U.S. patent application number 16/393989 was filed with the patent office on 2020-10-29 for fuel injector fixation.
The applicant listed for this patent is BSH Hausgerate GmbH, BSH Home Appliances Corporation. Invention is credited to Chris Corbin, Daniel Davison, Timothy Russell, Brian Silva, Tyson White.
Application Number | 20200340675 16/393989 |
Document ID | / |
Family ID | 1000004051671 |
Filed Date | 2020-10-29 |
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United States Patent
Application |
20200340675 |
Kind Code |
A1 |
Corbin; Chris ; et
al. |
October 29, 2020 |
FUEL INJECTOR FIXATION
Abstract
Improvements for a gas burner bar are provided utilizing reduced
parts, easier assembly, and greater reliability. In one or more
implementations a portion of an air shutter is disposed between two
parts of an injector assembly: an injector and an injector fitting.
Assembly in this manner results in proper alignment of the injector
assembly thus negating problems that arise with misalignment.
Inventors: |
Corbin; Chris; (LaFollette,
TN) ; Davison; Daniel; (Knoxville, TN) ;
Russell; Timothy; (Jacksboro, TN) ; Silva; Brian;
(Knoxville, TN) ; White; Tyson; (Anderson,
TN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
BSH Home Appliances Corporation
BSH Hausgerate GmbH |
Irvine
Munich |
CA |
US
DE |
|
|
Family ID: |
1000004051671 |
Appl. No.: |
16/393989 |
Filed: |
April 25, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F24C 3/087 20130101 |
International
Class: |
F24C 3/08 20060101
F24C003/08 |
Claims
1. A gas burner bar, comprising: a burner; a Venturi tube attached
to the burner; an air shutter attached to the Venturi tube, the air
shutter having an opening; an injector, the injector situated
through the opening of the air shutter; and an injector fitting,
the injector fitting attached to the injector.
2. The burner bar of claim 1, wherein the burner has a burner
region with a plurality of combustion points.
3. The burner bar of claim 1, wherein the air shutter has a
secondary opening for the entry of air into the gas burner bar.
4. The burner bar of claim 1, wherein a portion of the air shutter
is disposed between the injector fitting and the injector.
5. The burner bar of claim 4, wherein the air shutter has a
threadless, raised opening.
6. The burner bar of claim 4, wherein the injector is flush against
the portion of the air shutter.
7. The burner bar of claim 4, wherein the injector has an opening
that is collinear with the Venturi tube.
8. The burner bar of claim 3, further comprising: a gas line
attached to the injector fitting to provide a fuel gas; and a
regulator attached to the gas line to regulate flow of the fuel
gas.
9. The burner bar of claim 8, wherein the fuel gas enters a mixing
face of the air shutter through the nozzle, mixes with air from the
secondary opening of the air shutter, passes through the Venturi
tube as an air/gas mixture, and combusts at the burner.
10. A cooking appliance, the cooking appliance comprising: a
cooking cavity; and a gas burner bar disposed in the cooking
cavity, the gas burner bar comprising: a burner, a Venturi tube
attached to the burner, an air shutter attached to the Venturi
tube, the air shutter having an opening; an injector, the injector
situated through the opening of the air shutter; and an injector
fitting, the injector fitting attached to the injector.
11. The cooking appliance of claim 10, wherein the gas burner bar
is operated as a bake burner.
12. The cooking appliance of claim 10, wherein the gas burner bar
is operated as a broil burner.
13. The cooking appliance of claim 10, wherein the air shutter has
a secondary opening for the entry of air into the gas burner
bar.
14. The cooking appliance of claim 10, wherein a portion of the air
shutter is disposed between the injector fitting and the
injector.
15. The cooking appliance of claim 15, wherein the injector has an
opening that is collinear with the Venturi tube.
16. The cooking appliance of claim 13, the gas burner bar further
comprising: a gas line attached to the injector fitting to provide
a fuel gas; and a regulator attached to the gas line to regulate
flow of the fuel gas.
17. The burner bar of claim 13, wherein the fuel gas enters a
mixing face of the air shutter through the nozzle, mixes with air
from the secondary opening of the air shutter, passes through the
Venturi tube as an air/gas mixture, and combusts at the burner.
