U.S. patent application number 14/723878 was filed with the patent office on 2015-12-03 for low cost burner.
The applicant listed for this patent is MABE, S.A. DE C.V.. Invention is credited to Roberto CABRERA BOTELLO.
Application Number | 20150345800 14/723878 |
Document ID | / |
Family ID | 54701303 |
Filed Date | 2015-12-03 |
United States Patent
Application |
20150345800 |
Kind Code |
A1 |
CABRERA BOTELLO; Roberto |
December 3, 2015 |
LOW COST BURNER
Abstract
A gas burner comprising a section for mixing combustible gas
with air; a cover lid closing the mixing section; and a crenellated
wall comprising first segments with a first thickness and one or
more second segments with a second thickness greater than the first
thickness, the second segment allows the cover lid to be sitting
and placed over the wall, and main portholes which are constant for
a determined length of said main portholes from an inside towards
an outside of the crenellated wall, and near the outside of the
crenellated wall, the height of the porthole is decreased by virtue
of an .alpha. angle; one or more secondary portholes with a size
smaller than the main portholes, wherein the at least one secondary
porthole has a change in direction in such a way, that the height
of the at least one secondary porthole decreases from the inside
towards the outside of the crenellated wall according to a .beta.
angle until the height of the porthole achieves a constant height
near the outside of the wall; and two or more tertiary portholes
per each first and second segment with a half cane shape, the
diameter of each half cane being equal to the width and depth of
said tertiary porthole, wherein said tertiary portholes are of
lesser size than the at least one secondary porthole.
Inventors: |
CABRERA BOTELLO; Roberto;
(Santiago de Queretaro, MX) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
MABE, S.A. DE C.V. |
Santiago de Queretaro |
|
MX |
|
|
Family ID: |
54701303 |
Appl. No.: |
14/723878 |
Filed: |
May 28, 2015 |
Current U.S.
Class: |
126/39E ;
431/354 |
Current CPC
Class: |
F23D 14/06 20130101;
F23D 14/64 20130101; F23D 2203/007 20130101; F23D 2900/00003
20130101; F24C 3/085 20130101 |
International
Class: |
F24C 3/08 20060101
F24C003/08; F23D 14/06 20060101 F23D014/06 |
Foreign Application Data
Date |
Code |
Application Number |
May 28, 2014 |
MX |
MX/A/2014/006384 |
Claims
1. A gas burner comprising: a mixing tube which allows the mixture
of a combustible gas with air; a pre-mixture chamber which receives
the mixture of the mixing tube, the pre-mixture chamber mixes the
combustible gas with the air; an inner crown which forms a barrier
between the pre-mixture chamber and a mixing chamber, the mixing
chamber formed by an outer wall of the inner crown, an inner face
of a wall opposite to the outer wall and by the upper face of the
gas burner; a crenellated wall along the length of the periphery of
the burner, the wall comprising a plurality of first segments with
a first thickness and at least a second segment with a second
thickness greater than the first thickness, the second segment
allows that a cover lid be seated and placed over the crenellated
wall thereby covering the mixing tube, the pre-mixture chamber, the
inner crown and the mixing chamber, and a plurality of main
portholes which are constant for a determined length of said main
portholes from the inside towards the outside of the crenellated
wall, and near to the outer part of the crenellated wall, the
height of the porthole is decreased by virtue of an .alpha. angle;
at least one secondary porthole with a smaller size than that of
the main portholes, wherein the at least one secondary porthole has
a change of direction in such a way that the height of the at least
one secondary porthole decreases from the inside towards the
outside of the crenellated wall according to a .beta. angle until
the height of the porthole achieves a constant height near the
outer part of the wall; and at least two tertiary portholes per
each first and second segment in a half cane shape, the half cane
diameter is equal to the width and depth of said tertiary porthole,
wherein said tertiary portholes are a smaller size than the at
least one secondary porthole.
2. The burner according to claim 1, wherein the burner comprises
some feet which lend the burner support over the face of a cover
lid of a stove, providing a space between said burner and said
face, thus allowing for free air flow.
3. The burner according to claim 1, wherein the inner crown has a
height which is greater than the pre-mixture chamber and the mixing
chamber, decreasing the distance between the base of the
pre-mixture chamber and an inner face of the cover lid, thus the
inner crown doses a mass flow of the mixture towards the mixing
chamber.
4. The burner according to claim 1, wherein the segments are
separated from each other by a main porthole or a secondary
porthole.
5. The burner according to claim 1, wherein the first thickness
varies between approximately 5 mm to 8 mm and wherein a second
thickness varies between approximately 8 mm to 10 mm, allowing that
said second thickness protrudes in relation to the remainder of the
crenellated wall, in such a way that the cover lid is adjusted over
the crenellated wall and has a set according to the crenellated
wall.
