PIPE IN A FIRE TUBE BOILER

TUYAU D'UNE CHAUDIERE A TUBE DE FUMEE

English Abstract

A pipe in a fire tube boiler, designed to convey the combustion gases
and to be struck at its outer surface by the water to be heated, comprising a
wall which has a constant thickness along its entire length and a plurality of
fins which protrude monolithically from at least one arc-like support, which
is associated in contact with the internal surface of the wall.

Claims

3
THE EMBODIMENTS OF THE INVENTION IN WHICH AN
EXCLUSIVE PROPERTY OR PRIVILEGES IS CLAIMED ARE
DEFINED AS FOLLOWS
1. A pipe in a fire tube boiler, designed to convey the combustion
gases and to be struck at its outer surface by the water to be heated,
comprising a wall which has a constant thickness along its entire length and
a plurality of fins which protrude monolithically from at least one arc-like
support, which is associated in contact with the internal surface of said
wall.
2. The pipe according to claim 1, wherein the fins protrude
monolithically from two arc-like sectors associated in contact with the
internal surface of said wall.
3. The pipe according to claim 1, wherein the fins protrude from three
arc-like sectors associated in contact with the internal surface of said wall.
4. The pipe according to claim 1, wherein the fins protrude from four
arc-like sectors associated in contact with the internal surface of said wall.

Description

CA 02545929 2006-05-05
PIPE IN A FIRE TUBE BOILER
i
The present invention relates to a pipe in a fire tube boiler.
It is known that boilers for generating hot water, particularly small
boilers for domestic use, quite frequently have a structure that is known as
"fire tube", comprising a plurality of pipes designed to convey internally the
products of the combustion generated by a burner before sending them to
the flue, and to be struck on the outside by the water to be heated.
The aim of the present invention is to provide a pipe which is adapted
to be installed in a fire tube boiler and has high characteristics of heat
exchange between the products of combustion and the water to be heated.
The above aim and other objects that will become better apparent
hereinafter are achieved by a pipe in a fire tube boiler according to the
invention, designed to convey the combustion gases and to be struck at its
outer surface by the water to be heated, characterized in that it comprises a
wall having a constant thickness along its entire length and a plurality of
fins which protrude monolithically from at least one arc-like support, which
is associated in contact with the internal surface of said wall.
Further characteristics and advantages of the invention will become
better apparent from the description of some preferred but not exclusive
embodiments of the pipe according to the invention, illustrated by way of
non-limiting example in the accompanying drawings, wherein:
Figure 1 is a transverse sectional view of the pipe according to the
invention, taken along the line I-I of Figure 2;
Figure 2 is a sectional view of a portion of the pipe, taken along the
line 11-II of Figure 1;
Figures 3 and 4 are transverse sectional views of pipes according to
further embodiments.

CA 02545929 2006-05-05
2
With reference to the Figures 1 and 2, the reference numeral 1
generally designates the pipe according to the invention, which is designed
to convey internally the products of combustion and to be struck at its outer
surface by the water to be heated.
The pipe 1 comprises a wall 2, which has a constant thickness along
its entire length, and at least one and preferably two arc-like sectors 3 and
4
are associated in contact with said wall, for example by means of a mold or
by rolling, and a plurality of fins such as 3a, 4a protrude from the sectors.
Such pipe 1 ensures good heat exchange efficiency and therefore
ensures a temperature of the fins that is high enough to prevent
condensation of the water vapor that is present in the combustion gases
conveyed by the pipe.
Figures 3 and 4 illustrate further embodiments related to the shape of
the fins provided in the pipe: thus, pipe 5 of Figure 3 comprises a wall 6
having a constant thickness along its entire length, which has in contact
therewith three arc-like sectors 7, 8, 9, from which fins such as 7a, 8a, 9a
protrude respectively; pipe 10 of Figure 4 comprises a wall 11 with constant
thickness, which has in contact therewith four arc-like sectors 12, 13, 14,
15, from which fins such as 12a, 13a, 14a, 15a protrude.
The described invention is susceptible of numerous other
modifications and variations, all of which are within the scope of the
appended claims; all the details may further be replaced with other
technically equivalent elements.

Representative Drawing