CA2594577A1 - Burner for a heating device with improved fuel supply improved heat shield and improved impact disc - Google Patents
Burner for a heating device with improved fuel supply improved heat shield and improved impact disc Download PDFInfo
- Publication number
- CA2594577A1 CA2594577A1 CA002594577A CA2594577A CA2594577A1 CA 2594577 A1 CA2594577 A1 CA 2594577A1 CA 002594577 A CA002594577 A CA 002594577A CA 2594577 A CA2594577 A CA 2594577A CA 2594577 A1 CA2594577 A1 CA 2594577A1
- Authority
- CA
- Canada
- Prior art keywords
- burner
- fuel
- heat shield
- combustion chamber
- baffle plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 59
- 238000010438 heat treatment Methods 0.000 title abstract description 4
- 238000002485 combustion reaction Methods 0.000 claims abstract description 56
- 238000000889 atomisation Methods 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 description 7
- 230000002411 adverse Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/40—Mixing tubes or chambers; Burner heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D9/00—Burners in which a stream of liquid fuel impinges intermittently on a hot surface
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/24—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/40—Mixing tubes or chambers; Burner heads
- F23D11/406—Flame stabilising means, e.g. flame holders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/40—Mixing tubes or chambers; Burner heads
- F23D11/408—Flow influencing devices in the air tube
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/11401—Flame intercepting baffles forming part of burner head
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Spray-Type Burners (AREA)
- Air-Conditioning For Vehicles (AREA)
- Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
Abstract
The invention relates to a burner for a heating device, in particular, for application in motor vehicles, comprising an essentially axially-symmetrical combustion chamber (22), a burner nozzle (12), for the introduction and atomisation of fuel, with a fuel lance (14), for the introduction of fuel into the combustion chamber (22) and a combustion air inlet (16), for the introduction of combustion air into the combustion chamber, a starting zone (18), in which an ignition of the fuel to start the burner (10) occurs, a heat shield (24), between the burner nozzle (12) and the combustion chamber (22), whereby the heat shield comprises openings (28, 30) for the introduction of secondary air into the combustion chamber and an impact disc (36), arranged in the combustion chamber. According to the invention, the exit speed of the fuel is determined by the selection of the inner diameter of the fuel lance (14), such that during a starting phase for the burner (10), fuel reaches the starting zone (18) in essentially non-atomised form, the openings are provided with air guide elements (28, 30) and the impact disc (36) has a given dome in the axial direction.
Description
BURNER FOR A HEATING DEVICE WITH IMPROVED FUEL SUPPLY
IMPROVED HEAT SHIELD AND IMPROVED IMPACT DISC
The invention relates to a burner for a heater, especially for use in motor vehicles, with an essentially axially symmetrical combustion chamber, a burner nozzle for supply and atomization of fuel, which has a fuel needle for supplying fuel to the combustion chamber and a combustion air supply for supplying combustion air to the combustion chamber, a starting zone in which ignition of the fuel to start the burner takes place, a heat shield between the burner nozzle and the combustion chamber, the heat shield having openings for supplying secondary air to the combustion chamber, and a baffle plate which is located in the combustion chamber.
These burners which are also called atomization burners or spray burners are used especially in auxiliary heaters and independent heaters for motor vehicles.
There are numerous requirements for these burners, especially with respect to reliable and largely emission-free starting behavior and stable combustion operation.
Furthermore an effort is made to build heaters which can be used in different installation positions.
With respect to starting behavior, various operating parameters must be matched to one another. On the one hand, it is necessary during burner start to make available a relatively rich fuel-air mixture in the starting zone, on the other hand however making available a sufficient amount of primary combustion air is necessary to ensure transport of fuel from the fuel needle to the starting zone.
The requirement of allowing different installation positions of the heater is associated with problems relating to starting behavior. Specifically, to be able to transport fuel into the starting zone with low primary air supply, in the past orienting the fuel needle with the outlet opening pointed down had to be tolerated; this resulted in the entire burner having to be mounted in the vertical installation position.
IMPROVED HEAT SHIELD AND IMPROVED IMPACT DISC
The invention relates to a burner for a heater, especially for use in motor vehicles, with an essentially axially symmetrical combustion chamber, a burner nozzle for supply and atomization of fuel, which has a fuel needle for supplying fuel to the combustion chamber and a combustion air supply for supplying combustion air to the combustion chamber, a starting zone in which ignition of the fuel to start the burner takes place, a heat shield between the burner nozzle and the combustion chamber, the heat shield having openings for supplying secondary air to the combustion chamber, and a baffle plate which is located in the combustion chamber.