6. The burner according to claim 1, wherein the diameter of the
half cane of the tertiary portholes varies between approximately
0.8 mm to 3 mm and wherein the half cane has a cross cut section
selected from amongst straight, curved, squared, rectangular or
oval.
7. The burner according to claim 1, wherein the .beta. angle varies
between 45.degree. to 85.degree., wherein the height of the
constant part of the secondary porthole is between approximately 1
mm to 2 mm in height and wherein the length of the constant part of
the secondary porthole is not greater than 75% of the total length
of said secondary porthole.
8. The burner according to claim 7, wherein the flow of the mixture
which passes through an outer part of the secondary porthole
collapses against a bezel of the cover lid, anchoring the flame
dart provided by the secondary porthole upon creating a turbulence
area under said bezel.
9. The burner according to claim 1, wherein the constant length of
the main porthole is approximately 50% to 75% of the total length
of the main porthole, wherein .alpha. varies between 45.degree. to
85.degree., where a mass flow which travels through said main
porthole loses energy.
10. The burner according to claim 9, wherein a mass flow which
passes through an outer part of the secondary porthole collapses
against a bezel of the cover lid, anchoring the flame dart provided
by the main porthole upon creating a turbulence area under said
bezel.
11. The burner according to claim 1, wherein the burner under the
portholes set on the crenellated wall, an air ring is placed, which
drags the secondary air emanating from the lower part of the
burner.
12. A gas burner comprising: a section for mixing the combustible
gas with air; a cover lid closing the mixing section; and a
crenellated wall comprising a plurality of first segments with a
first thickness and at least a second segment with a second
thickness greater than the first thickness, the second segment
allows the cover lid to be sitted and placed over the wall, and a
plurality of main portholes which are constant for a determined
length of said main portholes from the inside towards the outside
of the crenellated wall, and near to the outer part of the
crenellated wall, the height of the porthole is decreased by virtue
of an .alpha. angle; at least one secondary porthole with a smaller
size than that of the main portholes, wherein the at least one
secondary porthole has a change of direction in such a way that the
height of the at least one secondary porthole decreases from the
inside towards the outside of the crenellated wall according to a
.beta. angle until the height of the porthole achieves a constant
height near the outer part of the wall; and at least two tertiary
portholes per each first and second segment in a half cane shape,
the half cane diameter is equal to the width and depth of said
tertiary porthole, wherein said tertiary portholes are a smaller
size than the at least one secondary porthole.
13. The burner according to claim 12, wherein the inner crown has a
height greater than the pre-mixture chamber and the mixing chamber,
decreasing the distance between the base of the pre-mixture chamber
and an inner face of the cover lid, so that the inner crown doses a
mass flow of the mixture towards the mixing chamber.
14. The burner according to claim 12, wherein the first thickness
varies between approximately 5 mm to 8 mm and wherein a second
thickness varies between approximately 8 mm to 10 mm, allowing that
said second thickness protrudes in relation to the remainder of the
crenellated wall, in such a way that the cover lid is adjusted over
the crenellated wall and has a set according to the crenellated
wall.
15. The burner according to claim 12, wherein the diameter of the
half cane of the tertiary portholes varies between approximately
0.8 mm to 3 mm and wherein the half cane has a cross cut section
selected from amongst straight, curved, squared, rectangular or
oval.
16. The burner according to claim 12, wherein the .beta. angle
varies between 45.degree. to 85.degree., wherein the height of the
constant part of the secondary porthole is between approximately 1
mm to 2 mm in height and wherein the length of the constant part of
the secondary porthole is not greater than 75% of the total length
of said secondary porthole and wherein the mass flow which passes
through an outer part of the secondary porthole collapses against a
bezel of the cover lid, anchoring the flame dart provided by the
secondary porthole upon creating a turbulence area under said
bezel.
17. The burner according to claim 12, wherein the constant length
of the main porthole is approximately 50% to 75% of the total
length of the main porthole, wherein .alpha. varies between
45.degree. to 85.degree., where a mass flow which travels through
said main porthole loses energy and wherein the mass flow which
passes through an outer part of the main porthole collapses against
a bezel of the cover lid, anchoring the flame dart provided by the
main porthole upon creating a turbulence area under said bezel.
18. The burner according to claim 12, wherein the burner under the
portholes set on the crenellated wall, an air ring is placed, which
drags the secondary air emanating from the lower part of the
burner.
19. A stove, kitchen or cooking surface comprising the burner of
any of the prior claims, wherein the stove, kitchen or cooking
surface additionally comprise a grill set over the burner, and
wherein the at least one secondary porthole emits a flame dart
which has a greater size than that of a flame dart from the main
porthole, in such a way that the flame dart of the secondary port
hole does not collapse against the grill.
