U.S. patent application number 10/591084 was filed with the patent office on 2007-11-29 for gas heating device.
This patent application is currently assigned to BSH Bosch und Siemens Hausgerate GmbH. Invention is credited to Cesar Astiz Montoya, Francisco Javier Caballero Caballero, Vicente Angel Basterra Echeverria.
Application Number | 20070272227 10/591084 |
Document ID | / |
Family ID | 34917290 |
Filed Date | 2007-11-29 |
United States Patent
Application |
20070272227 |
Kind Code |
A1 |
Astiz Montoya; Cesar ; et
al. |
November 29, 2007 |
Gas Heating Device
Abstract
A gas heating device comprising a gas burner, a combustion
chamber for the flames of the gas burner and a convection air
conduit with an air inlet and an air outlet for evacuating a
convection air stream that has been heated in the gas heating
device. The aim of the invention is to enable the gas heating
device to be used for various purposes. To achieve this, the
combustion chamber of the gas burner and the convection air conduit
are connected to allow the passage of fluid. An exhaust gas stream
can thus mix with the convection air stream.
Inventors: |
Astiz Montoya; Cesar;
(Estella, ES) ; Echeverria; Vicente Angel Basterra;
(Estella, ES) ; Caballero; Francisco Javier
Caballero; (Ugar-Yerri, ES) |
Correspondence
Address: |
BSH HOME APPLIANCES CORPORATION;INTELLECTUAL PROPERTY DEPARTMENT
100 BOSCH BOULEVARD
NEW BERN
NC
28562
US
|
Assignee: |
BSH Bosch und Siemens Hausgerate
GmbH
Carl-Wery-Strasse 34
Munich
DE
81739
|
Family ID: |
34917290 |
Appl. No.: |
10/591084 |
Filed: |
March 4, 2005 |
PCT Filed: |
March 4, 2005 |
PCT NO: |
PCT/EP05/50977 |
371 Date: |
March 26, 2007 |
Current U.S.
Class: |
126/85R |
Current CPC
Class: |
F24C 3/042 20130101;
F24C 15/08 20130101; F24C 3/14 20130101 |
Class at
Publication: |
126/085.00R |
International
Class: |
F24C 3/00 20060101
F24C003/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 4, 2004 |
ES |
P200400621 |
Claims
1-26. (canceled)
27. A gas heating device comprising: a gas burner including a
combustion chamber for the flames of the gas burner; and a
convection air conduit including an air outlet evacuating a
convection air stream that has been heated in the gas heating
device, the combustion chamber of the gas burner being in
fluid-flow communication with the convection air conduit and mixing
an exhaust gas stream from the combustion chamber with the
convection air stream.
28. The gas heating device according to claim 27, wherein the gas
burner is located inside the convection air conduit.
29. The gas heating device according to claim 27, wherein the
convection air conduit includes a first air duct and a second air
duct.
30. The gas heating device according to claim 29, wherein the gas
burner faces the first air duct.
31. The gas heating device according to claim 29, wherein the
second air duct is located behind the gas burner.
32. The gas heating device according to claim 29, wherein a control
element is located in the second air duct.
33. The gas heating device according to claim 27, wherein at least
one swirling element is arranged in the air duct which adjusts a
residence time of secondary air in the area of the gas burner.
34. The gas heating device according to claim 33, wherein the
swirling element at least partially surrounds the gas burner in a
funnel shape.
35. The gas heating device according to claim 27, wherein the
convection air conduit is arranged substantially perpendicularly in
the gas heating device.
36. The gas heating device according to claim 27, wherein the gas
burner comprises a burner plate including a plurality of flame
outlet openings.
37. The gas heating device according to claim 27, wherein the
convection air conduit is at least partly defined by a
heat-resistant, radiation-transmitting element.
38. The gas heating device according to claim 37, wherein the
radiation-transmitting element is a disk formed from at least one
of glass and glass ceramic.
39. The gas heating device according to claim 37, wherein the
radiation-transmitting element is located in a direction of thermal
emission of the gas burner.
