Note: Descriptions are shown in the official language in which they were submitted.
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DESCRIPTION
Invention Title
FLAME HOLE UNIT STRUCTURE OF A GAS BURNER
Technical Field
The present invention relates to a flame hole unit structure of a gas burner,
and
more particularly, to a flame hole unit structure of a gas burner in which a
structure of a
burner flame hole unit can be simplified and the unit can be easily assembled
and
manufactured by overlapping cut portions of a plurality of partially-cut
plates to cross
each other to form a mixed gas (gas and air) flow path and a flame hole
through a gap
between the cut portions.
Background Art
In general, a gas burner used in a combustion device such as a boiler or a
water
heater may be classified as a Bunsen burner or a pre-mixed burner according to
a method
of mixing a combustion gas with air.
The Bunsen burner is a burner that supplies a minimum of primary air required
for combustion in a nozzle unit through which a gas is injected, and supplies
excessive
secondary air to a portion at which a flame is formed, realizing perfect
combustion, and
has an advantage of good combustion stability. However, since the flame is
formed by
the secondary air, a flame length may be increased.
The pre-mixed burner combusts a pre-mixed gas in which a combustion gas and
air are pre-mixed in a mixing chamber. Since the entire flame length can be
reduced
and a flame temperature can be lowered to reduce a load with respect to the
same area,
generation of pollutants such as carbon monoxide, nitrogen oxide, and so on,
can be
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reduced to a minimum value.
While the Bunsen burner is mainly used in the conventional art, in recent
times, a
pre-mixed burner has mainly been used to reduce generation of pollutants and
miniaturize a combustion chamber.
FIG. 1 is a perspective view showing an example of a conventional flame hole
unit structure of a gas burner.
A conventional pre-mixed type gas burner 1 has a structure in which air
supplied
from a blower 30 and a combustion gas supplied through a gas supply pipe 40
are pre-
mixed in a manifold 50 installed at a front surface of a burner body 20 to be
supplied to a
burner flame hole unit 10 installed over the burner body 20.
While the conventional burner flame hole unit 10 has a structure in which
flame
holes are punched in one plate having a flat or cylindrical shape, such a
structure may
cause imperfect combustion and backfire when a combustion surface of the
burner is
deformed or, in a severe case, damage to the flame holes occurs due to thermal
stress.
In order to compensate for these disadvantages, a burner flame hole unit
structure
formed of a material such as a metal fiber mat woven of a metal fiber, a
ceramic plate
manufactured by sintering ceramic, or the like, has been used.
However, according to the flame hole unit structure formed of the metal fiber
mat
or the ceramic plate, a material cost is increased and a manufacturing method
is
complicated, which increases a manufacturing cost, and a structure of a pre-
mixer is
complicated, which increase a pressure loss so that a flame becomes unstable
and noises
occur.
In addition, when the metal fiber mat manufactured through weaving is used as
a
material for the flame hole unit, since an operator pulls and assembles the
metal fiber
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mat upon assembly of the burner, irregular sizes of the flame holes in a local
area or the
entire area of the metal fiber mat may cause imperfect combustion and
backfire, and
flexibility in material characteristics of the metal fiber mat may cause
sagging after
installation, irregularly deforming the combustion surface and the flame
holes.
Further, in the case in which the ceramic plate manufactured through the
sintering
method is used as a material for the flame hole unit, when condensation water
generated
from a heat exchanger upon upward combustion is dropped on the combustion
surface, a
surface of the flame hole unit may be damaged due to water to generate the
flame holes
having irregular shapes, increasing probability of generation of imperfect
combustion.
I0
Disclosure
Technical Problem
In order to solve the foregoing and/or other problems, it is an aspect of the
present
invention to provide a flame hole unit structure of a gas burner in which a
structure of a
burner flame hole unit can be simplified and the structure can be easily
manufactured.