20. The stove, kitchen or cooking surface according to claim 19,
wherein the design of the grill determines the number of secondary
portholes found in the crenellated wall of the burner.
Description
FIELD OF THE INVENTION
[0001] Present invention lies in the field of gas burners,
particularly burners used in household appliance equipment, such as
stoves, kitchens or cooking surfaces.
BACKGROUND OF THE INVENTION
[0002] A great variety of burners can be found in the marketplace
for use in household appliances or industrial ones based on an
atmospheric Bunsen burner; initially, the main objective of these
was to provide a flame which would turn on over the utensils to be
heated; achieving this without considering efficiency aspects of
the combustibles used in the heating or ecologic oriented aspects,
heating speed, the shape of the cooking utensils, among others,
through time the design of the burners has evolved towards the
solving of the above mentioned aspects.
[0003] Currently, a considerable amount of burners for use in
household appliances exists in the marketplace; initially, the main
objective of these was to provide a flame which would turn on over
the utensils to be heated without considering efficiency aspects of
the combustibles used in the heating or ecologic oriented aspects;
through time the design of the burners has evolved towards the
solving of the above mentioned aspects, among others.
[0004] As background to the present invention, applicant has
knowledge of the below discussed documents.
[0005] In patent application with publication number EP 0 554 511
an atmospheric gas burner is described which has a primary air
pre-mixer, with a ring burner which has exit gas ducts and a cover
for the burner, designed should it be appropriate as a single piece
with the ring, as a solution proposed for atmospheric burners in
particular as the NO.sub.x content in the burn gas which is
produced, as well as the CO content are both considerably reduced,
and particularly within a very broad adjustment range between the
open and closed positions. The above is achieved thanks to the
central axis of the exit ducts for the gas have a 0.degree.
deviation angle in regards to an assigned radius to the respective
exit opening.
[0006] In U.S. Pat. No. 1,598,996 gas burners for general use are
described in which the inner parts are freely accessible, through
which the burner is adapted to be easily and quickly cleaned in
order to eliminate carbon deposit residues as well as grease and
other residues. Similarly this burner is provided with an upper
cover lid which can be removed off the burner for the previously
described purposes, and at the same time, it is set with a firm
connection which seals the body of the burner against any
possibility of a combustible leak between the contact surface of
the cover lid and the body of the burner. Additionally, the burner
is provided with two parts in which the body of the burner is
coupled unto a mixing tube which is adapted to be removed in a
slideable manner. The burner is provided with means to ensure a
mixture of air and combustible prior to ignition and burning of the
combustible, in order to decrease the carbon deposits to a minimum
and produce a flame at the highest possible intensity.
[0007] Document U.S. Pat. No. 7,731,493 by Sartine et al describes
a circular Bunsen burner for household use, which comprises a
pattern of a main porthole through a secondary porthole and through
this be able to form the porthole crown of a circular wall, wherein
thanks to this highly simplistic design, it presents the serious
problem that the speed at the portholes is very high, especially at
the main porthole, this, such as the document itself indicates,
creates flame detachment or a poor anchoring of the flame dart on
the crown of the burner, which causes a poor combustion in addition
to the flame of the crown has a high tendency to shut itself off;
to partially solve this problematic aspect the inventor relates
that he set a step on the periphery of the crown of the burner for
enlarging the lower diameter of the crown of portholes; with such
luck that the discussed peripheral step is in fluid contact with
the porthole, preferably with the main portholes, with the end
purpose of lengthening the duct of the main porthole in some
manner, through the implementation of the referred to peripheral
step, with this the inventor attempts to lower the speed of the
mixture within the porthole, which clearly seems to have low
functionality, impractical and inefficient, knowing that a better
porthole design is required in order to avoid the flame from
tending to detach, given that as the inventor points out himself in
the document under discussion, the stability of a flame is a
function of: i) the speed of combustion of the air-combustible
mixture; ii) the mass reason of the air-combustible mixture; iii)
the total area of porthole of the crown of the burner; which ends
up being a bit contradictory upon studying the discussed document
that the inventor knows the theory but upon implementing his burner
to practice, he completely ignores said principles by creating
completely straight portholes without any means whatsoever for
efficiently controlling the speed of the air-combustible mixture
which flows through the portholes, thereby being forced to use a
widely known solution in the field to create a little extra
friction which will allow for a small decrease in the speed of the
air-combustible mixture, by means of the referred to peripheral
step through which means it can in a palliative manner poorly
anchor the flame dart onto the crown; continuing on with the study
of the referred to crown, it can also be seen that the design
proposed by the inventor of the document under discussion alleges
and presumes that his design allows him to use a cover lid of
almost the same diameter of that of the crown, which seems obvious
that such a design stimulates the separation of the flame dart from
the crown, which leads us to think that the burner in reference
lacks all usefulness or practical functionality.