These burners which are also called atomization burners or spray burners are used especially in auxiliary heaters and independent heaters for motor vehicles.
There are numerous requirements for these burners, especially with respect to reliable and largely emission-free starting behavior and stable combustion operation.
Furthermore an effort is made to build heaters which can be used in different installation positions.
With respect to starting behavior, various operating parameters must be matched to one another. On the one hand, it is necessary during burner start to make available a relatively rich fuel-air mixture in the starting zone, on the other hand however making available a sufficient amount of primary combustion air is necessary to ensure transport of fuel from the fuel needle to the starting zone.
The requirement of allowing different installation positions of the heater is associated with problems relating to starting behavior. Specifically, to be able to transport fuel into the starting zone with low primary air supply, in the past orienting the fuel needle with the outlet opening pointed down had to be tolerated; this resulted in the entire burner having to be mounted in the vertical installation position.
To ensure stable combustion operation of the burner, likewise mutually contradictory requirements must be satisfied. On the one hand, good intermixing of the fuel and air is always required, on the other hand in the core region of the flame and there especially during the starting phase it is undesirable to cause overly high air proportions and overly high swirling.
The object of the invention is to overcome the described problems of the prior art at least in part and especially to enable reliable and low-emission starting behavior with little dense smoke in different installation positions.
This object is achieved with the features of the independent claim.
Advantageous developments of the invention are given in the dependent claims.
The invention is based on a generic burner in that by choosing the inside diameter of the fuel needle the exit speed of the fuel is predetermined such that during the starting phase of the burner fuel in essentially unatomized form reaches the starting zone, that the openings are equipped with air guide elements, and that the baffle plate has a defmed curvature into the axial direction. By reducing the inside diameter of the fuel needle compared to fuel needles in the heaters of the prior art, at the same fuel delivery volume the exit speed of the fuel is increased.
In this way for any installation position it is possible for the fuel jet to reach the starting zone from the exit opening of the fuel needle. In particular, for a small primary air amount, for which the supplied primary air should have only little angular momentum, an essentially unatomized fuel jet can reach the starting zone. Consequently the burner starts reliably and formation of dense smoke during starting is distinctly reduced. A heat shield is fundamentally useful to shield the nozzle and the fuel supply against the heat energy present in the combustion chamber.
Furthermore, secondary air is supplied to the combustion space via the heat shield. By the openings for secondary air supply being provided with air guide elements, this secondary air can be supplied in a controlled manner so that combustion operation, both with respect to starting operation and also for continuous operation, can be influenced in a specific manner. For the baffle plates of the prior art which are made flat, this is among others not the case since depending on the temperature spontaneous changes of shape can occur which can adversely affect the combustion behavior of the burner.
It is preferred that the inside diameter of the fuel needle be between 0.5 and 0.7 mm.
Compared to exit speeds for fuel needles of the prior art in which the inside diameter is in the region of 0.8 mm, the exit speed for inside diameters between 0.5 and 0.7 mm can be almost doubled or even more than doubled.
It is especially preferred that the inside diameter of the fuel needle is roughly 0.6 mm. At this inside diameter, in full load operation, i.e. at a fuel mass flow of 0.5 kg/h exit speeds of more than 0.6 m/s are possible, while for an inside diameter of 0.8 mm the exit speed is in the region of 0.35 m/s. The exit speed in partial load operation rises accordingly, i.e. for a fuel mass flow of 0.2 kg/h, from roughly 0.14 m/s to roughly 0.25 m/s. For a corresponding choice of construction properties or of operating parameters the goal of an essentially unatomized jet which reaches the starting zone when the heater is being started can be achieved even with a conventional fuel needle with an inside diameter of roughly 0.8 mm.
It is useful for the starting zone to be made as a starting chamber into which an ignition element projects. The wall of the combustion chamber can surround the ignition element in this way. During starting operation the "ballistic" fuel jet can then wet the ignition element and the combustion chamber wall with fuel so that the combustion chamber wall and adjacent components after their heating are used as wall vaporizers.