40. The gas heating device according to claim 27, wherein at least
one flow guiding element is provided in the convection air conduit
protecting heat-sensitive locations of the gas heating device from
the convection air stream.
41. The gas heating device according to claim 27, wherein the gas
heating device comprises an installation compartment for a gas
bottle.
42. The gas heating device according to claim 27, further
comprising rollers disposed on a bottom portion of the gas heating
device.
43. The gas heating device according to claim 27, wherein the gas
heating device comprises a housing provided with a hood-like front
housing portion.
44. The gas heating device according to claim 43, wherein the front
housing portion at least partly defines the convection air
conduit.
45. The gas heating device according to claim 43, wherein the air
outlet and air inlet are provided in the front housing portion.
46. The gas heating device according to claim 43, wherein a
window-like recess is provided in the front housing portion in the
direction of thermal radiation of the gas burner.
47. The gas heating device according to claim 46, wherein the
radiation window of the front housing portion is closed by means of
a radiation-transmitting disk.
48. The gas heating device according to claim 43, wherein at least
one of a flow element and a swirling element is arranged on the
front housing portion.
49. The gas heating device according to claim 27, wherein the
convection air conduit is embodied as a vertical shaft in the gas
heating device.
50. The gas heating device according to claim 49, further
comprising a dividing wall and the convection air conduit being
disposed between the dividing wall and the housing front
portion.
51. The gas heating device according to claim 27, wherein the air
outlet is at least partly provided on the gas heating device at the
top.
52. The gas heating device according to claim 27, wherein a flow
element is provided between the gas burner and the air outlet
protecting the gas burner from incoming water.
Description
[0001] The invention relates to a gas heating device comprising a
gas burner, a combustion chamber for the flames of the gas burner
and a convection air conduit provided with an air outlet for
evacuating a convection air stream that has been heated in the gas
heating device.
[0002] A generic gas heating device is known from GB 2 183 329 A.
The gas heating device comprises a gas burner provided with a
burner plate and a combustion chamber in which the gas burns. The
combustion chamber is located between the burner plate and a
heat-resistant, transparent glass pane. Exhaust gases produced in
the combustion chamber are guided through an exhaust gas pipe to an
exhaust gas connection. A convection air stream produced in the gas
heating device comes indirectly in contact with the exhaust gas
stream by means of a heat exchanger and is then released into the
room to be heated.
[0003] The object of the invention is to provide a gas heating
device which can be used for various application purposes.
[0004] The object of the invention is achieved by a gas heating
device having the features of claim 1. According to the
characterising part of claim 1, the combustion chamber of the gas
burner is in fluid-dynamic communication with the convection air
conduit for mixing an exhaust gas stream with the convection air
stream. According to the invention, a fixedly installed exhaust gas
connection for an additional exhaust gas pipe for evacuating
exhaust gas can thus be dispensed with. As a result, the gas
heating device can be embodied as suitable for mobile use. At the
same time, as a result of the direct mixing of the exhaust gas
stream with the convection air stream, a better heating efficiency
of the gas heating device can be achieved. An additional heat
exchanger connected between the exhaust gas pipe and the convection
air conduit can thus be dispensed with.
[0005] The mixing of the exhaust gas stream with the convection air
stream is important according to the invention. This takes place as
a result of the fluid-dynamic communication of the combustion
chamber with the convection air conduit. This means on the one hand
that the exhaust gas stream is already mixed with the convection
air stream inside the gas heating device. However, the subject
matter of claim 1 also includes mixing of the exhaust gas stream
with the convection air stream after this has left the gas heating
device.
[0006] In order that using the gas heating device in closed rooms
does not present any health risk, largely low-emission combustion
is to be ensured. Such low-emission combustion can be achieved by
providing at least one swirling element in the combustion chamber
to adjust the residence time of the secondary air in the area of
the gas burner. Combustion with a suitable oxygen content can thus
be carried out. The swirling element can preferably surround the
gas burner in a funnel shape. In this case, the swirling element
can be embodied simply in terms of production engineering as a
deep-drawn steel sheet. The funnel-shaped steel sheet at the same
time forms a combustion chamber for the flames of the gas
burner.