18. A mixing unit for a gas burner, the mixing unit comprising: an
injector fitting; an air shutter disposed against the injector
fitting; and an injector disposed in the air shutter opposite the
injector fitting and engaged with the injector fitting through an
opening in the air shutter.
19. The mixing unit for the gas burner of claim 18, further
comprising: a Venturi tube attached to the air shutter and disposed
both opposite from and collinear to the injector.
Description
FIELD OF TECHNOLOGY
[0001] The present technology relates to improvements in gas
burners.
BACKGROUND
[0002] Gas burner assemblies are used in traditional gas cooking
ranges in both broiler and baking configurations. Traditionally
these gas burner assemblies are comprised of several components,
including a gas burner, a Venturi tube, an air shutter, an injector
fitting and an injector.
[0003] Traditionally the injector is secured to the injector
fitting and the injector fitting is secured to the air shutter.
However, this solution does not ensure the alignment of the
injector to the Venturi tube and misaligns the orifice of the
injector in mixing face. Alternative solutions utilize a floating
injector that sits in the air shutter, however this solution
provides no fixation or consistency in results.
[0004] These traditional methods of assembly are problematic
because misalignment of the injector can result in malfunction of
the gas burner assembly which can manifest in the creation of soot,
flashback, and flame lifting. Furthermore these traditional methods
of assembly use several components, any variation of which or
misassembly of can result in misalignment.
[0005] Accordingly, what is needed is a way to reliably and
repeatedly ensure proper alignment of the injector and the injector
fitting when fixing the combination to the air shutter of a gas
burner.
BRIEF SUMMARY
[0006] The present invention is directed to improvements in gas
burners. These improvements include reduced part counts in injector
assemblies, increased reliability, easier assembly, and a reduction
in misaligned gas burner problems.
[0007] The invention is an improved injector assembly that is
constructed out of two components: an injector fitting and an
injector. During assembly the injector is passed through the
opening of the air shutter and threaded into the injector fitting.
As a result, the air shutter is sandwiched between the injector and
the injector fitting, resulting in a flush placement of the
injector against either the wall or raised opening of the air
shutter. Furthermore this method of engagement holds the air
shutter and the injector assembly in proper position with fewer
chances of erroneous placement.
[0008] These improvements to the injector assembly allow for an
improved gas burner that uses fewer parts, is easier to assemble,
has increased reliability, and a marked reduction in problems that
arise from a misaligned injector including, but not limited to,
flashback, flame lifting, and increased soot.
[0009] Various other objects, features, aspects, and advantages of
the present invention will become more apparent to those skilled in
the art upon review of the following detailed description of
preferred embodiments of the invention and accompanying drawings in
which like numerals represent like components.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is a perspective view of a gas burner bar in
accordance with embodiments of the invention.
[0011] FIG. 2 is a perspective view of the unassembled injector
assembly.
[0012] FIG. 3 is a perspective, exploded view of the unassembled
injector assembly portion of the gas burner bar.
[0013] FIG. 4 is a perspective, angled view of the assembled
injector assembly portion of the gas burner bar.
[0014] FIG. 5 is a perspective, side view of the assembled injector
assembly portion of the gas burner bar.
[0015] FIG. 6 is a perspective, alternative side view of the
assembled injector assembly portion of the gas burner bar.
DETAILED DESCRIPTION
[0016] The present invention now is described more fully
hereinafter with reference to the accompanying drawings, in which
embodiments of the invention are shown. This invention may,
however, be embodied in many different forms and should not be
construed as limited to the embodiments set forth herein; rather,
these embodiments are provided so that this disclosure will be
thorough and complete, and will fully convey the scope of the
invention to those skilled in the art.
[0017] Throughout this disclosure, the terms top, bottom, front,
back, left and right may be used. These terms are only intended to
provide relational orientation with respect to one another. For
example, any two opposed sides can be a right side and a left side
and by changing to an opposed viewpoint, right versus left will be
changed. Thus, top, bottom, front, back, left and right should not
be considered limiting and are used only to distinguish their
relationship to one another.
[0018] A major component of combustion systems is the mixer which
mixes fuel gas with combustion air and sends the mixture to the
burner at a fixed pressure. Important to the mixing process is the
location and alignment of the gas orifice in relation to both the
air intake and the Venturi tube. A misaligned or mislocated gas
orifice can result in several forms of burner malfunction such as
the creation of or increased amount of soot, flashback, and/or
flame lifting at the burner.