It is useful for the air guide elements to be formed by tabs which are made integrally with the heat shield and which project in the direction of the combustion chamber. This heat shield can be easily produced, for example by the tabs being formed with a V-shaped punching tool and being bent out of the plane of the heat shield after or with the punching process.
The invention is also usefully developed in that the tabs are made at different angles to the surface of the heat shield and/or to the radius of the heat shield. If the clips extend almost perpendicularly to the radius of the heat shield, this delivers strong angular momentum, while tabs with a smaller angle to the radius deliver smaller angular momentum. Tabs which assume a small angle to the surface of the heat shield produce air flows which have a large radial component and a small axial component, while for tabs with large angles to the surface of the heat shield the axial component dominates. In this way it is possible to route secondary air with low angular momentum into the core region of flame formation. In this way on the one hand the air required for combustion is supplied; but there is no excess angular momentum which would adversely affect stabilization of the flame. In particular the secondary air can be divided depending on the alignment of the individual air guide elements.
The object of the invention is to overcome the described problems of the prior art at least in part and especially to enable reliable and low-emission starting behavior with little dense smoke in different installation positions.
This object is achieved with the features of the independent claim.
Advantageous developments of the invention are given in the dependent claims.
The invention is based on a generic burner in that by choosing the inside diameter of the fuel needle the exit speed of the fuel is predetermined such that during the starting phase of the burner fuel in essentially unatomized form reaches the starting zone, that the openings are equipped with air guide elements, and that the baffle plate has a defmed curvature into the axial direction. By reducing the inside diameter of the fuel needle compared to fuel needles in the heaters of the prior art, at the same fuel delivery volume the exit speed of the fuel is increased.
In this way for any installation position it is possible for the fuel jet to reach the starting zone from the exit opening of the fuel needle. In particular, for a small primary air amount, for which the supplied primary air should have only little angular momentum, an essentially unatomized fuel jet can reach the starting zone. Consequently the burner starts reliably and formation of dense smoke during starting is distinctly reduced. A heat shield is fundamentally useful to shield the nozzle and the fuel supply against the heat energy present in the combustion chamber.
Furthermore, secondary air is supplied to the combustion space via the heat shield. By the openings for secondary air supply being provided with air guide elements, this secondary air can be supplied in a controlled manner so that combustion operation, both with respect to starting operation and also for continuous operation, can be influenced in a specific manner. For the baffle plates of the prior art which are made flat, this is among others not the case since depending on the temperature spontaneous changes of shape can occur which can adversely affect the combustion behavior of the burner.
It is preferred that the inside diameter of the fuel needle be between 0.5 and 0.7 mm.
Compared to exit speeds for fuel needles of the prior art in which the inside diameter is in the region of 0.8 mm, the exit speed for inside diameters between 0.5 and 0.7 mm can be almost doubled or even more than doubled.
It is especially preferred that the inside diameter of the fuel needle is roughly 0.6 mm. At this inside diameter, in full load operation, i.e. at a fuel mass flow of 0.5 kg/h exit speeds of more than 0.6 m/s are possible, while for an inside diameter of 0.8 mm the exit speed is in the region of 0.35 m/s. The exit speed in partial load operation rises accordingly, i.e. for a fuel mass flow of 0.2 kg/h, from roughly 0.14 m/s to roughly 0.25 m/s. For a corresponding choice of construction properties or of operating parameters the goal of an essentially unatomized jet which reaches the starting zone when the heater is being started can be achieved even with a conventional fuel needle with an inside diameter of roughly 0.8 mm.
It is useful for the starting zone to be made as a starting chamber into which an ignition element projects. The wall of the combustion chamber can surround the ignition element in this way. During starting operation the "ballistic" fuel jet can then wet the ignition element and the combustion chamber wall with fuel so that the combustion chamber wall and adjacent components after their heating are used as wall vaporizers.
It is useful for the air guide elements to be formed by tabs which are made integrally with the heat shield and which project in the direction of the combustion chamber. This heat shield can be easily produced, for example by the tabs being formed with a V-shaped punching tool and being bent out of the plane of the heat shield after or with the punching process.