[0008] Regarding the burners contained in the above cited
documents, none of them has the structural and operational features
of the burner in present invention, for example, none of the prior
burners possesses at least two air-combustible mixture sections
which would allow the adequate mixing or combining of the air with
the combustible, also the referred to mixture sections allow for
the creation of a desirable mass flow towards the portholes in
order that the speed of the flow of the mixture be such that it
avoids the detaching of the flame, the dart remaining anchored to
the burner furthermore encouraging an efficient combustion; also
none of the prior documents references a particular design for the
portholes which changes the direction of the mass flow of the
air-combustible mixture, decreasing the speed of the referred to
mass flow within the porthole, in addition to strategically
directing it towards the utensils to be heated which are set on the
burner; thereby guaranteeing correct anchoring of the flame dart to
the body of the burner as well as optima combustion.
[0009] One aspect of present invention may be to provide a burner
with at least two mixture sections, a pre-mixing area precisely at
the end of the Venturi tube which helps in the mixing of the
air-combustible which has been dragged by means of the Venturi
tube, also said pre-mixing chamber helps to uniformly dosage the
determined mass flow to the mixture chamber which surrounds the
pre-mixture chamber, in this second chamber the possible flow
variations which could occur when functioning as a buffer area are
homogenized, helps continue the air-combustible mixture towards the
porthole section, with such luck that the speed of the liquid
within the portholes be uniform and within a determined parameter
which avoids flame detachment.
[0010] Another aspect of the present invention may be constituted
by providing a burner which on its main portholes contain a change
of direction which allow for the decreasing and controlling of the
mass flow of the air-combustible mixture which flows within this in
addition to strategically directing the flame dart, avoiding the
detachment of flame and thus favoring a correct as well as an
efficient combustion, in addition to helping achieve a better
contact of the flame darts with the utensils to be heated which are
set over the burner.
[0011] Another aspect of present invention may be to provide a
burner with a peculiar design for the cover lid of the burner which
allows interacting with the novel porthole design, helping to
correctly anchor the flame darts to the body of the burner.
[0012] Another aspect of the present invention may be to provide a
burner with good energy efficiency, as well as low carbon monoxide
levels, be easy to manufacture and have a low cost.
[0013] Yet another aspect of the present invention may be to
provide the burner with at least one air ring on the lower part of
the burner, precisely under the porthole for improving the
secondary air mass flow towards the base of the flames.
BRIEF DESCRIPTION OF THE INVENTION
[0014] Present invention lies in the field of gas burners,
particularly Bunsen burners used in household appliance equipment,
such as stoves, kitchens or cooking surfaces; if there is a large
variety of these burners both in the marketplace as well as in the
state of the art, these are quite difficult to conceive and put
into practice, given that they require extensive laboratory tests
as well as advanced knowledge in the areas of combustion, fluids,
heat transfer and mechanics among others; having a burner which
works is an art in itself, and even more difficult is making a
burner which functions in an efficient manner, and even further
difficult is achieving all this at a low cost, as this implies
advanced knowledge of manufacturing processes. So that given the
above described, it is evident that the burner of present invention
has been particularly difficult to conceive, put into practice and
commercialize, as it has been optimized in all of its aspects, as
it renders both good energy combustion efficiency, it is easy to
manufacture, the construction materials have been optimized to
achieve a burner with low cost materials, in addition to being
visually attractive.
[0015] The burner object of present invention is formed on a base
of some metallic material preferably aluminum, or with an alloy
which contains aluminum, the body of the burner is achieved by
injection or forging; the cover lid by die cutting or casting iron,
forging, sintering, among others, which preferably is manufactured
with steel, the burner does not have any moving parts, nor does it
require another assembly other than the cover lid which is only set
on the peripheral crenellated wall of the cylindrical wall of the
portholes.
