose of strengthening the bottom plate or fire box
roof against pressure from the boiler or outwards against the fire box.
A boiler constructed according to this invention and intended for a fire tube
boiler is shown in the annexed drawing in which Fig. 1 is a vertical section in
the central plane parallel with the tubes. Fig. 2 is a half front elevation half
cross section on line y y¹ Fig. 1. Fig. 3 is a horizontal section on line a¹
Fig. 1.
rrare the tubes and M M' the bowed or curved end plates in which the tubes
are secured. As shown in the drawing the plates M M' while possessing an average
curvature on plan, are made up of a number of step like surfaces e e e e and e' e' e¹ e¹
respectively which form flat surfaces for the reception of the ends of the tubes.
The advantages of this form of plate are that the tubes may be more securely
and tightly fixed in the plate and the latter is also strengthened by the bent form
which gives a stiffer plate.
The bottom plate of this boiler, which plate would equally form the vaulted
cover plate of the fire box of a water tube boiler, is also made as at B in the
drawing that is to say vaulted or curved but with also a series of step like bends ss
as shown in Figs. 1 and 2.
Having now particularly described and ascertained the nature of this said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
1). In tubular boilers in which the tubes are secured in end plates the construc-
tion of these end plates in a step like manner as M M' whereby flat surfaces are
obtained for the reception of the tubes while the general form of the plate is
curved or other than perpendicular to the tubes.
2). In tubular boilers, a bottom plate, or fire box cover plate of an arched but
step like form B substantially as and for the purpose described.
Dated this 8th day of Anonst 1805
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.