[0019] FIG. 1 illustrates a standard burner bar in a gas oven
utilizing the improved injector assembly of the present invention.
The gas burner bar (10) generally includes a burner region (20), a
Venturi tube (30), an air shutter (40), and an improved injector
assembly (50). While the burner bar is depicted as having an L-bend
region (60), alternative embodiments allow for a burner bar without
a band (e.g., straight). Generally, fuel gas is injected into the
burner bar via the injector assembly; combustion air is drawn into
the burner bar at the air shutter due to reduced pressure at the
Venturi tube, allowing the combustion air to begin mixing with the
fuel gas; the combustion air and fuel gas mixture is drawn into and
through the Venturi tube and is taken to the burner region where
combustion occurs at a plurality of combustion points.
[0020] FIG. 2 illustrates a perspective view of the injector
assembly in accordance with embodiments of the invention in an
unassembled state, and FIG. 3 illustrates an exploded, close-up
view of the unassembled improved injector assembly in conjunction
with the air shutter and Venturi tube. The injector assembly (50)
is assembled out of two components: an injector fitting (70) and an
injector (80). The injector fitting has two attachment points (71
& 72). The first attachment point (71) is positioned distal to
the air shutter (40) and is generally connected to a gas line (not
shown) which provides a fuel gas to the burner bar (10). To
facilitate the connection to the gas line, the first attachment has
male threads, although alternative methods of connection can be
utilized.
[0021] The second attachment point (72) of the injector fitting is
positioned proximal to the air shutter and, in contrast to the
first attachment point, has female threads. This is an improvement
over previous solutions for injector fittings, which will be
illustrated shortly.
[0022] The injector (80) has an orifice (81) through which gas
passes through the injector into the air shutter (40) and the
Venturi tube (30). In a preferred embodiment, the injector has a
hexagonal head for ease of assembly, but alternative shapes can be
utilized (e.g., square). This gas flow is controlled by a regulator
(not shown) connected to the gas line, the gas line being connected
to the first attachment point of the injector fitting. The injector
has male threads that are inserted into the female threads of the
second attachment point of the injector fitting.
[0023] Sandwiched between the injector and the injector fitting is
a portion of the air shutter. As illustrated in FIG. 3, the air
shutter has a threadless, raised opening (41) through which the
injector (80) passes through. After passing through the opening,
the injector is then threaded into the second attachment point of
the injector fitting. As a result, when engaged the injector and
the injector fitting secure the air shutter in a sandwich manner.
Furthermore, this arrangement also serves to hold the injector
fitting and injector in proper alignment. In alternative
embodiments there is no raised section of the opening (41) in the
air shutter.
[0024] FIGS. 4, 5 and 6 illustrate close-up, perspective views of
the assembled injector assembly and air shutter. As shown in FIGS.
4 and 5, when the injector (80) is secured to the injector fitting
(70) the head of the injector is held flush against the air shutter
(40). As shown in FIG. 4, when secured according to the preferred
embodiment of this invention, the head of the injector is properly
positioned in the mixing face, labeled as dimension "A." This
proper positioning results in a proper air fuel mixture entering
the Venturi tube (30). Additionally, by securing the injector to
the air shutter by sandwiching the air shutter between the injector
and the injector fitting, this proper positioning of the injector
is repeatable during assembly of the gas burner bar (10). Notably,
by securing the injector internally, the proper direction is
established in an internal fashion rather than in an external
fashion.
[0025] As shown in FIG. 6, when secured according to the preferred
embodiment of this invention, the center line of the injector
fitting (70), the injector (80), and the Venturi tube (30) are
collinear (labeled as plane "B"), contributing to consistent gas
flow and mixing while reducing flashback, flame lifting, and soot
created as a result of misaligned injectors.
[0026] The present invention can be disposed in any gas cooking
appliance that utilizes a gas burner bar, in particular cooking
appliances with broil and/or bake functionality in an oven cavity
used for the heating of foodstuffs.
[0027] The present invention has been described herein in terms of
several preferred embodiments. However, modifications and additions
to these embodiments will become apparent to those of ordinary
skill in the art upon a reading of the foregoing description. It is
intended that all such modifications and additions comprise a part
of the present invention to the extent that they fall within the
scope of the several claims appended hereto.
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