[0016] On the lower part of the burner an inlet is set through
which the combustible being expulsed is allowed out, the inlet is
directed towards a Venturi tube set on the lower central part of
the burner, the referred to Venturi tube drags the primary air
found surrounding this and suctions it towards the inside part of
the tube to lead in a fluid manner, the primary air which has been
dragged by the combustible towards the pre-mixing chamber which
helps mix the air-combustible which has been dragged by means of
the Venturi tube. Said pre-mixing chamber also helps to uniformly
dosage a determined mass flow to the mixture chamber which
surrounds the pre-mixture chamber. In this second chamber the
possible flow variations which could occur upon homogenizing the
volume of the air-combustible mixture before entering the portholes
become uniform, knowing that a type of peripheral ring is formed,
which homogenously distributes the air gas mixture to the
portholes, it also regulates the energy of the fluid of said
air-combustible mixture, thus homogenously dosing a mass flow
towards the portholes which helps to continue with the mixing of
the air-combustible, dosing the mixture of the air-combustible
towards the porthole section, with such luck that the speed of the
fluid within the portholes be uniform and within a determined
parameter which avoids flame detachment; the main portholes on
their part are set with a peculiar design, knowing that the
referred to portholes change direction of the mass flow of the
air-combustible mixture which emanates from the mixture chamber
which forces a decrease in the speed of the referred to mass flow
within the porthole, in addition to strategically directing it
towards the utensils to be heated set on the burner; thereby
guaranteeing correct anchoring of the dart flame to the body of the
burner as well as optimal combustion. Precisely under the
portholes, on the lower part or outer base of the body of the
burner, present invention can be set with an air ring, said air
ring allows for the improving of the secondary air flow towards the
base of the flame.
BRIEF DESCRIPTION OF THE FIGURES
[0017] The illustrated embodiment may be described referencing the
accompanying figures, which:
[0018] FIG. 1 shows an isometric view of the burner set over a
volcano with a grill.
[0019] FIG. 2 is an exploded view of the burner assembly.
[0020] FIG. 3a is an isometric upper view of the body of the
burner.
[0021] FIG. 3b is a lower conventional perspective view with the
burner body cut by one of its secants.
[0022] FIG. 4 shows a cross cut of the assembly of the burner in
which the air flows, combustible and air-combustible mixture can be
seen.
[0023] FIG. 5 shows an isometric view of the body of the burner,
showing in detail the crenellated wall, the three types of
portholes as well as how they are set over the referred to
crenellated wall.
[0024] FIG. 6 is a cross cut of the secondary porthole, where its
shape can be appreciated, as well as the secondary air flows in
addition to the air-combustible mixture.
[0025] FIG. 7 is a cross cut of the main porthole where its shape
can be appreciated, as well as the secondary air flows in addition
to the air-combustible mixture.
[0026] All figures have been drawn to help ease the basic
explanation of the teachings of present invention. The Figure
extensions, regarding their number, position, relation and
dimensions of the parts to form the preferred embodiment(s) shall
be explained or will lie within skillfulness of the art once having
read and understood the teachings of present invention.
Additionally, the exact dimension and dimensional proportions to
grant strength, weight and specific requirements will also be
within the skillfulness of the art after having read and understood
the teachings of present invention.
DETAILED DESCRIPTION OF THE INVENTION
Definitions
[0027] The use of the term "approximately" provides an additional
determined range. The term is defined in the following manner: the
additional range set by the term is approximately .+-.10%. By way
of example, but not in a limitative way, if the term reads
"approximately 8 cm", the exact range lies within 7.2 to 8.8
millimeters.
[0028] FIG. 1 illustrates the burner 25 object of present
invention, set over a surface or cover 19, the referred to cover 19
preferably comprises a volcano 28 which is understood as a
truncated cone protuberance in a volcano manner over which the
burner 25 is placed, in an alternative embodiment of present
invention, the cover 19 can be completely smooth, or lacking
volcanoes; given this the burner 25 is placed flush in regards to
the cover 19; in another alternative embodiment the cover 19 can
have crammed recesses in truncated conical shape which can house
the burner 25. In either case, over the burner assembly 25 (with or
without volcano 28) a grill 27 is placed, which comprises a series
of bars which extend over the burner 25 and which help support the
kitchen utensils to be heated; the distance between the grill 27 to
the burner 25 will have to be determined experimentally in addition
to complying with the official requirements for each country, which
obviously will affect their design. For the design of a burner 25,
it is desirable to have a grill design 27, this desired pairing
would be good to consider for the combustion efficiency tests,
knowing that the bars of the grill 27 are over the burner 25 it is
prudent to design portholes on purpose for such a situation, reason
for which the burner 25 of present invention comprises a series of
secondary portholes 30 with a reduced dart which allows for the
transfer of the flame between portholes (20, 30, 40) without
excessively heating the bars of the grill 27 which helps save
combustible as well as improving the combustion, given that without
these considerations, the flame dart would be cast on the lower
part of the bar of the grill 27 overheating the latter in addition
to obtaining adverse results for the combustion given the
obstruction, which decreases the efficiency of the burner.
[0029] Now then, FIG. 2 shows us an exploded view of the burner 25;
and FIG. 4 shows us an isometric cross cutoff of the burner 25
assembly; both figures are useful for describing the assembly
components. On the lower part of FIG. 2 the nozzle 14 can be seen
which on its lower end is coupled to the tube 14 which transports
the combustible. The nozzle 14 on its outer periphery comprises a
rope on which a mini-connector 15 is coiled, the mini-connector 15
and nozzle 14 assembly is fastened onto the lower part of the
support 16, thanks to the referred to support 16 comprising a hole
in the lower part through which the mini-connector 15 and nozzle 14
assembly is introduced, to later have a nut coiled over a mini
connector 15; this assembly is coupled to the lower face of the
volcano 28 by means of some screws or another fastening means 17.