The invention is also usefully developed in that the tabs are made at different angles to the surface of the heat shield and/or to the radius of the heat shield. If the clips extend almost perpendicularly to the radius of the heat shield, this delivers strong angular momentum, while tabs with a smaller angle to the radius deliver smaller angular momentum. Tabs which assume a small angle to the surface of the heat shield produce air flows which have a large radial component and a small axial component, while for tabs with large angles to the surface of the heat shield the axial component dominates. In this way it is possible to route secondary air with low angular momentum into the core region of flame formation. In this way on the one hand the air required for combustion is supplied; but there is no excess angular momentum which would adversely affect stabilization of the flame. In particular the secondary air can be divided depending on the alignment of the individual air guide elements.
According to another embodiment it is provided that the clips are grouped at essentially identical angles to the surface of the heat shield and/or to the radius of the heat shield. Defmed flow states in the combustion chamber are formed by the collective alignment of the tabs.
The invention is furthermore usefully executed such that the burner has a burnout zone and that the secondary air which is supplied to the burnout zone has higher angular momentum than the secondary air which is supplied to the starting zone. High angular momentum is desired in the burnout zone. In particular a radially inside swirled backflow region improves the burnout and provides for the combustion chamber volume being effectively used.
It is preferred that there is a curvature in the direction of the burnout zone. In this way a sufficient space in the region of the starting chamber is made available.
Furthermore it has been found that the curvature in the direction of the burnout zone does not have an adverse effect on the flow behavior in this zone. In particular the pronounced swirled backflow region is maintained in the radially inside region of the burnout zone.
According to one preferred embodiment of the invention it is provided that the outer periphery of the baffle plate defines a plane and that the ratio between the maximum axial distance of the baffle plate from this plane and the diameter of the baffle plate is between 0.07 and 0.21. The most heavily arched point of the baffle plate is preferably essentially in the center of the arrangement with respect to the radial coordinate. From the plane which is defmed by the outer periphery of the baffle plate, this point has an axial distance which is defined by the indicated ratio to the diameter.
In this connection it is especially preferred that the ratio between the maximum axial distance of the baffle plate from the plane and the diameter of the baffle plate is roughly 0.14.
For example the round diameter of baffle plate is roughly 40 mm, while the curvature has a value of roughly 5.7 mm.
The invention is based on the fmding that the novel fuel supply with a fuel needle with a reduced exit cross section, the novel heat shield with air guide elements and the novel, curved baffle plate can greatly improve the operating behavior of a burner. This relates especially to the starting behavior, the stability of burner operation and possibilities with respect to the installation position of the burner in the motor vehicle.
The invention is explained by way of example with reference to the accompanying drawings using preferred embodiments.
The invention is furthermore usefully executed such that the burner has a burnout zone and that the secondary air which is supplied to the burnout zone has higher angular momentum than the secondary air which is supplied to the starting zone. High angular momentum is desired in the burnout zone. In particular a radially inside swirled backflow region improves the burnout and provides for the combustion chamber volume being effectively used.
It is preferred that there is a curvature in the direction of the burnout zone. In this way a sufficient space in the region of the starting chamber is made available.
Furthermore it has been found that the curvature in the direction of the burnout zone does not have an adverse effect on the flow behavior in this zone. In particular the pronounced swirled backflow region is maintained in the radially inside region of the burnout zone.
According to one preferred embodiment of the invention it is provided that the outer periphery of the baffle plate defines a plane and that the ratio between the maximum axial distance of the baffle plate from this plane and the diameter of the baffle plate is between 0.07 and 0.21. The most heavily arched point of the baffle plate is preferably essentially in the center of the arrangement with respect to the radial coordinate. From the plane which is defmed by the outer periphery of the baffle plate, this point has an axial distance which is defined by the indicated ratio to the diameter.
In this connection it is especially preferred that the ratio between the maximum axial distance of the baffle plate from the plane and the diameter of the baffle plate is roughly 0.14.
For example the round diameter of baffle plate is roughly 40 mm, while the curvature has a value of roughly 5.7 mm.
The invention is based on the fmding that the novel fuel supply with a fuel needle with a reduced exit cross section, the novel heat shield with air guide elements and the novel, curved baffle plate can greatly improve the operating behavior of a burner. This relates especially to the starting behavior, the stability of burner operation and possibilities with respect to the installation position of the burner in the motor vehicle.
The invention is explained by way of example with reference to the accompanying drawings using preferred embodiments.
Figure 1 shows a sectional view of the burner as claimed in the invention;
Figure 2 shows a perspective of a burner flange with the heat shield inserted therein; and Figure 3 shows a perspective of the heat shield.