[0007] It is advantageous if the air supply duct and/or the air
outlet duct are arranged substantially perpendicularly in the gas
heating device whereby a chimney effect can be improved so that a
more efficient convection air stream can take place.
[0008] From the combustion technology viewpoint, it is favourable
if the gas burner is constructed with a burner plate, in particular
made of ceramic material, provided with a plurality of flame outlet
openings. As a result of the plurality of smaller flames, a very
large reaction area is obtained for an efficient air supply to the
flames. At the same time, the burner plate can serve as an infrared
emitter.
[0009] The combustion chamber or the convection air conduit can be
at least partly delimited by a heat-resistant glass or glass
ceramic plate for thermal radiation. The glass or glass ceramic
plate can advantageously be arranged in the direction of the
thermal radiation of the gas burner. As a result, the surroundings
of the gas heating device can be heated not only by means of the
convection air stream but also additionally by thermal radiation.
This is particularly important when using the gas heating device in
the open air since the convection stream can only be used to a
subordinate extent for heating in the open air. As a result, the
gas heating device can not only be used for effective heating
inside closed rooms but also in the open air.
[0010] Preferably at least one flow guiding element can be provided
in the convection air stream. As a result, the convection and/or
exhaust gas stream can be guided inside the gas heating device in
such a manner than heat-sensitive locations of the gas heating
device can be protected.
[0011] The gas heating device can preferably have an installation
area for a gas bottle. The gas heating device can thus also be used
in a mobile fashion. At the same time, the gas heating device is
independent of the gas supply network. The above effect is enhanced
by constructing the gas heating device with rollers at the
bottom.
[0012] From the production engineering viewpoint, it is preferable
if the gas heating device comprises a housing with a hood-shaped
front housing portion. The usable interior space of the appliance
housing can be enlarged appreciably by the hood-shaped front
housing portion. At the same time, the front housing portion can
additionally delimit the convection air conduit. In addition, air
outlet openings and/or air inlet openings can be provided in the
front housing portion to construct this as a multifunctional part.
In this case, it is particularly preferable to manufacture the
front housing portion as a deep-drawn part independently of the gas
heating device. In this case, a window-like recess can also be
provided simply from the production engineering viewpoint in the
front housing portion, serving as a radiation window for any
thermal radiation. In order to ensure that the gas heating device
can also be used under conditions when the gas heating device is
exposed to wind or rain, the window-like recess can be closed by
means of a disk which is transparent to radiation.
[0013] The convection air conduit can preferably be provided in the
manner of a shaft between a dividing wall inside the gas heating
device and the front housing portion. An air shaft having a large
cross-section which intensifies the chimney effect is thereby
produced simply from the production engineering viewpoint.
[0014] The convection air stream in the gas heating device is
further intensified if the air outlet is embodied at least in part
at the top of the housing or in the housing front portion. In this
case, it is preferable particularly for use outside enclosed spaces
if a flow element is provided between the gas burner and the air
outlet which serves as rain protection for the gas burner. The air
outlet can advantageously be formed from a plurality of small air
openings or air slits. On the one hand, sufficient removal of heat
from the gas heating device is achieved. On the other hand,
sufficiently good wind protection is achieved as a result of the
small flow cross-sections of the air openings or air slits.
[0015] An exemplary embodiment of the invention is described
hereinafter with reference to the appended figures. In the
figures:
[0016] FIG. 1 is a perspective front view of a gas heating device
according to the invention; and
[0017] FIG. 2 is a side sectional view of the gas heating device
along the plane I-I from FIG. 1.
