[0001] The invention concerns a gas burner unit intended for a heat exchanger.
[0002] In the known solutions, the heat exchanger gas burner unit incorporates a perforated
burner wall and an air and fuel duct used to supply the air and fuel mix to the perforated
burner wall. The operating burner unit generates substantial noise which can be a
nuisance to the surrounding environment.
[0003] Known from patent document
JPH 0264306 A is a heat exchanger in which the inner space of the chamber for the air and fuel
mix supplied to the burner is divided with a flat baffle spreading along the chamber
and featuring small holes. The baffle is intended to e.g. suppress the noise accompanying
the work of a burner.
[0004] The purpose of the invention is to develop such burner unit structure which will
allow to steady the flow of the fuel mix so as to achieve even flame on the burner
surface, which in effect will reduce the noise generated by working exchanger.
[0005] A gas burner unit intended for a heat exchanger, having a perforated burner wall
and an air and fuel duct according to the invention is characterised in that in the
air and fuel duct, over the perforated burner wall, there is a transverse baffle featuring
holes and dividing the air and fuel duct into two segments: before and after the said
baffle, where the baffle is shaped so that the cross section of the segment of the
air and fuel duct located between the baffle and the perforated burner wall increases
along the baffle towards the perforated burner wall, and the cross section of the
segment of the air and fuel duct located within the inner space delimited by the baffle
decreases towards the perforated burner wall, and where fixed to the wall of the air
and fuel duct above the baffle is a deflector for the air and fuel mix, shaped so
that its cross section decreases towards the perforated burner wall.
Preferably, the baffle is given the shape of the side wall of a cone or truncated
cone with its smaller base also featuring holes, or the shape of an open dome, or
of the side wall of a truncated pyramid, its smaller base also featuring holes, where
the shape of the baffle depends on the shape of the burner. Preferably, the baffle
is fitted with a mounting flange.
Preferably, the total area of the holes in the baffle accounts for 0.3 to 1.2 of the
area of the opening of the fan used to supply the air and fuel mix to the air and
fuel duct.
Preferably, the angle of inclination of the side surface of the air and fuel mix deflector
with respect to the perforated burner wall corresponds to the angle of inclination
of the side surface of the baffle with respect to the perforated burner wall.
Preferably, the air and fuel mix deflector is given the conical shape.
[0006] Further benefits and advantages of the present invention will become apparent after
a careful reading of the detailed description with appropriate reference to the accompanying
drawings.
In the drawings:
Fig. 1 shows the cross section of the burner unit with visible baffle in the shape
of the side wall of a cone featuring holes and fitted with an air and fuel mix deflector
in the shape of the side wall of a cone, in axonometric view;
Fig. 2 depicts the baffle in the shape of the side wall of a cone with round holes
and a mounting flange, in axonometric view;
Fig. 3 shows the baffle as in Fig. 2, in side view;
Fig. 4 depicts the baffle as in Fig. 2, in bird's eye view;
Fig. 5 shows the baffle in the shape of the side wall of a truncated cone with round
holes, fitted with a smaller base also featuring holes, and fitted with a mounting
flange on the side of the larger base, in axonometric view;
Fig. 6 presents the baffle as in Fig. 5, in side view;
Fig. 7 depicts the baffle as in Fig. 5, in bird's eye view;
Fig. 8 shows the baffle in the shape of an open dome with square holes, in axonometric
view;
Fig. 9 depicts the baffle as in Fig. 8, in side view;
Fig. 10 presents the baffle as in Fig. 8, in bird's eye view;
Fig. 11 depicts the baffle in the shape of the side wall of a pyramid with round holes,
fitted with a smaller base also featuring holes, in axonometric view;
Fig. 12 presents the baffle as in Fig. 11, in side view;
Fig. 13 -shows the baffle as in Fig. 11, in bird's eye view;
Fig. 14 shows the baffle in the shape of the side wall of a truncated pyramid with
round holes, fitted with a smaller base also featuring holes, in axonometric view;
Fig. 15 depicts the baffle as in Fig. 14, in side view;
Fig. 16 presents the baffle as in Fig. 14, in bird's eye view;
Fig. 17 shows the air and fuel mix deflector in the conical shape, in axonometric
view;
Fig. 18 depicts the deflector as in Fig. 17, in side view;
Fig. 19 shows the deflector as in Fig. 17, in bird's eye view.
[0007] In the first exemplary embodiment of the invention (Fig. 1 to Fig. 4), a gas burner
unit intended for a heat exchanger incorporates a perforated wall 1 of the burner,
air and fuel duct 2, where there is a transverse baffle 3 over the perforated wall
1 of the burner, and further includes a plate 6 of the burner. Fixed to the plate
6 of the burner is the baffle 3, air and fuel duct 2, and perforated wall 1 of the
burner. The baffle 3 is given the shape of the side wall of a cone hollow inside (Fig.
2 to Fig. 4), where the apex of the cone points in the direction of the perforated
wall 1 of the burner and divides the air and fuel duct 2 into two segments: the segment
under the baffle 3 and the one over the baffle 3. The cross section of the segment
of the air and fuel duct 2 located within the inner space delimited by the baffle
3 decreases towards the perforated wall 1 of the burner.
The baffle 3 features round holes 4 through which the air and fuel mix is supplied
to the perforated wall 1 of the burner, as well as a mounting flange 5 used to screw
the baffle 3 to the plate 6 of the burner. Fixed to the wall of the air and fuel duct
over the baffle 3 is the air and fuel mix deflector 7 given the conical shape (Fig.
1 plus Fig. 17 to Fig. 19), with its apex pointing towards the perforated wall 1 of
the burner. The angle of inclination of the side surface of the air and fuel mix deflector
7 with respect to the perforated burner wall 1 corresponds to the angle of inclination
of the side surface of the baffle 3 with respect to the perforated burner wall 1.
[0008] In the second exemplary embodiment of the invention, the burner unit described in
the first example incorporates the baffle 3 in the shape of the side wall of a truncated
cone hollow inside (Fig. 5 to Fig. 7), fitted with a smaller base pointing towards
the perforated burner wall 1, which divides the air and fuel duct 2 into two segments:
the segment under the baffle 3 and the one over the baffle 3. The cross section of
the segment of the air and fuel duct 2 located within the inner space delimited by
the baffle 3 decreases towards the perforated burner wall 1. The baffle 3 features
round holes 4 made in its side surface and the base, and is fitted with a mounting
flange 5 used to screw the baffle 3 to the burner plate 6.
In the same embodiment of the invention, the air and fuel mix deflector 7 is also
conical in shape (Fig. 17 to Fig. 19), with its apex pointing towards the perforated
burner wall 1. The angle of inclination of the side surface of the air and fuel mix
deflector 7 with respect to the perforated burner wall 1 corresponds to the angle
of inclination of the side surface of the baffle 3 with respect to the perforated
burner wall 1.
[0009] In the third exemplary embodiment the burner unit described in example 1 incorporates
the baffle 3 in the shape of an open dome (Fig. 8 to Fig. 10), oriented in the direction
opposite to the perforated wall 1 of the burner, where the baffle divides the air
and fuel duct 2 into two segments: the segment under the baffle 3 and the one over
the baffle 3. The cross section of the segment of the air and fuel duct 2 located
within the inner space delimited by the baffle 3 decreases towards the perforated
wall 1 of the burner. The baffle 3 features square holes 4, and is fitted with a mounting
flange 5 used to screw the baffle 3 to the burner plate 6.
In this embodiment the air and fuel mix deflector 7 is also conical in shape (Fig.
17 to Fig. 19), with the apex pointing towards the perforated burner wall 1.
[0010] In the fourth exemplary embodiment the burner unit described in example one incorporates
the baffle 3 in the shape of the side wall of a pyramid hollow inside (Fig. 11 to
Fig. 13), with its apex pointing towards the perforated burner wall 1, where the baffle
divides the air and fuel duct 2 into two segments: the segment under the baffle 3
and the one over the baffle 3. The cross section of the segment of the air and fuel
duct 2 located within the inner space delimited by the baffle 3 decreases towards
the perforated wall 1 of the burner. The baffle 3 features round holes 4. The baffle
3 is welded to the burner plate 6.
In this embodiment of the invention the air and fuel mix deflector 7 is also conical
in shape (Fig. 17 to Fig. 19), with the apex pointing towards the perforated burned
wall 1. The angle of inclination of the side surface of the air and fuel mix deflector
7 with respect to the perforated burner wall 1 corresponds to the angle of inclination
of the side surface of the baffle 3 with respect to the perforated burner wall 1.
[0011] In the fifth embodiment of the invention the burner unit described in the first example
features the baffle 3 in the shape of the side wall of a truncated pyramid (Fig. 14
to Fig. 16) with the smaller base oriented towards the perforated burner wall 1, where
the baffle divides the air and fuel duct 2 into two segments: the segment under the
baffle 3, and the one over the baffle 3. The cross section of the segment of the air
and fuel duct 2 located within the inner space delimited by the baffle 3 decreases
towards the perforated burner wall 1. The baffle 3 features round holes 4, made in
its side wall and the base. The baffle 3 is welded to the burner plate 6.
In this embodiment of the invention the air and fuel mix deflector 7 is also conical
in shape (Fig. 17 to Fig. 19), with the apex pointing towards the perforated burner
wall 1. The angle of inclination of the side surface of the air and fuel mix deflector
7 with respect to the perforated burner wall 1 corresponds to the angle of inclination
of the side surface of the baffle 3 with respect to the perforated burner wall 1.
[0012] The shape of the baffle 3 depends on the shape of the burner.
[0013] In all embodiments of the invention the total area of the holes 4 in the baffle 3
accounts for 0.3 to 1.2 of the area of the opening of the fan used to supply the air
and fuel mix to the air and fuel duct 2.
[0014] The air and fuel mix is supplied via the air and fuel duct 3 fitted with a deflector
7 to the perforated wall 1 of the burner through the holes 4 in the baffle 3. The
shape of the baffle 3 and the deflector 7 and their positioning towards each other
in the air and fuel duct 2 according to the invention ensures substantial reduction
of noise accompanying the work of the burner unit. Before the air and fuel mix gets
inside the baffle 3, it comes across the deflector 7 and when it flows around it,
it gets evenly directed to the baffle 3, from where, through the holes 4, it evenly
gets to the perforated burner wall, thus ensuring steady burning of the mix, which
reduces the noise generated by the working burner.
1. A gas burner unit intended for a heat exchanger, having a perforated burner wall and
an air and fuel duct is characterised in that in the air and fuel duct (2), over the perforated burner wall (1), there is a transverse
baffle (3) featuring holes (4) and dividing the air and fuel duct (2) into two segments,
before and after the said baffle, where the baffle is shaped so that the cross section
of the segment of the air and fuel duct (2) located between the baffle (3) and perforated
burner wall (1) increases along the baffle (3) towards the perforated burner wall
(1), and the cross section of the segment of the air and fuel duct (2) located within
the inner space delimited by the baffle (3) decreases towards the perforated burner
wall (1), and where fixed to the wall of the air and fuel duct (2) above the baffle
(3) is a deflector (7) for the air and fuel mix, shaped so that its cross section
decreases towards the perforated burner wall (1).
2. The unit according to Claim 1, characterised in that the baffle (3) is given the shape of the side wall of a cone.
3. The unit according to Claim 1, characterised in that the baffle (3) is given the shape of the side wall of a truncated cone with the smaller
base.
4. The unit according to Claim 1, characterised in that the baffle (3) is given the shape of an open dome.
5. The unit according to Claim 1, characterised in that the baffle (3) is given the shape of the side wall of a pyramid.
6. The unit according to Claim 1, characterised in that the baffle (3) is given the shape of the side wall of a truncated pyramid with the
smaller base.
7. The unit according to Claims 1 to 6, characterised in that the baffle (3) is fitted with a mounting flange (5).
8. The unit according to Claims 1 to 6, characterised in that the total area of the holes (4) in the baffle (3) accounts for 0.3 to 1.2 of the
area of the opening of the fan used to supply the air and fuel mix to the air and
fuel duct (2).
9. The unit according to Claims 1 to 8, characterised in that the angle of inclination of the side surface of the air and fuel mix deflector (7)
with respect to the perforated burner wall (1) corresponds to the angle of inclination
of the side surface of the baffle (3) with respect to the perforated burner wall (1).
10. The unit according to Claims 1 or 9, characterised in that the air and fuel mix deflector (7) is conical in shape.