In the following description of preferred embodiments of the invention the same reference numbers label the same or comparable components.
Figure 1 shows a sectional view of the burner as claimed in the invention. The burner 10 as claimed in the invention has a nozzle 12 which is securely joined to the heat shield 24. The heat shield 24 together with a burner pipe 40 which is connected to the heat shield 24 defines a combustion chamber 22. The combustion chamber pipe 40 is surrounded by an outer pipe 42 which forms the burner flange. A flame tube 38 is attached to this outer pipe 42. The connections between the heat shield 24 and the combustion chamber pipe 40 or between the combustion chamber pipe 40, the outer pipe 42 and the flame tube 38 are generally welded connections. On the fuel nozzle 12 there is the fuel supply 50 which has a metal pipe 52 for supply of fuel and a fuel needle 14 for injection of fuel into the combustion chamber 22.
Furthermore, in the region of the fuel nozzle 16 there are channels for supply of primary combustion air into the fuel nozzle 20 which flows past the fuel needle 14 in order to then flow along the radially widening air guide of the fuel nozzle 12 in the direction of the combustion chamber and finally into the combustion chamber 22. The radial widening of the air guide achieves improves atomization due to the Venturi effect. Within the combustion chamber 22 there is furthermore a baffle plate 36 which has an advantageous curvature.
This curvature in the direction of the burnout zone 32 is advantageous since in this way heat-induced spontaneous changes in the shape of the baffle plate 36 are prevented. By curving the baffle plate 36 in the direction of the burnout zone 32 moreover a sufficient space is available for accommodating the starting chamber 18. The wall which defines the starting chamber 18 is welded to the baffle plate 36.
Figure 2 shows a perspective of a burner flange with the heat shield inserted into it, and Figure 3 shows a perspective of a heat shield. Furthermore, reference is likewise made below to burner components as shown in Figure 1. The heat shield 24 has a central opening 48 through which the fuel-air mixture which has been delivered from the nozzle 12 enters the combustion chamber. Furthermore, there is a laterally arranged opening 34 for routing the ignition element 20 through. On the heat shield 24 there are furthermore attachment pins 44, 46 to which the nozzle 12 is attached. The heat shield 24 furthermore has a host of openings 26 through which secondary air can enter the combustion chamber 22. On the side of the heat shield 24 facing the combustion chamber 22 there are triangular air guide elements 28, 30. They cause division of the secondary air based on the different angles to the radius of the heat shield 24. A first group of air guide elements with members partially labelled with reference number 28 are aligned at a large angle to the radius of the heat shield 24, i.e. their alignment is essentially or almost tangential. Based on this alignment the secondary air passing through the corresponding openings 26, with an exit flow direction indicated by the arrow, will overflow into the burnout zone 32 past the baffle plate 36 with high angular momentum.
This air which is provided with a high angular momentum flows in the radially outlying region of the burnout zone 32 into the posterior region of the combustion chamber 32, i.e. into the region of the combustion chamber 22 which faces away from the heat shield 24, and then with high swirling in the central region back in the direction of the baffle plate 36. Consequently advantageous mixing of the gaseous components in the burnout zone 32 occurs.
Another group of air guide elements 30 in its alignment has a smaller angle to the radius of the heat shield 24.
These air guide elements are partially identified with the reference number 30. Moreover these air guide elements 30 have a smaller angle to the surface of the heat shield 24 than the air guide elements 28. Consequently these air guide elements 30 route the secondary air with an exit flow direction indicated by another arrow with low angular momentum into the core region of the flame; this especially benefits stable combustion chamber behavior.
Thus a novel spray burner is made available which is improved with respect to the possible installation positions, the starting behavior and the behavior in continuous operation.
Furthermore problems with respect to the temperature-induced changes of the shape of the baffle plate are avoided.
The features of the invention disclosed in the above specification, the drawings and the claims can be important to the implementation of the invention both individually and also in any combination.
Figure 2 shows a perspective of a burner flange with the heat shield inserted therein; and Figure 3 shows a perspective of the heat shield.
In the following description of preferred embodiments of the invention the same reference numbers label the same or comparable components.