[0018] FIG. 1 shows a gas heating device comprising a housing 1
which has a hood-like front housing portion 3. Rollers 5 are
mounted on the bottom of the housing. The front housing portion 3
is made of deep-drawn metal sheet and has a radiation window 7 at
the front. The radiation window 7 is protected from contact by
means of a grille 9. A burner plate 11 of a gas burner can be seen
through the radiation window. The burner plate 11 has a plurality
of small flame outlet openings 13 which are indicated in FIG. 2. A
deep-drawn lateral edge 15 of the hood-like housing front portion 3
is fixed to the housing 1. Air outlet openings in the form of two
rows of slits 17, 19 are formed in the upper area of the front
housing portion 3. The first row of slits 17 is arranged at the
front in an upper section of the housing portion 3 which is aligned
obliquely upwards. The second row of slits 19 is constructed in an
upper section of the peripheral lateral edge 15 of the housing
portion 3. This produces a convection air stream I obliquely
upwards (see FIG. 2). Control elements 21 are arranged on an upper
side of the housing 1 as shown in FIG. 1.
[0019] In the lateral sectional view as shown in FIG. 2, an
interior of the housing 1 is divided by means of a dividing wall 23
into an installation compartment 25 as well as a front air shaft
27. A gas bottle 29 together with its relevant gas fittings is
arranged in the installation compartment 25 and is connected to the
control elements 21 by means of a gas supply pipe 31. The front air
shaft 27 forms the convection air conduit. For this purpose, the
housing 1 has air inlet openings 33 for supplying a convection air
stream at the bottom which emerges from the gas heating device
through the two upper rows of slits 17, 19. Inside the air shaft 27
a gas burner 35 is mounted on a mounting plate 37 which is affixed
to an inner housing wall. The gas burner comprises a mixing chamber
39 which is closed by means of the burner plate 11. The mixing
chamber is connected to the gas pipe 31. A gas nozzle is connected
at a distance in front of the mixing chamber 39 so that the gas
stream entrains primary air into the mixing chamber 39.
[0020] On the flame outlet side of the gas burner 35, the gas
burner is surrounded by a funnel-shaped deep-drawn steel sheet 41.
The funnel-shaped steel sheet 41 forms a combustion chamber 42 for
the flames of the gas burner 35. In addition, the steel sheet 41
induces swirling of the convection air stream I in the area of the
flame outlet openings 13 of the gas burner. In this way a secondary
quantity of air can be adjusted in the combustion chamber 42 for
low-emission combustion of the gas. An electronic ignition device
43 is held in a lower area of the deep-drawn steel sheet 41.
[0021] The air shaft 27 in FIG. 2 is divided into a first air shaft
45 and a second air shaft 47. In the first air shaft 45, in
addition to the convection gas stream I, an exhaust gas stream A is
conveyed to the two rows of slits 17, 19 so that a comparatively
hot convection air stream is present in the first air shaft 45. The
second air shaft 47 is separated from the first air shaft 45 by
means of an air baffle 49 and is located behind the gas burner 35.
In the second air shaft 47 the temperature of the convection air
stream I is far lower than in the first air shaft 45. The
convection air stream I flowing in the second air shaft 47 is
therefore used for cooling the control elements 21 as shown in the
figure. Both the first air shaft 45 and the second air shaft 47 are
in fluid-dynamic communication with the two rows of slits 17,
19.
[0022] As shown in FIG. 2, the front radiation window 7 is closed
by means of a glass ceramic disk 51 which is transparent to
radiation. As a result, thermal radiation from the burner plate 11
can pass through the glass ceramic disk 51 from the gas heating
device. The gas heating device therefore heats not only by means of
the convection air stream but also by means of the thermal
radiation coming from the radiation window.
[0023] In order to put the gas heating device into operation, the
gas-air mixture emerging from the flame outlet openings 13 is first
ignited automatically. After successful ignition, a convection air
stream I is obtained through the air outlet openings 33 at the
bottom. The convection air stream I on the one hand supplies the
gas burner with primary air which flows together with the gas into
the mixing chamber 39. At the same time, the convection air stream
I supplies the flame carpet of the burner plate 11 with a secondary
air stream II. The exhaust gas stream A is automatically entrained
by the convection air stream I and conveyed through the rows of
slits 17, 19 from the gas heating device.
* * * * *