Technical Solution
The foregoing and/or other aspects of the present invention may be achieved by
providing a flame hole unit structure of a gas burner having a plurality of
flame holes
through which a mixed gas of a gas and air is injected to form a flame,
characterized in
that a plurality of partially cut plates overlap, the cutout portions of the
adjacent plates
overlap across each other, and a mixed gas (the gas and air) flow path and the
flame
holes are formed through gaps of the cutout portions.
Here, the plurality of plates may include a plurality of overlapping sets of
plates,
each set including an inner plate having a partially cut upper or lower groove
and outer
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plates overlapping at both sides of the inner plate and having partially cut
upper and
lower grooves corresponding to the groove formed in the inner plate to cross
each other.
In addition, fixing plates may additionally overlap at both sides of the set
of
plates so that the plurality of flame holes are disposed at predetermined
intervals.
Further, the flame hole may have a flat rectangular cross-sectional shape.
Advantageous Effects
According to the flame hole unit structure of the gas burner of the present
invention, a plurality of partially-cut plates overlap to form the burner
flame hole unit so
that a structure of the burner flame hole unit can be simplified and the
structure can be
easily manufactured, and thus, time and cost consumed for manufacture of the
gas burner
can be reduced.
In addition, according to the present invention, as the moving path of the
mixed
gas and the structure in communication with the flame holes are formed in the
gap
between the overlapping plates, a deformation level of the flame holes due to
thermal
stress can be reduced to increase stability of the flame and prevent imperfect
combustion.
Description of Drawings
The above and other aspects and advantages of the present invention will
become
apparent and more readily appreciated from the following description of
exemplary
embodiments, taken in conjunction with the accompanying drawings of which:
FIG. I is a perspective view showing an example of a conventional flame hole
unit structure of a gas burner;
FIG. 2 is a perspective view of a flame hole unit structure of a gas burner in
accordance with an exemplary embodiment of the present invention;
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FIG. 3 is a partially exploded perspective view of FIG. 2;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 2;
FIG 6 is a cross-sectional view taken along line C-C of FIG. 2;
FIG. 7 is a cross-sectional view taken along line D-D of FIG. 2; and
FIG. 8 is a cross-sectional view taken along line E-E of FIG. 2.
<Description of Major Reference Numerals>
1: Gas burner 10, 100: Burner flame hole unit
111 a, 121 a, 122a: Groove 20: Burner body
30: Blower 40: Manifold
110, 111, 112, 113: Inner plate
120, 121, 122, 123, 124, 125, 126: Outer plate
130, 131, 132, 133, 134: Fixing plate
140, 141, 142, 143, 144, 145, 146: Mixed gas inlet port
150, 151, 152, 153: Inner space
160, 161, 162, 163: Flame hole
Mode for Invention
Reference will now be made in detail to the embodiments of the present
invention,
examples of which are illustrated in the accompanying drawings. However, it
will be
apparent to those skilled in the art that the following embodiments can be
readily
understood and modified into various types, and the scope of the present
invention is not
limited to the embodiments.
FIG. 2 is a perspective view of a flame hole unit structure of a gas burner in
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accordance with an exemplary embodiment of the present invention, FIG. 3 is a
partially
exploded perspective view of FIG. 2, FIG. 4 is a cross-sectional view taken
along line A-
A of FIG. 2, FIG. 5 is a cross-sectional view taken along line B-B of FIG. 2,
FIG. 6 is a
cross-sectional view taken along line C-C of FIG. 2, FIG. 7 is a cross-
sectional view
taken along line D-D of FIG. 2, and FIG 8 is a cross-sectional view taken
along line E-E
of FIG. 2.
A flame hole unit 100 of a gas burner in accordance with the present invention
has a structure in which a plurality of thin plates overlap and are assembled,
and is
characterized in that a path through which a mixed gas of a gas and air moves
is formed
inside the overlapping plates to be in communication with upper flame holes.