The volcano 28 on its upper face comprising a hole at the center of
it through which the Venturi tube 12 of the burner 25 is
introduced, which is concentrically aligned with the nozzle 14
leaving a determined height between the referred to nozzle 14 and
the lower part of the Venturi tube 12 which allows aspirating or
dragging the primary air, once combustible has been made to pass
through the nozzle 14, given the Venturi effect caused there.
[0030] The lower face of the burner 25 is set with some feet 31
which lend the burner 25 support over the upper face of the volcano
28, allowing for the creation of a gap or space between the lower
face of the burner 25 and the upper face of the volcano 28, which
allows for free air flow, which partly aids in cooling the base of
the burner 25 as well as being able to supply air in a uniform
manner to the base of the burner 37. The burner 25 is also set with
a spark plug 22 set on a particular point of its periphery, with
such luck that the burner 25 has been provided with a grommet 38
which is to house the spark plug 22; the referred to spark plug 22
is fastened in place by means of a safety 38 and support 41 in "U"
shape; the complete burner 25 assembly discussed above is crowned
with the cover lid 10, which itself is placed only on the
crenellated wall or porthole wall 26.
[0031] Now we turn our attention to FIGS. 3a, 3b and 4 which
illustrate the body 11 of the burner 25; FIG. 3a is an isometric
upper view of the referred to body 11; on its part FIG. 3b is a
lower isometric view with the burner body cut on the crenellated
wall 26 which allows us to see the different portholes (20, 40);
FIG. 4 shows an isometric cross cut of the assembly of the burner
in which the air flows, combustible and air-combustible mixture can
be seen. From these figures we highlight the Venturi tube 12
situated on the lower part of the body 11, which is in fluid
connection with the pre-mixing chamber 23 which surrounds the duct
on the upper part of the Venturi tube 12, the inner crown 35 is
found in ring-like shape, which protrudes cylindrically over the
base of the pre-mixing chamber 23. The referred to inner crown 35
decreases the distance or gap between the base of the pre-mixture
chamber 23 and the lower face of the cover lid 10. Now then, it
should be highlighted at this point that the combustible emanating
from the nozzle 14, drags the primary air which exists in the
vicinity of the lower part of the Venturi tube 12 given the Venturi
effect, so that the air and the combustible have not fully mixed.
Thereby, upon arriving at the pre-mixing chamber 23, thanks to the
barrier formed by the inner crown 35 is conducive to fluid composed
of air as well as combustible having a first opportunity to mix
together. Also, the referred to inner crown 35 helps dosing the
mass flow of the air-combustible mixture towards the mixture
chamber 24; knowing that once the air-combustible is pre-mixed in
the pre-mixture chamber 23, air-combustible the pre-mixture has to
pass between the upper face of the inner crown 35 and the lower
face of the cover lid 10, in said narrowness the speed of the mass
flow of the pre-mixture increases, which causes the referred to
pre-mixture mass flow arrive at the mixture chamber 24 with a
desirable speed and in a uniform manner. The referred to mixture
chamber 24 is formed on its lower part by the upper exposed face of
said mixture chamber 24, one side is formed by the outer wall of
the inner crown 35, the remaining side formed by the inner face of
the crenellated wall 26. This mixture chamber 24 encourages the
mixing on the air-combustible and also functions as a uniform area
for the air-combustible mixture in a reservoir-like fashion;
similarly, another function is that of homogenizing the speed and
pressure of the mass flow of the air-combustible mixture prior to
entering the portholes, knowing that: it creates a type of
periphery ring which itself distributes uniformly the air gas
mixture towards the portholes (20, 30, 40). The mixture chamber 24
also regulates the flow energy of said air-combustible mixture,
through which it obtains a desirable mass flow speed of the
air-combustible mixture towards the portholes (20, 30, 40).