Figure 1 shows a sectional view of the burner as claimed in the invention. The burner 10 as claimed in the invention has a nozzle 12 which is securely joined to the heat shield 24. The heat shield 24 together with a burner pipe 40 which is connected to the heat shield 24 defines a combustion chamber 22. The combustion chamber pipe 40 is surrounded by an outer pipe 42 which forms the burner flange. A flame tube 38 is attached to this outer pipe 42. The connections between the heat shield 24 and the combustion chamber pipe 40 or between the combustion chamber pipe 40, the outer pipe 42 and the flame tube 38 are generally welded connections. On the fuel nozzle 12 there is the fuel supply 50 which has a metal pipe 52 for supply of fuel and a fuel needle 14 for injection of fuel into the combustion chamber 22.
Furthermore, in the region of the fuel nozzle 16 there are channels for supply of primary combustion air into the fuel nozzle 20 which flows past the fuel needle 14 in order to then flow along the radially widening air guide of the fuel nozzle 12 in the direction of the combustion chamber and finally into the combustion chamber 22. The radial widening of the air guide achieves improves atomization due to the Venturi effect. Within the combustion chamber 22 there is furthermore a baffle plate 36 which has an advantageous curvature.
This curvature in the direction of the burnout zone 32 is advantageous since in this way heat-induced spontaneous changes in the shape of the baffle plate 36 are prevented. By curving the baffle plate 36 in the direction of the burnout zone 32 moreover a sufficient space is available for accommodating the starting chamber 18. The wall which defines the starting chamber 18 is welded to the baffle plate 36.
Figure 2 shows a perspective of a burner flange with the heat shield inserted into it, and Figure 3 shows a perspective of a heat shield. Furthermore, reference is likewise made below to burner components as shown in Figure 1. The heat shield 24 has a central opening 48 through which the fuel-air mixture which has been delivered from the nozzle 12 enters the combustion chamber. Furthermore, there is a laterally arranged opening 34 for routing the ignition element 20 through. On the heat shield 24 there are furthermore attachment pins 44, 46 to which the nozzle 12 is attached. The heat shield 24 furthermore has a host of openings 26 through which secondary air can enter the combustion chamber 22. On the side of the heat shield 24 facing the combustion chamber 22 there are triangular air guide elements 28, 30. They cause division of the secondary air based on the different angles to the radius of the heat shield 24. A first group of air guide elements with members partially labelled with reference number 28 are aligned at a large angle to the radius of the heat shield 24, i.e. their alignment is essentially or almost tangential. Based on this alignment the secondary air passing through the corresponding openings 26, with an exit flow direction indicated by the arrow, will overflow into the burnout zone 32 past the baffle plate 36 with high angular momentum.
This air which is provided with a high angular momentum flows in the radially outlying region of the burnout zone 32 into the posterior region of the combustion chamber 32, i.e. into the region of the combustion chamber 22 which faces away from the heat shield 24, and then with high swirling in the central region back in the direction of the baffle plate 36. Consequently advantageous mixing of the gaseous components in the burnout zone 32 occurs.
Another group of air guide elements 30 in its alignment has a smaller angle to the radius of the heat shield 24.
These air guide elements are partially identified with the reference number 30. Moreover these air guide elements 30 have a smaller angle to the surface of the heat shield 24 than the air guide elements 28. Consequently these air guide elements 30 route the secondary air with an exit flow direction indicated by another arrow with low angular momentum into the core region of the flame; this especially benefits stable combustion chamber behavior.
Thus a novel spray burner is made available which is improved with respect to the possible installation positions, the starting behavior and the behavior in continuous operation.
Furthermore problems with respect to the temperature-induced changes of the shape of the baffle plate are avoided.
The features of the invention disclosed in the above specification, the drawings and the claims can be important to the implementation of the invention both individually and also in any combination.
R f .r .nc . numb r lict burner 12 burner nozzle 14 fuel needle 16 combustion air supply 18 starting zone ignition element 22 combustion chamber 24 heat shield 26 opening 28 air guide element air guide element 32 burnoutzone 34 opening 36 baffle plate 38 flame tube burnerpipe 42 outer pipe 44 attachment pin 46 attachment pin 48 opening fuel supply 52 metal pipe
Claims (12)
1. Burner for a heater, especially for use in motor vehicles, with - an essentially axially symmetrical combustion chamber (22), - a burner nozzle (12) for supply and atomization of fuel, which has a fuel needle (14) for supplying fuel to the combustion chamber (22) and a combustion air supply (16) for supplying combustion air to the combustion chamber, - a starting zone (18) in which ignition of the fuel to start the burner takes place, - a heat shield between the burner nozzle and the combustion chamber, the heat shield having openings for supplying secondary air to the combustion chamber, and - a baffle plate which is located in the combustion chamber, characterized in that - by choosing the inside diameter of the fuel needle (14) the exit speed of the fuel is predetermined such that during the starting phase of the burner (10) fuel in essentially unatomized form reaches the starting zone (18), - that the openings are equipped with air guide elements, and - that the baffle plate has a defined curvature into the axial direction.