Referring to FIGS. 2 and 3, a burner flame hole unit 100 in accordance with an
exemplary embodiment of the present invention includes inner plates 110 (111,
112 and
113) in which a plurality of grooves 11 la having partially cut upper portions
are formed
at predetermined intervals, and outer plates 120 (121, 122, 123, 124, 125 and
126) in
which a plurality of grooves 121a and 122a having partially cut lower portions
are
formed at predetermined intervals to be vertically symmetrical to the grooves
11 l a
formed in the inner plates 110, and overlap and are coupled to both surfaces
of the inner
plates 110.
As shown, the grooves I l la, 121a and 122a are cut in substantially a "C"
shape
to be opened upward or downward so that, in a state in which the inner plates
110 and
the outer plates 120 overlap, the grooves l lla formed in the inner plates 110
are in
partial communication with the grooves 121a and 122a formed in the outer
plates 120 to
form a flow path of the mixed gas.
Meanwhile, as shown in FIG. 3, the inner plate 111 and the outer plates 121
and
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122 disposed at both sides of the inner plate 111 to overlap configure a set
of plates, and
sets of plates overlap to be repeatedly disposed in a multi-stage.
In addition, solid fixing plates 130 (131, 132, 133 and 134) overlap and are
coupled between the sets of plates.
The fixing plates 130 perform a function of forming gaps between flame holes
160 (161, 162 and 163) when the plates have different thicknesses, in addition
to a
function of forming the flow path of the mixed gas.
Here, mixed gas inlet ports 140 (141, 142, 143, 144, 145 and 146) are formed
at a
lower side of the burner flame hole unit 100 by gaps of the grooves 121a
andl22a of the
outer plates 120 between the fixing plates 130 and the inner plates 110.
The mixed gas introduced into the mixed gas inlet ports 140 is conveyed upward
to be gathered in inner spaces 151, 152 and 153 defined by the gaps of the
grooves 111a
of the inner plates 110 and the grooves 121 a and 122a of the outer plates 120
between
the fixing plates 130.
In addition, the mixed gas gathered in the inner spaces 151, 152 and 153 is
conveyed upward to be injected upward through flame holes 160 (161, 162 and
163)
formed by gaps of the grooves l l la of the inner plates 110 between the outer
plates 120.
According to the above-mentioned configuration, since the mixed gas introduced
through the two mixed gas inlet ports 141 and 142 is injected through the one
flame hole
161 and a cross-sectional area of the flame hole 161 is smaller than that of
the inner
space 151, the mixed gas can be rapidly injected through the flame hole 161.
Meanwhile, while the embodiment has been described as an example in which the
grooves I 1 I a formed in the inner plates 110 are opened upward and the
grooves 121 a
and 122a formed in the outer plates 120 are opened downward, on the other
hand, the
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grooves l lla formed in the inner plates 110 and the grooves 121a and 122a
formed in
the outer plates 120 may be opened downward and upward, respectively, in
different
directions. According to such a configuration, the mixed gas introduced into
the one
mixed gas inlet port is divided into the two flame holes to be injected.
In FIG. 6, reference numerals 141a to 146c designate mixed gas inlet ports
formed in a lateral direction, in FIG. 7, reference numerals 151a to 153c
designate inner
spaces formed in the lateral direction, and in FIG. 8, reference numerals 161a
to 163c
designate flame hole units formed in the lateral direction.
According to the flame hole unit structure of the gas burner in accordance
with
the present invention, since the plurality of plates overlap to form the path
of the mixed
gas to be in communication with the upper flame holes, deformation of the
flame holes
due to thermal stress can be minimized.
In addition, while the embodiment has a configuration in which the three sets
of
plates overlap, the number of sets of plates may be differently configured in
consideration of a maximum output amount of the gas burner.
The foregoing description concerns an exemplary embodiment of the invention,
is
intended to be illustrative, and should not be construed as limiting the
invention. The
present teachings can be readily applied to other types of devices and
apparatuses. Many
alternatives, modifications, and variations within the scope and spirit of the
present
invention will be apparent to those skilled in the art.
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