[0032] FIGS. 5, 6, 7 are useful to be able to see the porthole
shapes (20, 30, 40); for its part FIG. 5 is a segment in isometric
of the body of the burner 11, in which the crenellated wall 26 can
be seen which surrounds the periphery of the body of the burner 11,
it is over the referred to crenellated wall 46 that the three
different types of portholes are formed, which the burner 25 object
of present invention comprises; it should be highlighted at this
point that the crenellated wall 26 can comprise two thicknesses
measured from the inner face towards the outer face of the referred
to crenellated wall 26 exactly at the sections of crenellated wall
26 which house the tertiary portholes 40 and which are separated
from each other by a main porthole 20 or by a secondary porthole
30, such as can be seen in FIG. 5. Now then, the first thickness
called "e1" which has a preferable width which is used in the large
majority of the sections which form the crenellated wall 26; said
thickness varies between approximately 5 mm to 8 mm; the second
thickness called "e2" is used in a sporadic manner over the
periphery which runs the crenellated wall 26, said thickness varies
between approximately 8 mm to 10 mm. The fact of having a segment
of the crenellated wall with a different thickness, that is
"e1"<"e2" allows that "e2" which is thicker to protrude over the
rest of the crenellated wall 26 which has a "e1" thickness and in
this way be able to adequately sit the cover lid 10 over the crown
of the burner or over the crenellated wall 26 allowing to
adequately adjust and having a desirable set, knowing that the
cover lid as well as the burner suffer thermal expansion during
their operation, so that in the preferred embodiment of the
invention at least three segments of crenellated wall 26 having an
"e2" width which allows pertinent support to the cover lid over the
crenellated wall 26; leaving the ability to use any number of
segments with an "e2" thickness to an alternative embodiment.
Following the same order of ideas, the crenellated wall 26 is
composed of the referred to sections which house the tertiary
portholes 40, in this highly peculiar design for the crenellated
wall 26 object of present invention at least two tertiary portholes
40 per segment are required, having the possibility of having more
than two in an alternative embodiment of the present invention. The
referred to tertiary portholes in a preferred embodiment have a
"half cane" shape, which is set over the upper face of a determined
segment of the crenellated wall 26, where the diameter of the half
cane is equal to the width and depth of the porthole, which varies
between approximately 0.8 mm to 3 mm. The referred to tertiary
portholes 40 in half cane have a straight transversal section thus
allowing for the passage of the air-combustible mixture emanating
from the mixture chamber 24, without any greater restriction than
that set by its shape as well as its location. In an alternative
embodiment of the present invention the half cane shape can be a
trapezoidal, square, rectangular, oval or almost any other type of
shape section channel, these portholes conserve this porthole area
which itself is very similar to the obtained in the preferred
embodiment (half cane). Now then, the secondary portholes 30 which
are used sporadically over the crenellated wall 26 such as can be
seen in FIGS. 3a, 5 just like the main portholes 20 in the same
way, help to separate the segments of the crenellated wall 26 which
house the tertiary portholes 40. The secondary portholes 30 which
have a smaller size than the main portholes 20 but are larger than
the tertiary portholes 40 follow the same shape than that of the
grill 27, so that its location within the crenellated wall 26 will
completely depend on the design of the grill 27 which is set on the
burner 25. Now then, having a series of secondary portholes 30
allows for energy savings knowing that the referred to secondary
portholes 30 will serve to create transfer flame darts, that is the
being able to transfer the flame form a tertiary porthole 40 in a
given segment of the crenellated wall 26 to another tertiary
porthole 40 located in an adjacent segment of the crenellated wall
26, thereby allowing for correct transfer of the flame over the
outer periphery of the crenellated wall 26. In this way, the
secondary porthole 30 emits a smaller sized dart which is not
collapsible with the finger or part of the grill 27 which is found
set over the burner 25, with such luck that the design of the grill
27 will determine the number of secondary portholes 30 which are
located within the crenellated wall 26. Turning our attention to
FIG. 6 it can be seen that this illustrates a cross cut of the
referred to secondary porthole 30; here we can see that unlike the
tertiary portholes 40, the secondary porthole 30 is not straight,
but rather it has a change of direction, which causes the mass flow
of air-combustion mixture which emanates from the mixture chamber
24 and which moves within the referred to secondary porthole 30, in
this way the height of the porthole decreases from the inside
towards the outside of the crenellated wall 26, following a .beta.
angle which varies between approximately 45.degree. to 85.degree.,
as long as the porthole height has a constant determined height
which varies between approximately 1 mm to 2 mm and does not exceed
75% of the total length of the secondary porthole 30, which causes
the air-combustible mixture to increase its speed but only allows
the passage of a determined mass flow with a certain speed and
direction, the latter being specifically horizontal. In this
manner, the flow which passes through the straight horizontal
throat at the end of the secondary porthole 30 collapses against
the bezel of the cover lid 10, which allows for correctly anchoring
of the flame dart set by the secondary porthole 30, knowing that an
area of turbulence is created exactly under the referred to bezel
33, which forces the mass flow of the air-combustible mixture
emanating from the secondary porthole 30 to go downwards to later
go up, thereby successfully anchoring the flame dart to the burner
25; coupled to that discussed above in reference to the secondary
porthole 30, one must keep in mind that we want to achieve a short
flame dart which promotes an efficient transfer of flame between
the tertiary portholes 40, obviously avoiding flame detachment or
poor combustion.