2. Burner as claimed in claim 1, wherein the inside diameter of the fuel needle (14) is between 0.5 and 0.7 mm.
3. Burner as claimed in claim 1 or 2, wherein the inside diameter of the fuel needle (12) is roughly 0.6 mm.
4. Burner as claimed in one of the preceding claims, wherein the starting zone is made as a starting chamber (18) into which an ignition element (20) projects.
5. Burner as claimed in one of the preceding claims, wherein the air guide elements are formed by tabs (28, 30) which are made integrally with the heat shield and which project in the direction of the combustion chamber.
6. Burner as claimed in claim 5, wherein the clips (28, 30) are made at different angles to the surface of the heat shield and/or to the radius of the heat shield (24).
7. Burner as claimed in claim 5 or 6, wherein the clips (28, 30) are grouped at essentially identical angles to the surface of the heat shield (24) and/or to the radius of the heat shield.
8. Burner as claimed in one of the preceding claims, wherein the - burner (10) has a burnout zone (32) and - wherein the secondary air which is supplied to the burnout zone has higher angular momentum than the secondary air which is supplied to the starting zone.
9. Burner as claimed in one of the preceding claims, wherein the heat shield (24) has an opening (34) for routing the ignition element through.
10. Burner as claimed in one of the preceding claims, wherein there is a curvature of the baffle plate (36) in the direction of the burnout zone (30).
11. Burner as claimed in one of the preceding claims, wherein - the outer periphery of the baffle plate defines a plane and - wherein the ratio between the maximum axial distance of the baffle plate from this plane and the diameter of the baffle plate is between 0.07 and 0.21.
12. Burner as claimed in claim 11, wherein the ratio between the maximum axial distance of the baffle plate (36) from the plane and the diameter of the baffle plate (36) is roughly 0.14.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004055438.2 | 2004-11-17 | ||
| DE102004055438 | 2004-11-17 | ||
| PCT/DE2005/002061 WO2006053542A1 (en) | 2004-11-17 | 2005-11-16 | Burner for a heating device with improved fuel supply improved heat shield and improved impact disc |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2594577A1 true CA2594577A1 (en) | 2006-05-26 |
Family
ID=35994656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002594577A Abandoned CA2594577A1 (en) | 2004-11-17 | 2005-11-16 | Burner for a heating device with improved fuel supply improved heat shield and improved impact disc |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20090220901A1 (en) |
| EP (1) | EP1812748A1 (en) |
| JP (1) | JP2008520950A (en) |
| KR (1) | KR20070086040A (en) |
| CN (1) | CN101080595A (en) |
| CA (1) | CA2594577A1 (en) |
| DE (1) | DE112005003411A5 (en) |
| RU (1) | RU2007122503A (en) |
| WO (1) | WO2006053542A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2601319A1 (en) * | 2004-11-17 | 2006-05-26 | Webasto Ag | Burner for a heating device with improved fuel supply |
| DE102006048985A1 (en) * | 2006-10-17 | 2008-04-24 | Webasto Ag | Method for starting a heater for a motor vehicle |
| FR2925657B1 (en) * | 2007-12-19 | 2010-01-29 | Mer Joseph Le | DEVICE AND METHOD FOR STABILIZING THE PRESSURE AND FLOW OF A GAS MIXTURE SUPPLYING A SURFACE COMBUSTION CYLINDRICAL BURNER |
| CN103688110B (en) * | 2011-04-19 | 2016-10-05 | 北海道特殊饲料株式会社 | Burner and combustion method, the TRT employing them and electricity-generating method |
| US10767900B2 (en) | 2015-05-14 | 2020-09-08 | Lochinvar, Llc | Burner with flow distribution member |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2544299A (en) * | 1951-03-06 | Liquid fuel burner with mixing and igniting means | ||