[0033] Now turning our attention the main portholes 20 whose cross
cut is illustrated in FIG. 7; the referred to main portholes 20
have a somewhat inverse shape to that outlined of the secondary
portholes 30 where the height of the main porthole 20 remains
constant for a good section of the length preferably from
approximately 50% to 75% of the length of the main porthole 20,
thus for the remaining length the heights is decreased at an
.alpha. angle, which varies between approximately 45.degree. to
85.degree., which causes a brusque change of direction of the mass
flow of air-combustible which travels from the main porthole 20
emanating from the mixture chamber 24, said radical change of
direction causes the mass flow which travels from the main porthole
20 to lose energy; the change of direction also directs the flame
towards the utensils to be heated set over the grill 27 and the
burner 25, it can also be noted that the air-combustible mass which
moves through the upper part of the main porthole 20 exactly upon
exiting the referred to main porthole 20 collapses with the lower
face of the bezel 33 of the cover lid 10, which causes that
precisely under the bezel at the exit area of the main porthole 20,
a turbulence area be generated which makes the flame dart emitted
by the main porthole 20 be able to correctly anchor. Therefore, the
shape of the porthole in a burner is such that it allows good exit
speed which allows the flame dart to be cast upon the surface to be
heated, seeing that having high speed ranges would encourage flame
detachment, or conversely, having a slow speed for the flame would
cause poor combustion as well as a low transfer level of caloric
energy to the utensils to be heated. Therefore, the equilibrium
achieved by such an ingenious shape of portholes (20, 30, 40)
proposed, knowing that variables in direction and speed of mass
flow of the air-combustible mixture which moves through the
referred to portholes (20, 30, 40); thus achieving an efficient
combustion, avoiding the much unwanted flame detachment in a burner
which has ease of manufacture and therefore low cost.
[0034] In an alternative embodiment of the present invention on the
base or the lower part of the body of the burner 11 exactly below
the lowest part of the exits of the main portholes 20 set over the
outer face of the crenellated wall 26, an air ring 36 can be
placed, which (such as can be seen in FIGS. 6, 7) allows admitting
an extra mass of secondary air towards the flame dart obtained by
the portholes 20, 30 since the flame dart tends to drag the
secondary air towards its surroundings. Thereby given the
superficial cap limit effect the dart, emitted by the referred to
portholes 20, 30 will tend to drag the secondary air which emanates
from the base or lower part of the burner 11. The referred to
alternative embodiment is desirable when for design reasons the
volcano 28, the grill 27 or jointly as a set the cook top or cover
lid 19 have a burner body with a greater diameter than that
obtained through the preferred embodiment, thus in order to be able
to "enlarge" the base of the burner, the air ring 36 can be used
which allows supplying "extra" secondary air towards the portholes
20, 30 thus contributing a better combustion for the burner 25. The
alternative embodiment currently discussed can also be desirable
when for design reasons the cook top or cover lid 19 ends up sunken
or submerged, this because the referred to cover lid 19 has very
high walls on its periphery, which causes certain difficulty in
obtaining a mass flow of secondary air towards the dart flames;
similarly, the alternative embodiment under discussion is desirable
when very large utensils are placed over the grill 27; or in
another case, when the grill design is such that it hinders or
obstructs the mass flow of secondary air towards the flame darts of
the burner 25 to a great degree; but in either case, it is noted
that the constant is a restriction of mass flow of secondary air
towards the flame darts of the burner 25. To this end, the air ring
36 serves present invention well knowing that when the flame darts
do not have sufficient secondary air surrounding the dart, the
flame will tend to seek secondary air, which then causes the
detachment of flame dart from the body of the burner 25, same which
can cause a leak of the air-combustible mixture, a dangerous
accumulation of air-combustible mixture between the cover lid 19
and the lower face of the cooking utensil or in a better case the
combustion is carried out far away from the body of the burner.
This phenomenon is known in the field as flame flotation, given
that upon seeing how the flame darts deform, these appear to float
upon completely detaching themselves from the body of the burner 25
in search of secondary air which they require to achieve a flame.
Now then, the referred to air ring 36, thanks to the superficial
cap limit, helps in preventing to a large degree the flame dart
flotation phenomenon, emanating from the secondary air supply which
is found close by to the lower part of the burner 25 in addition to
that which is found flush with the cover, therefore FIGS. 6, 7
serve as visual support to help understand the referred to mass
flow of secondary air towards the darts or flame base of the burner
25.
[0035] Having described present invention with sufficient detail,
it is found as having an inventive grade, novelty and its
industrial application being obvious, and taking into account that
a person skilled in the art could infer changes to the burner
object of present invention hereby described, where said changes
would be comprised within the protection scope of the following
claims.
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