| US3081948A (en) * | 1960-12-01 | 1963-03-19 | Exxon Research Engineering Co | Oil burner system |
| US3694135A (en) * | 1970-07-20 | 1972-09-26 | Texaco Inc | Flame retention burner head |
| US4561841A (en) * | 1980-11-21 | 1985-12-31 | Donald Korenyi | Combustion apparatus |
| GB2106632B (en) * | 1981-09-11 | 1985-06-12 | Secr Defence | Fuel and gas mixing |
| SE454460B (en) * | 1983-06-14 | 1988-05-02 | Sandstroem Christer | BURNER FOR OIL, GAS, CARBON PUSHING SUSPENSION AND FUEL |
| GB2143938B (en) * | 1983-07-23 | 1986-08-13 | Rolls Royce | Fuel burner for a gas turbine engine |
| DE4323300C2 (en) * | 1993-07-12 | 1998-03-19 | Oertli Waermetechnik Ag | Mixing device for a burner |
| US5911363A (en) * | 1997-03-10 | 1999-06-15 | Spratronics, Inc. | Vehicle mounted spray apparatus and method |
| DE10019198A1 (en) * | 2000-04-17 | 2001-10-18 | Webasto Thermosysteme Gmbh | Atomizing burner especially for stand-alone heater in motor vehicle has impingement plate located inside combustion chamber in fuel atomizing direction and in flame zone, and provided with collar to form approximate shape of cup |
-
2005
- 2005-11-16 WO PCT/DE2005/002061 patent/WO2006053542A1/en active Application Filing
- 2005-11-16 DE DE112005003411T patent/DE112005003411A5/en not_active Withdrawn
- 2005-11-16 CA CA002594577A patent/CA2594577A1/en not_active Abandoned
- 2005-11-16 KR KR1020077013152A patent/KR20070086040A/en not_active Application Discontinuation
- 2005-11-16 JP JP2007541671A patent/JP2008520950A/en not_active Withdrawn
- 2005-11-16 CN CNA2005800433261A patent/CN101080595A/en active Pending
- 2005-11-16 EP EP05806922A patent/EP1812748A1/en not_active Withdrawn
- 2005-11-16 US US11/719,572 patent/US20090220901A1/en not_active Abandoned
- 2005-11-16 RU RU2007122503/06A patent/RU2007122503A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| DE112005003411A5 (en) | 2007-10-25 |
| RU2007122503A (en) | 2008-12-27 |
| US20090220901A1 (en) | 2009-09-03 |
| JP2008520950A (en) | 2008-06-19 |
| WO2006053542A1 (en) | 2006-05-26 |
| KR20070086040A (en) | 2007-08-27 |
| CN101080595A (en) | 2007-11-28 |
| EP1812748A1 (en) | 2007-08-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6644959B2 (en) | Atomizing burner for a heating device of a vehicle | |
| CA1136435A (en) | Lean prechamber outflow combustor with sets of primary air entrance | |
| CA2594577A1 (en) | Burner for a heating device with improved fuel supply improved heat shield and improved impact disc | |
| US6705855B2 (en) | Low-NOx burner and combustion method of low-NOx burner | |
| CA2595021A1 (en) | Burner for a heater device with improved impact disc | |
| US6050809A (en) | Immersion tube burner with improved flame stability | |
| US20090220903A1 (en) | Burner for a heater with improved heat shield | |
| US20130252185A1 (en) | Igniter air shield | |
| CA2601319A1 (en) | Burner for a heating device with improved fuel supply | |
| US5934898A (en) | Burner nozzle with improved flame stability | |
| JP5525855B2 (en) | Combustion device | |
| KR100242970B1 (en) | Premixed burner of gas boiler | |
| GB2287311A (en) | Flame stabilization in premixing burners | |
| JP2006514254A (en) | Nozzle for spraying liquid fuel | |
| JPS6021607Y2 (en) | Premix combustion burner | |
| JP2023106203A (en) | burner | |
| JPH08583Y2 (en) | Combustor | |
| JPH06103084B2 (en) | Radiant gas burner | |
| JP2001248808A (en) | Combustion equipment | |
| JPH08312901A (en) | Smoke tube boiler equipped with burner in group of smoke tubes | |
| JPH0477204B2 (en) | ||
| JPH076612B2 (en) | Burner | |
| JPH01305209A (en) | Burner | |
| JP2000337607A (en) | Combustion device | |
| JPH0297809A (en) | Burner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |